import { io } from 'socket.io-client';
import Peers from './peers';
import Media from './media';

const internals = {

  kSocketUrl: 'https://junction.tranquil.services',
	kIceServers: [
		{url:"stun:stun.l.google.com:19302"}
	],

  port: null,
  socket: null,
  peers: {},

  onMessage(message) {
    internals[message.action](message.data);
  },

  async joinAudioCall(data) {

    internals.tada = data.tada; // Keeping for fun

    try {
      const mediaStream = await Media.start();

      internals.socket = io(internals.kSocketUrl, {
        transports: ['websocket']
      });

      internals.socket.on('error', function(error) {

        console.error('GENERAL ERROR', error);
      });

      internals.socket.on('connect_error', function(error) {

        console.error('CONNNECT ERROR', error);
      });

      internals.socket.on('connect', function() {

        console.log("Connected to signaling server, group: ", data.currentUrl);
        internals.socket.emit('join', {
          'url': data.currentUrl,
        });
      });

      internals.socket.on('disconnect', function() {

        console.log("disconnected from signaling server");
      });

      internals.socket.on('addPeer', function(data) {

        console.log(data);
        Peers.add(data.peer_id, internals.tada);
          const peerId = data.peer_id;

          const peerConn = new RTCPeerConnection(
              {"iceServers": internals.kIceServers},
              {"optional": [{"DtlsSrtpKeyAgreement": true}]}
          );

          internals.peers[peerId] = peerConn;

          peerConn.onicecandidate = (event) => {
            if (event.candidate) {
              internals.socket.emit('relayICECandidate', {
                'peer_id': peerId,
                'ice_candidate': {
                  'sdpMLineIndex': event.candidate.sdpMLineIndex,
                  'candidate': event.candidate.candidate
                }
              });
            }
          }

          peerConn.onaddstream = (stream) => {
            console.log(`Received stream for peer ${peerId}`);
            console.log(stream);
          }

          peerConn.addStream(mediaStream);

          if (data.should_create_offer) {
            console.log("Creating RTC offer to ", peerId);
            peerConn.createOffer((local_description) => {
                  console.log("Local offer description is: ", local_description);
                  peerConn.setLocalDescription(local_description, () => {
                        internals.socket.emit('relaySessionDescription', {
                          'peer_id': peerId,
                          'session_description': local_description
                        });

                        console.log("Offer setLocalDescription succeeded");
                      }, () => { console.log("Offer setLocalDescription failed!"); }
                  );
                },
                (error) => { console.log("Error sending offer: ", error) }
            );
          }
        console.log(`There are now ${Peers.count()} participants`);
      });

      internals.socket.on('removePeer', function() {

        Peers.remove('id-'+(Peers.count() - 1)); // This is only for testing, don't use count to remove ids.
        console.log(`There are now ${Peers.count()} participants`);
      });
    }
    catch (err) {

      internals.port.postMessage({
        action: 'error'
      });
      internals.port.disconnect();
    }
  },

  hangUp() {

    Peers.reset();
    Media.stop();
    internals.socket.close();
    internals.port.disconnect();
  }
};

internals.port = chrome.runtime.connect({ name:"content" });
internals.port.onMessage.addListener(internals.onMessage);

console.log('Content Script Loaded');

// Indicates to the background script that we executed correctly
true;