var name
var connections = new Map()

const configuration = {
  iceServers: [{ urls: 'stun:stun.l.google.com:19302' }]
}

const offerOptions = {
  offerToReceiveAudio: 1,
  offerToReceiveVideo: 1
}

function handleLogin(success) {
  if (success === false) {
    alert('try a different username')
  } else {
    loginDiv.style.display = 'none'
    connectDiv.style.display = 'block'
  }
}

async function createPeerConnection(target) {
  console.log('CREATED PEER CONNECTION')
  var connection = new RTCPeerConnection(configuration)
  connections[target] = connection

  connection.onicecandidate = function(event) {
    if (event.candidate) {
      send({
        type: 'candidate',
        name: name,
        target: target,
        candidate: event.candidate
      })
    }
  }

  connection.onnegotiationneeded = function() { handleNegotiationNeededEvent(target) }
  connection.ontrack = function(event) { handleTrackEvent(event) }
  connection.onsignalingstatechange = function() { handleSignalingStateChangeEvent(connection) }
  connection.oniceconnectionstatechange = function() { handleICEConnectionStateChangeEvent(connection) }
  connection.onicegatheringstatechange = function() { handleICEGatheringStateChangeEvent(connection) }

  // window.setInterval(getConnectionStats, 1000)
}

function handleICEConnectionStateChangeEvent(connection) {
  console.log('ICE CONNECTION CHANGE ' + connection.iceConnectionState)
}

function handleICEGatheringStateChangeEvent(connection) {
  console.log('ICE GATHERING CHANGE ' + connection.iceGatheringState)
}

async function makeOffer(target) {
  createPeerConnection(target)

  var connection = connections[target]

  var offer = await connection.createOffer()
  send({
    type: 'offer',
    name: name,
    target: target,
    offer: offer
  })
  await connection.setLocalDescription(offer)

}

async function handleOffer(offer, target) {
  console.log('GOT OFFER FROM ' + target)
  await createPeerConnection(target)

  var connection = connections[target]

  await connection.setRemoteDescription(new RTCSessionDescription(offer))

  if (stream) {
    console.log('STREAM DETECTED')
    stream.getTracks().forEach((track) => {
      console.log('ADDED TRACK')
      connection.addTrack(track, stream)
    })
  }

  var answer = await connection.createAnswer()

  await connection.setLocalDescription(answer)

  send({
    type: 'answer',
    name: name,
    target: target,
    answer: answer
  })

  for (let user of connections.keys()) {
    console.log(user);
  }

  console.log('CONNECTION SIZE ' + connections.size)

  videoTitle.innerHTML = name + ' | ' + connections.size + ' users connected'
}

async function handleAnswer(answer, target) {
  console.log('GOT ANSWER FROM ' + target)
  var connection = connections[target]
  await connection.setRemoteDescription(new RTCSessionDescription(answer))
}

async function handleCandidate(candidate, target) {
  console.log('GOT CANDIDATE FROM ' + target)
  var connection = connections[target]
  await connection.addIceCandidate(new RTCIceCandidate(candidate))
}

async function handleNegotiationNeededEvent(target) {
  console.log('NEGOTIATION NEEDED FROM ' + target)

  var connection = connections[target]
  var offer = await connection.createOffer(offerOptions)

  await connection.setLocalDescription(offer)

  send({
    type: 'video-offer',
    name: name,
    target: target,
    sdp: connection.localDescription
  })
}

function handleLeave() {
  connections.forEach((connection) => {
    connection.close()
    connection = null
  })
  connections = new Map()

  remoteVideo.pause()
  remoteVideo.src = null
}

async function handleVideoOffer(sdp, target) {
  console.log('GOT VIDEO OFFER FROM ' + target)
  await createPeerConnection(target)
  var connection = connections[target]
  await connection.setRemoteDescription(new RTCSessionDescription(sdp))

  if (stream) {
    console.log('STREAM DETECTED')
    stream.getTracks().forEach((track) => {
      console.log('ADDED TRACK')
      connection.addTrack(track, stream)
    })
  }

  var answer = await connection.createAnswer()
  await connection.setLocalDescription(answer)

  send({
    type: 'video-answer',
    name: name,
    target: target,
    sdp: answer
  })

  //var keys = connections.keys().next().value
  videoTitle.innerHTML = name + ' | connected to ' + target
}

async function handleVideoAnswer(sdp, target) {
  console.log('GOT VIDEO ANSWER FROM ' + target)

  var connection = connections[target]
  await connection.setRemoteDescription(new RTCSessionDescription(sdp))
}

async function handleSignalingStateChangeEvent(connection) {
  console.log('STATE CHANGED TO : ' + connection.signalingState)
  switch(connection.signalingState) {
    case 'closed':
      await connection.close()
      break
  }
}

function handleTrackEvent(event) {
  console.log('GOT TRACK')
  remoteVideo.srcObject = event.streams[0]
  videoDiv.style.display = 'block'
  loadDiv.style.display = 'none'
}

function getConnectionStats() {
  connections.forEach((connection, target) => {
    console.log('[' + target + '] ' + connection.connectionState)
  })
}