package handler

import (
	"crypto/md5"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt"
	"github.com/google/uuid"
	"time"
	"videoplayer/dao"
	"videoplayer/proto"
	"videoplayer/service"
	"videoplayer/worker"
)

var signingKey = []byte(proto.TOKEN_SECRET)

func SetUpUserGroup(router *gin.Engine) {
	userGroup := router.Group("/user")
	userGroup.POST("/register", registerHandler)
	userGroup.POST("/login", loginHandler)
	userGroup.POST("/uuid", GetScanUUID)
	userGroup.POST("/gqr", GetQRStatus)
	userGroup.POST("/sqr", SetQRStatus)
	userGroup.POST("/confirm", ConfirmQRLogin)
	userGroup.POST("/search", SearchHandler)
	userGroup.POST("/info", GetUserInfo)
}

type RLReq struct {
	User     string `json:"username" form:"username"`
	Email    string `json:"email" form:"email"`
	Password string `json:"password" form:"password"`
	Age      int    `json:"age" form:"age"`
	Gender   string `json:"gender" form:"gender"`
}

type QRReq struct {
	UUID    string `json:"uuid" form:"uuid"`
	Address string `json:"address" form:"address"`
	IP      string `json:"ip" form:"ip"`
}

type SearchReq struct {
	Keyword string `json:"keyword" form:"keyword"`
	ID      int    `json:"id" form:"id"`
}

func GetUserInfo(c *gin.Context) {
	id, _ := c.Get("id")
	user_id := int(id.(float64))
	user := dao.FindUserByID2(user_id)
	user.Password = "" //不返回密码
	c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": user})
}

func GetScanUUID(c *gin.Context) {
	var ReqData QRReq
	if err := c.ShouldBind(&ReqData); err != nil {
		c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err, "data": "2"})
		return
	}
	data := map[string]interface{}{"status": "0", "address": ReqData.Address, "ip": c.ClientIP()}
	jsonData, err := json.Marshal(data)
	if err != nil {
		c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err, "data": "2"})
		return
	}
	id := uuid.New()
	res := worker.SetRedisWithExpire(id.String(), string(jsonData), time.Minute*30)
	if res {
		var retrievedData map[string]interface{}
		if err2 := json.Unmarshal([]byte(worker.GetRedis(id.String())), &retrievedData); err2 != nil {
			c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err2, "data": "2"})
			return
		}
		c.JSON(200, gin.H{"code": proto.SuccessCode, "message": retrievedData, "data": id.String()})
	} else {
		c.JSON(200, gin.H{"code": proto.RedisSetError, "message": "qr code invalid", "data": "1"})
	}
}

func SetQRStatus(c *gin.Context) {
	var qrsetReq QRReq
	if err := c.ShouldBind(&qrsetReq); err == nil && qrsetReq.UUID != "" {
		if worker.IsContainKey(qrsetReq.UUID) == false {
			c.JSON(200, gin.H{"code": proto.UUIDNotFound, "message": "uuid not found in server", "data": "0"})
			return
		}
		var retrievedData map[string]interface{}
		if err2 := json.Unmarshal([]byte(worker.GetRedis(qrsetReq.UUID)), &retrievedData); err2 != nil {
			c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err2, "data": "2"})
			return
		}
		retrievedData["status"] = "1"
		jsonData, err2 := json.Marshal(retrievedData)
		if err2 != nil {
			c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err2, "data": "2"})
			return
		}
		res := worker.SetRedisWithExpire(qrsetReq.UUID, string(jsonData), time.Minute*30)
		if res {
			c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": retrievedData})
		} else {
			c.JSON(200, gin.H{"code": proto.RedisSetError, "message": "qr code invalid", "data": "1"})
		}
	} else {
		c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err, "data": "2"})
	}
}

// 确认返回token数据
func ConfirmQRLogin(c *gin.Context) {
	var qrsetReq QRReq
	if err := c.ShouldBind(&qrsetReq); err == nil && qrsetReq.UUID != "" {
		//user_id, _ := c.Get("id")
		user_name, _ := c.Get("username")
		if user_name != "" {
			key := "user_" + user_name.(string)
			token := worker.GetRedis(key)
			if token == "" {
				c.JSON(200, gin.H{"code": proto.RedisGetError, "message": "Token不存在", "data": "20"})
			}
			if worker.IsContainKey(qrsetReq.UUID) == false {
				c.JSON(200, gin.H{"code": proto.UUIDNotFound, "message": "uuid not found in server", "data": "0"})
				return
			}
			var retrievedData map[string]interface{}
			if err2 := json.Unmarshal([]byte(worker.GetRedis(qrsetReq.UUID)), &retrievedData); err2 != nil {
				c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err2, "data": "2"})
				return
			}
			retrievedData["status"] = token
			jsonData, err2 := json.Marshal(retrievedData)
			if err2 != nil {
				c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err2, "data": "2"})
				return
			}
			if worker.SetRedisWithExpire(qrsetReq.UUID, string(jsonData), time.Minute*10) {
				c.JSON(200, gin.H{"code": 0, "message": "success", "data": "0"})
			} else {
				c.JSON(200, gin.H{"code": proto.RedisSetError, "message": "设置Token失败", "data": "8"})
			}
		} else {
			c.JSON(200, gin.H{"code": proto.RedisGetError, "message": "failed", "data": "20"})
		}
	} else {
		c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err, "data": "3"})
	}
}

func GetQRStatus(c *gin.Context) {
	var qrReq QRReq
	if err := c.ShouldBind(&qrReq); err == nil {
		var retrievedData map[string]interface{}
		if err2 := json.Unmarshal([]byte(worker.GetRedis(qrReq.UUID)), &retrievedData); err2 != nil {
			c.JSON(200, gin.H{"code": proto.DeviceRestartFailed, "message": err2, "data": "2"})
			return
		}
		str := retrievedData["status"].(string)
		switch str {
		case "":
			c.JSON(200, gin.H{"code": proto.UUIDNotFound, "message": "uuid not found", "data": "0"}) //空值
		case "0":
			c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": "0"}) //空值
		case "1":
			c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": "1"}) //已扫描待确认
		default:
			// 解析 JWT 令牌
			token, err := jwt.Parse(str, func(token *jwt.Token) (interface{}, error) {
				return signingKey, nil
			})
			if err != nil {
				c.JSON(200, gin.H{"error": err.Error(), "code": proto.TokenParseError, "message": "error"})
				return
			}
			// 返回令牌
			data := make(map[string]interface{})
			data["id"] = token.Claims.(jwt.MapClaims)["id"]
			data["username"] = token.Claims.(jwt.MapClaims)["username"]
			data["email"] = token.Claims.(jwt.MapClaims)["email"]
			data["token"] = str
			c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": data}) //确认返回token数据
		}
	} else {
		c.JSON(200, gin.H{"error": err.Error(), "code": proto.DeviceRestartFailed, "message": "error"})
	}
}

func SearchHandler(c *gin.Context) {
	var req_data SearchReq
	if err := c.ShouldBind(&req_data); err == nil {
		if req_data.ID != -1 {
			user := service.GetUserByID(req_data.ID)
			group := service.GetGroupByID(req_data.ID)
			c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": user, "group": group})
			return
		} else if req_data.Keyword != "" {
			users := service.GetUserByNameLike(req_data.Keyword)
			groups := service.GetGroupByNameLike(req_data.Keyword)
			c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": users, "group": groups})
			return
		} else {
			c.JSON(200, gin.H{"code": proto.ParameterError, "message": "error", "data": "无ID 与 关键字"})
		}
	} else {
		c.JSON(200, gin.H{"error": err.Error(), "code": proto.ParameterError, "message": "error"})
	}
}

func loginHandler(c *gin.Context) {
	var req_data RLReq
	tokenString := ""
	if err := c.ShouldBind(&req_data); err == nil {
		if len(req_data.Password) != 32 {
			hasher := md5.New()
			hasher.Write([]byte(req_data.Password))                 // 生成密码的 MD5 散列值
			req_data.Password = hex.EncodeToString(hasher.Sum(nil)) // 生成密码的 MD5 散列值
		}
		user := service.GetUser(req_data.User, req_data.Password, req_data.Password)
		if user.ID != 0 {
			key := "user_" + user.Name
			redis_token := worker.GetRedis(string(key))
			if redis_token == "" {
				// 生成 JWT 令牌
				token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
					"username": user.Name,
					"id":       user.ID,
					"exp":      time.Now().Add(time.Hour * 10).Unix(), // 令牌过期时间, 10小时后过期
				})
				tokenString, err = token.SignedString(signingKey)
				if err != nil {
					c.JSON(200, gin.H{"error": err.Error(), "code": proto.TokenGenerationError, "message": "error"})
					return
				}

				worker.SetRedisWithExpire("user_"+user.Name, tokenString, time.Hour*10) // 将用户信息存入
				worker.SetRedisWithExpire(tokenString, tokenString, time.Hour*10)       // 设置过期时间为10分钟
				data := make(map[string]interface{})
				data["id"] = user.ID
				data["username"] = user.Name
				data["email"] = user.Email
				worker.SetHash(tokenString, data) // 将用户信息存入
			} else {
				tokenString = redis_token
			}
			// 返回令牌
			data := make(map[string]interface{})
			data["id"] = user.ID
			data["username"] = user.Name
			data["email"] = user.Email
			data["token"] = tokenString
			c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": data})
		} else {
			//用户名或密码错误
			c.JSON(200, gin.H{"error": "用户名或密码错误", "code": proto.UsernameOrPasswordError, "message": "error"})
		}
	} else {
		c.JSON(200, gin.H{"error": err.Error(), "code": proto.DeviceRestartFailed, "message": "error"})
	}
}

func registerHandler(c *gin.Context) {
	var req_data RLReq
	tokenString := ""
	var id uint
	if err := c.ShouldBind(&req_data); err == nil {
		if len(req_data.Password) != 32 {
			hasher := md5.New()
			hasher.Write([]byte(req_data.Password))                 // 生成密码的 MD5 散列值
			req_data.Password = hex.EncodeToString(hasher.Sum(nil)) // 生成密码的 MD5 散列值
		}
		if service.ContainsUser(req_data.User, req_data.Email) == true {
			c.JSON(200, gin.H{"error": "user already exists", "code": proto.UsernameExists, "message": "error"})
			return
		}
		id = service.CreateUser(req_data.User, req_data.Password, req_data.Email, req_data.Gender, req_data.Age)
		if id == 0 {
			c.JSON(200, gin.H{"error": "create user error", "code": proto.OperationFailed, "message": "error"})
			return
		}
		// 生成 JWT 令牌
		token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
			"username": req_data.User,
			"id":       id,
			"exp":      time.Now().Add(time.Hour * 10).Unix(), // 令牌过期时间, 1分钟后过期
		})
		tokenString, err = token.SignedString(signingKey)
		if err != nil {
			c.JSON(200, gin.H{"error": err.Error(), "code": proto.TokenGenerationError, "message": "error"})
			return
		}
	} else {
		c.JSON(200, gin.H{"error": err.Error(), "code": proto.ParameterError, "message": "error"})
		return
	}
	fmt.Println(req_data)
	res := worker.SetRedisWithExpire(tokenString, tokenString, time.Hour*10) // 设置过期时间为10分钟
	if !res {
		c.JSON(200, gin.H{"error": "set token error", "code": proto.RedisSetError, "message": "error"})
		return
	}
	// 返回令牌
	data := make(map[string]interface{})
	data["id"] = id
	data["username"] = req_data.User
	data["email"] = req_data.Email
	data["token"] = tokenString
	c.JSON(200, gin.H{"code": proto.SuccessCode, "message": "success", "data": data})
	return
}