NewPipe/app/src/main/java/org/schabi/newpipe/player/event/BasePlayerGestureListener.kt

package org.schabi.newpipe.player.event

import android.content.Context
import android.os.Handler
import android.util.Log
import android.view.GestureDetector
import android.view.MotionEvent
import android.view.View
import android.view.ViewConfiguration
import org.schabi.newpipe.player.BasePlayer
import org.schabi.newpipe.player.MainPlayer
import org.schabi.newpipe.player.VideoPlayerImpl
import org.schabi.newpipe.player.helper.PlayerHelper
import org.schabi.newpipe.util.AnimationUtils
import kotlin.math.abs
import kotlin.math.hypot
import kotlin.math.max

/**
 * Base gesture handling for [VideoPlayerImpl]
 *
 * This class contains the logic for the player gestures like View preparations
 * and provides some abstract methods to make it easier separating the logic from the UI.
 */
abstract class BasePlayerGestureListener(
    @JvmField
    protected val playerImpl: VideoPlayerImpl,
    @JvmField
    protected val service: MainPlayer
) : GestureDetector.SimpleOnGestureListener(), View.OnTouchListener {

    // ///////////////////////////////////////////////////////////////////
    // Abstract methods for VIDEO and POPUP
    // ///////////////////////////////////////////////////////////////////

    abstract fun onDoubleTap(event: MotionEvent, portion: DisplayPortion)

    abstract fun onSingleTap(playerType: MainPlayer.PlayerType)

    abstract fun onScroll(
        playerType: MainPlayer.PlayerType,
        portion: DisplayPortion,
        initialEvent: MotionEvent,
        movingEvent: MotionEvent,
        distanceX: Float,
        distanceY: Float
    )

    abstract fun onScrollEnd(playerType: MainPlayer.PlayerType, event: MotionEvent)

    // ///////////////////////////////////////////////////////////////////
    // Abstract methods for POPUP (exclusive)
    // ///////////////////////////////////////////////////////////////////

    abstract fun onPopupResizingStart()

    abstract fun onPopupResizingEnd()

    private var initialPopupX: Int = -1
    private var initialPopupY: Int = -1

    private var isMovingInMain = false
    private var isMovingInPopup = false
    private var isResizing = false

    private val tossFlingVelocity = PlayerHelper.getTossFlingVelocity()

    // [popup] initial coordinates and distance between fingers
    private var initPointerDistance = -1.0
    private var initFirstPointerX = -1f
    private var initFirstPointerY = -1f
    private var initSecPointerX = -1f
    private var initSecPointerY = -1f

    // ///////////////////////////////////////////////////////////////////
    // onTouch implementation
    // ///////////////////////////////////////////////////////////////////

    override fun onTouch(v: View, event: MotionEvent): Boolean {
        return if (playerImpl.popupPlayerSelected()) {
            onTouchInPopup(v, event)
        } else {
            onTouchInMain(v, event)
        }
    }

    private fun onTouchInMain(v: View, event: MotionEvent): Boolean {
        playerImpl.gestureDetector.onTouchEvent(event)
        if (event.action == MotionEvent.ACTION_UP && isMovingInMain) {
            isMovingInMain = false
            onScrollEnd(MainPlayer.PlayerType.VIDEO, event)
        }
        return when (event.action) {
            MotionEvent.ACTION_DOWN, MotionEvent.ACTION_MOVE -> {
                v.parent.requestDisallowInterceptTouchEvent(playerImpl.isFullscreen)
                true
            }
            MotionEvent.ACTION_UP -> {
                v.parent.requestDisallowInterceptTouchEvent(false)
                false
            }
            else -> true
        }
    }

    private fun onTouchInPopup(v: View, event: MotionEvent): Boolean {
        playerImpl.gestureDetector.onTouchEvent(event)
        if (event.pointerCount == 2 && !isMovingInPopup && !isResizing) {
            if (DEBUG) {
                Log.d(TAG, "onTouch() 2 finger pointer detected, enabling resizing.")
            }
            onPopupResizingStart()

            // record coordinates of fingers
            initFirstPointerX = event.getX(0)
            initFirstPointerY = event.getY(0)
            initSecPointerX = event.getX(1)
            initSecPointerY = event.getY(1)
            // record distance between fingers
            initPointerDistance = Math.hypot(initFirstPointerX - initSecPointerX.toDouble(),
                initFirstPointerY - initSecPointerY.toDouble())

            isResizing = true
        }
        if (event.action == MotionEvent.ACTION_MOVE && !isMovingInPopup && isResizing) {
            if (DEBUG) {
                Log.d(TAG, "onTouch() ACTION_MOVE > v = [$v], e1.getRaw = [${event.rawX}" +
                    ", ${event.rawY}]")
            }
            return handleMultiDrag(event)
        }
        if (event.action == MotionEvent.ACTION_UP) {
            if (DEBUG) {
                Log.d(TAG, "onTouch() ACTION_UP > v = [$v], e1.getRaw = [${event.rawX}" +
                    ", ${event.rawY}]")
            }
            if (isMovingInPopup) {
                isMovingInPopup = false
                onScrollEnd(MainPlayer.PlayerType.POPUP, event)
            }
            if (isResizing) {
                isResizing = false

                initPointerDistance = (-1).toDouble()
                initFirstPointerX = (-1).toFloat()
                initFirstPointerY = (-1).toFloat()
                initSecPointerX = (-1).toFloat()
                initSecPointerY = (-1).toFloat()

                onPopupResizingEnd()
                playerImpl.changeState(playerImpl.currentState)
            }
            if (!playerImpl.isPopupClosing) {
                playerImpl.savePositionAndSize()
            }
        }

        v.performClick()
        return true
    }

    private fun handleMultiDrag(event: MotionEvent): Boolean {
        if (initPointerDistance != -1.0 && event.pointerCount == 2) {
            // get the movements of the fingers
            val firstPointerMove = hypot(event.getX(0) - initFirstPointerX.toDouble(),
                event.getY(0) - initFirstPointerY.toDouble())
            val secPointerMove = hypot(event.getX(1) - initSecPointerX.toDouble(),
                event.getY(1) - initSecPointerY.toDouble())

            // minimum threshold beyond which pinch gesture will work
            val minimumMove = ViewConfiguration.get(service).scaledTouchSlop

            if (max(firstPointerMove, secPointerMove) > minimumMove) {
                // calculate current distance between the pointers
                val currentPointerDistance = hypot(event.getX(0) - event.getX(1).toDouble(),
                    event.getY(0) - event.getY(1).toDouble())

                val popupWidth = playerImpl.popupWidth.toDouble()
                // change co-ordinates of popup so the center stays at the same position
                val newWidth = popupWidth * currentPointerDistance / initPointerDistance
                initPointerDistance = currentPointerDistance
                playerImpl.popupLayoutParams.x += ((popupWidth - newWidth) / 2.0).toInt()

                playerImpl.checkPopupPositionBounds()
                playerImpl.updateScreenSize()

                playerImpl.updatePopupSize(
                    Math.min(playerImpl.screenWidth.toDouble(), newWidth).toInt(),
                    -1)
                return true
            }
        }
        return false
    }

    // ///////////////////////////////////////////////////////////////////
    // Simple gestures
    // ///////////////////////////////////////////////////////////////////

    override fun onDown(e: MotionEvent): Boolean {
        if (DEBUG)
            Log.d(TAG, "onDown called with e = [$e]")

        if (isDoubleTapping && isDoubleTapEnabled) {
            doubleTapControls?.onDoubleTapProgressDown(getDisplayPortion(e))
            return true
        }

        return if (playerImpl.popupPlayerSelected())
            onDownInPopup(e)
        else
            true
    }

    private fun onDownInPopup(e: MotionEvent): Boolean {
        // Fix popup position when the user touch it, it may have the wrong one
        // because the soft input is visible (the draggable area is currently resized).
        playerImpl.updateScreenSize()
        playerImpl.checkPopupPositionBounds()
        initialPopupX = playerImpl.popupLayoutParams.x
        initialPopupY = playerImpl.popupLayoutParams.y
        playerImpl.popupWidth = playerImpl.popupLayoutParams.width.toFloat()
        playerImpl.popupHeight = playerImpl.popupLayoutParams.height.toFloat()
        return super.onDown(e)
    }

    override fun onDoubleTap(e: MotionEvent): Boolean {
        if (DEBUG)
            Log.d(TAG, "onDoubleTap called with e = [$e]")

        onDoubleTap(e, getDisplayPortion(e))
        return true
    }

    override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
        if (DEBUG)
            Log.d(TAG, "onSingleTapConfirmed() called with: e = [$e]")

        if (isDoubleTapping)
            return true

        if (playerImpl.popupPlayerSelected()) {
            if (playerImpl.player == null)
                return false

            onSingleTap(MainPlayer.PlayerType.POPUP)
            return true
        } else {
            super.onSingleTapConfirmed(e)
            if (playerImpl.currentState == BasePlayer.STATE_BLOCKED)
                return true

            onSingleTap(MainPlayer.PlayerType.VIDEO)
        }
        return true
    }

    override fun onLongPress(e: MotionEvent?) {
        if (playerImpl.popupPlayerSelected()) {
            playerImpl.updateScreenSize()
            playerImpl.checkPopupPositionBounds()
            playerImpl.updatePopupSize(playerImpl.screenWidth.toInt(), -1)
        }
    }

    override fun onScroll(
        initialEvent: MotionEvent,
        movingEvent: MotionEvent,
        distanceX: Float,
        distanceY: Float
    ): Boolean {
        return if (playerImpl.popupPlayerSelected()) {
            onScrollInPopup(initialEvent, movingEvent, distanceX, distanceY)
        } else {
            onScrollInMain(initialEvent, movingEvent, distanceX, distanceY)
        }
    }

    override fun onFling(
        e1: MotionEvent?,
        e2: MotionEvent?,
        velocityX: Float,
        velocityY: Float
    ): Boolean {
        return if (playerImpl.popupPlayerSelected()) {
            val absVelocityX = abs(velocityX)
            val absVelocityY = abs(velocityY)
            if (absVelocityX.coerceAtLeast(absVelocityY) > tossFlingVelocity) {
                if (absVelocityX > tossFlingVelocity) {
                    playerImpl.popupLayoutParams.x = velocityX.toInt()
                }
                if (absVelocityY > tossFlingVelocity) {
                    playerImpl.popupLayoutParams.y = velocityY.toInt()
                }
                playerImpl.checkPopupPositionBounds()
                playerImpl.windowManager
                    .updateViewLayout(playerImpl.rootView, playerImpl.popupLayoutParams)
                return true
            }
            return false
        } else {
            true
        }
    }

    private fun onScrollInMain(
        initialEvent: MotionEvent,
        movingEvent: MotionEvent,
        distanceX: Float,
        distanceY: Float
    ): Boolean {

        if (!playerImpl.isFullscreen) {
            return false
        }

        val isTouchingStatusBar: Boolean = initialEvent.y < getStatusBarHeight(service)
        val isTouchingNavigationBar: Boolean = (initialEvent.y
            > playerImpl.rootView.height - getNavigationBarHeight(service))
        if (isTouchingStatusBar || isTouchingNavigationBar) {
            return false
        }

        val insideThreshold = abs(movingEvent.y - initialEvent.y) <= MOVEMENT_THRESHOLD
        if (!isMovingInMain && (insideThreshold || abs(distanceX) > abs(distanceY)) ||
            playerImpl.currentState == BasePlayer.STATE_COMPLETED) {
            return false
        }

        isMovingInMain = true

        onScroll(MainPlayer.PlayerType.VIDEO, getDisplayHalfPortion(initialEvent),
            initialEvent, movingEvent, distanceX, distanceY)

        return true
    }

    private fun onScrollInPopup(
        initialEvent: MotionEvent,
        movingEvent: MotionEvent,
        distanceX: Float,
        distanceY: Float
    ): Boolean {

        if (isResizing) {
            return super.onScroll(initialEvent, movingEvent, distanceX, distanceY)
        }

        if (!isMovingInPopup) {
            AnimationUtils.animateView(playerImpl.closeOverlayButton, true, 200)
        }

        isMovingInPopup = true

        val diffX: Float = (movingEvent.rawX - initialEvent.rawX)
        var posX: Float = (initialPopupX + diffX)
        val diffY: Float = (movingEvent.rawY - initialEvent.rawY)
        var posY: Float = (initialPopupY + diffY)

        if (posX > playerImpl.screenWidth - playerImpl.popupWidth) {
            posX = (playerImpl.screenWidth - playerImpl.popupWidth)
        } else if (posX < 0) {
            posX = 0f
        }

        if (posY > playerImpl.screenHeight - playerImpl.popupHeight) {
            posY = (playerImpl.screenHeight - playerImpl.popupHeight)
        } else if (posY < 0) {
            posY = 0f
        }

        playerImpl.popupLayoutParams.x = posX.toInt()
        playerImpl.popupLayoutParams.y = posY.toInt()

        onScroll(MainPlayer.PlayerType.POPUP, getDisplayHalfPortion(initialEvent),
            initialEvent, movingEvent, distanceX, distanceY)

        playerImpl.windowManager
            .updateViewLayout(playerImpl.rootView, playerImpl.popupLayoutParams)
        return true
    }

    // ///////////////////////////////////////////////////////////////////
    // Multi double tapping
    // ///////////////////////////////////////////////////////////////////

    var doubleTapControls: DoubleTapListener? = null
        private set

    val isDoubleTapEnabled: Boolean
        get() = doubleTapDelay > 0

    var isDoubleTapping = false
        private set

    fun doubleTapControls(listener: DoubleTapListener) = apply {
        doubleTapControls = listener
    }

    private var doubleTapDelay = DOUBLE_TAP_DELAY
    private val doubleTapHandler: Handler = Handler()
    private val doubleTapRunnable = Runnable {
        if (DEBUG)
            Log.d(TAG, "doubleTapRunnable called")

        isDoubleTapping = false
        doubleTapControls?.onDoubleTapFinished()
    }

    fun startMultiDoubleTap(e: MotionEvent) {
        if (!isDoubleTapping) {
            if (DEBUG)
                Log.d(TAG, "startMultiDoubleTap called with e = [$e]")

            keepInDoubleTapMode()
            doubleTapControls?.onDoubleTapStarted(getDisplayPortion(e))
        }
    }

    fun keepInDoubleTapMode() {
        if (DEBUG)
            Log.d(TAG, "keepInDoubleTapMode called")

        isDoubleTapping = true
        doubleTapHandler.removeCallbacks(doubleTapRunnable)
        doubleTapHandler.postDelayed(doubleTapRunnable, doubleTapDelay)
    }

    fun endMultiDoubleTap() {
        if (DEBUG)
            Log.d(TAG, "endMultiDoubleTap called")

        isDoubleTapping = false
        doubleTapHandler.removeCallbacks(doubleTapRunnable)
        doubleTapControls?.onDoubleTapFinished()
    }

    fun enableMultiDoubleTap(enable: Boolean) = apply {
        doubleTapDelay = if (enable) DOUBLE_TAP_DELAY else 0
    }

    // ///////////////////////////////////////////////////////////////////
    // Utils
    // ///////////////////////////////////////////////////////////////////

    private fun getDisplayPortion(e: MotionEvent): DisplayPortion {
        return if (playerImpl.playerType == MainPlayer.PlayerType.POPUP) {
            when {
                e.x < playerImpl.popupWidth / 3.0 -> DisplayPortion.LEFT
                e.x > playerImpl.popupWidth * 2.0 / 3.0 -> DisplayPortion.RIGHT
                else -> DisplayPortion.MIDDLE
            }
        } else /* MainPlayer.PlayerType.VIDEO */ {
            when {
                e.x < playerImpl.rootView.width / 3.0 -> DisplayPortion.LEFT
                e.x > playerImpl.rootView.width * 2.0 / 3.0 -> DisplayPortion.RIGHT
                else -> DisplayPortion.MIDDLE
            }
        }
    }

    // Currently needed for scrolling since there is no action more the middle portion
    private fun getDisplayHalfPortion(e: MotionEvent): DisplayPortion {
        return if (playerImpl.playerType == MainPlayer.PlayerType.POPUP) {
            when {
                e.x < playerImpl.popupWidth / 2.0 -> DisplayPortion.LEFT_HALF
                else -> DisplayPortion.RIGHT_HALF
            }
        } else /* MainPlayer.PlayerType.VIDEO */ {
            when {
                e.x < playerImpl.rootView.width / 2.0 -> DisplayPortion.LEFT_HALF
                else -> DisplayPortion.RIGHT_HALF
            }
        }
    }

    private fun getNavigationBarHeight(context: Context): Int {
        val resId = context.resources
            .getIdentifier("navigation_bar_height", "dimen", "android")
        return if (resId > 0) {
            context.resources.getDimensionPixelSize(resId)
        } else 0
    }

    private fun getStatusBarHeight(context: Context): Int {
        val resId = context.resources
            .getIdentifier("status_bar_height", "dimen", "android")
        return if (resId > 0) {
            context.resources.getDimensionPixelSize(resId)
        } else 0
    }

    companion object {
        private const val TAG = "BasePlayerGestListener"
        private val DEBUG = BasePlayer.DEBUG

        private const val DOUBLE_TAP_DELAY = 550L
        private const val MOVEMENT_THRESHOLD = 40
    }
}