import React from 'react'
import PropTypes from 'prop-types'

import LayoutDefault from './Layout'
import InputDefault from './Input'
import PreviewDefault from './Preview'
import SubmitButtonDefault from './SubmitButton'
import {
  formatBytes,
  formatDuration,
  accepts,
  resolveValue,
  mergeStyles,
  defaultClassNames,
  getFilesFromEvent as defaultGetFilesFromEvent,
} from './utils'

export type StatusValue =
  | 'rejected_file_type'
  | 'rejected_max_files'
  | 'preparing'
  | 'error_file_size'
  | 'error_validation'
  | 'ready'
  | 'started'
  | 'getting_upload_params'
  | 'error_upload_params'
  | 'uploading'
  | 'exception_upload'
  | 'aborted'
  | 'restarted'
  | 'removed'
  | 'error_upload'
  | 'headers_received'
  | 'done'

export type MethodValue =
  | 'delete'
  | 'get'
  | 'head'
  | 'options'
  | 'patch'
  | 'post'
  | 'put'
  | 'DELETE'
  | 'GET'
  | 'HEAD'
  | 'OPTIONS'
  | 'PATCH'
  | 'POST'
  | 'PUT'

export interface IMeta {
  id: string
  status: StatusValue
  type: string // MIME type, example: `image/*`
  name: string
  uploadedDate: string // ISO string
  percent: number
  size: number // bytes
  lastModifiedDate: string // ISO string
  previewUrl?: string // from URL.createObjectURL
  duration?: number // seconds
  width?: number
  height?: number
  videoWidth?: number
  videoHeight?: number
  validationError?: any
}

export interface IFileWithMeta {
  file: File
  meta: IMeta
  cancel: () => void
  restart: () => void
  remove: () => void
  xhr?: XMLHttpRequest
}

export interface IExtra {
  active: boolean
  reject: boolean
  dragged: DataTransferItem[]
  accept: string
  multiple: boolean
  minSizeBytes: number
  maxSizeBytes: number
  maxFiles: number
}

export interface IUploadParams {
  url: string
  method?: MethodValue
  body?: string | FormData | ArrayBuffer | Blob | File | URLSearchParams
  fields?: { [name: string]: string | Blob }
  headers?: { [name: string]: string }
  meta?: { [name: string]: any }
}

export type CustomizationFunction<T> = (allFiles: IFileWithMeta[], extra: IExtra) => T

export interface IStyleCustomization<T> {
  dropzone?: T | CustomizationFunction<T>
  dropzoneActive?: T | CustomizationFunction<T>
  dropzoneReject?: T | CustomizationFunction<T>
  dropzoneDisabled?: T | CustomizationFunction<T>
  input?: T | CustomizationFunction<T>
  inputLabel?: T | CustomizationFunction<T>
  inputLabelWithFiles?: T | CustomizationFunction<T>
  preview?: T | CustomizationFunction<T>
  previewImage?: T | CustomizationFunction<T>
  submitButtonContainer?: T | CustomizationFunction<T>
  submitButton?: T | CustomizationFunction<T>
}

export interface IExtraLayout extends IExtra {
  onFiles(files: File[]): void
  onCancelFile(file: IFileWithMeta): void
  onRemoveFile(file: IFileWithMeta): void
  onRestartFile(file: IFileWithMeta): void
}

export interface ILayoutProps {
  files: IFileWithMeta[]
  extra: IExtraLayout
  input: React.ReactNode
  previews: React.ReactNode[] | null
  submitButton: React.ReactNode
  dropzoneProps: {
    ref: React.RefObject<HTMLDivElement>
    className: string
    style?: React.CSSProperties
    onDragEnter(event: React.DragEvent<HTMLElement>): void
    onDragOver(event: React.DragEvent<HTMLElement>): void
    onDragLeave(event: React.DragEvent<HTMLElement>): void
    onDrop(event: React.DragEvent<HTMLElement>): void
  }
}

interface ICommonProps {
  files: IFileWithMeta[]
  extra: IExtra
}

export interface IPreviewProps extends ICommonProps {
  meta: IMeta
  className?: string
  imageClassName?: string
  style?: React.CSSProperties
  imageStyle?: React.CSSProperties
  fileWithMeta: IFileWithMeta
  isUpload: boolean
  canCancel: boolean
  canRemove: boolean
  canRestart: boolean
}

export interface IInputProps extends ICommonProps {
  className?: string
  labelClassName?: string
  labelWithFilesClassName?: string
  style?: React.CSSProperties
  labelStyle?: React.CSSProperties
  labelWithFilesStyle?: React.CSSProperties
  getFilesFromEvent: (event: React.ChangeEvent<HTMLInputElement>) => Promise<File[]>
  accept: string
  multiple: boolean
  disabled: boolean
  content?: React.ReactNode
  withFilesContent?: React.ReactNode
  onFiles: (files: File[]) => void
}

export interface ISubmitButtonProps extends ICommonProps {
  className?: string
  buttonClassName?: string
  style?: React.CSSProperties
  buttonStyle?: React.CSSProperties
  disabled: boolean
  content?: React.ReactNode
  onSubmit: (files: IFileWithMeta[]) => void
}

type ReactComponent<Props> = (props: Props) => React.ReactNode | React.Component<Props>

export interface IDropzoneProps {
  onChangeStatus?(
    file: IFileWithMeta,
    status: StatusValue,
    allFiles: IFileWithMeta[],
  ): { meta: { [name: string]: any } } | void
  getUploadParams?(file: IFileWithMeta): IUploadParams | Promise<IUploadParams>
  onSubmit?(successFiles: IFileWithMeta[], allFiles: IFileWithMeta[]): void

  getFilesFromEvent?: (
    event: React.DragEvent<HTMLElement> | React.ChangeEvent<HTMLInputElement>,
  ) => Promise<File[]> | File[]
  getDataTransferItemsFromEvent?: (
    event: React.DragEvent<HTMLElement>,
  ) => Promise<DataTransferItem[]> | DataTransferItem[]

  accept: string
  multiple: boolean
  minSizeBytes: number
  maxSizeBytes: number
  maxFiles: number

  validate?(file: IFileWithMeta): any // usually a string, but can be anything

  autoUpload: boolean
  timeout?: number

  initialFiles?: File[]

  /* component customization */
  disabled: boolean | CustomizationFunction<boolean>

  canCancel: boolean | CustomizationFunction<boolean>
  canRemove: boolean | CustomizationFunction<boolean>
  canRestart: boolean | CustomizationFunction<boolean>

  inputContent: React.ReactNode | CustomizationFunction<React.ReactNode>
  inputWithFilesContent: React.ReactNode | CustomizationFunction<React.ReactNode>

  submitButtonDisabled: boolean | CustomizationFunction<boolean>
  submitButtonContent: React.ReactNode | CustomizationFunction<React.ReactNode>

  classNames: IStyleCustomization<string>
  styles: IStyleCustomization<React.CSSProperties>
  addClassNames: IStyleCustomization<string>

  /* component injection */
  LayoutComponent?: ReactComponent<ILayoutProps>
  PreviewComponent?: ReactComponent<IPreviewProps>
  InputComponent?: ReactComponent<IInputProps>
  SubmitButtonComponent?: ReactComponent<ISubmitButtonProps>
}

class Dropzone extends React.Component<IDropzoneProps, { active: boolean; dragged: (File | DataTransferItem)[] }> {
  static defaultProps: IDropzoneProps
  protected files: IFileWithMeta[]
  protected mounted: boolean
  protected dropzone: React.RefObject<HTMLDivElement>
  protected dragTimeoutId?: number

  constructor(props: IDropzoneProps) {
    super(props)
    this.state = {
      active: false,
      dragged: [],
    }
    this.files = []
    this.mounted = true
    this.dropzone = React.createRef()
  }

  componentDidMount() {
    if (this.props.initialFiles) this.handleFiles(this.props.initialFiles)
  }

  componentDidUpdate(prevProps: IDropzoneProps) {
    const { initialFiles } = this.props
    if (prevProps.initialFiles !== initialFiles && initialFiles) this.handleFiles(initialFiles)
  }

  componentWillUnmount() {
    this.mounted = false
    for (const fileWithMeta of this.files) this.handleCancel(fileWithMeta)
  }

  forceUpdate = () => {
    if (this.mounted) super.forceUpdate()
  }

  getFilesFromEvent = () => {
    return this.props.getFilesFromEvent || defaultGetFilesFromEvent
  }

  getDataTransferItemsFromEvent = () => {
    return this.props.getDataTransferItemsFromEvent || defaultGetFilesFromEvent
  }

  handleDragEnter = async (e: React.DragEvent<HTMLElement>) => {
    e.preventDefault()
    e.stopPropagation()
    const dragged = (await this.getDataTransferItemsFromEvent()(e)) as DataTransferItem[]
    this.setState({ active: true, dragged })
  }

  handleDragOver = async (e: React.DragEvent<HTMLElement>) => {
    e.preventDefault()
    e.stopPropagation()
    clearTimeout(this.dragTimeoutId)
    const dragged = await this.getDataTransferItemsFromEvent()(e)
    this.setState({ active: true, dragged })
  }

  handleDragLeave = (e: React.DragEvent<HTMLElement>) => {
    e.preventDefault()
    e.stopPropagation()
    // prevents repeated toggling of `active` state when file is dragged over children of uploader
    // see: https://www.smashingmagazine.com/2018/01/drag-drop-file-uploader-vanilla-js/
    this.dragTimeoutId = window.setTimeout(() => this.setState({ active: false, dragged: [] }), 150)
  }

  handleDrop = async (e: React.DragEvent<HTMLElement>) => {
    e.preventDefault()
    e.stopPropagation()
    this.setState({ active: false, dragged: [] })
    const files = (await this.getFilesFromEvent()(e)) as File[]
    this.handleFiles(files)
  }

  handleDropDisabled = (e: React.DragEvent<HTMLElement>) => {
    e.preventDefault()
    e.stopPropagation()
    this.setState({ active: false, dragged: [] })
  }

  handleChangeStatus = (fileWithMeta: IFileWithMeta) => {
    if (!this.props.onChangeStatus) return
    const { meta = {} } = this.props.onChangeStatus(fileWithMeta, fileWithMeta.meta.status, this.files) || {}
    if (meta) {
      delete meta.status
      fileWithMeta.meta = { ...fileWithMeta.meta, ...meta }
      this.forceUpdate()
    }
  }

  handleSubmit = (files: IFileWithMeta[]) => {
    if (this.props.onSubmit) this.props.onSubmit(files, [...this.files])
  }

  handleCancel = (fileWithMeta: IFileWithMeta) => {
    if (fileWithMeta.meta.status !== 'uploading') return
    fileWithMeta.meta.status = 'aborted'
    if (fileWithMeta.xhr) fileWithMeta.xhr.abort()
    this.handleChangeStatus(fileWithMeta)
    this.forceUpdate()
  }

  handleRemove = (fileWithMeta: IFileWithMeta) => {
    const index = this.files.findIndex(f => f === fileWithMeta)
    if (index !== -1) {
      URL.revokeObjectURL(fileWithMeta.meta.previewUrl || '')
      fileWithMeta.meta.status = 'removed'
      this.handleChangeStatus(fileWithMeta)
      this.files.splice(index, 1)
      this.forceUpdate()
    }
  }

  handleRestart = (fileWithMeta: IFileWithMeta) => {
    if (!this.props.getUploadParams) return

    if (fileWithMeta.meta.status === 'ready') fileWithMeta.meta.status = 'started'
    else fileWithMeta.meta.status = 'restarted'
    this.handleChangeStatus(fileWithMeta)

    fileWithMeta.meta.status = 'getting_upload_params'
    fileWithMeta.meta.percent = 0
    this.handleChangeStatus(fileWithMeta)
    this.forceUpdate()
    this.uploadFile(fileWithMeta)
  }

  // expects an array of File objects
  handleFiles = (files: File[]) => {
    files.forEach((f, i) => this.handleFile(f, `${new Date().getTime()}-${i}`))
    const { current } = this.dropzone
    if (current) setTimeout(() => current.scroll({ top: current.scrollHeight, behavior: 'smooth' }), 150)
  }

  handleFile = async (file: File, id: string) => {
    const { name, size, type, lastModified } = file
    const { minSizeBytes, maxSizeBytes, maxFiles, accept, getUploadParams, autoUpload, validate } = this.props

    const uploadedDate = new Date().toISOString()
    const lastModifiedDate = lastModified && new Date(lastModified).toISOString()
    const fileWithMeta = {
      file,
      meta: { name, size, type, lastModifiedDate, uploadedDate, percent: 0, id },
    } as IFileWithMeta

    // firefox versions prior to 53 return a bogus mime type for file drag events,
    // so files with that mime type are always accepted
    if (file.type !== 'application/x-moz-file' && !accepts(file, accept)) {
      fileWithMeta.meta.status = 'rejected_file_type'
      this.handleChangeStatus(fileWithMeta)
      return
    }
    if (this.files.length >= maxFiles) {
      fileWithMeta.meta.status = 'rejected_max_files'
      this.handleChangeStatus(fileWithMeta)
      return
    }

    fileWithMeta.cancel = () => this.handleCancel(fileWithMeta)
    fileWithMeta.remove = () => this.handleRemove(fileWithMeta)
    fileWithMeta.restart = () => this.handleRestart(fileWithMeta)

    fileWithMeta.meta.status = 'preparing'
    this.files.push(fileWithMeta)
    this.handleChangeStatus(fileWithMeta)
    this.forceUpdate()

    if (size < minSizeBytes || size > maxSizeBytes) {
      fileWithMeta.meta.status = 'error_file_size'
      this.handleChangeStatus(fileWithMeta)
      this.forceUpdate()
      return
    }

    await this.generatePreview(fileWithMeta)

    if (validate) {
      const error = validate(fileWithMeta)
      if (error) {
        fileWithMeta.meta.status = 'error_validation'
        fileWithMeta.meta.validationError = error // usually a string, but doesn't have to be
        this.handleChangeStatus(fileWithMeta)
        this.forceUpdate()
        return
      }
    }

    if (getUploadParams) {
      if (autoUpload) {
        this.uploadFile(fileWithMeta)
        fileWithMeta.meta.status = 'getting_upload_params'
      } else {
        fileWithMeta.meta.status = 'ready'
      }
    } else {
      fileWithMeta.meta.status = 'done'
    }
    this.handleChangeStatus(fileWithMeta)
    this.forceUpdate()
  }

  generatePreview = async (fileWithMeta: IFileWithMeta) => {
    const {
      meta: { type },
      file,
    } = fileWithMeta
    const isImage = type.startsWith('image/')
    const isAudio = type.startsWith('audio/')
    const isVideo = type.startsWith('video/')
    if (!isImage && !isAudio && !isVideo) return

    const objectUrl = URL.createObjectURL(file)

    const fileCallbackToPromise = (fileObj: HTMLImageElement | HTMLAudioElement) => {
      return Promise.race([
        new Promise(resolve => {
          if (fileObj instanceof HTMLImageElement) fileObj.onload = resolve
          else fileObj.onloadedmetadata = resolve
        }),
        new Promise((_, reject) => {
          setTimeout(reject, 1000)
        }),
      ])
    }

    try {
      if (isImage) {
        const img = new Image()
        img.src = objectUrl
        fileWithMeta.meta.previewUrl = objectUrl
        await fileCallbackToPromise(img)
        fileWithMeta.meta.width = img.width
        fileWithMeta.meta.height = img.height
      }

      if (isAudio) {
        const audio = new Audio()
        audio.src = objectUrl
        await fileCallbackToPromise(audio)
        fileWithMeta.meta.duration = audio.duration
      }

      if (isVideo) {
        const video = document.createElement('video')
        video.src = objectUrl
        await fileCallbackToPromise(video)
        fileWithMeta.meta.duration = video.duration
        fileWithMeta.meta.videoWidth = video.videoWidth
        fileWithMeta.meta.videoHeight = video.videoHeight
      }
      if (!isImage) URL.revokeObjectURL(objectUrl)
    } catch (e) {
      URL.revokeObjectURL(objectUrl)
    }
    this.forceUpdate()
  }

  uploadFile = async (fileWithMeta: IFileWithMeta) => {
    const { getUploadParams } = this.props
    if (!getUploadParams) return
    let params: IUploadParams | null = null
    try {
      params = await getUploadParams(fileWithMeta)
    } catch (e) {
      console.error('Error Upload Params', e.stack)
    }
    if (params === null) return
    const { url, method = 'POST', body, fields = {}, headers = {}, meta: extraMeta = {} } = params
    delete extraMeta.status

    if (!url) {
      fileWithMeta.meta.status = 'error_upload_params'
      this.handleChangeStatus(fileWithMeta)
      this.forceUpdate()
      return
    }

    const xhr = new XMLHttpRequest()
    const formData = new FormData()
    xhr.open(method, url, true)

    for (const field of Object.keys(fields)) formData.append(field, fields[field])
    xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest')
    for (const header of Object.keys(headers)) xhr.setRequestHeader(header, headers[header])
    fileWithMeta.meta = { ...fileWithMeta.meta, ...extraMeta }

    // update progress (can be used to show progress indicator)
    xhr.upload.addEventListener('progress', e => {
      fileWithMeta.meta.percent = (e.loaded * 100.0) / e.total || 100
      this.forceUpdate()
    })

    xhr.addEventListener('readystatechange', () => {
      // https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/readyState
      if (xhr.readyState !== 2 && xhr.readyState !== 4) return

      if (xhr.status === 0 && fileWithMeta.meta.status !== 'aborted') {
        fileWithMeta.meta.status = 'exception_upload'
        this.handleChangeStatus(fileWithMeta)
        this.forceUpdate()
      }

      if (xhr.status > 0 && xhr.status < 400) {
        fileWithMeta.meta.percent = 100
        if (xhr.readyState === 2) fileWithMeta.meta.status = 'headers_received'
        if (xhr.readyState === 4) fileWithMeta.meta.status = 'done'
        this.handleChangeStatus(fileWithMeta)
        this.forceUpdate()
      }

      if (xhr.status >= 400 && fileWithMeta.meta.status !== 'error_upload') {
        fileWithMeta.meta.status = 'error_upload'
        this.handleChangeStatus(fileWithMeta)
        this.forceUpdate()
      }
    })

    formData.append('file', fileWithMeta.file)
    if (this.props.timeout) xhr.timeout = this.props.timeout
    xhr.send(body || formData)
    fileWithMeta.xhr = xhr
    fileWithMeta.meta.status = 'uploading'
    this.handleChangeStatus(fileWithMeta)
    this.forceUpdate()
  }

  render() {
    const {
      accept,
      multiple,
      maxFiles,
      minSizeBytes,
      maxSizeBytes,
      onSubmit,
      getUploadParams,
      disabled,
      canCancel,
      canRemove,
      canRestart,
      inputContent,
      inputWithFilesContent,
      submitButtonDisabled,
      submitButtonContent,
      classNames,
      styles,
      addClassNames,
      InputComponent,
      PreviewComponent,
      SubmitButtonComponent,
      LayoutComponent,
    } = this.props

    const { active, dragged } = this.state

    const reject = dragged.some(file => file.type !== 'application/x-moz-file' && !accepts(file as File, accept))
    const extra = { active, reject, dragged, accept, multiple, minSizeBytes, maxSizeBytes, maxFiles } as IExtra
    const files = [...this.files]
    const dropzoneDisabled = resolveValue(disabled, files, extra)

    const {
      classNames: {
        dropzone: dropzoneClassName,
        dropzoneActive: dropzoneActiveClassName,
        dropzoneReject: dropzoneRejectClassName,
        dropzoneDisabled: dropzoneDisabledClassName,
        input: inputClassName,
        inputLabel: inputLabelClassName,
        inputLabelWithFiles: inputLabelWithFilesClassName,
        preview: previewClassName,
        previewImage: previewImageClassName,
        submitButtonContainer: submitButtonContainerClassName,
        submitButton: submitButtonClassName,
      },
      styles: {
        dropzone: dropzoneStyle,
        dropzoneActive: dropzoneActiveStyle,
        dropzoneReject: dropzoneRejectStyle,
        dropzoneDisabled: dropzoneDisabledStyle,
        input: inputStyle,
        inputLabel: inputLabelStyle,
        inputLabelWithFiles: inputLabelWithFilesStyle,
        preview: previewStyle,
        previewImage: previewImageStyle,
        submitButtonContainer: submitButtonContainerStyle,
        submitButton: submitButtonStyle,
      },
    } = mergeStyles(classNames, styles, addClassNames, files, extra)

    const Input = InputComponent || InputDefault
    const Preview = PreviewComponent || PreviewDefault
    const SubmitButton = SubmitButtonComponent || SubmitButtonDefault
    const Layout = LayoutComponent || LayoutDefault

    let previews = null
    if (PreviewComponent !== null) {
      previews = files.map(f => {
        return (
          //@ts-ignore
          <Preview
            className={previewClassName}
            imageClassName={previewImageClassName}
            style={previewStyle as React.CSSProperties}
            imageStyle={previewImageStyle as React.CSSProperties}
            key={f.meta.id}
            fileWithMeta={f}
            meta={{ ...f.meta }}
            isUpload={Boolean(getUploadParams)}
            canCancel={resolveValue(canCancel, files, extra)}
            canRemove={resolveValue(canRemove, files, extra)}
            canRestart={resolveValue(canRestart, files, extra)}
            files={files}
            extra={extra}
          />
        )
      })
    }

    const input =
      InputComponent !== null ? (
        //@ts-ignore
        <Input
          className={inputClassName}
          labelClassName={inputLabelClassName}
          labelWithFilesClassName={inputLabelWithFilesClassName}
          style={inputStyle as React.CSSProperties}
          labelStyle={inputLabelStyle as React.CSSProperties}
          labelWithFilesStyle={inputLabelWithFilesStyle as React.CSSProperties}
          getFilesFromEvent={this.getFilesFromEvent() as IInputProps['getFilesFromEvent']}
          accept={accept}
          multiple={multiple}
          disabled={dropzoneDisabled}
          content={resolveValue(inputContent, files, extra)}
          withFilesContent={resolveValue(inputWithFilesContent, files, extra)}
          onFiles={this.handleFiles} // see: https://stackoverflow.com/questions/39484895
          files={files}
          extra={extra}
        />
      ) : null

    const submitButton =
      onSubmit && SubmitButtonComponent !== null ? (
        //@ts-ignore
        <SubmitButton
          className={submitButtonContainerClassName}
          buttonClassName={submitButtonClassName}
          style={submitButtonContainerStyle as React.CSSProperties}
          buttonStyle={submitButtonStyle as React.CSSProperties}
          disabled={resolveValue(submitButtonDisabled, files, extra)}
          content={resolveValue(submitButtonContent, files, extra)}
          onSubmit={this.handleSubmit}
          files={files}
          extra={extra}
        />
      ) : null

    let className = dropzoneClassName
    let style = dropzoneStyle

    if (dropzoneDisabled) {
      className = `${className} ${dropzoneDisabledClassName}`
      style = { ...(style || {}), ...(dropzoneDisabledStyle || {}) }
    } else if (reject) {
      className = `${className} ${dropzoneRejectClassName}`
      style = { ...(style || {}), ...(dropzoneRejectStyle || {}) }
    } else if (active) {
      className = `${className} ${dropzoneActiveClassName}`
      style = { ...(style || {}), ...(dropzoneActiveStyle || {}) }
    }

    return (
      //@ts-ignore
      <Layout
        input={input}
        previews={previews}
        submitButton={submitButton}
        dropzoneProps={{
          ref: this.dropzone,
          className,
          style: style as React.CSSProperties,
          onDragEnter: this.handleDragEnter,
          onDragOver: this.handleDragOver,
          onDragLeave: this.handleDragLeave,
          onDrop: dropzoneDisabled ? this.handleDropDisabled : this.handleDrop,
        }}
        files={files}
        extra={
          {
            ...extra,
            onFiles: this.handleFiles,
            onCancelFile: this.handleCancel,
            onRemoveFile: this.handleRemove,
            onRestartFile: this.handleRestart,
          } as IExtraLayout
        }
      />
    )
  }
}

Dropzone.defaultProps = {
  accept: '*',
  multiple: true,
  minSizeBytes: 0,
  maxSizeBytes: Number.MAX_SAFE_INTEGER,
  maxFiles: Number.MAX_SAFE_INTEGER,
  autoUpload: true,
  disabled: false,
  canCancel: true,
  canRemove: true,
  canRestart: true,
  inputContent: 'Drag Files or Click to Browse',
  inputWithFilesContent: 'Add Files',
  submitButtonDisabled: false,
  submitButtonContent: 'Submit',
  classNames: {},
  styles: {},
  addClassNames: {},
}

// @ts-ignore
Dropzone.propTypes = {
  onChangeStatus: PropTypes.func,
  getUploadParams: PropTypes.func,
  onSubmit: PropTypes.func,

  getFilesFromEvent: PropTypes.func,
  getDataTransferItemsFromEvent: PropTypes.func,

  accept: PropTypes.string,
  multiple: PropTypes.bool,
  minSizeBytes: PropTypes.number.isRequired,
  maxSizeBytes: PropTypes.number.isRequired,
  maxFiles: PropTypes.number.isRequired,

  validate: PropTypes.func,

  autoUpload: PropTypes.bool,
  timeout: PropTypes.number,

  initialFiles: PropTypes.arrayOf(PropTypes.any),

  /* component customization */
  disabled: PropTypes.oneOfType([PropTypes.bool, PropTypes.func]),

  canCancel: PropTypes.oneOfType([PropTypes.bool, PropTypes.func]),
  canRemove: PropTypes.oneOfType([PropTypes.bool, PropTypes.func]),
  canRestart: PropTypes.oneOfType([PropTypes.bool, PropTypes.func]),

  inputContent: PropTypes.oneOfType([PropTypes.node, PropTypes.func]),
  inputWithFilesContent: PropTypes.oneOfType([PropTypes.node, PropTypes.func]),

  submitButtonDisabled: PropTypes.oneOfType([PropTypes.bool, PropTypes.func]),
  submitButtonContent: PropTypes.oneOfType([PropTypes.node, PropTypes.func]),

  classNames: PropTypes.object.isRequired,
  styles: PropTypes.object.isRequired,
  addClassNames: PropTypes.object.isRequired,

  /* component injection */
  InputComponent: PropTypes.func,
  PreviewComponent: PropTypes.func,
  SubmitButtonComponent: PropTypes.func,
  LayoutComponent: PropTypes.func,
}

export default Dropzone
export {
  LayoutDefault as Layout,
  InputDefault as Input,
  PreviewDefault as Preview,
  SubmitButtonDefault as SubmitButton,
  formatBytes,
  formatDuration,
  accepts,
  defaultClassNames,
  defaultGetFilesFromEvent as getFilesFromEvent,
}