/**
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// @license © 2020 Google LLC. Licensed under the Apache License, Version 2.0.

/**
 * Opens a directory from disk using the legacy
 * `<input type="file" webkitdirectory>` method.
 * @type { typeof import("../../index").directoryOpen }
 */
export default async (options = [{}]) => {
  if (!Array.isArray(options)) {
    options = [options]
  }
  options[0].recursive = options[0].recursive || false
  return new Promise((resolve, reject) => {
    const input = document.createElement('input')
    input.type = 'file'
    input.webkitdirectory = true

    const _reject = () => cleanupListenersAndMaybeReject(reject)
    const _resolve = (value) => {
      if (typeof cleanupListenersAndMaybeReject === 'function') {
        cleanupListenersAndMaybeReject()
      }
      resolve(value)
    }
    // ToDo: Remove this workaround once
    // https://github.com/whatwg/html/issues/6376 is specified and supported.
    const cleanupListenersAndMaybeReject =
      options[0].legacySetup && options[0].legacySetup(_resolve, _reject, input)

    input.addEventListener('change', () => {
      let files = Array.from(input.files)
      if (!options[0].recursive) {
        files = files.filter((file) => {
          return file.webkitRelativePath.split('/').length === 2
        })
      } else if (options[0].recursive && options[0].skipDirectory) {
        files = files.filter((file) => {
          const directoriesName = file.webkitRelativePath.split('/')
          return directoriesName.every(
            (directoryName) =>
              !options[0].skipDirectory({
                name: directoryName,
                kind: 'directory',
              })
          )
        })
      }

      _resolve(files)
    })

    input.click()
  })
}