import { ReactNativeFile } from './ReactNativeFile'
export function extractFiles(value, path) {
  if (path === void 0) {
    path = ''
  }

  var clone
  var files = new Map()

  function addFile(paths, file) {
    var storedPaths = files.get(file)
    if (storedPaths) storedPaths.push.apply(storedPaths, paths)
    else files.set(file, paths)
  }

  if (
    (typeof File !== 'undefined' && value instanceof File) ||
    (typeof Blob !== 'undefined' && value instanceof Blob) ||
    value instanceof ReactNativeFile
  ) {
    clone = null
    addFile([path], value)
  } else {
    var prefix = path ? path + '.' : ''
    if (typeof FileList !== 'undefined' && value instanceof FileList)
      clone = Array.prototype.map.call(value, function(file, i) {
        addFile(['' + prefix + i], file)
        return null
      })
    else if (Array.isArray(value))
      clone = value.map(function(child, i) {
        var result = extractFiles(child, '' + prefix + i)
        result.files.forEach(addFile)
        return result.clone
      })
    else if (value && value.constructor === Object) {
      clone = {}

      for (var i in value) {
        var result = extractFiles(value[i], '' + prefix + i)
        result.files.forEach(addFile)
        clone[i] = result.clone
      }
    } else clone = value
  }

  return {
    clone: clone,
    files: files
  }
}