import 'package:flutter/material.dart';
import 'package:healthcare_pharmacy/settings.dart';
import 'dart:async';
import 'package:permission_handler/permission_handler.dart';

import 'package:agora_rtc_engine/rtc_engine.dart';
import 'package:agora_rtc_engine/rtc_engine.dart' as rtc_engine;
import 'package:agora_rtc_engine/rtc_local_view.dart' as rtc_local_view;
import 'package:agora_rtc_engine/rtc_remote_view.dart' as rtc_remote_view;

class CallPage extends StatefulWidget {
  final String? channelName;
  final ClientRole? role;
  const CallPage({Key? key, this.channelName, this.role}) : super(key: key);

  @override
  State<CallPage> createState() => _CallPageState();
}

class _CallPageState extends State<CallPage> {
  final _users = <int>[];
  final _infoString = <String>[];
  late RtcEngine _engine;
  bool muted = false; // Define the muted variable
  bool viewPanel = true;
  @override
  void initState() {
    super.initState();
    initialize();
  }

  @override
  void dispose() {
    _users.clear();
    _engine.leaveChannel();
    _engine.destroy();
    super.dispose();
  }

  Future<void> initialize() async {
    if (appId.isEmpty) {
      setState(() {
        _infoString.add('AppId is missing please provide AppId');
        _infoString.add('Agora Engine is not starting');
      });
      return;
    }
    _engine = await rtc_engine.RtcEngine.create(appId);
    await _engine.enableVideo();
    await _engine.setChannelProfile(ChannelProfile.LiveBroadcasting);
    await _engine.setClientRole(widget.role!);
    _addAgoraEventHandler();
        VideoEncoderConfiguration configuration = VideoEncoderConfiguration(
      dimensions: VideoDimensions(width: 1920, height: 1080),
    );
    await _engine.setVideoEncoderConfiguration(configuration);
    await _engine.joinChannel(token, widget.channelName!, null, 0);
  }

  void _addAgoraEventHandler() {
    _engine.setEventHandler(
      rtc_engine.RtcEngineEventHandler(
        error: (code) {
          setState(() {
            final info = 'Error: $code';
            _infoString.add(info);
          });
        },
        joinChannelSuccess: (channel, uid, elapsed) {
          setState(() {
            final info = 'Join Channel: $channel, uid:$uid';
            _infoString.add(info);
          });
        },
        leaveChannel: (stats) {
          setState(() {
            _infoString.add('Leave Channel');
            _users.clear();
          });
        },
        userJoined: (uid, elapsed) {
          setState(() {
            final info = 'User joined: $uid';
            _infoString.add(info);
            _users.add(uid);
          });
        },
        userOffline: (uid, elapsed) {
          setState(() {
            final info = 'User Offline: $uid';
            _infoString.add(info);
            _users.remove(uid);
          });
        },
        firstRemoteVideoFrame: (uid, width, height, elapsed) {
          setState(() {
            final info = 'First Remote Video: $uid $width*$height';
            _infoString.add(info);
            _users.remove(uid);
          });
        },
      ),
    );
  }





  Widget _viewRows() {
    final List<StatefulWidget> list = [];
    if (widget.role == ClientRole.Broadcaster) {
      list.add(const  rtc_local_view.SurfaceView());
    }
    for (var uid in _users) {
      list.add(rtc_remote_view.SurfaceView(
        uid: uid,
        channelId: widget.channelName!,
      ));
    }
    final views=list;
    return Column(
      children: List.generate(
        views.length,
            (index) => Expanded(
          child: views[index],
        ),
      ),
    );
  }


  Widget _toolbar() {
    if (widget.role == ClientRole.Audience) return SizedBox();

    return Container(
      alignment: Alignment.bottomCenter,
      padding: const EdgeInsets.symmetric(vertical: 48),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          RawMaterialButton(
            onPressed: () {
              setState(() {
                muted = !muted;
              });
              _engine.muteLocalAudioStream(muted);
            },
            child: Icon(
              muted ? Icons.mic_off : Icons.mic,
              color: muted ? Colors.white : Colors.blueAccent,
              size: 20.0,
            ),
            shape: CircleBorder(),
            elevation: 2.0,
            fillColor: muted ? Colors.blueAccent : Colors.white,
            padding: EdgeInsets.all(12.0),
          ),
          RawMaterialButton(
            onPressed: () => Navigator.pop(context),
            child: Icon(
              Icons.call_end,
              color: Colors.white,
              size: 35.0,
            ),
            shape: CircleBorder(),
            elevation: 2.0,
            fillColor: Colors.redAccent,
            padding: EdgeInsets.all(15.0),
          ),
          RawMaterialButton(
            onPressed: () {
              _engine.switchCamera();
            },
            child: Icon(
              Icons.switch_camera,
              color: Colors.blueAccent,
              size: 20.0,
            ),
            shape: CircleBorder(),
            elevation: 2.0,
            fillColor: Colors.white,
            padding: EdgeInsets.all(12.0),
          ),
        ],
      ),
    );
  }


  Widget _panel()
  {
    return Visibility(
      visible: viewPanel,
      child: Container(
        padding: const EdgeInsets.symmetric(vertical: 48),
        alignment: Alignment.bottomCenter,
        child: FractionallySizedBox(
          heightFactor: 0.5,
          child: Container(
            padding: EdgeInsets.symmetric(vertical: 48),
            child: ListView.builder(
              reverse: true,
              itemCount: _infoString.length,
              itemBuilder:(BuildContext context,int index)
                {
                  if(_infoString.isEmpty)
                    {
                      return const Text("null");
                    }
                  return Padding(
                    padding: const EdgeInsets.symmetric(vertical: 3,horizontal: 10),
                    child: Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Flexible(
                          child: Container(
                            padding: const EdgeInsets.symmetric(vertical: 2, horizontal: 5),
                            decoration: BoxDecoration(
                              color: Colors.white,
                              borderRadius: BorderRadius.circular(5)
                            ),
                            child: Text(
                              _infoString[index],
                              style: const TextStyle(color:Colors.blueGrey),
                            ),
                          ),

                        )
                      ],
                    ),
                  );
                },
            ),
          ),
        ),
      ),
    );
  }



  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("VideoCall"),
        centerTitle: true,
        actions: [
          IconButton(onPressed:()
              {
                setState(() {
                  viewPanel=!viewPanel;
                });
              }, icon: const Icon(Icons.ice_skating))
        ],
      ),
      backgroundColor: Colors.black,
      body: Center(
        child: Stack(
          children: <Widget>[
            _viewRows(),
            _panel(),
            _toolbar(),
          ]
        ),
      ),
    );
  }
}