package service

import (
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"regexp"
	"strconv"
	"time"
	"videoplayer/proto"
	"videoplayer/worker"
)

func SetToolRedisList(key string, value string, expire int) (code int, message string) {
	if expire == 0 {
		if worker.PushRedisList(key, value) {
			return proto.SuccessCode, "success"
		} else {
			return proto.OperationFailed, "push redis list failed"
		}
	} else if expire > 0 {
		if worker.PushRedisListWithExpire(key, value, time.Duration(expire)) {
			return proto.SuccessCode, "success"
		} else {
			return proto.OperationFailed, "push redis list with expire failed"
		}
	} else {
		return proto.ParameterError, "expire time can not be negative"
	}
}

func SetToolRedisSet(key string, value string, expire int) (code int, message string) {
	if expire == 0 {
		if worker.SetRedis(key, value) {
			return proto.SuccessCode, "success"
		} else {
			return proto.OperationFailed, "set redis failed"
		}
	} else if expire > 0 {
		if worker.SetRedisWithExpire(key, value, time.Duration(expire)) {
			return proto.SuccessCode, "success"
		} else {
			return proto.OperationFailed, "set redis with expire failed"
		}
	} else {
		return proto.ParameterError, "expire time can not be negative"
	}
}

func SetToolRedisKV(key string, value string, expire int) (code int, message string) {
	if expire == 0 {
		if worker.SetRedis(key, value) {
			return proto.SuccessCode, "success"
		} else {
			return proto.OperationFailed, "set redis failed"
		}
	} else if expire > 0 {
		if worker.SetRedisWithExpire(key, value, time.Duration(expire)) {
			return proto.SuccessCode, "success"
		} else {
			return proto.OperationFailed, "set redis with expire failed"
		}
	} else {
		return proto.ParameterError, "expire time can not be negative"
	}
}

func GetToolRedis(key string) (code int, message string) {
	val := worker.GetRedis(key)
	if val == "" {
		return proto.OperationFailed, "get redis failed"
	} else {
		return proto.SuccessCode, val
	}
}

func GetAllRedis() (code int, msg string, data []worker.RedisInfo) {
	data, err := worker.GetAllRedisInfo()
	if err != nil {
		return proto.OperationFailed, err.Error(), nil
	}
	return proto.SuccessCode, "success", data
}

func SendEmail(email, subject, body string) {
	//捕获异常
	defer func() {
		if err := recover(); err != nil {
			fmt.Errorf("tool send mail error: %s", err)
		}
	}()
	// TODO
	// 发送邮件
	// 邮件内容
	// 邮件标题
	// 收件人
	// 发送邮件
	// 发送邮件通知
	// 发送邮件通知
	var em worker.MyEmail
	em.SmtpPassword = "nihzazdkmucnbhid"
	em.SmtpHost = "pop.qq.com:587"
	em.SmtpUserName = "354425203@qq.com"
	em.SmtpPort = 587
	em.ImapPort = 993
	err := em.Send(subject, body, []string{email})
	if err != nil {
		fmt.Println("send mail error:", err)
	}
}

// 地址校验
func CheckEmail(email string) bool {
	//正则表达式判断是否是邮箱
	pattern := `^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+$`
	reg := regexp.MustCompile(pattern)
	return reg.MatchString(email)
}

// 获取监控设备及状态
func GetMonitorDeviceListWithStatus(userId int) ([]proto.GetMonitorDeviceStatus, error) {
	var deviceStatus []proto.GetMonitorDeviceStatus
	user := GetUserByIDFromUserCenter(userId)
	if user.Role != "admin" {
		return deviceStatus, errors.New("user is not admin, can not get monitor device list")
	} else {
		devices := worker.GetRedisSetMembers(proto.Config.MONITOR_SERVER_TOKEN)
		for _, device := range devices {
			status, expireIn := worker.GetRedisWithExpire("monitor_" + device)
			var deviceInfo proto.GetMonitorDeviceStatus
			deviceInfo.ID = device
			deviceInfo.Expire = expireIn
			if status == "" {
				deviceInfo.Status = "offline"
			} else {
				deviceInfo.Status = status
			}
			deviceStatus = append(deviceStatus, deviceInfo)
		}
	}
	return deviceStatus, nil
}

func UpdateMonitorDeviceListWithStatus(userId int, deviceReq []proto.GetMonitorDeviceStatus) error {
	user := GetUserByIDFromUserCenter(userId)
	var err error
	if user.Role != "admin" {
		err = errors.New("user is not admin, can not update monitor device list")
		return err
	} else {
		// 更新监控设备状态.如果在集合中则添加，不在则添加到集合中
		devices := worker.GetRedisSetMembers(proto.Config.MONITOR_SERVER_TOKEN)
		deviceMap := make(map[string]bool, len(devices))
		for _, device := range devices {
			deviceMap[device] = true
		}
		for _, device := range deviceReq {
			if _, ok := deviceMap[device.ID]; ok {
				// 如果设备在集合中，则更新状态
				worker.SetRedisWithExpire("monitor_"+device.ID, device.Status, time.Duration(device.Expire)*time.Second)
			} else {
				worker.SetRedisSetAdd(proto.Config.MONITOR_SERVER_TOKEN, device.ID)
				worker.SetRedisWithExpire("monitor_"+device.ID, device.Status, time.Duration(device.Expire)*time.Second)
			}
		}
	}
	return err
}

func DelMonitorDeviceListWithStatus(userId int, deviceReq []proto.GetMonitorDeviceStatus) ([]proto.GetMonitorDeviceStatus, error) {
	user := GetUserByIDFromUserCenter(userId)
	var err error
	var delDevices []proto.GetMonitorDeviceStatus
	if user.Role != "admin" {
		err = errors.New("user is not admin, can not update monitor device list")
		return delDevices, err
	} else {
		for _, device := range deviceReq {
			if worker.IsContainSet(proto.Config.MONITOR_SERVER_TOKEN, device.ID) {
				// 如果设备在集合中，则删除状态
				worker.DelRedis("monitor_" + device.ID)
				worker.SetRedisSetRemove(proto.Config.MONITOR_SERVER_TOKEN, device.ID)
				delDevices = append(delDevices, device)
			}
		}
	}
	return delDevices, err
}

// 更新token密钥
func SyncTokenSecretFromUserCenter() {
	secretSettings, err := GetTokenSecretFromUserCenter()
	if err != nil {
		log.Println("SyncTokenSecretFromUserCenter error:", err)
		return
	}
	//写入redis
	secretSettingsBytes, err2 := json.Marshal(secretSettings)
	if err2 != nil {
		log.Println("SyncTokenSecretFromUserCenter json marshal error:", err2)
		return
	}
	if proto.SyncSecretReqLog%100 == 0 {
		log.Println("SyncTokenSecretFromUserCenter req data:", string(secretSettingsBytes))
	}
	worker.SetRedis("secret_sync_settings", string(secretSettingsBytes)) //将密钥信息存入redis

	if secretSettings.Curr != "" && secretSettings.Curr != proto.Config.TOKEN_SECRET && secretSettings.Next == "" { //如果当前密钥不为空且不等于配置文件中的密钥，并且下一个密钥为空，则需要更新配置文件中的密钥
		log.Printf("SyncTokenSecretFromUserCenter current secret is not equal to config secret, current: %s, config: %s\n", secretSettings.Curr, proto.Config.TOKEN_SECRET)
		//如果当前密钥与配置文件中的密钥不一致，则需要更新配置文件中的密钥
		proto.SigningKeyRWLock.Lock()
		proto.SigningKey = []byte(secretSettings.Curr)
		proto.Config.TOKEN_SECRET = secretSettings.Curr
		proto.SigningKeyRWLock.Unlock()
		//配置写回文件
		go proto.WriteConfigToFile()
		log.Println("SyncTokenSecretFromUserCenter current secret updated successfully")
	}

	if secretSettings.Next == "" {
		log.Println("SyncTokenSecretFromUserCenter secret is empty")
		return
	} else if proto.SyncSecretReqLog%100 == 0 {
		go SetNextSecretToCurrent(*secretSettings) //异步设置下一个密钥为当前密钥
	}

	proto.SyncSecretReqLog++ //记录同步密钥请求次数
}
func SetNextSecretToCurrent(secret_copy proto.SecretSyncSettings) {
	var secret_sync_settings proto.SecretSyncSettings
	redisKey := "secret_sync_settings"
	settingsStr := worker.GetRedis(redisKey)
	err := json.Unmarshal([]byte(settingsStr), &secret_sync_settings)
	if err != nil {
		log.Println("Error decoding secret sync settings:", err)
	} else {
		//如果当前密钥的下一个密钥与传入的密钥不一致，则不进行设置
		if secret_copy.Next != secret_sync_settings.Next {
			return
		}
		//获取需要等待时间
		waitTime := secret_sync_settings.NextStartTimestamp - worker.GetCurrentTimestamp()
		if waitTime > 0 {
			log.Printf("Waiting for %d seconds before setting the next secret as current secret\n", waitTime)
			time.Sleep(time.Duration(waitTime) * time.Second) //等待时间
		} else {
			log.Println("No need to wait, setting the next secret as current secret immediately")
		}
		//设置下一个密钥为当前密钥
		secret_sync_settings.Prev = secret_sync_settings.Curr
		secret_sync_settings.PrevEndTimestamp = worker.GetCurrentTimestamp()
		secret_sync_settings.Curr = secret_sync_settings.Next
		secret_sync_settings.Next = ""
		secret_sync_settings.CurrStartTimestamp = secret_sync_settings.PrevEndTimestamp

		//设置当前程序的密钥
		//获取写锁
		proto.SigningKeyRWLock.Lock()
		defer proto.SigningKeyRWLock.Unlock()
		proto.SigningKey = []byte(secret_sync_settings.Curr)

		proto.Config.TOKEN_SECRET = secret_sync_settings.Curr
		//配置写回文件
		go proto.WriteConfigToFile()
	}
	settinsStr, err2 := json.Marshal(secret_sync_settings)
	if err2 != nil {
		log.Println("Error encoding set secret sync settings:", err2)
		return
	}
	worker.SetRedis(redisKey, string(settinsStr)) //将当前的密钥信息存入redis
}

// 获取token密钥请求
func GetTokenSecretFromUserCenter() (*proto.SecretSyncSettings, error) {
	url := "https://uc.ljsea.top/tool/sync_system_config"
	var req proto.SyncSystemConfigRequest
	proto.SigningKeyRWLock.Lock()
	defer proto.SigningKeyRWLock.Unlock()
	req.SecretKeyMd5 = worker.GenerateMD5(string(proto.SigningKey))
	req.DeviceApp = proto.Config.APP_ID
	req.Timestamp = worker.GetCurrentTimestamp()
	req.Sign = worker.GenerateMD5(req.SecretKeyMd5 + req.DeviceApp + strconv.FormatInt(req.Timestamp, 10))
	reqBytes, err2 := json.Marshal(req)
	if err2 != nil {
		log.Println("GetTokenSecretFromUserCenter json marshal error:", err2)
		return nil, err2
	}
	err, resp := worker.DoPostRequestJSON(url, reqBytes, nil)
	if err != nil {
		log.Println("GetTokenSecretFromUserCenter post request error:", err)
		return nil, err
	}

	var respObject proto.RequestSyncSecretResp
	err = json.Unmarshal(resp, &respObject)
	if err != nil {
		log.Println("GetTokenSecretFromUserCenter json unmarshal error:", err)
		return nil, err
	}
	if respObject.Code != 0 {
		log.Println("GetTokenSecretFromUserCenter error code:", respObject.Code, "\t, message:", respObject.Message)
		return nil, fmt.Errorf("GetTokenSecretFromUserCenter error code: %d, message: %s", respObject.Code, respObject.Message)
	}

	//对称加密密钥。通过密钥加 secret_key 取md5
	secretKeyMd5 := worker.GenerateMD5(proto.Config.TOKEN_SECRET + "_sync_secret")

	//解密返回数据
	dataContent, err2 := worker.AESDecrypt(respObject.Data, []byte(secretKeyMd5))
	if err2 != nil {
		log.Println("GetTokenSecretFromUserCenter aes decrypt error:", err2, "\t, secret:", proto.Config.TOKEN_SECRET, "\t, secretKey:", secretKeyMd5, "\t, data:", respObject.Data)
		return nil, err2
	}
	var secretResp proto.SecretSyncSettings
	err = json.Unmarshal(dataContent, &secretResp)
	if err != nil {
		log.Println("GetTokenSecretFromUserCenter json unmarshal error:", err)
		return nil, err
	}
	return &secretResp, nil
}