package main

import (
	"fmt"
	"log"
	"net"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"strconv"
	"syscall"
)

func main() {
	//config := src.GetAppConfig()
	//fmt.Println(config)
	//src.Apply(config.Domains[0])
	//fmt.Println(os.Getwd())
	//err := os.MkdirAll("cert\\abc", 0777)
	//if err != nil {
	//	fmt.Println(err)
	//}
	fmt.Println("start()")
	start()
}

const pidFile = "acme-mana.pid"
const socketFile = "acme-mana.sock"

var stdout *os.File
var stderr *os.File

func start() {
	initLog()
	log.Println("Run Acme Mana...")
	args := os.Args
	if len(args) <= 1 {
		daemonStart()
		return
	}
	command := args[1]
	switch command {
	case "start":
		daemonStart()
	case "stop":
		daemonStop()
	case "status":
		daemonStatus()
	case "-s":
		daemonCommand()
	default:
		log.Fatalf("Unknown command: %s", command)
	}
}

func initLog() {
	pwd, err := os.Getwd()
	if err != nil {
		log.Fatalf("Failed to get current working directory: %v", err)
	}
	dir := path.Join(pwd, "log")
	_, err = os.Stat(dir)
	if os.IsNotExist(err) {
		err := os.Mkdir(dir, 0777)
		if err != nil {
			log.Fatalf("Failed to create directory: %v", err)
		}
	}
	outFile, err := os.OpenFile(path.Join(dir, "out.log"), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
	defer outFile.Close()
	stdout = outFile

	errFile, err := os.OpenFile(path.Join(dir, "err.log"), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
	defer stderr.Close()
	stderr = errFile
}

func daemonStart() {
	isDaemon := os.Getenv("GO_DAEMON")
	log.Println("Run Daemon, DAEMON Is " + isDaemon)
	if isDaemon != "1" {
		// 直接启动
		if isRunning() {
			log.Println("Daemon is already running.")
			return
		}

		path, err := os.Executable()
		if err != nil {
			log.Fatalf("Failed to get executable path: %v", err)
		}
		cmd := exec.Cmd{
			Path: path,
			Args: os.Args,
			Dir:  filepath.Dir(path),
			Env:  append(os.Environ(), "GO_DAEMON=1"),
			//Stdin:       os.Stdin,
			Stdout: stdout,
			Stderr: stderr,
			//Stdin:       os.Stdin,
			//Stdout:      os.Stdout,
			//Stderr:      os.Stderr,
			SysProcAttr: &syscall.SysProcAttr{},
		}

		//cmd := exec.Command(os.Args[0])
		//cmd.Env = append(os.Environ(), "GO_DAEMON=1")
		//cmd.Stdout = os.Stdout
		//cmd.Stderr = os.Stderr
		//cmd.SysProcAttr = &syscall.SysProcAttr{}
		log.Println("Starting daemon...")
		log.Println(cmd)
		err = cmd.Start()
		if err != nil {
			log.Fatalf("Failed to start daemon: %v", err)
		}
		err = os.WriteFile(pidFile, []byte(strconv.Itoa(cmd.Process.Pid)), 0644)
		if err != nil {
			log.Fatalf("Failed to write PID file: %v", err)
		}
		log.Printf("Daemon started with PID: %d", cmd.Process.Pid)
		os.Exit(0)

	} else {
		// 子进程
		doTask()
	}

}

func daemonStop() {
	//pid, err := readPID()
	//if err != nil {
	//	log.Fatalf("Failed to stop daemon: %v", err)
	//}
	//
	//process, err := os.FindProcess(pid)
	//if err != nil {
	//	log.Fatalf("Failed to find process: %v", err)
	//}
	//
	//err = process.Signal(syscall.SIGTERM)
	//if err != nil {
	//	log.Fatalf("Failed to stop process: %v", err)
	//}
	//
	//os.Remove(pidFile)
	//os.Remove(socketFile)
	//log.Println("Daemon stopped.")
	sendCommand("stop")
}

func daemonStatus() {
	if isRunning() {
		log.Println("Daemon is running.")
	} else {
		log.Println("Daemon is not running.")
	}
}

func daemonCommand() {
	log.Println("Sending command...")
	//pid, err := readPID()
	//if err != nil {
	//	log.Fatalf("Failed to send command: %v", err)
	//}
	//
	//_, err = os.FindProcess(pid)
	//if err != nil {
	//	log.Fatalf("Failed to find process: %v", err)
	//}
	//if len(os.Args) < 3 {
	//	log.Fatalf("No command specified")
	//}
	command := os.Args[2]
	sendCommand(command)

}

func sendCommand(command string) {
	conn, err := net.Dial("unix", socketFile)
	if err != nil {
		log.Fatalf("Failed to connect to daemon: %v", err)
	}
	defer func(conn net.Conn) {
		err := conn.Close()
		if err != nil {
			log.Fatalf("Failed to close connection: %v", err)
		}
	}(conn)

	_, err = conn.Write([]byte(command))
	if err != nil {
		log.Fatalf("Failed to send command: %v", err)
	}

	log.Printf("Sending command '%s' to daemon with PID: %d", command, 0)
}

func doTask() {
	// 示例：每隔10秒打印一条日志
	//for {
	//	log.Println("Daemon is running...")
	//	time.Sleep(10 * time.Second)
	//}
	initSocket()
}

func isRunning() bool {
	log.Println("Checking if daemon is running...")
	pid, err := readPID()
	if err != nil {
		return false
	}

	process, err := os.FindProcess(pid)
	log.Println("Found process:", process)
	if err != nil {
		log.Println("Failed to find process:", err)
		return false
	}
	return true
	//err = process.Signal(syscall.Signal(0))
	//log.Println("Signal result:", err)
	//return err == nil
}

func readPID() (int, error) {
	log.Println("Reading PID file...")
	data, err := os.ReadFile(pidFile)
	if err != nil {
		log.Println("Failed to read PID file:", err)
		return 0, err
	}
	log.Println("PID file content:", string(data))

	pid, err := strconv.Atoi(string(data))
	if err != nil {
		log.Println("Failed to parse PID:", err)
		return 0, err
	}
	log.Println("PID:", pid)

	return pid, nil
}

func initSocket() {
	// 删除旧的 socket 文件
	if _, err := os.Stat(socketFile); err == nil {
		os.Remove(socketFile)
	}

	listener, err := net.Listen("unix", socketFile)
	if err != nil {
		log.Fatalf("Failed to listen on socket: %v", err)
	}
	defer listener.Close()

	for {
		log.Println("Waiting for connections...")
		conn, err := listener.Accept()
		if err != nil {
			log.Printf("Failed to accept connection: %v", err)
			continue
		}

		go handleConnection(conn)
	}
}

func handleConnection(conn net.Conn) {
	defer conn.Close()

	buf := make([]byte, 1024)
	n, err := conn.Read(buf)
	if err != nil {
		log.Printf("Failed to read command: %v", err)
		return
	}

	command := string(buf[:n])
	log.Printf("Received command: %s", command)

	// 在这里处理接收到的命令
	switch command {
	case "stop":
		onStop()
	default:
		onCommand(command)
	}
}

func onStop() {
	log.Println("Stopping daemon...")
	os.Remove(pidFile)
	log.Println("Remove PID File...")
	os.Remove(socketFile)
	log.Println("Remove Socket File...")
	os.Exit(0)
}
func onCommand(command string) {

}