package user

import (
	"encoding/json"
	"fmt"
	"github.com/golang-jwt/jwt/v4"
	"github.com/google/uuid"
	"nCovTrack-Backend/global"
	"nCovTrack-Backend/models"
	"nCovTrack-Backend/utils"
	"strings"
	"time"
)

const (
	EMAIL_CODE_REDIS_KEY = "verify_code_"
)

// Login if login success, will return token
func Login(user map[string]interface{}) (token string) {
	account := user["account"].(string)
	var queryMap []map[string]interface{}
	if strings.Contains(account, "@") {
		queryMap = append(queryMap, map[string]interface{}{"email": account})
	} else {
		queryMap = append(queryMap, map[string]interface{}{"phone": account})
	}
	userInfo := models.Get[models.BackUser](queryMap)
	if userInfo == nil {
		return ""
	}
	if !utils.PasswordCompare(user["password"].(string), userInfo["password"].(string)) {
		return ""
	}
	claims := jwt.MapClaims{
		"id":       userInfo["id"],
		"username": userInfo["username"],
		"role":     userInfo["role"],
		"email":    userInfo["email"],
	}
	return utils.GenerateToken(claims)
}

// Register user register, user can use account after approved
func Register(user map[string]interface{}) {
	user["password"] = utils.PasswordEncrypt(user["password"].(string))
	userStr, _ := json.Marshal(user)
	// insert into redis, wait for approve
	cmd := global.Redis.HMSet(global.REGISTER_REDIS_KEY, map[string]interface{}{user["email"].(string): userStr})
	if cmd.Err() != nil {
		panic(cmd.Err())
	}
}

// ListRegister list the registers in the redis to be approved
func ListRegister() *[]map[string]interface{} {
	applyStrMap := global.Redis.HGetAll(global.REGISTER_REDIS_KEY).Val()
	var applies []map[string]interface{}
	for _, v := range applyStrMap {
		var apply map[string]interface{}
		_ = json.Unmarshal([]byte(v), &apply)
		applies = append(applies, apply)
	}
	if applies == nil {
		applies = []map[string]interface{}{}
	}
	return &applies
}

// ApproveRegister approve a register
func ApproveRegister(email string, pass bool) bool {
	if !pass {
		rowsAffected := global.Redis.HDel(global.REGISTER_REDIS_KEY, email).Val()
		return rowsAffected != 0
	}
	// if pass, will get the register info from redis, and the insert into mysql, this mean user is register success
	applyStr := global.Redis.HGet(global.REGISTER_REDIS_KEY, email).Val()
	rowsAffected := global.Redis.HDel(global.REGISTER_REDIS_KEY, email).Val()
	if rowsAffected == 0 {
		return false
	}
	var apply map[string]interface{}
	_ = json.Unmarshal([]byte(applyStr), &apply)
	if !NoDuplicatePhoneOrEmail(apply["phone"].(string), apply["email"].(string)) {
		return false
	}
	colMap := models.MapJ2c[models.BackUser](apply, true)
	ok, rowsAffected := models.Upsert[models.BackUser](colMap)
	return ok && rowsAffected != 0
}

// ChangePassword user change password, or user forgot password
func ChangePassword(changePwd map[string]interface{}) bool {
	match := VerifyEmailCode(changePwd["email"].(string), changePwd["code"].(string))["match"].(bool)
	if !match {
		return false
	}
	newPassword := utils.PasswordEncrypt(changePwd["newPassword"].(string))
	colMap := map[string]interface{}{
		"id":       1,
		"password": newPassword,
	}
	models.BeforeSave(colMap, -1)
	delete(colMap, "id")
	rowAffected := global.Db.Model(models.BackUser{}).Where("email = ?", changePwd["email"]).Updates(colMap).RowsAffected
	if rowAffected == 0 {
		return false
	}
	now := time.Now().Unix()
	global.Redis.HSet(global.CHANGEPWD_REDIS_KEY, changePwd["email"].(string), now)
	return true
}

// NoDuplicatePhoneOrEmail detect the phone or email is registered or not
func NoDuplicatePhoneOrEmail(phone string, email string) bool {
	var queryMap []map[string]interface{}
	if phone != "" {
		queryMap = append(queryMap, map[string]interface{}{"phone": phone})
	}
	if email != "" {
		queryMap = append(queryMap, map[string]interface{}{"email": email})
	}
	return len(queryMap) != 0 && models.Count[models.BackUser](queryMap) == 0
}

// SendEmailCode used to send email verify code
func SendEmailCode(email string) bool {
	code := uuid.New().String()[0:6]
	text := fmt.Sprintf("Your Verify Code is :%s, Will Expire After 10 Minutes", code)
	subject := "nCovTrack Verify"
	// only set expired, not limit the frequency of use
	global.Redis.Set(EMAIL_CODE_REDIS_KEY+email, code, 10*time.Minute)
	return utils.SendEmail(subject, text, email)
}

// VerifyEmailCode use to verify user's verify code is correct or not
func VerifyEmailCode(email string, code string) map[string]interface{} {
	verifyCode := global.Redis.Get(EMAIL_CODE_REDIS_KEY + email).Val()
	return map[string]interface{}{"match": verifyCode == code}
}