import * as React from 'react'
import { Renderer } from '@tldraw/core'
import { IntlConfig, IntlProvider } from 'react-intl'
import { styled, dark } from '~styles'
import { TDDocument, TDStatus } from '~types'
import { TldrawApp, TDCallbacks } from '~state'
import { TldrawContext, useStylesheet, useKeyboardShortcuts, useTldrawApp } from '~hooks'
import { shapeUtils } from '~state/shapes'
import { ToolsPanel } from '~components/ToolsPanel'
import { TopPanel } from '~components/TopPanel'
import { ContextMenu } from '~components/ContextMenu'
import { FocusButton } from '~components/FocusButton'
import { TLDR } from '~state/TLDR'
import { GRID_SIZE } from '~constants'
import { Loading } from '~components/Loading'
import { ErrorBoundary as _Errorboundary } from 'react-error-boundary'
import { ErrorFallback } from '~components/ErrorFallback'

import messages_en from './translations/en.json'
import messages_fr from './translations/fr.json'
import messages_it from './translations/it.json'

const ErrorBoundary = _Errorboundary as any

export interface TldrawProps extends TDCallbacks {
  /**
   * (optional) If provided, the component will load / persist state under this key.
   */
  id?: string

  /**
   * (optional) The document to load or update from.
   */
  document?: TDDocument

  /**
   * (optional) The current page id.
   */
  currentPageId?: string

  /**
   * (optional) Whether the editor should immediately receive focus. Defaults to true.
   */
  autofocus?: boolean

  /**
   * (optional) Whether to show the menu UI.
   */
  showMenu?: boolean

  /**
   * (optional) Whether to show the multiplayer menu.
   */
  showMultiplayerMenu?: boolean
  /**
   * (optional) Whether to show the pages UI.
   */
  showPages?: boolean

  /**
   * (optional) Whether to show the styles UI.
   */
  showStyles?: boolean

  /**
   * (optional) Whether to show the zoom UI.
   */
  showZoom?: boolean

  /**
   * (optional) Whether to show the tools UI.
   */
  showTools?: boolean

  /**
   * (optional) Whether to show a sponsor link for Tldraw.
   */
  showSponsorLink?: boolean

  /**
   * (optional) Whether to show the UI.
   */
  showUI?: boolean

  /**
   * (optional) Whether to the document should be read only.
   */
  readOnly?: boolean

  /**
   * (optional) Whether to to show the app's dark mode UI.
   */
  darkMode?: boolean

  /**
   * (optional) If provided, image/video componnets will be disabled.
   *
   * Warning: Keeping this enabled for multiplayer applications without provifing a storage
   * bucket based solution will cause massive base64 string to be written to the liveblocks room.
   */
  disableAssets?: boolean
}

export function Tldraw({
  id,
  document,
  currentPageId,
  autofocus = true,
  showMenu = true,
  showMultiplayerMenu = true,
  showPages = true,
  showTools = true,
  showZoom = true,
  showStyles = true,
  showUI = true,
  readOnly = false,
  disableAssets = false,
  darkMode = false,
  showSponsorLink,
  onMount,
  onChange,
  onChangePresence,
  onNewProject,
  onSaveProject,
  onSaveProjectAs,
  onOpenProject,
  onOpenMedia,
  onSignOut,
  onSignIn,
  onUndo,
  onRedo,
  onPersist,
  onPatch,
  onCommand,
  onChangePage,
  onAssetCreate,
  onAssetDelete,
  onAssetUpload,
  onExport,
}: TldrawProps) {
  const [sId, setSId] = React.useState(id)

  // Create a new app when the component mounts.
  const [app, setApp] = React.useState(() => {
    const app = new TldrawApp(id, {
      onMount,
      onChange,
      onChangePresence,
      onNewProject,
      onSaveProject,
      onSaveProjectAs,
      onOpenProject,
      onOpenMedia,
      onSignOut,
      onSignIn,
      onUndo,
      onRedo,
      onPersist,
      onPatch,
      onCommand,
      onChangePage,
      onAssetDelete,
      onAssetCreate,
      onAssetUpload,
    })
    return app
  })

  // Create a new app if the `id` prop changes.
  React.useLayoutEffect(() => {
    if (id === sId) return
    const newApp = new TldrawApp(id, {
      onMount,
      onChange,
      onChangePresence,
      onNewProject,
      onSaveProject,
      onSaveProjectAs,
      onOpenProject,
      onOpenMedia,
      onSignOut,
      onSignIn,
      onUndo,
      onRedo,
      onPersist,
      onPatch,
      onCommand,
      onChangePage,
      onAssetDelete,
      onAssetCreate,
      onAssetUpload,
      onExport,
    })

    setSId(id)

    setApp(newApp)
  }, [sId, id])

  // Update the document if the `document` prop changes but the ids,
  // are the same, or else load a new document if the ids are different.
  React.useEffect(() => {
    if (!document) return

    if (document.id === app.document.id) {
      app.updateDocument(document)
    } else {
      app.loadDocument(document)
    }
  }, [document, app])

  // Disable assets when the `disableAssets` prop changes.
  React.useEffect(() => {
    app.setDisableAssets(disableAssets)
  }, [app, disableAssets])

  // Change the page when the `currentPageId` prop changes.
  React.useEffect(() => {
    if (!currentPageId) return
    app.changePage(currentPageId)
  }, [currentPageId, app])

  // Toggle the app's readOnly mode when the `readOnly` prop changes.
  React.useEffect(() => {
    app.readOnly = readOnly
  }, [app, readOnly])

  // Toggle the app's darkMode when the `darkMode` prop changes.
  React.useEffect(() => {
    if (darkMode !== app.settings.isDarkMode) {
      app.toggleDarkMode()
    }
  }, [app, darkMode])

  // Update the app's callbacks when any callback changes.
  React.useEffect(() => {
    app.callbacks = {
      onMount,
      onChange,
      onChangePresence,
      onNewProject,
      onSaveProject,
      onSaveProjectAs,
      onOpenProject,
      onOpenMedia,
      onSignOut,
      onSignIn,
      onUndo,
      onRedo,
      onPersist,
      onPatch,
      onCommand,
      onChangePage,
      onAssetDelete,
      onAssetCreate,
      onAssetUpload,
      onExport,
    }
  }, [
    onMount,
    onChange,
    onChangePresence,
    onNewProject,
    onSaveProject,
    onSaveProjectAs,
    onOpenProject,
    onOpenMedia,
    onSignOut,
    onSignIn,
    onUndo,
    onRedo,
    onPersist,
    onPatch,
    onCommand,
    onChangePage,
    onAssetDelete,
    onAssetCreate,
    onAssetUpload,
    onExport,
  ])

  React.useLayoutEffect(() => {
    if (typeof window === 'undefined') return
    if (!window.document?.fonts) return

    function refreshBoundingBoxes() {
      app.refreshBoundingBoxes()
    }
    window.document.fonts.addEventListener('loadingdone', refreshBoundingBoxes)
    return () => {
      window.document.fonts.removeEventListener('loadingdone', refreshBoundingBoxes)
    }
  }, [app])

  // Use the `key` to ensure that new selector hooks are made when the id changes
  return (
    <TldrawContext.Provider value={app}>
      <InnerTldraw
        key={sId || 'Tldraw'}
        id={sId}
        autofocus={autofocus}
        showPages={showPages}
        showMenu={showMenu}
        showMultiplayerMenu={showMultiplayerMenu}
        showStyles={showStyles}
        showZoom={showZoom}
        showTools={showTools}
        showUI={showUI}
        showSponsorLink={showSponsorLink}
        readOnly={readOnly}
      />
    </TldrawContext.Provider>
  )
}

interface InnerTldrawProps {
  id?: string
  autofocus: boolean
  readOnly: boolean
  showPages: boolean
  showMenu: boolean
  showMultiplayerMenu: boolean
  showZoom: boolean
  showStyles: boolean
  showUI: boolean
  showTools: boolean
  showSponsorLink?: boolean
}

const InnerTldraw = React.memo(function InnerTldraw({
  id,
  autofocus,
  showPages,
  showMenu,
  showMultiplayerMenu,
  showZoom,
  showStyles,
  showTools,
  showSponsorLink,
  readOnly,
  showUI,
}: InnerTldrawProps) {
  const app = useTldrawApp()

  const rWrapper = React.useRef<HTMLDivElement>(null)

  const state = app.useStore()

  const { document, settings, appState, room } = state

  const isSelecting = state.appState.activeTool === 'select'

  const page = document.pages[appState.currentPageId]
  const pageState = document.pageStates[page.id]
  const assets = document.assets
  const { selectedIds } = pageState

  const isHideBoundsShape =
    selectedIds.length === 1 &&
    page.shapes[selectedIds[0]] &&
    TLDR.getShapeUtil(page.shapes[selectedIds[0]].type).hideBounds

  const isHideResizeHandlesShape =
    selectedIds.length === 1 &&
    page.shapes[selectedIds[0]] &&
    TLDR.getShapeUtil(page.shapes[selectedIds[0]].type).hideResizeHandles

  // Custom rendering meta, with dark mode for shapes
  const meta = React.useMemo(() => {
    return { isDarkMode: settings.isDarkMode }
  }, [settings.isDarkMode])

  const showDashedBrush = settings.isCadSelectMode
    ? !appState.selectByContain
    : appState.selectByContain

  // Custom theme, based on darkmode
  const theme = React.useMemo(() => {
    const { selectByContain } = appState
    const { isDarkMode, isCadSelectMode } = settings

    if (isDarkMode) {
      const brushBase = isCadSelectMode
        ? selectByContain
          ? '69, 155, 255'
          : '105, 209, 73'
        : '180, 180, 180'
      return {
        brushFill: `rgba(${brushBase}, ${isCadSelectMode ? 0.08 : 0.05})`,
        brushStroke: `rgba(${brushBase}, ${isCadSelectMode ? 0.5 : 0.25})`,
        brushDashStroke: `rgba(${brushBase}, .6)`,
        selected: 'rgba(38, 150, 255, 1.000)',
        selectFill: 'rgba(38, 150, 255, 0.05)',
        background: '#212529',
        foreground: '#49555f',
      }
    }

    const brushBase = isCadSelectMode ? (selectByContain ? '0, 89, 242' : '51, 163, 23') : '0,0,0'

    return {
      brushFill: `rgba(${brushBase}, ${isCadSelectMode ? 0.08 : 0.05})`,
      brushStroke: `rgba(${brushBase}, ${isCadSelectMode ? 0.4 : 0.25})`,
      brushDashStroke: `rgba(${brushBase}, .6)`,
    }
  }, [settings.isDarkMode, settings.isCadSelectMode, appState.selectByContain])

  const isInSession = app.session !== undefined

  // Hide bounds when not using the select tool, or when the only selected shape has handles
  const hideBounds =
    (isInSession && app.session?.constructor.name !== 'BrushSession') ||
    !isSelecting ||
    isHideBoundsShape ||
    !!pageState.editingId

  // Hide bounds when not using the select tool, or when in session
  const hideHandles = isInSession || !isSelecting

  // Hide indicators when not using the select tool, or when in session
  const hideIndicators =
    (isInSession && state.appState.status !== TDStatus.Brushing) || !isSelecting

  const hideCloneHandles =
    isInSession || !isSelecting || !settings.showCloneHandles || pageState.camera.zoom < 0.2

  const messages = {
    en: messages_en,
    fr: messages_fr,
    it: messages_it,
  }

  const defaultLanguage = settings.language ?? navigator.language.split(/[-_]/)[0]

  return (
    <IntlProvider
      locale={defaultLanguage}
      messages={messages[defaultLanguage] as IntlConfig['messages']}
    >
      <StyledLayout ref={rWrapper} tabIndex={-0} className={settings.isDarkMode ? dark : ''}>
        <Loading />
        <OneOff focusableRef={rWrapper} autofocus={autofocus} />
        <ContextMenu>
          <ErrorBoundary FallbackComponent={ErrorFallback}>
            <Renderer
              id={id}
              containerRef={rWrapper}
              shapeUtils={shapeUtils}
              page={page}
              pageState={pageState}
              assets={assets}
              snapLines={appState.snapLines}
              eraseLine={appState.eraseLine}
              grid={GRID_SIZE}
              users={room?.users}
              userId={room?.userId}
              theme={theme}
              meta={meta}
              hideBounds={hideBounds}
              hideHandles={hideHandles}
              hideResizeHandles={isHideResizeHandlesShape}
              hideIndicators={hideIndicators}
              hideBindingHandles={!settings.showBindingHandles}
              hideCloneHandles={hideCloneHandles}
              hideRotateHandles={!settings.showRotateHandles}
              hideGrid={!settings.showGrid}
              showDashedBrush={showDashedBrush}
              performanceMode={app.session?.performanceMode}
              onPinchStart={app.onPinchStart}
              onPinchEnd={app.onPinchEnd}
              onPinch={app.onPinch}
              onPan={app.onPan}
              onZoom={app.onZoom}
              onPointerDown={app.onPointerDown}
              onPointerMove={app.onPointerMove}
              onPointerUp={app.onPointerUp}
              onPointCanvas={app.onPointCanvas}
              onDoubleClickCanvas={app.onDoubleClickCanvas}
              onRightPointCanvas={app.onRightPointCanvas}
              onDragCanvas={app.onDragCanvas}
              onReleaseCanvas={app.onReleaseCanvas}
              onPointShape={app.onPointShape}
              onDoubleClickShape={app.onDoubleClickShape}
              onRightPointShape={app.onRightPointShape}
              onDragShape={app.onDragShape}
              onHoverShape={app.onHoverShape}
              onUnhoverShape={app.onUnhoverShape}
              onReleaseShape={app.onReleaseShape}
              onPointBounds={app.onPointBounds}
              onDoubleClickBounds={app.onDoubleClickBounds}
              onRightPointBounds={app.onRightPointBounds}
              onDragBounds={app.onDragBounds}
              onHoverBounds={app.onHoverBounds}
              onUnhoverBounds={app.onUnhoverBounds}
              onReleaseBounds={app.onReleaseBounds}
              onPointBoundsHandle={app.onPointBoundsHandle}
              onDoubleClickBoundsHandle={app.onDoubleClickBoundsHandle}
              onRightPointBoundsHandle={app.onRightPointBoundsHandle}
              onDragBoundsHandle={app.onDragBoundsHandle}
              onHoverBoundsHandle={app.onHoverBoundsHandle}
              onUnhoverBoundsHandle={app.onUnhoverBoundsHandle}
              onReleaseBoundsHandle={app.onReleaseBoundsHandle}
              onPointHandle={app.onPointHandle}
              onDoubleClickHandle={app.onDoubleClickHandle}
              onRightPointHandle={app.onRightPointHandle}
              onDragHandle={app.onDragHandle}
              onHoverHandle={app.onHoverHandle}
              onUnhoverHandle={app.onUnhoverHandle}
              onReleaseHandle={app.onReleaseHandle}
              onError={app.onError}
              onRenderCountChange={app.onRenderCountChange}
              onShapeChange={app.onShapeChange}
              onShapeBlur={app.onShapeBlur}
              onShapeClone={app.onShapeClone}
              onBoundsChange={app.updateBounds}
              onKeyDown={app.onKeyDown}
              onKeyUp={app.onKeyUp}
              onDragOver={app.onDragOver}
              onDrop={app.onDrop}
            />
          </ErrorBoundary>
        </ContextMenu>
        {showUI && (
          <StyledUI>
            {settings.isFocusMode ? (
              <FocusButton onSelect={app.toggleFocusMode} />
            ) : (
              <>
                <TopPanel
                  readOnly={readOnly}
                  showPages={showPages}
                  showMenu={showMenu}
                  showMultiplayerMenu={showMultiplayerMenu}
                  showStyles={showStyles}
                  showZoom={showZoom}
                  sponsor={showSponsorLink}
                />
                <StyledSpacer />
                {showTools && !readOnly && <ToolsPanel />}
              </>
            )}
          </StyledUI>
        )}
      </StyledLayout>
    </IntlProvider>
  )
})

const OneOff = React.memo(function OneOff({
  focusableRef,
  autofocus,
}: {
  autofocus?: boolean
  focusableRef: React.RefObject<HTMLDivElement>
}) {
  useKeyboardShortcuts(focusableRef)
  useStylesheet()

  React.useEffect(() => {
    if (autofocus) {
      focusableRef.current?.focus()
    }
  }, [autofocus])

  return null
})

const StyledLayout = styled('div', {
  position: 'absolute',
  height: '100%',
  width: '100%',
  minHeight: 0,
  minWidth: 0,
  maxHeight: '100%',
  maxWidth: '100%',
  overflow: 'hidden',
  boxSizing: 'border-box',
  outline: 'none',

  '& .tl-container': {
    position: 'absolute',
    top: 0,
    left: 0,
    height: '100%',
    width: '100%',
    zIndex: 1,
  },

  '& input, textarea, button, select, label, button': {
    webkitTouchCallout: 'none',
    webkitUserSelect: 'none',
    '-webkit-tap-highlight-color': 'transparent',
    'tap-highlight-color': 'transparent',
  },
})

const StyledUI = styled('div', {
  position: 'absolute',
  top: 0,
  left: 0,
  height: '100%',
  width: '100%',
  padding: '8px 8px 0 8px',
  display: 'flex',
  alignItems: 'flex-start',
  justifyContent: 'flex-start',
  pointerEvents: 'none',
  zIndex: 2,
  '& > *': {
    pointerEvents: 'all',
  },
})

const StyledSpacer = styled('div', {
  flexGrow: 2,
})