import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:test_sa/controllers/providers/api/notifications_provider.dart';
import 'package:test_sa/controllers/providers/api/user_provider.dart';
import 'package:test_sa/extensions/context_extension.dart';
import 'package:test_sa/extensions/int_extensions.dart';
import 'package:test_sa/extensions/string_extensions.dart';
import 'package:test_sa/extensions/text_extensions.dart';
import 'package:test_sa/extensions/widget_extensions.dart';
import 'package:test_sa/models/notification_filter_model.dart';
import 'package:test_sa/models/system_notification_model.dart';
import 'package:test_sa/new_views/app_style/app_color.dart';
import 'package:test_sa/new_views/common_widgets/app_text_form_field.dart';
import 'package:test_sa/new_views/common_widgets/default_app_bar.dart';
import 'package:test_sa/views/pages/user/notifications/notification_filter_page.dart';
import 'package:test_sa/views/pages/user/notifications/notifications_list.dart';
import 'package:test_sa/views/pages/user/notifications/widgets/notification_tab_button.dart';
import 'dart:async';

import '../../../widgets/loaders/loading_manager.dart';

class NotificationsPage extends StatefulWidget {
  static const String id = "/notifications";

  const NotificationsPage({Key? key}) : super(key: key);

  @override
  _NotificationsPageState createState() => _NotificationsPageState();
}

class _NotificationsPageState extends State<NotificationsPage> with TickerProviderStateMixin {
  late NotificationsProvider _notificationsProvider;
  late UserProvider _userProvider;

  final TextEditingController _searchController = TextEditingController();
  int _selectedTabIndex = 0; // 0: All, 1: Unread, 2: Read
  String _searchQuery = '';
  bool isAscending = false;
  NotificationFilterModel? _activeFilters;
  Timer? _debounceTimer;

  @override
  void initState() {
    super.initState();
    // Initialize filter model with default isRead = 0 (All)
    _activeFilters = NotificationFilterModel(isRead: 0);

    // Load notifications when page loads
    WidgetsBinding.instance.addPostFrameCallback((_) {
      _loadNotifications();
    });
  }

  @override
  void dispose() {
    _searchController.dispose();
    _debounceTimer?.cancel();
    super.dispose();
  }

  /// Load notifications from API
  Future<void> _loadNotifications() async {
    final notificationsProvider = Provider.of<NotificationsProvider>(context, listen: false);
    final userProvider = Provider.of<UserProvider>(context, listen: false);

    // Update filter model with search, sort, and tab selection
    _activeFilters ??= NotificationFilterModel();
    _activeFilters!.searchText = _searchQuery.isEmpty ? null : _searchQuery;
    _activeFilters!.isAscending = isAscending;
    _activeFilters!.isRead = _selectedTabIndex; // 0 = All, 1 = Unread, 2 = Read

    // Reset and fetch fresh data with filters
    notificationsProvider.reset();
    await notificationsProvider.getSystemNotifications(
      user: userProvider.user!,
      resetProvider: true,
      filters: _activeFilters,
    );
  }

  /// Handle search with debounce
  void _onSearchChanged(String value) {
    setState(() {
      _searchQuery = value;
    });

    // Cancel previous timer
    _debounceTimer?.cancel();

    // Start new timer (500ms debounce)
    _debounceTimer = Timer(const Duration(milliseconds: 500), () {
      _loadNotifications();
    });
  }

  /// Toggle sort order and reload data
  void _toggleSort() {
    setState(() {
      isAscending = !isAscending;
    });
    _loadNotifications();
  }

  List<SystemNotificationModel> get _filteredNotifications {
    // Tab filtering is now handled by API via isRead parameter
    // No need for local filtering
    return _notificationsProvider.notifications;
  }

  int get _unreadCount {
    return _notificationsProvider.notifications.where((n) => !(n.readed ?? false)).length;
  }

  int get _allCount {
    return _notificationsProvider.notifications.length;
  }

  int get _readCount {
    return _notificationsProvider.notifications.where((n) => n.readed ?? false).length;
  }

  /// Get count of active filters
  int get _activeFilterCount {
    if (_activeFilters == null) return 0;

    int count = 0;
    if (_activeFilters!.priorityIds?.isNotEmpty ?? false) count++;
    if (_activeFilters!.channelIds?.isNotEmpty ?? false) count++;
    if (_activeFilters!.recipientIds?.isNotEmpty ?? false) count++;
    if (_activeFilters!.moduleIds?.isNotEmpty ?? false) count++;
    if (_activeFilters!.subModuleIds?.isNotEmpty ?? false) count++;
    if (_activeFilters!.startDate != null) count++;
    if (_activeFilters!.endDate != null) count++;

    return count;
  }

  @override
  Widget build(BuildContext context) {
    _notificationsProvider = Provider.of<NotificationsProvider>(context);
    _userProvider = Provider.of<UserProvider>(context);

    return Scaffold(
      backgroundColor: AppColor.scaffold2Background(context),
      appBar: DefaultAppBar(
        title: context.translation.notifications,
        actions: [
          // Mark All As Read Button
          TextButton.icon(
            onPressed: () async {
              // Show loading dialog
              showDialog(
                context: context,
                barrierDismissible: false,
                builder: (context) => const Center(
                  child: CircularProgressIndicator(),
                ),
              );

              // Call mark all as read API
              final result = await _notificationsProvider.markAllAsRead(
                userId: _userProvider.user!.userID!,
              );

              // Close loading dialog
              if (context.mounted) {
                Navigator.of(context).pop();
              }

              // Show API response message only if provided
              if (context.mounted && result['message'] != null) {
                result['message'].addTranslation.showToast;
              }
            },
            icon: 'Icon_mark_read'.toSvgAsset(width: 12, height: 12),
            label: Text(
              'Mark All as Read',
              style: AppTextStyles.bodyText2.copyWith(
                color: AppColor.primary10,
                fontWeight: FontWeight.w500,
              ),
            ),
            style: TextButton.styleFrom(
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
              foregroundColor: AppColor.primary10,
            ),
          ),
        ],
      ),
      body: SafeArea(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.end,
          children: [
            // Search Section
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                8.height,
                AppTextFormField(
                  controller: _searchController,
                  labelText: context.translation.search,
                  showShadow: false,
                  showBorder: true,
                  prefixIconData: Icons.search,
                  hintText: 'Search by Title or content'.addTranslation,
                  hintStyle: AppTextStyles.tinyFont.copyWith(color: AppColor.labelTextStyleColor(context)),
                  contentPadding: const EdgeInsets.symmetric(vertical: 14, horizontal: 16),
                  onChange: (value) {
                    _onSearchChanged(value);
                  },
                ),
              ],
            ),

            16.height,

            // Filter Section (Placeholder for future filter/sort buttons)
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 16),
              child: Row(
                children: [
                  // TODO: Add Filter and Sort buttons here when needed
                  const Spacer(),
                ],
              ),
            ),

            // Notification Tabs
            Row(
              children: [
                Expanded(
                  child: SizedBox(
                    height: 35.toScreenHeight,
                    child: ListView.separated(
                      scrollDirection: Axis.horizontal,
                      itemCount: 3,
                      separatorBuilder: (context, index) => 8.width,
                      itemBuilder: (context, index) {
                        final labels = ['All Notifications', 'Read', 'Unread'];
                        final counts = [_allCount, _readCount, _unreadCount];
                        return NotificationTabButton(
                          label: labels[index],
                          count: counts[index],
                          isSelected: _selectedTabIndex == index,
                          onTap: () {
                            setState(() {
                              _selectedTabIndex = index;
                            });
                            // Reload notifications with new tab filter
                            _loadNotifications();
                          },
                        );
                      },
                    ),
                  ),
                ),
                8.width,
                // Sort & Filter Container
                Container(
                  height: 35.toScreenHeight,
                  padding: const EdgeInsets.symmetric(horizontal: 8),
                  decoration: BoxDecoration(
                    color: AppColor.background(context),
                    borderRadius: BorderRadius.circular(6),
                    border: Border.all(color: AppColor.borderColor(context)),
                  ),
                  child: Row(
                    children: [
                      // Sort Icon
                      Transform.flip(
                        flipY: isAscending,
                        child: 'dashboard/sort_descending'
                            .toSvgAsset(
                          width: 20,
                          height: 20,
                          color: AppColor.iconColor(context),
                        )
                            .onPress(() {
                          _toggleSort();
                        }),
                      ),
                      14.width,
                      // Filter Icon
                      Stack(
                        clipBehavior: Clip.none,
                        children: [
                          'filter'
                              .toSvgAsset(
                            width: 20,
                            height: 20,
                            color: AppColor.iconColor(context),
                          )
                              .onPress(() async {
                            // Open filter page
                            final result = await Navigator.push<NotificationFilterModel>(
                              context,
                              MaterialPageRoute(
                                builder: (context) => NotificationFilterPage(data: _activeFilters),
                              ),
                            );

                            if (result != null) {
                              setState(() {
                                _activeFilters = result;
                              });
                              _loadNotifications();
                            }
                          }),
                          // Active Filters Badge
                          if (_activeFilterCount > 0)
                            Positioned(
                              right: -8,
                              top: -8,
                              child: Container(
                                padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 2),
                                decoration: BoxDecoration(
                                  color: AppColor.red30,
                                  borderRadius: BorderRadius.circular(10),
                                  border: Border.all(color: AppColor.white10, width: 1.5),
                                ),
                                constraints: const BoxConstraints(
                                  minWidth: 16,
                                  minHeight: 16,
                                ),
                                child: Text(
                                  '$_activeFilterCount',
                                  textAlign: TextAlign.center,
                                  style: AppTextStyles.tinyFont2.copyWith(
                                    color: AppColor.white10,
                                    fontWeight: FontWeight.w600,
                                    fontSize: 9,
                                  ),
                                ),
                              ),
                            ),
                        ],
                      ),
                    ],
                  ),
                ),
              ],
            ),

            16.height,

            // Notifications List
            Expanded(
              child: LoadingManager(
                isLoading: (_notificationsProvider.isLoading) && _notificationsProvider.notifications.isEmpty,
                isFailedLoading: false, // Don't show error state, show no data found instead
                stateCode: _notificationsProvider.stateCode,
                onRefresh: () async {
                  _notificationsProvider.reset();
                  await _notificationsProvider.getSystemNotifications(
                    user: _userProvider.user!,
                    resetProvider: true,
                    filters: _activeFilters,
                  );
                },
                child: NotificationsList(
                  nextPage: _notificationsProvider.nextPage,
                  onLazyLoad: () async {
                    await _notificationsProvider.getSystemNotifications(
                      user: _userProvider.user!,
                      filters: _activeFilters,
                    );
                  },
                  notifications: _filteredNotifications,
                ),
              ),
            ),
          ],
        ).paddingOnly(start: 16, end: 16),
      ),
    );
  }
}