LibreTube/app/src/main/java/com/github/libretube/fragments/PlayerFragment.kt

package com.github.libretube.fragments

import android.annotation.SuppressLint
import android.app.NotificationManager
import android.app.PictureInPictureParams
import android.content.Context
import android.content.Intent
import android.content.pm.ActivityInfo
import android.graphics.Rect
import android.net.Uri
import android.os.Build
import android.os.Build.VERSION.SDK_INT
import android.os.Bundle
import android.os.PowerManager
import android.support.v4.media.session.MediaSessionCompat
import android.text.Html
import android.text.TextUtils
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.FrameLayout
import android.widget.ImageButton
import android.widget.ImageView
import android.widget.LinearLayout
import android.widget.RelativeLayout
import android.widget.ScrollView
import android.widget.TextView
import android.widget.Toast
import androidx.constraintlayout.motion.widget.MotionLayout
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.core.net.toUri
import androidx.core.os.bundleOf
import androidx.core.view.isVisible
import androidx.fragment.app.Fragment
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.github.libretube.MainActivity
import com.github.libretube.R
import com.github.libretube.adapters.ChaptersAdapter
import com.github.libretube.adapters.CommentsAdapter
import com.github.libretube.adapters.TrendingAdapter
import com.github.libretube.dialogs.AddtoPlaylistDialog
import com.github.libretube.dialogs.DownloadDialog
import com.github.libretube.dialogs.ShareDialog
import com.github.libretube.hideKeyboard
import com.github.libretube.obj.ChapterSegment
import com.github.libretube.obj.PipedStream
import com.github.libretube.obj.Playlist
import com.github.libretube.obj.Segment
import com.github.libretube.obj.Segments
import com.github.libretube.obj.SponsorBlockPrefs
import com.github.libretube.obj.StreamItem
import com.github.libretube.obj.Streams
import com.github.libretube.obj.Subscribe
import com.github.libretube.services.IS_DOWNLOAD_RUNNING
import com.github.libretube.util.CronetHelper
import com.github.libretube.util.DescriptionAdapter
import com.github.libretube.util.PreferenceHelper
import com.github.libretube.util.RetrofitInstance
import com.github.libretube.util.formatShort
import com.google.android.exoplayer2.C
import com.google.android.exoplayer2.DefaultLoadControl
import com.google.android.exoplayer2.ExoPlayer
import com.google.android.exoplayer2.MediaItem
import com.google.android.exoplayer2.MediaItem.SubtitleConfiguration
import com.google.android.exoplayer2.MediaItem.fromUri
import com.google.android.exoplayer2.Player
import com.google.android.exoplayer2.audio.AudioAttributes
import com.google.android.exoplayer2.ext.cronet.CronetDataSource
import com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector
import com.google.android.exoplayer2.source.DefaultMediaSourceFactory
import com.google.android.exoplayer2.source.MediaSource
import com.google.android.exoplayer2.source.MergingMediaSource
import com.google.android.exoplayer2.source.ProgressiveMediaSource
import com.google.android.exoplayer2.ui.AspectRatioFrameLayout
import com.google.android.exoplayer2.ui.PlayerNotificationManager
import com.google.android.exoplayer2.ui.StyledPlayerView
import com.google.android.exoplayer2.upstream.DataSource
import com.google.android.exoplayer2.upstream.DefaultDataSource
import com.google.android.exoplayer2.upstream.DefaultHttpDataSource
import com.google.android.exoplayer2.util.RepeatModeUtil
import com.google.android.material.button.MaterialButton
import com.google.android.material.card.MaterialCardView
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import com.squareup.picasso.Picasso
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import org.chromium.net.CronetEngine
import retrofit2.HttpException
import java.io.IOException
import java.util.concurrent.Executors
import kotlin.math.abs

var isFullScreen = false
var isMiniPlayerVisible = false

class PlayerFragment : Fragment() {

    private val TAG = "PlayerFragment"
    private var videoId: String? = null
    private var playlistId: String? = null
    private var sId: Int = 0
    private var eId: Int = 0
    private var paused = false
    private var whichQuality = 0
    private var transitioning = false
    private var autoplay = false
    private var isZoomed: Boolean = false

    private var isSubscribed: Boolean = false

    private lateinit var relatedRecView: RecyclerView
    private lateinit var commentsRecView: RecyclerView
    private var commentsAdapter: CommentsAdapter? = null
    private var commentsLoaded: Boolean? = false
    private var nextPage: String? = null
    private var isLoading = true
    private lateinit var exoPlayerView: StyledPlayerView
    private lateinit var motionLayout: MotionLayout
    private lateinit var exoPlayer: ExoPlayer
    private lateinit var segmentData: Segments
    private var relatedStreamsEnabled = true

    private var relatedStreams: List<StreamItem>? = arrayListOf()
    private var nextStreamId: String? = null
    private var playlistStreamIds: MutableList<String> = arrayListOf()
    private var playlistNextPage: String? = null

    private var isPlayerLocked: Boolean = false

    private lateinit var relDownloadVideo: LinearLayout

    private lateinit var mediaSession: MediaSessionCompat
    private lateinit var mediaSessionConnector: MediaSessionConnector
    private lateinit var playerNotification: PlayerNotificationManager

    private lateinit var title: String
    private lateinit var uploader: String
    private lateinit var thumbnailUrl: String
    private val sponsorBlockPrefs = SponsorBlockPrefs()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        arguments?.let {
            videoId = it.getString("videoId")
            playlistId = it.getString("playlistId")
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_player, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        hideKeyboard()

        setSponsorBlockPrefs()
        initializeTransitionLayout(view)
        fetchJsonAndInitPlayer(view)
    }

    private fun initializeTransitionLayout(view: View) {
        val playerDescription = view.findViewById<TextView>(R.id.player_description)
        videoId = videoId!!.replace("/watch?v=", "")
        relDownloadVideo = view.findViewById(R.id.relPlayer_download)
        val mainActivity = activity as MainActivity
        mainActivity.findViewById<FrameLayout>(R.id.container).visibility = View.VISIBLE
        val playerMotionLayout = view.findViewById<MotionLayout>(R.id.playerMotionLayout)
        motionLayout = playerMotionLayout
        exoPlayerView = view.findViewById(R.id.player)

        view.findViewById<TextView>(R.id.player_description).text = videoId
        playerMotionLayout.addTransitionListener(object : MotionLayout.TransitionListener {
            override fun onTransitionStarted(
                motionLayout: MotionLayout?,
                startId: Int,
                endId: Int
            ) {
            }

            override fun onTransitionChange(
                motionLayout: MotionLayout?,
                startId: Int,
                endId: Int,
                progress: Float
            ) {
                val mainActivity = activity as MainActivity
                val mainMotionLayout =
                    mainActivity.findViewById<MotionLayout>(R.id.mainMotionLayout)
                mainMotionLayout.progress = abs(progress)
                exoPlayerView.hideController()
                eId = endId
                sId = startId
            }

            override fun onTransitionCompleted(motionLayout: MotionLayout?, currentId: Int) {
                println(currentId)
                val mainActivity = activity as MainActivity
                val mainMotionLayout =
                    mainActivity.findViewById<MotionLayout>(R.id.mainMotionLayout)
                if (currentId == eId) {
                    isMiniPlayerVisible = true
                    exoPlayerView.useController = false
                    mainMotionLayout.progress = 1F
                } else if (currentId == sId) {
                    isMiniPlayerVisible = false
                    exoPlayerView.useController = true
                    mainMotionLayout.progress = 0F
                }
            }

            override fun onTransitionTrigger(
                motionLayout: MotionLayout?,
                triggerId: Int,
                positive: Boolean,
                progress: Float
            ) {
            }
        })

        playerMotionLayout.progress = 1.toFloat()
        playerMotionLayout.transitionToStart()

        view.findViewById<ImageView>(R.id.close_imageView).setOnClickListener {
            isMiniPlayerVisible = false
            motionLayout.transitionToEnd()
            val mainActivity = activity as MainActivity
            mainActivity.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT
            mainActivity.supportFragmentManager.beginTransaction()
                .remove(this)
                .commit()
        }
        view.findViewById<ImageButton>(R.id.close_imageButton).setOnClickListener {
            isMiniPlayerVisible = false
            motionLayout.transitionToEnd()
            val mainActivity = activity as MainActivity
            mainActivity.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT
            mainActivity.supportFragmentManager.beginTransaction()
                .remove(this)
                .commit()
        }
        val playImageView = view.findViewById<ImageView>(R.id.play_imageView)
        playImageView.setOnClickListener {
            paused = if (paused) {
                playImageView.setImageResource(R.drawable.ic_pause)
                exoPlayer.play()
                false
            } else {
                playImageView.setImageResource(R.drawable.ic_play)
                exoPlayer.pause()
                true
            }
        }

        // video description and chapters toggle
        val descLinLayout = view.findViewById<LinearLayout>(R.id.desc_linLayout)
        view.findViewById<RelativeLayout>(R.id.player_title_layout).setOnClickListener {
            val arrowImageView = view.findViewById<ImageView>(R.id.player_description_arrow)
            arrowImageView.animate().rotationBy(180F).setDuration(100).start()
            descLinLayout.visibility = if (descLinLayout.isVisible) View.GONE else View.VISIBLE
        }

        view.findViewById<MaterialCardView>(R.id.comments_toggle)
            .setOnClickListener {
                toggleComments()
            }

        val fullScreenButton = view.findViewById<ImageButton>(R.id.fullscreen)
        val exoTitle = view.findViewById<TextView>(R.id.exo_title)
        val mainContainer = view.findViewById<ConstraintLayout>(R.id.main_container)
        val linLayout = view.findViewById<LinearLayout>(R.id.linLayout)

        // FullScreen button trigger
        fullScreenButton.setOnClickListener {
            exoPlayerView.hideController()
            if (!isFullScreen) {
                with(motionLayout) {
                    getConstraintSet(R.id.start).constrainHeight(R.id.player, -1)
                    enableTransition(R.id.yt_transition, false)
                }

                mainContainer.isClickable = true
                linLayout.visibility = View.GONE
                fullScreenButton.setImageResource(R.drawable.ic_fullscreen_exit)
                exoTitle.visibility = View.VISIBLE

                val mainActivity = activity as MainActivity
                mainActivity.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE
            } else {
                with(motionLayout) {
                    getConstraintSet(R.id.start).constrainHeight(R.id.player, 0)
                    enableTransition(R.id.yt_transition, true)
                }

                mainContainer.isClickable = false
                linLayout.visibility = View.VISIBLE
                fullScreenButton.setImageResource(R.drawable.ic_fullscreen)
                exoTitle.visibility = View.INVISIBLE

                val mainActivity = activity as MainActivity
                mainActivity.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT
            }
            isFullScreen = !isFullScreen
        }

        // switching between original aspect ratio (black bars) and zoomed to fill device screen
        view.findViewById<ImageButton>(R.id.aspect_ratio_button).setOnClickListener {
            if (isZoomed) {
                exoPlayerView.resizeMode = AspectRatioFrameLayout.RESIZE_MODE_FIT
                isZoomed = false
            } else {
                exoPlayerView.resizeMode = AspectRatioFrameLayout.RESIZE_MODE_ZOOM
                isZoomed = true
            }
        }

        // lock and unlock the player
        val lockPlayerButton = view.findViewById<ImageButton>(R.id.lock_player)
        lockPlayerButton.setOnClickListener {
            // change the locked/unlocked icon
            if (!isPlayerLocked) {
                lockPlayerButton.setImageResource(R.drawable.ic_locked)
            } else {
                lockPlayerButton.setImageResource(R.drawable.ic_unlocked)
            }

            // show/hide all the controls
            lockPlayer(isPlayerLocked)

            // change locked status
            isPlayerLocked = !isPlayerLocked
        }

        val scrollView = view.findViewById<ScrollView>(R.id.player_scrollView)
        scrollView.viewTreeObserver
            .addOnScrollChangedListener {
                if (scrollView.getChildAt(0).bottom
                    == (scrollView.height + scrollView.scrollY) &&
                    nextPage != null
                ) {
                    fetchNextComments()
                }
            }

        commentsRecView = view.findViewById(R.id.comments_recView)
        commentsRecView.layoutManager = LinearLayoutManager(view.context)

        commentsRecView.setItemViewCacheSize(20)

        relatedRecView = view.findViewById(R.id.player_recView)
        relatedRecView.layoutManager =
            GridLayoutManager(view.context, resources.getInteger(R.integer.grid_items))
    }

    private fun toggleComments() {
        commentsRecView.visibility =
            if (commentsRecView.isVisible) View.GONE else View.VISIBLE
        relatedRecView.visibility =
            if (relatedRecView.isVisible) View.GONE else View.VISIBLE
        if (!commentsLoaded!!) fetchComments()
    }

    override fun onPause() {
        // pause the player if the screen is turned off
        val pausePlayerOnScreenOffEnabled = PreferenceHelper.getBoolean(
            requireContext(),
            "pause_screen_off",
            false
        )

        // check whether the screen is on
        val pm = context?.getSystemService(Context.POWER_SERVICE) as PowerManager
        val isScreenOn = pm.isInteractive

        // pause player if screen off and setting enabled
        if (exoPlayer != null && !isScreenOn && pausePlayerOnScreenOffEnabled) {
            exoPlayer.pause()
        }
        super.onPause()
    }

    override fun onDestroy() {
        super.onDestroy()
        try {
            mediaSession.isActive = false
            mediaSession.release()
            mediaSessionConnector.setPlayer(null)
            playerNotification.setPlayer(null)
            val notificationManager = context?.getSystemService(
                Context.NOTIFICATION_SERVICE
            ) as NotificationManager
            notificationManager.cancel(1)
            exoPlayer.release()
        } catch (e: Exception) {
        }
    }

    private fun checkForSegments() {
        if (!exoPlayer.isPlaying || !sponsorBlockPrefs.sponsorBlockEnabled) return

        exoPlayerView.postDelayed(this::checkForSegments, 100)

        if (!::segmentData.isInitialized || segmentData.segments.isEmpty()) {
            return
        }

        segmentData.segments.forEach { segment: Segment ->
            val segmentStart = (segment.segment!![0] * 1000.0f).toLong()
            val segmentEnd = (segment.segment[1] * 1000.0f).toLong()
            val currentPosition = exoPlayer.currentPosition
            if (currentPosition in segmentStart until segmentEnd) {
                if (sponsorBlockPrefs.sponsorNotificationsEnabled) {
                    Toast.makeText(context, R.string.segment_skipped, Toast.LENGTH_SHORT).show()
                }
                exoPlayer.seekTo(segmentEnd)
            }
        }
    }

    private fun fetchJsonAndInitPlayer(view: View) {
        fun run() {
            lifecycleScope.launchWhenCreated {
                val response = try {
                    RetrofitInstance.api.getStreams(videoId!!)
                } catch (e: IOException) {
                    println(e)
                    Log.e(TAG, "IOException, you might not have internet connection")
                    Toast.makeText(context, R.string.unknown_error, Toast.LENGTH_SHORT).show()
                    return@launchWhenCreated
                } catch (e: HttpException) {
                    Log.e(TAG, "HttpException, unexpected response")
                    Toast.makeText(context, R.string.server_error, Toast.LENGTH_SHORT).show()
                    return@launchWhenCreated
                }
                // for the notification description adapter
                title = response.title!!
                uploader = response.uploader!!
                thumbnailUrl = response.thumbnailUrl!!

                // save whether related streams and autoplay are enabled
                autoplay = PreferenceHelper.getBoolean(requireContext(), "autoplay", false)
                relatedStreamsEnabled =
                    PreferenceHelper.getBoolean(requireContext(), "related_streams_toggle", true)
                // save related streams for autoplay
                relatedStreams = response.relatedStreams

                runOnUiThread {
                    createExoPlayer(view)
                    if (response.chapters != null) initializeChapters(response.chapters)
                    // set media sources for the player
                    setResolutionAndSubtitles(view, response)
                    exoPlayer.prepare()
                    prepareExoPlayerView()
                    initializePlayerView(view, response)
                    // support for time stamped links
                    if (arguments?.getLong("timeStamp") != null) {
                        val position = arguments?.getLong("timeStamp")!! * 1000
                        exoPlayer.seekTo(position)
                    }
                    exoPlayer.play()
                    exoPlayerView.useController = true
                    initializePlayerNotification(requireContext())
                    fetchSponsorBlockSegments()
                    // show comments if related streams disabled
                    if (!relatedStreamsEnabled) toggleComments()
                    // prepare for autoplay
                    initAutoPlay()
                }
            }
        }
        run()
    }

    // the function is working recursively
    private fun initAutoPlay() {
        // save related streams for autoplay
        if (autoplay) {
            // if it's a playlist use the next video
            if (playlistId != null) {
                lateinit var playlist: Playlist // var for saving the list in
                // runs only the first time when starting a video from a playlist
                if (playlistStreamIds.isEmpty()) {
                    CoroutineScope(Dispatchers.IO).launch {
                        // fetch the playlists videos
                        playlist = RetrofitInstance.api.getPlaylist(playlistId!!)
                        // save the playlist urls in the array
                        playlist.relatedStreams?.forEach { video ->
                            playlistStreamIds += video.url?.replace("/watch?v=", "")!!
                        }
                        // save playlistNextPage for usage if video is not contained
                        playlistNextPage = playlist.nextpage
                        // restart the function after videos are loaded
                        initAutoPlay()
                    }
                }
                // if the playlists contain the video, then save the next video as next stream
                else if (playlistStreamIds.contains(videoId)) {
                    val index = playlistStreamIds.indexOf(videoId)
                    // check whether there's a next video
                    if (index + 1 <= playlistStreamIds.size) {
                        nextStreamId = playlistStreamIds[index + 1]
                    }
                    // fetch the next page of the playlist if the video isn't contained
                } else if (playlistNextPage != null) {
                    CoroutineScope(Dispatchers.IO).launch {
                        RetrofitInstance.api.getPlaylistNextPage(playlistId!!, playlistNextPage!!)
                        // append all the playlist item urls to the array
                        playlist.relatedStreams?.forEach { video ->
                            playlistStreamIds += video.url?.replace("/watch?v=", "")!!
                        }
                        // save playlistNextPage for usage if video is not contained
                        playlistNextPage = playlist.nextpage
                        // restart the function after videos are loaded
                        initAutoPlay()
                    }
                }
                // else: the video must be the last video of the playlist so nothing happens

                // if it's not a playlist then use the next related video
            } else if (relatedStreams != null && relatedStreams!!.isNotEmpty()) {
                // save next video from related streams for autoplay
                nextStreamId = relatedStreams!![0].url!!.replace("/watch?v=", "")!!
            }
        }
    }

    // used for autoplay and skipping to next video
    private fun playNextVideo() {
        // check whether there is a new video in the queue
        // by making sure that the next and the current video aren't the same
        if (videoId != nextStreamId) {
            // save the id of the next stream as videoId and load the next video
            videoId = nextStreamId
            fetchJsonAndInitPlayer(view!!)
        }
    }

    private fun setSponsorBlockPrefs() {
        sponsorBlockPrefs.sponsorBlockEnabled =
            PreferenceHelper.getBoolean(requireContext(), "sb_enabled_key", true)
        sponsorBlockPrefs.sponsorNotificationsEnabled =
            PreferenceHelper.getBoolean(requireContext(), "sb_notifications_key", true)
        sponsorBlockPrefs.introEnabled =
            PreferenceHelper.getBoolean(requireContext(), "intro_category_key", false)
        sponsorBlockPrefs.selfPromoEnabled =
            PreferenceHelper.getBoolean(requireContext(), "selfpromo_category_key", false)
        sponsorBlockPrefs.interactionEnabled =
            PreferenceHelper.getBoolean(requireContext(), "interaction_category_key", false)
        sponsorBlockPrefs.sponsorsEnabled =
            PreferenceHelper.getBoolean(requireContext(), "sponsors_category_key", true)
        sponsorBlockPrefs.outroEnabled =
            PreferenceHelper.getBoolean(requireContext(), "outro_category_key", false)
        sponsorBlockPrefs.fillerEnabled =
            PreferenceHelper.getBoolean(requireContext(), "filler_category_key", false)
        sponsorBlockPrefs.musicOffTopicEnabled =
            PreferenceHelper.getBoolean(requireContext(), "music_offtopic_category_key", false)
        sponsorBlockPrefs.previewEnabled =
            PreferenceHelper.getBoolean(requireContext(), "preview_category_key", false)
    }

    private fun fetchSponsorBlockSegments() {
        fun run() {
            lifecycleScope.launchWhenCreated {
                if (sponsorBlockPrefs.sponsorBlockEnabled) {
                    val categories: ArrayList<String> = arrayListOf()
                    if (sponsorBlockPrefs.introEnabled) {
                        categories.add("intro")
                    }
                    if (sponsorBlockPrefs.selfPromoEnabled) {
                        categories.add("selfpromo")
                    }
                    if (sponsorBlockPrefs.interactionEnabled) {
                        categories.add("interaction")
                    }
                    if (sponsorBlockPrefs.sponsorsEnabled) {
                        categories.add("sponsor")
                    }
                    if (sponsorBlockPrefs.outroEnabled) {
                        categories.add("outro")
                    }
                    if (sponsorBlockPrefs.fillerEnabled) {
                        categories.add("filler")
                    }
                    if (sponsorBlockPrefs.musicOffTopicEnabled) {
                        categories.add("music_offtopic")
                    }
                    if (sponsorBlockPrefs.previewEnabled) {
                        categories.add("preview")
                    }
                    if (categories.size > 0) {
                        segmentData = try {
                            RetrofitInstance.api.getSegments(
                                videoId!!,
                                "[\"" + TextUtils.join("\",\"", categories) + "\"]"
                            )
                        } catch (e: IOException) {
                            println(e)
                            Log.e(TAG, "IOException, you might not have internet connection")
                            Toast.makeText(context, R.string.unknown_error, Toast.LENGTH_SHORT)
                                .show()
                            return@launchWhenCreated
                        } catch (e: HttpException) {
                            Log.e(TAG, "HttpException, unexpected response")
                            Toast.makeText(context, R.string.server_error, Toast.LENGTH_SHORT)
                                .show()
                            return@launchWhenCreated
                        }
                    }
                }
            }
        }
        run()
    }

    private fun prepareExoPlayerView() {
        exoPlayerView.apply {
            setShowSubtitleButton(true)
            setShowNextButton(false)
            setShowPreviousButton(false)
            setRepeatToggleModes(RepeatModeUtil.REPEAT_TOGGLE_MODE_ALL)
            // controllerShowTimeoutMs = 1500
            controllerHideOnTouch = true
            useController = false
            player = exoPlayer
        }
    }

    private fun initializePlayerView(view: View, response: Streams) {
        view.findViewById<TextView>(R.id.player_views_info).text =
            context?.getString(R.string.views, response.views.formatShort()) +
            " • " + response.uploadDate
        view.findViewById<TextView>(R.id.textLike).text = response.likes.formatShort()
        view.findViewById<TextView>(R.id.textDislike).text = response.dislikes.formatShort()
        val channelImage = view.findViewById<ImageView>(R.id.player_channelImage)
        Picasso.get().load(response.uploaderAvatar).into(channelImage)
        view.findViewById<TextView>(R.id.player_channelName).text = response.uploader

        view.findViewById<TextView>(R.id.title_textView).text = response.title
        view.findViewById<TextView>(R.id.player_title).text = response.title
        view.findViewById<TextView>(R.id.player_description).text = response.description

        view.findViewById<TextView>(R.id.exo_title).text = response.title

        // Listener for play and pause icon change
        exoPlayer.addListener(object : Player.Listener {
            override fun onIsPlayingChanged(isPlaying: Boolean) {
                if (isPlaying && sponsorBlockPrefs.sponsorBlockEnabled) {
                    exoPlayerView.postDelayed(
                        this@PlayerFragment::checkForSegments,
                        100
                    )
                }
            }

            @Deprecated(message = "Deprecated", level = DeprecationLevel.HIDDEN)
            override fun onPlayerStateChanged(
                playWhenReady: Boolean,
                playbackState: Int
            ) {
                exoPlayerView.keepScreenOn = !(
                    playbackState == Player.STATE_IDLE ||
                        playbackState == Player.STATE_ENDED ||
                        !playWhenReady
                    )

                // check if video has ended, next video is available and autoplay is enabled.
                if (
                    playbackState == Player.STATE_ENDED &&
                    nextStreamId != null &&
                    !transitioning &&
                    autoplay
                ) {
                    transitioning = true
                    // check whether autoplay is enabled
                    if (autoplay) playNextVideo()
                }

                if (playWhenReady && playbackState == Player.STATE_READY) {
                    // media actually playing
                    transitioning = false
                    view.findViewById<ImageView>(R.id.play_imageView)
                        .setImageResource(R.drawable.ic_pause)
                } else if (playWhenReady) {
                    // might be idle (plays after prepare()),
                    // buffering (plays when data available)
                    // or ended (plays when seek away from end)
                    view.findViewById<ImageView>(R.id.play_imageView)
                        .setImageResource(R.drawable.ic_play)
                } else {
                    // player paused in any state
                    view.findViewById<ImageView>(R.id.play_imageView)
                        .setImageResource(R.drawable.ic_play)
                }
            }
        })

        // share button
        view.findViewById<LinearLayout>(R.id.relPlayer_share).setOnClickListener {
            val shareDialog = ShareDialog(videoId!!, false)
            shareDialog.show(childFragmentManager, "ShareDialog")
        }
        // check if livestream
        if (response.duration!! > 0) {
            // download clicked
            relDownloadVideo.setOnClickListener {
                if (!IS_DOWNLOAD_RUNNING) {
                    val newFragment = DownloadDialog()
                    val bundle = Bundle()
                    bundle.putString("video_id", videoId)
                    bundle.putParcelable("streams", response)
                    newFragment.arguments = bundle
                    newFragment.show(childFragmentManager, "Download")
                } else {
                    Toast.makeText(context, R.string.dlisinprogress, Toast.LENGTH_SHORT)
                        .show()
                }
            }
        } else {
            Toast.makeText(context, R.string.cannotDownload, Toast.LENGTH_SHORT).show()
        }

        if (response.hls != null) {
            view.findViewById<LinearLayout>(R.id.relPlayer_vlc).setOnClickListener {
                // start an intent with video as mimetype using the hls stream
                val uri: Uri = Uri.parse(response.hls)
                val intent = Intent()

                intent.action = Intent.ACTION_VIEW
                intent.setDataAndType(uri, "video/*")
                intent.putExtra(Intent.EXTRA_TITLE, title)
                intent.putExtra("title", title)
                intent.putExtra("artist", uploader)
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)

                startActivity(intent)
            }
        }
        if (relatedStreamsEnabled) {
            // only show related streams if enabled
            relatedRecView.adapter = TrendingAdapter(
                response.relatedStreams!!,
                childFragmentManager
            )
        }
        // set video description
        val description = response.description!!
        view.findViewById<TextView>(R.id.player_description).text =
            // detect whether the description is html formatted
            if (description.contains("<") && description.contains(">")) {
                if (SDK_INT >= Build.VERSION_CODES.N) {
                    Html.fromHtml(description, Html.FROM_HTML_MODE_COMPACT)
                        .trim()
                } else {
                    Html.fromHtml(description).trim()
                }
            } else {
                description
            }

        view.findViewById<RelativeLayout>(R.id.player_channel).setOnClickListener {
            val activity = view.context as MainActivity
            val bundle = bundleOf("channel_id" to response.uploaderUrl)
            activity.navController.navigate(R.id.channel, bundle)
            activity.findViewById<MotionLayout>(R.id.mainMotionLayout).transitionToEnd()
            view.findViewById<MotionLayout>(R.id.playerMotionLayout).transitionToEnd()
        }
        val token = PreferenceHelper.getToken(requireContext())
        if (token != "") {
            val channelId = response.uploaderUrl?.replace("/channel/", "")
            val subButton = view.findViewById<MaterialButton>(R.id.player_subscribe)
            isSubscribed(subButton, channelId!!)
            view.findViewById<LinearLayout>(R.id.save).setOnClickListener {
                val newFragment = AddtoPlaylistDialog()
                val bundle = Bundle()
                bundle.putString("videoId", videoId)
                newFragment.arguments = bundle
                newFragment.show(childFragmentManager, "AddToPlaylist")
            }
        }
    }

    private fun initializeChapters(chapters: List<ChapterSegment>) {
        val chaptersRecView = view?.findViewById<RecyclerView>(R.id.chapters_recView)

        if (chapters.isNotEmpty()) {
            chaptersRecView?.layoutManager =
                LinearLayoutManager(this.context, LinearLayoutManager.HORIZONTAL, false)
            chaptersRecView?.adapter = ChaptersAdapter(chapters, exoPlayer)
            chaptersRecView?.visibility = View.VISIBLE
        }
    }

    private fun setMediaSource(
        subtitle: MutableList<SubtitleConfiguration>,
        videoUri: Uri,
        audioUrl: String
    ) {
        val dataSourceFactory: DataSource.Factory =
            DefaultHttpDataSource.Factory()
        val videoItem: MediaItem = MediaItem.Builder()
            .setUri(videoUri)
            .setSubtitleConfigurations(subtitle)
            .build()
        val videoSource: MediaSource =
            DefaultMediaSourceFactory(dataSourceFactory)
                .createMediaSource(videoItem)
        var audioSource: MediaSource =
            ProgressiveMediaSource.Factory(dataSourceFactory)
                .createMediaSource(fromUri(audioUrl))
        val mergeSource: MediaSource =
            MergingMediaSource(videoSource, audioSource)
        exoPlayer.setMediaSource(mergeSource)
    }

    private fun setResolutionAndSubtitles(view: View, response: Streams) {
        val videoFormatPreference =
            PreferenceHelper.getString(requireContext(), "player_video_format", "WEBM")
        val defres = PreferenceHelper.getString(requireContext(), "default_res", "")!!

        val qualityText = view.findViewById<TextView>(R.id.quality_text)
        val qualitySelect = view.findViewById<LinearLayout>(R.id.quality_linLayout)

        var videosNameArray: Array<CharSequence> = arrayOf()
        var videosUrlArray: Array<Uri> = arrayOf()

        // append hls to list if available
        if (response.hls != null) {
            videosNameArray += "HLS"
            videosUrlArray += response.hls.toUri()
        }

        for (vid in response.videoStreams!!) {
            // append quality to list if it has the preferred format (e.g. MPEG)
            if (vid.format.equals(videoFormatPreference)) { // preferred format
                videosNameArray += vid.quality!!
                videosUrlArray += vid.url!!.toUri()
            } else if (vid.quality.equals("LBRY") && vid.format.equals("MP4")) { // LBRY MP4 format)
                videosNameArray += "LBRY MP4"
                videosUrlArray += vid.url!!.toUri()
            }
        }
        // create a list of subtitles
        val subtitle = mutableListOf<SubtitleConfiguration>()
        response.subtitles!!.forEach {
            subtitle.add(
                SubtitleConfiguration.Builder(it.url!!.toUri())
                    .setMimeType(it.mimeType!!) // The correct MIME type (required).
                    .setLanguage(it.code) // The subtitle language (optional).
                    .build()
            )
        }
        // set resolution in the beginning
        when {
            // search for the default resolution in the videoNamesArray, select quality if found
            defres != "" -> {
                run lit@{
                    videosNameArray.forEachIndexed { index, pipedStream ->
                        if (pipedStream.contains(defres)) {
                            val videoUri = videosUrlArray[index]
                            val audioUrl = getMostBitRate(response.audioStreams!!)
                            setMediaSource(subtitle, videoUri, audioUrl)
                            qualityText.text = videosNameArray[index]
                            return@lit
                        } else if (response.hls != null) {
                            val mediaItem: MediaItem = MediaItem.Builder()
                                .setUri(response.hls)
                                .setSubtitleConfigurations(subtitle)
                                .build()
                            exoPlayer.setMediaItem(mediaItem)
                        } else {
                            Toast.makeText(
                                context,
                                getString(R.string.unknown_error),
                                Toast.LENGTH_LONG
                            ).show()
                        }
                    }
                }
            }
            // if defres doesn't match use hls if available
            response.hls != null -> {
                val mediaItem: MediaItem = MediaItem.Builder()
                    .setUri(response.hls)
                    .setSubtitleConfigurations(subtitle)
                    .build()
                exoPlayer.setMediaItem(mediaItem)
            }
            // otherwise use the first list entry
            else -> {
                val videoUri = videosUrlArray[0]
                val audioUrl = getMostBitRate(response.audioStreams!!)
                setMediaSource(subtitle, videoUri, audioUrl)
                qualityText.text = videosNameArray[0]
            }
        }

        qualitySelect.setOnClickListener {
            // Dialog for quality selection
            val builder: MaterialAlertDialogBuilder? = activity?.let {
                MaterialAlertDialogBuilder(it)
            }
            val lastPosition = exoPlayer.currentPosition
            builder!!.setTitle(R.string.choose_quality_dialog)
                .setItems(
                    videosNameArray
                ) { _, which ->
                    whichQuality = which
                    if (
                        videosNameArray[which] == "HLS" ||
                        videosNameArray[which] == "LBRY HLS"
                    ) {
                        // no need to merge sources if using hls
                        val mediaItem: MediaItem = MediaItem.Builder()
                            .setUri(videosUrlArray[which])
                            .setSubtitleConfigurations(subtitle)
                            .build()
                        exoPlayer.setMediaItem(mediaItem)
                    } else {
                        val videoUri = videosUrlArray[which]
                        val audioUrl = getMostBitRate(response.audioStreams!!)
                        setMediaSource(subtitle, videoUri, audioUrl)
                    }
                    exoPlayer.seekTo(lastPosition)
                    qualityText.text = videosNameArray[which]
                }
            val dialog = builder.create()
            dialog.show()
        }
    }

    private fun createExoPlayer(view: View) {
        val playbackSpeed =
            PreferenceHelper.getString(requireContext(), "playback_speed", "1F")?.toFloat()
        // multiply by thousand: s -> ms
        val bufferingGoal =
            PreferenceHelper.getString(requireContext(), "buffering_goal", "50")?.toInt()!! * 1000
        val seekIncrement =
            PreferenceHelper.getString(requireContext(), "seek_increment", "5")?.toLong()!! * 1000

        val cronetEngine: CronetEngine = CronetHelper.getCronetEngine()
        val cronetDataSourceFactory: CronetDataSource.Factory =
            CronetDataSource.Factory(cronetEngine, Executors.newCachedThreadPool())

        val dataSourceFactory = DefaultDataSource.Factory(
            requireContext(),
            cronetDataSourceFactory
        )

        // handles the audio focus
        val audioAttributes = AudioAttributes.Builder()
            .setUsage(C.USAGE_MEDIA)
            .setContentType(C.CONTENT_TYPE_MOVIE)
            .build()

        // handles the duration of media to retain in the buffer prior to the current playback position (for fast backward seeking)
        val loadControl = DefaultLoadControl.Builder()
            // cache the last three minutes
            .setBackBuffer(1000 * 60 * 3, true)
            .setBufferDurationsMs(
                DefaultLoadControl.DEFAULT_MIN_BUFFER_MS,
                bufferingGoal,
                DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_MS,
                DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS
            )
            .build()

        exoPlayer = ExoPlayer.Builder(view.context)
            .setMediaSourceFactory(DefaultMediaSourceFactory(dataSourceFactory))
            .setLoadControl(loadControl)
            .setSeekBackIncrementMs(seekIncrement)
            .setSeekForwardIncrementMs(seekIncrement)
            .build()

        exoPlayer.setAudioAttributes(audioAttributes, true)

        exoPlayer.setPlaybackSpeed(playbackSpeed!!)
    }

    private fun initializePlayerNotification(c: Context) {
        mediaSession = MediaSessionCompat(c, this.javaClass.name)
        mediaSession.apply {
            isActive = true
        }

        mediaSessionConnector = MediaSessionConnector(mediaSession)
        mediaSessionConnector.setPlayer(exoPlayer)

        playerNotification = PlayerNotificationManager
            .Builder(c, 1, "background_mode")
            .setMediaDescriptionAdapter(
                DescriptionAdapter(title, uploader, thumbnailUrl, requireContext())
            )
            .build()

        playerNotification.apply {
            setPlayer(exoPlayer)
            setUseNextAction(false)
            setUsePreviousAction(false)
            setMediaSessionToken(mediaSession.sessionToken)
        }
    }

    private fun lockPlayer(isLocked: Boolean) {
        val visibility = if (isLocked) View.VISIBLE else View.INVISIBLE
        exoPlayerView.findViewById<LinearLayout>(R.id.exo_top_bar_right).visibility = visibility
        exoPlayerView.findViewById<ImageButton>(R.id.exo_play_pause).visibility = visibility
        exoPlayerView.findViewById<Button>(R.id.exo_ffwd_with_amount).visibility = visibility
        exoPlayerView.findViewById<Button>(R.id.exo_rew_with_amount).visibility = visibility
        exoPlayerView.findViewById<FrameLayout>(R.id.exo_bottom_bar).visibility = visibility
        exoPlayerView.findViewById<TextView>(R.id.exo_title).visibility =
            if (isLocked && isFullScreen) View.VISIBLE else View.INVISIBLE
    }

    private fun isSubscribed(button: MaterialButton, channel_id: String) {
        @SuppressLint("ResourceAsColor")
        fun run() {
            lifecycleScope.launchWhenCreated {
                val response = try {
                    val token = PreferenceHelper.getToken(requireContext())
                    RetrofitInstance.api.isSubscribed(
                        channel_id,
                        token
                    )
                } catch (e: IOException) {
                    println(e)
                    Log.e(TAG, "IOException, you might not have internet connection")
                    return@launchWhenCreated
                } catch (e: HttpException) {
                    Log.e(TAG, "HttpException, unexpected response")
                    return@launchWhenCreated
                }

                runOnUiThread {
                    if (response.subscribed == true) {
                        isSubscribed = true
                        button.text = getString(R.string.unsubscribe)
                    }
                    if (response.subscribed != null) {
                        button.setOnClickListener {
                            if (isSubscribed) {
                                unsubscribe(channel_id)
                                button.text = getString(R.string.subscribe)
                            } else {
                                subscribe(channel_id)
                                button.text = getString(R.string.unsubscribe)
                            }
                        }
                    }
                }
            }
        }
        run()
    }

    private fun subscribe(channel_id: String) {
        fun run() {
            lifecycleScope.launchWhenCreated {
                val response = try {
                    val token = PreferenceHelper.getToken(requireContext())
                    RetrofitInstance.api.subscribe(
                        token,
                        Subscribe(channel_id)
                    )
                } catch (e: IOException) {
                    println(e)
                    Log.e(TAG, "IOException, you might not have internet connection")
                    return@launchWhenCreated
                } catch (e: HttpException) {
                    Log.e(TAG, "HttpException, unexpected response$e")
                    return@launchWhenCreated
                }
                isSubscribed = true
            }
        }
        run()
    }

    private fun unsubscribe(channel_id: String) {
        fun run() {
            lifecycleScope.launchWhenCreated {
                val response = try {
                    val token = PreferenceHelper.getToken(requireContext())
                    RetrofitInstance.api.unsubscribe(
                        token,
                        Subscribe(channel_id)
                    )
                } catch (e: IOException) {
                    println(e)
                    Log.e(TAG, "IOException, you might not have internet connection")
                    return@launchWhenCreated
                } catch (e: HttpException) {
                    Log.e(TAG, "HttpException, unexpected response")
                    return@launchWhenCreated
                }
                isSubscribed = false
            }
        }
        run()
    }

    private fun Fragment?.runOnUiThread(action: () -> Unit) {
        this ?: return
        if (!isAdded) return // Fragment not attached to an Activity
        activity?.runOnUiThread(action)
    }

    private fun getMostBitRate(audios: List<PipedStream>): String {
        var bitrate = 0
        var index = 0
        for ((i, audio) in audios.withIndex()) {
            val q = audio.quality!!.replace(" kbps", "").toInt()
            if (q > bitrate) {
                bitrate = q
                index = i
            }
        }
        return audios[index].url!!
    }

    private fun fetchComments() {
        lifecycleScope.launchWhenCreated {
            val commentsResponse = try {
                RetrofitInstance.api.getComments(videoId!!)
            } catch (e: IOException) {
                println(e)
                Log.e(TAG, "IOException, you might not have internet connection")
                Toast.makeText(context, R.string.unknown_error, Toast.LENGTH_SHORT).show()
                return@launchWhenCreated
            } catch (e: HttpException) {
                Log.e(TAG, "HttpException, unexpected response")
                return@launchWhenCreated
            }
            commentsAdapter = CommentsAdapter(videoId!!, commentsResponse.comments)
            commentsRecView.adapter = commentsAdapter
            nextPage = commentsResponse.nextpage
            commentsLoaded = true
            isLoading = false
        }
    }

    private fun fetchNextComments() {
        lifecycleScope.launchWhenCreated {
            if (!isLoading) {
                isLoading = true
                val response = try {
                    RetrofitInstance.api.getCommentsNextPage(videoId!!, nextPage!!)
                } catch (e: IOException) {
                    println(e)
                    Log.e(TAG, "IOException, you might not have internet connection")
                    return@launchWhenCreated
                } catch (e: HttpException) {
                    Log.e(TAG, "HttpException, unexpected response," + e.response())
                    return@launchWhenCreated
                }
                nextPage = response.nextpage
                commentsAdapter?.updateItems(response.comments)
                isLoading = false
            }
        }
    }

    override fun onPictureInPictureModeChanged(isInPictureInPictureMode: Boolean) {
        super.onPictureInPictureModeChanged(isInPictureInPictureMode)
        if (isInPictureInPictureMode) {
            exoPlayerView.hideController()
            exoPlayerView.useController = false
            with(motionLayout) {
                getConstraintSet(R.id.start).constrainHeight(R.id.player, -1)
                enableTransition(R.id.yt_transition, false)
            }
            view?.findViewById<ConstraintLayout>(R.id.main_container)?.isClickable = true
            view?.findViewById<LinearLayout>(R.id.top_bar)?.visibility = View.GONE
            val mainActivity = activity as MainActivity
            mainActivity.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT
            isFullScreen = false
        } else {
            with(motionLayout) {
                getConstraintSet(R.id.start).constrainHeight(R.id.player, 0)
                enableTransition(R.id.yt_transition, true)
            }
            exoPlayerView.showController()
            exoPlayerView.useController = true
            view?.findViewById<ConstraintLayout>(R.id.main_container)?.isClickable = false
            view?.findViewById<LinearLayout>(R.id.top_bar)?.visibility = View.VISIBLE
        }
    }

    fun onUserLeaveHint() {
        val bounds = Rect()
        val scrollView = view?.findViewById<ScrollView>(R.id.player_scrollView)
        scrollView?.getHitRect(bounds)

        if (SDK_INT >= Build.VERSION_CODES.O &&
            exoPlayer.isPlaying && (
                scrollView?.getLocalVisibleRect(bounds) == true ||
                    isFullScreen
                )
        ) {
            activity?.enterPictureInPictureMode(updatePipParams())
        }
    }

    private fun updatePipParams() = PictureInPictureParams.Builder()
        .setActions(emptyList())
        .build()
}