const { h } = require('preact')

const uploadStates = {
  'STATE_ERROR': 'error',
  'STATE_WAITING': 'waiting',
  'STATE_PREPROCESSING': 'preprocessing',
  'STATE_UPLOADING': 'uploading',
  'STATE_POSTPROCESSING': 'postprocessing',
  'STATE_COMPLETE': 'complete',
  'STATE_PAUSED': 'paused'
}

function getUploadingState (isAllErrored, isAllComplete, isAllPaused, files = {}) {
  if (isAllErrored) {
    return uploadStates.STATE_ERROR
  }

  if (isAllComplete) {
    return uploadStates.STATE_COMPLETE
  }

  if (isAllPaused) {
    return uploadStates.STATE_PAUSED
  }

  let state = uploadStates.STATE_WAITING
  const fileIDs = Object.keys(files)
  for (let i = 0; i < fileIDs.length; i++) {
    const progress = files[fileIDs[i]].progress
    // If ANY files are being uploaded right now, show the uploading state.
    if (progress.uploadStarted && !progress.uploadComplete) {
      return uploadStates.STATE_UPLOADING
    }
    // If files are being preprocessed AND postprocessed at this time, we show the
    // preprocess state. If any files are being uploaded we show uploading.
    if (progress.preprocess && state !== uploadStates.STATE_UPLOADING) {
      state = uploadStates.STATE_PREPROCESSING
    }
    // If NO files are being preprocessed or uploaded right now, but some files are
    // being postprocessed, show the postprocess state.
    if (progress.postprocess && state !== uploadStates.STATE_UPLOADING && state !== uploadStates.STATE_PREPROCESSING) {
      state = uploadStates.STATE_POSTPROCESSING
    }
  }
  return state
}

function UploadStatus (props) {
  const uploadingState = getUploadingState(
    props.isAllErrored,
    props.isAllComplete,
    props.isAllPaused,
    props.files
  )

  switch (uploadingState) {
    case 'uploading':
      return props.i18n('uploadingXFiles', { smart_count: props.inProgressNotPausedFiles.length })
    case 'preprocessing':
    case 'postprocessing':
      return props.i18n('processingXFiles', { smart_count: props.processingFiles.length })
    case 'paused':
      return props.i18n('uploadPaused')
    case 'waiting':
      return props.i18n('xFilesSelected', { smart_count: props.newFiles.length })
    case 'complete':
      return props.i18n('uploadComplete')
  }
}

function PanelTopBar (props) {
  let allowNewUpload = props.allowNewUpload
  // TODO maybe this should be done in ../index.js, then just pass that down as `allowNewUpload`
  if (allowNewUpload && props.maxNumberOfFiles) {
    allowNewUpload = props.totalFileCount < props.maxNumberOfFiles
  }

  return (
    <div class="uppy-DashboardContent-bar">
      <div>
        {!props.isAllComplete
        ? <button class="uppy-DashboardContent-back"
          type="button"
          onclick={props.cancelAll}>{props.i18n('cancel')}</button>
          : null
        }
      </div>
      <div class="uppy-DashboardContent-title" role="heading" aria-level="h1">
        <UploadStatus {...props} />
      </div>
      { allowNewUpload &&
        <button class="uppy-DashboardContent-addMore"
          type="button"
          aria-label={props.i18n('addMoreFiles')}
          title={props.i18n('addMoreFiles')}
          onclick={() => props.toggleAddFilesPanel(true)}>
          <svg class="UppyIcon" width="14" height="14" viewBox="0 0 14 14">
            <path d="M7.5 6H13a.5.5 0 0 1 .5.5V7a.5.5 0 0 1-.5.5H7.5V13a.5.5 0 0 1-.5.5h-.5A.5.5 0 0 1 6 13V7.5H.5A.5.5 0 0 1 0 7v-.5A.5.5 0 0 1 .5 6H6V.5a.5.5 0 0 1 .5-.5H7a.5.5 0 0 1 .5.5V6z" />
          </svg>
        </button>
      }
    </div>
  )
}

module.exports = PanelTopBar