package com.swmansion.gesturehandler

import android.app.Activity
import android.content.Context
import android.content.ContextWrapper
import android.graphics.PointF
import android.graphics.Rect
import android.view.MotionEvent
import android.view.MotionEvent.PointerCoords
import android.view.MotionEvent.PointerProperties
import android.view.View
import android.view.Window
import com.facebook.react.bridge.Arguments
import com.facebook.react.bridge.UiThreadUtil
import com.facebook.react.bridge.WritableArray
import com.facebook.react.uimanager.PixelUtil
import com.swmansion.gesturehandler.react.RNGestureHandlerTouchEvent
import java.lang.IllegalStateException
import java.util.*

open class GestureHandler<ConcreteGestureHandlerT : GestureHandler<ConcreteGestureHandlerT>> {
  private val trackedPointerIDs = IntArray(MAX_POINTERS_COUNT)
  private var trackedPointersIDsCount = 0
  private val windowOffset = IntArray(2) { 0 }
  var tag = 0
  var view: View? = null
    private set
  var state = STATE_UNDETERMINED
    private set
  var x = 0f
    private set
  var y = 0f
    private set
  var isWithinBounds = false
    private set
  var isEnabled = true
    private set
  var actionType = 0

  var changedTouchesPayload: WritableArray? = null
    private set
  var allTouchesPayload: WritableArray? = null
    private set
  var touchEventType = RNGestureHandlerTouchEvent.EVENT_UNDETERMINED
    private set
  var trackedPointersCount = 0
    private set
  private val trackedPointers: Array<PointerData?> = Array(MAX_POINTERS_COUNT) { null }
  var needsPointerData = false


  private var hitSlop: FloatArray? = null
  var eventCoalescingKey: Short = 0
    private set
  var lastAbsolutePositionX = 0f
    private set
  var lastAbsolutePositionY = 0f
    private set

  private var manualActivation = false

  private var lastEventOffsetX = 0f
  private var lastEventOffsetY = 0f
  private var shouldCancelWhenOutside = false
  var numberOfPointers = 0
    private set
  private var orchestrator: GestureHandlerOrchestrator? = null
  private var onTouchEventListener: OnTouchEventListener? = null
  private var interactionController: GestureHandlerInteractionController? = null

  @Suppress("UNCHECKED_CAST")
  protected fun self(): ConcreteGestureHandlerT = this as ConcreteGestureHandlerT

  protected inline fun applySelf(block: ConcreteGestureHandlerT.() -> Unit): ConcreteGestureHandlerT =
    self().apply { block() }

  // properties set and accessed only by the orchestrator
  var activationIndex = 0
  var isActive = false
  var isAwaiting = false
  var shouldResetProgress = false

  open fun dispatchStateChange(newState: Int, prevState: Int) {
    onTouchEventListener?.onStateChange(self(), newState, prevState)
  }

  open fun dispatchHandlerUpdate(event: MotionEvent) {
    onTouchEventListener?.onHandlerUpdate(self(), event)
  }

  open fun dispatchTouchEvent() {
    if (changedTouchesPayload != null) {
      onTouchEventListener?.onTouchEvent(self())
    }
  }

  open fun resetConfig() {
    needsPointerData = false
    manualActivation = false
    shouldCancelWhenOutside = false
    isEnabled = true
    hitSlop = null
  }

  fun hasCommonPointers(other: GestureHandler<*>): Boolean {
    for (i in trackedPointerIDs.indices) {
      if (trackedPointerIDs[i] != -1 && other.trackedPointerIDs[i] != -1) {
        return true
      }
    }
    return false
  }

  fun setShouldCancelWhenOutside(shouldCancelWhenOutside: Boolean): ConcreteGestureHandlerT =
    applySelf { this.shouldCancelWhenOutside = shouldCancelWhenOutside }

  fun setEnabled(enabled: Boolean): ConcreteGestureHandlerT = applySelf {
    // Don't cancel handler when not changing the value of the isEnabled, executing it always caused
    // handlers to be cancelled on re-render because that's the moment when the config is updated.
    // If the enabled prop "changed" from true to true the handler would get cancelled.
    if (view != null && isEnabled != enabled) {
      // If view is set then handler is in "active" state. In that case we want to "cancel" handler
      // when it changes enabled state so that it gets cleared from the orchestrator
      UiThreadUtil.runOnUiThread { cancel() }
    }
    isEnabled = enabled
  }

  fun setManualActivation(manualActivation: Boolean): ConcreteGestureHandlerT =
      applySelf { this.manualActivation = manualActivation }

  fun setHitSlop(
    leftPad: Float, topPad: Float, rightPad: Float, bottomPad: Float,
    width: Float, height: Float,
  ): ConcreteGestureHandlerT = applySelf {
    if (hitSlop == null) {
      hitSlop = FloatArray(6)
    }
    hitSlop!![HIT_SLOP_LEFT_IDX] = leftPad
    hitSlop!![HIT_SLOP_TOP_IDX] = topPad
    hitSlop!![HIT_SLOP_RIGHT_IDX] = rightPad
    hitSlop!![HIT_SLOP_BOTTOM_IDX] = bottomPad
    hitSlop!![HIT_SLOP_WIDTH_IDX] = width
    hitSlop!![HIT_SLOP_HEIGHT_IDX] = height
    require(!(hitSlopSet(width) && hitSlopSet(leftPad) && hitSlopSet(rightPad))) { "Cannot have all of left, right and width defined" }
    require(!(hitSlopSet(width) && !hitSlopSet(leftPad) && !hitSlopSet(rightPad))) { "When width is set one of left or right pads need to be defined" }
    require(!(hitSlopSet(height) && hitSlopSet(bottomPad) && hitSlopSet(topPad))) { "Cannot have all of top, bottom and height defined" }
    require(!(hitSlopSet(height) && !hitSlopSet(bottomPad) && !hitSlopSet(topPad))) { "When height is set one of top or bottom pads need to be defined" }
  }

  fun setHitSlop(padding: Float): ConcreteGestureHandlerT {
    return setHitSlop(padding, padding, padding, padding, HIT_SLOP_NONE, HIT_SLOP_NONE)
  }

  fun setInteractionController(controller: GestureHandlerInteractionController?): ConcreteGestureHandlerT =
    applySelf { interactionController = controller }

  fun prepare(view: View?, orchestrator: GestureHandlerOrchestrator?) {
    check(!(this.view != null || this.orchestrator != null)) { "Already prepared or hasn't been reset" }
    Arrays.fill(trackedPointerIDs, -1)
    trackedPointersIDsCount = 0
    state = STATE_UNDETERMINED
    this.view = view
    this.orchestrator = orchestrator

    val decorView = getWindow(view?.context)?.decorView
    if (decorView != null) {
      val frame = Rect()
      decorView.getWindowVisibleDisplayFrame(frame)
      windowOffset[0] = frame.left
      windowOffset[1] = frame.top
    } else {
      windowOffset[0] = 0
      windowOffset[1] = 0
    }

    onPrepare()
  }

  protected open fun onPrepare() {}

  private fun getWindow(context: Context?): Window? {
    if (context == null) return null
    if (context is Activity) return context.window
    if (context is ContextWrapper) return getWindow(context.baseContext)

    return null
  }

  private fun findNextLocalPointerId(): Int {
    var localPointerId = 0
    while (localPointerId < trackedPointersIDsCount) {
      var i = 0
      while (i < trackedPointerIDs.size) {
        if (trackedPointerIDs[i] == localPointerId) {
          break
        }
        i++
      }
      if (i == trackedPointerIDs.size) {
        return localPointerId
      }
      localPointerId++
    }
    return localPointerId
  }

  fun startTrackingPointer(pointerId: Int) {
    if (trackedPointerIDs[pointerId] == -1) {
      trackedPointerIDs[pointerId] = findNextLocalPointerId()
      trackedPointersIDsCount++
    }
  }

  fun stopTrackingPointer(pointerId: Int) {
    if (trackedPointerIDs[pointerId] != -1) {
      trackedPointerIDs[pointerId] = -1
      trackedPointersIDsCount--
    }
  }

  private fun needAdapt(event: MotionEvent): Boolean {
    if (event.pointerCount != trackedPointersIDsCount) {
      return true
    }

    for (i in trackedPointerIDs.indices) {
      val trackedPointer = trackedPointerIDs[i]
      if (trackedPointer != -1 && trackedPointer != i) {
        return true
      }
    }
    return false
  }

  private fun adaptEvent(event: MotionEvent): MotionEvent {
    if (!needAdapt(event)) {
      return event
    }
    var action = event.actionMasked
    var actionIndex = -1
    if (action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_POINTER_DOWN) {
      actionIndex = event.actionIndex
      val actionPointer = event.getPointerId(actionIndex)
      action = if (trackedPointerIDs[actionPointer] != -1) {
        if (trackedPointersIDsCount == 1) MotionEvent.ACTION_DOWN else MotionEvent.ACTION_POINTER_DOWN
      } else {
        MotionEvent.ACTION_MOVE
      }
    } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_POINTER_UP) {
      actionIndex = event.actionIndex
      val actionPointer = event.getPointerId(actionIndex)
      action = if (trackedPointerIDs[actionPointer] != -1) {
        if (trackedPointersIDsCount == 1) MotionEvent.ACTION_UP else MotionEvent.ACTION_POINTER_UP
      } else {
        MotionEvent.ACTION_MOVE
      }
    }
    initPointerProps(trackedPointersIDsCount)
    var count = 0
    val deltaX = event.rawX - event.x
    val deltaY = event.rawY - event.y
    event.offsetLocation(deltaX, deltaY)
    var index = 0
    val size = event.pointerCount
    while (index < size) {
      val origPointerId = event.getPointerId(index)
      if (trackedPointerIDs[origPointerId] != -1) {
        event.getPointerProperties(index, pointerProps[count])
        pointerProps[count]!!.id = trackedPointerIDs[origPointerId]
        event.getPointerCoords(index, pointerCoords[count])
        if (index == actionIndex) {
          action = action or (count shl MotionEvent.ACTION_POINTER_INDEX_SHIFT)
        }
        count++
      }
      index++
    }

    // introduced in 1.11.0, remove if crashes are not reported
    if(pointerProps.isEmpty()|| pointerCoords.isEmpty()){
      throw IllegalStateException("pointerCoords.size=${pointerCoords.size}, pointerProps.size=${pointerProps.size}")
    }

    val result: MotionEvent
    try {
      result = MotionEvent.obtain(
        event.downTime,
        event.eventTime,
        action,
        count,
        pointerProps,  /* props are copied and hence it is safe to use static array here */
        pointerCoords,  /* same applies to coords */
        event.metaState,
        event.buttonState,
        event.xPrecision,
        event.yPrecision,
        event.deviceId,
        event.edgeFlags,
        event.source,
        event.flags
      )
    } catch (e: IllegalArgumentException) {
      throw AdaptEventException(this, event, e)
    }
    event.offsetLocation(-deltaX, -deltaY)
    result.offsetLocation(-deltaX, -deltaY)
    return result
  }

  // exception to help debug https://github.com/software-mansion/react-native-gesture-handler/issues/1188
  class AdaptEventException(
    handler: GestureHandler<*>,
    event: MotionEvent,
    e: IllegalArgumentException
  ) : Exception("""
    handler: ${handler::class.simpleName}
    state: ${handler.state}
    view: ${handler.view}
    orchestrator: ${handler.orchestrator}
    isEnabled: ${handler.isEnabled}
    isActive: ${handler.isActive}
    isAwaiting: ${handler.isAwaiting}
    trackedPointersCount: ${handler.trackedPointersIDsCount}
    trackedPointers: ${handler.trackedPointerIDs.joinToString(separator = ", ")}
    while handling event: $event
  """.trimIndent(), e) {}

  fun handle(transformedEvent: MotionEvent, sourceEvent: MotionEvent) {
    if (!isEnabled
      || state == STATE_CANCELLED
      || state == STATE_FAILED
      || state == STATE_END
      || trackedPointersIDsCount < 1) {
      return
    }

    // a workaround for https://github.com/software-mansion/react-native-gesture-handler/issues/1188
    val (adaptedTransformedEvent, adaptedSourceEvent) = if (BuildConfig.DEBUG) {
      arrayOf(adaptEvent(transformedEvent), adaptEvent(sourceEvent))
    } else {
      try {
        arrayOf(adaptEvent(transformedEvent), adaptEvent(sourceEvent))
      } catch (e: AdaptEventException) {
        fail()
        return
      }
    }

    x = adaptedTransformedEvent.x
    y = adaptedTransformedEvent.y
    numberOfPointers = adaptedTransformedEvent.pointerCount
    isWithinBounds = isWithinBounds(view, x, y)
    if (shouldCancelWhenOutside && !isWithinBounds) {
      if (state == STATE_ACTIVE) {
        cancel()
      } else if (state == STATE_BEGAN) {
        fail()
      }
      return
    }
    lastAbsolutePositionX = GestureUtils.getLastPointerX(adaptedTransformedEvent, true)
    lastAbsolutePositionY = GestureUtils.getLastPointerY(adaptedTransformedEvent, true)
    lastEventOffsetX = adaptedTransformedEvent.rawX - adaptedTransformedEvent.x
    lastEventOffsetY = adaptedTransformedEvent.rawY - adaptedTransformedEvent.y
    onHandle(adaptedTransformedEvent, adaptedSourceEvent)
    if (adaptedTransformedEvent != transformedEvent) {
      adaptedTransformedEvent.recycle()
    }
    if (adaptedSourceEvent != sourceEvent) {
      adaptedSourceEvent.recycle()
    }
  }

  private fun dispatchTouchDownEvent(event: MotionEvent) {
    changedTouchesPayload = null
    touchEventType = RNGestureHandlerTouchEvent.EVENT_TOUCH_DOWN
    val pointerId = event.getPointerId(event.actionIndex)
    val offsetX = event.rawX - event.x
    val offsetY = event.rawY - event.y

    trackedPointers[pointerId] = PointerData(
        pointerId,
        event.getX(event.actionIndex),
        event.getY(event.actionIndex),
        event.getX(event.actionIndex) + offsetX - windowOffset[0],
        event.getY(event.actionIndex) + offsetY - windowOffset[1],
    )
    trackedPointersCount++
    addChangedPointer(trackedPointers[pointerId]!!)
    extractAllPointersData()

    dispatchTouchEvent()
  }

  private fun dispatchTouchUpEvent(event: MotionEvent) {
    extractAllPointersData()
    changedTouchesPayload = null
    touchEventType = RNGestureHandlerTouchEvent.EVENT_TOUCH_UP
    val pointerId = event.getPointerId(event.actionIndex)
    val offsetX = event.rawX - event.x
    val offsetY = event.rawY - event.y

    trackedPointers[pointerId] = PointerData(
        pointerId,
        event.getX(event.actionIndex),
        event.getY(event.actionIndex),
        event.getX(event.actionIndex) + offsetX - windowOffset[0],
        event.getY(event.actionIndex) + offsetY - windowOffset[1],
    )
    addChangedPointer(trackedPointers[pointerId]!!)
    trackedPointers[pointerId] = null
    trackedPointersCount--

    dispatchTouchEvent()
  }

  private fun dispatchTouchMoveEvent(event: MotionEvent) {
    changedTouchesPayload = null
    touchEventType = RNGestureHandlerTouchEvent.EVENT_TOUCH_MOVE
    val offsetX = event.rawX - event.x
    val offsetY = event.rawY - event.y
    var pointersAdded = 0

    for (i in 0 until event.pointerCount) {
      val pointerId = event.getPointerId(i)
      val pointer = trackedPointers[pointerId] ?: continue

      if (pointer.x != event.getX(i) || pointer.y != event.getY(i)) {
        pointer.x = event.getX(i)
        pointer.y = event.getY(i)
        pointer.absoluteX = event.getX(i) + offsetX - windowOffset[0]
        pointer.absoluteY = event.getY(i) + offsetY - windowOffset[1]

        addChangedPointer(pointer)
        pointersAdded++
      }
    }

    // only data about pointers that have changed their position is sent, it makes no sense to send
    // an empty move event (especially when this method is called during down/up event and there is
    // only info about one pointer)
    if (pointersAdded > 0) {
      extractAllPointersData()
      dispatchTouchEvent()
    }
  }

  fun updatePointerData(event: MotionEvent) {
    if (event.actionMasked == MotionEvent.ACTION_DOWN || event.actionMasked == MotionEvent.ACTION_POINTER_DOWN) {
      dispatchTouchDownEvent(event)
      dispatchTouchMoveEvent(event)
    } else if (event.actionMasked == MotionEvent.ACTION_UP || event.actionMasked == MotionEvent.ACTION_POINTER_UP) {
      dispatchTouchMoveEvent(event)
      dispatchTouchUpEvent(event)
    } else if (event.actionMasked == MotionEvent.ACTION_MOVE) {
      dispatchTouchMoveEvent(event)
    }
  }

  private fun extractAllPointersData() {
    allTouchesPayload = null

    for (pointerData in trackedPointers) {
      if (pointerData != null) {
        addPointerToAll(pointerData)
      }
    }
  }

  private fun cancelPointers() {
    touchEventType = RNGestureHandlerTouchEvent.EVENT_TOUCH_CANCELLED
    changedTouchesPayload = null
    extractAllPointersData()

    for (pointer in trackedPointers) {
      pointer?.let {
        addChangedPointer(it)
      }
    }

    trackedPointersCount = 0
    trackedPointers.fill(null)

    dispatchTouchEvent()
  }

  private fun addChangedPointer(pointerData: PointerData) {
    if (changedTouchesPayload == null) {
      changedTouchesPayload = Arguments.createArray()
    }

    changedTouchesPayload!!.pushMap(createPointerData(pointerData))
  }

  private fun addPointerToAll(pointerData: PointerData) {
    if (allTouchesPayload == null) {
      allTouchesPayload = Arguments.createArray()
    }

    allTouchesPayload!!.pushMap(createPointerData(pointerData))
  }

  private fun createPointerData(pointerData: PointerData) = Arguments.createMap().apply {
    putInt("id", pointerData.pointerId)
    putDouble("x", PixelUtil.toDIPFromPixel(pointerData.x).toDouble())
    putDouble("y", PixelUtil.toDIPFromPixel(pointerData.y).toDouble())
    putDouble("absoluteX", PixelUtil.toDIPFromPixel(pointerData.absoluteX).toDouble())
    putDouble("absoluteY", PixelUtil.toDIPFromPixel(pointerData.absoluteY).toDouble())
  }

  fun consumeChangedTouchesPayload(): WritableArray? {
    val result = changedTouchesPayload
    changedTouchesPayload = null
    return result
  }

  fun consumeAllTouchesPayload(): WritableArray? {
    val result = allTouchesPayload
    allTouchesPayload = null
    return result
  }

  private fun moveToState(newState: Int) {
    UiThreadUtil.assertOnUiThread()
    if (state == newState) {
      return
    }

    // if there are tracked pointers and the gesture is about to end, send event cancelling all pointers
    if (trackedPointersCount > 0 && (newState == STATE_END || newState == STATE_CANCELLED || newState == STATE_FAILED)) {
      cancelPointers()
    }

    val oldState = state
    state = newState
    if (state == STATE_ACTIVE) {
      // Generate a unique coalescing-key each time the gesture-handler becomes active. All events will have
      // the same coalescing-key allowing EventDispatcher to coalesce RNGestureHandlerEvents when events are
      // generated faster than they can be treated by JS thread
      eventCoalescingKey = nextEventCoalescingKey++
    }
    orchestrator!!.onHandlerStateChange(this, newState, oldState)
    onStateChange(newState, oldState)
  }

  fun wantEvents(): Boolean {
    return isEnabled
      && state != STATE_FAILED
      && state != STATE_CANCELLED
      && state != STATE_END
      && trackedPointersIDsCount > 0
  }

  open fun shouldRequireToWaitForFailure(handler: GestureHandler<*>): Boolean {
    if (handler === this) {
      return false
    }

    return interactionController?.shouldRequireHandlerToWaitForFailure(this, handler) ?: false
  }

  fun shouldWaitForHandlerFailure(handler: GestureHandler<*>): Boolean {
    if (handler === this) {
      return false
    }

    return interactionController?.shouldWaitForHandlerFailure(this, handler) ?: false
  }

  open fun shouldRecognizeSimultaneously(handler: GestureHandler<*>): Boolean {
    if (handler === this) {
      return true
    }

    return interactionController?.shouldRecognizeSimultaneously(this, handler) ?: false
  }

  open fun shouldBeCancelledBy(handler: GestureHandler<*>): Boolean {
    if (handler === this) {
      return false
    }

    return interactionController?.shouldHandlerBeCancelledBy(this, handler) ?: false
  }

  fun isWithinBounds(view: View?, posX: Float, posY: Float): Boolean {
    var left = 0f
    var top = 0f
    var right = view!!.width.toFloat()
    var bottom = view.height.toFloat()
    hitSlop?.let { hitSlop ->
      val padLeft = hitSlop[HIT_SLOP_LEFT_IDX]
      val padTop = hitSlop[HIT_SLOP_TOP_IDX]
      val padRight = hitSlop[HIT_SLOP_RIGHT_IDX]
      val padBottom = hitSlop[HIT_SLOP_BOTTOM_IDX]
      if (hitSlopSet(padLeft)) {
        left -= padLeft
      }
      if (hitSlopSet(padTop)) {
        top -= padTop
      }
      if (hitSlopSet(padRight)) {
        right += padRight
      }
      if (hitSlopSet(padBottom)) {
        bottom += padBottom
      }
      val width = hitSlop[HIT_SLOP_WIDTH_IDX]
      val height = hitSlop[HIT_SLOP_HEIGHT_IDX]
      if (hitSlopSet(width)) {
        if (!hitSlopSet(padLeft)) {
          left = right - width
        } else if (!hitSlopSet(padRight)) {
          right = left + width
        }
      }
      if (hitSlopSet(height)) {
        if (!hitSlopSet(padTop)) {
          top = bottom - height
        } else if (!hitSlopSet(padBottom)) {
          bottom = top + height
        }
      }
    }
    return posX in left..right && posY in top..bottom
  }

  fun cancel() {
    if (state == STATE_ACTIVE || state == STATE_UNDETERMINED || state == STATE_BEGAN) {
      onCancel()
      moveToState(STATE_CANCELLED)
    }
  }

  fun fail() {
    if (state == STATE_ACTIVE || state == STATE_UNDETERMINED || state == STATE_BEGAN) {
      moveToState(STATE_FAILED)
    }
  }

  fun activate() = activate(force = false)

  open fun activate(force: Boolean) {
    if ((!manualActivation || force) && (state == STATE_UNDETERMINED || state == STATE_BEGAN)) {
      moveToState(STATE_ACTIVE)
    }
  }

  fun begin() {
    if (state == STATE_UNDETERMINED) {
      moveToState(STATE_BEGAN)
    }
  }

  fun end() {
    if (state == STATE_BEGAN || state == STATE_ACTIVE) {
      moveToState(STATE_END)
    }
  }

  // responsible for resetting the state of handler upon activation (may be called more than once
  // if the handler is waiting for failure of other one)
  open fun resetProgress() {}

  protected open fun onHandle(event: MotionEvent, sourceEvent: MotionEvent) {
    moveToState(STATE_FAILED)
  }

  protected open fun onStateChange(newState: Int, previousState: Int) {}
  protected open fun onReset() {}
  protected open fun onCancel() {}

  /**
   * Transforms a point in the coordinate space of the wrapperView (GestureHandlerRootView) to
   * coordinate space of the view the gesture is attached to.
   *
   * If the gesture handler is not currently attached to a view, it will return (NaN, NaN).
   *
   * This method modifies and transforms the received point.
   */
  protected fun transformPoint(point: PointF): PointF {
    return orchestrator?.transformPointToViewCoords(this.view, point) ?: run {
      point.x = Float.NaN
      point.y = Float.NaN
      point
    }
  }
  fun reset() {
    view = null
    orchestrator = null
    Arrays.fill(trackedPointerIDs, -1)
    trackedPointersIDsCount = 0

    trackedPointersCount = 0
    trackedPointers.fill(null)
    touchEventType = RNGestureHandlerTouchEvent.EVENT_UNDETERMINED
    onReset()
  }

  fun setOnTouchEventListener(listener: OnTouchEventListener?): GestureHandler<*> {
    onTouchEventListener = listener
    return this
  }

  override fun toString(): String {
    val viewString = if (view == null) null else view!!.javaClass.simpleName
    return this.javaClass.simpleName + "@[" + tag + "]:" + viewString
  }

  val lastRelativePositionX: Float
    get() = lastAbsolutePositionX
  val lastRelativePositionY: Float
    get() = lastAbsolutePositionY

  val lastPositionInWindowX: Float
    get() = lastAbsolutePositionX + lastEventOffsetX - windowOffset[0]
  val lastPositionInWindowY: Float
    get() = lastAbsolutePositionY + lastEventOffsetY - windowOffset[1]

  companion object {
    const val STATE_UNDETERMINED = 0
    const val STATE_FAILED = 1
    const val STATE_BEGAN = 2
    const val STATE_CANCELLED = 3
    const val STATE_ACTIVE = 4
    const val STATE_END = 5
    const val HIT_SLOP_NONE = Float.NaN
    private const val HIT_SLOP_LEFT_IDX = 0
    private const val HIT_SLOP_TOP_IDX = 1
    private const val HIT_SLOP_RIGHT_IDX = 2
    private const val HIT_SLOP_BOTTOM_IDX = 3
    private const val HIT_SLOP_WIDTH_IDX = 4
    private const val HIT_SLOP_HEIGHT_IDX = 5
    const val DIRECTION_RIGHT = 1
    const val DIRECTION_LEFT = 2
    const val DIRECTION_UP = 4
    const val DIRECTION_DOWN = 8
    const val ACTION_TYPE_REANIMATED_WORKLET = 1
    const val ACTION_TYPE_NATIVE_ANIMATED_EVENT = 2
    const val ACTION_TYPE_JS_FUNCTION_OLD_API = 3
    const val ACTION_TYPE_JS_FUNCTION_NEW_API = 4
    private const val MAX_POINTERS_COUNT = 12
    private lateinit var pointerProps: Array<PointerProperties?>
    private lateinit var pointerCoords: Array<PointerCoords?>
    private fun initPointerProps(size: Int) {
      var size = size
      if (!::pointerProps.isInitialized) {
        pointerProps = arrayOfNulls(MAX_POINTERS_COUNT)
        pointerCoords = arrayOfNulls(MAX_POINTERS_COUNT)
      }
      while (size > 0 && pointerProps[size - 1] == null) {
        pointerProps[size - 1] = PointerProperties()
        pointerCoords[size - 1] = PointerCoords()
        size--
      }
    }

    private var nextEventCoalescingKey: Short = 0
    private fun hitSlopSet(value: Float): Boolean {
      return !java.lang.Float.isNaN(value)
    }

    fun stateToString(state: Int): String? {
      when (state) {
        STATE_UNDETERMINED -> return "UNDETERMINED"
        STATE_ACTIVE -> return "ACTIVE"
        STATE_FAILED -> return "FAILED"
        STATE_BEGAN -> return "BEGIN"
        STATE_CANCELLED -> return "CANCELLED"
        STATE_END -> return "END"
      }
      return null
    }
  }

  private data class PointerData(
    val pointerId: Int,
    var x: Float,
    var y: Float,
    var absoluteX: Float,
    var absoluteY: Float
  )
}