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import 'package:flutter/material.dart';
import 'package:agora_rtc_engine/agora_rtc_engine.dart';
import 'package:permission_handler/permission_handler.dart';

const String appId = "YOUR_AGORA_APP_ID";

class CallScreen extends StatefulWidget {
  final String channelName;
  const CallScreen({required this.channelName});

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

class _CallScreenState extends State<CallScreen> {
  late RtcEngine _engine;
  bool _joined = false;
  int? _remoteUid;

  @override
  void initState() {
    super.initState();
    _initAgora();
  }

  Future<void> _initAgora() async {
    await [Permission.microphone].request();

    _engine = createAgoraRtcEngine();
    await _engine.initialize(RtcEngineContext(appId: appId));

    _engine.registerEventHandler(
      RtcEngineEventHandler(
        onJoinChannelSuccess: (connection, elapsed) {
          setState(() => _joined = true);
        },
        onUserJoined: (connection, remoteUid, elapsed) {
          setState(() => _remoteUid = remoteUid);
        },
        onUserOffline: (connection, remoteUid, reason) {
          setState(() => _remoteUid = null);
        },
      ),
    );

    await _engine.joinChannel(
      token: null,
      channelId: widget.channelName,
      uid: 0,
      options: ChannelMediaOptions(),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Call: ${widget.channelName}')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(_joined ? 'In Call' : 'Joining...'),
            SizedBox(height: 20),
            Text(_remoteUid != null ? 'User $_remoteUid connected' : 'Waiting for user...'),
          ],
        ),
      ),
    );
  }

  @override
  void dispose() {
    _engine.leaveChannel();
    _engine.release();
    super.dispose();
  }
}