package com.reactnativekeyboardcontroller.views.overlay

import android.annotation.SuppressLint
import android.content.Context
import android.graphics.PixelFormat
import android.view.MotionEvent
import android.view.View
import android.view.WindowManager
import android.view.accessibility.AccessibilityEvent
import com.facebook.react.bridge.UiThreadUtil
import com.facebook.react.bridge.WritableMap
import com.facebook.react.bridge.WritableNativeMap
import com.facebook.react.config.ReactFeatureFlags
import com.facebook.react.uimanager.JSTouchDispatcher
import com.facebook.react.uimanager.StateWrapper
import com.facebook.react.uimanager.ThemedReactContext
import com.facebook.react.uimanager.UIManagerHelper
import com.facebook.react.uimanager.events.EventDispatcher
import com.facebook.react.views.view.ReactViewGroup
import com.reactnativekeyboardcontroller.extensions.dp
import com.reactnativekeyboardcontroller.extensions.getDisplaySize
import com.reactnativekeyboardcontroller.log.Logger

private val TAG = OverKeyboardHostView::class.qualifiedName

@SuppressLint("ViewConstructor")
class OverKeyboardHostView(
  private val reactContext: ThemedReactContext,
) : ReactViewGroup(reactContext) {
  private val dispatcher = UIManagerHelper.getEventDispatcherForReactTag(reactContext, this.id)
  private var windowManager: WindowManager = reactContext.getSystemService(Context.WINDOW_SERVICE) as WindowManager
  private var hostView: OverKeyboardRootViewGroup = OverKeyboardRootViewGroup(reactContext)

  var stateWrapper: StateWrapper?
    get() = hostView.stateWrapper
    set(stateWrapper) {
      hostView.stateWrapper = stateWrapper
    }

  init {
    hostView.eventDispatcher = dispatcher
  }

  // region life cycles
  override fun onDetachedFromWindow() {
    super.onDetachedFromWindow()

    hide()
  }

  override fun addView(
    child: View?,
    index: Int,
  ) {
    UiThreadUtil.assertOnUiThread()
    hostView.addView(child, index)
  }

  override fun getChildCount(): Int = hostView.childCount

  override fun getChildAt(index: Int): View? = hostView.getChildAt(index)

  override fun removeView(child: View?) {
    UiThreadUtil.assertOnUiThread()

    if (child != null) {
      hostView.removeView(child)
    }
  }

  override fun removeViewAt(index: Int) {
    UiThreadUtil.assertOnUiThread()
    val child = getChildAt(index)
    hostView.removeView(child)
  }

  override fun onLayout(
    changed: Boolean,
    l: Int,
    t: Int,
    r: Int,
    b: Int,
  ) {
    // Do nothing as we are laid out by UIManager
  }
  // endregion

  // region Accessibility
  override fun addChildrenForAccessibility(outChildren: ArrayList<View>) {
    // Don’t let Android try to reach children that are not actual descendants
  }

  // Explicitly override this to prevent accessibility events being passed down to children
  // Those will be handled by the `hostView` which lives in the `windowManager`
  override fun dispatchPopulateAccessibilityEvent(event: AccessibilityEvent): Boolean = false
  // endregion

  fun show() {
    val layoutParams =
      WindowManager.LayoutParams(
        WindowManager.LayoutParams.MATCH_PARENT,
        WindowManager.LayoutParams.MATCH_PARENT,
        // This type ensures it floats over other application windows but under system windows
        WindowManager.LayoutParams.TYPE_APPLICATION_PANEL,
        // Ensures touches outside the view pass through to other windows
        WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE or WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
        PixelFormat.TRANSLUCENT,
      )

    windowManager.addView(hostView, layoutParams)
  }

  fun hide() {
    if (hostView.isAttached) {
      windowManager.removeView(hostView)
    }
  }
}

@SuppressLint("ViewConstructor")
class OverKeyboardRootViewGroup(
  private val reactContext: ThemedReactContext,
) : ReactViewGroup(reactContext),
  RootViewCompat {
  private val jsTouchDispatcher: JSTouchDispatcher = JSTouchDispatcher(this)
  private var jsPointerDispatcher: JSPointerDispatcherCompat? = null
  internal var eventDispatcher: EventDispatcher? = null
  internal var stateWrapper: StateWrapper? = null
  internal var isAttached = false

  init {
    if (ReactFeatureFlags.dispatchPointerEvents) {
      jsPointerDispatcher = JSPointerDispatcherCompat(this)
    }
  }

  // region life cycles
  override fun onAttachedToWindow() {
    super.onAttachedToWindow()
    val displaySize = reactContext.getDisplaySize()
    stretchTo(width = displaySize.x, height = displaySize.y)
    isAttached = true
  }

  override fun onDetachedFromWindow() {
    super.onDetachedFromWindow()
    stretchTo(width = 0, height = 0)
    isAttached = false
  }

  override fun onSizeChanged(
    width: Int,
    height: Int,
    oldWidth: Int,
    oldHeight: Int,
  ) {
    super.onSizeChanged(width, height, oldWidth, oldHeight)
    stretchTo(width, height)
  }

  // endregion

  // region Touch events handling
  override fun onInterceptTouchEvent(event: MotionEvent): Boolean {
    eventDispatcher?.let { eventDispatcher ->
      try {
        jsTouchDispatcher.handleTouchEvent(event, eventDispatcher)
        jsPointerDispatcher?.handleMotionEventCompat(event, eventDispatcher, true)
      } catch (
        @Suppress("detekt:TooGenericExceptionCaught") e: RuntimeException,
      ) {
        Logger.w(TAG, "Can not handle touch event", e)
      }
    }
    return super.onInterceptTouchEvent(event)
  }

  @SuppressLint("ClickableViewAccessibility")
  override fun onTouchEvent(event: MotionEvent): Boolean {
    eventDispatcher?.let { eventDispatcher ->
      try {
        jsTouchDispatcher.handleTouchEvent(event, eventDispatcher)
        jsPointerDispatcher?.handleMotionEventCompat(event, eventDispatcher, false)
      } catch (
        @Suppress("detekt:TooGenericExceptionCaught") e: RuntimeException,
      ) {
        Logger.w(TAG, "Can not handle touch event", e)
      }
    }
    super.onTouchEvent(event)
    // In case when there is no children interested in handling touch event, we return true from
    // the root view in order to receive subsequent events related to that gesture
    return true
  }

  override fun onInterceptHoverEvent(event: MotionEvent): Boolean {
    eventDispatcher?.let {
      jsPointerDispatcher?.handleMotionEventCompat(event, it, true)
    }
    return super.onInterceptHoverEvent(event)
  }

  override fun onHoverEvent(event: MotionEvent): Boolean {
    eventDispatcher?.let {
      jsPointerDispatcher?.handleMotionEventCompat(event, it, false)
    }
    return super.onHoverEvent(event)
  }

  override fun requestDisallowInterceptTouchEvent(disallowIntercept: Boolean) {
    // No-op - override in order to still receive events to onInterceptTouchEvent
    // even when some other view disallow that
  }
  // endregion

  // region RootView methods
  override fun onChildStartedNativeGesture(
    childView: View?,
    ev: MotionEvent,
  ) {
    eventDispatcher?.let { eventDispatcher ->
      jsTouchDispatcher.onChildStartedNativeGesture(ev, eventDispatcher)
      jsPointerDispatcher?.onChildStartedNativeGesture(childView, ev, eventDispatcher)
    }
  }

  override fun onChildEndedNativeGesture(
    childView: View,
    ev: MotionEvent,
  ) {
    eventDispatcher?.let { jsTouchDispatcher.onChildEndedNativeGesture(ev, it) }
    jsPointerDispatcher?.onChildEndedNativeGesture()
  }

  override fun handleException(t: Throwable) {
    reactContext.reactApplicationContext.handleException(RuntimeException(t))
  }
  // endregion

  private fun stretchTo(
    width: Int,
    height: Int,
  ) {
    val newStateData: WritableMap = WritableNativeMap()
    newStateData.putDouble("screenWidth", width.toFloat().dp)
    newStateData.putDouble("screenHeight", height.toFloat().dp)
    stateWrapper?.updateState(newStateData)
  }
}