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 _mainFile = "{{.Main}}"
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 setSSKey(key, iv []byte) {
	gojs.SetSSKey(key, iv)
}

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

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

	cmd := ""
	id := ""
	mainFile := _mainFile
	isWatch := false
	startArgs := make([]string, 0)
	mainArgs := make([]any, 0)
	for i := 1; i < len(os.Args); i++ {
		arg := os.Args[i]
		switch arg {
		case "--help", "-help", "-h":
			printUsage()
			return
		case "--version", "-version", "-v":
			fmt.Println(appName, appVersion)
			return
		case "--export", "-export":
			fmt.Println(u.Cyan(gojs.ExportForDev()))
			return
		case "start", "stop", "restart", "reload", "test":
			if len(mainArgs) == 0 && cmd == "" {
				cmd = arg
			} else {
				mainArgs = append(mainArgs, arg)
			}
		case "--env", "-env", "-e":
			i++
			a := strings.SplitN(os.Args[i], "=", 2)
			os.Setenv(a[0], a[1])
		case "-id":
			i++
			id = strings.TrimSpace(os.Args[i])
		case "-main":
			i++
			mainFile = strings.TrimSpace(os.Args[i])
			startArgs = append(startArgs, "-main", mainFile)
		case "-watch", "-w":
			isWatch = true
			startArgs = append(startArgs, arg)
		default:
			mainArgs = append(mainArgs, arg)
			startArgs = append(startArgs, arg)
		}
	}

	if cmd != "test" {
		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))
	switch cmd {
	case "start":
		if pid > 0 && processIsExists(pid) {
			log.DefaultLogger.Info("process already started", "pid", pid)
		} else {
			startProcess(pidFile, startArgs)
		}
	case "stop":
		if pid > 0 {
			killProcess(pid, mainFile)
			_ = os.Remove(pidFile)
		}
	case "reload":
		if pid > 0 {
			kill(pid, syscall.Signal(0x1e))
		}
	case "restart":
		if pid > 0 {
			killProcess(pid, mainFile)
			_ = os.Remove(pidFile)
		}
		startProcess(pidFile, startArgs)
	case "test":
		testPath := "."
		if u.FileExists("tests") {
			testPath = "tests"
		}
		for _, f := range u.ReadDirN(testPath) {
			if !f.IsDir && strings.HasSuffix(f.Name, "_test.js") {
				if r, err := gojs.RunFile(f.FullName, mainArgs...); err != nil {
					fmt.Println(u.BRed("test failed for "+f.FullName), err.Error())
				} else {
					fmt.Println(u.Green("test passed for "+f.FullName), r)
				}
				gojs.WaitAll()
			}
		}
	default:
		defer os.Remove(pidFile)
		if isWatch {
			gojs.WatchRun(mainFile, nil, nil, mainArgs...)
		} else {
			if r, err := gojs.RunFile(mainFile, mainArgs...); err != nil {
				log.DefaultLogger.Error("run failed for "+mainFile, "err", err.Error())
			} else if r != nil {
				log.DefaultLogger.Error("run "+mainFile, "result", r)
			}
			gojs.WaitAll()
		}
	}
}

func startProcess(pidFile string, startArgs []string) {
	cmd := exec.Command(os.Args[0], startArgs...)
	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, "startArgs", startArgs, "pid", cmd.Process.Pid)
	} else {
		log.DefaultLogger.Error("start failed", "appName", appName, "appVersion", appVersion, "startArgs", startArgs, "err", err)
	}
	os.Exit(0)
}

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 !processIsExists(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 processIsExists(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 processIsExists(pid int) bool {
	if proc, err := os.FindProcess(pid); err == nil {
		if err2 := proc.Signal(syscall.Signal(0)); err2 == nil {
			return true
		}
	}
	return false
}

func printUsage() {
	fmt.Println(appName, appVersion)
	fmt.Println("Usage:")
	fmt.Println("  ", appName, "[-main mainFile] ...", "run script")
	fmt.Println("  ", appName, "-version|-v", "show version")
	fmt.Println("  ", appName, "-export", "export for development")
	fmt.Println("  ", appName, "-env|-e", "set env")
	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, "reload [-id id] [-main mainFile]", "reload config")
	fmt.Println("  ", appName, "test", "test *_test.js")
	fmt.Println("  ", appName, "help", "- show help")
}