package db

import (
	"database/sql"
	"time"
)

// CreateUserTable 创建用户表
func CreateUserTable(db *sql.DB) error {
	createTableSQL := `
	CREATE TABLE IF NOT EXISTS sc_user (
		id INTEGER PRIMARY KEY AUTOINCREMENT,
		username VARCHAR(50) NOT NULL UNIQUE,
		email VARCHAR(100) NOT NULL UNIQUE,
		password_hash VARCHAR(255) NOT NULL,
		role VARCHAR(20) NOT NULL DEFAULT 'user',
		status VARCHAR(20) NOT NULL DEFAULT 'active',
		created_at DATETIME NOT NULL,
		updated_at DATETIME NOT NULL,
		last_login DATETIME
	);`

	_, err := db.Exec(createTableSQL)
	return err
}

// AddUser 添加新用户
func AddUser(user User) (*User, error) {
	// 使用全局数据库连接
	conn := GetSqliteDB()
	if conn == nil {
		return nil, ErrDbNotInit
	}

	insertSQL := `
	INSERT INTO sc_user (username, email, password_hash, role, status, created_at, updated_at, last_login)
	VALUES (?, ?, ?, ?, ?, ?, ?, ?)
	`

	result, err := conn.Exec(insertSQL,
		user.Username, user.Email, user.PasswordHash, user.Role,
		user.Status, user.CreatedAt, user.UpdatedAt, user.LastLogin,
	)
	if err != nil {
		return nil, err
	}

	// 获取插入的ID
	id, err := result.LastInsertId()
	if err != nil {
		return nil, err
	}

	// 设置ID并返回
	user.ID = int(id)
	return &user, nil
}

// GetUserByUsername 根据用户名获取用户
func GetUserByUsername(username string) (*User, error) {
	conn := GetSqliteDB()
	if conn == nil {
		return nil, ErrDbNotInit
	}

	querySQL := `
	SELECT id, username, email, password_hash, role, status, created_at, updated_at, last_login
	FROM sc_user WHERE username = ?
	`

	var user User
	err := conn.QueryRow(querySQL, username).Scan(
		&user.ID, &user.Username, &user.Email, &user.PasswordHash,
		&user.Role, &user.Status, &user.CreatedAt, &user.UpdatedAt, &user.LastLogin,
	)

	if err != nil {
		return nil, err
	}

	return &user, nil
}

// GetUserByEmail 根据邮箱获取用户
func GetUserByEmail(email string) (*User, error) {
	conn := GetSqliteDB()
	if conn == nil {
		return nil, ErrDbNotInit
	}

	querySQL := `
	SELECT id, username, email, password_hash, role, status, created_at, updated_at, last_login
	FROM sc_user WHERE email = ?
	`

	var user User
	err := conn.QueryRow(querySQL, email).Scan(
		&user.ID, &user.Username, &user.Email, &user.PasswordHash,
		&user.Role, &user.Status, &user.CreatedAt, &user.UpdatedAt, &user.LastLogin,
	)

	if err != nil {
		return nil, err
	}

	return &user, nil
}

// CheckUsernameExists 检查用户名是否存在
func CheckUsernameExists(username string) (bool, error) {
	conn := GetSqliteDB()
	if conn == nil {
		return false, ErrDbNotInit
	}

	querySQL := "SELECT COUNT(*) FROM sc_user WHERE username = ?"
	var count int
	err := conn.QueryRow(querySQL, username).Scan(&count)
	if err != nil {
		return false, err
	}

	return count > 0, nil
}

// CheckEmailExists 检查邮箱是否存在
func CheckEmailExists(email string) (bool, error) {
	conn := GetSqliteDB()
	if conn == nil {
		return false, ErrDbNotInit
	}

	querySQL := "SELECT COUNT(*) FROM sc_user WHERE email = ?"
	var count int
	err := conn.QueryRow(querySQL, email).Scan(&count)
	if err != nil {
		return false, err
	}

	return count > 0, nil
}

// UpdateUserPassword 更新用户密码
func UpdateUserPassword(userID int, passwordHash string, updatedAt time.Time) error {
	conn := GetSqliteDB()
	if conn == nil {
		return ErrDbNotInit
	}

	updateSQL := "UPDATE sc_user SET password_hash = ?, updated_at = ? WHERE id = ?"
	_, err := conn.Exec(updateSQL, passwordHash, updatedAt, userID)
	return err
}

// UpdateUserLastLogin 更新用户最后登录时间
func UpdateUserLastLogin(userID int) error {
	conn := GetSqliteDB()
	if conn == nil {
		return ErrDbNotInit
	}

	updateSQL := "UPDATE sc_user SET last_login = ? WHERE id = ?"
	_, err := conn.Exec(updateSQL, time.Now(), userID)
	return err
}