const io = require('socket.io-client')
const mediasoupClient = require('mediasoup-client')
const urlParams = new URLSearchParams(location.search);
const config = require('./config')
console.log('[CONFIG]', config);

const ASSET_ID = parseInt(urlParams.get('assetId')) || null;
const ACCOUNT_ID = parseInt(urlParams.get('accountId')) || null;
const ASSET_NAME = urlParams.get('assetName') || null;
const ASSET_TYPE = urlParams.get('assetType') || null;
let callId = parseInt(urlParams.get('callId')) || null;
const IS_PRODUCER = urlParams.get('producer') === 'true' ? true : false
let remoteVideo = document.getElementById('remoteVideo')
remoteVideo.defaultMuted = true
let produceAudio = false

console.log('[URL] ASSET_ID', ASSET_ID, '| ACCOUNT_ID', ACCOUNT_ID, '| callId', callId, ' | IS_PRODUCER', IS_PRODUCER)

console.log('🟩 config', config)

produceAudioSelector = document.getElementById('produceAudio');
produceAudioSelector.addEventListener('change', e => {
    if(e.target.checked) {
      produceAudio = true
      console.log('produce audio');
    } else {
      produceAudio = false
    }
});

let socket, hub
let device
let rtpCapabilities
let producerTransport
let consumerTransport
let producerVideo
let producerAudio
let consumer
let originAssetId
let consumerVideo // local consumer video(consumer not transport)
let consumerAudio // local consumer audio(consumer not transport)

const remoteSoundControl = document.getElementById('remoteSoundControl');

remoteSoundControl.addEventListener('click', function handleClick() {
  console.log('remoteSoundControl.textContent', remoteSoundControl.textContent);
  if (remoteSoundControl.textContent === 'Unmute') {
    remoteVideo.muted = false
    remoteSoundControl.textContent = 'Mute';
  } else {
    remoteVideo.muted = true
    remoteSoundControl.textContent = 'Unmute';
  }
});

// https://mediasoup.org/documentation/v3/mediasoup-client/api/#ProducerOptions
// https://mediasoup.org/documentation/v3/mediasoup-client/api/#transport-produce
let videoParams = {
  encodings: [
    { scaleResolutionDownBy: 4, maxBitrate: 500000 },
    { scaleResolutionDownBy: 2, maxBitrate: 1000000 },
    { scaleResolutionDownBy: 1, maxBitrate: 5000000 },
    { scalabilityMode: 'S3T3_KEY' }
  ],
  codecOptions: {
    videoGoogleStartBitrate: 1000
  }
}

let audioParams = {
  codecOptions :
  {
    opusStereo : true,
    opusDtx    : true
  }
}

setTimeout(() => {
  hub = io(config.hubAddress)
  
  const connectToMediasoup = () => {
  
    socket = io(config.mediasoupAddress, {
      reconnection: true,
      reconnectionDelay: 1000,
      reconnectionDelayMax : 5000,
      reconnectionAttempts: Infinity
    })
  
    socket.on('connection-success', ({ _socketId, existsProducer }) => {
      console.log(`[MEDIA] ${config.mediasoupAddress} | connected: ${socket.connected} | existsProducer: ${existsProducer}`)
      if (!IS_PRODUCER && existsProducer && consumer === undefined) { 
        goConnect()
      }
      if (IS_PRODUCER && urlParams.get('testing') === 'true') { getLocalStream() }
    })

    socket.on('new-producer', ({ callId }) => {
      console.log(`🟢 new-producer | callId: ${callId} | Ready to consume`);
      consume()
    })
  }
  
  if (IS_PRODUCER === true) {
    hub.on('connect', async () => {
      console.log(`[HUB]! ${config.hubAddress} | connected: ${hub.connected}`)
      connectToMediasoup()
  
      hub.emit(
        'ars',
        JSON.stringify({
          ars: true,
          asset_id: ASSET_ID,
          account_id: ACCOUNT_ID,
        })
      )
    
      hub.on('video', (data) => {
        const parsedData = JSON.parse(data);
  
        if (parsedData.type === 'notify-request') {
        console.log('video', parsedData)
        originAssetId = parsedData.origin_asset_id;
        // originAssetName = parsedData.origin_asset_name;
        // originAssetTypeName = parsedData.origin_asset_type_name;
        callId = parsedData.video_call_id;
    
          console.log('[VIDEO] notify-request | IS_PRODUCER', IS_PRODUCER, 'callId', callId);
          getLocalStream()
        }
  
        if (parsedData.type === 'notify-end') {
          console.log('[VIDEO] notify-end | IS_PRODUCER', IS_PRODUCER, 'callId', callId);
          resetCallSettings()
        }
      })
    })
  
    hub.on('connect_error', (error) => {
      console.log('connect_error', error);
    });
    
    hub.on('connection', () => {
      console.log('connection')
    })
    
    hub.on('disconnect', () => {
      console.log('disconnect')
    })
  } else {
    connectToMediasoup()
  }

}, 1600);

const streamSuccess = (stream) => {
  console.log('[streamSuccess] device', device);
  localVideo.srcObject = stream
  console.log('stream', stream);
  const videoTrack = stream.getVideoTracks()[0]
  const audioTrack = stream.getAudioTracks()[0]

  videoParams = {
    track: videoTrack,
    ...videoParams
  }

  audioParams = {
    track: audioTrack,
    ...audioParams
  }

  console.log('[streamSuccess] videoParams', videoParams, ' | audioParams', audioParams);
  goConnect()
}

const getLocalStream = () => {
  console.log('[getLocalStream]');
  navigator.mediaDevices.getUserMedia({
    audio: produceAudio ? true : false,
    video: {
      qvga : { width: { ideal: 320 }, height: { ideal: 240 } },
      vga  : { width: { ideal: 640 }, height: { ideal: 480 } },
      hd   : { width: { ideal: 1280 }, height: { ideal: 720 } }
    }
  })
  .then(streamSuccess)
  .catch(error => {
    console.log(error.message)
  })

  navigator.permissions.query(
    { name: 'microphone' }
  ).then((permissionStatus) =>{
    console.log('🟨 [PERMISSION] permissionStatus', permissionStatus); // granted, denied, prompt
    // It will block the code from execution and display "Permission denied" if we don't have microphone permissions
  })

}

const goConnect = () => {
  console.log('[goConnect] device:', device);
  device === undefined ? getRtpCapabilities() : goCreateTransport()
}

const goCreateTransport = () => {
  console.log('[goCreateTransport] IS_PRODUCER:', IS_PRODUCER);
  IS_PRODUCER ? createSendTransport() : createRecvTransport()
}

// A device is an endpoint connecting to a Router on the 
// server side to send/recive media
const createDevice = async () => {
  try {
    device = new mediasoupClient.Device()

    // https://mediasoup.org/documentation/v3/mediasoup-client/api/#device-load
    // Loads the device with RTP capabilities of the Router (server side)
    await device.load({
      // see getRtpCapabilities() below
      routerRtpCapabilities: rtpCapabilities
    })

    console.log('Device RTP Capabilities', device.rtpCapabilities)
    console.log('[createDevice] device', device);
    
    // once the device loads, create transport
    goCreateTransport()

  } catch (error) {
    console.log(error)
    if (error.name === 'UnsupportedError')
      console.warn('browser not supported')
  }
}

const getRtpCapabilities = () => {
  console.log('[getRtpCapabilities]');
  // make a request to the server for Router RTP Capabilities
  // see server's socket.on('getRtpCapabilities', ...)
  // the server sends back data object which contains rtpCapabilities
  socket.emit('createRoom', { callId }, (data) => {
    console.log(`Router RTP Capabilities... ${data.rtpCapabilities}`)

    // we assign to local variable and will be used when
    // loading the client Device (see createDevice above)
    rtpCapabilities = data.rtpCapabilities

    // once we have rtpCapabilities from the Router, create Device
    createDevice()
  })
}

const createSendTransport = () => {
  console.log('[createSendTransport');
  // see server's socket.on('createWebRtcTransport', sender?, ...)
  // this is a call from Producer, so sender = true
  socket.emit('createWebRtcTransport', { sender: true }, (value) => {

    console.log(`[createWebRtcTransport] value: ${JSON.stringify(value)}`);

    const params = value.params;
    // The server sends back params needed 
    // to create Send Transport on the client side
    if (params.error) {
      console.log(params.error)
      return
    }
    // creates a new WebRTC Transport to send media
    // based on the server's producer transport params
    // https://mediasoup.org/documentation/v3/mediasoup-client/api/#TransportOptions
    producerTransport = device.createSendTransport(params)

    // https://mediasoup.org/documentation/v3/communication-between-client-and-server/#producing-media
    // this event is raised when a first call to transport.produce() is made
    // see connectSendTransport() below
    producerTransport.on('connect', async ({ dtlsParameters }, callback, errback) => {
      try {
        // Signal local DTLS parameters to the server side transport
        // see server's socket.on('transport-connect', ...)
        await socket.emit('transport-connect', {
          dtlsParameters,
        })

        // Tell the transport that parameters were transmitted.
        callback()

      } catch (error) {
        errback(error)
      }
    })

    producerTransport.on('produce', async (parameters, callback, errback) => {
      console.log('[produce] parameters', parameters)

      try {
        // Tell the server to create a Producer
        // with the following parameters and produce
        // and expect back a server side producer id
        // see server's socket.on('transport-produce', ...)
        await socket.emit('transport-produce', {
          kind: parameters.kind,
          rtpParameters: parameters.rtpParameters,
          appData: parameters.appData,
        }, ({ id }) => {
          // Tell the transport that parameters were transmitted and provide it with the
          // server side producer's id.
          callback({ id })
        })
      } catch (error) {
        errback(error)
      }
    })

    connectSendTransport()
  })
}

const connectSendTransport = async () => {

  console.log('[connectSendTransport] producerTransport');

  // We now call produce() to instruct the producer transport
  // to send media to the Router
  // https://mediasoup.org/documentation/v3/mediasoup-client/api/#transport-produce
  // this action will trigger the 'connect' and 'produce' events above
  
  // Produce video
  let producerVideoHandler = await producerTransport.produce(videoParams)
  console.log('videoParams', videoParams);
  console.log('producerVideo', producerVideo);

  producerVideoHandler.on('trackended', () => {
    console.log('track ended')
    // close video track
  })  

  producerVideoHandler.on('transportclose', () => {
    console.log('transport ended')
    // close video track
  })    
  
  // Produce audio
  if (produceAudio) {
    let producerAudioHandler = await producerTransport.produce(audioParams)
    console.log('audioParams', audioParams);
    console.log('producerAudio', producerAudio);
  
    producerAudioHandler.on('trackended', () => {
      console.log('track ended')
      // close audio track
    })
  
    producerAudioHandler.on('transportclose', () => {
      console.log('transport ended')
      // close audio track
    })
  }

  const answer = {
    origin_asset_id: ASSET_ID,
    dest_asset_id: originAssetId || parseInt(urlParams.get('dest_asset_id')),
    type: 'notify-answer',
    origin_asset_priority: 1,
    origin_asset_type_name: ASSET_TYPE,
    origin_asset_name: ASSET_NAME,
    video_call_id: callId,
    answer: 'accepted', // answer: accepted/rejected
  };
  console.log('SEND answer', answer);

  hub.emit(
    'video',
    JSON.stringify(answer)
  );

  // Enable Close call button
  const closeCallBtn = document.getElementById('btnCloseCall');
  closeCallBtn.removeAttribute('disabled');
}

const createRecvTransport = async () => {
  console.log('createRecvTransport');
  // See server's socket.on('consume', sender?, ...)
  // this is a call from Consumer, so sender = false
  await socket.emit('createWebRtcTransport', { sender: false, callId }, ({ params }) => {
    // The server sends back params needed 
    // to create Send Transport on the client side
    if (params.error) {
      console.log(params.error)
      return
    }

    console.log('[createRecvTransport] params', params)

    // Creates a new WebRTC Transport to receive media
    // based on server's consumer transport params
    // https://mediasoup.org/documentation/v3/mediasoup-client/api/#device-createRecvTransport
    consumerTransport = device.createRecvTransport(params)

    // https://mediasoup.org/documentation/v3/communication-between-client-and-server/#producing-media
    // This event is raised when a first call to transport.produce() is made
    // see connectRecvTransport() below
    consumerTransport.on('connect', async ({ dtlsParameters }, callback, errback) => {
      try {
        // Signal local DTLS parameters to the server side transport
        // see server's socket.on('transport-recv-connect', ...)
        await socket.emit('transport-recv-connect', {
          dtlsParameters,
        })

        // Tell the transport that parameters were transmitted.
        callback()
      } catch (error) {
        // Tell the transport that something was wrong
        errback(error)
      }
    })
    connectRecvTransport()
  })
}

const resetCallSettings = () => {
  localVideo.srcObject = null
  remoteVideo.srcObject = null
  consumer = null
  producerVideo = null
  producerAudio = null
  producerTransport = null
  consumerTransport = null
  device = undefined
}

const connectRecvTransport = async () => {
  console.log('connectRecvTransport');
  // For consumer, we need to tell the server first
  // to create a consumer based on the rtpCapabilities and consume
  // if the router can consume, it will send back a set of params as below
  await socket.emit('consume', {
    rtpCapabilities: device.rtpCapabilities,
    callId
  }, async ({videoParams, audioParams}) => {
    console.log(`[consume] 🟩 videoParams`, videoParams)
    console.log(`[consume] 🟩 audioParams`, audioParams)
    console.log('[consume] 🟩 consumerTransport', consumerTransport)

    let stream = new MediaStream()

    // Maybe the unit does not produce video or audio, so we must only consume what is produced
    if (videoParams) {
      console.log('❗ Have VIDEO stream to consume');
      stream.addTrack(await getVideoTrask(videoParams))
    } else {
      console.log('❗ Don\'t have VIDEO stream to consume');
    }
    
    if (audioParams) {
      console.log('❗ Have AUDIO stream to consume');
      let audioTrack = await getAudioTrask(audioParams)
      stream.addTrack(audioTrack)
    } else {
      console.log('❗ Don\'t have AUDIO stream to consume');
    }

    socket.emit('consumer-resume')

    remoteVideo.srcObject = stream
    remoteVideo.setAttribute('autoplay', true)

    remoteVideo.play()
    .then(() => {
      console.log('remoteVideo PLAY')
    })
    .catch((error) => {
      displayError(`remoteVideo PLAY ERROR | ${error.message}`)
    })
  })
}

const getVideoTrask = async (videoParams) => {
  consumerVideo = await consumerTransport.consume({
    id: videoParams.id,
    producerId: videoParams.producerId,
    kind: videoParams.kind,
    rtpParameters: videoParams.rtpParameters
  }) 

  consumerVideo.on('transportclose', () => {
    console.log('transport closed so consumer closed')
  })

  return consumerVideo.track
}

const getAudioTrask = async (audioParams) => {
  consumerAudio = await consumerTransport.consume({
    id: audioParams.id,
    producerId: audioParams.producerId,
    kind: audioParams.kind,
    rtpParameters: audioParams.rtpParameters
  })

  consumerAudio.on('transportclose', () => {
    console.log('transport closed so consumer closed')
  })

  const audioTrack = consumerAudio.track

  audioTrack.applyConstraints({
    audio: {
      advanced: [
        {
          echoCancellation: {exact: true}
        },
        {
          autoGainControl: {exact: true}
        },
        {
          noiseSuppression: {exact: true}
        }, 
        {
          highpassFilter: {exact: true}
        }
      ]
    }
  })

  return audioTrack
}

const closeCall = () => {
  console.log('closeCall');
  
  // Emit 'notify-end' to Hub so the consumer will know to close the video
  const notifyEnd = {
      origin_asset_id: ASSET_ID,
      dest_asset_id: originAssetId || parseInt(urlParams.get('dest_asset_id')),
      type: 'notify-end', 
    video_call_id: callId
  }
  console.log('notifyEnd', notifyEnd)
  hub.emit('video', JSON.stringify(notifyEnd))

  // Disable Close call button
  const closeCallBtn = document.getElementById('btnCloseCall')
  closeCallBtn.setAttribute('disabled', '')

  // Reset settings
  resetCallSettings()
}

const consume = async () => {
  console.log('[consume]')
  console.log('createRecvTransport Consumer')
  await socket.emit('createWebRtcTransport', { sender: false, callId, dispatcher: true }, ({ params }) => {
    if (params.error) {
      console.log('createRecvTransport | createWebRtcTransport | Error', params.error)
      return
    }
    consumerTransport = device.createRecvTransport(params)
    consumerTransport.on('connect', async ({ dtlsParameters }, callback, errback) => {
      try {
        await socket.emit('transport-recv-connect', {
          dtlsParameters,
        })
        callback()
      } catch (error) {
        errback(error)
      }
    })
    
    connectRecvTransport()
  })
}

btnLocalVideo.addEventListener('click', getLocalStream)
btnRecvSendTransport.addEventListener('click', consume)
btnCloseCall.addEventListener('click', closeCall)