import React from 'react'
import { findNodeHandle, StyleSheet } from 'react-native'
import type { CameraDevice } from './types/CameraDevice'
import type { CameraCaptureError } from './CameraError'
import { CameraRuntimeError, tryParseNativeCameraError, isErrorWithCause } from './CameraError'
import type { CameraProps, DrawableFrameProcessor, OnShutterEvent, ReadonlyFrameProcessor } from './types/CameraProps'
import { CameraModule } from './NativeCameraModule'
import type { PhotoFile, TakePhotoOptions } from './types/PhotoFile'
import type { Point } from './types/Point'
import type { RecordVideoOptions, VideoFile } from './types/VideoFile'
import { VisionCameraProxy } from './frame-processors/VisionCameraProxy'
import { CameraDevices } from './CameraDevices'
import type { EmitterSubscription, NativeSyntheticEvent, NativeMethods } from 'react-native'
import type { TakeSnapshotOptions } from './types/Snapshot'
import { SkiaCameraCanvas } from './skia/SkiaCameraCanvas'
import type { Frame } from './types/Frame'
import { FpsGraph, MAX_BARS } from './FpsGraph'
import type {
  AverageFpsChangedEvent,
  NativeCameraViewProps,
  OnCodeScannedEvent,
  OnErrorEvent,
  OutputOrientationChangedEvent,
  PreviewOrientationChangedEvent,
} from './NativeCameraView'
import { NativeCameraView } from './NativeCameraView'
import { RotationHelper } from './RotationHelper'

//#region Types
export type CameraPermissionStatus = 'granted' | 'not-determined' | 'denied' | 'restricted'
export type CameraPermissionRequestResult = 'granted' | 'denied'

type NativeRecordVideoOptions = Omit<RecordVideoOptions, 'onRecordingError' | 'onRecordingFinished'>
type RefType = React.Component<NativeCameraViewProps> & Readonly<NativeMethods>
interface CameraState {
  isRecordingWithFlash: boolean
  averageFpsSamples: number[]
}
//#endregion

function isSkiaFrameProcessor(frameProcessor?: ReadonlyFrameProcessor | DrawableFrameProcessor): frameProcessor is DrawableFrameProcessor {
  return frameProcessor?.type === 'drawable-skia'
}

//#region Camera Component
/**
 * ### A powerful `<Camera>` component.
 *
 * Read the [VisionCamera documentation](https://react-native-vision-camera.com/) for more information.
 *
 * The `<Camera>` component's most important properties are:
 *
 * * {@linkcode CameraProps.device | device}: Specifies the {@linkcode CameraDevice} to use. Get a {@linkcode CameraDevice} by using
 * the {@linkcode useCameraDevice | useCameraDevice(..)} hook, or manually by using
 * the {@linkcode CameraDevices.getAvailableCameraDevices | CameraDevices.getAvailableCameraDevices()} function.
 * * {@linkcode CameraProps.isActive | isActive}: A boolean value that specifies whether the Camera should
 * actively stream video frames or not. This can be compared to a Video component, where `isActive` specifies whether the video
 * is paused or not. If you fully unmount the `<Camera>` component instead of using `isActive={false}`, the Camera will take a bit longer to start again.
 *
 * @example
 * ```tsx
 * function App() {
 *   const device = useCameraDevice('back')
 *
 *   if (device == null) return <NoCameraErrorView />
 *   return (
 *     <Camera
 *       style={StyleSheet.absoluteFill}
 *       device={device}
 *       isActive={true}
 *     />
 *   )
 * }
 * ```
 *
 * @component
 */
export class Camera extends React.PureComponent<CameraProps, CameraState> {
  /** @internal */
  static displayName = 'Camera'
  /** @internal */
  displayName = Camera.displayName
  private lastFrameProcessor: ((frame: Frame) => void) | undefined
  private isNativeViewMounted = false
  private lastUIRotation: number | undefined = undefined
  private rotationHelper = new RotationHelper()

  private readonly ref: React.RefObject<RefType>

  /** @internal */
  constructor(props: CameraProps) {
    super(props)
    this.onViewReady = this.onViewReady.bind(this)
    this.onAverageFpsChanged = this.onAverageFpsChanged.bind(this)
    this.onInitialized = this.onInitialized.bind(this)
    this.onStarted = this.onStarted.bind(this)
    this.onStopped = this.onStopped.bind(this)
    this.onPreviewStarted = this.onPreviewStarted.bind(this)
    this.onPreviewStopped = this.onPreviewStopped.bind(this)
    this.onShutter = this.onShutter.bind(this)
    this.onOutputOrientationChanged = this.onOutputOrientationChanged.bind(this)
    this.onPreviewOrientationChanged = this.onPreviewOrientationChanged.bind(this)
    this.onError = this.onError.bind(this)
    this.onCodeScanned = this.onCodeScanned.bind(this)
    this.ref = React.createRef<RefType>()
    this.lastFrameProcessor = undefined
    this.state = {
      isRecordingWithFlash: false,
      averageFpsSamples: [],
    }
  }

  private get handle(): number {
    const nodeHandle = findNodeHandle(this.ref.current)
    if (nodeHandle == null || nodeHandle === -1) {
      throw new CameraRuntimeError(
        'system/view-not-found',
        "Could not get the Camera's native view tag! Does the Camera View exist in the native view-tree?",
      )
    }

    return nodeHandle
  }

  //#region View-specific functions (UIViewManager)
  /**
   * Take a single photo and write it's content to a temporary file.
   *
   * @throws {@linkcode CameraCaptureError} When any kind of error occured while capturing the photo.
   * Use the {@linkcode CameraCaptureError.code | code} property to get the actual error
   * @example
   * ```ts
   * const photo = await camera.current.takePhoto({
   *   flash: 'on',
   *   enableAutoRedEyeReduction: true
   * })
   * ```
   */
  public async takePhoto(options?: TakePhotoOptions): Promise<PhotoFile> {
    try {
      return await CameraModule.takePhoto(this.handle, options ?? {})
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }

  /**
   * Captures a snapshot of the Camera view and write it's content to a temporary file.
   *
   * - On iOS, `takeSnapshot` waits for a Frame from the video pipeline and therefore requires `video` to be enabled.
   * - On Android, `takeSnapshot` performs a GPU view screenshot from the preview view.
   *
   * @throws {@linkcode CameraCaptureError} When any kind of error occured while capturing the photo.
   * Use the {@linkcode CameraCaptureError.code | code} property to get the actual error
   * @example
   * ```ts
   * const snapshot = await camera.current.takeSnapshot({
   *   quality: 100
   * })
   * ```
   */
  public async takeSnapshot(options?: TakeSnapshotOptions): Promise<PhotoFile> {
    try {
      return await CameraModule.takeSnapshot(this.handle, options ?? {})
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }

  private getBitRateMultiplier(bitRate: CameraProps['videoBitRate']): number {
    if (typeof bitRate === 'number' || bitRate == null) return 1
    switch (bitRate) {
      case 'extra-low':
        return 0.6
      case 'low':
        return 0.8
      case 'normal':
        return 1
      case 'high':
        return 1.2
      case 'extra-high':
        return 1.4
    }
  }

  /**
   * Start a new video recording.
   *
   * @throws {@linkcode CameraCaptureError} When any kind of error occured while starting the video recording.
   * Use the {@linkcode CameraCaptureError.code | code} property to get the actual error
   *
   * @example
   * ```ts
   * camera.current.startRecording({
   *   onRecordingFinished: (video) => console.log(video),
   *   onRecordingError: (error) => console.error(error),
   * })
   * setTimeout(() => {
   *   camera.current.stopRecording()
   * }, 5000)
   * ```
   */
  public startRecording(options: RecordVideoOptions): void {
    const { onRecordingError, onRecordingFinished, ...passThruOptions } = options
    if (typeof onRecordingError !== 'function' || typeof onRecordingFinished !== 'function')
      throw new CameraRuntimeError('parameter/invalid-parameter', 'The onRecordingError or onRecordingFinished functions were not set!')

    if (options.flash === 'on') {
      // Enable torch for video recording
      this.setState({
        isRecordingWithFlash: true,
      })
    }

    const onRecordCallback = (video?: VideoFile, error?: CameraCaptureError): void => {
      if (this.state.isRecordingWithFlash) {
        // disable torch again if it was enabled
        this.setState({
          isRecordingWithFlash: false,
        })
      }

      if (error != null) return onRecordingError(error)
      if (video != null) return onRecordingFinished(video)
    }

    const nativeRecordVideoOptions: NativeRecordVideoOptions = passThruOptions
    try {
      // TODO: Use TurboModules to make this awaitable.
      CameraModule.startRecording(this.handle, nativeRecordVideoOptions, onRecordCallback)
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }

  /**
   * Pauses the current video recording.
   *
   * @throws {@linkcode CameraCaptureError} When any kind of error occured while pausing the video recording.
   * Use the {@linkcode CameraCaptureError.code | code} property to get the actual error
   *
   * @example
   * ```ts
   * // Start
   * await camera.current.startRecording({
   *   onRecordingFinished: (video) => console.log(video),
   *   onRecordingError: (error) => console.error(error),
   * })
   * await timeout(1000)
   * // Pause
   * await camera.current.pauseRecording()
   * await timeout(500)
   * // Resume
   * await camera.current.resumeRecording()
   * await timeout(2000)
   * // Stop
   * await camera.current.stopRecording()
   * ```
   */
  public async pauseRecording(): Promise<void> {
    try {
      return await CameraModule.pauseRecording(this.handle)
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }

  /**
   * Resumes a currently paused video recording.
   *
   * @throws {@linkcode CameraCaptureError} When any kind of error occured while resuming the video recording.
   * Use the {@linkcode CameraCaptureError.code | code} property to get the actual error
   *
   * @example
   * ```ts
   * // Start
   * await camera.current.startRecording({
   *   onRecordingFinished: (video) => console.log(video),
   *   onRecordingError: (error) => console.error(error),
   * })
   * await timeout(1000)
   * // Pause
   * await camera.current.pauseRecording()
   * await timeout(500)
   * // Resume
   * await camera.current.resumeRecording()
   * await timeout(2000)
   * // Stop
   * await camera.current.stopRecording()
   * ```
   */
  public async resumeRecording(): Promise<void> {
    try {
      return await CameraModule.resumeRecording(this.handle)
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }

  /**
   * Stop the current video recording.
   *
   * @throws {@linkcode CameraCaptureError} When any kind of error occured while stopping the video recording.
   * Use the {@linkcode CameraCaptureError.code | code} property to get the actual error
   *
   * @example
   * ```ts
   * await camera.current.startRecording({
   *   onRecordingFinished: (video) => console.log(video),
   *   onRecordingError: (error) => console.error(error),
   * })
   * setTimeout(async () => {
   *   await camera.current.stopRecording()
   * }, 5000)
   * ```
   */
  public async stopRecording(): Promise<void> {
    try {
      return await CameraModule.stopRecording(this.handle)
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }

  /**
   * Cancel the current video recording. The temporary video file will be deleted,
   * and the `startRecording`'s `onRecordingError` callback will be invoked with a `capture/recording-canceled` error.
   *
   * @throws {@linkcode CameraCaptureError} When any kind of error occured while canceling the video recording.
   * Use the {@linkcode CameraCaptureError.code | code} property to get the actual error
   *
   * @example
   * ```ts
   * await camera.current.startRecording({
   *   onRecordingFinished: (video) => console.log(video),
   *   onRecordingError: (error) => {
   *     if (error.code === 'capture/recording-canceled') {
   *       // recording was canceled.
   *     } else {
   *       console.error(error)
   *     }
   *   },
   * })
   * setTimeout(async () => {
   *   await camera.current.cancelRecording()
   * }, 5000)
   * ```
   */
  public async cancelRecording(): Promise<void> {
    try {
      return await CameraModule.cancelRecording(this.handle)
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }

  /**
   * Focus the camera to a specific point in the coordinate system.
   * @param {Point} point The point to focus to. This should be relative
   * to the Camera view's coordinate system and is expressed in points.
   *  * `(0, 0)` means **top left**.
   *  * `(CameraView.width, CameraView.height)` means **bottom right**.
   *
   * Make sure the value doesn't exceed the CameraView's dimensions.
   *
   * @throws {@linkcode CameraRuntimeError} When any kind of error occured while focussing.
   * Use the {@linkcode CameraRuntimeError.code | code} property to get the actual error
   * @example
   * ```ts
   * await camera.current.focus({
   *   x: tapEvent.x,
   *   y: tapEvent.y
   * })
   * ```
   */
  public async focus(point: Point): Promise<void> {
    try {
      return await CameraModule.focus(this.handle, point)
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }
  //#endregion

  //#region Static Functions (NativeModule)
  /**
   * Get a list of all available camera devices on the current phone.
   *
   * If you use Hooks, use the `useCameraDevices(..)` hook instead.
   *
   * * For Camera Devices attached to the phone, it is safe to assume that this will never change.
   * * For external Camera Devices (USB cameras, Mac continuity cameras, etc.) the available Camera Devices
   * could change over time when the external Camera device gets plugged in or plugged out, so
   * use {@link addCameraDevicesChangedListener | addCameraDevicesChangedListener(...)} to listen for such changes.
   *
   * @example
   * ```ts
   * const devices = Camera.getAvailableCameraDevices()
   * const backCameras = devices.filter((d) => d.position === "back")
   * const frontCameras = devices.filter((d) => d.position === "front")
   * ```
   */
  public static getAvailableCameraDevices(): CameraDevice[] {
    return CameraDevices.getAvailableCameraDevices()
  }
  /**
   * Adds a listener that gets called everytime the Camera Devices change, for example
   * when an external Camera Device (USB or continuity Camera) gets plugged in or plugged out.
   *
   * If you use Hooks, use the `useCameraDevices()` hook instead.
   */
  public static addCameraDevicesChangedListener(listener: (newDevices: CameraDevice[]) => void): EmitterSubscription {
    return CameraDevices.addCameraDevicesChangedListener(listener)
  }
  /**
   * Gets the current Camera Permission Status. Check this before mounting the Camera to ensure
   * the user has permitted the app to use the camera.
   *
   * To actually prompt the user for camera permission, use {@linkcode Camera.requestCameraPermission | requestCameraPermission()}.
   */
  public static getCameraPermissionStatus(): CameraPermissionStatus {
    return CameraModule.getCameraPermissionStatus()
  }
  /**
   * Gets the current Microphone-Recording Permission Status.
   * Check this before enabling the `audio={...}` property to make sure the
   * user has permitted the app to use the microphone.
   *
   * To actually prompt the user for microphone permission, use {@linkcode Camera.requestMicrophonePermission | requestMicrophonePermission()}.
   */
  public static getMicrophonePermissionStatus(): CameraPermissionStatus {
    return CameraModule.getMicrophonePermissionStatus()
  }
  /**
   * Gets the current Location Permission Status.
   * Check this before enabling the `location={...}` property to make sure the
   * the user has permitted the app to use the location.
   *
   * To actually prompt the user for location permission, use {@linkcode Camera.requestLocationPermission | requestLocationPermission()}.
   *
   * Note: This method will throw a `system/location-not-enabled` error if the Location APIs are not enabled at build-time.
   * See [the "GPS Location Tags" documentation](https://react-native-vision-camera.com/docs/guides/location) for more information.
   */
  public static getLocationPermissionStatus(): CameraPermissionStatus {
    return CameraModule.getLocationPermissionStatus()
  }
  /**
   * Shows a "request permission" alert to the user, and resolves with the new camera permission status.
   *
   * If the user has previously blocked the app from using the camera, the alert will not be shown
   * and `"denied"` will be returned.
   *
   * @throws {@linkcode CameraRuntimeError} When any kind of error occured while requesting permission.
   * Use the {@linkcode CameraRuntimeError.code | code} property to get the actual error
   */
  public static async requestCameraPermission(): Promise<CameraPermissionRequestResult> {
    try {
      return await CameraModule.requestCameraPermission()
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }
  /**
   * Shows a "request permission" alert to the user, and resolves with the new microphone permission status.
   *
   * If the user has previously blocked the app from using the microphone, the alert will not be shown
   * and `"denied"` will be returned.
   *
   * @throws {@linkcode CameraRuntimeError} When any kind of error occured while requesting permission.
   * Use the {@linkcode CameraRuntimeError.code | code} property to get the actual error
   */
  public static async requestMicrophonePermission(): Promise<CameraPermissionRequestResult> {
    try {
      return await CameraModule.requestMicrophonePermission()
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }
  /**
   * Shows a "request permission" alert to the user, and resolves with the new location permission status.
   *
   * If the user has previously blocked the app from using the location, the alert will not be shown
   * and `"denied"` will be returned.
   *
   * @throws {@linkcode CameraRuntimeError} When any kind of error occured while requesting permission.
   * Use the {@linkcode CameraRuntimeError.code | code} property to get the actual error
   */
  public static async requestLocationPermission(): Promise<CameraPermissionRequestResult> {
    try {
      return await CameraModule.requestLocationPermission()
    } catch (e) {
      throw tryParseNativeCameraError(e)
    }
  }
  //#endregion

  //#region Events (Wrapped to maintain reference equality)
  private onError(event: NativeSyntheticEvent<OnErrorEvent>): void {
    const error = event.nativeEvent
    const cause = isErrorWithCause(error.cause) ? error.cause : undefined
    // @ts-expect-error We're casting from unknown bridge types to TS unions, I expect it to hopefully work
    const cameraError = new CameraRuntimeError(error.code, error.message, cause)

    if (this.props.onError != null) {
      this.props.onError(cameraError)
    } else {
      // User didn't pass an `onError` handler, so just log it to console
      console.error(cameraError)
    }
  }

  private onInitialized(): void {
    this.props.onInitialized?.()
  }

  private onStarted(): void {
    this.props.onStarted?.()
  }

  private onStopped(): void {
    this.props.onStopped?.()
  }

  private onPreviewStarted(): void {
    this.props.onPreviewStarted?.()
  }

  private onPreviewStopped(): void {
    this.props.onPreviewStopped?.()
  }

  private onShutter(event: NativeSyntheticEvent<OnShutterEvent>): void {
    this.props.onShutter?.(event.nativeEvent)
  }

  private onOutputOrientationChanged({ nativeEvent: { outputOrientation } }: NativeSyntheticEvent<OutputOrientationChangedEvent>): void {
    this.rotationHelper.outputOrientation = outputOrientation
    this.props.onOutputOrientationChanged?.(outputOrientation)
    this.maybeUpdateUIRotation()
  }

  private onPreviewOrientationChanged({ nativeEvent: { previewOrientation } }: NativeSyntheticEvent<PreviewOrientationChangedEvent>): void {
    this.rotationHelper.previewOrientation = previewOrientation
    this.props.onPreviewOrientationChanged?.(previewOrientation)
    this.maybeUpdateUIRotation()

    if (isSkiaFrameProcessor(this.props.frameProcessor)) {
      // If we have a Skia Frame Processor, we need to update it's orientation so it knows how to render.
      this.props.frameProcessor.previewOrientation.value = previewOrientation
    }
  }

  private maybeUpdateUIRotation(): void {
    const uiRotation = this.rotationHelper.uiRotation
    if (uiRotation !== this.lastUIRotation) {
      this.props.onUIRotationChanged?.(uiRotation)
      this.lastUIRotation = uiRotation
    }
  }
  //#endregion

  private onCodeScanned(event: NativeSyntheticEvent<OnCodeScannedEvent>): void {
    const codeScanner = this.props.codeScanner
    if (codeScanner == null) return

    codeScanner.onCodeScanned(event.nativeEvent.codes, event.nativeEvent.frame)
  }

  //#region Lifecycle
  private setFrameProcessor(frameProcessor: (frame: Frame) => void): void {
    VisionCameraProxy.setFrameProcessor(this.handle, frameProcessor)
  }

  private unsetFrameProcessor(): void {
    VisionCameraProxy.removeFrameProcessor(this.handle)
  }

  private onViewReady(): void {
    this.isNativeViewMounted = true
    if (this.props.frameProcessor != null) {
      // user passed a `frameProcessor` but we didn't set it yet because the native view was not mounted yet. set it now.
      this.setFrameProcessor(this.props.frameProcessor.frameProcessor)
      this.lastFrameProcessor = this.props.frameProcessor.frameProcessor
    }
  }

  private onAverageFpsChanged({ nativeEvent: { averageFps } }: NativeSyntheticEvent<AverageFpsChangedEvent>): void {
    this.setState((state) => {
      const averageFpsSamples = [...state.averageFpsSamples, averageFps]
      while (averageFpsSamples.length >= MAX_BARS + 1) {
        // we keep a maximum of 30 FPS samples in our history
        averageFpsSamples.shift()
      }

      return {
        ...state,
        averageFpsSamples: averageFpsSamples,
      }
    })
  }

  /** @internal */
  componentDidUpdate(): void {
    if (!this.isNativeViewMounted) return
    const frameProcessor = this.props.frameProcessor
    if (frameProcessor?.frameProcessor !== this.lastFrameProcessor) {
      // frameProcessor argument identity changed. Update native to reflect the change.
      if (frameProcessor != null) this.setFrameProcessor(frameProcessor.frameProcessor)
      else this.unsetFrameProcessor()

      this.lastFrameProcessor = frameProcessor?.frameProcessor
    }
  }
  //#endregion

  /** @internal */
  public render(): React.ReactNode {
    // We remove the big `device` object from the props because we only need to pass `cameraId` to native.
    const { device, frameProcessor, codeScanner, enableFpsGraph, fps, videoBitRate, ...props } = this.props

    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
    if (device == null) {
      throw new CameraRuntimeError(
        'device/no-device',
        'Camera: `device` is null! Select a valid Camera device. See: https://mrousavy.com/react-native-vision-camera/docs/guides/devices',
      )
    }

    const shouldEnableBufferCompression = props.video === true && frameProcessor == null
    const torch = this.state.isRecordingWithFlash ? 'on' : props.torch
    const isRenderingWithSkia = isSkiaFrameProcessor(frameProcessor)
    const shouldBeMirrored = device.position === 'front'

    // minFps/maxFps is either the fixed `fps` value, or a value from the [min, max] tuple
    const minFps = fps == null ? undefined : typeof fps === 'number' ? fps : fps[0]
    const maxFps = fps == null ? undefined : typeof fps === 'number' ? fps : fps[1]

    // bitrate is number (override) or string (multiplier)
    let bitRateMultiplier: number | undefined
    let bitRateOverride: number | undefined
    if (typeof videoBitRate === 'number') {
      // If the user passed an absolute number as a bit-rate, we just use this as a full override.
      bitRateOverride = videoBitRate
    } else if (typeof videoBitRate === 'string' && videoBitRate !== 'normal') {
      // If the user passed 'low'/'normal'/'high', we need to apply this as a multiplier to the native bitrate instead of absolutely setting it
      bitRateMultiplier = this.getBitRateMultiplier(videoBitRate)
    }

    return (
      <NativeCameraView
        {...props}
        cameraId={device.id}
        ref={this.ref}
        torch={torch}
        minFps={minFps}
        maxFps={maxFps}
        isMirrored={props.isMirrored ?? shouldBeMirrored}
        onViewReady={this.onViewReady}
        onAverageFpsChanged={enableFpsGraph ? this.onAverageFpsChanged : undefined}
        onInitialized={this.onInitialized}
        onCodeScanned={this.onCodeScanned}
        onStarted={this.onStarted}
        onStopped={this.onStopped}
        onPreviewStarted={this.onPreviewStarted}
        onPreviewStopped={this.onPreviewStopped}
        onShutter={this.onShutter}
        videoBitRateMultiplier={bitRateMultiplier}
        videoBitRateOverride={bitRateOverride}
        onOutputOrientationChanged={this.onOutputOrientationChanged}
        onPreviewOrientationChanged={this.onPreviewOrientationChanged}
        onError={this.onError}
        codeScannerOptions={codeScanner}
        enableFrameProcessor={frameProcessor != null}
        enableBufferCompression={props.enableBufferCompression ?? shouldEnableBufferCompression}
        preview={isRenderingWithSkia ? false : (props.preview ?? true)}>
        {isRenderingWithSkia && (
          <SkiaCameraCanvas
            style={styles.customPreviewView}
            offscreenTextures={frameProcessor.offscreenTextures}
            resizeMode={props.resizeMode}
          />
        )}
        {enableFpsGraph && (
          <FpsGraph style={styles.fpsGraph} averageFpsSamples={this.state.averageFpsSamples} targetMaxFps={props.format?.maxFps ?? 60} />
        )}
      </NativeCameraView>
    )
  }
}
//#endregion

const styles = StyleSheet.create({
  customPreviewView: {
    flex: 1,
  },
  fpsGraph: {
    elevation: 1,
    position: 'absolute',
    left: 15,
    top: 30,
  },
})