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

package org.schabi.newpipe.player.gesture

import android.os.Handler
import android.os.Looper
import android.util.Log
import android.view.GestureDetector
import android.view.MotionEvent
import android.view.View
import org.schabi.newpipe.databinding.PlayerBinding
import org.schabi.newpipe.player.Player
import org.schabi.newpipe.player.ui.VideoPlayerUi

/**
 * Base gesture handling for [Player]
 *
 * 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(
    private val playerUi: VideoPlayerUi,
) : GestureDetector.SimpleOnGestureListener(), View.OnTouchListener {

    protected val player: Player = playerUi.player
    protected val binding: PlayerBinding = playerUi.binding

    override fun onTouch(v: View, event: MotionEvent): Boolean {
        playerUi.gestureDetector.onTouchEvent(event)
        return false
    }

    private fun onDoubleTap(
        event: MotionEvent,
        portion: DisplayPortion
    ) {
        if (DEBUG) {
            Log.d(
                TAG,
                "onDoubleTap called with playerType = [" +
                    player.playerType + "], portion = [" + portion + "]"
            )
        }
        if (playerUi.isSomePopupMenuVisible) {
            playerUi.hideControls(0, 0)
        }
        if (portion === DisplayPortion.LEFT || portion === DisplayPortion.RIGHT) {
            startMultiDoubleTap(event)
        } else if (portion === DisplayPortion.MIDDLE) {
            player.playPause()
        }
    }

    protected fun onSingleTap() {
        if (playerUi.isControlsVisible) {
            playerUi.hideControls(150, 0)
            return
        }
        // -- Controls are not visible --

        // When player is completed show controls and don't hide them later
        if (player.currentState == Player.STATE_COMPLETED) {
            playerUi.showControls(0)
        } else {
            playerUi.showControlsThenHide()
        }
    }

    open fun onScrollEnd(event: MotionEvent) {
        if (DEBUG) {
            Log.d(
                TAG,
                "onScrollEnd called with playerType = [" +
                    player.playerType + "]"
            )
        }
        if (playerUi.isControlsVisible && player.currentState == Player.STATE_PLAYING) {
            playerUi.hideControls(
                VideoPlayerUi.DEFAULT_CONTROLS_DURATION,
                VideoPlayerUi.DEFAULT_CONTROLS_HIDE_TIME
            )
        }
    }

    // ///////////////////////////////////////////////////////////////////
    // 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
        }

        if (onDownNotDoubleTapping(e)) {
            return super.onDown(e)
        }
        return true
    }

    /**
     * @return true if `super.onDown(e)` should be called, false otherwise
     */
    open fun onDownNotDoubleTapping(e: MotionEvent): Boolean {
        return false // do not call super.onDown(e) by default, overridden for popup player
    }

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

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

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

    private var doubleTapControls: DoubleTapListener? = null

    private 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(Looper.getMainLooper())
    private val doubleTapRunnable = Runnable {
        if (DEBUG)
            Log.d(TAG, "doubleTapRunnable called")

        isDoubleTapping = false
        doubleTapControls?.onDoubleTapFinished()
    }

    private 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()
    }

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

    abstract fun getDisplayPortion(e: MotionEvent): DisplayPortion

    // Currently needed for scrolling since there is no action more the middle portion
    abstract fun getDisplayHalfPortion(e: MotionEvent): DisplayPortion

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

        private const val DOUBLE_TAP_DELAY = 550L
    }
}