// http://dropbox.github.io/dropbox-sdk-js/Dropbox.html

// API explorer: https://dropbox.github.io/dropbox-api-v2-explorer/

import { Dropbox } from 'dropbox';

const dbx = new Dropbox({
  accessToken: 'aeOL1E1HS0AAAAAAAAAALX6z1ogWy75HGE_HBN-NNpJNfhnEa1kjF1vsJ_t7Wf8k',
  fetch
})

const fileListElem = document.querySelector('.js-file-list')

const state = {
  files: []
}

const init = async () => {
  const res = await dbx.filesListFolder({
    path: '',
    limit: 20
  })
  updateFiles(res.entries)
}

const updateFiles = files => {
  state.files = [...state.files, ...files]
  renderFiles()
  getThumbnails(files)
}

const renderFiles = () => {
  fileListElem.innerHTML = state.files.sort((a, b) => {
    // sort alphabetically, folders first
    if ((a['.tag'] === 'folder' || b['.tag'] === 'folder')
      && !(a['.tag'] === b['.tag'])) {
      return a['.tag'] === 'folder' ? -1 : 1
    } else {
      return a.name.toLowerCase() < b.name.toLowerCase() ? -1 : 1
    }
  }).map(file => {
    const type = file['.tag']
    let thumbnail
    if (type === 'file') {
      thumbnail = file.thumbnail
      ? `data:image/jpeg;base64, ${file.thumbnail}`
      : `data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0IiBmaWxsPSJub25lIiBzdHJva2U9IiNmZmYiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIiBjbGFzcz0iZmVhdGhlciBmZWF0aGVyLWZpbGUiPjxwYXRoIGQ9Ik0xMyAySDZhMiAyIDAgMCAwLTIgMnYxNmEyIDIgMCAwIDAgMiAyaDEyYTIgMiAwIDAgMCAyLTJWOXoiPjwvcGF0aD48cG9seWxpbmUgcG9pbnRzPSIxMyAyIDEzIDkgMjAgOSI+PC9wb2x5bGluZT48L3N2Zz4=`
    } else {
      thumbnail = `data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0IiBmaWxsPSJub25lIiBzdHJva2U9IiNmZmYiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIiBjbGFzcz0iZmVhdGhlciBmZWF0aGVyLWZvbGRlciI+PHBhdGggZD0iTTIyIDE5YTIgMiAwIDAgMS0yIDJINGEyIDIgMCAwIDEtMi0yVjVhMiAyIDAgMCAxIDItMmg1bDIgM2g5YTIgMiAwIDAgMSAyIDJ6Ij48L3BhdGg+PC9zdmc+`
    }
    return `
      <li class="dbx-list-item ${type}">
        <img class="dbx-thumb" src="${thumbnail}">
        ${file.name}
      </li>
    `
  }).join('')
}

const getThumbnails = async files => {
  const paths = files.filter(file => file['.tag'] === 'file')
  .map(file => ({
    path: file.path_lower,
    size: 'w32h32'
  }))
  const res = await dbx.filesGetThumbnailBatch({
    entries: paths
  })
  const newStateFiles = [...state.files]
  res.entries.forEach(file => {
    let indexToUpdate = state.files.findIndex(
      stateFile => file.metadata.path_lower === stateFile.path_lower
    )
    newStateFiles[indexToUpdate].thumbnail = file.thumbnail
  })
  state.files = newStateFiles
  renderFiles()
}

init()