address artist detail review findings

app/src/main/kotlin/com/subtracks/data/source/subsonic/SubsonicSource.kt

@@ -6,6 +6,7 @@ import com.subtracks.data.model.Playlist
 import com.subtracks.data.model.PlaylistSong
 import com.subtracks.data.model.Song
 import com.subtracks.data.source.MusicSource
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 
@@ -98,9 +99,13 @@ class SubsonicSource(
         thumbnail: Boolean = false,
     ): String? =
         withContext(Dispatchers.IO) {
-            runCatching {
+            try {
                 SubsonicXml.artistImageUrl(client.get("getArtistInfo2", mapOf("id" to artistId)), thumbnail)
-            }.getOrNull()
+            } catch (e: CancellationException) {
+                throw e
+            } catch (_: Exception) {
+                null
+            }
         }
 
     private fun fetchRanks(): Pair<Map<String, Long>, Map<String, Long>> = fetchRank("frequent") to fetchRank("recent")

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

@@ -2,6 +2,7 @@ package com.subtracks.ui.library
 
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -11,6 +12,7 @@ import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.statusBars
 import androidx.compose.foundation.lazy.grid.GridCells
@@ -94,16 +96,30 @@ fun ArtistDetailScreen(
                 .toDp()
         }
     val statusBarTop = with(density) { WindowInsets.statusBars.getTop(this).toDp() }
+    val navBarBottom = with(density) { WindowInsets.navigationBars.getBottom(this).toDp() }
     val barHeight = statusBarTop + TopAppBarDefaults.TopAppBarExpandedHeight
     val imageTitleTop = ART_HEIGHT - TITLE_INSET - lineHeight
     val fadeStartPx = with(density) { (imageTitleTop - barHeight - FADE_LEAD).toPx() }
     val fadeEndPx = with(density) { (imageTitleTop + lineHeight / 2 - barHeight).toPx() }
-    val barFraction by remember {
+    val barFraction by remember(fadeStartPx, fadeEndPx) {
         derivedStateOf {
-            if (listState.firstVisibleItemIndex > 0) {
-                1f
-            } else {
-                ((listState.firstVisibleItemScrollOffset - fadeStartPx) / (fadeEndPx - fadeStartPx)).coerceIn(0f, 1f)
+            when {
+                listState.layoutInfo.visibleItemsInfo.isEmpty() -> {
+                    0f
+                }
+
+                !listState.canScrollForward -> {
+                    1f
+                }
+
+                listState.firstVisibleItemIndex > 0 -> {
+                    1f
+                }
+
+                else -> {
+                    ((listState.firstVisibleItemScrollOffset - fadeStartPx) / (fadeEndPx - fadeStartPx))
+                        .coerceIn(0f, 1f)
+                }
             }
         }
     }
@@ -118,11 +134,11 @@ fun ArtistDetailScreen(
                 ),
         )
 
-    Box(modifier.fillMaxSize()) {
+    Box(modifier.fillMaxSize().background(MaterialTheme.colorScheme.background)) {
         LazyVerticalGrid(
             state = listState,
             columns = GridCells.Fixed(2),
-            contentPadding = PaddingValues(bottom = 16.dp),
+            contentPadding = PaddingValues(bottom = 16.dp + navBarBottom),
             horizontalArrangement = Arrangement.spacedBy(12.dp),
             verticalArrangement = Arrangement.spacedBy(16.dp),
             modifier = Modifier.fillMaxSize(),
@@ -207,7 +223,14 @@ fun ArtistDetailScreen(
                 }
             },
             colors = TopAppBarDefaults.topAppBarColors(containerColor = Color.Transparent),
-            modifier = Modifier.align(Alignment.TopStart).background(Color.Black.copy(alpha = barFraction)),
+            modifier =
+                Modifier
+                    .align(Alignment.TopStart)
+                    .background(Color.Black.copy(alpha = barFraction))
+                    .clickable(
+                        interactionSource = remember { MutableInteractionSource() },
+                        indication = null,
+                    ) {},
         )
     }
 }

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

@@ -8,11 +8,13 @@ import com.subtracks.data.model.CoverArtRef
 import com.subtracks.data.repo.LibraryRepository
 import com.subtracks.data.repo.SourceRepository
 import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.flow.distinctUntilChangedBy
 import kotlinx.coroutines.flow.filterNotNull
-import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.launch
 
@@ -33,11 +35,22 @@ class ArtistDetailViewModel(
 
     init {
         viewModelScope.launch {
-            val loaded = artist.filterNotNull().first()
-            _art.value = sourceRepository.artistArt(loaded.id) ?: sourceRepository.coverArt(loaded.coverArt)
+            artist
+                .filterNotNull()
+                .distinctUntilChangedBy { it.id }
+                .collectLatest { loaded -> _art.value = resolveArt(loaded) }
         }
     }
 
+    private suspend fun resolveArt(artist: Artist): CoverArtRef? {
+        repeat(3) { attempt ->
+            val ref = sourceRepository.artistArt(artist.id) ?: sourceRepository.coverArt(artist.coverArt)
+            if (ref != null) return ref
+            if (attempt < 2) delay(300)
+        }
+        return null
+    }
+
     fun coverArt(
         coverArt: String?,
         thumbnail: Boolean,