import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:logging/logging.dart';

import '../controls/app_bottom_nav_bar.dart';
import '../controls/notifications_control.dart';
import '../controls/padding.dart';
import '../controls/responsive_max_width.dart';
import '../controls/standard_app_drawer.dart';
import '../controls/standard_appbar.dart';
import '../controls/status_and_refresh_button.dart';
import '../globals.dart';
import '../models/auth/profile.dart';
import '../models/user_notification.dart';
import '../riverpod_controllers/account_services.dart';
import '../riverpod_controllers/networking/network_status_services.dart';
import '../riverpod_controllers/notification_services.dart';
import '../riverpod_controllers/settings_services.dart';
import '../utils/snackbar_builder.dart';

class NotificationsScreen extends ConsumerWidget {
  static final _logger = Logger('$NotificationsScreen');

  const NotificationsScreen({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    _logger.finer('Building');
    final profile = ref.watch(activeProfileProvider);
    const title = 'Notifications';
    final loading = ref.watch(notificationsLoadingProvider(profile));
    late final Widget body;

    final actions = [
      if (platformIsDesktop)
        StatusAndRefreshButton(
          executing: loading,
          refreshFunction: () async => ref
              .read(notificationsManagerProvider(profile).notifier)
              .refreshNotifications(),
        ),
      IconButton(
        onPressed: () async => _clearAllNotifications(context, ref, profile),
        icon: const Icon(Icons.cleaning_services),
      ),
    ];

    final hasNoNotifications = !ref.watch(hasAnyNotificationsProvider(profile));
    if (hasNoNotifications) {
      body = RefreshIndicator(
        onRefresh: () async => ref
            .read(notificationsManagerProvider(profile).notifier)
            .refreshNotifications(),
        child: Center(
            child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: loading
              ? [
                  const Center(child: Text('Loading Notifications')),
                ]
              : [
                  const Center(child: Text('No notifications')),
                  const VerticalPadding(),
                  ElevatedButton(
                    onPressed: () => ref
                        .read(notificationsManagerProvider(profile).notifier)
                        .refreshNotifications(),
                    child: const Text('Load Notifications'),
                  )
                ],
        )),
      );
    } else {
      final groupNotifications = ref.watch(notificationGroupingSettingProvider);
      final notificationEntries = groupNotifications
          ? [
              ...orderedNotificationTypes.map((type) =>
                  _NotificationsByTypeListElement(
                      profile: profile, type: type, isRead: false)),
              _NotificationsByReadStatusListElement(
                  profile: profile, isRead: true),
            ]
          : [
              _NotificationsByReadStatusListElement(
                  profile: profile, isRead: false),
              _NotificationsByReadStatusListElement(
                  profile: profile, isRead: true),
            ];

      final allEntries = [
        TextButton(
            onPressed: () async {
              await ref
                  .read(notificationsManagerProvider(profile).notifier)
                  .loadNewerNotifications();
            },
            child: const Text('Load newer notifications')),
        ...notificationEntries,
        TextButton(
            onPressed: () async {
              await ref
                  .read(notificationsManagerProvider(profile).notifier)
                  .loadOlderNotifications();
            },
            child: const Text('Load older notifications'))
      ];

      body = RefreshIndicator(
          onRefresh: () async => ref
              .read(notificationsManagerProvider(profile).notifier)
              .refreshNotifications(),
          child: ResponsiveMaxWidth(
            child: ListView.separated(
              itemBuilder: (_, index) => allEntries[index],
              separatorBuilder: (_, __) => _standardDivider,
              itemCount: allEntries.length,
            ),
          ));
    }

    return Scaffold(
      appBar: StandardAppBar.build(
        context,
        title,
        withHome: false,
        withDrawer: true,
        actions: actions,
      ),
      drawer: const StandardAppDrawer(),
      body: Center(
        child: Column(
          children: [
            if (loading) const LinearProgressIndicator(),
            Expanded(
              child: ResponsiveMaxWidth(child: body),
            ),
          ],
        ),
      ),
      bottomNavigationBar: const AppBottomNavBar(
        currentButton: NavBarButtons.notifications,
      ),
    );
  }

  Future<void> _clearAllNotifications(
      BuildContext context, WidgetRef ref, Profile profile) async {
    final confirmed =
        await showYesNoDialog(context, 'Clear all notifications?');
    if (confirmed == true) {
      final message = (await ref
              .read(notificationsManagerProvider(profile).notifier)
              .markAllAsRead())
          .fold(
              onSuccess: (_) => 'Marked all notifications as read',
              onError: (error) => 'Error marking notifications: $error');
      if (context.mounted) {
        buildSnackbar(context, message);
      }
    }
  }
}

class _NotificationsByTypeListElement extends ConsumerWidget {
  final Profile profile;
  final NotificationType type;
  final bool isRead;

  const _NotificationsByTypeListElement(
      {required this.profile, required this.type, required this.isRead});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final notifications =
        ref.watch(userNotificationsByTypeProvider(profile, type, isRead));
    return ListView.separated(
      primary: false,
      shrinkWrap: true,
      itemBuilder: (_, index) =>
          NotificationControl(notification: notifications[index]),
      separatorBuilder: (_, __) => _standardDivider,
      itemCount: notifications.length,
    );
  }
}

class _NotificationsByReadStatusListElement extends ConsumerWidget {
  final Profile profile;
  final bool isRead;

  const _NotificationsByReadStatusListElement(
      {required this.profile, required this.isRead});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final notifications = ref.watch(allNotificationsProvider(profile, isRead));
    return ListView.separated(
      primary: false,
      shrinkWrap: true,
      itemBuilder: (_, index) =>
          NotificationControl(notification: notifications[index]),
      separatorBuilder: (_, __) => _standardDivider,
      itemCount: notifications.length,
    );
  }
}

final orderedNotificationTypes = [
  NotificationType.follow_request,
  NotificationType.follow,
  NotificationType.direct_message,
  NotificationType.mention,
  NotificationType.status,
  NotificationType.reshare,
  NotificationType.reblog,
  NotificationType.favourite,
  NotificationType.unknown,
];

const _standardDivider = Divider(
  color: Colors.black54,
  height: 0.0,
);