import 'package:flutter/material.dart';
import 'backend.dart';
import 'chat_screen.dart';

class ChatEntry {
  final int id;
  final String name;

  ChatEntry({required this.id, required this.name});
}

class ChatListScreen extends StatelessWidget {
  const ChatListScreen({super.key});

  static Future<List<ChatEntry>> getChats() async {
    final response = await Backend.sendAction("get-chats", {});
    List<dynamic> chatObjects = response['chats'];
    List<ChatEntry> chats = chatObjects
        .map((msg) => ChatEntry(
              id: msg['id'],
              name: msg['name']?.isNotEmpty == true ? msg['name'] : '[Chat ${msg['id']}]',
            ))
        .toList();
    return chats;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Chats')),
      body: FutureBuilder<List<ChatEntry>>(
        future: getChats(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          } else if (snapshot.hasError) {
            return Center(child: Text('Error: ${snapshot.error}'));
          } else if (!snapshot.hasData || snapshot.data!.isEmpty) {
            return const Center(child: Text('No chats available.'));
          } else {
            final chats = snapshot.data!;
            return ListView.builder(
              itemCount: chats.length,
              itemBuilder: (context, index) {
                final chat = chats[index];
                return ListTile(
                  title: Text(chat.name),
                  onTap: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(
                        builder: (context) => ChatScreen(chatId: chat.id),
                      ),
                    );
                  },
                );
              },
            );
          }
        },
      ),
    );
  }
}