package models

import (
	"database/sql"
	"time"
)

type User struct {
	ID        uint       `json:"id"`
	Username  string     `json:"username"`
	Email     string     `json:"email"`
	Role      string     `json:"role"` // admin or user
	CreatedAt time.Time  `json:"created_at"`
	UpdatedAt time.Time  `json:"updated_at"`
	DeletedAt *time.Time `json:"deleted_at,omitempty"`
}

type Session struct {
	ID        string     `json:"id"`
	UserID    uint       `json:"user_id"`
	ExpiresAt time.Time  `json:"expires_at"`
	CreatedAt time.Time  `json:"created_at"`
	UpdatedAt time.Time  `json:"updated_at"`
	DeletedAt *time.Time `json:"deleted_at,omitempty"`
}

// CreateUserTableSQL 返回创建用户表的 SQL
func CreateUserTableSQL() string {
	return `
	CREATE TABLE IF NOT EXISTS user (
		id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
		username VARCHAR(255) UNIQUE NOT NULL,
		email VARCHAR(255) UNIQUE NOT NULL,
		role VARCHAR(50) NOT NULL DEFAULT 'user',
		created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
		updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
		deleted_at TIMESTAMP NULL
	) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci`
}

// CreateSessionTableSQL 返回创建会话表的 SQL
func CreateSessionTableSQL() string {
	return `
	CREATE TABLE IF NOT EXISTS session (
		id VARCHAR(255) PRIMARY KEY,
		user_id BIGINT UNSIGNED NOT NULL,
		expires_at TIMESTAMP NOT NULL,
		created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
		updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
		deleted_at TIMESTAMP NULL,
		FOREIGN KEY (user_id) REFERENCES user(id)
	) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci`
}

// GetUser 获取会话关联的用户
func (s *Session) GetUser(db *sql.DB) (*User, error) {
	var user User
	err := db.QueryRow("SELECT id, username, email, role, created_at, updated_at, deleted_at FROM user WHERE id = ?", s.UserID).Scan(
		&user.ID, &user.Username, &user.Email, &user.Role, &user.CreatedAt, &user.UpdatedAt, &user.DeletedAt)
	if err != nil {
		return nil, err
	}
	return &user, nil
}