package main

import (
	"flag"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"syscall"
	"unsafe"

	"vrc_osc_go/internal/app"
	"vrc_osc_go/internal/buildinfo"
	"vrc_osc_go/internal/common"
	"vrc_osc_go/internal/update"
)

func main() {
	_ = appendLauncherLog("LAUNCHER", "launcher main begin")
	var baseURL string
	var ownerRepo string
	var assetName string
	flag.StringVar(&baseURL, "base-url", "https://git.vrcworldtour.com", "Gitea base URL")
	flag.StringVar(&ownerRepo, "repo", "every_holiday/VRCWT-OSC", "owner/repo")
	flag.StringVar(&assetName, "asset", "vrc_osc-windows.zip", "release asset name")
	flag.Parse()

	client := &update.Client{BaseURL: baseURL}
	mgr := &update.Manager{
		Client:       client,
		OwnerRepo:    ownerRepo,
		AssetName:    assetName,
		CurrentLabel: buildinfo.Version,
	}
	if _, err := mgr.CheckAndUpdate(); err != nil {
		log.Printf("auto update skipped: %v", err)
		_ = appendLauncherLog("LAUNCHER", "auto update skipped: "+err.Error())
	} else {
		_ = appendLauncherLog("LAUNCHER", "auto update ok")
	}
	base := runtimeBaseDir()
	exe := filepath.Join(base, "vrc_osc.exe")
	gui := filepath.Join(base, "vrc_osc_gui.exe")
	_ = appendLauncherLog("LAUNCHER", "runtimeBaseDir="+base)
	if _, err := os.Stat(exe); err != nil {
		_ = appendLauncherLog("LAUNCHER", "missing runtime exe: "+err.Error())
		showError("vrc_osc_launcher", "missing exe: "+err.Error())
		log.Fatalf("missing exe: %v", err)
	}
	_ = appendLauncherLog("LAUNCHER", "version="+buildinfo.Version+" build="+buildinfo.BuildTime+" base="+base+" exe="+exe+" gui="+gui)
	if _, err := os.Stat(gui); err == nil {
		_ = appendLauncherLog("LAUNCHER", "starting gui companion")
		_ = exec.Command(gui).Start()
	} else {
		_ = appendLauncherLog("LAUNCHER", "gui companion missing: "+err.Error())
	}
	args := append([]string{"--no-gui"}, os.Args[1:]...)
	_ = appendLauncherLog("LAUNCHER", "launching runtime args="+strings.Join(args, " "))
	if err := update.Launch(exe, args); err != nil {
		_ = appendLauncherLog("LAUNCHER", "launch failed: "+err.Error())
		showError("vrc_osc_launcher", "launch failed: "+err.Error())
		log.Fatalf("launch failed: %v", err)
	}
	_ = appendLauncherLog("LAUNCHER", "runtime launch returned")
}

func showError(title, message string) {
	user32 := syscall.NewLazyDLL("user32.dll")
	msgBox := user32.NewProc("MessageBoxW")
	const mbOK = 0x00000000
	const mbIconError = 0x00000010
	_, _, _ = msgBox.Call(
		0,
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(message))),
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(title))),
		uintptr(mbOK|mbIconError),
	)
}

func runtimeBaseDir() string {
	root := common.RootDir()
	if _, err := os.Stat(filepath.Join(root, "vrc_osc.exe")); err == nil {
		return root
	}
	if _, err := os.Stat(filepath.Join(root, "tmp", "vrc_osc.exe")); err == nil {
		return filepath.Join(root, "tmp")
	}
	return root
}

func appendLauncherLog(title, text string) error {
	return app.AppendRuntimeLog(title, text)
}