LibreTube/app/src/main/java/com/github/libretube/util/PlayingQueue.kt

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package com.github.libretube.util
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import android.util.Log
import androidx.media3.common.Player
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import com.github.libretube.api.PlaylistsHelper
import com.github.libretube.api.RetrofitInstance
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import com.github.libretube.api.obj.StreamItem
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import com.github.libretube.extensions.move
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import com.github.libretube.extensions.toID
import com.github.libretube.helpers.PlayerHelper
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
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object PlayingQueue {
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private val queue = mutableListOf<StreamItem>()
private var currentStream: StreamItem? = null
private val scope = CoroutineScope(Dispatchers.IO)
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/**
* Listener that gets called when the user selects an item from the queue
*/
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private var onQueueTapListener: (StreamItem) -> Unit = {}
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var repeatMode: Int = Player.REPEAT_MODE_OFF
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fun clear() = queue.clear()
/**
* @param skipExisting Whether to skip the [streamItem] if it's already part of the queue
*/
fun add(vararg streamItem: StreamItem, skipExisting: Boolean = false) {
for (stream in streamItem) {
if ((skipExisting && contains(stream)) || stream.title.isNullOrBlank()) continue
queue.remove(stream)
queue.add(stream)
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}
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}
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fun addAsNext(streamItem: StreamItem) {
if (currentStream == streamItem) return
if (queue.contains(streamItem)) queue.remove(streamItem)
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queue.add(
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currentIndex() + 1,
streamItem
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)
}
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// return the next item, or if repeating enabled, the first one of the queue
fun getNext(): String? {
if (repeatMode != Player.REPEAT_MODE_ONE) {
queue.getOrNull(currentIndex() + 1)?.url?.toID()?.let { return it }
}
return when (repeatMode) {
Player.REPEAT_MODE_ALL -> queue.firstOrNull()?.url?.toID()
Player.REPEAT_MODE_ONE -> currentStream?.url?.toID()
else -> null
}
}
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// return the previous item, or if repeating enabled, the last one of the queue
fun getPrev(): String? {
if (repeatMode != Player.REPEAT_MODE_ONE) {
queue.getOrNull(currentIndex() - 1)?.url?.toID()?.let { return it }
}
return when (repeatMode) {
Player.REPEAT_MODE_ALL -> queue.lastOrNull()?.url?.toID()
Player.REPEAT_MODE_ONE -> currentStream?.url?.toID()
else -> null
}
}
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fun hasPrev() = getPrev() != null
fun hasNext() = getNext() != null
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fun updateCurrent(streamItem: StreamItem, asFirst: Boolean = true) {
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currentStream = streamItem
if (!contains(streamItem)) {
val indexToAdd = if (asFirst) 0 else size()
queue.add(indexToAdd, streamItem)
}
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}
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fun isNotEmpty() = queue.isNotEmpty()
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fun isEmpty() = queue.isEmpty()
fun size() = queue.size
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fun isLast() = currentIndex() == size() - 1
fun currentIndex(): Int = queue.indexOfFirst {
it.url?.toID() == currentStream?.url?.toID()
}.takeIf { it >= 0 } ?: 0
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fun getCurrent(): StreamItem? = currentStream
fun contains(streamItem: StreamItem) = queue.any { it.url?.toID() == streamItem.url?.toID() }
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// only returns a copy of the queue, no write access
fun getStreams() = queue.toList()
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fun setStreams(streams: List<StreamItem>) {
queue.clear()
queue.addAll(streams)
}
fun remove(index: Int) = queue.removeAt(index)
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fun move(from: Int, to: Int) = queue.move(from, to)
/**
* Adds a list of videos to the current queue while updating the position of the current stream
* @param isMainList whether the videos are part of the list that initially has been used to
* start the queue, either from a channel or playlist. If it's false, the current stream won't
* be touched, since it's an independent list.
*/
private fun addToQueueAsync(
streams: List<StreamItem>,
currentStreamItem: StreamItem? = null,
isMainList: Boolean = true
) {
if (!isMainList) {
add(*streams.toTypedArray())
return
}
val currentStream = currentStreamItem ?: this.currentStream
// if the stream already got added to the queue earlier, although it's not yet
// been found in the playlist, remove it and re-add it later
var reAddStream = true
if (currentStream != null && streams.includes(currentStream)) {
queue.removeAll { it.url?.toID() == currentStream.url?.toID() }
reAddStream = false
}
// add all new stream items to the queue
add(*streams.toTypedArray())
if (currentStream != null && reAddStream) {
// re-add the stream to the end of the queue
updateCurrent(currentStream, false)
}
}
private fun fetchMoreFromPlaylist(playlistId: String, nextPage: String?, isMainList: Boolean) {
var playlistNextPage = nextPage
scope.launch(Dispatchers.IO) {
while (playlistNextPage != null) {
RetrofitInstance.authApi.getPlaylistNextPage(playlistId, playlistNextPage!!).run {
addToQueueAsync(relatedStreams, isMainList = isMainList)
playlistNextPage = this.nextpage
}
}
}
}
fun insertPlaylist(playlistId: String, newCurrentStream: StreamItem?) {
scope.launch(Dispatchers.IO) {
runCatching {
val playlist = PlaylistsHelper.getPlaylist(playlistId)
val isMainList = newCurrentStream != null
addToQueueAsync(playlist.relatedStreams, newCurrentStream, isMainList)
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if (playlist.nextpage == null) return@launch
fetchMoreFromPlaylist(playlistId, playlist.nextpage, isMainList)
}
}
}
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private fun fetchMoreFromChannel(channelId: String, nextPage: String?) {
var channelNextPage = nextPage
scope.launch(Dispatchers.IO) {
runCatching {
while (channelNextPage != null) {
RetrofitInstance.api.getChannelNextPage(channelId, nextPage!!).run {
addToQueueAsync(relatedStreams)
channelNextPage = this.nextpage
}
}
}
}
}
private fun insertChannel(channelId: String, newCurrentStream: StreamItem) {
scope.launch(Dispatchers.IO) {
runCatching {
val channel = RetrofitInstance.api.getChannel(channelId)
addToQueueAsync(channel.relatedStreams, newCurrentStream)
if (channel.nextpage == null) return@launch
fetchMoreFromChannel(channelId, channel.nextpage)
}
}
}
fun insertByVideoId(videoId: String) {
scope.launch {
runCatching {
val streams = RetrofitInstance.api.getStreams(videoId.toID())
add(streams.toStreamItem(videoId))
}
}
}
fun updateQueue(streamItem: StreamItem, playlistId: String?, channelId: String?, relatedStreams: List<StreamItem> = emptyList()) {
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if (playlistId != null) {
insertPlaylist(playlistId, streamItem)
} else if (channelId != null) {
insertChannel(channelId, streamItem)
} else if (relatedStreams.isNotEmpty()) {
insertRelatedStreams(relatedStreams)
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}
updateCurrent(streamItem)
}
fun insertRelatedStreams(streams: List<StreamItem>) {
if (!PlayerHelper.autoInsertRelatedVideos) return
add(*streams.toTypedArray(), skipExisting = true)
}
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fun onQueueItemSelected(index: Int) {
try {
val streamItem = queue[index]
updateCurrent(streamItem)
onQueueTapListener.invoke(streamItem)
} catch (e: Exception) {
Log.e("Queue on tap", "lifecycle already ended")
}
}
fun setOnQueueTapListener(listener: (StreamItem) -> Unit) {
onQueueTapListener = listener
}
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fun resetToDefaults() {
repeatMode = Player.REPEAT_MODE_OFF
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onQueueTapListener = {}
}
private fun List<StreamItem>.includes(item: StreamItem) = any {
it.url?.toID() == item.url?.toID()
}
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}