// Version: 1.7.0 | Created: 2026-04-01 | Updated: 2026-07-04
// Main rooms list screen with bottom navigation.

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

import 'dart:async';

import '../../../app/theme.dart';
import '../../../core/network/matrix_client.dart';
import '../../help/presentation/help_tab.dart';
import '../../panic/presentation/panic_button.dart';
import '../../jitsi/presentation/conference_tab.dart';
import '../../profile/presentation/key_restore_prompt.dart';
import '../../profile/presentation/profile_screen.dart';
import '../../spaces/presentation/spaces_screen.dart';
import 'public_rooms_dialog.dart';
import 'room_tile.dart';
import 'rooms_controller.dart';
import 'user_search_dialog.dart';

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

  @override
  ConsumerState<RoomsScreen> createState() => _RoomsScreenState();
}

class _RoomsScreenState extends ConsumerState<RoomsScreen> {
  int _selectedIndex = 0;
  bool _searchActive = false;
  String _searchQuery = '';
  final _searchController = TextEditingController();

  @override
  void initState() {
    super.initState();
    // Offer encrypted-history restore right after login (fires once).
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (!mounted) return;
      final client = ref.read(matrixClientProvider);
      unawaited(maybePromptKeyRestore(context, client));
    });
  }

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

  void _toggleSearch() {
    setState(() {
      _searchActive = !_searchActive;
      if (!_searchActive) {
        _searchQuery = '';
        _searchController.clear();
      }
    });
  }

  static const _destinations = [
    NavigationDestination(
      icon: Icon(Icons.chat_bubble_outline),
      selectedIcon: Icon(Icons.chat_bubble),
      label: 'Rooms',
    ),
    NavigationDestination(
      icon: Icon(Icons.dashboard_outlined),
      selectedIcon: Icon(Icons.dashboard),
      label: 'Spaces',
    ),
    NavigationDestination(
      icon: Icon(Icons.person_outline),
      selectedIcon: Icon(Icons.person),
      label: 'Profile',
    ),
    NavigationDestination(
      icon: Icon(Icons.videocam_outlined),
      selectedIcon: Icon(Icons.videocam),
      label: 'Conference',
    ),
    NavigationDestination(
      icon: Icon(Icons.help_outline),
      selectedIcon: Icon(Icons.help),
      label: 'Help',
    ),
  ];

  Widget _buildBody() {
    return switch (_selectedIndex) {
      0 => _RoomListBody(searchQuery: _searchQuery),
      1 => const SpacesScreen(embedded: true),
      2 => const ProfileScreen(embedded: true),
      3 => const ConferenceTab(),
      4 => const HelpTab(),
      _ => const _RoomListBody(),
    };
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: _selectedIndex == 0
          ? AppBar(
              title: _searchActive
                  ? TextField(
                      controller: _searchController,
                      autofocus: true,
                      decoration: const InputDecoration(
                        hintText: 'Search rooms...',
                        border: InputBorder.none,
                      ),
                      onChanged: (v) => setState(() => _searchQuery = v),
                    )
                  : const Text('M8Chat'),
              actions: [
                const PanicButton(),
                IconButton(
                  icon: Icon(_searchActive ? Icons.close : Icons.search),
                  tooltip: _searchActive ? 'Cancel search' : 'Search rooms',
                  onPressed: _toggleSearch,
                ),
                if (!_searchActive)
                  IconButton(
                    icon: const Icon(Icons.explore_outlined),
                    tooltip: 'Find rooms',
                    onPressed: () => showPublicRoomsDialog(context),
                  ),
              ],
            )
          : null,
      body: _buildBody(),
      floatingActionButton: _selectedIndex == 0 && !_searchActive
          ? FloatingActionButton.extended(
              onPressed: () => showUserSearchDialog(context),
              tooltip: 'New message',
              icon: const Icon(Icons.edit_square),
              label: const Text('New message'),
            )
          : null,
      bottomNavigationBar: NavigationBar(
        selectedIndex: _selectedIndex,
        onDestinationSelected: (index) =>
            setState(() => _selectedIndex = index),
        destinations: _destinations,
      ),
    );
  }
}

class _RoomListBody extends ConsumerWidget {
  const _RoomListBody({this.searchQuery = ''});

  final String searchQuery;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final roomsAsync = ref.watch(roomsListProvider);

    return roomsAsync.when(
      loading: () => const Center(child: CircularProgressIndicator()),
      error: (error, _) => Center(
        child: Padding(
          padding: const EdgeInsets.all(24),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Icon(Icons.error_outline, size: 48),
              const SizedBox(height: 16),
              Text(
                'Could not load rooms.',
                style: Theme.of(context).textTheme.titleMedium,
              ),
              const SizedBox(height: 8),
              Text(
                error.toString(),
                textAlign: TextAlign.center,
                style: Theme.of(context).textTheme.bodySmall,
              ),
              const SizedBox(height: 24),
              ElevatedButton(
                onPressed: () => ref.refresh(roomsListProvider),
                child: const Text('Retry'),
              ),
            ],
          ),
        ),
      ),
      data: (rooms) {
        final filtered = searchQuery.trim().isEmpty
            ? rooms
            : rooms
                .where((r) => r.displayName
                    .toLowerCase()
                    .contains(searchQuery.trim().toLowerCase()))
                .toList();

        if (filtered.isEmpty) {
          return searchQuery.isNotEmpty
              ? Center(
                  child: Padding(
                    padding: const EdgeInsets.all(32),
                    child: Text(
                      'No rooms match "$searchQuery".',
                      textAlign: TextAlign.center,
                      style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                            color: Theme.of(context)
                                .colorScheme
                                .onSurface
                                .withAlpha(153),
                          ),
                    ),
                  ),
                )
              : const _EmptyRoomsState();
        }

        return ListView.separated(
          itemCount: filtered.length,
          separatorBuilder: (_, __) => const Divider(height: 1, indent: 72),
          itemBuilder: (context, index) {
            final room = filtered[index];
            return RoomTile(
              room: room,
              onTap: () =>
                  context.push('/rooms/${Uri.encodeComponent(room.id)}'),
            );
          },
        );
      },
    );
  }
}

class _EmptyRoomsState extends StatelessWidget {
  const _EmptyRoomsState();

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(32),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              Icons.chat_bubble_outline,
              size: 64,
              color: theme.colorScheme.onSurface.withAlpha(77),
            ),
            const SizedBox(height: 16),
            Text(
              'No rooms yet',
              style: theme.textTheme.titleMedium?.copyWith(
                color: M8Colours.subtleText,
              ),
            ),
            const SizedBox(height: 8),
            Text(
              'Tap the New message button to message someone, or find '
              'a public room to join.',
              textAlign: TextAlign.center,
              style: theme.textTheme.bodySmall?.copyWith(
                color: M8Colours.subtleText,
              ),
            ),
            const SizedBox(height: 20),
            OutlinedButton.icon(
              onPressed: () => showPublicRoomsDialog(context),
              icon: const Icon(Icons.explore_outlined),
              label: const Text('Find rooms'),
            ),
          ],
        ),
      ),
    );
  }
}