import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../theme/app_theme.dart';
import '../widgets/custom_time_picker_dialog.dart';

class NotificationSettingsScreen extends StatefulWidget {
  const NotificationSettingsScreen({super.key});

  @override
  State<NotificationSettingsScreen> createState() => _NotificationSettingsScreenState();
}

class _NotificationSettingsScreenState extends State<NotificationSettingsScreen> {
  bool _goalReminderEnabled = true;
  bool _dailyReportEnabled = true;
  bool _weeklyReportEnabled = false;
  TimeOfDay _goalReminderTime = const TimeOfDay(hour: 20, minute: 0);
  TimeOfDay _dailyReportTime = const TimeOfDay(hour: 22, minute: 0);

  @override
  void initState() {
    super.initState();
    _loadSettings();
  }

  Future<void> _loadSettings() async {
    final prefs = await SharedPreferences.getInstance();
    setState(() {
      _goalReminderEnabled = prefs.getBool('goal_reminder_enabled') ?? true;
      _dailyReportEnabled = prefs.getBool('daily_report_enabled') ?? true;
      _weeklyReportEnabled = prefs.getBool('weekly_report_enabled') ?? false;
      
      final goalReminderHour = prefs.getInt('goal_reminder_hour') ?? 20;
      final goalReminderMinute = prefs.getInt('goal_reminder_minute') ?? 0;
      _goalReminderTime = TimeOfDay(hour: goalReminderHour, minute: goalReminderMinute);
      
      final dailyReportHour = prefs.getInt('daily_report_hour') ?? 22;
      final dailyReportMinute = prefs.getInt('daily_report_minute') ?? 0;
      _dailyReportTime = TimeOfDay(hour: dailyReportHour, minute: dailyReportMinute);
    });
  }

  Future<void> _saveSettings() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setBool('goal_reminder_enabled', _goalReminderEnabled);
    await prefs.setBool('daily_report_enabled', _dailyReportEnabled);
    await prefs.setBool('weekly_report_enabled', _weeklyReportEnabled);
    await prefs.setInt('goal_reminder_hour', _goalReminderTime.hour);
    await prefs.setInt('goal_reminder_minute', _goalReminderTime.minute);
    await prefs.setInt('daily_report_hour', _dailyReportTime.hour);
    await prefs.setInt('daily_report_minute', _dailyReportTime.minute);
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Scaffold(
      appBar: AppBar(
        title: const Text('通知设置'),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // 目标提醒
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      children: [
                        Icon(Icons.flag, color: AppTheme.primaryColor),
                        const SizedBox(width: 8),
                        Text(
                          '目标提醒',
                          style: theme.textTheme.titleMedium?.copyWith(
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 16),
                    SwitchListTile(
                      title: const Text('启用目标提醒'),
                      subtitle: const Text('当接近或超过时间目标时提醒'),
                      value: _goalReminderEnabled,
                      onChanged: (value) {
                        setState(() {
                          _goalReminderEnabled = value;
                        });
                        _saveSettings();
                      },
                    ),
                    if (_goalReminderEnabled) ...[
                      const SizedBox(height: 8),
                      ListTile(
                        title: const Text('提醒时间'),
                        subtitle: Text(
                          '${_goalReminderTime.hour.toString().padLeft(2, '0')}:${_goalReminderTime.minute.toString().padLeft(2, '0')}',
                        ),
                        trailing: const Icon(Icons.chevron_right),
                        onTap: () async {
                          final TimeOfDay? picked = await CustomTimePickerDialog.show(
                            context: context,
                            title: '选择提醒时间',
                            initialTime: _goalReminderTime,
                          );
                          if (picked != null) {
                            setState(() {
                              _goalReminderTime = picked;
                            });
                            await _saveSettings();
                          }
                        },
                      ),
                    ],
                  ],
                ),
              ),
            ),
            const SizedBox(height: 16),

            // 每日报告
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      children: [
                        Icon(Icons.today, color: AppTheme.primaryColor),
                        const SizedBox(width: 8),
                        Text(
                          '每日报告',
                          style: theme.textTheme.titleMedium?.copyWith(
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 16),
                    SwitchListTile(
                      title: const Text('启用每日报告'),
                      subtitle: const Text('每天发送使用时间摘要'),
                      value: _dailyReportEnabled,
                      onChanged: (value) {
                        setState(() {
                          _dailyReportEnabled = value;
                        });
                        _saveSettings();
                      },
                    ),
                    if (_dailyReportEnabled) ...[
                      const SizedBox(height: 8),
                      ListTile(
                        title: const Text('报告时间'),
                        subtitle: Text(
                          '${_dailyReportTime.hour.toString().padLeft(2, '0')}:${_dailyReportTime.minute.toString().padLeft(2, '0')}',
                        ),
                        trailing: const Icon(Icons.chevron_right),
                        onTap: () async {
                          final TimeOfDay? picked = await CustomTimePickerDialog.show(
                            context: context,
                            title: '选择报告时间',
                            initialTime: _dailyReportTime,
                          );
                          if (picked != null) {
                            setState(() {
                              _dailyReportTime = picked;
                            });
                            await _saveSettings();
                          }
                        },
                      ),
                    ],
                  ],
                ),
              ),
            ),
            const SizedBox(height: 16),

            // 每周报告
            Card(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      children: [
                        Icon(Icons.calendar_view_week, color: AppTheme.primaryColor),
                        const SizedBox(width: 8),
                        Text(
                          '每周报告',
                          style: theme.textTheme.titleMedium?.copyWith(
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                      ],
                    ),
                    const SizedBox(height: 16),
                    SwitchListTile(
                      title: const Text('启用每周报告'),
                      subtitle: const Text('每周一发送周报摘要'),
                      value: _weeklyReportEnabled,
                      onChanged: (value) {
                        setState(() {
                          _weeklyReportEnabled = value;
                        });
                        _saveSettings();
                      },
                    ),
                  ],
                ),
              ),
            ),
            const SizedBox(height: 24),

            // 说明
            Card(
              color: AppTheme.infoColor.withOpacity(0.1),
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: Row(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Icon(Icons.info_outline, color: AppTheme.infoColor),
                    const SizedBox(width: 12),
                    Expanded(
                      child: Text(
                        '通知功能需要系统通知权限。请在系统设置中授予通知权限。',
                        style: theme.textTheme.bodySmall?.copyWith(
                          color: theme.colorScheme.onSurface.withOpacity(0.7),
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}