import type {
  Body,
  DefinePluginOpts,
  Meta,
  State,
  UIPluginOptions,
  UnknownPlugin,
  UploadResult,
  Uppy,
  UppyFile,
} from '@uppy/core'
import { UIPlugin } from '@uppy/core'
import { defaultPickerIcon } from '@uppy/core/provider-views'
import type { LocaleStrings } from '@uppy/core/utils'
import { findAllDOMElements, getDroppedFiles, toArray } from '@uppy/core/utils'
import type { ComponentChild, h, VNode } from '@uppy/core/utils/preact'
import ThumbnailGenerator from '@uppy/thumbnail-generator'
import { nanoid } from 'nanoid/non-secure'
import packageJson from '../package.json' with { type: 'json' }
import DashboardUI from './components/Dashboard.js'
import locale from './locale.js'
import createSuperFocus from './utils/createSuperFocus.js'
import * as trapFocus from './utils/trapFocus.js'

type GenericEventCallback = () => void
export type DashboardFileEditStartCallback<M extends Meta, B extends Body> = (
  file?: UppyFile<M, B>,
) => void
export type DashboardFileEditCompleteCallback<
  M extends Meta,
  B extends Body,
> = (file?: UppyFile<M, B>) => void
export type DashboardShowPlanelCallback = (id: string) => void
declare module '@uppy/core' {
  export interface UppyEventMap<M extends Meta, B extends Body> {
    'dashboard:modal-open': GenericEventCallback
    'dashboard:modal-closed': GenericEventCallback
    'dashboard:show-panel': DashboardShowPlanelCallback
    'dashboard:file-edit-start': DashboardFileEditStartCallback<M, B>
    'dashboard:file-edit-complete': DashboardFileEditCompleteCallback<M, B>
    'dashboard:close-panel': (id: string | undefined) => void
  }

  export interface PluginTypeRegistry<M extends Meta, B extends Body> {
    Dashboard: Dashboard<M, B>
  }
}

interface PromiseWithResolvers<T> {
  promise: Promise<T>
  resolve: (value: T | PromiseLike<T>) => void
  reject: (reason?: any) => void
}

const TAB_KEY = 9
const ESC_KEY = 27

function createPromise<T>(): PromiseWithResolvers<T> {
  const o = {} as PromiseWithResolvers<T>
  o.promise = new Promise<T>((resolve, reject) => {
    o.resolve = resolve
    o.reject = reject
  })
  return o
}

type FieldRenderOptions = {
  value: string
  onChange: (newVal: string) => void
  fieldCSSClasses: { text: string }
  required: boolean
  form: string
}

type PreactRender = (
  node: any,
  params: Record<string, unknown> | null,
  ...children: any[]
) => VNode<any>

interface MetaField {
  id: string
  name: string
  placeholder?: string
  render?: (field: FieldRenderOptions, h: PreactRender) => VNode<any>
}

interface Target {
  id: string
  name: string
  type: string
}

export interface TargetWithRender extends Target {
  icon: () => ComponentChild
  render: () => ComponentChild
}

export interface DashboardState<M extends Meta, B extends Body> {
  targets: Target[]
  activePickerPanel: Target | undefined
  showAddFilesPanel: boolean
  activeOverlayType: string | null
  fileCardFor: string | null
  showFileEditor: boolean
  metaFields?: MetaField[] | ((file: UppyFile<M, B>) => MetaField[])
  isHidden: boolean
  isClosing: boolean
  containerWidth: number
  containerHeight: number
  areInsidesReadyToBeVisible: boolean
  isDraggingOver: boolean
  [key: string]: unknown
}

export interface DashboardModalOptions {
  inline?: false
  animateOpenClose?: boolean
  browserBackButtonClose?: boolean
  closeAfterFinish?: boolean
  closeModalOnClickOutside?: boolean
  disablePageScrollWhenModalOpen?: boolean
}

export interface DashboardInlineOptions {
  inline: true

  height?: string | number
  width?: string | number
}

interface DashboardMiscOptions<M extends Meta, B extends Body>
  extends UIPluginOptions {
  autoOpen?: 'metaEditor' | 'imageEditor' | null
  defaultPickerIcon?: typeof defaultPickerIcon
  disabled?: boolean
  disableInformer?: boolean
  disableLocalFiles?: boolean
  disableStatusBar?: boolean
  disableThumbnailGenerator?: boolean
  doneButtonHandler?: null | (() => void)
  fileManagerSelectionType?: 'files' | 'folders' | 'both'
  hideCancelButton?: boolean
  hidePauseResumeButton?: boolean
  hideProgressAfterFinish?: boolean
  hideRetryButton?: boolean
  hideUploadButton?: boolean
  metaFields?: MetaField[] | ((file: UppyFile<M, B>) => MetaField[])
  nativeCameraFacingMode?: 'user' | 'environment' | ''
  note?: string | null
  onDragLeave?: (event: DragEvent) => void
  onDragOver?: (event: DragEvent) => void
  onDrop?: (event: DragEvent) => void
  onRequestCloseModal?: () => void
  plugins?: string[]
  proudlyDisplayPoweredByUppy?: boolean
  showLinkToFileUploadResult?: boolean
  showNativePhotoCameraButton?: boolean
  showNativeVideoCameraButton?: boolean
  hideProgressDetails?: boolean
  showRemoveButtonAfterComplete?: boolean
  showSelectedFiles?: boolean
  singleFileFullScreen?: boolean
  theme?: 'auto' | 'dark' | 'light'
  thumbnailHeight?: number
  thumbnailType?: string
  thumbnailWidth?: number
  trigger?: string | Element | null
  waitForThumbnailsBeforeUpload?: boolean
  locale?: LocaleStrings<typeof locale>
}

export type DashboardOptions<
  M extends Meta,
  B extends Body,
> = DashboardMiscOptions<M, B> &
  (DashboardModalOptions | DashboardInlineOptions)

const defaultOptions = {
  target: 'body',
  metaFields: [],
  thumbnailWidth: 280,
  thumbnailType: 'image/jpeg',
  waitForThumbnailsBeforeUpload: false,
  defaultPickerIcon,
  showLinkToFileUploadResult: false,
  hideProgressDetails: false,
  hideUploadButton: false,
  hideCancelButton: false,
  hideRetryButton: false,
  hidePauseResumeButton: false,
  hideProgressAfterFinish: false,
  note: null,
  singleFileFullScreen: true,
  disableStatusBar: false,
  disableInformer: false,
  disableThumbnailGenerator: false,
  fileManagerSelectionType: 'files',
  proudlyDisplayPoweredByUppy: true,
  showSelectedFiles: true,
  showRemoveButtonAfterComplete: false,
  showNativePhotoCameraButton: false,
  showNativeVideoCameraButton: false,
  theme: 'light',
  autoOpen: null,
  disabled: false,
  disableLocalFiles: false,
  nativeCameraFacingMode: '',
  onDragLeave: () => {},
  onDragOver: () => {},
  onDrop: () => {},
  plugins: [],

  // Dynamic default options, they have to be defined in the constructor (because
  // they require access to the `this` keyword), but we still want them to
  // appear in the default options so TS knows they'll be defined.
  doneButtonHandler: undefined as any,
  onRequestCloseModal: null as any,

  // defaultModalOptions
  inline: false as boolean,
  animateOpenClose: true,
  browserBackButtonClose: false,
  closeAfterFinish: false,
  closeModalOnClickOutside: false,
  disablePageScrollWhenModalOpen: true,
  trigger: null,

  // defaultInlineOptions
  width: 750,
  height: 550,
} satisfies Partial<DashboardOptions<any, any>>

/**
 * Dashboard UI with previews, metadata editing, tabs for various services and more
 */
export default class Dashboard<M extends Meta, B extends Body> extends UIPlugin<
  DefinePluginOpts<
    // The options object inside the class is not the discriminated union but and intersection of the different subtypes.
    DashboardMiscOptions<M, B> &
      Omit<DashboardInlineOptions, 'inline'> &
      Omit<DashboardModalOptions, 'inline'> & { inline?: boolean },
    keyof typeof defaultOptions
  >,
  M,
  B,
  DashboardState<M, B>
> {
  static VERSION = packageJson.version

  #disabledNodes!: HTMLElement[] | null

  private modalName = `uppy-Dashboard-${nanoid()}`

  private superFocus = createSuperFocus()

  private ifFocusedOnUppyRecently = false

  private dashboardIsDisabled!: boolean

  private savedScrollPosition!: number

  private savedActiveElement!: HTMLElement

  private resizeObserver!: ResizeObserver

  private darkModeMediaQuery!: MediaQueryList | null

  // Timeouts
  private makeDashboardInsidesVisibleAnywayTimeout!: ReturnType<
    typeof setTimeout
  >

  constructor(uppy: Uppy<M, B>, opts?: DashboardOptions<M, B>) {
    const autoOpen = opts?.autoOpen ?? null
    super(uppy, { ...defaultOptions, ...opts, autoOpen })
    this.id = this.opts.id || 'Dashboard'
    this.title = 'Dashboard'
    this.type = 'orchestrator'

    this.defaultLocale = locale

    // Dynamic default options:
    if (this.opts.doneButtonHandler === undefined) {
      // `null` means "do not display a Done button", while `undefined` means
      // "I want the default behavior". For this reason, we need to differentiate `null` and `undefined`.
      this.opts.doneButtonHandler = () => {
        this.uppy.clear()
        this.requestCloseModal()
      }
    }
    this.opts.onRequestCloseModal ??= () => this.closeModal()

    this.i18nInit()
  }

  removeTarget = (plugin: UnknownPlugin<M, B>): void => {
    const pluginState = this.getPluginState()
    // filter out the one we want to remove
    const newTargets = pluginState.targets.filter(
      (target) => target.id !== plugin.id,
    )

    this.setPluginState({
      targets: newTargets,
    })
  }

  addTarget = (plugin: UnknownPlugin<M, B>): HTMLElement | null => {
    const callerPluginId = plugin.id || plugin.constructor.name
    const callerPluginName =
      (plugin as any as { title: string }).title || callerPluginId
    const callerPluginType = plugin.type

    if (
      callerPluginType !== 'acquirer' &&
      callerPluginType !== 'progressindicator' &&
      callerPluginType !== 'editor'
    ) {
      const msg =
        'Dashboard: can only be targeted by plugins of types: acquirer, progressindicator, editor'
      this.uppy.log(msg, 'error')
      return null
    }

    const target = {
      id: callerPluginId,
      name: callerPluginName,
      type: callerPluginType,
    }

    const state = this.getPluginState()
    const newTargets = state.targets.slice()
    newTargets.push(target)

    this.setPluginState({
      targets: newTargets,
    })

    return this.el
  }

  hideAllPanels = (): void => {
    const state = this.getPluginState()
    const update = {
      activePickerPanel: undefined,
      showAddFilesPanel: false,
      activeOverlayType: null,
      fileCardFor: null,
      showFileEditor: false,
    }

    if (
      state.activePickerPanel === update.activePickerPanel &&
      state.showAddFilesPanel === update.showAddFilesPanel &&
      state.showFileEditor === update.showFileEditor &&
      state.activeOverlayType === update.activeOverlayType
    ) {
      // avoid doing a state update if nothing changed
      return
    }

    this.setPluginState(update)

    this.uppy.emit('dashboard:close-panel', state.activePickerPanel?.id)
  }

  showPanel = (id: string): void => {
    const { targets } = this.getPluginState()

    const activePickerPanel = targets.find((target) => {
      return target.type === 'acquirer' && target.id === id
    })

    this.setPluginState({
      activePickerPanel,
      activeOverlayType: 'PickerPanel',
    })

    this.uppy.emit('dashboard:show-panel', id)
  }

  private canEditFile = (file: UppyFile<M, B>): boolean => {
    const { targets } = this.getPluginState()
    const editors = this.#getEditors(targets)

    return editors.some((target) =>
      (this.uppy.getPlugin(target.id) as any).canEditFile(file),
    )
  }

  openFileEditor = (file: UppyFile<M, B>): void => {
    const { targets } = this.getPluginState()
    const editors = this.#getEditors(targets)

    this.setPluginState({
      showFileEditor: true,
      fileCardFor: file.id || null,
      activeOverlayType: 'FileEditor',
    })

    editors.forEach((editor) => {
      ;(this.uppy.getPlugin(editor.id) as any).selectFile(file)
    })
  }

  closeFileEditor = (): void => {
    const { metaFields } = this.getPluginState()
    const isMetaEditorEnabled = metaFields && metaFields.length > 0

    if (isMetaEditorEnabled) {
      this.setPluginState({
        showFileEditor: false,
        activeOverlayType: 'FileCard',
      })
    } else {
      this.setPluginState({
        showFileEditor: false,
        fileCardFor: null,
        activeOverlayType: 'AddFiles',
      })
    }
  }

  saveFileEditor = (): void => {
    const { targets } = this.getPluginState()
    const editors = this.#getEditors(targets)

    editors.forEach((editor) => {
      ;(this.uppy.getPlugin(editor.id) as any).save()
    })

    this.closeFileEditor()
  }

  openModal = (): Promise<void> => {
    const { promise, resolve } = createPromise<void>()
    // save scroll position
    this.savedScrollPosition = window.pageYOffset
    // save active element, so we can restore focus when modal is closed
    this.savedActiveElement = document.activeElement as HTMLElement

    if (this.opts.disablePageScrollWhenModalOpen) {
      document.body.classList.add('uppy-Dashboard-isFixed')
    }

    if (this.opts.animateOpenClose && this.getPluginState().isClosing) {
      const handler = () => {
        this.setPluginState({
          isHidden: false,
        })
        this.el!.removeEventListener('animationend', handler, false)
        resolve()
      }
      this.el!.addEventListener('animationend', handler, false)
    } else {
      this.setPluginState({
        isHidden: false,
      })
      resolve()
    }

    if (this.opts.browserBackButtonClose) {
      this.updateBrowserHistory()
    }

    // handle ESC and TAB keys in modal dialog
    document.addEventListener('keydown', this.handleKeyDownInModal)

    this.uppy.emit('dashboard:modal-open')

    return promise
  }

  closeModal = (opts?: { manualClose: boolean }): void | Promise<void> => {
    // Whether the modal is being closed by the user (`true`) or by other means (e.g. browser back button)
    const manualClose = opts?.manualClose ?? true

    const { isHidden, isClosing } = this.getPluginState()
    if (isHidden || isClosing) {
      // short-circuit if animation is ongoing
      return undefined
    }

    const { promise, resolve } = createPromise<void>()

    if (this.opts.disablePageScrollWhenModalOpen) {
      document.body.classList.remove('uppy-Dashboard-isFixed')
    }

    if (this.opts.animateOpenClose) {
      this.setPluginState({
        isClosing: true,
      })
      const handler = () => {
        this.setPluginState({
          isHidden: true,
          isClosing: false,
        })

        this.superFocus.cancel()
        this.savedActiveElement.focus()

        this.el!.removeEventListener('animationend', handler, false)
        resolve()
      }
      this.el!.addEventListener('animationend', handler, false)
    } else {
      this.setPluginState({
        isHidden: true,
      })

      this.superFocus.cancel()
      this.savedActiveElement.focus()

      resolve()
    }

    // handle ESC and TAB keys in modal dialog
    document.removeEventListener('keydown', this.handleKeyDownInModal)

    if (manualClose) {
      if (this.opts.browserBackButtonClose) {
        // Make sure that the latest entry in the history state is our modal name
        if (history.state?.[this.modalName]) {
          // Go back in history to clear out the entry we created (ultimately closing the modal)
          history.back()
        }
      }
    }

    this.uppy.emit('dashboard:modal-closed')

    return promise
  }

  isModalOpen = (): boolean => {
    return !this.getPluginState().isHidden || false
  }

  private requestCloseModal = (): void | Promise<void> => {
    if (this.opts.onRequestCloseModal) {
      return this.opts.onRequestCloseModal()
    }
    return this.closeModal()
  }

  setDarkModeCapability = (isDarkModeOn: boolean): void => {
    const { capabilities } = this.uppy.getState()
    this.uppy.setState({
      capabilities: {
        ...capabilities,
        darkMode: isDarkModeOn,
      },
    })
  }

  private handleSystemDarkModeChange = (event: MediaQueryListEvent) => {
    const isDarkModeOnNow = event.matches
    this.uppy.log(`[Dashboard] Dark mode is ${isDarkModeOnNow ? 'on' : 'off'}`)
    this.setDarkModeCapability(isDarkModeOnNow)
  }

  private toggleFileCard = (show: boolean, fileID: string) => {
    const file = this.uppy.getFile(fileID)
    if (show) {
      this.uppy.emit('dashboard:file-edit-start', file)
    } else {
      this.uppy.emit('dashboard:file-edit-complete', file)
    }

    this.setPluginState({
      fileCardFor: show ? fileID : null,
      activeOverlayType: show ? 'FileCard' : null,
    })
  }

  private toggleAddFilesPanel = (show: boolean) => {
    this.setPluginState({
      showAddFilesPanel: show,
      activeOverlayType: show ? 'AddFiles' : null,
    })
  }

  addFiles = (files: File[]): void => {
    const descriptors = files.map((file) => ({
      source: this.id,
      name: file.name,
      type: file.type,
      data: file,
      meta: {
        // path of the file relative to the ancestor directory the user selected.
        // e.g. 'docs/Old Prague/airbnb.pdf'
        relativePath:
          (file as any).relativePath || file.webkitRelativePath || null,
      } as any as M,
    }))

    try {
      this.uppy.addFiles(descriptors)
    } catch (err) {
      this.uppy.log(err as any)
    }
  }

  // ___Why make insides of Dashboard invisible until first ResizeObserver event is emitted?
  //    ResizeOberserver doesn't emit the first resize event fast enough, users can see the jump from one .uppy-size-- to
  //    another (e.g. in Safari)
  // ___Why not apply visibility property to .uppy-Dashboard-inner?
  //    Because ideally, acc to specs, ResizeObserver should see invisible elements as of width 0. So even though applying
  //    invisibility to .uppy-Dashboard-inner works now, it may not work in the future.
  private startListeningToResize = () => {
    // Watch for Dashboard container (`.uppy-Dashboard-inner`) resize
    // and update containerWidth/containerHeight in plugin state accordingly.
    // Emits first event on initialization.
    this.resizeObserver = new ResizeObserver((entries) => {
      const uppyDashboardInnerEl = entries[0]
      const { width, height } = uppyDashboardInnerEl.contentRect

      this.setPluginState({
        containerWidth: width,
        containerHeight: height,
        areInsidesReadyToBeVisible: true,
      })
    })
    this.resizeObserver.observe(
      this.el!.querySelector('.uppy-Dashboard-inner')!,
    )

    // If ResizeObserver fails to emit an event telling us what size to use - default to the mobile view
    this.makeDashboardInsidesVisibleAnywayTimeout = setTimeout(() => {
      const pluginState = this.getPluginState()
      const isModalAndClosed = !this.opts.inline && pluginState.isHidden
      if (
        // We might want to enable this in the future

        // if ResizeObserver hasn't yet fired,
        !pluginState.areInsidesReadyToBeVisible &&
        // and it's not due to the modal being closed
        !isModalAndClosed
      ) {
        this.uppy.log(
          '[Dashboard] resize event didn’t fire on time: defaulted to mobile layout',
          'warning',
        )

        this.setPluginState({
          areInsidesReadyToBeVisible: true,
        })
      }
    }, 1000)
  }

  private stopListeningToResize = () => {
    this.resizeObserver.disconnect()

    clearTimeout(this.makeDashboardInsidesVisibleAnywayTimeout)
  }

  // Records whether we have been interacting with uppy right now,
  // which is then used to determine whether state updates should trigger a refocusing.
  private recordIfFocusedOnUppyRecently = (event: Event) => {
    if (this.el!.contains(event.target as HTMLElement)) {
      this.ifFocusedOnUppyRecently = true
    } else {
      this.ifFocusedOnUppyRecently = false
      // ___Why run this.superFocus.cancel here when it already runs in superFocusOnEachUpdate?
      //    Because superFocus is debounced, when we move from Uppy to some other element on the page,
      //    previously run superFocus sometimes hits and moves focus back to Uppy.
      this.superFocus.cancel()
    }
  }

  private disableInteractiveElements = (disable: boolean) => {
    const NODES_TO_DISABLE = [
      'a[href]',
      'input:not([disabled])',
      'select:not([disabled])',
      'textarea:not([disabled])',
      'button:not([disabled])',
      '[role="button"]:not([disabled])',
    ]

    const nodesToDisable =
      this.#disabledNodes ??
      toArray(this.el!.querySelectorAll(NODES_TO_DISABLE as any)).filter(
        (node) => !node.classList.contains('uppy-Dashboard-close'),
      )

    for (const node of nodesToDisable) {
      // Links can’t have `disabled` attr, so we use `aria-disabled` for a11y
      if (node.tagName === 'A') {
        node.setAttribute('aria-disabled', disable)
      } else {
        node.disabled = disable
      }
    }

    if (disable) {
      this.#disabledNodes = nodesToDisable
    } else {
      this.#disabledNodes = null
    }

    this.dashboardIsDisabled = disable
  }

  private updateBrowserHistory = () => {
    // Ensure history state does not already contain our modal name to avoid double-pushing
    if (!history.state?.[this.modalName]) {
      // Push to history so that the page is not lost on browser back button press
      history.pushState(
        {
          ...history.state,
          [this.modalName]: true,
        },
        '',
      )
    }

    // Listen for back button presses
    window.addEventListener('popstate', this.handlePopState, false)
  }

  private handlePopState = (event: PopStateEvent) => {
    // Close the modal if the history state no longer contains our modal name
    if (this.isModalOpen() && !event.state?.[this.modalName]) {
      this.closeModal({ manualClose: false })
    }

    // When the browser back button is pressed and uppy is now the latest entry
    // in the history but the modal is closed, fix the history by removing the
    // uppy history entry.
    // This occurs when another entry is added into the history state while the
    // modal is open, and then the modal gets manually closed.
    // Solves PR #575 (https://github.com/transloadit/uppy/pull/575)
    if (!this.isModalOpen() && event.state?.[this.modalName]) {
      history.back()
    }
  }

  private handleKeyDownInModal = (event: KeyboardEvent) => {
    // close modal on esc key press
    if (event.keyCode === ESC_KEY) this.requestCloseModal()
    // trap focus on tab key press
    if (event.keyCode === TAB_KEY)
      trapFocus.forModal(
        event,
        this.getPluginState().activeOverlayType,
        this.el,
      )
  }

  private handleClickOutside = () => {
    if (this.opts.closeModalOnClickOutside) this.requestCloseModal()
  }

  private handlePaste = (event: ClipboardEvent) => {
    // Let any acquirer plugin (Url/Webcam/etc.) handle pastes to the root
    this.uppy.iteratePlugins((plugin) => {
      if (plugin.type === 'acquirer') {
        // Every Plugin with .type acquirer can define handleRootPaste(event)
        ;(plugin as any).handleRootPaste?.(event)
      }
    })

    // Add all dropped files
    const files = toArray(event.clipboardData!.files)
    if (files.length > 0) {
      this.uppy.log('[Dashboard] Files pasted')
      this.addFiles(files)
    }
  }

  private handleInputChange = (
    event: h.JSX.TargetedEvent<HTMLInputElement, Event>,
  ) => {
    event.preventDefault()
    const files = toArray(event.currentTarget.files || [])
    if (files.length > 0) {
      this.uppy.log('[Dashboard] Files selected through input')
      this.addFiles(files)
    }
  }

  private handleDragOver = (event: DragEvent) => {
    event.preventDefault()
    event.stopPropagation()

    // Check if some plugin can handle the datatransfer without files —
    // for instance, the Url plugin can import a url
    const canSomePluginHandleRootDrop = () => {
      let somePluginCanHandleRootDrop = true
      this.uppy.iteratePlugins((plugin) => {
        if ((plugin as any).canHandleRootDrop?.(event)) {
          somePluginCanHandleRootDrop = true
        }
      })
      return somePluginCanHandleRootDrop
    }

    // Check if the "type" of the datatransfer object includes files
    const doesEventHaveFiles = () => {
      const { types } = event.dataTransfer!
      return types.some((type) => type === 'Files')
    }

    // Deny drop, if no plugins can handle datatransfer, there are no files,
    // or when opts.disabled is set, or new uploads are not allowed
    const somePluginCanHandleRootDrop = canSomePluginHandleRootDrop()
    const hasFiles = doesEventHaveFiles()
    if (
      (!somePluginCanHandleRootDrop && !hasFiles) ||
      this.opts.disabled ||
      // opts.disableLocalFiles should only be taken into account if no plugins
      // can handle the datatransfer
      (this.opts.disableLocalFiles &&
        (hasFiles || !somePluginCanHandleRootDrop)) ||
      !this.uppy.getState().allowNewUpload
    ) {
      event.dataTransfer!.dropEffect = 'none'
      return
    }

    // Add a small (+) icon on drop
    // (and prevent browsers from interpreting this as files being _moved_ into the
    // browser, https://github.com/transloadit/uppy/issues/1978).
    event.dataTransfer!.dropEffect = 'copy'

    this.setPluginState({ isDraggingOver: true })

    this.opts.onDragOver(event)
  }

  private handleDragLeave = (event: DragEvent) => {
    event.preventDefault()
    event.stopPropagation()

    this.setPluginState({ isDraggingOver: false })

    this.opts.onDragLeave(event)
  }

  private handleDrop = async (event: DragEvent) => {
    event.preventDefault()
    event.stopPropagation()

    this.setPluginState({ isDraggingOver: false })

    // Let any acquirer plugin (Url/Webcam/etc.) handle drops to the root
    this.uppy.iteratePlugins((plugin) => {
      if (plugin.type === 'acquirer') {
        // Every Plugin with .type acquirer can define handleRootDrop(event)
        ;(plugin as any).handleRootDrop?.(event)
      }
    })

    // Add all dropped files
    let executedDropErrorOnce = false
    const logDropError = (error: any) => {
      this.uppy.log(error, 'error')

      // In practice all drop errors are most likely the same,
      // so let's just show one to avoid overwhelming the user
      if (!executedDropErrorOnce) {
        this.uppy.info(error.message, 'error')
        executedDropErrorOnce = true
      }
    }

    this.uppy.log('[Dashboard] Processing dropped files')

    // Add all dropped files
    const files = await getDroppedFiles(event.dataTransfer!, { logDropError })
    if (files.length > 0) {
      this.uppy.log('[Dashboard] Files dropped')
      this.addFiles(files)
    }

    this.opts.onDrop(event)
  }

  private handleRequestThumbnail = (file: UppyFile<M, B>) => {
    if (!this.opts.waitForThumbnailsBeforeUpload) {
      this.uppy.emit('thumbnail:request', file)
    }
  }

  /**
   * We cancel thumbnail requests when a file item component unmounts to avoid
   * clogging up the queue when the user scrolls past many elements.
   */
  private handleCancelThumbnail = (file: UppyFile<M, B>) => {
    if (!this.opts.waitForThumbnailsBeforeUpload) {
      this.uppy.emit('thumbnail:cancel', file)
    }
  }

  private handleKeyDownInInline = (event: KeyboardEvent) => {
    // Trap focus on tab key press.
    if (event.keyCode === TAB_KEY)
      trapFocus.forInline(
        event,
        this.getPluginState().activeOverlayType,
        this.el,
      )
  }

  // ___Why do we listen to the 'paste' event on a document instead of onPaste={props.handlePaste} prop,
  //    or this.el.addEventListener('paste')?
  //    Because (at least) Chrome doesn't handle paste if focus is on some button, e.g. 'My Device'.
  //    => Therefore, the best option is to listen to all 'paste' events, and only react to them when we are focused on our
  //       particular Uppy instance.
  // ___Why do we still need onPaste={props.handlePaste} for the DashboardUi?
  //    Because if we click on the 'Drop files here' caption e.g., `document.activeElement` will be 'body'. Which means our
  //    standard determination of whether we're pasting into our Uppy instance won't work.
  //    => Therefore, we need a traditional onPaste={props.handlePaste} handler too.
  private handlePasteOnBody = (event: ClipboardEvent) => {
    const isFocusInOverlay = this.el!.contains(document.activeElement)
    if (isFocusInOverlay) {
      this.handlePaste(event)
    }
  }

  private handleComplete = ({ failed }: UploadResult<M, B>) => {
    if (this.opts.closeAfterFinish && !failed?.length) {
      // All uploads are done
      this.requestCloseModal()
    }
  }

  #generateLargeThumbnailIfSingleFile = () => {
    if (this.opts.disableThumbnailGenerator) {
      return
    }

    const LARGE_THUMBNAIL = 600
    const files = this.uppy.getFiles()

    if (files.length === 1) {
      const thumbnailGenerator = this.uppy.getPlugin(
        `${this.id}:ThumbnailGenerator`,
      ) as ThumbnailGenerator<M, B> | undefined
      thumbnailGenerator?.setOptions({ thumbnailWidth: LARGE_THUMBNAIL })
      const fileForThumbnail = { ...files[0], preview: undefined }
      thumbnailGenerator?.requestThumbnail(fileForThumbnail).then(() => {
        thumbnailGenerator?.setOptions({
          thumbnailWidth: this.opts.thumbnailWidth,
        })
      })
    }
  }

  #openFileEditorWhenFilesAdded = (files: UppyFile<M, B>[]) => {
    const firstFile = files[0]

    const { metaFields } = this.getPluginState()
    const isMetaEditorEnabled = metaFields && metaFields.length > 0
    const isImageEditorEnabled = this.canEditFile(firstFile)

    if (isMetaEditorEnabled && this.opts.autoOpen === 'metaEditor') {
      this.toggleFileCard(true, firstFile.id)
    } else if (isImageEditorEnabled && this.opts.autoOpen === 'imageEditor') {
      this.openFileEditor(firstFile)
    }
  }

  initEvents = (): void => {
    // Modal open button
    if (this.opts.trigger && !this.opts.inline) {
      const showModalTrigger = findAllDOMElements(this.opts.trigger)
      if (showModalTrigger) {
        showModalTrigger.forEach((trigger) => {
          trigger.addEventListener('click', this.openModal)
        })
      } else {
        this.uppy.log(
          'Dashboard modal trigger not found. Make sure `trigger` is set in Dashboard options, unless you are planning to call `dashboard.openModal()` method yourself',
          'warning',
        )
      }
    }

    this.startListeningToResize()
    document.addEventListener('paste', this.handlePasteOnBody)

    this.uppy.on('plugin-added', this.#addSupportedPluginIfNoTarget)
    this.uppy.on('plugin-remove', this.removeTarget)
    this.uppy.on('file-added', this.hideAllPanels)
    this.uppy.on('dashboard:modal-closed', this.hideAllPanels)
    this.uppy.on('complete', this.handleComplete)

    this.uppy.on('files-added', this.#generateLargeThumbnailIfSingleFile)
    this.uppy.on('file-removed', this.#generateLargeThumbnailIfSingleFile)

    // ___Why fire on capture?
    //    Because this.ifFocusedOnUppyRecently needs to change before onUpdate() fires.
    document.addEventListener('focus', this.recordIfFocusedOnUppyRecently, true)
    document.addEventListener('click', this.recordIfFocusedOnUppyRecently, true)

    if (this.opts.inline) {
      this.el!.addEventListener('keydown', this.handleKeyDownInInline)
    }

    if (this.opts.autoOpen) {
      this.uppy.on('files-added', this.#openFileEditorWhenFilesAdded)
    }
  }

  removeEvents = (): void => {
    const showModalTrigger = findAllDOMElements(this.opts.trigger)
    if (!this.opts.inline && showModalTrigger) {
      showModalTrigger.forEach((trigger) => {
        trigger.removeEventListener('click', this.openModal)
      })
    }

    this.stopListeningToResize()
    document.removeEventListener('paste', this.handlePasteOnBody)
    window.removeEventListener('popstate', this.handlePopState, false)

    this.uppy.off('plugin-added', this.#addSupportedPluginIfNoTarget)
    this.uppy.off('plugin-remove', this.removeTarget)
    this.uppy.off('file-added', this.hideAllPanels)
    this.uppy.off('dashboard:modal-closed', this.hideAllPanels)
    this.uppy.off('complete', this.handleComplete)

    this.uppy.off('files-added', this.#generateLargeThumbnailIfSingleFile)
    this.uppy.off('file-removed', this.#generateLargeThumbnailIfSingleFile)

    document.removeEventListener(
      'focus',
      this.recordIfFocusedOnUppyRecently,
      true,
    )
    document.removeEventListener(
      'click',
      this.recordIfFocusedOnUppyRecently,
      true,
    )

    if (this.opts.inline) {
      this.el!.removeEventListener('keydown', this.handleKeyDownInInline)
    }

    if (this.opts.autoOpen) {
      this.uppy.off('files-added', this.#openFileEditorWhenFilesAdded)
    }
  }

  private superFocusOnEachUpdate = () => {
    const isFocusInUppy = this.el!.contains(document.activeElement)
    // When focus is lost on the page (== focus is on body for most browsers, or focus is null for IE11)
    const isFocusNowhere =
      document.activeElement === document.body ||
      document.activeElement === null
    const isInformerHidden = this.uppy.getState().info.length === 0
    const isModal = !this.opts.inline

    if (
      // If update is connected to showing the Informer - let the screen reader calmly read it.
      isInformerHidden &&
      // If we are in a modal - always superfocus without concern for other elements
      // on the page (user is unlikely to want to interact with the rest of the page)
      (isModal ||
        // If we are already inside of Uppy, or
        isFocusInUppy ||
        // If we are not focused on anything BUT we have already, at least once, focused on uppy
        //   1. We focus when isFocusNowhere, because when the element we were focused
        //      on disappears (e.g. an overlay), - focus gets lost. If user is typing
        //      something somewhere else on the page, - focus won't be 'nowhere'.
        //   2. We only focus when focus is nowhere AND this.ifFocusedOnUppyRecently,
        //      to avoid focus jumps if we do something else on the page.
        //   [Practical check] Without '&& this.ifFocusedOnUppyRecently', in Safari, in inline mode,
        //                     when file is uploading, - navigate via tab to the checkbox,
        //                     try to press space multiple times. Focus will jump to Uppy.
        (isFocusNowhere && this.ifFocusedOnUppyRecently))
    ) {
      this.superFocus(this.el, this.getPluginState().activeOverlayType)
    } else {
      this.superFocus.cancel()
    }
  }

  readonly afterUpdate = (): void => {
    if (this.opts.disabled && !this.dashboardIsDisabled) {
      this.disableInteractiveElements(true)
      return
    }

    if (!this.opts.disabled && this.dashboardIsDisabled) {
      this.disableInteractiveElements(false)
    }

    this.superFocusOnEachUpdate()
  }

  saveFileCard = (meta: M, fileID: string): void => {
    this.uppy.setFileMeta(fileID, meta)
    this.toggleFileCard(false, fileID)
  }

  #attachRenderFunctionToTarget = (target: Target): TargetWithRender => {
    const plugin = this.uppy.getPlugin(target.id) as any
    return {
      ...target,
      icon: plugin.icon || this.opts.defaultPickerIcon,
      render: plugin.render,
    }
  }

  #isTargetSupported = (target: Target) => {
    const plugin = this.uppy.getPlugin(target.id) as any as {
      isSupported?: () => boolean
    }
    // If the plugin does not provide a `supported` check, assume the plugin works everywhere.
    if (typeof plugin.isSupported !== 'function') {
      return true
    }
    return plugin.isSupported()
  }

  #getAcquirers = (targets: Target[]) => {
    return targets
      .filter(
        (target) =>
          target.type === 'acquirer' && this.#isTargetSupported(target),
      )
      .map(this.#attachRenderFunctionToTarget)
  }

  #getProgressIndicators = (targets: Target[]) => {
    return targets
      .filter((target) => target.type === 'progressindicator')
      .map(this.#attachRenderFunctionToTarget)
  }

  #getEditors = (targets: Target[]) => {
    return targets
      .filter((target) => target.type === 'editor')
      .map(this.#attachRenderFunctionToTarget)
  }

  render = (state: State<M, B>) => {
    const pluginState = this.getPluginState()
    const { files, capabilities, allowNewUpload } = state
    const {
      newFiles,
      uploadStartedFiles,
      completeFiles,
      erroredFiles,
      inProgressFiles,
      inProgressNotPausedFiles,
      processingFiles,

      isUploadStarted,
      isAllComplete,
      isAllPaused,
    } = this.uppy.getObjectOfFilesPerState()

    const acquirers = this.#getAcquirers(pluginState.targets)
    const progressindicators = this.#getProgressIndicators(pluginState.targets)
    const editors = this.#getEditors(pluginState.targets)

    let theme: 'auto' | 'dark' | 'light'
    if (this.opts.theme === 'auto') {
      theme = capabilities.darkMode ? 'dark' : 'light'
    } else {
      theme = this.opts.theme
    }

    if (
      ['files', 'folders', 'both'].indexOf(this.opts.fileManagerSelectionType) <
      0
    ) {
      this.opts.fileManagerSelectionType = 'files'
      console.warn(
        `Unsupported option for "fileManagerSelectionType". Using default of "${this.opts.fileManagerSelectionType}".`,
      )
    }

    return DashboardUI({
      state,
      isHidden: pluginState.isHidden,
      files,
      newFiles,
      uploadStartedFiles,
      completeFiles,
      erroredFiles,
      inProgressFiles,
      inProgressNotPausedFiles,
      processingFiles,
      isUploadStarted,
      isAllComplete,
      isAllPaused,
      totalFileCount: Object.keys(files).length,
      totalProgress: state.totalProgress,
      allowNewUpload,
      acquirers,
      theme,
      disabled: this.opts.disabled,
      disableLocalFiles: this.opts.disableLocalFiles,
      direction: this.opts.direction,
      activePickerPanel: pluginState.activePickerPanel,
      showFileEditor: pluginState.showFileEditor,
      saveFileEditor: this.saveFileEditor,
      closeFileEditor: this.closeFileEditor,
      disableInteractiveElements: this.disableInteractiveElements,
      animateOpenClose: this.opts.animateOpenClose,
      isClosing: pluginState.isClosing,
      progressindicators,
      editors,
      autoProceed: this.uppy.opts.autoProceed,
      id: this.id,
      closeModal: this.requestCloseModal,
      handleClickOutside: this.handleClickOutside,
      handleInputChange: this.handleInputChange,
      handlePaste: this.handlePaste,
      inline: this.opts.inline,
      showPanel: this.showPanel,
      hideAllPanels: this.hideAllPanels,
      i18n: this.i18n,
      i18nArray: this.i18nArray,
      uppy: this.uppy,
      note: this.opts.note,
      recoveredState: state.recoveredState,
      metaFields: pluginState.metaFields,
      resumableUploads: capabilities.resumableUploads || false,
      individualCancellation: capabilities.individualCancellation,
      isMobileDevice: capabilities.isMobileDevice,
      fileCardFor: pluginState.fileCardFor,
      toggleFileCard: this.toggleFileCard,
      toggleAddFilesPanel: this.toggleAddFilesPanel,
      showAddFilesPanel: pluginState.showAddFilesPanel,
      saveFileCard: this.saveFileCard,
      openFileEditor: this.openFileEditor,
      canEditFile: this.canEditFile,
      width: this.opts.width,
      height: this.opts.height,
      showLinkToFileUploadResult: this.opts.showLinkToFileUploadResult,
      fileManagerSelectionType: this.opts.fileManagerSelectionType,
      proudlyDisplayPoweredByUppy: this.opts.proudlyDisplayPoweredByUppy,
      showRemoveButtonAfterComplete: this.opts.showRemoveButtonAfterComplete,
      containerWidth: pluginState.containerWidth,
      containerHeight: pluginState.containerHeight,
      areInsidesReadyToBeVisible: pluginState.areInsidesReadyToBeVisible,
      parentElement: this.el,
      allowedFileTypes: this.uppy.opts.restrictions.allowedFileTypes,
      maxNumberOfFiles: this.uppy.opts.restrictions.maxNumberOfFiles,
      requiredMetaFields: this.uppy.opts.restrictions.requiredMetaFields,
      showSelectedFiles: this.opts.showSelectedFiles,
      showNativePhotoCameraButton: this.opts.showNativePhotoCameraButton,
      showNativeVideoCameraButton: this.opts.showNativeVideoCameraButton,
      nativeCameraFacingMode: this.opts.nativeCameraFacingMode,
      singleFileFullScreen: this.opts.singleFileFullScreen,
      handleRequestThumbnail: this.handleRequestThumbnail,
      handleCancelThumbnail: this.handleCancelThumbnail,
      // drag props
      isDraggingOver: pluginState.isDraggingOver,
      handleDragOver: this.handleDragOver,
      handleDragLeave: this.handleDragLeave,
      handleDrop: this.handleDrop,
      // informer props
      disableInformer: this.opts.disableInformer,
      // status-bar props
      disableStatusBar: this.opts.disableStatusBar,
      hideProgressDetails: this.opts.hideProgressDetails,
      hideUploadButton: this.opts.hideUploadButton,
      hideRetryButton: this.opts.hideRetryButton,
      hidePauseResumeButton: this.opts.hidePauseResumeButton,
      hideCancelButton: this.opts.hideCancelButton,
      hideProgressAfterFinish: this.opts.hideProgressAfterFinish,
      doneButtonHandler: this.opts.doneButtonHandler,
    })
  }

  #addSpecifiedPluginsFromOptions = () => {
    const { plugins } = this.opts

    plugins.forEach((pluginID) => {
      const plugin = this.uppy.getPlugin(pluginID)
      if (plugin) {
        ;(plugin as any).mount(this, plugin)
      } else {
        this.uppy.log(
          `[Uppy] Dashboard could not find plugin '${pluginID}', make sure to uppy.use() the plugins you are specifying`,
          'warning',
        )
      }
    })
  }

  #autoDiscoverPlugins = () => {
    this.uppy.iteratePlugins(this.#addSupportedPluginIfNoTarget)
  }

  #addSupportedPluginIfNoTarget = (plugin?: UnknownPlugin<M, B>) => {
    // Only these types belong on the Dashboard,
    // we wouldn’t want to try and mount Compressor or Tus, for example.
    const typesAllowed = ['acquirer', 'editor']
    if (plugin && !plugin.opts?.target && typesAllowed.includes(plugin.type)) {
      const pluginAlreadyAdded = this.getPluginState().targets.some(
        (installedPlugin) => plugin.id === installedPlugin.id,
      )
      if (!pluginAlreadyAdded) {
        ;(plugin as any).mount(this, plugin)
      }
    }
  }

  #getThumbnailGeneratorOpts() {
    const {
      thumbnailWidth,
      thumbnailHeight,
      thumbnailType,
      waitForThumbnailsBeforeUpload,
    } = this.opts
    return {
      thumbnailWidth,
      thumbnailHeight,
      thumbnailType,
      waitForThumbnailsBeforeUpload,
      // If we don't block on thumbnails, we can lazily generate them
      lazy: !waitForThumbnailsBeforeUpload,
    }
  }

  setOptions(opts: Partial<DashboardOptions<M, B>>) {
    super.setOptions(opts)
    this.uppy
      .getPlugin(this.#getThumbnailGeneratorId())
      ?.setOptions(this.#getThumbnailGeneratorOpts())
  }

  #getThumbnailGeneratorId() {
    return `${this.id}:ThumbnailGenerator`
  }

  install = (): void => {
    // Set default state for Dashboard
    this.setPluginState({
      isHidden: true,
      fileCardFor: null,
      activeOverlayType: null,
      showAddFilesPanel: false,
      activePickerPanel: undefined,
      showFileEditor: false,
      metaFields: this.opts.metaFields,
      targets: [],
      // We'll make them visible once .containerWidth is determined
      areInsidesReadyToBeVisible: false,
      isDraggingOver: false,
    })

    const { inline, closeAfterFinish } = this.opts
    if (inline && closeAfterFinish) {
      throw new Error(
        '[Dashboard] `closeAfterFinish: true` cannot be used on an inline Dashboard, because an inline Dashboard cannot be closed at all. Either set `inline: false`, or disable the `closeAfterFinish` option.',
      )
    }

    const { allowMultipleUploads, allowMultipleUploadBatches } = this.uppy.opts
    if (
      (allowMultipleUploads || allowMultipleUploadBatches) &&
      closeAfterFinish
    ) {
      this.uppy.log(
        '[Dashboard] When using `closeAfterFinish`, we recommended setting the `allowMultipleUploadBatches` option to `false` in the Uppy constructor. See https://uppy.io/docs/uppy/#allowMultipleUploads-true',
        'warning',
      )
    }

    const { target } = this.opts

    if (target) {
      this.mount(target, this)
    }

    if (!this.opts.disableThumbnailGenerator) {
      this.uppy.use(ThumbnailGenerator, {
        id: this.#getThumbnailGeneratorId(),
        ...this.#getThumbnailGeneratorOpts(),
      })
    }

    // Dark Mode / theme
    this.darkModeMediaQuery =
      typeof window !== 'undefined' && window.matchMedia
        ? window.matchMedia('(prefers-color-scheme: dark)')
        : null

    const isDarkModeOnFromTheStart = this.darkModeMediaQuery
      ? this.darkModeMediaQuery.matches
      : false
    this.uppy.log(
      `[Dashboard] Dark mode is ${isDarkModeOnFromTheStart ? 'on' : 'off'}`,
    )
    this.setDarkModeCapability(isDarkModeOnFromTheStart)

    if (this.opts.theme === 'auto') {
      this.darkModeMediaQuery?.addListener(this.handleSystemDarkModeChange)
    }

    this.#addSpecifiedPluginsFromOptions()
    this.#autoDiscoverPlugins()
    this.initEvents()
  }

  uninstall = (): void => {
    if (!this.opts.disableThumbnailGenerator) {
      const thumbnail = this.uppy.getPlugin(`${this.id}:ThumbnailGenerator`)
      if (thumbnail) this.uppy.removePlugin(thumbnail)
    }

    const { plugins } = this.opts
    plugins.forEach((pluginID) => {
      const plugin = this.uppy.getPlugin(pluginID)
      if (plugin) (plugin as any).unmount()
    })

    if (this.opts.theme === 'auto') {
      this.darkModeMediaQuery?.removeListener(this.handleSystemDarkModeChange)
    }

    if (this.opts.disablePageScrollWhenModalOpen) {
      document.body.classList.remove('uppy-Dashboard-isFixed')
    }

    this.unmount()
    this.removeEvents()
  }
}
