/* eslint-disable camelcase */
/* global DataTransfer */
function alpine_webcam_builder ( // eslint-disable-line no-unused-vars
  default_picture,
  delete_url,
  can_delete_picture
) {
  return () => ({
    can_edit_picture: false,

    loading: false,
    is_camera_enabled: false,
    is_camera_error: false,
    picture: null,
    video: null,
    picture_form: null,

    init () {
      this.video = this.$refs.video
      this.picture_form = this.$refs.form.getElementsByTagName('input')
      if (this.picture_form.length > 0) {
        this.picture_form = this.picture_form[0]
        this.can_edit_picture = true

        // Link the displayed element to the form input
        this.picture_form.onchange = (event) => {
          const files = event.srcElement.files
          if (files.length > 0) {
            this.picture = (window.URL || window.webkitURL).createObjectURL(
              event.srcElement.files[0]
            )
          } else {
            this.picture = null
          }
        }
      }
    },

    get_picture () {
      return this.picture || default_picture
    },

    delete_picture () {
      // Only remove currently displayed picture
      if (this.picture) {
        const list = new DataTransfer()
        this.picture_form.files = list.files
        this.picture_form.dispatchEvent(new Event('change'))
        return
      }
      if (!can_delete_picture) {
        return
      }
      // Remove user picture if correct rights are available
      window.open(delete_url, '_self')
    },

    enable_camera () {
      this.picture = null
      this.loading = true
      this.is_camera_error = false
      navigator.mediaDevices
        .getUserMedia({ video: true, audio: false })
        .then((stream) => {
          this.loading = false
          this.is_camera_enabled = true
          this.video.srcObject = stream
          this.video.play()
        })
        .catch((err) => {
          this.is_camera_error = true
          this.loading = false
          throw (err)
        })
    },

    take_picture () {
      const canvas = document.createElement('canvas')
      const context = canvas.getContext('2d')

      /* Create the image */
      const settings = this.video.srcObject.getTracks()[0].getSettings()
      canvas.width = settings.width
      canvas.height = settings.height
      context.drawImage(this.video, 0, 0, canvas.width, canvas.height)

      /* Stop camera */
      this.video.pause()
      this.video.srcObject.getTracks().forEach((track) => {
        if (track.readyState === 'live') {
          track.stop()
        }
      })

      canvas.toBlob((blob) => {
        const filename = interpolate(gettext('captured.%s'), ['webp'])
        const file = new File([blob], filename, {
          type: 'image/webp'
        })

        const list = new DataTransfer()
        list.items.add(file)
        this.picture_form.files = list.files

        // No change event is triggered, we trigger it manually #}
        this.picture_form.dispatchEvent(new Event('change'))
      }, 'image/webp')

      canvas.remove()
      this.is_camera_enabled = false
    }
  })
}