import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:solian/models/channel.dart';
import 'package:solian/providers/auth.dart';
import 'package:solian/router.dart';
import 'package:solian/utils/service_url.dart';
import 'package:solian/widgets/chat/chat_new.dart';
import 'package:solian/widgets/indent_wrapper.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:solian/widgets/notification_notifier.dart';
import 'package:solian/widgets/signin_required.dart';

class ChatIndexScreen extends StatefulWidget {
  const ChatIndexScreen({super.key});

  @override
  State<ChatIndexScreen> createState() => _ChatIndexScreenState();
}

class _ChatIndexScreenState extends State<ChatIndexScreen> {
  List<Channel> _channels = List.empty();

  Future<void> fetchChannels() async {
    final auth = context.read<AuthProvider>();
    if (!await auth.isAuthorized()) return;

    var uri = getRequestUri('messaging', '/api/channels/me/available');

    var res = await auth.client!.get(uri);
    if (res.statusCode == 200) {
      final result = jsonDecode(utf8.decode(res.bodyBytes)) as List<dynamic>;
      setState(() {
        _channels = result.map((x) => Channel.fromJson(x)).toList();
      });
    } else {
      var message = utf8.decode(res.bodyBytes);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text("Something went wrong... $message")),
      );
    }
  }

  void viewNewChatAction() {
    showModalBottomSheet(
      context: context,
      builder: (context) => ChatNewAction(onUpdate: () => fetchChannels()),
    );
  }

  @override
  void initState() {
    Future.delayed(Duration.zero, () {
      fetchChannels();
    });

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    final auth = context.read<AuthProvider>();

    return IndentWrapper(
      title: AppLocalizations.of(context)!.chat,
      appBarActions: const [NotificationButton()],
      floatingActionButton: FutureBuilder(
        future: auth.isAuthorized(),
        builder: (context, snapshot) {
          if (snapshot.hasData && snapshot.data!) {
            return FloatingActionButton.extended(
              icon: const Icon(Icons.add),
              label: Text(AppLocalizations.of(context)!.chatNew),
              onPressed: () => viewNewChatAction(),
            );
          } else {
            return Container();
          }
        },
      ),
      child: FutureBuilder(
          future: auth.isAuthorized(),
          builder: (context, snapshot) {
            if (!snapshot.hasData || !snapshot.data!) {
              return const SignInRequiredScreen();
            }

            return RefreshIndicator(
              onRefresh: () => fetchChannels(),
              child: ListView.builder(
                itemCount: _channels.length,
                itemBuilder: (context, index) {
                  final element = _channels[index];
                  return ListTile(
                    leading: const CircleAvatar(
                      backgroundColor: Colors.indigo,
                      child: Icon(Icons.tag, color: Colors.white),
                    ),
                    title: Text(element.name),
                    subtitle: Text(element.description),
                    onTap: () async {
                      final result = await router.pushNamed(
                        'chat.channel',
                        pathParameters: {
                          'channel': element.alias,
                        },
                      );
                      switch(result) {
                        case 'refresh':
                          fetchChannels();
                      }
                    },
                  );
                },
              ),
            );
          }),
    );
  }
}