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

class CategoryService {
  final DatabaseHelper _dbHelper = DatabaseHelper.instance;
  
  // Web 平台使用内存存储
  final Map<String, String> _webCustomCategories = {};

  // 预设分类规则
  static const Map<String, String> defaultCategories = {
    // 工作类
    'com.microsoft.Office.Word': 'work',
    'com.microsoft.Office.Excel': 'work',
    'com.microsoft.Office.PowerPoint': 'work',
    'com.slack': 'work',
    'com.notion.Notion': 'work',
    'com.figma.Figma': 'work',
    'com.github': 'work',
    'com.microsoft.VSCode': 'work',
    'com.jetbrains': 'work',
    'com.google.android.apps.docs': 'work',
    'com.google.android.apps.sheets': 'work',
    
    // 学习类
    'com.coursera': 'study',
    'com.khanacademy': 'study',
    'com.amazon.kindle': 'study',
    'com.gingerlabs.Notability': 'study',
    'com.goodnotes': 'study',
    'com.anki': 'study',
    'com.duolingo': 'study',
    
    // 娱乐类
    'com.google.YouTube': 'entertainment',
    'com.netflix.Netflix': 'entertainment',
    'com.spotify.music': 'entertainment',
    'com.spotify.client': 'entertainment',
    'com.disney': 'entertainment',
    
    // 社交类
    'net.whatsapp.WhatsApp': 'social',
    'com.instagram': 'social',
    'com.twitter': 'social',
    'com.facebook.Facebook': 'social',
    'com.tencent.mm': 'social', // 微信
    'com.tencent.mobileqq': 'social', // QQ
    
    // 工具类
    'com.apple.Safari': 'tool',
    'com.android.chrome': 'tool',
    'com.google.chrome': 'tool',
    'com.microsoft.edge': 'tool',
    'com.apple.mobilemail': 'tool',
    'com.google.Gmail': 'tool',
  };

  // 获取应用分类
  Future<String> getCategory(String packageName) async {
    // 1. 先查用户自定义分类
    final customCategory = await _getCustomCategory(packageName);
    if (customCategory != null) {
      return customCategory;
    }

    // 2. 查系统预设分类
    if (defaultCategories.containsKey(packageName)) {
      return defaultCategories[packageName]!;
    }

    // 3. 默认分类
    return 'other';
  }

  // 获取用户自定义分类
  Future<String?> _getCustomCategory(String packageName) async {
    // Web 平台使用内存存储
    if (kIsWeb) {
      return _webCustomCategories[packageName];
    }

    final db = await _dbHelper.database;
    final maps = await db.query(
      'app_category',
      where: 'package_name = ? AND is_custom = 1',
      whereArgs: [packageName],
    );

    if (maps.isEmpty) return null;
    return maps.first['category'] as String;
  }

  // 设置自定义分类
  Future<void> setCategory(String packageName, String category) async {
    // Web 平台使用内存存储
    if (kIsWeb) {
      _webCustomCategories[packageName] = category;
      return;
    }

    final db = await _dbHelper.database;
    final now = DateTime.now().millisecondsSinceEpoch ~/ 1000;

    await db.insert(
      'app_category',
      {
        'package_name': packageName,
        'category': category,
        'is_custom': 1,
        'created_at': now,
        'updated_at': now,
      },
      conflictAlgorithm: ConflictAlgorithm.replace,
    );
  }

  // 删除自定义分类（恢复为系统默认）
  Future<void> removeCustomCategory(String packageName) async {
    // Web 平台使用内存存储
    if (kIsWeb) {
      _webCustomCategories.remove(packageName);
      return;
    }

    final db = await _dbHelper.database;
    await db.delete(
      'app_category',
      where: 'package_name = ? AND is_custom = 1',
      whereArgs: [packageName],
    );
  }

  // 获取所有自定义分类
  Future<Map<String, String>> getAllCustomCategories() async {
    // Web 平台使用内存存储
    if (kIsWeb) {
      return Map<String, String>.from(_webCustomCategories);
    }

    final db = await _dbHelper.database;
    final maps = await db.query(
      'app_category',
      where: 'is_custom = 1',
    );

    final result = <String, String>{};
    for (final map in maps) {
      result[map['package_name'] as String] = map['category'] as String;
    }
    return result;
  }

  // 批量设置分类
  Future<void> batchSetCategories(Map<String, String> categories) async {
    // Web 平台使用内存存储
    if (kIsWeb) {
      _webCustomCategories.addAll(categories);
      return;
    }

    final db = await _dbHelper.database;
    final batch = db.batch();
    final now = DateTime.now().millisecondsSinceEpoch ~/ 1000;

    for (final entry in categories.entries) {
      batch.insert(
        'app_category',
        {
          'package_name': entry.key,
          'category': entry.value,
          'is_custom': 1,
          'created_at': now,
          'updated_at': now,
        },
        conflictAlgorithm: ConflictAlgorithm.replace,
      );
    }

    await batch.commit(noResult: true);
  }
}