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ivan2282
342
lib/channels_list_screen.dart
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342
lib/channels_list_screen.dart
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import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:gwid/api_service.dart';
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import 'package:gwid/models/channel.dart';
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import 'package:gwid/search_channels_screen.dart';
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class ChannelsListScreen extends StatefulWidget {
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const ChannelsListScreen({super.key});
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@override
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State<ChannelsListScreen> createState() => _ChannelsListScreenState();
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}
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class _ChannelsListScreenState extends State<ChannelsListScreen> {
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final TextEditingController _searchController = TextEditingController();
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StreamSubscription? _apiSubscription;
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bool _isLoading = false;
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List<Channel> _channels = [];
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String? _errorMessage;
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@override
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void initState() {
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super.initState();
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_listenToApiMessages();
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_loadPopularChannels();
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}
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@override
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void dispose() {
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_searchController.dispose();
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_apiSubscription?.cancel();
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super.dispose();
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}
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void _listenToApiMessages() {
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_apiSubscription = ApiService.instance.messages.listen((message) {
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if (!mounted) return;
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if (message['type'] == 'channels_found') {
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setState(() {
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_isLoading = false;
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_errorMessage = null;
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});
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final payload = message['payload'];
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final channelsData = payload['contacts'] as List<dynamic>?;
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if (channelsData != null) {
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_channels = channelsData
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.map((channelJson) => Channel.fromJson(channelJson))
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.toList();
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}
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}
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if (message['type'] == 'channels_not_found') {
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setState(() {
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_isLoading = false;
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_channels.clear();
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});
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final payload = message['payload'];
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String errorMessage = 'Каналы не найдены';
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if (payload != null) {
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if (payload['localizedMessage'] != null) {
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errorMessage = payload['localizedMessage'];
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} else if (payload['message'] != null) {
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errorMessage = payload['message'];
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}
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}
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setState(() {
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_errorMessage = errorMessage;
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});
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}
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});
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}
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void _loadPopularChannels() async {
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setState(() {
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_isLoading = true;
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_errorMessage = null;
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});
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try {
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await ApiService.instance.searchChannels('каналы');
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} catch (e) {
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setState(() {
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_isLoading = false;
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});
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content: Text('Ошибка загрузки каналов: ${e.toString()}'),
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backgroundColor: Theme.of(context).colorScheme.error,
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(12),
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),
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behavior: SnackBarBehavior.floating,
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margin: const EdgeInsets.all(10),
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),
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);
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}
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}
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void _searchChannels() async {
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final searchQuery = _searchController.text.trim();
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if (searchQuery.isEmpty) {
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_loadPopularChannels();
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return;
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}
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setState(() {
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_isLoading = true;
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_errorMessage = null;
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});
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try {
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await ApiService.instance.searchChannels(searchQuery);
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} catch (e) {
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setState(() {
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_isLoading = false;
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});
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content: Text('Ошибка поиска каналов: ${e.toString()}'),
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backgroundColor: Theme.of(context).colorScheme.error,
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shape: RoundedRectangleBorder(
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borderRadius: BorderRadius.circular(12),
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),
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behavior: SnackBarBehavior.floating,
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margin: const EdgeInsets.all(10),
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),
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);
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}
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}
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void _viewChannel(Channel channel) {
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Navigator.of(context).push(
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MaterialPageRoute(
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builder: (context) => ChannelDetailsScreen(channel: channel),
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),
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);
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}
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@override
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Widget build(BuildContext context) {
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final colors = Theme.of(context).colorScheme;
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return Scaffold(
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appBar: AppBar(
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title: const Text('Каналы'),
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backgroundColor: colors.surface,
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foregroundColor: colors.onSurface,
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actions: [
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IconButton(
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icon: const Icon(Icons.search),
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onPressed: () {
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Navigator.of(context).push(
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MaterialPageRoute(
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builder: (context) => const SearchChannelsScreen(),
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),
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);
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},
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),
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],
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),
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body: Column(
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children: [
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Container(
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padding: const EdgeInsets.all(16),
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child: TextField(
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controller: _searchController,
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decoration: InputDecoration(
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hintText: 'Поиск каналов...',
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prefixIcon: const Icon(Icons.search),
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suffixIcon: _searchController.text.isNotEmpty
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? IconButton(
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icon: const Icon(Icons.clear),
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onPressed: () {
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_searchController.clear();
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_loadPopularChannels();
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},
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)
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: null,
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border: OutlineInputBorder(
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borderRadius: BorderRadius.circular(12),
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),
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),
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onSubmitted: (_) => _searchChannels(),
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onChanged: (value) {
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setState(() {});
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},
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),
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),
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Expanded(
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child: _isLoading
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? const Center(child: CircularProgressIndicator())
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: _channels.isEmpty
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? Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(
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Icons.broadcast_on_personal,
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size: 64,
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color: colors.onSurfaceVariant,
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),
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const SizedBox(height: 16),
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Text(
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_errorMessage ?? 'Каналы не найдены',
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style: TextStyle(
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color: colors.onSurfaceVariant,
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fontSize: 16,
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),
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),
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const SizedBox(height: 16),
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ElevatedButton(
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onPressed: _loadPopularChannels,
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child: const Text('Обновить'),
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),
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],
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),
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)
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: ListView.builder(
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padding: const EdgeInsets.symmetric(horizontal: 16),
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itemCount: _channels.length,
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itemBuilder: (context, index) {
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final channel = _channels[index];
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return _buildChannelCard(channel);
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},
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),
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),
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],
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),
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);
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}
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Widget _buildChannelCard(Channel channel) {
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final colors = Theme.of(context).colorScheme;
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return Card(
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margin: const EdgeInsets.only(bottom: 12),
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shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
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child: ListTile(
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contentPadding: const EdgeInsets.all(16),
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leading: CircleAvatar(
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radius: 24,
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backgroundImage: channel.photoBaseUrl != null
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? NetworkImage(channel.photoBaseUrl!)
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: null,
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child: channel.photoBaseUrl == null
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? Text(
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channel.name.isNotEmpty ? channel.name[0].toUpperCase() : '?',
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style: TextStyle(
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color: colors.onSurface,
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fontWeight: FontWeight.w600,
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),
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)
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: null,
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),
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title: Text(
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channel.name,
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style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
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),
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subtitle: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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if (channel.description?.isNotEmpty == true) ...[
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const SizedBox(height: 4),
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Text(
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channel.description!,
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style: TextStyle(color: colors.onSurfaceVariant, fontSize: 14),
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maxLines: 2,
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overflow: TextOverflow.ellipsis,
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),
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],
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const SizedBox(height: 8),
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Wrap(
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spacing: 8,
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runSpacing: 4,
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children: [
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if (channel.options.contains('BOT'))
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Container(
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padding: const EdgeInsets.symmetric(
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horizontal: 8,
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vertical: 2,
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),
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decoration: BoxDecoration(
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color: colors.primaryContainer,
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borderRadius: BorderRadius.circular(12),
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),
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child: Text(
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'Бот',
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style: TextStyle(
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color: colors.onPrimaryContainer,
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fontSize: 12,
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fontWeight: FontWeight.w500,
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),
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),
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),
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if (channel.options.contains('HAS_WEBAPP'))
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Container(
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padding: const EdgeInsets.symmetric(
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horizontal: 8,
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vertical: 2,
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),
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decoration: BoxDecoration(
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color: colors.secondaryContainer,
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borderRadius: BorderRadius.circular(12),
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),
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child: Text(
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'Веб-приложение',
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style: TextStyle(
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color: colors.onSecondaryContainer,
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fontSize: 12,
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fontWeight: FontWeight.w500,
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),
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),
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),
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],
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),
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],
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),
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trailing: Icon(
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Icons.arrow_forward_ios,
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size: 16,
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color: colors.onSurfaceVariant,
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),
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onTap: () => _viewChannel(channel),
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),
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);
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}
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}
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