package user

import (
	"context"
	"encoding/json"
	"io"
	"log"
	"net/http"

	"github.com/go-redis/redis/v8"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

type Userreg struct {
	Username   string `json:"username"`
	Password   string `json:"password"`
	Email      string `json:"email"`
	Verifycode string `json:"verifycode"`
}

func Userregister(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Access-Control-Allow-Origin", "http://localhost:8080")
	w.Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
	w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
	w.Header().Set("Access-Control-Allow-Credentials", "true")

	if r.Method == "OPTIONS" {
		w.WriteHeader(http.StatusOK)
		return
	}

	body, error := io.ReadAll(r.Body)
	if error != nil {
		log.Println("数据读取失败")
		return
	}
	var userinfo Userreg
	error = json.Unmarshal(body, &userinfo)
	if error != nil {
		log.Println("数据读取失败")
		return
	}

	var username = userinfo.Username
	var password = userinfo.Password
	var useremail = userinfo.Email
	var verifycode = userinfo.Verifycode

	mongodbcli := options.Client().ApplyURI("mongodb://localhost:27017").SetMaxPoolSize(100)

	mongodbclient, error := mongo.Connect(context.TODO(), mongodbcli)
	if error != nil {
		log.Println("数据库连接失败")
		return
	}
	findtheoneuser := bson.M{"username": username}

	finduser := mongodbclient.Database("users").Collection("userlist")
	_, error = finduser.Find(context.Background(), findtheoneuser)
	if error == nil {
		log.Println("该用户名已存在")
		loginres := Loginresponse{
			Success: "no",
			Message: "注册失败，用户已经存在",
			Token:   "2",
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(loginres)
		return

	}

	findtheoneemail := bson.M{"email": useremail}
	_, error = finduser.Find(context.Background(), findtheoneemail)
	if error == nil {
		log.Println("该邮箱已存在")
		loginres := Loginresponse{
			Success: "no",
			Message: "注册失败",
			Token:   "3",
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(loginres)
		return
	}

	redisdb := redis.NewClient(&redis.Options{
		Addr:     "localhost:6379",
		Password: "",
		DB:       0,
	})

	findveri, error := redisdb.HGet(context.Background(), "userverify", useremail).Result()
	if error != nil {
		log.Println("验证码验证失败")
		loginres := Loginresponse{
			Success: "no",
			Message: "注册失败，验证码错误",
			Token:   "4",
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(loginres)
		return
	}

	if findveri != verifycode {
		log.Println("验证码验证失败")
		loginres := Loginresponse{
			Success: "no",
			Message: "注册失败，验证码错误",
			Token:   "4",
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(loginres)
		return
	}

	_, error = finduser.InsertOne(context.Background(), bson.M{"username": username, "password": password, "email": useremail})
	if error != nil {
		log.Println("数据插入失败")
		loginres := Loginresponse{
			Success: "no",
			Message: "用户数据错误",
			Token:   "5",
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(loginres)
		return
	}

}