package main

import (
	"encoding/json"
	"os"
	"os/exec"
	"sentinel/pkg/config"
	"sentinel/pkg/log"
	model2 "sentinel/pkg/model"
	"sentinel/pkg/utils"
	"strconv"
	"time"
)

type BusinessService struct {
	mqtt          *MQTTService
	deviceID      string
	deptId        string
	cmdTopic      string
	deviceType    string
	subscriptions map[string]struct{} // 记录已订阅 topic
}

func NewBusinessService(m *MQTTService, deviceID string) *BusinessService {
	return &BusinessService{
		mqtt:          m,
		deviceID:      deviceID,
		subscriptions: make(map[string]struct{}),
	}
}

// SubscribeTopic 订阅指定 topic，并记录可取消
func (b *BusinessService) SubscribeTopic(topic string, qos byte) error {
	if err := b.mqtt.Subscribe(topic, qos); err != nil {
		return err
	}
	b.subscriptions[topic] = struct{}{}
	return nil
}

func getInitTopic(deviceID string) string {
	return "+/+/+/" + deviceID + "/#"
}
func (b *BusinessService) getOwnTopic(deviceID string) string {
	return b.deptId + "/cmd/" + b.deviceType + "/" + deviceID + "/#"
}

func (b *BusinessService) Start() error {
	if err := b.SubscribeTopic(getInitTopic(b.deviceID), 1); err != nil {
		return err
	}

	b.mqtt.SetMessageHandler(b.onMQTTMessage)

	// 第一次连接就发送状态信息
	b.SendStatusInfo()

	return nil
}

// UnsubscribeTopic 取消订阅指定 topic
func (b *BusinessService) UnsubscribeTopic(topic string) error {
	token := b.mqtt.client.Unsubscribe(topic)
	if token.Wait() && token.Error() != nil {
		return token.Error()
	}
	delete(b.subscriptions, topic)
	return nil
}

// UnsubscribeAll 取消所有已订阅 topic
func (b *BusinessService) UnsubscribeAll() {
	for topic := range b.subscriptions {
		_ = b.mqtt.client.Unsubscribe(topic)
		delete(b.subscriptions, topic)
	}
}

// 消息处理
func (b *BusinessService) onMQTTMessage(topic string, payload []byte) {
	model := model2.FromStringToMqttTopic(topic)
	// 指令
	if model.Domain == "cmd" && model.DeviceType == b.deviceType {
		log.Println("收到指令：", model.Resource)
		switch model.Resource {
		case "ping":
			log.Println("pong")
		case "shutdown":
			b.handleShutdown()
		case "restart":
			b.handleRestart()
		case "check_update":
			b.handleCheckUpdate()
		default:
			log.Println("未知的命令：", model.Resource)
		}
	} else if model.Domain == "status" && model.Resource == "receipt" {
		b.deviceType = model.DeviceType
		b.deptId = model.DeptId
		// 取消订阅之前的初始化主题
		if b.UnsubscribeTopic(getInitTopic(b.deviceID)) != nil {
			log.Error("无法取消初始化主题")
			return
		}
		// 新订阅属于自己的主题
		if b.SubscribeTopic(b.getOwnTopic(b.deviceID), 1) != nil {
			log.Error("无法定于属于自己的主题")
			return
		}
		log.Println("设备初始化成功：所属项目：", model.DeptId, "\t设备类型：", model.DeviceType)
	}
}

func (b *BusinessService) SendStatusInfo() {
	info := map[string]interface{}{
		"version":      config.APP_VERSION,
		"online":       true,
		"ip":           utils.GetLocalIP(),
		"hostname":     utils.GetHostname(),
		"mac":          utils.GetMacAddress(),
		"os":           utils.GetOSInfo(),
		"cpu":          utils.GetCPUInfo(),
		"memory_total": utils.GetMemory(),
		"disk_total":   utils.GetDisk(),
		"last_seen":    time.Now().UTC().Format(time.RFC3339),
	}

	payload, _ := json.Marshal(info)
	topic := "x/status/x/" + b.deviceID + "/info"
	qos := byte(1)
	retained := true
	log.Println("发送消息：", topic)

	if err := b.mqtt.Publish(topic, qos, retained, payload); err != nil {
		log.Println("发送状态信息出错：", err)
	} else {
		log.Println("发送状态信息：", string(payload))
	}
}

// 关闭程序（立即退出）
func (b *BusinessService) handleShutdown() {
	os.Exit(0)
}

// 重启程序
func (b *BusinessService) handleRestart() {
	exe, _ := os.Executable()
	cmd := exec.Command(exe)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	_ = cmd.Start()
	os.Exit(0)
}
func (b *BusinessService) handleCheckUpdate() {

	args := []string{
		"--version", strconv.Itoa(config.APP_VERSION),
	}

	launcher := newUpdaterLauncher()

	if err := launcher.Start(args); err != nil {
		log.Println("[BUS] failed to start updater:", err)
		return
	}

	log.Println(
		"[BUS] updater started, exiting main program",
	)

	time.Sleep(500 * time.Millisecond)
	os.Exit(0)
}

// handleCheckUpdate 触发更新流程（主程序侧）
//func (b *BusinessService) handleCheckUpdate() {
//
//	args := []string{
//		"--version", strconv.Itoa(config.APP_VERSION),
//	}
//
//	cmd := exec.Command("./updater.exe", args...)
//	cmd.Stdout = os.Stdout
//	cmd.Stderr = os.Stderr
//
//	// OS 级脱离父进程
//	switch runtime.GOOS {
//	case "windows":
//		cmd.SysProcAttr = &syscall.SysProcAttr{
//			CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
//		}
//	}
//
//	if err := cmd.Start(); err != nil {
//		log.Println("[BUS] failed to start updater:", err)
//		return
//	}
//
//	log.Println(
//		"[BUS] updater started (pid=%d), exiting main program\n",
//		cmd.Process.Pid,
//	)
//
//	// 给 updater 留出启动窗口（尤其是 systemd / docker 环境）
//	time.Sleep(500 * time.Millisecond)
//
//	os.Exit(0)
//}