add the mini player and now playing screen

app/src/main/kotlin/com/subtracks/ui/AppRoot.kt

@@ -1,13 +1,30 @@
 package com.subtracks.ui
 
 import android.net.Uri
+import androidx.activity.compose.BackHandler
+import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.core.tween
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.animation.slideInHorizontally
+import androidx.compose.animation.slideInVertically
 import androidx.compose.animation.slideOutHorizontally
+import androidx.compose.animation.slideOutVertically
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.consumeWindowInsets
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.dp
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewModelScope
@@ -17,15 +34,19 @@ import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
 import androidx.navigation.navArgument
 import com.subtracks.data.repo.SourceRepository
+import com.subtracks.playback.PlaybackController
 import com.subtracks.ui.components.LoadingState
 import com.subtracks.ui.library.AlbumDetailRoute
 import com.subtracks.ui.library.LibraryRoute
 import com.subtracks.ui.library.PlaylistDetailRoute
+import com.subtracks.ui.playback.MiniPlayer
+import com.subtracks.ui.playback.NowPlayingRoute
 import com.subtracks.ui.settings.AddSourceRoute
 import com.subtracks.ui.settings.SettingsRoute
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
+import org.koin.compose.koinInject
 import org.koin.compose.viewmodel.koinViewModel
 
 class RootViewModel(
@@ -39,6 +60,7 @@ class RootViewModel(
 }
 
 private const val NAVIGATION_DURATION_MS = 260
+private const val NOW_PLAYING_DURATION_MS = 300
 
 private object Routes {
     const val LIBRARY = "library"
@@ -64,9 +86,29 @@ fun SubtracksRoot(root: RootViewModel = koinViewModel()) {
 @Composable
 private fun MainNavigation() {
     val navController = rememberNavController()
+    val playbackController = koinInject<PlaybackController>()
+    val playback by playbackController.state.collectAsStateWithLifecycle()
+    var showingNowPlaying by rememberSaveable { mutableStateOf(false) }
+    LaunchedEffect(Unit) { playbackController.connect() }
 
+    val playerVisible = playback.item != null
+    val density = LocalDensity.current
+    val navBarInset = with(density) { WindowInsets.navigationBars.getBottom(this).toDp() }
+
+    Box(Modifier.fillMaxSize()) {
+        Column(Modifier.fillMaxSize()) {
             NavHost(
                 navController = navController,
+                modifier =
+                    Modifier
+                        .weight(1f)
+                        .then(
+                            if (playerVisible) {
+                                Modifier.consumeWindowInsets(WindowInsets.navigationBars)
+                            } else {
+                                Modifier
+                            },
+                        ),
                 startDestination = Routes.LIBRARY,
                 enterTransition = {
                     slideInHorizontally(initialOffsetX = { it / 4 }, animationSpec = tween(NAVIGATION_DURATION_MS)) +
@@ -90,6 +132,7 @@ private fun MainNavigation() {
                         onAlbumClick = { album -> navController.navigate(Routes.album(album.id)) },
                         onPlaylistClick = { playlist -> navController.navigate(Routes.playlist(playlist.id)) },
                         onOpenSettings = { navController.navigate(Routes.SETTINGS) },
+                        bottomInset = if (playerVisible) 0.dp else navBarInset,
                     )
                 }
                 composable(Routes.SETTINGS) {
@@ -123,4 +166,29 @@ private fun MainNavigation() {
                     )
                 }
             }
+
+            if (playerVisible) {
+                MiniPlayer(
+                    state = playback,
+                    coverArt = playbackController.coverArt(playback.item, thumbnail = true),
+                    onExpand = { showingNowPlaying = true },
+                    onPlayPause = playbackController::togglePlayPause,
+                    onNext = playbackController::next,
+                )
+            }
+        }
+
+        AnimatedVisibility(
+            visible = showingNowPlaying,
+            enter = slideInVertically(initialOffsetY = { it }) + fadeIn(tween(NOW_PLAYING_DURATION_MS)),
+            exit = slideOutVertically(targetOffsetY = { it }) + fadeOut(tween(NOW_PLAYING_DURATION_MS)),
+        ) {
+            NowPlayingRoute(
+                onBack = { showingNowPlaying = false },
+                modifier = Modifier.fillMaxSize(),
+            )
+        }
+    }
+
+    BackHandler(enabled = showingNowPlaying) { showingNowPlaying = false }
 }

app/src/main/kotlin/com/subtracks/ui/library/AlbumDetailScreen.kt

@@ -1,5 +1,6 @@
 package com.subtracks.ui.library
 
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -8,7 +9,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.rounded.ArrowBack
@@ -28,8 +29,11 @@ import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import com.subtracks.data.model.Album
 import com.subtracks.data.model.CoverArtRef
+import com.subtracks.data.model.QueueKind
 import com.subtracks.data.model.Song
+import com.subtracks.playback.PlaybackController
 import com.subtracks.ui.components.CoverArt
+import org.koin.compose.koinInject
 import org.koin.compose.viewmodel.koinViewModel
 import org.koin.core.parameter.parametersOf
 
@@ -38,14 +42,19 @@ fun AlbumDetailRoute(
     albumId: String,
     onBack: () -> Unit,
     viewModel: AlbumDetailViewModel = koinViewModel(key = albumId) { parametersOf(albumId) },
+    playbackController: PlaybackController = koinInject(),
 ) {
     val album by viewModel.album.collectAsStateWithLifecycle(initialValue = null)
     val songs by viewModel.songs.collectAsStateWithLifecycle(initialValue = emptyList())
+    val playback by playbackController.state.collectAsStateWithLifecycle()
+    val context = playback.context
     AlbumDetailScreen(
         album = album,
         songs = songs,
         coverArt = viewModel::coverArt,
         onBack = onBack,
+        onSongClick = viewModel::play,
+        playingSongId = playback.item?.id.takeIf { context?.kind == QueueKind.Album && context.refId == albumId },
     )
 }
 
@@ -56,6 +65,8 @@ fun AlbumDetailScreen(
     songs: List<Song>,
     coverArt: (String?, Boolean) -> CoverArtRef?,
     onBack: () -> Unit,
+    onSongClick: (Int) -> Unit,
+    playingSongId: String? = null,
     modifier: Modifier = Modifier,
 ) {
     Scaffold(
@@ -81,7 +92,7 @@ fun AlbumDetailScreen(
                     CoverArt(
                         ref = coverArt(album?.coverArt, false),
                         name = album?.name.orEmpty(),
-                        modifier = Modifier.size(120.dp).clip(RoundedCornerShape(12.dp)),
+                        modifier = Modifier.size(120.dp).clip(RoundedCornerShape(2.dp)),
                     )
                     Column {
                         Text(album?.name.orEmpty(), style = MaterialTheme.typography.titleLarge)
@@ -98,7 +109,13 @@ fun AlbumDetailScreen(
                     }
                 }
             }
-            items(songs, key = { it.id }) { song -> SongRow(song) }
+            itemsIndexed(songs, key = { _, song -> song.id }) { index, song ->
+                SongRow(
+                    song = song,
+                    isPlaying = song.id == playingSongId,
+                    modifier = Modifier.clickable { onSongClick(index) },
+                )
+            }
         }
     }
 }

app/src/main/kotlin/com/subtracks/ui/library/AlbumDetailViewModel.kt

@@ -1,21 +1,26 @@
 package com.subtracks.ui.library
 
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
 import com.subtracks.data.model.Album
 import com.subtracks.data.model.CoverArtRef
 import com.subtracks.data.model.Song
 import com.subtracks.data.repo.LibraryRepository
 import com.subtracks.data.repo.SourceRepository
+import com.subtracks.playback.PlaybackController
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class AlbumDetailViewModel(
     private val libraryRepository: LibraryRepository,
     private val sourceRepository: SourceRepository,
-    albumId: String,
+    private val playbackController: PlaybackController,
+    private val albumId: String,
 ) : ViewModel() {
     private val sourceId = libraryRepository.activeSourceId.filterNotNull()
 
@@ -27,4 +32,10 @@ class AlbumDetailViewModel(
         coverArt: String?,
         thumbnail: Boolean,
     ): CoverArtRef? = sourceRepository.coverArt(coverArt, thumbnail)
+
+    fun play(startIndex: Int) {
+        viewModelScope.launch {
+            playbackController.playAlbum(sourceId.first(), albumId, startIndex.toLong())
+        }
+    }
 }

app/src/main/kotlin/com/subtracks/ui/library/LibraryScreen.kt

@@ -57,6 +57,7 @@ import androidx.compose.ui.input.nestedscroll.nestedScroll
 import androidx.compose.ui.layout.boundsInParent
 import androidx.compose.ui.layout.onGloballyPositioned
 import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.IntOffset
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -87,6 +88,7 @@ fun LibraryRoute(
     onAlbumClick: (Album) -> Unit,
     onPlaylistClick: (Playlist) -> Unit,
     onOpenSettings: () -> Unit,
+    bottomInset: Dp,
     viewModel: LibraryViewModel = koinViewModel(),
 ) {
     var selectedTab by rememberSaveable { mutableStateOf(LibraryTab.Albums) }
@@ -95,6 +97,7 @@ fun LibraryRoute(
         selectedTab = selectedTab,
         onTabSelected = { selectedTab = it },
         syncing = syncing,
+        bottomInset = bottomInset,
         albums = viewModel.albums.collectAsLazyPagingItems(),
         artists = viewModel.artists.collectAsLazyPagingItems(),
         songs = viewModel.songs.collectAsLazyPagingItems(),
@@ -122,6 +125,7 @@ fun LibraryScreen(
     onSync: () -> Unit,
     onOpenSettings: () -> Unit,
     syncing: Boolean = false,
+    bottomInset: Dp = 0.dp,
     modifier: Modifier = Modifier,
 ) {
     val pagerState =
@@ -153,7 +157,6 @@ fun LibraryScreen(
     val titleFraction = scrollBehavior.state.collapsedFraction
 
     val statusBarTop = with(density) { WindowInsets.statusBars.getTop(this).toDp() }
-    val bottomInset = with(density) { WindowInsets.navigationBars.getBottom(this).toDp() }
 
     Column(
         modifier =

app/src/main/kotlin/com/subtracks/ui/library/PlaylistDetailScreen.kt

@@ -1,5 +1,6 @@
 package com.subtracks.ui.library
 
+import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
@@ -30,8 +31,11 @@ import androidx.paging.compose.collectAsLazyPagingItems
 import androidx.paging.compose.itemKey
 import com.subtracks.data.model.CoverArtRef
 import com.subtracks.data.model.Playlist
+import com.subtracks.data.model.QueueKind
 import com.subtracks.data.model.SongListItem
+import com.subtracks.playback.PlaybackController
 import com.subtracks.ui.components.CoverArt
+import org.koin.compose.koinInject
 import org.koin.compose.viewmodel.koinViewModel
 import org.koin.core.parameter.parametersOf
 
@@ -40,13 +44,18 @@ fun PlaylistDetailRoute(
     playlistId: String,
     onBack: () -> Unit,
     viewModel: PlaylistDetailViewModel = koinViewModel(key = playlistId) { parametersOf(playlistId) },
+    playbackController: PlaybackController = koinInject(),
 ) {
     val playlist by viewModel.playlist.collectAsStateWithLifecycle(initialValue = null)
+    val playback by playbackController.state.collectAsStateWithLifecycle()
+    val context = playback.context
     PlaylistDetailScreen(
         playlist = playlist,
         songs = viewModel.songs.collectAsLazyPagingItems(),
         coverArt = viewModel::coverArt,
         onBack = onBack,
+        onSongClick = viewModel::play,
+        playingSongId = playback.item?.id.takeIf { context?.kind == QueueKind.Playlist && context.refId == playlistId },
     )
 }
 
@@ -57,6 +66,8 @@ fun PlaylistDetailScreen(
     songs: LazyPagingItems<SongListItem>,
     coverArt: (String?, Boolean) -> CoverArtRef?,
     onBack: () -> Unit,
+    onSongClick: (Int) -> Unit,
+    playingSongId: String? = null,
     modifier: Modifier = Modifier,
 ) {
     Scaffold(
@@ -82,7 +93,7 @@ fun PlaylistDetailScreen(
                     CoverArt(
                         ref = coverArt(playlist?.coverArt, false),
                         name = playlist?.name.orEmpty(),
-                        modifier = Modifier.size(120.dp).clip(RoundedCornerShape(12.dp)),
+                        modifier = Modifier.size(120.dp).clip(RoundedCornerShape(2.dp)),
                     )
                     Column {
                         Text(playlist?.name.orEmpty(), style = MaterialTheme.typography.titleLarge)
@@ -97,7 +108,13 @@ fun PlaylistDetailScreen(
             items(count = songs.itemCount, key = songs.itemKey { it.song.id }) { index ->
                 val item = songs[index]
                 if (item != null) {
-                    SongRow(song = item.song, coverArtId = item.coverArt, coverArt = coverArt)
+                    SongRow(
+                        song = item.song,
+                        coverArtId = item.coverArt,
+                        coverArt = coverArt,
+                        isPlaying = item.song.id == playingSongId,
+                        modifier = Modifier.clickable { onSongClick(index) },
+                    )
                 }
             }
         }

app/src/main/kotlin/com/subtracks/ui/library/PlaylistDetailViewModel.kt

@@ -9,16 +9,20 @@ import com.subtracks.data.model.Playlist
 import com.subtracks.data.model.SongListItem
 import com.subtracks.data.repo.LibraryRepository
 import com.subtracks.data.repo.SourceRepository
+import com.subtracks.playback.PlaybackController
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flatMapLatest
+import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalCoroutinesApi::class)
 class PlaylistDetailViewModel(
     private val libraryRepository: LibraryRepository,
     private val sourceRepository: SourceRepository,
-    playlistId: String,
+    private val playbackController: PlaybackController,
+    private val playlistId: String,
 ) : ViewModel() {
     private val sourceId = libraryRepository.activeSourceId.filterNotNull()
 
@@ -33,4 +37,10 @@ class PlaylistDetailViewModel(
         coverArt: String?,
         thumbnail: Boolean,
     ): CoverArtRef? = sourceRepository.coverArt(coverArt, thumbnail)
+
+    fun play(startIndex: Int) {
+        viewModelScope.launch {
+            playbackController.playPlaylist(sourceId.first(), playlistId, startIndex.toLong())
+        }
+    }
 }

app/src/main/kotlin/com/subtracks/ui/library/SongsContent.kt

@@ -1,14 +1,21 @@
 package com.subtracks.ui.library
 
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.rounded.PlayArrow
+import androidx.compose.material3.Icon
 import androidx.compose.material3.ListItem
 import androidx.compose.material3.ListItemDefaults
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
@@ -61,6 +68,7 @@ fun SongRow(
     song: Song,
     coverArtId: String? = null,
     coverArt: ((String?, Boolean) -> CoverArtRef?)? = null,
+    isPlaying: Boolean = false,
     modifier: Modifier = Modifier,
 ) {
     ListItem(
@@ -77,10 +85,33 @@ fun SongRow(
             } else {
                 null
             },
-        headlineContent = { Text(song.title) },
+        headlineContent = {
+            Row(
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
+                if (isPlaying) {
+                    Icon(
+                        imageVector = Icons.Rounded.PlayArrow,
+                        contentDescription = "Playing",
+                        tint = MaterialTheme.colorScheme.primary,
+                        modifier = Modifier.size(18.dp),
+                    )
+                }
+                Text(
+                    text = song.title,
+                    color = if (isPlaying) MaterialTheme.colorScheme.primary else Color.Unspecified,
+                )
+            }
+        },
         supportingContent = {
             val subtitle = listOfNotNull(song.artist, song.album).joinToString(" • ")
-            if (subtitle.isNotEmpty()) Text(subtitle)
+            if (subtitle.isNotEmpty()) {
+                Text(
+                    text = subtitle,
+                    color = if (isPlaying) MaterialTheme.colorScheme.primary else Color.Unspecified,
+                )
+            }
         },
         colors = ListItemDefaults.colors(containerColor = Color.Transparent),
     )

app/src/main/kotlin/com/subtracks/ui/playback/MiniPlayer.kt

@@ -0,0 +1,112 @@
+package com.subtracks.ui.playback
+
+import androidx.compose.foundation.basicMarquee
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.navigationBarsPadding
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.rounded.Pause
+import androidx.compose.material.icons.rounded.PlayArrow
+import androidx.compose.material.icons.rounded.SkipNext
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.unit.dp
+import com.subtracks.data.model.CoverArtRef
+import com.subtracks.playback.PlaybackState
+import com.subtracks.ui.components.CoverArt
+
+@Composable
+fun MiniPlayer(
+    state: PlaybackState,
+    coverArt: CoverArtRef?,
+    onExpand: () -> Unit,
+    onPlayPause: () -> Unit,
+    onNext: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val item = state.item ?: return
+    Surface(
+        color = MaterialTheme.colorScheme.surfaceContainerHigh,
+        contentColor = MaterialTheme.colorScheme.onSurface,
+        modifier =
+            modifier.fillMaxWidth().clickable(
+                interactionSource = remember { MutableInteractionSource() },
+                indication = null,
+                onClick = onExpand,
+            ),
+    ) {
+        Row(
+            modifier =
+                Modifier
+                    .fillMaxWidth()
+                    .navigationBarsPadding()
+                    .padding(start = 12.dp, end = 4.dp, top = 12.dp, bottom = 12.dp),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(12.dp),
+        ) {
+            CoverArt(
+                ref = coverArt,
+                name = item.title,
+                modifier = Modifier.size(56.dp).clip(RoundedCornerShape(6.dp)),
+            )
+            Column(Modifier.weight(1f)) {
+                Text(
+                    text = item.title,
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurface,
+                    maxLines = 1,
+                    modifier = Modifier.basicMarquee(),
+                )
+                Text(
+                    text = listOfNotNull(item.artist, item.album).joinToString(" • "),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    maxLines = 1,
+                    modifier = Modifier.basicMarquee(),
+                )
+            }
+            Row(verticalAlignment = Alignment.CenterVertically) {
+                IconButton(onClick = onPlayPause, modifier = Modifier.size(56.dp)) {
+                    if (state.isBuffering && state.isPlaying) {
+                        CircularProgressIndicator(
+                            color = MaterialTheme.colorScheme.onSurface,
+                            strokeWidth = 3.dp,
+                            modifier = Modifier.size(28.dp),
+                        )
+                    } else {
+                        Icon(
+                            imageVector = if (state.isPlaying) Icons.Rounded.Pause else Icons.Rounded.PlayArrow,
+                            contentDescription = if (state.isPlaying) "Pause" else "Play",
+                            tint = MaterialTheme.colorScheme.onSurface,
+                            modifier = Modifier.size(42.dp),
+                        )
+                    }
+                }
+                IconButton(onClick = onNext, enabled = state.hasNext, modifier = Modifier.size(56.dp)) {
+                    Icon(
+                        imageVector = Icons.Rounded.SkipNext,
+                        contentDescription = "Next",
+                        tint = MaterialTheme.colorScheme.onSurface,
+                        modifier = Modifier.size(42.dp),
+                    )
+                }
+            }
+        }
+    }
+}

app/src/main/kotlin/com/subtracks/ui/playback/NowPlayingScreen.kt

@@ -0,0 +1,214 @@
+package com.subtracks.ui.playback
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.basicMarquee
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.rounded.ArrowBack
+import androidx.compose.material.icons.rounded.PauseCircle
+import androidx.compose.material.icons.rounded.PlayCircle
+import androidx.compose.material.icons.rounded.SkipNext
+import androidx.compose.material.icons.rounded.SkipPrevious
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Slider
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.subtracks.data.model.CoverArtRef
+import com.subtracks.playback.PlaybackController
+import com.subtracks.playback.PlaybackState
+import com.subtracks.ui.components.CoverArt
+import org.koin.compose.koinInject
+
+@Composable
+fun NowPlayingRoute(
+    onBack: () -> Unit,
+    modifier: Modifier = Modifier,
+    controller: PlaybackController = koinInject(),
+) {
+    val state by controller.state.collectAsStateWithLifecycle()
+    NowPlayingScreen(
+        state = state,
+        coverArt = controller.coverArt(state.item),
+        onBack = onBack,
+        onPlayPause = controller::togglePlayPause,
+        onNext = controller::next,
+        onPrevious = controller::previous,
+        onSeek = controller::seekTo,
+        modifier = modifier,
+    )
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun NowPlayingScreen(
+    state: PlaybackState,
+    coverArt: CoverArtRef?,
+    onBack: () -> Unit,
+    onPlayPause: () -> Unit,
+    onNext: () -> Unit,
+    onPrevious: () -> Unit,
+    onSeek: (Long) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val playButtonSize = 96.dp
+    val playCircleDiameter = playButtonSize * 20f / 24f
+
+    Scaffold(
+        modifier = modifier,
+        topBar = {
+            TopAppBar(
+                title = { Text("Now playing") },
+                navigationIcon = {
+                    IconButton(onClick = onBack) {
+                        Icon(Icons.AutoMirrored.Rounded.ArrowBack, contentDescription = "Back")
+                    }
+                },
+            )
+        },
+    ) { padding ->
+        Column(
+            modifier =
+                Modifier
+                    .padding(padding)
+                    .fillMaxSize()
+                    .padding(horizontal = 24.dp),
+            horizontalAlignment = Alignment.CenterHorizontally,
+        ) {
+            Box(
+                modifier = Modifier.weight(1f).fillMaxWidth().padding(top = 8.dp),
+                contentAlignment = Alignment.Center,
+            ) {
+                CoverArt(
+                    ref = coverArt,
+                    name = state.item?.title.orEmpty(),
+                    modifier =
+                        Modifier
+                            .fillMaxHeight()
+                            .aspectRatio(1f)
+                            .clip(RoundedCornerShape(2.dp)),
+                )
+            }
+            Text(
+                text = state.item?.title.orEmpty(),
+                style = MaterialTheme.typography.headlineSmall,
+                maxLines = 1,
+                modifier = Modifier.padding(top = 28.dp).basicMarquee(),
+            )
+            Text(
+                text = listOfNotNull(state.item?.artist, state.item?.album).joinToString(" • "),
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                maxLines = 1,
+                modifier = Modifier.padding(top = 6.dp).basicMarquee(),
+            )
+            var dragging by remember { mutableStateOf(false) }
+            var dragPosition by remember { mutableFloatStateOf(0f) }
+            Slider(
+                value = if (dragging) dragPosition else state.positionMs.toFloat(),
+                onValueChange = {
+                    dragging = true
+                    dragPosition = it
+                },
+                onValueChangeFinished = {
+                    onSeek(dragPosition.toLong())
+                    dragging = false
+                },
+                valueRange = 0f..state.durationMs.toFloat().coerceAtLeast(1f),
+                enabled = state.durationMs > 0,
+                modifier = Modifier.padding(top = 28.dp),
+            )
+            Row(
+                modifier = Modifier.fillMaxWidth().padding(top = 10.dp),
+                horizontalArrangement = Arrangement.SpaceBetween,
+            ) {
+                Text(formatTime(state.positionMs), style = MaterialTheme.typography.bodySmall)
+                Text(formatTime(state.durationMs), style = MaterialTheme.typography.bodySmall)
+            }
+            if (state.error != null) {
+                Text(
+                    text = state.error,
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.error,
+                    modifier = Modifier.padding(top = 8.dp),
+                )
+            }
+            Row(
+                modifier = Modifier.fillMaxWidth().padding(top = 24.dp, bottom = 32.dp),
+                horizontalArrangement = Arrangement.Center,
+                verticalAlignment = Alignment.CenterVertically,
+            ) {
+                IconButton(onClick = onPrevious, enabled = state.hasPrevious, modifier = Modifier.size(64.dp)) {
+                    Icon(
+                        imageVector = Icons.Rounded.SkipPrevious,
+                        contentDescription = "Previous",
+                        modifier = Modifier.size(48.dp),
+                    )
+                }
+                IconButton(onClick = onPlayPause, modifier = Modifier.padding(horizontal = 20.dp).size(playButtonSize)) {
+                    if (state.isBuffering && state.isPlaying) {
+                        Box(
+                            modifier =
+                                Modifier
+                                    .size(playCircleDiameter)
+                                    .background(MaterialTheme.colorScheme.onBackground, CircleShape),
+                            contentAlignment = Alignment.Center,
+                        ) {
+                            CircularProgressIndicator(
+                                color = MaterialTheme.colorScheme.background,
+                                strokeWidth = 4.dp,
+                                modifier = Modifier.size(playCircleDiameter * 0.65f),
+                            )
+                        }
+                    } else {
+                        Icon(
+                            imageVector = if (state.isPlaying) Icons.Rounded.PauseCircle else Icons.Rounded.PlayCircle,
+                            contentDescription = if (state.isPlaying) "Pause" else "Play",
+                            modifier = Modifier.size(playButtonSize),
+                        )
+                    }
+                }
+                IconButton(onClick = onNext, enabled = state.hasNext, modifier = Modifier.size(64.dp)) {
+                    Icon(
+                        imageVector = Icons.Rounded.SkipNext,
+                        contentDescription = "Next",
+                        modifier = Modifier.size(48.dp),
+                    )
+                }
+            }
+        }
+    }
+}
+
+private fun formatTime(milliseconds: Long): String {
+    val totalSeconds = (milliseconds / 1000).coerceAtLeast(0)
+    val minutes = totalSeconds / 60
+    val seconds = totalSeconds % 60
+    return "%d:%02d".format(minutes, seconds)
+}