package service

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"github.com/sirupsen/logrus"
	"strconv"
	"strings"
	"time"
	"youngee_m_api/consts"
	"youngee_m_api/db"
	"youngee_m_api/model/redis_model"
	"youngee_m_api/model/system_model"
	"youngee_m_api/redis"
	"youngee_m_api/util"
)

var LoginAuth *loginAuth

func LoginAuthInit(config *system_model.Session) {
	auth := new(loginAuth)
	auth.sessionTTL = time.Duration(config.TTL) * time.Minute
	LoginAuth = auth
}

type loginAuth struct {
	sessionTTL time.Duration
}

func (l *loginAuth) AuthToken(ctx context.Context, token string) (*redis_model.Auth, error) {
	user, err := l.parseToken(ctx, token)
	if err != nil {
		logrus.Debug("token格式错误:%+v", token)
		return nil, err
	}
	auth, err := l.getSessionAuth(ctx, user)
	if err != nil {
		logrus.Debug("获取session redis错误: token:%+v,err:%+v", token, err)
		return nil, err
	}
	if auth.Token != token {
		logrus.Debug("获取session time过期错误: token:%+v", token)
		return nil, errors.New("auth failed")
	}
	return auth, nil
}

func (l *loginAuth) AuthCode(ctx context.Context, User string, password string) (string, error) {
	user, err := db.GetUser(ctx, User)
	if err != nil {
		return "", err
	} else if user == nil {
		// 账号不存在
		logrus.Debugf("[AuthCode] auth fail,User:%+v", User)
		return "账号不存在", errors.New("auth fail")
	} else if string(user.Role) != consts.BRole && string(user.Role) != consts.BRole2{
		// 账号权限有误
		logrus.Debugf("[AuthCode] auth fail,User:%+v", User)
		return "权限错误，请登录管理账号", errors.New("auth fail")
	}
	var token string
	if user.Password == password{
		token = l.getToken(ctx, user.User)
		auth := &redis_model.Auth{
			Phone:        user.Phone,
			ID:           user.ID,
			User:         user.User,
			Username:     user.Username,
			RealName:     user.RealName,
			Role:         user.Role,
			Email:        user.Email,
			Token:        token,
		}
		if err := l.setSession(ctx, user.User, auth); err != nil {
			fmt.Printf("setSession error\n")
			return "", err
		}
	}
	return token, nil
}

func (l *loginAuth) setSession(ctx context.Context, user string, auth *redis_model.Auth) error {
	if authJson, err := json.Marshal(auth); err == nil {
		err = redis.Set(ctx, l.getRedisKey(user), string(authJson), l.sessionTTL)
		if err == nil {
			return err
		}
	}
	return nil
}

//func (l *loginAuth) getSessionCode(ctx context.Context, phone string) (*string, error) {
//	value, err := redis.Get(ctx, l.getRedisKey(phone))
//	if err != nil {
//		if err == consts.RedisNil {
//			return nil, fmt.Errorf("not found in redis,phone:%+v", phone)
//		}
//		return nil, err
//	}
//	return &value, nil
//}

func (l *loginAuth) getSessionAuth(ctx context.Context, user string) (*redis_model.Auth, error) {
	value, err := redis.Get(ctx, l.getRedisKey(user))
	if err != nil {
		if err == consts.RedisNil {
			return nil, fmt.Errorf("not found in redis,user:%+v", user)
		}
		return nil, err
	}
	auth := new(redis_model.Auth)
	if err = json.Unmarshal([]byte(value), auth); err != nil {
		return nil, err
	}
	return auth, nil
}

func (l *loginAuth) getToken(ctx context.Context, user string) string {
	timeSeed := strconv.FormatInt(time.Now().Unix(), 10)
	token := user + "." + timeSeed + "." + util.MD5(user, timeSeed, consts.AuthSalt)
	return token
}

func (l *loginAuth) parseToken(ctx context.Context, token string) (string, error) {
	parts := strings.Split(token, ".")
	if len(parts) == 3 {
		user := parts[0]
		timeSeed := parts[1]
		if parts[2] == util.MD5(user, timeSeed, consts.AuthSalt) {
			return user, nil
		}
	}
	return "", errors.New("token invalid")
}
func (l *loginAuth) encryptPassword(password string) string {
	return util.MD5(password)
}
func (l *loginAuth) getRedisKey(key string) string {
	return fmt.Sprintf("%s%s", consts.SessionRedisPrefix, key)
}