import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:sqflite/sqflite.dart';
import 'package:path/path.dart';

class DatabaseHelper {
  static final DatabaseHelper instance = DatabaseHelper._init();
  static Database? _database;

  DatabaseHelper._init();

  Future<Database> get database async {
    // Web 平台不支持 sqflite
    if (kIsWeb) {
      throw UnsupportedError('SQLite is not supported on Web platform. Use mock data instead.');
    }

    if (_database != null) return _database!;
    _database = await _initDB('autotime_tracker.db');
    return _database!;
  }

  Future<Database> _initDB(String filePath) async {
    // Web 平台不支持 sqflite
    if (kIsWeb) {
      throw UnsupportedError('SQLite is not supported on Web platform.');
    }

    final dbPath = await getDatabasesPath();
    final path = join(dbPath, filePath);

    return await openDatabase(
      path,
      version: 1,
      onCreate: _createDB,
    );
  }

  Future<void> _createDB(Database db, int version) async {
    // 应用使用记录表
    await db.execute('''
      CREATE TABLE app_usage (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        package_name TEXT NOT NULL,
        app_name TEXT NOT NULL,
        start_time INTEGER NOT NULL,
        end_time INTEGER NOT NULL,
        duration INTEGER NOT NULL,
        category TEXT NOT NULL,
        project_id INTEGER,
        device_unlock_count INTEGER DEFAULT 0,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    ''');

    // 每日统计表
    await db.execute('''
      CREATE TABLE daily_stats (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        date TEXT NOT NULL UNIQUE,
        total_time INTEGER NOT NULL,
        work_time INTEGER DEFAULT 0,
        study_time INTEGER DEFAULT 0,
        entertainment_time INTEGER DEFAULT 0,
        social_time INTEGER DEFAULT 0,
        tool_time INTEGER DEFAULT 0,
        efficiency_score INTEGER,
        focus_score INTEGER,
        app_switch_count INTEGER DEFAULT 0,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    ''');

    // 应用分类表
    await db.execute('''
      CREATE TABLE app_category (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        package_name TEXT NOT NULL UNIQUE,
        category TEXT NOT NULL,
        is_custom INTEGER DEFAULT 0,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    ''');

    // 时间目标表
    await db.execute('''
      CREATE TABLE time_goal (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        goal_type TEXT NOT NULL,
        category TEXT,
        target_time INTEGER NOT NULL,
        is_active INTEGER DEFAULT 1,
        created_at INTEGER NOT NULL,
        updated_at INTEGER NOT NULL
      )
    ''');

    // 创建索引
    await db.execute('CREATE INDEX idx_app_usage_date ON app_usage(start_time)');
    await db.execute('CREATE INDEX idx_app_usage_category ON app_usage(category)');
    await db.execute('CREATE INDEX idx_app_usage_package ON app_usage(package_name)');
    await db.execute('CREATE INDEX idx_daily_stats_date ON daily_stats(date)');
    await db.execute('CREATE INDEX idx_app_category_package ON app_category(package_name)');
  }

  // 关闭数据库
  Future<void> close() async {
    final db = await database;
    await db.close();
  }
}