package main

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strings"
	"syscall"
	"time"

	"apigo.cc/gojs"
	{{range $pkg, $ver := .Module}}
	_ "{{$pkg}}"
	{{- end}}
	{{range $pkg, $ver := .ExtraImport}}
	_ "{{$pkg}}"
	{{- end}}
	"github.com/ssgo/log"
	"github.com/ssgo/u"
)

var appName = "{{.Name}}"
var appVersion = "{{.Version}}"
var idFixMatcher = regexp.MustCompile(`[^a-zA-Z0-9_]`)

// TODO embed .CacheFiles

func init() {
	{{- range $alias, $pkg := .ModuleAlias }}
	gojs.Alias("{{$alias}}", "{{$pkg}}")
	{{- end}}
}

func main() {
	if appName == "" {
		appName = filepath.Base(os.Args[0])
		appName = strings.TrimSuffix(appName, ".exe")
	}

	if appVersion == "" {
		appVersion = "0.0.1"
	}

	args := os.Args[1:]
	if len(args) > 0 {
		if args[0] == "help" || args[0] == "--help" || args[0] == "-h" {
			printUsage()
			return
		}

		if args[0] == "version" || args[0] == "--version" || args[0] == "-v" {
			fmt.Println(appName, appVersion)
			return
		}

		if args[0] == "export" || args[0] == "-e" {
			gojs.ExportForDev()
			return
		}
	}

	cmd := ""
	if len(args) > 0 && (args[0] == "start" || args[0] == "stop" || args[0] == "restart" || args[0] == "test") {
		cmd = args[0]
		args = args[1:]
	}

	id := ""
	mainFile := "{{.Main}}"
	isWatch := false
	mainArgs := make([]any, 0)
	for i := 0; i < len(args); i++ {
		arg := args[i]
		if strings.HasPrefix(arg, "-") {
			switch arg[1:] {
			case "id":
				i++
				strings.TrimSpace(args[i])
			case "main":
				i++
				strings.TrimSpace(args[i])
			case "w":
				isWatch = true
			}
		} else {
			mainArgs = append(mainArgs, arg)
		}
	}

	if !u.FileExists(mainFile) {
		log.DefaultLogger.Error("main file not found", "mainFile", mainFile)
		return
	}

	if id == "" {
		id = fmt.Sprintf("%s_%s_%s", appName, mainFile, appVersion)
	}

	id = idFixMatcher.ReplaceAllString(id, "_")
	homeDir, _ := os.UserHomeDir()
	pidFile := filepath.Join(homeDir, ".pids", id+".pid")
	pid := u.Int(u.ReadFileN(pidFile))
	fmt.Println(appName, appVersion, mainFile, id, pidFile, pid)
	switch cmd {
	case "start":
		if pid > 0 && checkProcess(pid) {
			log.DefaultLogger.Info("process already started", "pid", pid)
		} else {
			startProcess(pidFile, mainFile)
		}
	case "stop":
		if pid > 0 {
			killProcess(pid, mainFile)
			_ = os.Remove(pidFile)
		}
	case "restart":
		if pid > 0 {
			killProcess(pid, mainFile)
			_ = os.Remove(pidFile)
		}
		startProcess(pidFile, mainFile)
	case "test":
		if pid > 0 {
			killProcess(pid, mainFile)
			_ = os.Remove(pidFile)
		}
		startProcess(pidFile, mainFile)
	default:
		if isWatch {
			gojs.WatchRun(mainFile, mainArgs...)
		} else {
			gojs.RunFile(mainFile, mainArgs...)
			gojs.WaitAll()
		}
	}
}

func startProcess(pidFile string, mainFile string) {
	var cmd *exec.Cmd
	cmd = exec.Command(os.Args[0], "-main", mainFile)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Start(); err == nil {
		u.WriteFile(pidFile, u.String(cmd.Process.Pid))
		log.DefaultLogger.Info("started", "appName", appName, "appVersion", appVersion, "mainFile", mainFile, "pid", cmd.Process.Pid)
	} else {
		log.DefaultLogger.Error("start failed", "appName", appName, "appVersion", appVersion, "mainFile", mainFile, "err", err)
	}
}

func kill(pid int, sig os.Signal) error {
	if proc, err := os.FindProcess(pid); err == nil {
		return proc.Signal(sig)
	} else {
		return err
	}
}

func killProcess(pid int, mainFile string) {
	if err := kill(pid, syscall.SIGTERM); err == nil {
		log.DefaultLogger.Info("killing", "appName", appName, "appVersion", appVersion, "mainFile", mainFile, "pid", pid)
		t1 := time.Now().UnixMilli()
		for i := 0; i < 100; i++ {
			if !checkProcess(pid) {
				log.DefaultLogger.Info("killed", "appName", appName, "appVersion", appVersion, "mainFile", mainFile, "pid", pid, "usedTime", (time.Duration(time.Now().UnixMilli()-t1) * time.Millisecond).String())
				return
			}
			time.Sleep(100 * time.Millisecond)
		}
		err := kill(pid, syscall.SIGKILL)
		if checkProcess(pid) {
			log.DefaultLogger.Error("fource kill failed", "appName", appName, "appVersion", appVersion, "mainFile", mainFile, "pid", pid, "err", err)
		} else {
			log.DefaultLogger.Info("fource killed", "appName", appName, "appVersion", appVersion, "mainFile", mainFile, "pid", pid)
		}
	}
}

func checkProcess(pid int) bool {
	// return kill(pid, 0) == nil
	_, err := os.FindProcess(pid)
	return err == nil
}

func printUsage() {
	fmt.Println(appName, appVersion)
	fmt.Println("Usage:")
	fmt.Println("  ", appName, "[-main mainFile] ...", "run script")
	fmt.Println("  ", appName, "version", "- show version")
	fmt.Println("  ", appName, "export", "- export for development")
	fmt.Println("  ", appName, "start [-id id] [-main mainFile]", "start server")
	fmt.Println("  ", appName, "stop [-id id]", "stop server")
	fmt.Println("  ", appName, "restart [-id id] [-main mainFile]", "restart server")
	fmt.Println("  ", appName, "help", "- show help")
}