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

class TimeGoalDao {
  final DatabaseHelper _dbHelper = DatabaseHelper.instance;

  // Web 平台使用内存存储
  final List<TimeGoal> _webGoals = [];

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

  // 插入或更新时间目标
  Future<void> upsertTimeGoal(TimeGoal goal) async {
    if (_isWeb) {
      // Web 平台使用内存存储
      final index = _webGoals.indexWhere((g) => 
        g.goalType == goal.goalType && g.category == goal.category);
      if (index >= 0) {
        _webGoals[index] = goal;
      } else {
        _webGoals.add(goal);
      }
      return;
    }

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

    final map = {
      'goal_type': goal.goalType,
      'category': goal.category,
      'target_time': goal.targetTime,
      'is_active': goal.isActive ? 1 : 0,
      'created_at': now,
      'updated_at': now,
    };

    // 检查是否已存在相同类型的目标
    final existing = await db.query(
      'time_goal',
      where: 'goal_type = ? AND (category = ? OR category IS NULL)',
      whereArgs: [
        goal.goalType,
        goal.category,
      ],
    );

    if (existing.isEmpty) {
      await db.insert('time_goal', map);
    } else {
      await db.update(
        'time_goal',
        map,
        where: 'goal_type = ? AND (category = ? OR category IS NULL)',
        whereArgs: [
          goal.goalType,
          goal.category,
        ],
      );
    }
  }

  // 获取所有激活的目标
  Future<List<TimeGoal>> getActiveGoals() async {
    if (_isWeb) {
      return _webGoals.where((g) => g.isActive).toList();
    }

    final db = await _dbHelper.database;
    final maps = await db.query(
      'time_goal',
      where: 'is_active = 1',
      orderBy: 'goal_type, category',
    );

    return maps.map((map) => TimeGoal.fromMap(map)).toList();
  }

  // 获取所有目标（包括非激活的）
  Future<List<TimeGoal>> getAllGoals() async {
    if (_isWeb) {
      return List<TimeGoal>.from(_webGoals);
    }

    final db = await _dbHelper.database;
    final maps = await db.query(
      'time_goal',
      orderBy: 'goal_type, category',
    );

    return maps.map((map) => TimeGoal.fromMap(map)).toList();
  }

  // 获取指定类型的目标
  Future<TimeGoal?> getGoal(String goalType, {String? category}) async {
    final db = await _dbHelper.database;
    final maps = await db.query(
      'time_goal',
      where: 'goal_type = ? AND (category = ? OR category IS NULL) AND is_active = 1',
      whereArgs: [goalType, category],
    );

    if (maps.isEmpty) return null;
    return TimeGoal.fromMap(maps.first);
  }

  // 删除目标
  Future<void> deleteGoal(int id) async {
    final db = await _dbHelper.database;
    await db.delete(
      'time_goal',
      where: 'id = ?',
      whereArgs: [id],
    );
  }

  // 停用目标
  Future<void> deactivateGoal(int id) async {
    final db = await _dbHelper.database;
    await db.update(
      'time_goal',
      {'is_active': 0, 'updated_at': DateTime.now().millisecondsSinceEpoch ~/ 1000},
      where: 'id = ?',
      whereArgs: [id],
    );
  }
}