//go:build windows

package main

import (
	"encoding/json"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"regexp"
	"runtime"
	"runtime/debug"
	"sort"
	"strconv"
	"strings"
	"sync"
	"syscall"
	"time"
	"unsafe"

	appPkg "vrc_osc_go/internal/app"
	"vrc_osc_go/internal/config"
)

const (
	wsOverlappedWindow    = 0x00CF0000
	wsVisible             = 0x10000000
	wsChild               = 0x40000000
	wsPopup               = 0x80000000
	wsClipChildren        = 0x02000000
	wsClipSiblings        = 0x04000000
	wsBorder              = 0x00800000
	wsVScroll             = 0x00200000
	esMultiline           = 0x0004
	esReadonly            = 0x0800
	esAutovscroll         = 0x0040
	esAutohscroll         = 0x0080
	wsTabstop             = 0x00010000
	wmCreateGUI           = 0x0001
	wmDestroyGUI          = 0x0002
	wmPaint               = 0x000F
	wmEraseBkgnd          = 0x0014
	wmSize                = 0x0005
	wmVScroll             = 0x0115
	wmMouseWheel          = 0x020A
	wmCloseGUI            = 0x0010
	wmLButtonDown         = 0x0201
	wmLButtonUpGUI        = 0x0202
	wmChar                = 0x0102
	wmNCLButtonDown       = 0x00A1
	wmTimerGUI            = 0x0113
	wmCommandGUI          = 0x0111
	wmSetFont             = 0x0030
	wmHistoryExportDone   = 0x0401
	wmHistoryRefreshDone  = 0x0402
	enChange              = 0x0300
	enKillFocus           = 0x0200
	bnClicked             = 0x0000
	htCaption             = 2
	tbButtonStructSize    = 0x041E
	tbAddButtons          = 0x0414
	tbAddStringW          = 0x044D
	tbAutoSize            = 0x0421
	tbSetButtonSize       = 0x041F
	tbSetExtendedStyle    = 0x0454
	tbSetMaxTextRows      = 0x0428
	tbstyleFlat           = 0x0800
	tbstyleList           = 0x1000
	tbstyleExMixedBtns    = 0x00000008
	btNsButton            = 0x0000
	btNsAutoSize          = 0x0010
	btNsNoPrefix          = 0x0020
	btNsShowText          = 0x0040
	tbstateEnabled        = 0x04
	ccsTop                = 0x00000001
	ccsNoResize           = 0x00000004
	ccsNoParentAlign      = 0x00000008
	ccsNoDivider          = 0x00000040
	iccBarClasses         = 0x00000004
	toolbarClass          = "ToolbarWindow32"
	editClass             = "EDIT"
	paneClass             = "VRC_OSC_PANE"
	idStatus              = 2001
	idLog                 = 2002
	idHistoryExportDir    = 3010
	idHistoryExportCustom = 3011
	idHistoryExportBrowse = 3012
	idHistoryExportSave   = 3013
	bifReturnOnlyFsDirs   = 0x0001
	bifEditBox            = 0x0010
	bifNewDialogStyle     = 0x0040
	bffmInitialized       = 1
	bffmSetSelectionW     = 0x0467
	timerRefresh          = 1
	headerHeight          = 56
	navBarHeight          = 58
	contentTop            = headerHeight + navBarHeight
	bottomBarHeight       = 48
	windowWidth           = 760
	leftPaneWidth         = 445
	leftPaneHeight        = 560
	rightPaneWidth        = windowWidth - leftPaneWidth
	settingsPaneWidth     = rightPaneWidth
	settingsPaneHeight    = leftPaneHeight
	clrMainBg             = 0x00311c0b
	clrHeaderBg           = 0x004d2c08
	clrNavBg              = 0x0024150b
	clrNavActiveBg        = 0x00311f12
	clrPaneBg             = 0x00372513
	clrPaneBgAlt          = 0x00332110
	clrPaneBorder         = 0x005b3500
	clrText               = 0x00e8edf8
	clrMutedText          = 0x007d8aa0
	clrAccentGreen        = 0x0067e244
	clrAccentRed          = 0x006165ff
	clrAccentBlue         = 0x00ff9c1f
	clrAvatarBg           = 0x005a3900
	guiLogTailBytes       = 2 * 1024 * 1024
)

const translateTabEnabled = false

const (
	defaultGUIFontSize = 14
	minGUIFontSize     = 8
	maxGUIFontSize     = 30
)

var joinLeaveLinePattern = regexp.MustCompile(`^\[(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})\]\s+\[(join|leave)\]\s+(.+?)\s+\((\d+)\)$`)
var runtimeTimePattern = regexp.MustCompile(`^\[(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})\]`)
var worldIdPattern = regexp.MustCompile(`worldId=(wrld_[0-9a-fA-F-]+)`)
var instanceIdPattern = regexp.MustCompile(`instanceId=([^,}\s]+)`)
var worldNamePattern = regexp.MustCompile(`worldName=([^,}]+)`)
var worldLocationPattern = regexp.MustCompile(`worldId=(wrld_[0-9a-fA-F-]+):([^\s,\]\)\"']+)`)
var worldPattern = regexp.MustCompile(`(wrld_[0-9a-fA-F-]+(?::[^\s\]\)\"']+)?)`)
var enteringRoomPattern = regexp.MustCompile(`\[Behaviour\]\s+(?:Entering Room|Joining or Creating Room):\s+(.+)$`)
var vrcLogTimePattern = regexp.MustCompile(`^(\d{4}\.\d{2}\.\d{2} \d{2}:\d{2}:\d{2})`)
var vrcJoinPattern = regexp.MustCompile(`OnPlayerJoined\s+(.+?)\s+\(usr_[0-9a-fA-F-]+\)`)
var vrcLeftPattern = regexp.MustCompile(`OnPlayerLeft\s+(.+?)\s+\(usr_[0-9a-fA-F-]+\)`)
var joinLeaveBodyPattern = regexp.MustCompile(`^\[(join|leave)\]\s+(.+?)\s+\((\d+)\)$`)
var hwndTopMostFlag uintptr = ^uintptr(0)
var hwndNotTopMostFlag uintptr = ^uintptr(0) - 1
var hwndNoMove uintptr = 0x0002
var hwndNoZOrder uintptr = 0x0004
var hwndNoSize uintptr = 0x0001
var hwndNoActivate uintptr = 0x0010
var hwndShowWindow uintptr = 0x0040
var swMinimize uintptr = 6
var swRestore uintptr = 9
var swHideControl uintptr = 0
var swShowControl uintptr = 5
var swpVisibleFlags uintptr = hwndNoActivate | hwndShowWindow
var swpFlags uintptr = hwndNoMove | hwndNoSize | hwndNoActivate
var swpShowFlags uintptr = hwndNoMove | hwndNoSize | hwndShowWindow
var smXVirtualScreen int32 = 76
var smYVirtualScreen int32 = 77
var smCXVirtualScreen int32 = 78
var smCYVirtualScreen int32 = 79
var setWindowPosProc *syscall.LazyProc
var sendMessageProc *syscall.LazyProc
var postMessageProc *syscall.LazyProc
var shellExecuteProc *syscall.LazyProc
var createFontProc *syscall.LazyProc
var deleteObjectProc *syscall.LazyProc
var getStockObjectProc *syscall.LazyProc
var showWindowProc *syscall.LazyProc
var initCommonControlsExProc *syscall.LazyProc
var createSolidBrushProc *syscall.LazyProc
var getSystemMetricsProc *syscall.LazyProc
var beginPaintProc *syscall.LazyProc
var endPaintProc *syscall.LazyProc
var getClientRectProc *syscall.LazyProc
var fillRectProc *syscall.LazyProc
var getSysColorBrushProc *syscall.LazyProc
var selectObjectProc *syscall.LazyProc
var setBkModeProc *syscall.LazyProc
var setTextColorProc *syscall.LazyProc
var textOutProc *syscall.LazyProc
var getTextExtentPoint32Proc *syscall.LazyProc
var getTextMetricsProc *syscall.LazyProc
var invalidateRectProc *syscall.LazyProc
var setScrollInfoProc *syscall.LazyProc
var getScrollInfoProc *syscall.LazyProc
var setTimerProc *syscall.LazyProc
var createPenProc *syscall.LazyProc
var moveToExProc *syscall.LazyProc
var lineToProc *syscall.LazyProc
var ellipseProc *syscall.LazyProc
var mainBgBrush uintptr
var paneBgBrush uintptr
var navBgBrush uintptr
var navActiveBrush uintptr
var paneAltBrush uintptr
var defaultGUIFont uintptr
var vrchatRunningMu sync.Mutex
var vrchatRunningLastCheck time.Time
var vrchatRunningLastValue bool
var guestSnapshotCacheMu sync.Mutex
var guestSnapshotCache struct {
	modTime time.Time
	size    int64
	items   []appPkg.GuestStatus
}
var worldHistoryCacheMu sync.Mutex
var worldHistoryCache struct {
	modTime time.Time
	size    int64
	items   []guiWorldVisitRecord
}
var joinLeaveEventsCacheMu sync.Mutex
var joinLeaveEventsCache struct {
	jsonMod  time.Time
	jsonSize int64
	logMod   time.Time
	logSize  int64
	items    []joinLeaveEventSnapshot
}

type guiApp struct {
	hwnd                          uintptr
	navBarHwnd                    uintptr
	leftHwnd                      uintptr
	rightHwnd                     uintptr
	settingsPaneHwnd              uintptr
	tabJoin                       uintptr
	tabTranslate                  uintptr
	tabSettings                   uintptr
	btnTopMost                    uintptr
	btnAutoUnmute                 uintptr
	btnFontDown                   uintptr
	btnFontUp                     uintptr
	activeTab                     string
	topMost                       bool
	autoUnmuteOnLeave             bool
	lastTopMost                   bool
	fontSize                      int
	hFont                         uintptr
	joinFontSize                  int
	joinHFont                     uintptr
	joinBoldFontSize              int
	joinBoldHFont                 uintptr
	joinHeadlineSize              int
	joinHeadlineHFont             uintptr
	leftPaneText                  string
	rightPaneText                 string
	refreshIntervalValue          int
	refreshIntervalUnit           string
	historyRegex                  string
	historyFromDate               string
	historyToDate                 string
	historyMonth                  time.Time
	historySelectedDate           time.Time
	historySelectedKeys           map[string]bool
	historyStatus                 string
	historyCalendarCells          []historyCalendarCell
	historyDetailRows             []historyDetailRow
	historyPrevMonthRect          winRect
	historyNextMonthRect          winRect
	historyReloadRect             winRect
	historyExportRect             winRect
	historyReloadPending          bool
	historyRefreshRunning         bool
	historyRefreshResultCh        chan historyRefreshResult
	historyCacheLoaded            bool
	historyDetailContentHeightPx  int32
	settingsExportDirEdit         uintptr
	settingsExportBrowseBtn       uintptr
	settingsExportCustomEdit      uintptr
	settingsExportCustomSaveBtn   uintptr
	settingsEditSyncing           bool
	historyExportDir              string
	historyExportIncludeTime      bool
	historyExportIncludeWorld     bool
	historyExportIncludeJoinLeave bool
	historyExportCustomEnabled    bool
	historyExportCustom           string
	historyExportRunning          bool
	historyExportResultCh         chan historyExportResult
	lastSettingsVisible           bool
	discordMuted                  bool
	currentUsers                  []userState
	currentWorld                  string
	currentUserCount              int
	historyRows                   []guiWorldVisitRow
	memberScrollPos               int
	eventScrollPos                int
	historyScrollPos              int
	lastSettingsAction            time.Time
	lastTabAction                 time.Time
	lastInstanceCount             int
	lastLayoutHeight              int
}

type userState struct {
	Name      string
	Present   bool
	LastJoin  time.Time
	LastLeave time.Time
}

func runtimeDir() string {
	exe, err := os.Executable()
	if err != nil {
		return "runtime"
	}
	return filepath.Join(filepath.Dir(exe), "runtime")
}

type initCommonControlsEx struct {
	dwSize uint32
	dwICC  uint32
}

type toolbarButton struct {
	iBitmap   int32
	idCommand int32
	fsState   byte
	fsStyle   byte
	bReserved [2]byte
	dwData    uintptr
	iString   uintptr
}

type worldState struct {
	location         string
	worldID          string
	instanceID       string
	worldName        string
	pendingWorldName string
	initialized      bool
}

func guiLog(text string) {
	_ = appPkg.AppendRuntimeLog("GUI", text)
}

func runNativeGUI(initialTab string) error {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()

	user32 := syscall.NewLazyDLL("user32.dll")
	kernel32 := syscall.NewLazyDLL("kernel32.dll")
	gdi32 := syscall.NewLazyDLL("gdi32.dll")
	comctl32 := syscall.NewLazyDLL("comctl32.dll")
	shell32 := syscall.NewLazyDLL("shell32.dll")
	registerClass := user32.NewProc("RegisterClassW")
	createWindowEx := user32.NewProc("CreateWindowExW")
	defWindowProc := user32.NewProc("DefWindowProcW")
	showWindowProc = user32.NewProc("ShowWindow")
	setWindowPosProc = user32.NewProc("SetWindowPos")
	sendMessageProc = user32.NewProc("SendMessageW")
	createFontProc = gdi32.NewProc("CreateFontW")
	deleteObjectProc = gdi32.NewProc("DeleteObject")
	getStockObjectProc = gdi32.NewProc("GetStockObject")
	initCommonControlsExProc = comctl32.NewProc("InitCommonControlsEx")
	createSolidBrushProc = gdi32.NewProc("CreateSolidBrush")
	getSystemMetricsProc = user32.NewProc("GetSystemMetrics")
	beginPaintProc = user32.NewProc("BeginPaint")
	endPaintProc = user32.NewProc("EndPaint")
	getClientRectProc = user32.NewProc("GetClientRect")
	fillRectProc = user32.NewProc("FillRect")
	getSysColorBrushProc = user32.NewProc("GetSysColorBrush")
	selectObjectProc = gdi32.NewProc("SelectObject")
	setBkModeProc = gdi32.NewProc("SetBkMode")
	setTextColorProc = gdi32.NewProc("SetTextColor")
	textOutProc = gdi32.NewProc("TextOutW")
	getTextExtentPoint32Proc = gdi32.NewProc("GetTextExtentPoint32W")
	getTextMetricsProc = gdi32.NewProc("GetTextMetricsW")
	invalidateRectProc = user32.NewProc("InvalidateRect")
	setScrollInfoProc = user32.NewProc("SetScrollInfo")
	getScrollInfoProc = user32.NewProc("GetScrollInfo")
	createPenProc = gdi32.NewProc("CreatePen")
	moveToExProc = gdi32.NewProc("MoveToEx")
	lineToProc = gdi32.NewProc("LineTo")
	ellipseProc = gdi32.NewProc("Ellipse")
	if getStockObjectProc != nil {
		defaultGUIFont, _, _ = getStockObjectProc.Call(17)
	}
	getMessage := user32.NewProc("GetMessageW")
	translateMessage := user32.NewProc("TranslateMessage")
	dispatchMessage := user32.NewProc("DispatchMessageW")
	postQuitMessage := user32.NewProc("PostQuitMessage")
	postMessageProc = user32.NewProc("PostMessageW")
	releaseCapture := user32.NewProc("ReleaseCapture")
	setTimerProc = user32.NewProc("SetTimer")
	loadCursor := user32.NewProc("LoadCursorW")
	setWindowText := user32.NewProc("SetWindowTextW")
	getWindowText := user32.NewProc("GetWindowTextW")
	getWindowRect := user32.NewProc("GetWindowRect")
	isWindowVisible := user32.NewProc("IsWindowVisible")
	isIconic := user32.NewProc("IsIconic")
	getModuleHandle := kernel32.NewProc("GetModuleHandleW")
	loadImage := user32.NewProc("LoadImageW")
	setActiveWindow := user32.NewProc("SetActiveWindow")
	setForegroundWindow := user32.NewProc("SetForegroundWindow")
	bringWindowToTop := user32.NewProc("BringWindowToTop")
	shellExecuteProc = shell32.NewProc("ShellExecuteW")

	type wndClass struct {
		style         uint32
		lpfnWndProc   uintptr
		cbClsExtra    int32
		cbWndExtra    int32
		hInstance     uintptr
		hIcon         uintptr
		hCursor       uintptr
		hbrBackground uintptr
		lpszMenuName  *uint16
		lpszClassName *uint16
	}
	type msg struct {
		hwnd    uintptr
		message uint32
		wParam  uintptr
		lParam  uintptr
		time    uint32
		pt      struct{ X, Y int32 }
	}

	hInstance, _, _ := getModuleHandle.Call(0)
	if createSolidBrushProc != nil {
		mainBgBrush, _, _ = createSolidBrushProc.Call(clrMainBg)
		paneBgBrush, _, _ = createSolidBrushProc.Call(clrPaneBg)
		navBgBrush, _, _ = createSolidBrushProc.Call(clrNavBg)
		navActiveBrush, _, _ = createSolidBrushProc.Call(clrNavActiveBg)
		paneAltBrush, _, _ = createSolidBrushProc.Call(clrPaneBgAlt)
	}
	className, _ := syscall.UTF16PtrFromString("VRC_OSC_NATIVE_GUI")
	paneClassName, _ := syscall.UTF16PtrFromString(paneClass)
	title, _ := syscall.UTF16PtrFromString("VRC OSC")
	cursor, _, _ := loadCursor.Call(0, 32512)
	iconPath := trayIconPath()
	iconPathPtr, _ := syscall.UTF16PtrFromString(iconPath)
	const (
		lrLoadFromFile = 0x00000010
		imageIcon      = 1
	)
	icon, _, _ := loadImage.Call(0, uintptr(unsafe.Pointer(iconPathPtr)), imageIcon, 0, 0, lrLoadFromFile)
	if icon == 0 {
		icon, _, _ = user32.NewProc("LoadIconW").Call(0, 32512)
	}
	guiLog("stage=prepare window")

	var app guiApp
	app.activeTab = normalizeInitialTab(initialTab)
	if app.activeTab == "" {
		app.activeTab = "join"
	}
	if app.activeTab == "translate" && !translateTabEnabled {
		app.activeTab = "join"
	}
	guiCfg := loadGUISettings()
	app.topMost = guiCfg.TopMost
	app.autoUnmuteOnLeave = guiCfg.AutoUnmuteOnSelfLeave
	if guiCfg.FontSize > 0 {
		app.fontSize = guiCfg.FontSize
	} else {
		app.fontSize = defaultGUIFontSize
	}
	app.refreshIntervalValue = guiCfg.RefreshIntervalValue
	if app.refreshIntervalValue <= 0 {
		app.refreshIntervalValue = 2
	}
	app.refreshIntervalUnit = strings.ToLower(strings.TrimSpace(guiCfg.RefreshIntervalUnit))
	if app.refreshIntervalUnit != "min" {
		app.refreshIntervalUnit = "sec"
	}
	app.historyRegex = strings.TrimSpace(guiCfg.HistoryRegex)
	app.historyFromDate = strings.TrimSpace(guiCfg.HistoryFromDate)
	app.historyToDate = strings.TrimSpace(guiCfg.HistoryToDate)
	app.historyExportDir = strings.TrimSpace(guiCfg.HistoryExportDir)
	if app.historyExportDir == "" {
		app.historyExportDir = filepath.Join(runtimeDir(), "exports")
	}
	app.historyExportIncludeTime = guiCfg.HistoryExportIncludeTime
	app.historyExportIncludeWorld = guiCfg.HistoryExportIncludeWorld
	app.historyExportIncludeJoinLeave = guiCfg.HistoryExportIncludeJoinLeave
	app.historyExportCustomEnabled = guiCfg.HistoryExportCustomEnabled
	app.historyExportCustom = strings.TrimSpace(guiCfg.HistoryExportCustom)
	app.historyReloadPending = true
	app.hFont = createAppFont(app.fontSize)
	paneWndProc := syscall.NewCallback(func(hwnd uintptr, message uint32, wParam, lParam uintptr) uintptr {
		defer func() {
			if r := recover(); r != nil {
				guiLog(fmt.Sprintf("panic in paneWndProc hwnd=%d msg=0x%04x: %v\n%s", hwnd, message, r, debug.Stack()))
			}
		}()
		switch message {
		case wmPaint:
			switch hwnd {
			case app.leftHwnd:
				return paintLeftPane(hwnd, &app)
			case app.rightHwnd:
				return paintRightPane(hwnd, &app)
			case app.settingsPaneHwnd:
				return paintSettingsPane(hwnd, &app)
			default:
				return paintJoinPane(hwnd, &app)
			}
		case wmEraseBkgnd:
			return paintPaneBackground(hwnd, &app, wParam)
		case wmSize:
			if invalidateRectProc != nil {
				invalidateRectProc.Call(hwnd, 0, 1)
			}
			return 0
		case wmVScroll:
			if handlePaneVScroll(hwnd, &app, wParam) {
				return 0
			}
		case wmMouseWheel:
			if handlePaneMouseWheel(hwnd, &app, int32(int16(wParam>>16))) {
				return 0
			}
		case wmCommandGUI:
			if hwnd == app.settingsPaneHwnd {
				cmd := uint16(wParam & 0xffff)
				notify := uint16((wParam >> 16) & 0xffff)
				if cmd == idHistoryExportBrowse && notify == bnClicked {
					if handleHistoryExportBrowseCommand(&app, setWindowText) {
						return 0
					}
				}
				if cmd == idHistoryExportSave && notify == bnClicked {
					if handleHistoryExportSaveCommand(&app, getWindowText, setWindowText) {
						return 0
					}
				}
				if notify == enChange || notify == enKillFocus {
					if handleHistoryExportEditCommand(&app, cmd, notify, getWindowText, setWindowText) {
						return 0
					}
				}
			}
		case wmLButtonUpGUI:
			if (hwnd == app.settingsPaneHwnd || hwnd == app.leftHwnd) && app.activeTab == "settings" {
				if handleSettingsPaneClick(&app, int32(lParam&0xffff), int32((lParam>>16)&0xffff), getWindowText, setWindowText) {
					return 0
				}
			}
			if app.activeTab == "history" {
				if hwnd == app.leftHwnd || hwnd == app.rightHwnd {
					if handleHistoryPaneClick(&app, hwnd, int32(lParam&0xffff), int32((lParam>>16)&0xffff), getWindowText, setWindowText) {
						return 0
					}
				}
			}
		}
		if defWindowProc != nil {
			ret, _, _ := defWindowProc.Call(hwnd, uintptr(message), wParam, lParam)
			return ret
		}
		return 0
	})
	guiLog("stage=register pane class")
	atomPane, _, regPaneErr := registerClass.Call(uintptr(unsafe.Pointer(&wndClass{
		style:         0,
		lpfnWndProc:   paneWndProc,
		hInstance:     hInstance,
		hIcon:         0,
		hCursor:       cursor,
		hbrBackground: mainBgBrush,
		lpszClassName: paneClassName,
	})))
	if atomPane == 0 {
		guiLog(fmt.Sprintf("stage=register pane class failed err=%v", regPaneErr))
		return fmt.Errorf("register pane class: %v", regPaneErr)
	}
	wndProc := syscall.NewCallback(func(hwnd uintptr, message uint32, wParam, lParam uintptr) uintptr {
		defer func() {
			if r := recover(); r != nil {
				guiLog(fmt.Sprintf("panic in wndProc hwnd=%d msg=0x%04x: %v\n%s", hwnd, message, r, debug.Stack()))
			}
		}()
		switch message {
		case wmPaint:
			return paintMainWindow(hwnd, &app)
		case wmEraseBkgnd:
			return 1
		case wmCreateGUI:
			app.hwnd = hwnd
			buttonClass, _ := syscall.UTF16PtrFromString("BUTTON")
			editClassTitle, _ := syscall.UTF16PtrFromString(editClass)
			leftTitle, _ := syscall.UTF16PtrFromString("")
			rightTitle, _ := syscall.UTF16PtrFromString("")
			topMostTitle, _ := syscall.UTF16PtrFromString("Top most")
			autoUnmuteTitle, _ := syscall.UTF16PtrFromString("Leave unmute")
			fontDownTitle, _ := syscall.UTF16PtrFromString("A-")
			fontUpTitle, _ := syscall.UTF16PtrFromString("A+")
			browseTitle, _ := syscall.UTF16PtrFromString("参照")
			saveTitle, _ := syscall.UTF16PtrFromString("保存")
			toolbarTitle, _ := syscall.UTF16PtrFromString("")
			if initCommonControlsExProc != nil {
				icc := initCommonControlsEx{
					dwSize: uint32(unsafe.Sizeof(initCommonControlsEx{})),
					dwICC:  iccBarClasses,
				}
				initCommonControlsExProc.Call(uintptr(unsafe.Pointer(&icc)))
			}
			app.navBarHwnd, _, _ = createWindowEx.Call(
				0,
				uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(toolbarClass))),
				uintptr(unsafe.Pointer(toolbarTitle)),
				wsChild|wsClipChildren|wsBorder|tbstyleList|ccsNoResize|ccsNoParentAlign|ccsNoDivider,
				0, headerHeight, windowWidth, navBarHeight, hwnd, 3000, hInstance, 0,
			)
			if app.navBarHwnd != 0 && sendMessageProc != nil {
				sendMessageProc.Call(app.navBarHwnd, tbButtonStructSize, uintptr(unsafe.Sizeof(toolbarButton{})), 0)
				sendMessageProc.Call(app.navBarHwnd, tbSetButtonSize, 0, uintptr(120)|(uintptr(24)<<16))
				sendMessageProc.Call(app.navBarHwnd, tbSetExtendedStyle, 0, tbstyleExMixedBtns)
				toolbarStrings := []uint16{
					'\u30ed', '\u30b0', 0,
					'\u7ffb', '\u8a33', 0,
					'\u8a2d', '\u5b9a', 0,
					'\u5c65', '\u6b74', 0,
					0,
				}
				baseStringIndex, _, _ := sendMessageProc.Call(app.navBarHwnd, tbAddStringW, 0, uintptr(unsafe.Pointer(&toolbarStrings[0])))
				buttons := []toolbarButton{
					{iBitmap: -2, idCommand: 3001, fsState: tbstateEnabled, fsStyle: btNsButton | btNsAutoSize | btNsNoPrefix | btNsShowText, iString: baseStringIndex},
					{iBitmap: -2, idCommand: 3002, fsState: 0, fsStyle: btNsButton | btNsAutoSize | btNsNoPrefix | btNsShowText, iString: baseStringIndex + 1},
					{iBitmap: -2, idCommand: 3003, fsState: tbstateEnabled, fsStyle: btNsButton | btNsAutoSize | btNsNoPrefix | btNsShowText, iString: baseStringIndex + 2},
					{iBitmap: -2, idCommand: 3004, fsState: tbstateEnabled, fsStyle: btNsButton | btNsAutoSize | btNsNoPrefix | btNsShowText, iString: baseStringIndex + 3},
				}
				sendMessageProc.Call(app.navBarHwnd, tbAddButtons, uintptr(len(buttons)), uintptr(unsafe.Pointer(&buttons[0])))
				sendMessageProc.Call(app.navBarHwnd, tbSetMaxTextRows, 1, 0)
				sendMessageProc.Call(app.navBarHwnd, tbAutoSize, 0, 0)
			}
			paneStyle := uintptr(wsVisible | wsChild | wsClipChildren | wsClipSiblings | wsVScroll)
			buttonStyle := uintptr(wsChild | wsClipSiblings)
			app.leftHwnd, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(paneClassName)), uintptr(unsafe.Pointer(leftTitle)), paneStyle, 0, contentTop, leftPaneWidth, leftPaneHeight, hwnd, idStatus, hInstance, 0)
			app.rightHwnd, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(paneClassName)), uintptr(unsafe.Pointer(rightTitle)), paneStyle, leftPaneWidth, contentTop, rightPaneWidth, leftPaneHeight, hwnd, idLog, hInstance, 0)
			settingsPaneTitle, _ := syscall.UTF16PtrFromString("")
			app.settingsPaneHwnd, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(paneClassName)), uintptr(unsafe.Pointer(settingsPaneTitle)), paneStyle, 0, contentTop, windowWidth, settingsPaneHeight, hwnd, idLog+1, hInstance, 0)
			app.btnTopMost, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(buttonClass)), uintptr(unsafe.Pointer(topMostTitle)), buttonStyle, leftPaneWidth+32, contentTop+86, 140, 30, hwnd, 3005, hInstance, 0)
			app.btnAutoUnmute, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(buttonClass)), uintptr(unsafe.Pointer(autoUnmuteTitle)), buttonStyle, leftPaneWidth+32, contentTop+132, 180, 30, hwnd, 3008, hInstance, 0)
			app.btnFontDown, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(buttonClass)), uintptr(unsafe.Pointer(fontDownTitle)), buttonStyle, leftPaneWidth+32, contentTop+178, 52, 30, hwnd, 3006, hInstance, 0)
			app.btnFontUp, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(buttonClass)), uintptr(unsafe.Pointer(fontUpTitle)), buttonStyle, leftPaneWidth+92, contentTop+178, 52, 30, hwnd, 3007, hInstance, 0)
			exportDirTitle, _ := syscall.UTF16PtrFromString("")
			exportDirRect := settingsHistoryExportDirRect()
			app.settingsExportDirEdit, _, _ = createWindowEx.Call(
				0,
				uintptr(unsafe.Pointer(editClassTitle)),
				uintptr(unsafe.Pointer(exportDirTitle)),
				uintptr(wsChild|wsVisible|wsBorder|wsTabstop|esAutohscroll),
				uintptr(exportDirRect.Left), uintptr(exportDirRect.Top), uintptr(exportDirRect.Right-exportDirRect.Left), uintptr(exportDirRect.Bottom-exportDirRect.Top),
				app.settingsPaneHwnd, idHistoryExportDir, hInstance, 0,
			)
			browseStyle := uintptr(wsChild | wsTabstop)
			browseRect := settingsHistoryExportBrowseRect()
			app.settingsExportBrowseBtn, _, _ = createWindowEx.Call(
				0,
				uintptr(unsafe.Pointer(buttonClass)),
				uintptr(unsafe.Pointer(browseTitle)),
				browseStyle,
				uintptr(browseRect.Left), uintptr(browseRect.Top), uintptr(browseRect.Right-browseRect.Left), uintptr(browseRect.Bottom-browseRect.Top),
				app.settingsPaneHwnd, idHistoryExportBrowse, hInstance, 0,
			)
			exportCustomTitle, _ := syscall.UTF16PtrFromString("")
			customRect := settingsHistoryExportCustomRect()
			app.settingsExportCustomEdit, _, _ = createWindowEx.Call(
				0,
				uintptr(unsafe.Pointer(editClassTitle)),
				uintptr(unsafe.Pointer(exportCustomTitle)),
				uintptr(wsChild|wsVisible|wsBorder|wsTabstop|esAutohscroll),
				uintptr(customRect.Left), uintptr(customRect.Top), uintptr(customRect.Right-customRect.Left), uintptr(customRect.Bottom-customRect.Top),
				app.settingsPaneHwnd, idHistoryExportCustom, hInstance, 0,
			)
			saveRect := settingsHistoryExportCustomSaveRect()
			app.settingsExportCustomSaveBtn, _, _ = createWindowEx.Call(
				0,
				uintptr(unsafe.Pointer(buttonClass)),
				uintptr(unsafe.Pointer(saveTitle)),
				browseStyle,
				uintptr(saveRect.Left), uintptr(saveRect.Top), uintptr(saveRect.Right-saveRect.Left), uintptr(saveRect.Bottom-saveRect.Top),
				app.settingsPaneHwnd, idHistoryExportSave, hInstance, 0,
			)
			applyRefreshTimer(hwnd, &app)
			applyFont(&app)
			syncHistoryExportEditControls(&app, setWindowText)
			refreshGUI(setWindowText, &app, true)
			applyTopMost(hwnd, &app)
			ensureWindowVisible("startup", hwnd, showWindowProc, setWindowPosProc, getWindowRect, isWindowVisible, isIconic, getSystemMetricsProc)
			raiseWindowToFront(hwnd, showWindowProc, setWindowPosProc, setActiveWindow, setForegroundWindow, bringWindowToTop)
			logWindowState("after-ensure", hwnd, getWindowRect, isWindowVisible, isIconic)
			return 0
		case wmCommandGUI:
			needsFullRefresh := false
			switch uint16(wParam & 0xffff) {
			case 3001:
				guiLog("click tab command join")
				app.activeTab = "join"
				needsFullRefresh = true
			case 3002:
				guiLog("click tab command translate")
				if translateTabEnabled {
					app.activeTab = "translate"
					needsFullRefresh = true
				} else {
					guiLog("translate tab disabled")
					return 0
				}
			case 3003:
				guiLog("click tab command settings")
				app.activeTab = "settings"
				needsFullRefresh = true
			case 3004:
				guiLog("click tab command history")
				app.activeTab = "history"
				app.lastSettingsVisible = false
				if !app.historyCacheLoaded {
					requestHistoryRefresh(&app, "reloading...")
				}
				syncPaneVisibility(&app)
				refreshCommandUI(setWindowText, &app)
				refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
				if invalidateRectProc != nil {
					if app.leftHwnd != 0 {
						invalidateRectProc.Call(app.leftHwnd, 0, 1)
					}
					if app.rightHwnd != 0 {
						invalidateRectProc.Call(app.rightHwnd, 0, 1)
					}
					if app.hwnd != 0 {
						invalidateRectProc.Call(app.hwnd, 0, 1)
					}
				}
				return 0
			case 3005:
				guiLog("click settings command topmost")
				if !allowRapidSettingsAction(&app) {
					return 0
				}
				app.topMost = !app.topMost
				saveGUISettings(&app)
				applyTopMost(hwnd, &app)
			case 3008:
				guiLog("click settings command leave_unmute")
				if !allowRapidSettingsAction(&app) {
					return 0
				}
				app.autoUnmuteOnLeave = !app.autoUnmuteOnLeave
				saveGUISettings(&app)
			case 3012:
				guiLog("click settings command export_browse")
				if handleHistoryExportBrowseCommand(&app, setWindowText) {
					refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
					return 0
				}
			case 3013:
				guiLog("click settings command export_save")
				if handleHistoryExportSaveCommand(&app, getWindowText, setWindowText) {
					refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
					return 0
				}
			case 3006:
				guiLog("click settings command font_down")
				if !allowRapidSettingsAction(&app) {
					return 0
				}
				if app.fontSize > minGUIFontSize {
					app.fontSize -= 2
					if app.fontSize < minGUIFontSize {
						app.fontSize = minGUIFontSize
					}
					oldFont := app.hFont
					app.hFont = createAppFont(app.fontSize)
					applyFont(&app)
					if oldFont != 0 && deleteObjectProc != nil {
						deleteObjectProc.Call(oldFont)
					}
					saveGUISettings(&app)
				}
			case 3007:
				guiLog("click settings command font_up")
				if !allowRapidSettingsAction(&app) {
					return 0
				}
				if app.fontSize < maxGUIFontSize {
					app.fontSize += 2
					if app.fontSize > maxGUIFontSize {
						app.fontSize = maxGUIFontSize
					}
					oldFont := app.hFont
					app.hFont = createAppFont(app.fontSize)
					applyFont(&app)
					if oldFont != 0 && deleteObjectProc != nil {
						deleteObjectProc.Call(oldFont)
					}
					saveGUISettings(&app)
				}
			}
			if needsFullRefresh {
				refreshGUI(setWindowText, &app, false)
				refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
			} else {
				refreshCommandUI(setWindowText, &app)
				refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
			}
			return 0
		case wmLButtonDown:
			x := int32(lParam & 0xffff)
			y := int32((lParam >> 16) & 0xffff)
			if y >= 0 && y < headerHeight {
				var rc winRect
				width := int32(windowWidth)
				if getClientRectProc != nil {
					getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
					if rc.Right > 0 {
						width = rc.Right
					}
				}
				switch {
				case pointInHeaderDot(x, y, width-92, 22):
					guiLog("window control minimize")
					if showWindowProc != nil {
						showWindowProc.Call(hwnd, swMinimize)
					}
					return 0
				case pointInHeaderDot(x, y, width-62, 22):
					guiLog("window control topmost toggle")
					app.topMost = !app.topMost
					saveGUISettings(&app)
					applyTopMost(hwnd, &app)
					if invalidateRectProc != nil {
						invalidateRectProc.Call(hwnd, 0, 1)
					}
					return 0
				case pointInHeaderDot(x, y, width-32, 22):
					guiLog("window control close")
					postQuitMessage.Call(0)
					return 0
				}
				releaseCapture.Call()
				sendMessageProc.Call(hwnd, wmNCLButtonDown, htCaption, 0)
				return 0
			}
		case wmLButtonUpGUI:
			x := int32(lParam & 0xffff)
			y := int32((lParam >> 16) & 0xffff)
			if y >= headerHeight && y < contentTop {
				nextTab := app.activeTab
				switch {
				case x < 120:
					nextTab = "join"
				case x < 240:
					nextTab = "history"
				case x < 360:
					if translateTabEnabled {
						nextTab = "translate"
					}
				case x < 480:
					nextTab = "settings"
				}
				guiLog(fmt.Sprintf("click tab area x=%d y=%d active=%s next=%s", x, y, app.activeTab, nextTab))
				if nextTab == app.activeTab {
					return 0
				}
				if !allowRapidTabAction(&app) {
					return 0
				}
				app.activeTab = nextTab
				if nextTab == "history" {
					app.lastSettingsVisible = false
					if !app.historyCacheLoaded {
						requestHistoryRefresh(&app, "reloading...")
					}
					syncPaneVisibility(&app)
					refreshCommandUI(setWindowText, &app)
					refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
					if invalidateRectProc != nil {
						if app.leftHwnd != 0 {
							invalidateRectProc.Call(app.leftHwnd, 0, 1)
						}
						if app.rightHwnd != 0 {
							invalidateRectProc.Call(app.rightHwnd, 0, 1)
						}
						if app.hwnd != 0 {
							invalidateRectProc.Call(app.hwnd, 0, 1)
						}
					}
					return 0
				}
				refreshGUI(setWindowText, &app, false)
				refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
				if invalidateRectProc != nil {
					invalidateRectProc.Call(hwnd, 0, 1)
				}
				return 0
			}
		case wmTimerGUI:
			drainHistoryExportResult(&app)
			drainHistoryRefreshResult(&app)
			reloadData := app.activeTab == "join" || app.activeTab == "translate"
			if app.activeTab == "history" && app.historyReloadPending {
				startHistoryRefresh(&app, true)
				refreshGUI(setWindowText, &app, false)
				refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
				return 0
			}
			refreshGUI(setWindowText, &app, reloadData)
			refreshSettingsControls(showWindowProc, setWindowPosProc, &app)
			return 0
		case wmHistoryRefreshDone:
			drainHistoryRefreshResult(&app)
			if invalidateRectProc != nil {
				if app.leftHwnd != 0 {
					invalidateRectProc.Call(app.leftHwnd, 0, 1)
				}
				if app.rightHwnd != 0 {
					invalidateRectProc.Call(app.rightHwnd, 0, 1)
				}
				if app.hwnd != 0 {
					invalidateRectProc.Call(app.hwnd, 0, 1)
				}
			}
			return 0
		case wmHistoryExportDone:
			drainHistoryExportResult(&app)
			if invalidateRectProc != nil {
				if app.rightHwnd != 0 {
					invalidateRectProc.Call(app.rightHwnd, 0, 1)
				}
				if app.hwnd != 0 {
					invalidateRectProc.Call(app.hwnd, 0, 1)
				}
			}
			return 0
		case wmDestroyGUI:
			guiLog("wmDestroy received")
			postQuitMessage.Call(0)
			return 0
		case wmCloseGUI:
			guiLog("wmClose received")
			postQuitMessage.Call(0)
			return 0
		}
		ret, _, _ := defWindowProc.Call(hwnd, uintptr(message), wParam, lParam)
		return ret
	})

	guiLog("stage=register class")
	atom, _, regErr := registerClass.Call(uintptr(unsafe.Pointer(&wndClass{
		style:         0,
		lpfnWndProc:   wndProc,
		hInstance:     hInstance,
		hIcon:         icon,
		hCursor:       cursor,
		hbrBackground: mainBgBrush,
		lpszClassName: className,
	})))
	if atom == 0 {
		guiLog(fmt.Sprintf("stage=register class failed err=%v", regErr))
		return fmt.Errorf("register class: %v", regErr)
	}

	guiLog("stage=create window")
	app.hwnd, _, _ = createWindowEx.Call(0, uintptr(unsafe.Pointer(className)), uintptr(unsafe.Pointer(title)), wsPopup|wsVisible|wsClipChildren, 200, 120, windowWidth, contentTop+leftPaneHeight+bottomBarHeight, 0, 0, hInstance, 0)
	if app.hwnd == 0 {
		guiLog("stage=create window failed")
		return fmt.Errorf("create window failed")
	}
	guiLog(fmt.Sprintf("stage=create window ok hwnd=%d", app.hwnd))
	logWindowState("after-create", app.hwnd, getWindowRect, isWindowVisible, isIconic)

	guiLog("stage=show window")
	prevVisible, _, _ := showWindowProc.Call(app.hwnd, 1)
	guiLog(fmt.Sprintf("stage=show window ret=%d", prevVisible))
	guiLog("stage=ensure visible")
	ensureWindowVisible("startup", app.hwnd, showWindowProc, setWindowPosProc, getWindowRect, isWindowVisible, isIconic, getSystemMetricsProc)
	if bringWindowToTop != nil {
		bringWindowToTop.Call(app.hwnd)
	}
	if setForegroundWindow != nil {
		setForegroundWindow.Call(app.hwnd)
	}
	guiLog("stage=ensure visible done")
	logWindowState("after-show", app.hwnd, getWindowRect, isWindowVisible, isIconic)
	guiLog("stage=message loop")

	var m msg
	for {
		r, _, _ := getMessage.Call(uintptr(unsafe.Pointer(&m)), 0, 0, 0)
		if int32(r) < 0 {
			guiLog("message loop exited with error")
			break
		}
		if int32(r) == 0 {
			guiLog("message loop received WM_QUIT")
			break
		}
		translateMessage.Call(uintptr(unsafe.Pointer(&m)))
		dispatchMessage.Call(uintptr(unsafe.Pointer(&m)))
	}
	return nil
}

func logWindowState(stage string, hwnd uintptr, getWindowRect, isWindowVisible, isIconic *syscall.LazyProc) {
	if hwnd == 0 {
		guiLog(stage + " hwnd=0")
		return
	}
	var rect struct {
		Left   int32
		Top    int32
		Right  int32
		Bottom int32
	}
	getWindowRect.Call(hwnd, uintptr(unsafe.Pointer(&rect)))
	visible, _, _ := isWindowVisible.Call(hwnd)
	minimized, _, _ := isIconic.Call(hwnd)
	guiLog(fmt.Sprintf(
		"%s hwnd=%d visible=%t minimized=%t rect=(%d,%d)-(%d,%d) size=%dx%d",
		stage,
		hwnd,
		visible != 0,
		minimized != 0,
		rect.Left,
		rect.Top,
		rect.Right,
		rect.Bottom,
		rect.Right-rect.Left,
		rect.Bottom-rect.Top,
	))
}

func refreshGUI(setWindowText *syscall.LazyProc, app *guiApp, reloadData bool) {
	if app == nil {
		return
	}
	if app.activeTab == "history" && !reloadData {
		syncPaneVisibility(app)
		return
	}
	start := time.Now()
	defer func() {
		if d := time.Since(start); d > 100*time.Millisecond {
			guiLog(fmt.Sprintf("refreshGUI slow=%s tab=%s reload=%t history=%d current=%d", d, app.activeTab, reloadData, len(app.historyRows), app.currentUserCount))
		}
	}()
	current := app.currentUsers
	instanceCount := app.currentUserCount
	worldLabel := app.currentWorld
	state := readRuntimeSnapshot()
	historyDirty := app.activeTab == "history" && app.historyReloadPending
	if reloadData {
		if app.activeTab == "translate" {
			guiLog("refreshGUI activeTab=translate light refresh")
			if instanceCount == 0 {
				instanceCount = countPresent(current)
			}
			if instanceCount == 0 && app.lastInstanceCount > 0 {
				instanceCount = app.lastInstanceCount
			}
			if instanceCount > 0 {
				app.lastInstanceCount = instanceCount
			}
			if world := strings.TrimSpace(stateString(state, "world")); world != "" {
				worldLabel = world
			}
			if strings.TrimSpace(worldLabel) == "" {
				worldLabel = "(unknown)"
			}
			app.currentWorld = worldLabel
		} else if app.activeTab == "history" {
			if historyDirty {
				guiLog(fmt.Sprintf("refreshGUI activeTab=history current=%d reload=%t", instanceCount, app.historyReloadPending))
			} else {
				guiLog(fmt.Sprintf("refreshGUI activeTab=history cached current=%d", instanceCount))
			}
			if out, ok := currentUsersFromGuestSnapshot(); ok {
				current = out
				instanceCount = countPresent(out)
				app.currentUsers = current
				app.currentUserCount = instanceCount
			} else if instanceCount == 0 && app.lastInstanceCount > 0 {
				instanceCount = app.lastInstanceCount
			}
			if instanceCount > 0 {
				app.lastInstanceCount = instanceCount
			}
			if world := strings.TrimSpace(stateString(state, "world")); world != "" {
				worldLabel = world
			}
			if strings.TrimSpace(worldLabel) == "" {
				worldLabel = "(unknown)"
			}
			app.currentWorld = worldLabel
		} else if app.activeTab == "settings" {
			if world := strings.TrimSpace(stateString(state, "world")); world != "" {
				worldLabel = world
			}
			if instanceCount == 0 && len(current) == 0 {
				if out, ok := currentUsersFromGuestSnapshot(); ok {
					current = out
					instanceCount = countPresent(out)
					app.currentUsers = current
					app.currentUserCount = instanceCount
				}
			}
			if instanceCount == 0 && app.lastInstanceCount > 0 {
				instanceCount = app.lastInstanceCount
			}
			if instanceCount > 0 {
				app.lastInstanceCount = instanceCount
			}
			if strings.TrimSpace(worldLabel) == "" {
				worldLabel = "(unknown)"
			}
			app.currentWorld = worldLabel
		} else {
			current, instanceCount = currentUsersFromJoinLeave()
			guiLog(fmt.Sprintf("refreshGUI activeTab=%s current=%d", app.activeTab, instanceCount))
			if instanceCount == 0 && app.lastInstanceCount > 0 {
				instanceCount = app.lastInstanceCount
			}
			if instanceCount > 0 {
				app.lastInstanceCount = instanceCount
			}
			app.currentUsers = current
			app.currentUserCount = instanceCount
			app.historyRows = historyRows()
			worldLabel = currentWorldLabel()
			if strings.TrimSpace(worldLabel) == "" {
				worldLabel = "(unknown)"
			}
			app.currentWorld = worldLabel
		}
	} else {
		if instanceCount == 0 {
			instanceCount = countPresent(current)
		}
		if strings.TrimSpace(worldLabel) == "" {
			worldLabel = "(unknown)"
		}
		guiLog(fmt.Sprintf("refreshGUI cached activeTab=%s current=%d", app.activeTab, instanceCount))
	}
	app.discordMuted = stateBool(state, "discord_muted")
	syncPaneVisibility(app)
	if app.leftHwnd != 0 {
		if app.activeTab == "join" || app.activeTab == "history" {
			showWindowProc.Call(app.leftHwnd, swShowControl)
			switch app.activeTab {
			case "join":
				app.leftPaneText = buildGuestPaneText(worldLabel, current)
				if reloadData {
					if err := appPkg.AppendDesktopJoinLog("Join Log", worldLabel, app.leftPaneText); err != nil {
						_ = appPkg.AppendRuntimeLog("GUI JOIN LOG WRITE FAIL", err.Error())
					}
				}
				updateJoinPaneLayout(app, instanceCount)
			case "history":
				ensureHistoryState(app)
				app.leftPaneText = ""
			default:
				app.leftPaneText = ""
			}
			if invalidateRectProc != nil {
				if app.activeTab != "history" || !reloadData || historyDirty {
					invalidateRectProc.Call(app.leftHwnd, 0, 1)
				}
			}
		} else {
			showWindowProc.Call(app.leftHwnd, swHideControl)
		}
	}
	if app.btnTopMost != 0 {
		label := "Top most: OFF"
		if app.topMost {
			label = "Top most: ON"
		}
		t, _ := syscall.UTF16PtrFromString(label)
		setWindowText.Call(app.btnTopMost, uintptr(unsafe.Pointer(t)))
	}
	if app.btnAutoUnmute != 0 {
		label := "Leave unmute: OFF"
		if app.autoUnmuteOnLeave {
			label = "Leave unmute: ON"
		}
		t, _ := syscall.UTF16PtrFromString(label)
		setWindowText.Call(app.btnAutoUnmute, uintptr(unsafe.Pointer(t)))
	}
	if app.activeTab == "settings" {
		if !app.lastSettingsVisible {
			resizeGUIForSettings(app)
			if setWindowText != nil {
				syncHistoryExportEditControls(app, setWindowText)
			}
			if invalidateRectProc != nil && app.settingsPaneHwnd != 0 {
				invalidateRectProc.Call(app.settingsPaneHwnd, 0, 1)
			}
		}
		return
	}
	app.lastSettingsVisible = false
	if app.rightHwnd != 0 {
		state["top_most"] = app.topMost
		state["font_size"] = app.fontSize
		state["auto_unmute_on_self_leave"] = app.autoUnmuteOnLeave
		if app.activeTab == "translate" || app.activeTab == "join" || app.activeTab == "history" {
			app.rightPaneText = formatRightPane(app.activeTab, state, worldLabel, instanceCount, current, len(app.historyRows))
			showWindowProc.Call(app.rightHwnd, swShowControl)
			if invalidateRectProc != nil {
				if app.activeTab != "history" || !reloadData || historyDirty {
					invalidateRectProc.Call(app.rightHwnd, 0, 1)
				}
			}
		} else {
			showWindowProc.Call(app.rightHwnd, swHideControl)
			if invalidateRectProc != nil {
				invalidateRectProc.Call(app.rightHwnd, 0, 1)
			}
		}
	}
	if app.settingsPaneHwnd != 0 {
		showWindowProc.Call(app.settingsPaneHwnd, swHideControl)
	}
	for _, hwnd := range []uintptr{app.btnTopMost, app.btnAutoUnmute, app.btnFontDown, app.btnFontUp} {
		if hwnd != 0 {
			showWindowProc.Call(hwnd, swHideControl)
		}
	}
	if invalidateRectProc != nil && app.hwnd != 0 {
		invalidateRectProc.Call(app.hwnd, 0, 1)
	}
}

func refreshCommandUI(setWindowText *syscall.LazyProc, app *guiApp) {
	if app == nil || setWindowText == nil {
		return
	}
	if app.btnTopMost != 0 {
		label := "Top most: OFF"
		if app.topMost {
			label = "Top most: ON"
		}
		t, _ := syscall.UTF16PtrFromString(label)
		setWindowText.Call(app.btnTopMost, uintptr(unsafe.Pointer(t)))
	}
	if app.btnAutoUnmute != 0 {
		label := "Leave unmute: OFF"
		if app.autoUnmuteOnLeave {
			label = "Leave unmute: ON"
		}
		t, _ := syscall.UTF16PtrFromString(label)
		setWindowText.Call(app.btnAutoUnmute, uintptr(unsafe.Pointer(t)))
	}
}

func refreshSettingsControls(showWindowProc, setWindowPosProc *syscall.LazyProc, app *guiApp) {
	if showWindowProc == nil || setWindowPosProc == nil || app == nil {
		return
	}
	if app.activeTab == "settings" {
		if app.lastSettingsVisible {
			return
		}
		app.lastSettingsVisible = true
		for _, hwnd := range []uintptr{app.btnTopMost, app.btnAutoUnmute, app.btnFontDown, app.btnFontUp} {
			if hwnd != 0 {
				showWindowProc.Call(hwnd, swHideControl)
			}
		}
		for _, hwnd := range []uintptr{app.settingsExportDirEdit, app.settingsExportCustomEdit} {
			if hwnd != 0 {
				showWindowProc.Call(hwnd, swShowControl)
			}
		}
		for _, hwnd := range []uintptr{app.settingsExportBrowseBtn, app.settingsExportCustomSaveBtn} {
			if hwnd != 0 {
				showWindowProc.Call(hwnd, swShowControl)
			}
		}
		return
	}
	if !app.lastSettingsVisible {
		return
	}
	app.lastSettingsVisible = false
	if app.settingsPaneHwnd != 0 {
		showWindowProc.Call(app.settingsPaneHwnd, swHideControl)
	}
	for _, hwnd := range []uintptr{app.btnTopMost, app.btnAutoUnmute, app.btnFontDown, app.btnFontUp, app.settingsExportDirEdit, app.settingsExportCustomEdit, app.settingsExportBrowseBtn, app.settingsExportCustomSaveBtn} {
		if hwnd != 0 {
			showWindowProc.Call(hwnd, swHideControl)
		}
	}
}

func syncPaneVisibility(app *guiApp) {
	if app == nil || showWindowProc == nil {
		return
	}
	switch app.activeTab {
	case "settings":
		if app.leftHwnd != 0 {
			showWindowProc.Call(app.leftHwnd, swHideControl)
		}
		if app.rightHwnd != 0 {
			showWindowProc.Call(app.rightHwnd, swHideControl)
		}
		if app.settingsPaneHwnd != 0 {
			showWindowProc.Call(app.settingsPaneHwnd, swShowControl)
		}
	default:
		if app.leftHwnd != 0 {
			showWindowProc.Call(app.leftHwnd, swShowControl)
		}
		if app.rightHwnd != 0 {
			showWindowProc.Call(app.rightHwnd, swShowControl)
		}
		if app.settingsPaneHwnd != 0 {
			showWindowProc.Call(app.settingsPaneHwnd, swHideControl)
		}
	}
}

func ensureWindowVisible(stage string, hwnd uintptr, showWindowProc, setWindowPosProc, getWindowRect, isWindowVisible, isIconic, getSystemMetrics *syscall.LazyProc) {
	if hwnd == 0 || getSystemMetrics == nil {
		return
	}
	var rect struct {
		Left   int32
		Top    int32
		Right  int32
		Bottom int32
	}
	if getWindowRect != nil {
		getWindowRect.Call(hwnd, uintptr(unsafe.Pointer(&rect)))
	}
	minimized := false
	visible := true
	if isIconic != nil {
		v, _, _ := isIconic.Call(hwnd)
		minimized = v != 0
	}
	if isWindowVisible != nil {
		v, _, _ := isWindowVisible.Call(hwnd)
		visible = v != 0
	}
	if minimized && showWindowProc != nil {
		showWindowProc.Call(hwnd, swRestore)
		guiLog(stage + " restored from minimized")
	}
	vx, _, _ := getSystemMetrics.Call(uintptr(smXVirtualScreen))
	vy, _, _ := getSystemMetrics.Call(uintptr(smYVirtualScreen))
	vw, _, _ := getSystemMetrics.Call(uintptr(smCXVirtualScreen))
	vh, _, _ := getSystemMetrics.Call(uintptr(smCYVirtualScreen))
	left := int32(vx)
	top := int32(vy)
	width := int32(vw)
	height := int32(vh)
	w := rect.Right - rect.Left
	h := rect.Bottom - rect.Top
	if w <= 0 {
		w = 760
	}
	if h <= 0 {
		h = 380
	}
	offscreen := rect.Right <= left || rect.Bottom <= top || rect.Left >= left+width || rect.Top >= top+height
	if offscreen && setWindowPosProc != nil {
		nx := left + (width-w)/2
		ny := top + (height-h)/2
		setWindowPosProc.Call(hwnd, 0, uintptr(nx), uintptr(ny), 0, 0, swpShowFlags)
		guiLog(fmt.Sprintf("%s recentered visible=%t minimized=%t old=(%d,%d)-(%d,%d) new=(%d,%d) screen=(%d,%d %dx%d)",
			stage, visible, minimized, rect.Left, rect.Top, rect.Right, rect.Bottom, nx, ny, left, top, width, height))
		return
	}
	guiLog(fmt.Sprintf("%s visible=%t minimized=%t rect=(%d,%d)-(%d,%d) screen=(%d,%d %dx%d)",
		stage, visible, minimized, rect.Left, rect.Top, rect.Right, rect.Bottom, left, top, width, height))
}

func raiseWindowToFront(hwnd uintptr, showWindowProc, setWindowPosProc, setActiveWindow, setForegroundWindow, bringWindowToTop *syscall.LazyProc) {
	if hwnd == 0 {
		return
	}
	if showWindowProc != nil {
		showWindowProc.Call(hwnd, swRestore)
	}
	if setWindowPosProc != nil {
		setWindowPosProc.Call(hwnd, hwndTopMostFlag, 0, 0, 0, 0, swpShowFlags)
		setWindowPosProc.Call(hwnd, hwndNotTopMostFlag, 0, 0, 0, 0, swpShowFlags)
	}
	if bringWindowToTop != nil {
		bringWindowToTop.Call(hwnd)
	}
	if setForegroundWindow != nil {
		setForegroundWindow.Call(hwnd)
	}
	if setActiveWindow != nil {
		setActiveWindow.Call(hwnd)
	}
	guiLog("startup raised window to front")
}

func applyTopMost(hwnd uintptr, app *guiApp) {
	if hwnd == 0 || app.topMost == app.lastTopMost {
		return
	}
	if app.topMost {
		setWindowPosProc.Call(hwnd, hwndTopMostFlag, 0, 0, 0, 0, swpFlags)
	} else {
		setWindowPosProc.Call(hwnd, hwndNotTopMostFlag, 0, 0, 0, 0, swpFlags)
	}
	app.lastTopMost = app.topMost
}

func createAppFont(size int) uintptr {
	return createAppFontWithWeight(size, 400)
}

func createAppFontWithWeight(size int, weight int32) uintptr {
	if createFontProc == nil {
		return defaultGUIFont
	}
	h, _, _ := createFontProc.Call(
		uintptr(-size), 0, 0, 0, uintptr(weight), 0, 0, 0,
		128, 0, 0, 0, 0,
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("Yu Gothic UI"))),
	)
	if h == 0 && defaultGUIFont != 0 {
		return defaultGUIFont
	}
	return h
}

func applyFont(app *guiApp) {
	if sendMessageProc == nil || app.hFont == 0 {
		return
	}
	targets := []uintptr{app.rightHwnd, app.navBarHwnd, app.settingsPaneHwnd, app.settingsExportDirEdit, app.settingsExportBrowseBtn, app.settingsExportCustomEdit, app.settingsExportCustomSaveBtn}
	for _, hwnd := range targets {
		if hwnd == 0 {
			continue
		}
		sendMessageProc.Call(hwnd, wmSetFont, app.hFont, 1)
	}
	applyJoinLogFont(app, app.lastInstanceCount)
}

func applyJoinLogFont(app *guiApp, presentCount int) {
	if app == nil || app.leftHwnd == 0 {
		return
	}
	size := joinLogFontSize(app.fontSize, presentCount)
	if size <= 0 {
		size = app.fontSize
	}
	if size <= 0 {
		size = defaultGUIFontSize
	}
	if app.joinHFont != 0 && app.joinBoldHFont != 0 && app.joinHeadlineHFont != 0 &&
		app.joinFontSize == size && app.joinBoldFontSize == size && app.joinHeadlineSize == size+2 {
		return
	}
	newFont := createAppFont(size)
	if newFont == 0 {
		newFont = defaultGUIFont
	}
	if newFont == 0 {
		return
	}
	boldFont := createAppFontWithWeight(size, 700)
	headlineSize := size + 2
	if headlineSize > 30 {
		headlineSize = 30
	}
	headlineFont := createAppFontWithWeight(headlineSize, 700)
	oldFont := app.joinHFont
	oldBoldFont := app.joinBoldHFont
	oldHeadlineFont := app.joinHeadlineHFont
	app.joinHFont = newFont
	app.joinFontSize = size
	app.joinBoldHFont = boldFont
	app.joinBoldFontSize = size
	app.joinHeadlineHFont = headlineFont
	app.joinHeadlineSize = headlineSize
	if oldFont != 0 && oldFont != app.hFont && oldFont != defaultGUIFont && deleteObjectProc != nil {
		deleteObjectProc.Call(oldFont)
	}
	if oldBoldFont != 0 && oldBoldFont != oldFont && oldBoldFont != app.hFont && oldBoldFont != defaultGUIFont && deleteObjectProc != nil {
		deleteObjectProc.Call(oldBoldFont)
	}
	if oldHeadlineFont != 0 && oldHeadlineFont != oldFont && oldHeadlineFont != oldBoldFont && oldHeadlineFont != app.hFont && oldHeadlineFont != defaultGUIFont && deleteObjectProc != nil {
		deleteObjectProc.Call(oldHeadlineFont)
	}
}

func updateJoinPaneLayout(app *guiApp, presentCount int) {
	if app == nil || app.leftHwnd == 0 {
		return
	}
	lines := joinPaneLineCount(app.leftPaneText)
	if lines < 1 {
		lines = 1
	}
	contentHeight := joinPaneContentHeight(app.fontSize, lines)
	if contentHeight < leftPaneHeight {
		contentHeight = leftPaneHeight
	}
	availableHeight := maxJoinPaneContentHeight()
	fontSize := fitJoinLogFontSize(app.fontSize, lines, availableHeight)
	applyJoinLogFontSize(app, fontSize)
	contentHeight = joinPaneContentHeight(fontSize, lines)
	if contentHeight < leftPaneHeight {
		contentHeight = leftPaneHeight
	}
	if availableHeight > 0 && contentHeight > availableHeight {
		contentHeight = availableHeight
	}
	if contentHeight != app.lastLayoutHeight {
		resizeGUIForJoinContent(app, contentHeight)
		app.lastLayoutHeight = contentHeight
	}
	if invalidateRectProc != nil {
		invalidateRectProc.Call(app.leftHwnd, 0, 1)
	}
}

func applyJoinLogFontSize(app *guiApp, size int) {
	if app == nil || app.leftHwnd == 0 {
		return
	}
	if size <= 0 {
		size = defaultGUIFontSize
	}
	if app.joinHFont != 0 && app.joinBoldHFont != 0 && app.joinFontSize == size && app.joinBoldFontSize == size {
		return
	}
	newFont := createAppFont(size)
	if newFont == 0 {
		newFont = defaultGUIFont
	}
	if newFont == 0 {
		return
	}
	boldFont := createAppFontWithWeight(size, 700)
	oldFont := app.joinHFont
	oldBoldFont := app.joinBoldHFont
	app.joinHFont = newFont
	app.joinFontSize = size
	app.joinBoldHFont = boldFont
	app.joinBoldFontSize = size
	if oldFont != 0 && oldFont != app.hFont && oldFont != defaultGUIFont && deleteObjectProc != nil {
		deleteObjectProc.Call(oldFont)
	}
	if oldBoldFont != 0 && oldBoldFont != oldFont && oldBoldFont != app.hFont && oldBoldFont != defaultGUIFont && deleteObjectProc != nil {
		deleteObjectProc.Call(oldBoldFont)
	}
}

func fitJoinLogFontSize(baseSize, lineCount, availableHeight int) int {
	size := baseSize
	if size <= 0 {
		size = defaultGUIFontSize
	}
	if lineCount <= 0 {
		lineCount = 1
	}
	if availableHeight <= 0 {
		availableHeight = 300
	}
	for size > minGUIFontSize {
		if joinPaneContentHeight(size, lineCount) <= availableHeight {
			break
		}
		size -= 2
	}
	if size < minGUIFontSize {
		size = minGUIFontSize
	}
	return size
}

func joinPaneLineCount(text string) int {
	trimmed := strings.TrimRight(text, "\r\n")
	if trimmed == "" {
		return 1
	}
	return len(strings.Split(trimmed, "\n"))
}

func joinPaneContentHeight(fontSize, lineCount int) int {
	lineHeight := joinPaneLineHeight(fontSize)
	height := lineCount*lineHeight + 16
	if height < leftPaneHeight {
		height = leftPaneHeight
	}
	return height
}

func joinPaneLineHeight(fontSize int) int {
	lineHeight := fontSize + 3
	if lineHeight < 12 {
		lineHeight = 12
	}
	return lineHeight
}

func maxJoinPaneContentHeight() int {
	if getSystemMetricsProc == nil {
		return 0
	}
	vh, _, _ := getSystemMetricsProc.Call(uintptr(smCYVirtualScreen))
	if vh <= 0 {
		return 0
	}
	return int(vh) - contentTop - 56
}

func resizeGUIForJoinContent(app *guiApp, contentHeight int) {
	if app == nil || setWindowPosProc == nil || app.hwnd == 0 {
		return
	}
	if contentHeight < leftPaneHeight {
		contentHeight = leftPaneHeight
	}
	resizeFlags := hwndNoMove | hwndNoZOrder | hwndNoActivate
	windowHeight := contentTop + contentHeight + bottomBarHeight
	setWindowPosProc.Call(app.hwnd, 0, 0, 0, windowWidth, uintptr(windowHeight), resizeFlags)
	for _, item := range []struct {
		hwnd  uintptr
		width int
	}{
		{app.leftHwnd, leftPaneWidth},
		{app.rightHwnd, rightPaneWidth},
		{app.settingsPaneHwnd, settingsPaneWidth},
	} {
		if item.hwnd != 0 {
			setWindowPosProc.Call(item.hwnd, 0, 0, 0, uintptr(item.width), uintptr(contentHeight), resizeFlags)
		}
	}
}

func resizeGUIForSettings(app *guiApp) {
	if app == nil || setWindowPosProc == nil || app.hwnd == 0 {
		return
	}
	resizeFlags := hwndNoMove | hwndNoZOrder | hwndNoActivate
	windowHeight := contentTop + leftPaneHeight + bottomBarHeight
	setWindowPosProc.Call(app.hwnd, 0, 0, 0, windowWidth, uintptr(windowHeight), resizeFlags)
	if app.settingsPaneHwnd != 0 {
		setWindowPosProc.Call(app.settingsPaneHwnd, 0, 0, uintptr(contentTop), windowWidth, uintptr(leftPaneHeight), resizeFlags)
	}
}

type winRect struct {
	Left   int32
	Top    int32
	Right  int32
	Bottom int32
}

type paintStruct struct {
	Hdc         uintptr
	FErase      int32
	RcPaint     winRect
	FRestore    int32
	FIncUpdate  int32
	RgbReserved [32]byte
}

type textMetric struct {
	Height           int32
	Ascent           int32
	Descent          int32
	InternalLeading  int32
	ExternalLeading  int32
	AveCharWidth     int32
	MaxCharWidth     int32
	Weight           int32
	Overhang         int32
	DigitizedAspectX int32
	DigitizedAspectY int32
	FirstChar        byte
	LastChar         byte
	DefaultChar      byte
	BreakChar        byte
	Italic           byte
	Underlined       byte
	StruckOut        byte
	PitchAndFamily   byte
	CharSet          byte
}

type textSize struct {
	Cx int32
	Cy int32
}

const (
	sbLineUp           = 0
	sbLineDown         = 1
	sbPageUp           = 2
	sbPageDown         = 3
	sbThumbPosition    = 4
	sbThumbTrack       = 5
	sbTop              = 6
	sbBottom           = 7
	sbEndScroll        = 8
	sifRange           = 0x0001
	sifPage            = 0x0002
	sifPos             = 0x0004
	sifDisableNoScroll = 0x0008
	sifTrackPos        = 0x0010
	sifAll             = sifRange | sifPage | sifPos | sifTrackPos
	siVert             = 1
	scrollLineStep     = 3
)

type scrollInfo struct {
	cbSize    uint32
	fMask     uint32
	nMin      int32
	nMax      int32
	nPage     uint32
	nPos      int32
	nTrackPos int32
}

func paintMainWindow(hwnd uintptr, app *guiApp) uintptr {
	if app == nil || beginPaintProc == nil || endPaintProc == nil || getClientRectProc == nil {
		return 0
	}
	var ps paintStruct
	hdc, _, _ := beginPaintProc.Call(hwnd, uintptr(unsafe.Pointer(&ps)))
	if hdc == 0 {
		return 0
	}
	defer endPaintProc.Call(hwnd, uintptr(unsafe.Pointer(&ps)))

	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	if setBkModeProc != nil {
		setBkModeProc.Call(hdc, 1)
	}
	fillSolid(hdc, rc, clrMainBg)
	fillSolid(hdc, winRect{Left: 0, Top: 0, Right: rc.Right, Bottom: headerHeight}, clrHeaderBg)
	fillSolid(hdc, winRect{Left: 0, Top: headerHeight, Right: rc.Right, Bottom: contentTop}, clrNavBg)

	drawPaneText(hdc, 22, 16, "VRC OSC", app.hFont, clrText)
	drawWindowDot(hdc, rc.Right-92, 22, 0x0059a7ff)
	drawWindowDot(hdc, rc.Right-62, 22, 0x004ee343)
	drawWindowDot(hdc, rc.Right-32, 22, 0x005a5cff)
	drawPaneText(hdc, rc.Right-38, 13, "×", app.hFont, clrText)

	activeLeft := int32(0)
	switch app.activeTab {
	case "history":
		activeLeft = 120
	case "translate":
		activeLeft = 240
	case "settings":
		activeLeft = 360
	}
	fillSolid(hdc, winRect{Left: activeLeft, Top: headerHeight, Right: activeLeft + 120, Bottom: contentTop}, clrNavActiveBg)
	drawPaneText(hdc, 36, headerHeight+18, "ログ", app.hFont, tabColor(app.activeTab == "join"))
	drawPaneText(hdc, 154, headerHeight+18, "履歴", app.hFont, tabColor(app.activeTab == "history"))
	drawPaneText(hdc, 274, headerHeight+18, "翻訳", app.hFont, tabLabelColor(app.activeTab == "translate", translateTabEnabled))
	drawPaneText(hdc, 394, headerHeight+18, "設定", app.hFont, tabColor(app.activeTab == "settings"))
	drawLine(hdc, activeLeft, contentTop-3, activeLeft+120, contentTop-3, clrAccentBlue)
	drawLine(hdc, 0, contentTop, rc.Right, contentTop, clrPaneBorder)

	paintFooter(hdc, rc, app)
	return 0
}

func pointInHeaderDot(x, y, cx, cy int32) bool {
	return x >= cx-11 && x <= cx+11 && y >= cy-11 && y <= cy+11
}

func paintFooter(hdc uintptr, rc winRect, app *guiApp) {
	if app == nil {
		return
	}
	statusTop := rc.Bottom - bottomBarHeight
	fillSolid(hdc, winRect{Left: 0, Top: statusTop, Right: rc.Right, Bottom: rc.Bottom}, 0x00281709)
	drawLine(hdc, 0, statusTop, rc.Right, statusTop, clrPaneBorder)

	world := strings.TrimSpace(app.currentWorld)
	if world == "" {
		world = "(unknown)"
	}
	users := app.currentUserCount
	if users == 0 {
		users = countPresent(app.currentUsers)
	}
	muted := app.discordMuted

	drawFilledEllipse(hdc, 28, statusTop+15, 50, statusTop+37, clrAccentBlue)
	drawPaneText(hdc, 66, statusTop+14, ellipsizeRunes(world, 22), app.hFont, clrText)
	drawPaneText(hdc, 250, statusTop+14, "|", app.hFont, clrPaneBorder)
	drawPaneText(hdc, 286, statusTop+14, "人数", app.hFont, clrMutedText)
	drawPaneText(hdc, 330, statusTop+14, fmt.Sprintf("%d人", users), app.hFont, clrText)

	badgeLeft := rc.Right - 166
	badgeRight := rc.Right - 20
	badgeColor := uint32(0x00183f16)
	label := "● ミュート解除"
	textColor := uint32(clrAccentGreen)
	if muted {
		badgeColor = 0x001b164c
		label = "● ミュート中"
		textColor = uint32(clrAccentRed)
	}
	fillSolid(hdc, winRect{Left: badgeLeft, Top: statusTop + 9, Right: badgeRight, Bottom: statusTop + 40}, badgeColor)
	drawLine(hdc, badgeLeft, statusTop+9, badgeRight, statusTop+9, textColor)
	drawLine(hdc, badgeLeft, statusTop+40, badgeRight, statusTop+40, textColor)
	drawLine(hdc, badgeLeft, statusTop+9, badgeLeft, statusTop+40, textColor)
	drawLine(hdc, badgeRight, statusTop+9, badgeRight, statusTop+40, textColor)
	drawPaneText(hdc, badgeLeft+18, statusTop+15, label, app.hFont, textColor)
}

func paintJoinPane(hwnd uintptr, app *guiApp) uintptr {
	if app == nil {
		return 0
	}
	return paintMemberPane(hwnd, app)
}

func paintLeftPane(hwnd uintptr, app *guiApp) uintptr {
	if app == nil {
		return 0
	}
	switch app.activeTab {
	case "join":
		return paintMemberPane(hwnd, app)
	case "history":
		return paintHistoryCalendarPane(hwnd, app)
	case "settings":
		return paintSettingsPane(hwnd, app)
	default:
		return paintPaneBackground(hwnd, app, 0)
	}
}

func paintRightPane(hwnd uintptr, app *guiApp) uintptr {
	if app == nil {
		return 0
	}
	if app.activeTab == "join" {
		return paintEventPane(hwnd, app)
	}
	if app.activeTab == "history" {
		return paintHistoryDetailPane(hwnd, app)
	}
	return paintTextPane(hwnd, app, app.rightPaneText)
}

func paintSettingsPane(hwnd uintptr, app *guiApp) uintptr {
	if app == nil {
		return 0
	}
	start := time.Now()
	defer func() {
		if d := time.Since(start); d > 80*time.Millisecond {
			guiLog(fmt.Sprintf("paintSettingsPane slow=%s", d))
		}
	}()
	hdc, done := beginPanePaint(hwnd)
	if hdc == 0 {
		return 0
	}
	defer done()
	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	fillSolid(hdc, rc, clrPaneBg)
	drawPaneText(hdc, 24, 20, "設定", app.joinBoldHFont, clrAccentGreen)
	drawLine(hdc, 24, 50, rc.Right-24, 50, clrPaneBorder)

	drawPaneText(hdc, 24, 68, "表示", app.hFont, clrMutedText)
	drawSettingsWideButton(hdc, settingsTopMostRect(), "Top most", onOffBool(app.topMost), app.hFont, app.topMost)
	drawSettingsWideButton(hdc, settingsAutoUnmuteRect(), "Leave unmute", onOffBool(app.autoUnmuteOnLeave), app.hFont, app.autoUnmuteOnLeave)
	drawPaneText(hdc, 24, 190, "文字サイズ", app.hFont, clrMutedText)
	drawSettingsRefreshControl(hdc, app)
	drawSettingsFontControl(hdc, app)
	drawPaneText(hdc, 24, 374, "履歴 Export", app.hFont, clrMutedText)
	drawPaneText(hdc, 24, 396, "出力先フォルダ", app.hFont, clrMutedText)
	drawSettingsWideButton(hdc, settingsHistoryExportTimeRect(), "Time", onOffBool(app.historyExportIncludeTime), app.hFont, app.historyExportIncludeTime)
	drawSettingsWideButton(hdc, settingsHistoryExportWorldRect(), "World", onOffBool(app.historyExportIncludeWorld), app.hFont, app.historyExportIncludeWorld)
	drawSettingsWideButton(hdc, settingsHistoryExportJoinLeaveRect(), "Join/Leave", onOffBool(app.historyExportIncludeJoinLeave), app.hFont, app.historyExportIncludeJoinLeave)
	drawSettingsWideButton(hdc, settingsHistoryExportCustomToggleRect(), "Custom", onOffBool(app.historyExportCustomEnabled), app.hFont, app.historyExportCustomEnabled)
	drawPaneText(hdc, 24, 516, "Custom 条件", app.hFont, clrMutedText)
	return 0
}

func settingsTopMostRect() winRect {
	return winRect{Left: 24, Top: 92, Right: 268, Bottom: 128}
}

func settingsAutoUnmuteRect() winRect {
	return winRect{Left: 24, Top: 140, Right: 268, Bottom: 176}
}

func settingsRefreshDownRect() winRect {
	return winRect{Left: 24, Top: 214, Right: 104, Bottom: 250}
}

func settingsRefreshValueRect() winRect {
	return winRect{Left: 106, Top: 214, Right: 186, Bottom: 250}
}

func settingsRefreshUpRect() winRect {
	return winRect{Left: 188, Top: 214, Right: 268, Bottom: 250}
}

func settingsRefreshUnitRect() winRect {
	return winRect{Left: 24, Top: 258, Right: 268, Bottom: 294}
}

func settingsFontDownRect() winRect {
	return winRect{Left: 24, Top: 338, Right: 104, Bottom: 374}
}

func settingsFontValueRect() winRect {
	return winRect{Left: 106, Top: 338, Right: 186, Bottom: 374}
}

func settingsFontUpRect() winRect {
	return winRect{Left: 188, Top: 338, Right: 268, Bottom: 374}
}

func settingsHistoryExportDirRect() winRect {
	return winRect{Left: 116, Top: 420, Right: 636, Bottom: 444}
}

func settingsHistoryExportBrowseRect() winRect {
	return winRect{Left: 644, Top: 420, Right: 736, Bottom: 444}
}

func settingsHistoryExportTimeRect() winRect {
	return winRect{Left: 24, Top: 452, Right: 360, Bottom: 482}
}

func settingsHistoryExportWorldRect() winRect {
	return winRect{Left: 376, Top: 452, Right: 736, Bottom: 482}
}

func settingsHistoryExportJoinLeaveRect() winRect {
	return winRect{Left: 24, Top: 488, Right: 360, Bottom: 518}
}

func settingsHistoryExportCustomToggleRect() winRect {
	return winRect{Left: 376, Top: 488, Right: 736, Bottom: 518}
}

func settingsHistoryExportCustomRect() winRect {
	return winRect{Left: 116, Top: 536, Right: 636, Bottom: 558}
}

func settingsHistoryExportCustomSaveRect() winRect {
	return winRect{Left: 644, Top: 536, Right: 736, Bottom: 558}
}

func handleSettingsPaneClick(app *guiApp, x, y int32, getWindowText, setWindowText *syscall.LazyProc) bool {
	if app == nil || !allowRapidSettingsAction(app) {
		return true
	}
	switch {
	case pointInRect(x, y, settingsTopMostRect()):
		app.topMost = !app.topMost
		saveGUISettings(app)
		applyTopMost(app.hwnd, app)
	case pointInRect(x, y, settingsAutoUnmuteRect()):
		app.autoUnmuteOnLeave = !app.autoUnmuteOnLeave
		saveGUISettings(app)
	case pointInRect(x, y, settingsRefreshDownRect()):
		if adjustRefreshInterval(app, -1) {
			saveGUISettings(app)
			applyRefreshTimer(app.hwnd, app)
		}
	case pointInRect(x, y, settingsRefreshUpRect()):
		if adjustRefreshInterval(app, 1) {
			saveGUISettings(app)
			applyRefreshTimer(app.hwnd, app)
		}
	case pointInRect(x, y, settingsRefreshUnitRect()):
		if toggleRefreshIntervalUnit(app) {
			saveGUISettings(app)
			applyRefreshTimer(app.hwnd, app)
		}
	case pointInRect(x, y, settingsFontDownRect()):
		if app.fontSize > minGUIFontSize {
			app.fontSize -= 2
			if app.fontSize < minGUIFontSize {
				app.fontSize = minGUIFontSize
			}
			app.hFont = createAppFont(app.fontSize)
			applyFont(app)
			saveGUISettings(app)
		}
	case pointInRect(x, y, settingsFontUpRect()):
		if app.fontSize < maxGUIFontSize {
			app.fontSize += 2
			if app.fontSize > maxGUIFontSize {
				app.fontSize = maxGUIFontSize
			}
			app.hFont = createAppFont(app.fontSize)
			applyFont(app)
			saveGUISettings(app)
		}
	case pointInRect(x, y, settingsHistoryExportTimeRect()):
		app.historyExportIncludeTime = !app.historyExportIncludeTime
		saveGUISettings(app)
	case pointInRect(x, y, settingsHistoryExportWorldRect()):
		app.historyExportIncludeWorld = !app.historyExportIncludeWorld
		saveGUISettings(app)
	case pointInRect(x, y, settingsHistoryExportJoinLeaveRect()):
		app.historyExportIncludeJoinLeave = !app.historyExportIncludeJoinLeave
		saveGUISettings(app)
	case pointInRect(x, y, settingsHistoryExportCustomToggleRect()):
		app.historyExportCustomEnabled = !app.historyExportCustomEnabled
		saveGUISettings(app)
	case pointInRect(x, y, settingsHistoryExportBrowseRect()):
		if handleHistoryExportBrowseCommand(app, setWindowText) {
			return true
		}
	case pointInRect(x, y, settingsHistoryExportCustomSaveRect()):
		if handleHistoryExportSaveCommand(app, getWindowText, setWindowText) {
			return true
		}
	default:
		return false
	}
	refreshCommandUI(setWindowText, app)
	if invalidateRectProc != nil {
		if app.settingsPaneHwnd != 0 {
			invalidateRectProc.Call(app.settingsPaneHwnd, 0, 1)
		}
	}
	return true
}

func drawSettingsRefreshControl(hdc uintptr, app *guiApp) {
	font := app.hFont
	fill := uint32(0x00443120)
	border := uint32(clrPaneBorder)
	drawSettingsBox(hdc, settingsRefreshDownRect(), fill, border)
	drawSettingsBox(hdc, settingsRefreshValueRect(), uint32(0x0038281a), border)
	drawSettingsBox(hdc, settingsRefreshUpRect(), fill, border)
	drawSettingsWideButton(hdc, settingsRefreshUnitRect(), "\u5358\u4f4d", refreshIntervalUnitLabel(app.refreshIntervalUnit), font, true)
	drawCenteredPaneText(hdc, settingsRefreshDownRect(), "A-", font, clrText)
	drawCenteredPaneText(hdc, settingsRefreshValueRect(), refreshIntervalValueLabel(app.refreshIntervalValue, app.refreshIntervalUnit), font, clrMutedText)
	drawCenteredPaneText(hdc, settingsRefreshUpRect(), "A+", font, clrText)
}

func refreshIntervalValueLabel(value int, unit string) string {
	value, unit = normalizeRefreshIntervalSettings(value, unit)
	return strconv.Itoa(value)
}

func refreshIntervalUnitLabel(unit string) string {
	_, unit = normalizeRefreshIntervalSettings(1, unit)
	if unit == "min" {
		return "\u5206"
	}
	return "\u79d2"
}

func normalizeRefreshIntervalSettings(value int, unit string) (int, string) {
	unit = strings.ToLower(strings.TrimSpace(unit))
	if unit != "min" {
		unit = "sec"
	}
	if value <= 0 {
		value = 2
	}
	switch unit {
	case "min":
		if value > 60 {
			value = 60
		}
	default:
		if value > 3600 {
			value = 3600
		}
	}
	return value, unit
}

func refreshIntervalDuration(value int, unit string) time.Duration {
	value, unit = normalizeRefreshIntervalSettings(value, unit)
	if unit == "min" {
		return time.Duration(value) * time.Minute
	}
	return time.Duration(value) * time.Second
}

func adjustRefreshInterval(app *guiApp, delta int) bool {
	if app == nil || delta == 0 {
		return false
	}
	value, unit := normalizeRefreshIntervalSettings(app.refreshIntervalValue, app.refreshIntervalUnit)
	value += delta
	if unit == "min" {
		if value < 1 {
			value = 1
		}
		if value > 60 {
			value = 60
		}
	} else {
		if value < 1 {
			value = 1
		}
		if value > 3600 {
			value = 3600
		}
	}
	app.refreshIntervalValue = value
	app.refreshIntervalUnit = unit
	return true
}

func toggleRefreshIntervalUnit(app *guiApp) bool {
	if app == nil {
		return false
	}
	value, unit := normalizeRefreshIntervalSettings(app.refreshIntervalValue, app.refreshIntervalUnit)
	if unit == "sec" {
		next := (value + 59) / 60
		if next < 1 {
			next = 1
		}
		if next > 60 {
			next = 60
		}
		app.refreshIntervalValue = next
		app.refreshIntervalUnit = "min"
		return true
	}
	next := value * 60
	if next < 1 {
		next = 1
	}
	if next > 3600 {
		next = 3600
	}
	app.refreshIntervalValue = next
	app.refreshIntervalUnit = "sec"
	return true
}

func applyRefreshTimer(hwnd uintptr, app *guiApp) {
	if hwnd == 0 || app == nil || setTimerProc == nil {
		return
	}
	interval := refreshIntervalDuration(app.refreshIntervalValue, app.refreshIntervalUnit)
	ms := int64(interval / time.Millisecond)
	if ms < 1000 {
		ms = 1000
	}
	if ms > int64(^uint32(0)) {
		ms = int64(^uint32(0))
	}
	setTimerProc.Call(hwnd, timerRefresh, uintptr(uint32(ms)), 0)
}

func pointInRect(x, y int32, rc winRect) bool {
	return x >= rc.Left && x < rc.Right && y >= rc.Top && y < rc.Bottom
}

func handlePaneVScroll(hwnd uintptr, app *guiApp, wParam uintptr) bool {
	if app == nil || getClientRectProc == nil {
		return false
	}
	code := uint32(wParam & 0xffff)
	var pos *int
	var contentHeight int32
	switch hwnd {
	case app.rightHwnd:
		switch app.activeTab {
		case "join":
			pos = &app.eventScrollPos
			contentHeight = eventPaneContentHeight(hwnd, app)
		case "history":
			pos = &app.historyScrollPos
			contentHeight = historyDetailContentHeight(hwnd, app)
		default:
			return false
		}
	default:
		return false
	}
	if pos == nil {
		return false
	}
	pageHeight := paneClientHeight(hwnd)
	if pageHeight <= 0 {
		return false
	}
	maxPos := scrollMax(contentHeight, pageHeight)
	next := *pos
	switch code {
	case sbLineUp:
		next -= scrollLineStep
	case sbLineDown:
		next += scrollLineStep
	case sbPageUp:
		next -= int(pageHeight / 3)
	case sbPageDown:
		next += int(pageHeight / 3)
	case sbThumbPosition, sbThumbTrack:
		if getScrollInfoProc != nil {
			info := scrollInfo{
				cbSize: uint32(unsafe.Sizeof(scrollInfo{})),
				fMask:  sifTrackPos | sifPos,
			}
			if r1, _, _ := getScrollInfoProc.Call(hwnd, siVert, uintptr(unsafe.Pointer(&info))); r1 != 0 && info.nTrackPos >= 0 {
				next = int(info.nTrackPos)
			} else {
				next = int(uint16(wParam >> 16))
			}
		} else {
			next = int(uint16(wParam >> 16))
		}
	case sbTop:
		next = 0
	case sbBottom:
		next = maxPos
	case sbEndScroll:
		return true
	default:
		return false
	}
	if next < 0 {
		next = 0
	}
	if next > maxPos {
		next = maxPos
	}
	if next == *pos {
		return true
	}
	*pos = next
	applyPaneScroll(hwnd, next, contentHeight, pageHeight)
	if invalidateRectProc != nil {
		invalidateRectProc.Call(hwnd, 0, 1)
	}
	return true
}

func handlePaneMouseWheel(hwnd uintptr, app *guiApp, delta int32) bool {
	if delta == 0 {
		return false
	}
	if app != nil && hwnd == app.rightHwnd && app.activeTab == "history" {
		if delta > 0 {
			return handlePaneVScroll(hwnd, app, sbLineUp)
		}
		return handlePaneVScroll(hwnd, app, sbLineDown)
	}
	if delta > 0 {
		return handlePaneVScroll(hwnd, app, sbLineUp)
	}
	return handlePaneVScroll(hwnd, app, sbLineDown)
}

func paneClientHeight(hwnd uintptr) int32 {
	if getClientRectProc == nil {
		return 0
	}
	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	return rc.Bottom - rc.Top
}

func scrollMax(contentHeight, pageHeight int32) int {
	maxPos := int(contentHeight - pageHeight)
	if maxPos < 0 {
		maxPos = 0
	}
	return maxPos
}

func applyPaneScroll(hwnd uintptr, pos int, contentHeight, pageHeight int32) {
	if setScrollInfoProc == nil || hwnd == 0 {
		return
	}
	maxPos := scrollMax(contentHeight, pageHeight)
	if pos < 0 {
		pos = 0
	}
	if pos > maxPos {
		pos = maxPos
	}
	info := scrollInfo{
		cbSize:    uint32(unsafe.Sizeof(scrollInfo{})),
		fMask:     sifAll | sifDisableNoScroll,
		nMin:      0,
		nMax:      contentHeight - 1,
		nPage:     uint32(pageHeight),
		nPos:      int32(pos),
		nTrackPos: int32(pos),
	}
	setScrollInfoProc.Call(hwnd, siVert, uintptr(unsafe.Pointer(&info)), 1)
}

func memberPaneContentHeight(hwnd uintptr, app *guiApp) int32 {
	if app == nil || getClientRectProc == nil {
		return 0
	}
	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	users := app.currentUsers
	if len(users) == 0 {
		users, _ = currentUsersFromJoinLeave()
	}
	present := make([]userState, 0, len(users))
	for _, u := range users {
		if u.Present {
			present = append(present, u)
		}
	}
	columns := 1
	if len(present) > 24 {
		columns = 2
	}
	if len(present) > 60 {
		columns = 3
	}
	availableHeight := rc.Bottom - rc.Top - 78
	if availableHeight < 120 {
		availableHeight = 120
	}
	rowsPerCol := (len(present) + columns - 1) / columns
	if rowsPerCol < 1 {
		rowsPerCol = 1
	}
	rowHeight := availableHeight / int32(rowsPerCol)
	if rowHeight < 24 {
		rowHeight = 24
	}
	return 70 + int32(rowsPerCol)*rowHeight + 8
}

func eventPaneContentHeight(hwnd uintptr, app *guiApp) int32 {
	if app == nil || getClientRectProc == nil {
		return 0
	}
	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	events := joinLeaveRowsForCurrentWorld(app)
	y := int32(80)
	for _, ev := range events {
		nameLines := splitDisplayName(ev.name, 8)
		if len(nameLines) > 1 {
			y += 76
		} else {
			y += 54
		}
	}
	if y < 120 {
		y = 120
	}
	return y
}

func paintPaneBackground(hwnd uintptr, app *guiApp, wParam uintptr) uintptr {
	if fillRectProc == nil || getClientRectProc == nil {
		return 1
	}
	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	brush := paneBgBrush
	if brush == 0 && getSysColorBrushProc != nil {
		brush, _, _ = getSysColorBrushProc.Call(5)
	}
	if brush != 0 {
		fillRectProc.Call(wParam, uintptr(unsafe.Pointer(&rc)), brush)
	}
	_ = app
	return 1
}

func paintMemberPane(hwnd uintptr, app *guiApp) uintptr {
	hdc, done := beginPanePaint(hwnd)
	if hdc == 0 {
		return 0
	}
	defer done()
	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	fillSolid(hdc, rc, clrPaneBg)
	drawLine(hdc, rc.Right-1, 0, rc.Right-1, rc.Bottom, clrPaneBorder)
	users := app.currentUsers
	if len(users) == 0 {
		users, _ = currentUsersFromJoinLeave()
	}
	drawPaneText(hdc, 24, 24, fmt.Sprintf("現在のメンバー (%d)", countPresent(users)), app.hFont, clrMutedText)
	drawLine(hdc, 0, 58, rc.Right, 58, clrPaneBorder)
	present := make([]userState, 0, len(users))
	for _, u := range users {
		if u.Present {
			present = append(present, u)
		}
	}
	sort.SliceStable(present, func(i, j int) bool {
		if present[i].LastJoin.Equal(present[j].LastJoin) {
			return strings.ToLower(present[i].Name) < strings.ToLower(present[j].Name)
		}
		if present[i].LastJoin.IsZero() {
			return false
		}
		if present[j].LastJoin.IsZero() {
			return true
		}
		return present[i].LastJoin.After(present[j].LastJoin)
	})
	if len(present) == 0 {
		applyPaneScroll(hwnd, 0, 120, rc.Bottom-rc.Top)
		return 0
	}
	columns := 1
	if len(present) > 24 {
		columns = 2
	}
	if len(present) > 60 {
		columns = 3
	}
	contentTopY := int32(70)
	contentBottom := rc.Bottom - 8
	availableHeight := contentBottom - contentTopY
	if availableHeight < 120 {
		availableHeight = 120
	}
	rowsPerCol := (len(present) + columns - 1) / columns
	rowHeight := availableHeight / int32(rowsPerCol)
	if rowHeight < 24 {
		rowHeight = 24
	}
	if rowHeight > 58 {
		rowHeight = 58
	}
	colWidth := rc.Right / int32(columns)
	if colWidth < 160 {
		colWidth = 160
	}
	avatarRadius := int32(15)
	if rowHeight > 32 {
		avatarRadius = 19
	}
	contentHeight := contentTopY + int32(rowsPerCol)*rowHeight + 8
	pageHeight := rc.Bottom - rc.Top
	maxPos := scrollMax(contentHeight, pageHeight)
	if app.memberScrollPos > maxPos {
		app.memberScrollPos = maxPos
	}
	applyPaneScroll(hwnd, app.memberScrollPos, contentHeight, pageHeight)
	for i, u := range present {
		col := i / rowsPerCol
		row := i % rowsPerCol
		if col >= columns {
			break
		}
		x0 := int32(col) * colWidth
		y := contentTopY - int32(app.memberScrollPos) + int32(row)*rowHeight
		if y+rowHeight > contentBottom {
			continue
		}
		centerY := y + rowHeight/2
		drawAvatar(hdc, x0+28, centerY, avatarRadius, initialForName(u.Name), app.hFont)
		nameMax := 14
		if columns == 1 {
			nameMax = 18
		}
		name := ellipsizeRunes(u.Name, nameMax)
		drawPaneText(hdc, x0+58, centerY-8, name, app.hFont, clrText)
		stamp := "--:--"
		if !u.LastJoin.IsZero() {
			stamp = u.LastJoin.Format("15:04")
		}
		stampX := x0 + colWidth - 58
		drawPaneText(hdc, stampX, centerY-8, stamp, app.hFont, clrMutedText)
	}
	return 0
}

func paintEventPane(hwnd uintptr, app *guiApp) uintptr {
	hdc, done := beginPanePaint(hwnd)
	if hdc == 0 {
		return 0
	}
	defer done()
	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	fillSolid(hdc, rc, clrPaneBgAlt)
	drawPaneText(hdc, 24, 24, "入退室ログ", app.hFont, clrMutedText)
	drawLine(hdc, 0, 58, rc.Right, 58, clrPaneBorder)

	rows := joinLeaveRowsForCurrentWorld(app)
	pageHeight := rc.Bottom - rc.Top
	contentHeight := eventPaneContentHeight(hwnd, app)
	maxPos := scrollMax(contentHeight, pageHeight)
	if app.eventScrollPos > maxPos {
		app.eventScrollPos = maxPos
	}
	applyPaneScroll(hwnd, app.eventScrollPos, contentHeight, pageHeight)
	y := int32(80 - app.eventScrollPos)
	for _, ev := range rows {
		if y > rc.Bottom-34 {
			break
		}
		color := uint32(clrAccentGreen)
		if !ev.join {
			color = uint32(clrAccentRed)
		}
		icon := "▲"
		if !ev.join {
			icon = "▼"
		}
		drawPaneText(hdc, 24, y, ev.at.Format("15:04:05"), app.hFont, clrMutedText)
		drawPaneText(hdc, 146, y, icon, app.hFont, clrText)
		nameLines := splitDisplayName(ev.name, 8)
		for i, line := range nameLines {
			if i >= 2 {
				break
			}
			drawPaneText(hdc, 186, y+int32(i*28), line, app.hFont, color)
		}
		if len(nameLines) > 1 {
			y += 76
		} else {
			y += 54
		}
	}
	return 0
}

func beginPanePaint(hwnd uintptr) (uintptr, func()) {
	if beginPaintProc == nil || endPaintProc == nil || getClientRectProc == nil {
		return 0, func() {}
	}
	var ps paintStruct
	hdc, _, _ := beginPaintProc.Call(hwnd, uintptr(unsafe.Pointer(&ps)))
	if hdc == 0 {
		return 0, func() {}
	}
	if setBkModeProc != nil {
		setBkModeProc.Call(hdc, 1)
	}
	return hdc, func() { endPaintProc.Call(hwnd, uintptr(unsafe.Pointer(&ps))) }
}

func paintTextPane(hwnd uintptr, app *guiApp, text string) uintptr {
	if app == nil || beginPaintProc == nil || endPaintProc == nil || getClientRectProc == nil {
		return 0
	}
	var ps paintStruct
	hdc, _, _ := beginPaintProc.Call(hwnd, uintptr(unsafe.Pointer(&ps)))
	if hdc == 0 {
		return 0
	}
	defer endPaintProc.Call(hwnd, uintptr(unsafe.Pointer(&ps)))

	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	brush := paneBgBrush
	if brush == 0 && getSysColorBrushProc != nil {
		brush, _, _ = getSysColorBrushProc.Call(5)
	}
	if fillRectProc != nil && brush != 0 {
		fillRectProc.Call(hdc, uintptr(unsafe.Pointer(&rc)), brush)
	}
	if setBkModeProc != nil {
		setBkModeProc.Call(hdc, 1)
	}

	regularFont := app.joinHFont
	if regularFont == 0 {
		regularFont = app.hFont
	}
	boldFont := app.joinBoldHFont
	if boldFont == 0 {
		boldFont = regularFont
	}
	headlineFont := app.joinHeadlineHFont
	if headlineFont == 0 {
		headlineFont = boldFont
	}
	if regularFont == 0 {
		return 0
	}

	var tm textMetric
	lineHeight := int32(joinPaneLineHeight(app.fontSize))
	if getTextMetricsProc != nil {
		if _, _, err := getTextMetricsProc.Call(hdc, uintptr(unsafe.Pointer(&tm))); err == syscall.Errno(0) {
			if tm.Height > 0 {
				lineHeight = tm.Height + tm.ExternalLeading + 1
			}
		}
	}
	if lineHeight < 12 {
		lineHeight = 12
	}

	lines := strings.Split(text, "\n")
	x := int32(10)
	y := int32(8)
	for idx, raw := range lines {
		line := strings.TrimRight(raw, "\r")
		if line == "" {
			y += lineHeight / 2
			continue
		}
		if idx == 0 {
			drawPaneHeadlineLine(hdc, x, y, line, headlineFont, boldFont)
			y += lineHeight + 2
			continue
		}
		switch {
		case strings.HasPrefix(line, "========"):
			drawPaneLine(hdc, x, y, line, regularFont, clrMutedText)
		case strings.Contains(line, "\u25b2"):
			drawPaneLine(hdc, x, y, line, boldFont, clrAccentGreen)
		case strings.Contains(line, "\u25bc"):
			drawPaneLine(hdc, x, y, line, boldFont, clrAccentRed)
		case strings.HasPrefix(line, "\u73fe\u5728\u306e\u30e1\u30f3\u30d0\u30fc") || strings.HasPrefix(line, "\u5165\u9000\u5ba4\u30ed\u30b0") || strings.HasPrefix(line, "\u8a2d\u5b9a") || strings.HasPrefix(line, "\u7ffb\u8a33"):
			drawPaneLine(hdc, x, y, line, boldFont, clrMutedText)
		default:
			drawPaneLine(hdc, x, y, line, regularFont, clrText)
		}
		y += lineHeight
		if y > rc.Bottom-10 {
			break
		}
	}
	return 0
}

func drawPaneHeadlineLine(hdc uintptr, x, y int32, text string, headlineFont, fallbackFont uintptr) {
	if headlineFont == 0 {
		headlineFont = fallbackFont
	}
	if headlineFont == 0 {
		return
	}
	drawPaneText(hdc, x, y, text, headlineFont, 0x008000)
}

func drawPaneLine(hdc uintptr, x, y int32, text string, font uintptr, color uint32) {
	drawPaneText(hdc, x, y, text, font, color)
}

func drawSettingsWideButton(hdc uintptr, rc winRect, label, value string, font uintptr, active bool) {
	fill := uint32(0x00443120)
	border := uint32(clrPaneBorder)
	valueColor := uint32(clrMutedText)
	if active {
		fill = 0x00183f16
		border = clrAccentGreen
		valueColor = clrAccentGreen
	}
	drawSettingsBox(hdc, rc, fill, border)
	drawPaneText(hdc, rc.Left+18, rc.Top+10, label, font, clrText)
	valueWidth := int32(len(value) * 10)
	drawPaneText(hdc, rc.Right-18-valueWidth, rc.Top+10, value, font, valueColor)
}

func drawSettingsFontControl(hdc uintptr, app *guiApp) {
	font := app.hFont
	fill := uint32(0x00443120)
	border := uint32(clrPaneBorder)
	drawSettingsBox(hdc, settingsFontDownRect(), fill, border)
	drawSettingsBox(hdc, settingsFontValueRect(), uint32(0x0038281a), border)
	drawSettingsBox(hdc, settingsFontUpRect(), fill, border)
	drawCenteredPaneText(hdc, settingsFontDownRect(), "A-", font, clrText)
	drawCenteredPaneText(hdc, settingsFontValueRect(), strconv.Itoa(app.fontSize), font, clrMutedText)
	drawCenteredPaneText(hdc, settingsFontUpRect(), "A+", font, clrText)
}

func drawSettingsBox(hdc uintptr, rc winRect, fill, border uint32) {
	fillSolid(hdc, rc, fill)
	drawLine(hdc, rc.Left, rc.Top, rc.Right, rc.Top, border)
	drawLine(hdc, rc.Left, rc.Bottom, rc.Right, rc.Bottom, border)
	drawLine(hdc, rc.Left, rc.Top, rc.Left, rc.Bottom, border)
	drawLine(hdc, rc.Right, rc.Top, rc.Right, rc.Bottom, border)
}

func drawCenteredPaneText(hdc uintptr, rc winRect, text string, font uintptr, color uint32) {
	width := int32(len([]rune(text)) * 10)
	if getTextExtentPoint32Proc != nil {
		buf := syscall.StringToUTF16(text)
		if len(buf) > 1 {
			var sz textSize
			getTextExtentPoint32Proc.Call(hdc, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)-1), uintptr(unsafe.Pointer(&sz)))
			if sz.Cx > 0 {
				width = sz.Cx
			}
		}
	}
	x := rc.Left + ((rc.Right - rc.Left - width) / 2)
	if x < rc.Left+4 {
		x = rc.Left + 4
	}
	drawPaneText(hdc, x, rc.Top+10, text, font, color)
}

func drawPaneText(hdc uintptr, x, y int32, text string, font uintptr, color uint32) int32 {
	if textOutProc == nil || selectObjectProc == nil || setTextColorProc == nil {
		return 0
	}
	prevFont, _, _ := selectObjectProc.Call(hdc, font)
	defer selectObjectProc.Call(hdc, prevFont)
	setTextColorProc.Call(hdc, uintptr(color))
	buf := syscall.StringToUTF16(text)
	if len(buf) <= 1 {
		return 0
	}
	textOutProc.Call(hdc, uintptr(x), uintptr(y), uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)-1))
	if getTextExtentPoint32Proc == nil {
		return int32(len(text) * 8)
	}
	var sz textSize
	getTextExtentPoint32Proc.Call(hdc, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)-1), uintptr(unsafe.Pointer(&sz)))
	if sz.Cx <= 0 {
		return int32(len(text) * 8)
	}
	return sz.Cx
}

func tabColor(active bool) uint32 {
	if active {
		return clrText
	}
	return clrMutedText
}

func tabLabelColor(active, enabled bool) uint32 {
	if !enabled {
		return clrMutedText
	}
	return tabColor(active)
}

func fillSolid(hdc uintptr, rc winRect, color uint32) {
	if fillRectProc == nil || createSolidBrushProc == nil {
		return
	}
	brush, _, _ := createSolidBrushProc.Call(uintptr(color))
	if brush == 0 {
		return
	}
	fillRectProc.Call(hdc, uintptr(unsafe.Pointer(&rc)), brush)
	if deleteObjectProc != nil {
		deleteObjectProc.Call(brush)
	}
}

func drawLine(hdc uintptr, x1, y1, x2, y2 int32, color uint32) {
	if createPenProc == nil || selectObjectProc == nil || moveToExProc == nil || lineToProc == nil {
		return
	}
	pen, _, _ := createPenProc.Call(0, 1, uintptr(color))
	if pen == 0 {
		return
	}
	old, _, _ := selectObjectProc.Call(hdc, pen)
	moveToExProc.Call(hdc, uintptr(x1), uintptr(y1), 0)
	lineToProc.Call(hdc, uintptr(x2), uintptr(y2))
	selectObjectProc.Call(hdc, old)
	if deleteObjectProc != nil {
		deleteObjectProc.Call(pen)
	}
}

func drawWindowDot(hdc uintptr, cx, cy int32, color uint32) {
	drawFilledEllipse(hdc, cx-10, cy-10, cx+10, cy+10, color)
}

func drawAvatar(hdc uintptr, cx, cy, radius int32, label string, font uintptr) {
	if radius <= 0 {
		radius = 23
	}
	drawFilledEllipse(hdc, cx-radius, cy-radius, cx+radius, cy+radius, clrAvatarBg)
	if strings.TrimSpace(label) != "" {
		drawPaneText(hdc, cx-8, cy-10, label, font, clrText)
	}
}

func memberRowHeight(rc winRect, count int) int32 {
	if count <= 0 {
		return 58
	}
	available := rc.Bottom - 72
	if available <= 0 {
		return 58
	}
	row := available / int32(count)
	if row > 64 {
		return 64
	}
	minRow := int32(42)
	if count > 32 {
		minRow = 24
	} else if count > 24 {
		minRow = 32
	}
	if row < minRow {
		return minRow
	}
	return row
}

func drawFilledEllipse(hdc uintptr, left, top, right, bottom int32, color uint32) {
	if ellipseProc == nil || createSolidBrushProc == nil || selectObjectProc == nil {
		return
	}
	brush, _, _ := createSolidBrushProc.Call(uintptr(color))
	if brush == 0 {
		return
	}
	oldBrush, _, _ := selectObjectProc.Call(hdc, brush)
	ellipseProc.Call(hdc, uintptr(left), uintptr(top), uintptr(right), uintptr(bottom))
	selectObjectProc.Call(hdc, oldBrush)
	if deleteObjectProc != nil {
		deleteObjectProc.Call(brush)
	}
}

func initialForName(name string) string {
	name = strings.TrimSpace(name)
	if name == "" {
		return "?"
	}
	for _, r := range name {
		if r == '[' || r == ']' || r == '(' || r == ')' || r == ' ' {
			continue
		}
		return string(r)
	}
	return "?"
}

func splitDisplayName(name string, width int) []string {
	name = strings.TrimSpace(name)
	if name == "" {
		return []string{""}
	}
	if width <= 0 {
		width = 8
	}
	runes := []rune(name)
	if len(runes) <= width {
		return []string{name}
	}
	out := make([]string, 0, 2)
	for len(runes) > 0 && len(out) < 2 {
		n := width
		if len(runes) < n {
			n = len(runes)
		}
		out = append(out, string(runes[:n]))
		runes = runes[n:]
	}
	return out
}

func ellipsizeRunes(text string, limit int) string {
	text = strings.TrimSpace(text)
	if limit <= 0 {
		return text
	}
	runes := []rune(text)
	if len(runes) <= limit {
		return text
	}
	if limit <= 1 {
		return string(runes[:limit])
	}
	return string(runes[:limit-1]) + "…"
}

func ellipsizeTextToWidth(hdc uintptr, text string, maxWidth int32, font uintptr) string {
	text = strings.TrimSpace(text)
	if text == "" || maxWidth <= 0 {
		return ""
	}
	if measureTextWidth(hdc, text, font) <= maxWidth {
		return text
	}
	runes := []rune(text)
	if len(runes) <= 1 {
		return "..."
	}
	lo, hi := 1, len(runes)
	best := "..."
	for lo <= hi {
		mid := (lo + hi) / 2
		cand := string(runes[:mid]) + "..."
		if measureTextWidth(hdc, cand, font) <= maxWidth {
			best = cand
			lo = mid + 1
		} else {
			hi = mid - 1
		}
	}
	return best
}

func measureTextWidth(hdc uintptr, text string, font uintptr) int32 {
	if text == "" {
		return 0
	}
	if selectObjectProc == nil || getTextExtentPoint32Proc == nil {
		return int32(len([]rune(text)) * 10)
	}
	buf := syscall.StringToUTF16(text)
	if len(buf) <= 1 {
		return 0
	}
	prevFont, _, _ := selectObjectProc.Call(hdc, font)
	defer selectObjectProc.Call(hdc, prevFont)
	var sz textSize
	getTextExtentPoint32Proc.Call(hdc, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)-1), uintptr(unsafe.Pointer(&sz)))
	if sz.Cx <= 0 {
		return int32(len([]rune(text)) * 10)
	}
	return sz.Cx
}

type guiEventRow struct {
	at   time.Time
	name string
	join bool
}

func eventRows(users []userState) []guiEventRow {
	rows := make([]guiEventRow, 0, len(users))
	for _, u := range users {
		if u.Present {
			if !u.LastJoin.IsZero() {
				rows = append(rows, guiEventRow{at: u.LastJoin, name: u.Name, join: true})
			}
			continue
		}
		if !u.LastLeave.IsZero() {
			rows = append(rows, guiEventRow{at: u.LastLeave, name: u.Name, join: false})
		}
	}
	sort.SliceStable(rows, func(i, j int) bool {
		if rows[i].at.Equal(rows[j].at) {
			return strings.ToLower(rows[i].name) < strings.ToLower(rows[j].name)
		}
		return rows[i].at.After(rows[j].at)
	})
	return rows
}

func joinLeaveRowsForCurrentWorld(app *guiApp) []guiEventRow {
	events := historyEventsFromSnapshot()
	if len(events) == 0 {
		users, _ := currentUsersFromJoinLeave()
		return eventRows(users)
	}
	since := currentWorldSinceFromRuntime()
	if since.IsZero() {
		since = currentWorldStartTime()
	}
	rows := make([]guiEventRow, 0, len(events))
	for _, ev := range events {
		if ev.At.IsZero() {
			continue
		}
		if !since.IsZero() && ev.At.Before(since) {
			continue
		}
		rows = append(rows, guiEventRow{
			at:   ev.At,
			name: ev.Name,
			join: strings.EqualFold(ev.Kind, "join"),
		})
	}
	if len(rows) == 0 {
		users, _ := currentUsersFromJoinLeave()
		return eventRows(users)
	}
	sort.SliceStable(rows, func(i, j int) bool {
		if rows[i].at.Equal(rows[j].at) {
			if rows[i].join != rows[j].join {
				return rows[i].join
			}
			return strings.ToLower(rows[i].name) < strings.ToLower(rows[j].name)
		}
		return rows[i].at.After(rows[j].at)
	})
	return rows
}

type guiWorldVisitRow struct {
	Label     string
	StartedAt time.Time
	EndedAt   time.Time
	Current   bool
}

func historyRows() []guiWorldVisitRow {
	rows := make([]guiWorldVisitRow, 0, 16)
	if label, since, ok := currentWorldVisitInfo(); ok {
		rows = append(rows, guiWorldVisitRow{
			Label:     label,
			StartedAt: since,
			Current:   true,
		})
	}
	for _, visit := range readWorldHistory() {
		rows = append(rows, guiWorldVisitRow{
			Label:     visit.WorldLabel,
			StartedAt: visit.StartedAt,
			EndedAt:   visit.EndedAt,
		})
	}
	sort.SliceStable(rows, func(i, j int) bool {
		ti := rows[i].EndedAt
		if ti.IsZero() {
			ti = rows[i].StartedAt
		}
		tj := rows[j].EndedAt
		if tj.IsZero() {
			tj = rows[j].StartedAt
		}
		if ti.Equal(tj) {
			return strings.ToLower(rows[i].Label) < strings.ToLower(rows[j].Label)
		}
		return ti.After(tj)
	})
	return rows
}

func historyPaneContentHeight(hwnd uintptr, app *guiApp) int32 {
	if app == nil || getClientRectProc == nil {
		return 0
	}
	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	rows := app.historyRows
	if rows == nil {
		return 120
	}
	contentHeight := int32(84 + len(rows)*38)
	if contentHeight < 120 {
		contentHeight = 120
	}
	return contentHeight
}

func paintHistoryPane(hwnd uintptr, app *guiApp) uintptr {
	hdc, done := beginPanePaint(hwnd)
	if hdc == 0 {
		return 0
	}
	defer done()

	var rc winRect
	getClientRectProc.Call(hwnd, uintptr(unsafe.Pointer(&rc)))
	fillSolid(hdc, rc, clrPaneBgAlt)
	drawPaneText(hdc, 24, 24, "ワールド訪問履歴", app.joinBoldHFont, clrAccentGreen)
	drawLine(hdc, 0, 58, rc.Right, 58, clrPaneBorder)

	rows := app.historyRows
	if rows == nil {
		rows = []guiWorldVisitRow{}
	}
	pageHeight := rc.Bottom - rc.Top
	contentHeight := historyPaneContentHeight(hwnd, app)
	maxPos := scrollMax(contentHeight, pageHeight)
	if app.historyScrollPos > maxPos {
		app.historyScrollPos = maxPos
	}
	applyPaneScroll(hwnd, app.historyScrollPos, contentHeight, pageHeight)

	y := int32(82 - app.historyScrollPos)
	for _, row := range rows {
		if y > rc.Bottom-30 {
			break
		}
		color := uint32(clrText)
		font := app.hFont
		if row.Current {
			color = uint32(clrAccentGreen)
			font = app.joinBoldHFont
		}
		started := row.StartedAt
		ended := row.EndedAt
		if ended.IsZero() {
			ended = time.Now()
		}
		label := ellipsizeTextToWidth(hdc, strings.TrimSpace(row.Label), rc.Right-292, font)
		timeLabel := started.Format("15:04")
		if row.Current {
			timeLabel = started.Format("15:04") + "  継続中"
		} else if !row.EndedAt.IsZero() {
			timeLabel = started.Format("15:04") + " - " + row.EndedAt.Format("15:04")
		}
		drawPaneText(hdc, 24, y, "["+timeLabel+"]", app.hFont, clrMutedText)
		drawPaneText(hdc, 150, y, label, font, color)
		drawPaneText(hdc, rc.Right-132, y, humanDurationLabel(started, ended, row.Current), app.hFont, clrMutedText)
		y += 38
	}
	return 0
}

type guiWorldVisitRecord struct {
	WorldLabel string    `json:"world_label"`
	WorldID    string    `json:"world_id"`
	InstanceID string    `json:"instance_id"`
	StartedAt  time.Time `json:"started_at"`
	EndedAt    time.Time `json:"ended_at"`
}

type guiWorldHistoryFile struct {
	UpdatedAt string                `json:"updated_at"`
	Visits    []guiWorldVisitRecord `json:"visits"`
}

func readWorldHistory() []guiWorldVisitRecord {
	p := filepath.Join(runtimeDir(), "world_history.json")
	info, err := os.Stat(p)
	if err == nil {
		worldHistoryCacheMu.Lock()
		if worldHistoryCache.modTime.Equal(info.ModTime()) && worldHistoryCache.size == info.Size() && worldHistoryCache.items != nil {
			out := append([]guiWorldVisitRecord(nil), worldHistoryCache.items...)
			worldHistoryCacheMu.Unlock()
			return out
		}
		worldHistoryCacheMu.Unlock()
	}
	b, err := os.ReadFile(p)
	if err != nil || len(b) == 0 {
		return nil
	}
	var visits []guiWorldVisitRecord
	if err := json.Unmarshal(b, &visits); err != nil {
		var snap guiWorldHistoryFile
		if err := json.Unmarshal(b, &snap); err != nil {
			return nil
		}
		visits = snap.Visits
	}
	out := dedupeWorldHistory(visits)
	if info, err := os.Stat(p); err == nil {
		worldHistoryCacheMu.Lock()
		worldHistoryCache.modTime = info.ModTime()
		worldHistoryCache.size = info.Size()
		worldHistoryCache.items = append([]guiWorldVisitRecord(nil), out...)
		worldHistoryCacheMu.Unlock()
	}
	return out
}

func dedupeWorldHistory(visits []guiWorldVisitRecord) []guiWorldVisitRecord {
	if len(visits) <= 1 {
		return visits
	}
	type bucket struct {
		visit guiWorldVisitRecord
	}
	seen := make(map[string]int, len(visits))
	out := make([]bucket, 0, len(visits))
	for _, visit := range visits {
		key := visit.WorldLabel + "|" + visit.WorldID + "|" + visit.InstanceID + "|" + visit.StartedAt.UTC().Format(time.RFC3339Nano)
		if idx, ok := seen[key]; ok {
			if visit.EndedAt.After(out[idx].visit.EndedAt) {
				out[idx].visit.EndedAt = visit.EndedAt
			}
			if strings.TrimSpace(out[idx].visit.WorldLabel) == "" && strings.TrimSpace(visit.WorldLabel) != "" {
				out[idx].visit.WorldLabel = visit.WorldLabel
			}
			continue
		}
		seen[key] = len(out)
		out = append(out, bucket{visit: visit})
	}
	sort.SliceStable(out, func(i, j int) bool {
		ti := out[i].visit.EndedAt
		if ti.IsZero() {
			ti = out[i].visit.StartedAt
		}
		tj := out[j].visit.EndedAt
		if tj.IsZero() {
			tj = out[j].visit.StartedAt
		}
		if ti.Equal(tj) {
			return strings.ToLower(out[i].visit.WorldLabel) < strings.ToLower(out[j].visit.WorldLabel)
		}
		return ti.After(tj)
	})
	merged := make([]guiWorldVisitRecord, 0, len(out))
	for _, item := range out {
		merged = append(merged, item.visit)
	}
	return merged
}

func currentWorldVisitInfo() (string, time.Time, bool) {
	if !vrchatProcessRunning() {
		return "", time.Time{}, false
	}
	state := readRuntimeSnapshot()
	label := strings.TrimSpace(stateString(state, "world"))
	sinceText := strings.TrimSpace(stateString(state, "world_since"))
	if label != "" && sinceText != "" {
		if since, err := time.Parse(time.RFC3339, sinceText); err == nil {
			return label, since, true
		}
	}
	if label != "" {
		return label, time.Now(), true
	}
	if tailLabel, tailSince := currentWorldVisitFromVRChatLog(); tailLabel != "" && !tailSince.IsZero() {
		return tailLabel, tailSince, true
	}
	return "", time.Time{}, false
}

func currentWorldVisitFromVRChatLog() (string, time.Time) {
	logPath, err := findLatestVRChatLog()
	if err != nil {
		return "", time.Time{}
	}
	b, err := readFileTail(logPath, guiLogTailBytes)
	if err != nil || len(b) == 0 {
		return "", time.Time{}
	}
	text := appPkg.DecodeVRChatLog(b)
	if strings.TrimSpace(text) == "" {
		return "", time.Time{}
	}
	state := &worldState{}
	latestLabel := ""
	latestTime := time.Time{}
	for _, raw := range strings.Split(text, "\n") {
		line := strings.TrimSpace(strings.TrimRight(raw, "\r"))
		if line == "" {
			continue
		}
		at := parseLogTime(line)
		if changed, label := updateWorldState(state, line); changed {
			if shouldPreferWorldCandidate(label, latestLabel) {
				latestLabel = label
				latestTime = at
			}
			continue
		}
		candidate := ""
		if strings.Contains(line, "Memory Usage: after world loaded") {
			if m := worldPattern.FindStringSubmatch(line); len(m) == 2 {
				candidate = strings.TrimSpace(m[1])
			}
		}
		if candidate == "" {
			if m := enteringRoomPattern.FindStringSubmatch(line); len(m) == 2 {
				candidate = strings.TrimSpace(m[1])
			}
		}
		if candidate == "" {
			if m := worldNamePattern.FindStringSubmatch(line); len(m) == 2 {
				candidate = strings.TrimSpace(m[1])
			}
		}
		if candidate == "" {
			continue
		}
		if !shouldPreferWorldCandidate(candidate, latestLabel) {
			continue
		}
		if at.IsZero() || latestTime.IsZero() || !at.Before(latestTime) {
			latestLabel = candidate
			if !at.IsZero() {
				latestTime = at
			}
		}
	}
	return latestLabel, latestTime
}

func shouldPreferWorldCandidate(candidate, current string) bool {
	candidate = strings.TrimSpace(candidate)
	current = strings.TrimSpace(current)
	if candidate == "" {
		return false
	}
	if strings.HasPrefix(strings.ToLower(candidate), "wrld_") && current != "" && !strings.HasPrefix(strings.ToLower(current), "wrld_") {
		return false
	}
	return true
}

func humanDurationLabel(started, ended time.Time, current bool) string {
	if started.IsZero() {
		return "0 min"
	}
	if ended.IsZero() {
		ended = time.Now()
	}
	if ended.Before(started) {
		ended = started
	}
	d := ended.Sub(started)
	if current {
		return formatDurationShort(d) + " active"
	}
	return formatDurationShort(d)
}

func formatDurationShort(d time.Duration) string {
	if d < time.Minute {
		return "<1 min"
	}
	minutes := int(d.Minutes())
	hours := minutes / 60
	mins := minutes % 60
	switch {
	case hours > 0 && mins > 0:
		return fmt.Sprintf("%dh%dm", hours, mins)
	case hours > 0:
		return fmt.Sprintf("%dh", hours)
	default:
		return fmt.Sprintf("%dm", mins)
	}
}

func joinLogFontSize(baseSize, presentCount int) int {
	size := baseSize
	if size <= 0 {
		size = defaultGUIFontSize
	}
	if presentCount <= 32 {
		return size
	}
	switch {
	case presentCount >= 40:
		size -= 6
	case presentCount >= 36:
		size -= 4
	case presentCount >= 33:
		size -= 2
	}
	if size < minGUIFontSize {
		size = minGUIFontSize
	}
	return size
}

func allowRapidSettingsAction(app *guiApp) bool {
	if app == nil {
		return false
	}
	now := time.Now()
	if !app.lastSettingsAction.IsZero() && now.Sub(app.lastSettingsAction) < 150*time.Millisecond {
		guiLog("settings action skipped: debounce")
		return false
	}
	app.lastSettingsAction = now
	return true
}

func allowRapidTabAction(app *guiApp) bool {
	if app == nil {
		return false
	}
	now := time.Now()
	if !app.lastTabAction.IsZero() && now.Sub(app.lastTabAction) < 120*time.Millisecond {
		guiLog("tab change skipped: debounce")
		return false
	}
	app.lastTabAction = now
	return true
}

func currentUsersFromJoinLeave() ([]userState, int) {
	if out, ok := currentUsersFromGuestSnapshot(); ok {
		guiLog(fmt.Sprintf("currentUsers source=guest_snapshot count=%d total=%d", countPresent(out), len(out)))
		return out, countPresent(out)
	}

	if out, ok := currentUsersFromJoinLeaveSnapshot(); ok {
		guiLog(fmt.Sprintf("currentUsers source=join_leave_snapshot count=%d total=%d", countPresent(out), len(out)))
		return out, countPresent(out)
	}

	if out, ok := currentUsersFromVRChatLog(); ok {
		guiLog(fmt.Sprintf("currentUsers source=vrc_log count=%d total=%d", countPresent(out), len(out)))
		return out, countPresent(out)
	}

	guiLog("currentUsers source=none")
	return nil, 0
}

func currentUsersFromGuestSnapshot() ([]userState, bool) {
	snap := readGuestSnapshot()
	if len(snap) == 0 {
		return nil, false
	}
	out := make([]userState, 0, len(snap))
	for _, s := range snap {
		out = append(out, userState{
			Name:      s.Name,
			Present:   s.Present,
			LastJoin:  s.LastJoin,
			LastLeave: s.LastLeave,
		})
	}
	sort.Slice(out, func(i, j int) bool {
		if out[i].Present != out[j].Present {
			return out[i].Present
		}
		if out[i].LastLeave.Equal(out[j].LastLeave) {
			return strings.ToLower(out[i].Name) < strings.ToLower(out[j].Name)
		}
		return out[i].LastLeave.After(out[j].LastLeave)
	})
	return out, true
}

func currentUsersFromJoinLeaveSnapshot() ([]userState, bool) {
	since := currentWorldSinceFromRuntime()
	if since.IsZero() {
		return nil, false
	}
	events := readJoinLeaveEventsSnapshot()
	if len(events) == 0 {
		return nil, false
	}
	users := map[string]*userState{}
	for _, ev := range events {
		if ev.At.IsZero() || ev.At.Before(since) {
			continue
		}
		name := strings.TrimSpace(ev.Name)
		if name == "" {
			continue
		}
		u := users[name]
		if u == nil {
			u = &userState{Name: name}
			users[name] = u
		}
		switch ev.Kind {
		case "join":
			u.Present = true
			u.LastJoin = ev.At
		case "leave":
			u.Present = false
			u.LastLeave = ev.At
		}
	}
	if len(users) == 0 {
		return nil, false
	}
	return sortUserStates(users), true
}

func currentUsersFromVRChatLog() ([]userState, bool) {
	logPath, err := findLatestVRChatLog()
	if err != nil {
		return nil, false
	}
	b, err := readFileTail(logPath, guiLogTailBytes)
	if err != nil || len(b) == 0 {
		return nil, false
	}
	text := appPkg.DecodeVRChatLog(b)
	if strings.TrimSpace(text) == "" {
		return nil, false
	}
	users := map[string]*userState{}
	lines := strings.Split(text, "\n")
	for _, raw := range lines {
		line := strings.TrimSpace(raw)
		if line == "" {
			continue
		}
		if strings.Contains(line, "Entering Room") || strings.Contains(line, "Joining or Creating Room") {
			users = map[string]*userState{}
			continue
		}
		at := parseLogTime(line)
		if m := vrcJoinPattern.FindStringSubmatch(line); len(m) == 2 {
			name := strings.TrimSpace(m[1])
			u := users[name]
			if u == nil {
				u = &userState{Name: name}
				users[name] = u
			}
			u.Present = true
			if !at.IsZero() {
				u.LastJoin = at
			}
			continue
		}
		if m := vrcLeftPattern.FindStringSubmatch(line); len(m) == 2 {
			name := strings.TrimSpace(m[1])
			u := users[name]
			if u == nil {
				u = &userState{Name: name}
				users[name] = u
			}
			u.Present = false
			if !at.IsZero() {
				u.LastLeave = at
			}
		}
	}
	return sortUserStates(users), len(users) > 0
}

func currentWorldSinceFromRuntime() time.Time {
	if !vrchatProcessRunning() {
		return time.Time{}
	}
	state := readRuntimeSnapshot()
	sinceText := strings.TrimSpace(stateString(state, "world_since"))
	if sinceText == "" {
		return time.Time{}
	}
	since, err := time.Parse(time.RFC3339, sinceText)
	if err != nil {
		return time.Time{}
	}
	return since
}

func readJoinLeaveEventsSnapshot() []joinLeaveEventSnapshot {
	jsonPath := filepath.Join(runtimeDir(), "join_leave_events.json")
	logPath := filepath.Join(runtimeDir(), "join_leave.log")
	jsonInfo, jsonErr := os.Stat(jsonPath)
	logInfo, logErr := os.Stat(logPath)
	if jsonErr == nil || logErr == nil {
		joinLeaveEventsCacheMu.Lock()
		if joinLeaveEventsCache.items != nil &&
			((jsonErr == nil && joinLeaveEventsCache.jsonMod.Equal(jsonInfo.ModTime()) && joinLeaveEventsCache.jsonSize == jsonInfo.Size()) || jsonErr != nil) &&
			((logErr == nil && joinLeaveEventsCache.logMod.Equal(logInfo.ModTime()) && joinLeaveEventsCache.logSize == logInfo.Size()) || logErr != nil) {
			out := append([]joinLeaveEventSnapshot(nil), joinLeaveEventsCache.items...)
			joinLeaveEventsCacheMu.Unlock()
			return out
		}
		joinLeaveEventsCacheMu.Unlock()
	}
	if events := readJoinLeaveEventsSnapshotFromJSON(jsonPath); len(events) > 0 {
		if jsonErr == nil {
			joinLeaveEventsCacheMu.Lock()
			joinLeaveEventsCache.jsonMod = jsonInfo.ModTime()
			joinLeaveEventsCache.jsonSize = jsonInfo.Size()
			joinLeaveEventsCache.logMod = time.Time{}
			joinLeaveEventsCache.logSize = 0
			joinLeaveEventsCache.items = append([]joinLeaveEventSnapshot(nil), events...)
			joinLeaveEventsCacheMu.Unlock()
		}
		return events
	}
	events := readJoinLeaveEventsSnapshotFromLog(logPath)
	if logErr == nil {
		joinLeaveEventsCacheMu.Lock()
		joinLeaveEventsCache.jsonMod = time.Time{}
		joinLeaveEventsCache.jsonSize = 0
		joinLeaveEventsCache.logMod = logInfo.ModTime()
		joinLeaveEventsCache.logSize = logInfo.Size()
		joinLeaveEventsCache.items = append([]joinLeaveEventSnapshot(nil), events...)
		joinLeaveEventsCacheMu.Unlock()
	}
	return events
}

func readJoinLeaveEventsSnapshotFromJSON(path string) []joinLeaveEventSnapshot {
	b, err := os.ReadFile(path)
	if err != nil || len(b) == 0 {
		return nil
	}
	type snapshot struct {
		UpdatedAt time.Time `json:"updated_at"`
		Events    []struct {
			At    time.Time `json:"at"`
			Kind  string    `json:"kind"`
			Name  string    `json:"name"`
			Count int       `json:"count"`
		} `json:"events"`
	}
	var snap snapshot
	if err := json.Unmarshal(b, &snap); err != nil || len(snap.Events) == 0 {
		var flat []joinLeaveEventSnapshot
		if err := json.Unmarshal(b, &flat); err == nil && len(flat) > 0 {
			return flat
		}
		return nil
	}
	out := make([]joinLeaveEventSnapshot, 0, len(snap.Events))
	for _, ev := range snap.Events {
		out = append(out, joinLeaveEventSnapshot{
			At:    ev.At,
			Kind:  ev.Kind,
			Name:  ev.Name,
			Count: ev.Count,
		})
	}
	return out
}

func readJoinLeaveEventsSnapshotFromLog(path string) []joinLeaveEventSnapshot {
	b, err := os.ReadFile(path)
	if err != nil || len(b) == 0 {
		return nil
	}
	events := make([]joinLeaveEventSnapshot, 0, 256)
	var currentAt time.Time
	for _, raw := range strings.Split(string(b), "\n") {
		line := strings.TrimSpace(strings.TrimRight(raw, "\r"))
		if line == "" {
			continue
		}
		if strings.Contains(line, "VRC JOIN/LEAVE") {
			if at, ok := parseRuntimeTime(line); ok {
				currentAt = at
			}
			continue
		}
		m := joinLeaveBodyPattern.FindStringSubmatch(line)
		if len(m) != 4 {
			continue
		}
		count, _ := strconv.Atoi(m[3])
		events = append(events, joinLeaveEventSnapshot{
			At:    currentAt,
			Kind:  m[1],
			Name:  strings.TrimSpace(m[2]),
			Count: count,
		})
	}
	return events
}

func sortUserStates(users map[string]*userState) []userState {
	out := make([]userState, 0, len(users))
	for _, u := range users {
		out = append(out, *u)
	}
	sort.Slice(out, func(i, j int) bool {
		if out[i].Present != out[j].Present {
			return out[i].Present
		}
		if out[i].LastLeave.Equal(out[j].LastLeave) {
			return strings.ToLower(out[i].Name) < strings.ToLower(out[j].Name)
		}
		return out[i].LastLeave.After(out[j].LastLeave)
	})
	return out
}

func parseLogTime(line string) time.Time {
	m := vrcLogTimePattern.FindStringSubmatch(line)
	if len(m) != 2 {
		return time.Time{}
	}
	at, err := time.Parse("2006.01.02 15:04:05", m[1])
	if err != nil {
		return time.Time{}
	}
	return at
}

func findLatestVRChatLog() (string, error) {
	dir := filepath.Join(os.Getenv("USERPROFILE"), "AppData", "LocalLow", "VRChat", "VRChat")
	entries, err := os.ReadDir(dir)
	if err != nil {
		return "", err
	}
	var latest string
	var latestMod time.Time
	for _, entry := range entries {
		if entry.IsDir() {
			continue
		}
		name := entry.Name()
		if !strings.HasSuffix(strings.ToLower(name), ".log") && !strings.HasSuffix(strings.ToLower(name), ".txt") {
			continue
		}
		info, err := entry.Info()
		if err != nil {
			continue
		}
		if info.Size() == 0 {
			continue
		}
		if info.ModTime().After(latestMod) {
			latestMod = info.ModTime()
			latest = filepath.Join(dir, name)
		}
	}
	if latest == "" {
		return "", os.ErrNotExist
	}
	return latest, nil
}

func readGuestSnapshot() []appPkg.GuestStatus {
	p := filepath.Join(runtimeDir(), "guest_snapshot.json")
	info, err := os.Stat(p)
	if err == nil {
		guestSnapshotCacheMu.Lock()
		if guestSnapshotCache.modTime.Equal(info.ModTime()) && guestSnapshotCache.size == info.Size() && guestSnapshotCache.items != nil {
			out := append([]appPkg.GuestStatus(nil), guestSnapshotCache.items...)
			guestSnapshotCacheMu.Unlock()
			return out
		}
		guestSnapshotCacheMu.Unlock()
	}
	b, err := readFileTail(p, guiLogTailBytes)
	if err != nil {
		return nil
	}
	var out []appPkg.GuestStatus
	if err := json.Unmarshal(b, &out); err != nil {
		return nil
	}
	if info, err := os.Stat(p); err == nil {
		guestSnapshotCacheMu.Lock()
		guestSnapshotCache.modTime = info.ModTime()
		guestSnapshotCache.size = info.Size()
		guestSnapshotCache.items = append([]appPkg.GuestStatus(nil), out...)
		guestSnapshotCacheMu.Unlock()
	}
	return out
}

func buildGuestPaneText(worldLabel string, items []userState) string {
	var b strings.Builder
	headline := strings.TrimSpace(worldLabel)
	if headline == "" {
		headline = "(unknown)"
	}
	headline = headline + " (" + strconv.Itoa(countPresent(items)) + ")"
	b.WriteString(headline)
	b.WriteString("\r\n")
	b.WriteString("\u73fe\u5728\u306e\u30e1\u30f3\u30d0\u30fc")
	b.WriteString("\r\n")
	present := make([]userState, 0, len(items))
	for _, item := range items {
		if item.Present {
			present = append(present, item)
		}
	}
	sort.SliceStable(present, func(i, j int) bool {
		if present[i].LastJoin.IsZero() != present[j].LastJoin.IsZero() {
			return !present[i].LastJoin.IsZero()
		}
		if present[i].LastJoin.Equal(present[j].LastJoin) {
			return strings.ToLower(present[i].Name) < strings.ToLower(present[j].Name)
		}
		return present[i].LastJoin.After(present[j].LastJoin)
	})
	for _, item := range present {
		stamp := "--:--"
		if !item.LastJoin.IsZero() {
			stamp = item.LastJoin.Format("15:04")
		}
		b.WriteString("[")
		b.WriteString(stamp)
		b.WriteString("] ")
		b.WriteString(item.Name)
		b.WriteString("\r\n")
	}
	return strings.TrimRight(b.String(), "\r\n")
}

func formatGuestPane(title, worldLabel string, items []userState) string {
	text := buildGuestPaneText(worldLabel, items)
	if err := appPkg.AppendDesktopJoinLog(title, worldLabel, text); err != nil {
		_ = appPkg.AppendRuntimeLog("GUI JOIN LOG WRITE FAIL", err.Error())
	}
	return text
}
func currentSelfName() string {
	if cfg, err := config.Load(""); err == nil && cfg != nil {
		if name := strings.TrimSpace(cfg.VrcLog.SelfName); name != "" {
			return name
		}
	}
	cwd, err := os.Getwd()
	if err != nil {
		return ""
	}
	cfg, err := config.Load(filepath.Join(cwd, "config", "config.toml"))
	if err != nil || cfg == nil {
		return ""
	}
	return strings.TrimSpace(cfg.VrcLog.SelfName)
}

func loadGUISettings() config.GUIConfig {
	cfg, err := config.Load("")
	if err != nil || cfg == nil {
		return config.GUIConfig{
			TopMost:                       false,
			FontSize:                      defaultGUIFontSize,
			RefreshIntervalValue:          2,
			RefreshIntervalUnit:           "sec",
			HistoryExportIncludeTime:      true,
			HistoryExportIncludeWorld:     true,
			HistoryExportIncludeJoinLeave: true,
		}
	}
	if cfg.GUI.FontSize <= 0 {
		cfg.GUI.FontSize = defaultGUIFontSize
	}
	cfg.GUI.RefreshIntervalValue, cfg.GUI.RefreshIntervalUnit = normalizeRefreshIntervalSettings(cfg.GUI.RefreshIntervalValue, cfg.GUI.RefreshIntervalUnit)
	cfg.GUI.HistoryRegex = strings.TrimSpace(cfg.GUI.HistoryRegex)
	cfg.GUI.HistoryFromDate = strings.TrimSpace(cfg.GUI.HistoryFromDate)
	cfg.GUI.HistoryToDate = strings.TrimSpace(cfg.GUI.HistoryToDate)
	cfg.GUI.HistoryExportDir = strings.TrimSpace(cfg.GUI.HistoryExportDir)
	cfg.GUI.HistoryExportCustom = strings.TrimSpace(cfg.GUI.HistoryExportCustom)
	return cfg.GUI
}

func saveGUISettings(app *guiApp) {
	if app == nil {
		return
	}
	app.historyExportDir = normalizeHistoryExportDir(app.historyExportDir)
	guiCfg := config.GUIConfig{
		TopMost:                       app.topMost,
		FontSize:                      app.fontSize,
		AutoUnmuteOnSelfLeave:         app.autoUnmuteOnLeave,
		RefreshIntervalValue:          app.refreshIntervalValue,
		RefreshIntervalUnit:           app.refreshIntervalUnit,
		HistoryRegex:                  strings.TrimSpace(app.historyRegex),
		HistoryFromDate:               strings.TrimSpace(app.historyFromDate),
		HistoryToDate:                 strings.TrimSpace(app.historyToDate),
		HistoryExportDir:              strings.TrimSpace(app.historyExportDir),
		HistoryExportIncludeTime:      app.historyExportIncludeTime,
		HistoryExportIncludeWorld:     app.historyExportIncludeWorld,
		HistoryExportIncludeJoinLeave: app.historyExportIncludeJoinLeave,
		HistoryExportCustomEnabled:    app.historyExportCustomEnabled,
		HistoryExportCustom:           strings.TrimSpace(app.historyExportCustom),
	}
	if err := config.SaveGUI("", guiCfg); err != nil {
		guiLog("saveGUISettings failed: " + err.Error())
		return
	}
	guiLog("saveGUISettings ok")
}

func syncHistoryExportSettingsFromControls(app *guiApp, getWindowText, setWindowText *syscall.LazyProc) {
	if app == nil {
		return
	}
	if app.settingsEditSyncing {
		return
	}
	app.historyExportDir = normalizeHistoryExportDir(app.historyExportDir)
	app.historyExportCustom = strings.TrimSpace(app.historyExportCustom)
	if getWindowText != nil {
		app.historyExportDir = normalizeHistoryExportDir(readWindowText(getWindowText, app.settingsExportDirEdit))
		app.historyExportCustom = strings.TrimSpace(readWindowText(getWindowText, app.settingsExportCustomEdit))
	}
	saveGUISettings(app)
	if setWindowText != nil {
		syncHistoryExportEditControls(app, setWindowText)
	}
}

func startHistoryExport(app *guiApp, getWindowText, setWindowText *syscall.LazyProc) bool {
	if app == nil {
		return false
	}
	if app.historyExportRunning {
		app.historyStatus = "exporting..."
		invalidateHistoryPanes(app)
		return true
	}
	req := historyExportRequest{
		Day:              app.historySelectedDate,
		Selected:         cloneHistorySelection(app.historySelectedKeys),
		Rows:             cloneHistoryDetailRows(app.historyDetailRows),
		ExportDir:        app.historyExportDir,
		IncludeTime:      app.historyExportIncludeTime,
		IncludeWorld:     app.historyExportIncludeWorld,
		IncludeJoinLeave: app.historyExportIncludeJoinLeave,
		CustomEnabled:    app.historyExportCustomEnabled,
		Custom:           strings.TrimSpace(app.historyExportCustom),
		RegexText:        strings.TrimSpace(app.historyRegex),
		Query:            historyQueryFromApp(app),
	}
	if req.Day.IsZero() {
		req.Day = time.Now()
	}
	if app.historyExportResultCh == nil {
		app.historyExportResultCh = make(chan historyExportResult, 1)
	}
	guiLog(fmt.Sprintf("history export start day=%s dir=%s selected=%d", req.Day.Format("2006-01-02"), req.ExportDir, len(req.Selected)))
	app.historyExportRunning = true
	app.historyStatus = "exporting..."
	invalidateHistoryPanes(app)
	hwnd := app.hwnd
	go func(ch chan<- historyExportResult, req historyExportRequest, hwnd uintptr) {
		defer func() {
			if r := recover(); r != nil {
				result := historyExportResult{
					Err:           fmt.Errorf("export panic: %v", r),
					Day:           req.Day,
					SelectedCount: len(req.Selected),
				}
				select {
				case ch <- result:
				default:
				}
				if postMessageProc != nil && hwnd != 0 {
					postMessageProc.Call(hwnd, uintptr(wmHistoryExportDone), 0, 0)
				}
			}
		}()
		path, err := exportHistoryDayFromRequest(req)
		result := historyExportResult{
			Path:          path,
			Err:           err,
			Day:           req.Day,
			SelectedCount: len(req.Selected),
		}
		select {
		case ch <- result:
		default:
		}
		if postMessageProc != nil && hwnd != 0 {
			postMessageProc.Call(hwnd, uintptr(wmHistoryExportDone), 0, 0)
		}
	}(app.historyExportResultCh, req, hwnd)
	return true
}

func drainHistoryExportResult(app *guiApp) bool {
	if app == nil || app.historyExportResultCh == nil || !app.historyExportRunning {
		return false
	}
	handled := false
	for {
		select {
		case res := <-app.historyExportResultCh:
			handled = true
			app.historyExportRunning = false
			if res.Err != nil {
				app.historyStatus = "export failed: " + res.Err.Error()
				guiLog(fmt.Sprintf("history export failed day=%s err=%v", res.Day.Format("2006-01-02"), res.Err))
			} else if res.Path != "" {
				app.historyStatus = "exported: " + filepath.Base(res.Path)
				guiLog(fmt.Sprintf("history export ok day=%s path=%s selected=%d", res.Day.Format("2006-01-02"), res.Path, res.SelectedCount))
				if dir := strings.TrimSpace(filepath.Dir(res.Path)); dir != "" {
					if ok := openFolderInExplorer(dir); ok {
						guiLog("history export folder opened: " + dir)
					} else {
						guiLog("history export folder open failed: " + dir)
					}
				}
			} else {
				app.historyStatus = "exported: nothing selected"
				guiLog(fmt.Sprintf("history export skipped day=%s selected=%d", res.Day.Format("2006-01-02"), res.SelectedCount))
			}
			invalidateHistoryPanes(app)
		default:
			return handled
		}
	}
}

func openFolderInExplorer(path string) bool {
	path = strings.TrimSpace(path)
	if path == "" || shellExecuteProc == nil {
		return false
	}
	op, _ := syscall.UTF16PtrFromString("open")
	target, err := syscall.UTF16PtrFromString(path)
	if err != nil {
		return false
	}
	r, _, _ := shellExecuteProc.Call(0, uintptr(unsafe.Pointer(op)), uintptr(unsafe.Pointer(target)), 0, 0, 1)
	return r > 32
}

func syncHistoryExportEditControls(app *guiApp, setWindowText *syscall.LazyProc) {
	if app == nil || setWindowText == nil || app.settingsEditSyncing {
		return
	}
	app.settingsEditSyncing = true
	defer func() {
		app.settingsEditSyncing = false
	}()
	if app.settingsExportDirEdit != 0 {
		text, _ := syscall.UTF16PtrFromString(normalizeHistoryExportDir(app.historyExportDir))
		setWindowText.Call(app.settingsExportDirEdit, uintptr(unsafe.Pointer(text)))
	}
	if app.settingsExportCustomEdit != 0 {
		text, _ := syscall.UTF16PtrFromString(app.historyExportCustom)
		setWindowText.Call(app.settingsExportCustomEdit, uintptr(unsafe.Pointer(text)))
	}
}

func handleHistoryExportBrowseCommand(app *guiApp, setWindowText *syscall.LazyProc) bool {
	if app == nil {
		return false
	}
	path, ok := browseForFolderPath(app.hwnd, "履歴 export フォルダを選択", app.historyExportDir)
	if !ok || strings.TrimSpace(path) == "" {
		return true
	}
	app.historyExportDir = normalizeHistoryExportDir(path)
	saveGUISettings(app)
	if setWindowText != nil {
		syncHistoryExportEditControls(app, setWindowText)
	}
	if invalidateRectProc != nil && app.settingsPaneHwnd != 0 {
		invalidateRectProc.Call(app.settingsPaneHwnd, 0, 1)
	}
	return true
}

func handleHistoryExportSaveCommand(app *guiApp, getWindowText, setWindowText *syscall.LazyProc) bool {
	if app == nil {
		return false
	}
	syncHistoryExportSettingsFromControls(app, getWindowText, nil)
	saveGUISettings(app)
	if invalidateRectProc != nil && app.settingsPaneHwnd != 0 {
		invalidateRectProc.Call(app.settingsPaneHwnd, 0, 1)
	}
	return true
}

func browseForFolderPath(owner uintptr, title, initial string) (string, bool) {
	shell32 := syscall.NewLazyDLL("shell32.dll")
	ole32 := syscall.NewLazyDLL("ole32.dll")
	browseForFolder := shell32.NewProc("SHBrowseForFolderW")
	shGetPathFromIDList := shell32.NewProc("SHGetPathFromIDListW")
	coTaskMemFree := ole32.NewProc("CoTaskMemFree")

	initial = normalizeHistoryExportDir(initial)
	if initial == "" {
		initial = filepath.Join(runtimeDir(), "exports")
	}
	titlePtr, _ := syscall.UTF16PtrFromString(title)
	initialPtr, _ := syscall.UTF16PtrFromString(initial)
	displayName := make([]uint16, 260)
	callback := syscall.NewCallback(func(hwnd uintptr, msg, lParam, lpData uintptr) uintptr {
		if msg == bffmInitialized && lParam != 0 && sendMessageProc != nil {
			sendMessageProc.Call(hwnd, bffmSetSelectionW, 1, lParam)
		}
		return 0
	})
	type browseInfo struct {
		HwndOwner      uintptr
		PidlRoot       uintptr
		PszDisplayName *uint16
		LpszTitle      *uint16
		UlFlags        uint32
		Lpfn           uintptr
		LParam         uintptr
		IImage         int32
	}
	bi := browseInfo{
		HwndOwner:      owner,
		PszDisplayName: &displayName[0],
		LpszTitle:      titlePtr,
		UlFlags:        bifReturnOnlyFsDirs | bifEditBox | bifNewDialogStyle,
		Lpfn:           callback,
		LParam:         uintptr(unsafe.Pointer(initialPtr)),
	}
	pidl, _, _ := browseForFolder.Call(uintptr(unsafe.Pointer(&bi)))
	if pidl == 0 {
		return "", false
	}
	defer func() {
		if coTaskMemFree != nil {
			coTaskMemFree.Call(pidl)
		}
	}()
	pathBuf := make([]uint16, 260)
	ok, _, _ := shGetPathFromIDList.Call(pidl, uintptr(unsafe.Pointer(&pathBuf[0])))
	if ok == 0 {
		return "", false
	}
	return strings.TrimSpace(syscall.UTF16ToString(pathBuf)), true
}

func handleHistoryExportEditCommand(app *guiApp, cmd uint16, notify uint16, getWindowText, setWindowText *syscall.LazyProc) bool {
	if app == nil {
		return false
	}
	if cmd != idHistoryExportDir && cmd != idHistoryExportCustom {
		return false
	}
	if app.settingsEditSyncing {
		return true
	}
	if notify != enKillFocus && notify != enChange {
		return true
	}
	if notify == enChange {
		return true
	}
	syncHistoryExportSettingsFromControls(app, getWindowText, nil)
	return true
}

func normalizeHistoryExportDir(value string) string {
	value = strings.TrimSpace(strings.ReplaceAll(strings.ReplaceAll(value, "\r", ""), "\n", ""))
	if value == "" {
		return filepath.Join(runtimeDir(), "exports")
	}
	value = strings.ReplaceAll(value, "/", `\`)
	if strings.HasPrefix(value, `\\?\`) {
		return filepath.Clean(value)
	}
	if strings.HasPrefix(value, `\\`) {
		rest := strings.TrimLeft(value[2:], `\`)
		for strings.Contains(rest, `\\`) {
			rest = strings.ReplaceAll(rest, `\\`, `\`)
		}
		return filepath.Clean(`\\` + rest)
	}
	for strings.Contains(value, `\\`) {
		value = strings.ReplaceAll(value, `\\`, `\`)
	}
	value = filepath.Clean(value)
	if value == "." {
		return filepath.Join(runtimeDir(), "exports")
	}
	return value
}

func exportDirDisplayText(value string) string {
	return previewLine(normalizeHistoryExportDir(value), 60)
}

func formatRightPane(tab string, state map[string]any, worldLabel string, currentUsers int, current []userState, historyCount int) string {
	var b strings.Builder
	switch tab {
	case "translate":
		b.WriteString("\u7ffb\u8a33")
		b.WriteString("\r\n================")
		b.WriteString("\r\nOCR: ")
		b.WriteString(onOffLine(stateString(state, "ocr")))
		b.WriteString("\r\nOCR text: ")
		b.WriteString(previewLine(stateString(state, "ocr"), 96))
		b.WriteString("\r\nTranslate: ")
		b.WriteString(onOffLine(stateString(state, "translate")))
		b.WriteString("\r\nTranslation: ")
		b.WriteString(previewLine(stateString(state, "translate"), 96))
		return b.String()
	case "settings":
		b.WriteString("\u8a2d\u5b9a")
		b.WriteString("\r\n========")
		b.WriteString("\r\nTop most: ")
		b.WriteString(onOffBool(stateBool(state, "top_most")))
		b.WriteString("\r\nFont size: ")
		fontSize, _ := state["font_size"].(int)
		if fontSize == 0 {
			fontSize = defaultGUIFontSize
		}
		b.WriteString(strconv.Itoa(fontSize))
		b.WriteString("\r\nLeave unmute: ")
		b.WriteString(onOffBool(stateBool(state, "auto_unmute_on_self_leave")))
		return b.String()
	case "history":
		b.WriteString("ワールド訪問履歴")
		b.WriteString("\r\n========")
		b.WriteString("\r\nvisits: ")
		b.WriteString(strconv.Itoa(historyCount))
		return b.String()
	}

	b.WriteString("\u5165\u9000\u5ba4\u30ed\u30b0")
	b.WriteString("\r\n========")
	events := formatJoinLeaveEvents(current)
	if len(events) == 0 {
		b.WriteString("\r\nnone")
		return b.String()
	}
	b.WriteString("\r\n")
	for _, line := range events {
		b.WriteString(line)
		b.WriteString("\r\n")
	}
	return strings.TrimRight(b.String(), "\r\n")
}

func formatSettingsPane(state map[string]any) string {
	var b strings.Builder
	b.WriteString("\u8a2d\u5b9a")
	b.WriteString("\r\n========")
	b.WriteString("\r\nTop most: ")
	b.WriteString(onOffBool(stateBool(state, "top_most")))
	b.WriteString("\r\nFont size: ")
	fontSize, _ := state["font_size"].(int)
	if fontSize == 0 {
		fontSize = defaultGUIFontSize
	}
	b.WriteString(strconv.Itoa(fontSize))
	b.WriteString("\r\nLeave unmute: ")
	b.WriteString(onOffBool(stateBool(state, "auto_unmute_on_self_leave")))
	if updatedAt, _ := state["updated_at"].(string); strings.TrimSpace(updatedAt) != "" {
		b.WriteString("\r\nUpdated: ")
		b.WriteString(updatedAt)
	}
	b.WriteString("\r\nOCR: ")
	b.WriteString(onOffLine(stateString(state, "ocr")))
	return b.String()
}

func formatJoinLeaveEvents(current []userState) []string {
	type eventLine struct {
		at   time.Time
		line string
	}
	events := make([]eventLine, 0, len(current))
	for _, item := range current {
		at := item.LastJoin
		icon := "\u25b2"
		if !item.Present {
			at = item.LastLeave
			icon = "\u25bc"
		}
		if at.IsZero() {
			continue
		}
		events = append(events, eventLine{
			at:   at,
			line: fmt.Sprintf("[%s] %s %s", at.Format("15:04:05"), icon, item.Name),
		})
	}
	sort.SliceStable(events, func(i, j int) bool {
		if events[i].at.Equal(events[j].at) {
			return strings.ToLower(events[i].line) < strings.ToLower(events[j].line)
		}
		return events[i].at.After(events[j].at)
	})
	out := make([]string, 0, len(events))
	for _, ev := range events {
		out = append(out, ev.line)
	}
	return out
}
func onOffLine(value string) string {
	if strings.TrimSpace(value) == "" {
		return "OFF"
	}
	return "ON"
}

func onOffBool(value bool) string {
	if value {
		return "ON"
	}
	return "OFF"
}

func stateString(state map[string]any, key string) string {
	v, _ := state[key].(string)
	return v
}

func previewLine(text string, limit int) string {
	clean := strings.TrimSpace(strings.ReplaceAll(strings.ReplaceAll(text, "\r", " "), "\n", " "))
	if clean == "" {
		return "none"
	}
	if limit > 0 && len(clean) > limit {
		return clean[:limit-3] + "..."
	}
	return clean
}

func readWindowText(getWindowText *syscall.LazyProc, hwnd uintptr) string {
	if getWindowText == nil || hwnd == 0 {
		return ""
	}
	buf := make([]uint16, 1024)
	n, _, _ := getWindowText.Call(hwnd, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)))
	if n == 0 {
		return ""
	}
	size := int(n)
	if size > len(buf) {
		size = len(buf)
	}
	return strings.TrimSpace(syscall.UTF16ToString(buf[:size]))
}

func stateBool(state map[string]any, key string) bool {
	v, _ := state[key].(bool)
	return v
}

func currentWorldLabel() string {
	if world, _, ok := currentWorldVisitInfo(); ok && strings.TrimSpace(world) != "" {
		return world
	}
	p := filepath.Join(runtimeDir(), "runtime.log")
	b, err := readFileTail(p, guiLogTailBytes)
	latest := ""
	if err == nil {
		lines := strings.Split(string(b), "\n")
		for i := 0; i < len(lines); i++ {
			if !strings.Contains(lines[i], "VRC WORLD") {
				continue
			}
			if i+1 < len(lines) {
				latest = strings.TrimSpace(lines[i+1])
			}
		}
	}
	if strings.TrimSpace(latest) != "" {
		return latest
	}
	state := readRuntimeSnapshot()
	if world := strings.TrimSpace(stateString(state, "world")); world != "" {
		return world
	}
	return ""
}

func vrchatProcessRunning() bool {
	vrchatRunningMu.Lock()
	defer vrchatRunningMu.Unlock()
	now := time.Now()
	if !vrchatRunningLastCheck.IsZero() && now.Sub(vrchatRunningLastCheck) < 2*time.Second {
		return vrchatRunningLastValue
	}
	vrchatRunningLastCheck = now
	vrchatRunningLastValue = false
	kernel32 := syscall.NewLazyDLL("kernel32.dll")
	createToolhelp32Snapshot := kernel32.NewProc("CreateToolhelp32Snapshot")
	process32FirstW := kernel32.NewProc("Process32FirstW")
	process32NextW := kernel32.NewProc("Process32NextW")
	closeHandle := kernel32.NewProc("CloseHandle")
	const th32CSSnapProcess = 0x00000002
	type processEntry32 struct {
		dwSize              uint32
		cntUsage            uint32
		th32ProcessID       uint32
		th32DefaultHeapID   uintptr
		th32ModuleID        uint32
		cntThreads          uint32
		th32ParentProcessID uint32
		pcPriClassBase      int32
		dwFlags             uint32
		szExeFile           [260]uint16
	}
	snapshot, _, _ := createToolhelp32Snapshot.Call(th32CSSnapProcess, 0)
	if snapshot == 0 || snapshot == ^uintptr(0) {
		return false
	}
	defer closeHandle.Call(snapshot)
	var entry processEntry32
	entry.dwSize = uint32(unsafe.Sizeof(entry))
	r1, _, _ := process32FirstW.Call(snapshot, uintptr(unsafe.Pointer(&entry)))
	if r1 == 0 {
		return false
	}
	for {
		if strings.EqualFold(syscall.UTF16ToString(entry.szExeFile[:]), "VRChat.exe") {
			vrchatRunningLastValue = true
			return true
		}
		r1, _, _ = process32NextW.Call(snapshot, uintptr(unsafe.Pointer(&entry)))
		if r1 == 0 {
			break
		}
	}
	return vrchatRunningLastValue
}

func currentWorldFromVRChatLog() string {
	label, _ := currentWorldVisitFromVRChatLog()
	return label
}

func updateWorldState(state *worldState, line string) (bool, string) {
	worldID := ""
	instanceID := ""
	worldName := ""
	roomTitle := ""

	if m := enteringRoomPattern.FindStringSubmatch(line); len(m) == 2 {
		roomTitle = strings.TrimSpace(m[1])
		state.pendingWorldName = roomTitle
	}
	if m := worldLocationPattern.FindStringSubmatch(line); len(m) == 3 {
		worldID = strings.TrimSpace(m[1])
		instanceID = strings.TrimSpace(m[2])
	}
	if m := worldIdPattern.FindStringSubmatch(line); len(m) == 2 {
		worldID = strings.TrimSpace(m[1])
	}
	if m := instanceIdPattern.FindStringSubmatch(line); len(m) == 2 {
		instanceID = strings.TrimSpace(m[1])
	}
	if m := worldNamePattern.FindStringSubmatch(line); len(m) == 2 {
		worldName = strings.TrimSpace(m[1])
	}
	if m := enteringRoomPattern.FindStringSubmatch(line); len(m) == 2 && worldID == "" {
		if worldMatch := worldPattern.FindStringSubmatch(m[1]); len(worldMatch) == 2 {
			worldID = worldMatch[1]
		}
	}

	nextLocation := ""
	if worldID != "" {
		nextLocation = worldID
		if instanceID != "" {
			nextLocation = worldID + ":" + instanceID
		}
	}
	if nextLocation == "" && roomTitle != "" {
		nextLocation = roomTitle
	}

	if nextLocation != "" && nextLocation != state.location {
		state.location = nextLocation
		state.worldID = worldID
		state.instanceID = instanceID
		if worldName != "" {
			state.worldName = worldName
		} else if roomTitle != "" {
			state.worldName = roomTitle
		}
		label := state.worldName
		if label == "" {
			label = state.worldID
		}
		if label == "" {
			label = nextLocation
		}
		state.initialized = true
		return true, label
	}

	if worldName != "" {
		state.worldName = worldName
		state.pendingWorldName = ""
		return false, ""
	}
	if roomTitle != "" {
		state.worldName = roomTitle
	}

	return false, ""
}

func readRuntimeSnapshot() map[string]any {
	p := filepath.Join(runtimeDir(), "state.json")
	b, err := os.ReadFile(p)
	if err != nil {
		return map[string]any{}
	}
	var out map[string]any
	if err := json.Unmarshal(b, &out); err != nil || out == nil {
		return map[string]any{}
	}
	return out
}

func readFileTail(path string, maxBytes int64) ([]byte, error) {
	if maxBytes <= 0 {
		return os.ReadFile(path)
	}
	info, err := os.Stat(path)
	if err != nil {
		return nil, err
	}
	if info.Size() <= maxBytes {
		return os.ReadFile(path)
	}
	f, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer f.Close()
	if _, err := f.Seek(info.Size()-maxBytes, 0); err != nil {
		return nil, err
	}
	b, err := io.ReadAll(f)
	if err != nil {
		return nil, err
	}
	for i, c := range b {
		if c == '\n' && i+1 < len(b) {
			return b[i+1:], nil
		}
	}
	return b, nil
}

func currentWorldStartTime() time.Time {
	p := filepath.Join(runtimeDir(), "runtime.log")
	b, err := readFileTail(p, guiLogTailBytes)
	if err != nil {
		return time.Time{}
	}
	var latest time.Time
	for _, raw := range strings.Split(string(b), "\n") {
		line := strings.TrimSpace(raw)
		if line == "" {
			continue
		}
		if !(strings.Contains(line, "VRC WORLD") ||
			strings.Contains(line, "Joining or Creating Room") ||
			strings.Contains(line, "world loaded") ||
			strings.Contains(line, "Successfully joined room")) {
			continue
		}
		if at, ok := parseRuntimeTime(line); ok && at.After(latest) {
			latest = at
		}
	}
	return latest
}

func parseJoinLeaveLine(line string) (time.Time, string, string) {
	m := joinLeaveLinePattern.FindStringSubmatch(line)
	if len(m) != 4 {
		return time.Time{}, "", ""
	}
	at, err := time.Parse("2006-01-02 15:04:05", m[1])
	if err != nil {
		return time.Time{}, "", ""
	}
	return at, m[2], strings.TrimSpace(m[3])
}

func parseJoinLeaveCount(line string) int {
	m := regexp.MustCompile(`\((\d+)\)$`).FindStringSubmatch(line)
	if len(m) != 2 {
		return 0
	}
	n, err := strconv.Atoi(m[1])
	if err != nil {
		return 0
	}
	return n
}

func parseRuntimeTime(line string) (time.Time, bool) {
	m := runtimeTimePattern.FindStringSubmatch(line)
	if len(m) != 2 {
		return time.Time{}, false
	}
	at, err := time.Parse("2006-01-02 15:04:05", m[1])
	if err != nil {
		return time.Time{}, false
	}
	return at, true
}

func countPresent(items []userState) int {
	n := 0
	for _, item := range items {
		if item.Present {
			n++
		}
	}
	return n
}

func timeAgo(at time.Time) string {
	if at.IsZero() {
		return ""
	}
	d := time.Since(at)
	if d < time.Minute {
		return "1\u5206\u524d"
	}
	if d < time.Hour {
		return fmt.Sprintf("%d\u5206\u524d", int(d.Minutes()))
	}
	if d < 24*time.Hour {
		return fmt.Sprintf("%d\u6642\u9593\u524d", int(d.Hours()))
	}
	return fmt.Sprintf("%d\u65e5\u524d", int(d.Hours()/24))
}