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

class DailyStatsDao {
  final DatabaseHelper _dbHelper = DatabaseHelper.instance;

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

  // 插入或更新每日统计
  Future<void> upsertDailyStats(DailyStats stats) async {
    final db = await _dbHelper.database;
    final dateStr = _formatDate(stats.date);
    final map = stats.toMap();
    
    final existing = await db.query(
      'daily_stats',
      where: 'date = ?',
      whereArgs: [dateStr],
    );

    if (existing.isEmpty) {
      await db.insert('daily_stats', map);
    } else {
      await db.update(
        'daily_stats',
        map,
        where: 'date = ?',
        whereArgs: [dateStr],
      );
    }
  }

  // 获取指定日期的统计
  Future<DailyStats?> getDailyStats(DateTime date) async {
    final db = await _dbHelper.database;
    final dateStr = _formatDate(date);

    final maps = await db.query(
      'daily_stats',
      where: 'date = ?',
      whereArgs: [dateStr],
    );

    if (maps.isEmpty) return null;

    return _mapToDailyStats(maps.first);
  }

  // 获取今日统计
  Future<DailyStats?> getTodayStats() async {
    return await getDailyStats(DateTime.now());
  }

  // 获取指定日期范围的统计
  Future<List<DailyStats>> getStatsRange({
    required DateTime startDate,
    required DateTime endDate,
  }) async {
    if (_isWeb) return [];
    
    final db = await _dbHelper.database;
    final startStr = _formatDate(startDate);
    final endStr = _formatDate(endDate);

    final maps = await db.query(
      'daily_stats',
      where: 'date >= ? AND date <= ?',
      whereArgs: [startStr, endStr],
      orderBy: 'date ASC',
    );

    return maps.map((map) => _mapToDailyStats(map)).toList();
  }

  // 获取本周统计
  Future<List<DailyStats>> getWeekStats() async {
    final now = DateTime.now();
    final startOfWeek = now.subtract(Duration(days: now.weekday - 1));
    final endOfWeek = startOfWeek.add(const Duration(days: 6));
    return await getStatsRange(startDate: startOfWeek, endDate: endOfWeek);
  }

  // 获取本月统计
  Future<List<DailyStats>> getMonthStats() async {
    final now = DateTime.now();
    final startOfMonth = DateTime(now.year, now.month, 1);
    final endOfMonth = DateTime(now.year, now.month + 1, 0);
    return await getStatsRange(startDate: startOfMonth, endDate: endOfMonth);
  }

  // 删除指定日期之前的数据
  Future<void> deleteBeforeDate(DateTime date) async {
    if (_isWeb) return;
    
    final db = await _dbHelper.database;
    final dateStr = _formatDate(date);
    await db.delete(
      'daily_stats',
      where: 'date < ?',
      whereArgs: [dateStr],
    );
  }

  // 删除指定 ID 的统计
  Future<void> deleteDailyStats(int id) async {
    if (_isWeb) return;
    
    final db = await _dbHelper.database;
    await db.delete(
      'daily_stats',
      where: 'id = ?',
      whereArgs: [id],
    );
  }

  String _formatDate(DateTime date) {
    return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
  }

  DailyStats _mapToDailyStats(Map<String, dynamic> map) {
    return DailyStats(
      id: map['id'] as int?,
      date: DateTime.parse(map['date'] as String),
      totalTime: map['total_time'] as int,
      workTime: map['work_time'] as int? ?? 0,
      studyTime: map['study_time'] as int? ?? 0,
      entertainmentTime: map['entertainment_time'] as int? ?? 0,
      socialTime: map['social_time'] as int? ?? 0,
      toolTime: map['tool_time'] as int? ?? 0,
      efficiencyScore: map['efficiency_score'] as int?,
      focusScore: map['focus_score'] as int?,
      appSwitchCount: map['app_switch_count'] as int? ?? 0,
      createdAt: DateTime.fromMillisecondsSinceEpoch((map['created_at'] as int) * 1000),
      updatedAt: DateTime.fromMillisecondsSinceEpoch((map['updated_at'] as int) * 1000),
    );
  }
}

// 扩展 DailyStats 模型，添加 toMap 方法
extension DailyStatsExtension on DailyStats {
  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'date': _formatDate(date),
      'total_time': totalTime,
      'work_time': workTime,
      'study_time': studyTime,
      'entertainment_time': entertainmentTime,
      'social_time': socialTime,
      'tool_time': toolTime,
      'efficiency_score': efficiencyScore,
      'focus_score': focusScore,
      'app_switch_count': appSwitchCount,
      'created_at': createdAt.millisecondsSinceEpoch ~/ 1000,
      'updated_at': updatedAt.millisecondsSinceEpoch ~/ 1000,
    };
  }

  String _formatDate(DateTime date) {
    return '${date.year}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
  }
}