import 'package:flutter/foundation.dart' show kIsWeb;
import '../models/app_usage.dart';
import 'database_helper.dart';

class AppUsageDao {
  final DatabaseHelper _dbHelper = DatabaseHelper.instance;

  // Web 平台检查
  bool get _isWeb => kIsWeb;

  // 插入应用使用记录
  Future<int> insertAppUsage(AppUsage usage) async {
    final db = await _dbHelper.database;
    return await db.insert('app_usage', usage.toMap());
  }

  // 批量插入
  Future<void> batchInsertAppUsages(List<AppUsage> usages) async {
    final db = await _dbHelper.database;
    final batch = db.batch();
    for (final usage in usages) {
      batch.insert('app_usage', usage.toMap());
    }
    await batch.commit(noResult: true);
  }

  // 获取指定时间范围的应用使用记录
  Future<List<AppUsage>> getAppUsages({
    required DateTime startTime,
    required DateTime endTime,
  }) async {
    if (_isWeb) return [];
    
    final db = await _dbHelper.database;
    final startTimestamp = startTime.millisecondsSinceEpoch ~/ 1000;
    final endTimestamp = endTime.millisecondsSinceEpoch ~/ 1000;

    final maps = await db.query(
      'app_usage',
      where: 'start_time >= ? AND end_time <= ?',
      whereArgs: [startTimestamp, endTimestamp],
      orderBy: 'start_time DESC',
    );

    return maps.map((map) {
      return AppUsage(
        id: map['id'] as int?,
        packageName: map['package_name'] as String,
        appName: map['app_name'] as String,
        startTime: DateTime.fromMillisecondsSinceEpoch((map['start_time'] as int) * 1000),
        endTime: DateTime.fromMillisecondsSinceEpoch((map['end_time'] as int) * 1000),
        duration: map['duration'] as int,
        category: map['category'] as String,
        projectId: map['project_id'] as int?,
        deviceUnlockCount: map['device_unlock_count'] as int,
        createdAt: DateTime.fromMillisecondsSinceEpoch((map['created_at'] as int) * 1000),
        updatedAt: DateTime.fromMillisecondsSinceEpoch((map['updated_at'] as int) * 1000),
      );
    }).toList();
  }

  // 获取今日应用使用记录
  Future<List<AppUsage>> getTodayAppUsages() async {
    final now = DateTime.now();
    final startOfDay = DateTime(now.year, now.month, now.day);
    final endOfDay = startOfDay.add(const Duration(days: 1));
    return await getAppUsages(startTime: startOfDay, endTime: endOfDay);
  }

  // 获取 Top N 应用
  Future<List<AppUsage>> getTopApps({
    required DateTime startTime,
    required DateTime endTime,
    int limit = 10,
  }) async {
    if (_isWeb) return [];
    
    final db = await _dbHelper.database;
    final startTimestamp = startTime.millisecondsSinceEpoch ~/ 1000;
    final endTimestamp = endTime.millisecondsSinceEpoch ~/ 1000;

    final maps = await db.rawQuery('''
      SELECT 
        package_name,
        app_name,
        category,
        SUM(duration) as total_duration,
        MIN(start_time) as first_start_time,
        MAX(end_time) as last_end_time,
        MIN(created_at) as created_at,
        MAX(updated_at) as updated_at
      FROM app_usage
      WHERE start_time >= ? AND end_time <= ?
      GROUP BY package_name, app_name, category
      ORDER BY total_duration DESC
      LIMIT ?
    ''', [startTimestamp, endTimestamp, limit]);

    return maps.map((map) {
      final firstStart = DateTime.fromMillisecondsSinceEpoch((map['first_start_time'] as int) * 1000);
      final lastEnd = DateTime.fromMillisecondsSinceEpoch((map['last_end_time'] as int) * 1000);
      return AppUsage(
        packageName: map['package_name'] as String,
        appName: map['app_name'] as String,
        startTime: firstStart,
        endTime: lastEnd,
        duration: map['total_duration'] as int,
        category: map['category'] as String,
        createdAt: DateTime.fromMillisecondsSinceEpoch((map['created_at'] as int) * 1000),
        updatedAt: DateTime.fromMillisecondsSinceEpoch((map['updated_at'] as int) * 1000),
      );
    }).toList();
  }

  // 更新应用分类
  Future<void> updateAppUsageCategory(int id, String category) async {
    final db = await _dbHelper.database;
    await db.update(
      'app_usage',
      {
        'category': category,
        'updated_at': DateTime.now().millisecondsSinceEpoch ~/ 1000,
      },
      where: 'id = ?',
      whereArgs: [id],
    );
  }

  // 删除应用使用记录
  Future<void> deleteAppUsage(int id) async {
    if (_isWeb) return;
    
    final db = await _dbHelper.database;
    await db.delete(
      'app_usage',
      where: 'id = ?',
      whereArgs: [id],
    );
  }

  // 删除指定日期之前的数据（用于数据清理）
  Future<void> deleteBeforeDate(DateTime date) async {
    if (_isWeb) return;
    
    final db = await _dbHelper.database;
    final timestamp = date.millisecondsSinceEpoch ~/ 1000;
    await db.delete(
      'app_usage',
      where: 'start_time < ?',
      whereArgs: [timestamp],
    );
  }
}