<div class="display-cover">
    <video autoplay></video>
    <canvas class="d-none"></canvas>

    <div class="video-options">
        <select name="" id="" class="custom-select">
            <option value="">Select camera</option>
        </select>
    </div>

    <img class="screenshot-image d-none" alt="">

    <div class="controls">
        <button class="btn btn-danger play" title="Play"><i data-feather="play-circle"></i></button>
        <button class="btn btn-info pause d-none" title="Pause"><i data-feather="pause"></i></button>
        <button class="btn btn-outline-success screenshot d-none" title="ScreenShot"><i data-feather="image"></i></button>
    </div>
</div>

.screenshot-image {
  width: 150px;
  height: 90px;
  border-radius: 4px;
  border: 2px solid whitesmoke;
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.1);
  position: absolute;
  bottom: 5px;
  left: 10px;
  background: white;
}

.display-cover {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 70%;
  margin: 5% auto;
  position: relative;
}

video {
  //margin: 5% auto;
  width: 100%;
  background: rgba(0,0,0,0.2);
}

.video-options {
  position: absolute;
  left: 20px;
  top: 30px;
}

.controls {
  position: absolute;
  right: 20px;
  top: 20px;
  display: flex;

}

.controls > button {
  width: 45px;
  height: 45px;
  text-align: center;
  border-radius: 100%;
  margin: 0 6px;
  background: transparent;

  &:hover {
    svg {
      color: white !important;
    }
  }
}


@media (min-width: 300px) and (max-width: 400px) {
  .controls {
    flex-direction: column;

    button {
      margin: 5px 0 !important;
    }
  }
}

.controls > button > svg {
  height: 20px;
  width: 18px;
  text-align: center;
  margin: 0 auto;
  padding: 0;
}

.controls button:nth-child(1) {
  border: 2px solid #D2002E;

  svg {
    color: #D2002E;

  }
}

.controls button:nth-child(2) {
  border: 2px solid #008496;

  svg {
    color: #008496;
  }
}

.controls button:nth-child(3) {
  border: 2px solid #00B541;

  svg {
    color: #00B541;
  }
}

.controls > button {
  width: 45px;
  height: 45px;
  text-align: center;
  border-radius: 100%;
  margin: 0 6px;
  background: transparent;

  &:hover {
    svg {
      color: white;
    }
  }
}

feather.replace();

const controls = document.querySelector('.controls');
const cameraOptions = document.querySelector('.video-options>select');
const video = document.querySelector('video');
const canvas = document.querySelector('canvas');
const screenshotImage = document.querySelector('img');
const buttons = [...controls.querySelectorAll('button')];
let streamStarted = false;

const [play, pause, screenshot] = buttons;

const constraints = {
  video: {
    width: {
      min: 1280,
      ideal: 1920,
      max: 2560,
    },
    height: {
      min: 720,
      ideal: 1080,
      max: 1440
    },
  }
};

cameraOptions.onchange = () => {
  const updatedConstraints = {
    ...constraints,
    deviceId: {
      exact: cameraOptions.value
    }
  };

  startStream(updatedConstraints);
};

play.onclick = () => {
  if (streamStarted) {
    video.play();
    play.classList.add('d-none');
    pause.classList.remove('d-none');
    return;
  }
  if ('mediaDevices' in navigator && navigator.mediaDevices.getUserMedia) {
    const updatedConstraints = {
      ...constraints,
      deviceId: {
        exact: cameraOptions.value
      }
    };
    startStream(updatedConstraints);
  }
};

const pauseStream = () => {
  video.pause();
  play.classList.remove('d-none');
  pause.classList.add('d-none');
};

const doScreenshot = () => {
  canvas.width = video.videoWidth;
  canvas.height = video.videoHeight;
  canvas.getContext('2d').drawImage(video, 0, 0);
  screenshotImage.src = canvas.toDataURL('image/webp');
  screenshotImage.classList.remove('d-none');
};

pause.onclick = pauseStream;
screenshot.onclick = doScreenshot;

const startStream = async (constraints) => {
  const stream = await navigator.mediaDevices.getUserMedia(constraints);
  handleStream(stream);
};


const handleStream = (stream) => {
  video.srcObject = stream;
  play.classList.add('d-none');
  pause.classList.remove('d-none');
  screenshot.classList.remove('d-none');

};


const getCameraSelection = async () => {
  const devices = await navigator.mediaDevices.enumerateDevices();
  const videoDevices = devices.filter(device => device.kind === 'videoinput');
  const options = videoDevices.map(videoDevice => {
    return `<option value="${videoDevice.deviceId}">${videoDevice.label}</option>`;
  });
  cameraOptions.innerHTML = options.join('');
};

getCameraSelection();