package app

import (
	"fmt"
	"log"
	"strings"
	"syscall"
	"unsafe"
)

const (
	vkControl = 0x11
	vkShift   = 0x10
	vkM       = 0x4D
	keyUp     = 0x0002
	swRestore = 9
)

func pressDiscordMuteHotkey() error {
	user32 := syscall.NewLazyDLL("user32.dll")
	enumWindows := user32.NewProc("EnumWindows")
	getWindowTextW := user32.NewProc("GetWindowTextW")
	isWindowVisible := user32.NewProc("IsWindowVisible")
	setForegroundWindow := user32.NewProc("SetForegroundWindow")
	showWindow := user32.NewProc("ShowWindow")
	getWindowRect := user32.NewProc("GetWindowRect")
	keybdEvent := user32.NewProc("keybd_event")
	setCursorPos := user32.NewProc("SetCursorPos")
	sleep := syscall.NewLazyDLL("kernel32.dll").NewProc("Sleep")

	var target uintptr
	cb := syscall.NewCallback(func(hwnd uintptr, lparam uintptr) uintptr {
		vis, _, _ := isWindowVisible.Call(hwnd)
		if vis == 0 {
			return 1
		}
		buf := make([]uint16, 512)
		n, _, _ := getWindowTextW.Call(hwnd, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)))
		if n == 0 {
			return 1
		}
		title := strings.ToLower(strings.TrimSpace(syscall.UTF16ToString(buf[:n])))
		if !strings.Contains(title, "discord") {
			return 1
		}
		target = hwnd
		return 0
	})
	r1, _, err1 := enumWindows.Call(cb, 0)
	if r1 == 0 && target == 0 {
		return fmt.Errorf("discord window not found: %v", err1)
	}
	if target == 0 {
		return fmt.Errorf("discord window not found")
	}

	showWindow.Call(target, swRestore)
	setForegroundWindow.Call(target)
	sleep.Call(150)

	type rect struct {
		Left   int32
		Top    int32
		Right  int32
		Bottom int32
	}
	var r rect
	if v, _, _ := getWindowRect.Call(target, uintptr(unsafe.Pointer(&r))); v != 0 {
		x := int((r.Left + r.Right) / 2)
		y := int((r.Top + r.Bottom) / 2)
		setCursorPos.Call(uintptr(x), uintptr(y))
		sleep.Call(50)
	}

	send := func(vk byte, flags uintptr) {
		keybdEvent.Call(uintptr(vk), 0, flags, 0)
	}
	send(vkControl, 0)
	send(vkShift, 0)
	send(vkM, 0)
	send(vkM, keyUp)
	send(vkShift, keyUp)
	send(vkControl, keyUp)
	sleep.Call(100)

	SetDiscordWindow("Discord")
	log.Printf("discord hotkey sent via keybd_event")
	return nil
}