import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:health/health.dart';
import '../../providers/user_provider.dart';
import '../../services/health_service.dart';

class PrivacySettingsScreen extends ConsumerStatefulWidget {
  const PrivacySettingsScreen({super.key});

  @override
  ConsumerState<PrivacySettingsScreen> createState() =>
      _PrivacySettingsScreenState();
}

class _PrivacySettingsScreenState extends ConsumerState<PrivacySettingsScreen> {
  bool _hasPermissions = false;
  final HealthService _healthService = HealthService();

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

  Future<void> _checkPermissions() async {
    final hasPermissions = await _healthService.hasPermissions(_healthService.menstruationDataTypes);
    setState(() {
      _hasPermissions = hasPermissions;
    });
  }

  Future<void> _requestPermissions() async {
    final authorized = await _healthService.requestAuthorization(_healthService.menstruationDataTypes);
    if (authorized) {
      _hasPermissions = true;
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Health app access granted!')),
      );
    } else {
      _hasPermissions = false;
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Health app access denied.')),
      );
    }
    setState(() {}); // Rebuild to update UI
  }

  Future<void> _syncPeriodDays(bool sync) async {
    if (sync) {
      if (!_hasPermissions) {
        // Request permissions if not already granted
        final authorized = await _healthService.requestAuthorization(_healthService.menstruationDataTypes);
        if (!authorized) {
          if (mounted) {
            ScaffoldMessenger.of(context).showSnackBar(
              const SnackBar(content: Text('Cannot sync without health app permissions.')),
            );
          }
          return;
        }
        _hasPermissions = true;
      }

      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Syncing period data...')),
        );
      }
      final userProfile = ref.read(userProfileProvider);
      final cycleEntries = ref.read(cycleEntriesProvider);

      if (userProfile != null) {
        final success = await _healthService.writeMenstruationData(cycleEntries);
        if (mounted) {
          if (success) {
            ScaffoldMessenger.of(context).showSnackBar(
              const SnackBar(content: Text('Period data synced successfully!')),
            );
            // Optionally store a flag in userProfile if sync is active
            // userProfile.copyWith(syncPeriodToHealth: true)
          } else {
            ScaffoldMessenger.of(context).showSnackBar(
              const SnackBar(content: Text('Failed to sync period data.')),
            );
          }
        }
      }
    } else {
      // Logic to disable sync (e.g., revoke permissions if Health package supports it,
      // or just stop writing data in future)
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Period data sync disabled.')),
        );
      }
    }
    setState(() {}); // Rebuild to update UI
  }

  @override
  Widget build(BuildContext context) {
    // This value would ideally come from userProfile.syncPeriodToHealth
    bool syncPeriodToHealth = _hasPermissions;

    return Scaffold(
      appBar: AppBar(
        title: const Text('Privacy Settings'),
      ),
      body: ListView(
        padding: const EdgeInsets.all(16.0),
        children: [
          ListTile(
            title: const Text('Health App Integration'),
            subtitle: _hasPermissions
                ? const Text('Connected to Health App. Period data can be synced.')
                : const Text('Not connected. Tap to grant access.'),
            trailing: _hasPermissions ? const Icon(Icons.check_circle, color: Colors.green) : const Icon(Icons.warning, color: Colors.orange),
            onTap: _requestPermissions,
          ),
          SwitchListTile(
            title: const Text('Sync Period Days'),
            subtitle: const Text('Automatically sync your period start and end dates to your health app.'),
            value: syncPeriodToHealth,
            onChanged: (value) async {
              if (value) {
                await _syncPeriodDays(true);
              } else {
                await _syncPeriodDays(false);
              }
              setState(() {
                syncPeriodToHealth = value; // Update local state for toggle
              });
            },
            enabled: _hasPermissions, // Only enable if connected
          ),
          // TODO: Add more privacy settings if needed
        ],
      ),
    );
  }
}