import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:real_estate_mobile/core/constants/app_colors.dart';
import 'package:real_estate_mobile/features/profile/presentation/providers/profile_provider.dart';
import 'package:real_estate_mobile/features/profile/presentation/widgets/profile_shared_widgets.dart';

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

  @override
  ConsumerState<NotificationsTab> createState() => _NotificationsTabState();
}

class _NotificationsTabState extends ConsumerState<NotificationsTab> {
  final Map<String, Map<String, bool>> _notificationPrefs = {
    'newLeadAlerts': {'email': true, 'inApp': true},
    'messageUpdates': {'email': false, 'inApp': true},
    'urgentRequests': {'email': true, 'inApp': true},
  };
  String _digestFrequency = 'instant';
  bool _notificationsLoaded = false;
  bool _isLoadingNotifications = false;
  bool _isSavingNotifications = false;

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

  Future<void> _loadNotificationPreferences() async {
    if (_notificationsLoaded) return;
    setState(() => _isLoadingNotifications = true);
    try {
      final role = ref.read(profileProvider).role;
      final repo = ref.read(profileRepositoryProvider);
      final data = await repo.getNotificationPreferences(role);
      final notifications =
          data['notifications'] as Map<String, dynamic>? ?? {};
      setState(() {
        for (final key in ['new_lead_alerts', 'message_updates', 'urgent_requests_tours']) {
          final mapped = key == 'new_lead_alerts'
              ? 'newLeadAlerts'
              : key == 'message_updates'
                  ? 'messageUpdates'
                  : 'urgentRequests';
          final vals = notifications[key] as Map<String, dynamic>?;
          if (vals != null) {
            _notificationPrefs[mapped] = {
              'email': vals['email'] as bool? ?? false,
              'inApp': vals['inApp'] as bool? ?? true,
            };
          }
        }
        _digestFrequency = data['digestFrequency'] as String? ?? 'instant';
        _isLoadingNotifications = false;
        _notificationsLoaded = true;
      });
    } catch (_) {
      setState(() {
        _isLoadingNotifications = false;
        _notificationsLoaded = true;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    if (_isLoadingNotifications) {
      return const Center(
          child: CircularProgressIndicator(color: AppColors.accentOrange));
    }

    return ListView(
      padding: const EdgeInsets.fromLTRB(27, 10, 27, 30),
      children: [
        const Text(
          'Notification Preferences',
          style: TextStyle(
            fontFamily: 'Fractul',
            fontSize: 15,
            fontWeight: FontWeight.w700,
            color: AppColors.primaryDark,
          ),
        ),
        const SizedBox(height: 8),
        const Text(
          'Choose what you want to be notified about and how.',
          style: TextStyle(
            fontFamily: 'SourceSerif4',
            fontSize: 14,
            fontWeight: FontWeight.w400,
            color: AppColors.primaryDark,
          ),
        ),
        const SizedBox(height: 20),
        _buildSectionDivider(),
        const SizedBox(height: 19),
        _buildNotificationCategory(
          title: 'New Lead Alerts',
          description: 'Notifications about new leads and inquiries.',
          prefKey: 'newLeadAlerts',
        ),
        _buildSectionDivider(),
        const SizedBox(height: 13),
        _buildNotificationCategory(
          title: 'Message Updates',
          description:
              'Notices about new messages from clients or other agents.',
          prefKey: 'messageUpdates',
        ),
        _buildSectionDivider(),
        const SizedBox(height: 16),
        _buildNotificationCategory(
          title: 'Urgent Requests & Tours',
          description:
              'Immediate notifications for tour requests and time-sensitive items.',
          prefKey: 'urgentRequests',
        ),
        _buildSectionDivider(),
        const SizedBox(height: 20),
        const Text(
          'Email Digest Frequency',
          style: TextStyle(
            fontFamily: 'Fractul',
            fontSize: 14,
            fontWeight: FontWeight.w700,
            color: AppColors.primaryDark,
          ),
        ),
        const SizedBox(height: 8),
        const Text(
          'Choose how often you receive non-urgent email summaries',
          style: TextStyle(
            fontFamily: 'SourceSerif4',
            fontSize: 14,
            fontWeight: FontWeight.w400,
            color: AppColors.primaryDark,
          ),
        ),
        const SizedBox(height: 16),
        _buildFrequencySelector(),
        const SizedBox(height: 40),
        ProfileActionButtons(
          onSave: _saveNotificationSettings,
          onCancel: () => context.go('/home'),
          isSaving: _isSavingNotifications,
        ),
      ],
    );
  }

  Future<void> _saveNotificationSettings() async {
    setState(() => _isSavingNotifications = true);
    try {
      final role = ref.read(profileProvider).role;
      final repo = ref.read(profileRepositoryProvider);
      await repo.updateNotificationPreferences(role, {
        'notifications': {
          'new_lead_alerts': _notificationPrefs['newLeadAlerts'],
          'message_updates': _notificationPrefs['messageUpdates'],
          'urgent_requests_tours': _notificationPrefs['urgentRequests'],
        },
        'digestFrequency': _digestFrequency,
      });
      _showSnackBar('Notification settings saved');
    } catch (e) {
      _showSnackBar('Failed to save: $e', isError: true);
    } finally {
      if (mounted) setState(() => _isSavingNotifications = false);
    }
  }

  Widget _buildSectionDivider() {
    return Divider(
      color: AppColors.primaryDark.withValues(alpha: 0.15),
      height: 1,
      thickness: 1,
    );
  }

  Widget _buildNotificationCategory({
    required String title,
    required String description,
    required String prefKey,
  }) {
    final prefs = _notificationPrefs[prefKey]!;
    return Padding(
      padding: const EdgeInsets.only(bottom: 16),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(title,
                    style: const TextStyle(
                      fontFamily: 'Fractul',
                      fontSize: 14,
                      fontWeight: FontWeight.w700,
                      color: AppColors.primaryDark,
                    )),
                const SizedBox(height: 4),
                Text(description,
                    style: const TextStyle(
                      fontFamily: 'SourceSerif4',
                      fontSize: 14,
                      fontWeight: FontWeight.w400,
                      color: AppColors.primaryDark,
                    )),
              ],
            ),
          ),
          const SizedBox(width: 20),
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              _buildCheckboxRow(
                label: 'Email',
                value: prefs['email']!,
                onChanged: (val) {
                  setState(() {
                    _notificationPrefs[prefKey]!['email'] = val ?? false;
                  });
                },
              ),
              const SizedBox(height: 6),
              _buildCheckboxRow(
                label: 'In-App',
                value: prefs['inApp']!,
                onChanged: (val) {
                  setState(() {
                    _notificationPrefs[prefKey]!['inApp'] = val ?? false;
                  });
                },
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildCheckboxRow({
    required String label,
    required bool value,
    required ValueChanged<bool?> onChanged,
  }) {
    return GestureDetector(
      onTap: () => onChanged(!value),
      behavior: HitTestBehavior.opaque,
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          SizedBox(
            width: 18,
            height: 18,
            child: Checkbox(
              value: value,
              onChanged: onChanged,
              activeColor: AppColors.primaryDark,
              checkColor: Colors.white,
              materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
              visualDensity: VisualDensity.compact,
              shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(3)),
              side: BorderSide(
                color: AppColors.primaryDark.withValues(alpha: 0.4),
                width: 1,
              ),
            ),
          ),
          const SizedBox(width: 4),
          Text(label,
              style: const TextStyle(
                fontFamily: 'SourceSerif4',
                fontSize: 14,
                fontWeight: FontWeight.w400,
                color: AppColors.primaryDark,
              )),
        ],
      ),
    );
  }

  Widget _buildFrequencySelector() {
    const options = ['instant', 'daily', 'weekly', 'off'];
    const labels = ['Instant', 'Daily', 'Weekly', 'Off'];

    return Container(
      height: 32,
      width: 278,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(7),
        border: Border.all(
          color: AppColors.primaryDark.withValues(alpha: 0.15),
          width: 1,
        ),
      ),
      child: ClipRRect(
        borderRadius: BorderRadius.circular(6),
        child: Row(
          children: List.generate(options.length * 2 - 1, (index) {
            if (index.isOdd) {
              return Container(
                width: 1,
                height: 32,
                color: AppColors.primaryDark.withValues(alpha: 0.15),
              );
            }
            final i = index ~/ 2;
            final isSelected = _digestFrequency == options[i];
            return Expanded(
              child: GestureDetector(
                onTap: () => setState(() => _digestFrequency = options[i]),
                child: Center(
                  child: isSelected
                      ? Container(
                          height: 24,
                          margin: const EdgeInsets.symmetric(horizontal: 3),
                          decoration: BoxDecoration(
                            color: AppColors.accentOrange,
                            borderRadius: BorderRadius.circular(15),
                          ),
                          alignment: Alignment.center,
                          child: Text(labels[i],
                              style: const TextStyle(
                                fontFamily: 'SourceSerif4',
                                fontSize: 12,
                                fontWeight: FontWeight.w400,
                                color: AppColors.primaryDark,
                                height: 1.0,
                              )),
                        )
                      : Text(labels[i],
                          style: const TextStyle(
                            fontFamily: 'SourceSerif4',
                            fontSize: 12,
                            fontWeight: FontWeight.w400,
                            color: AppColors.primaryDark,
                            height: 1.0,
                          )),
                ),
              ),
            );
          }),
        ),
      ),
    );
  }

  void _showSnackBar(String message, {bool isError = false}) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message),
        backgroundColor: isError ? Colors.red : const Color(0xFF638559),
      ),
    );
  }
}