package models

import (
	"crypto/md5"
	"fmt"
	"log"
	"main/configs"
	"main/utils"
	"time"
)

type User struct {
	ID        int    `json:"id"`
	Name      string `json:"name"`
	Email     string `json:"email"`
	CreatedAt string `json:"created_at"`
	UpdatedAt string `json:"updated_at"`
	Password  string `json:"-"`
	Slat      string `json:"-"`
}

func (user *User) Create(name, email, password string) error {

	if name == "" || email == "" || password == "" {
		return fmt.Errorf("name, email and password can not be empty")
	}

	user.Slat = utils.RandomString(16)
	user.Password = fmt.Sprintf("%x", md5.Sum([]byte(password+user.Slat)))
	user.Name = name
	user.Email = email
	user.CreatedAt = time.Now().Format("2006-01-02 15:04:05")
	user.UpdatedAt = user.CreatedAt

	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return err
	}
	defer db.Close()
	stmt, err := db.Prepare("INSERT INTO users(name, email, password, slat, created_at, updated_at) values(?, ?, ?, ?, ?, ?)")
	if err != nil {
		log.Println(err)
		return err
	}
	defer stmt.Close()
	result, err := stmt.Exec(user.Name, user.Email, user.Password, user.Slat, user.CreatedAt, user.UpdatedAt)
	if err != nil {
		log.Println(err)
		return err
	}
	id, err := result.LastInsertId()
	if err != nil {
		return err
	}
	user.ID = int(id)
	return nil
}

func (user *User) Delete() error {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return err
	}
	defer db.Close()
	stmt, err := db.Prepare("DELETE FROM users WHERE id = ?")
	if err != nil {
		log.Println(err)
		return err
	}
	defer stmt.Close()
	_, err = stmt.Exec(user.ID)
	if err != nil {
		log.Println(err)
		return err
	}
	return nil
}

func (user *User) Update() error {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return err
	}
	defer db.Close()
	stmt, err := db.Prepare("UPDATE users SET name = ?, email = ?, updated_at = ? WHERE id = ?")
	if err != nil {
		log.Println(err)
		return err
	}
	defer stmt.Close()
	_, err = stmt.Exec(user.Name, user.Email, user.UpdatedAt, user.ID)
	if err != nil {
		log.Println(err)
		return err
	}
	return nil
}

func (user *User) RoadByID(id int) (err error) {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return err
	}
	defer db.Close()
	err = db.QueryRow("SELECT id, name, email, password, slat, created_at, updated_at FROM users WHERE id = ?", user.ID).Scan(&user.ID, &user.Name, &user.Email, &user.Password, &user.Slat, &user.CreatedAt, &user.UpdatedAt)
	if err != nil {
		log.Println(err)
		return err
	}
	return nil
}

func (user *User) Get() error {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return err
	}
	defer db.Close()
	err = db.QueryRow("SELECT id, name, email, password, slat, created_at, updated_at FROM users WHERE id = ?", user.ID).Scan(&user.ID, &user.Name, &user.Email, &user.Password, &user.Slat, &user.CreatedAt, &user.UpdatedAt)
	if err != nil {
		log.Println(err)
		return err
	}
	return nil
}

func (user *User) GetAll() ([]User, error) {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return nil, err
	}
	defer db.Close()
	rows, err := db.Query("SELECT id, name, email, created_at, updated_at FROM users")
	if err != nil {
		log.Println(err)
		return nil, err
	}
	defer rows.Close()
	var users []User
	for rows.Next() {
		var user User
		err := rows.Scan(&user.ID, &user.Name, &user.Email, &user.CreatedAt, &user.UpdatedAt)
		if err != nil {
			log.Println(err)
			return nil, err
		}
		users = append(users, user)
	}
	return users, nil
}

// 驗證用戶密碼
func (user *User) CheckPassword(password string) bool {
	return user.Password == fmt.Sprintf("%x", md5.Sum([]byte(password+user.Slat)))
}

// 使用Email和Password驗證登錄
func (user *User) CheckLogin(email, password string) bool {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return false
	}
	defer db.Close()
	err = db.QueryRow("SELECT id, name, email, password, slat, created_at, updated_at FROM users WHERE email = ?", email).Scan(&user.ID, &user.Name, &user.Email, &user.Password, &user.Slat, &user.CreatedAt, &user.UpdatedAt)
	if err != nil {
		log.Println(err)
		return false
	}
	if user.ID == 0 {
		fmt.Println("user not found")
		return false
	}
	if user.Password == "" {
		fmt.Println("password is empty")
		return false
	}
	if user.Password == fmt.Sprintf("%x", md5.Sum([]byte(password+user.Slat))) {
		return true
	}
	return false
}

// 獲取用戶實體
func GetUserByEmail(email string) (user User, err error) {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return
	}
	defer db.Close()
	err = db.QueryRow("SELECT id, name, email, password, slat, created_at, updated_at FROM users WHERE email = ?", email).Scan(&user.ID, &user.Name, &user.Email, &user.Password, &user.Slat, &user.CreatedAt, &user.UpdatedAt)
	if err != nil {
		log.Println(err)
		return
	}
	return
}

func QueryUserByEmail(email string) (user User, err error) {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return
	}
	defer db.Close()
	err = db.QueryRow("SELECT id, name, email, created_at, updated_at FROM users WHERE email = ?", email).Scan(&user.ID, &user.Name, &user.Email, &user.CreatedAt, &user.UpdatedAt)
	if err != nil {
		log.Println(err)
		return
	}
	return
}

func QueryUsers(page, pagesize int) (list []interface{}) {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return
	}
	defer db.Close()
	rows, err := db.Query("SELECT id, name, email, created_at, updated_at FROM users LIMIT ?, ?", (page-1)*pagesize, pagesize)
	if err != nil {
		log.Println(err)
		return
	}
	defer rows.Close()
	for rows.Next() {
		var user User
		err := rows.Scan(&user.ID, &user.Name, &user.Email, &user.CreatedAt, &user.UpdatedAt)
		if err != nil {
			log.Println(err)
			return
		}
		list = append(list, user)
	}
	return
}

func CountUsers() (count int) {
	db, err := configs.GetDB()
	if err != nil {
		log.Println(err)
		return
	}
	defer db.Close()
	err = db.QueryRow("SELECT COUNT(*) FROM users").Scan(&count)
	if err != nil {
		log.Println(err)
		return
	}
	return
}