feat(series): improve season and episode loading handling

app/src/main/java/hu/bbara/purefin/ui/screen/series/SeriesScreen.kt

@@ -87,7 +87,7 @@ fun SeriesScreen(
     }
 
     val seriesData = seriesState.value
-    if (seriesData != null && seriesData.seasons.isNotEmpty()) {
+    if (seriesData != null) {
         LaunchedEffect(seriesData) {
             viewModel.observeSeriesDownloadState(seriesData)
         }
@@ -170,22 +170,22 @@ private fun SeriesScreenInternal(
 ) {
     val scheme = MaterialTheme.colorScheme
 
-    fun getDefaultSeason(): Season {
-        return series.seasons.firstOrNull { it.unwatchedEpisodeCount > 0 } ?: series.seasons.first()
+    fun getDefaultSeason(): Season? {
+        return series.seasons.firstOrNull { it.unwatchedEpisodeCount > 0 } ?: series.seasons.firstOrNull()
     }
 
-    var selectedSeasonId by remember(series.id) { mutableStateOf(getDefaultSeason().id) }
+    var selectedSeasonId by remember(series.id) { mutableStateOf(getDefaultSeason()?.id) }
     val selectedSeason =
         series.seasons.firstOrNull { it.id == selectedSeasonId } ?: getDefaultSeason()
-    val nextUpEpisode = selectedSeason.episodes.firstOrNull { !it.watched }
-        ?: selectedSeason.episodes.firstOrNull()
+    val nextUpEpisode = selectedSeason?.episodes?.firstOrNull { !it.watched }
+        ?: selectedSeason?.episodes?.firstOrNull()
 
-    LaunchedEffect(series.id, selectedSeason.id) {
-        onLoadSeasonEpisodes(series.id, selectedSeason.id)
+    LaunchedEffect(series.id, selectedSeason?.id) {
+        selectedSeason?.let { onLoadSeasonEpisodes(series.id, it.id) }
     }
 
-    LaunchedEffect(selectedSeason.id, selectedSeason.episodes) {
-        onObserveSeasonDownloadState(selectedSeason.episodes)
+    LaunchedEffect(selectedSeason?.id, selectedSeason?.episodes) {
+        selectedSeason?.let { onObserveSeasonDownloadState(it.episodes) }
     }
 
     MediaDetailScaffold(
@@ -198,17 +198,19 @@ private fun SeriesScreenInternal(
             SeriesHeroContent(series = series)
         }
     ) {
-        SeriesActionButtons(
-            nextUpEpisode = nextUpEpisode,
-            selectedSeason = selectedSeason,
-            seriesDownloadState = seriesDownloadState,
-            seasonDownloadState = seasonDownloadState,
-            isSmartDownloadEnabled = isSmartDownloadEnabled,
-            offline = offline,
-            onDownloadOptionSelected = { option ->
-                onDownloadOptionSelected(option, selectedSeason)
-            }
-        )
+        if (selectedSeason != null) {
+            SeriesActionButtons(
+                nextUpEpisode = nextUpEpisode,
+                selectedSeason = selectedSeason,
+                seriesDownloadState = seriesDownloadState,
+                seasonDownloadState = seasonDownloadState,
+                isSmartDownloadEnabled = isSmartDownloadEnabled,
+                offline = offline,
+                onDownloadOptionSelected = { option ->
+                    onDownloadOptionSelected(option, selectedSeason)
+                }
+            )
+        }
         MediaSynopsis(
             synopsis = series.synopsis,
             bodyColor = scheme.onSurface,
@@ -216,14 +218,22 @@ private fun SeriesScreenInternal(
             bodyLineHeight = null,
             titleSpacing = 8.dp
         )
-        SeasonTabs(
-            seasons = series.seasons,
-            selectedSeason = selectedSeason,
-            onSelect = { selectedSeasonId = it.id }
-        )
-        EpisodeCarousel(
-            episodes = selectedSeason.episodes,
-        )
+        if (selectedSeason != null) {
+            SeasonTabs(
+                seasons = series.seasons,
+                selectedSeason = selectedSeason,
+                onSelect = { selectedSeasonId = it.id }
+            )
+            EpisodeCarousel(
+                episodes = selectedSeason.episodes,
+            )
+        } else {
+            Text(
+                text = "Loading seasons...",
+                color = scheme.onSurfaceVariant,
+                fontSize = 13.sp
+            )
+        }
         if (series.cast.isNotEmpty()) {
             Text(
                 text = "Cast",

app/src/main/java/hu/bbara/purefin/ui/screen/series/components/SeriesComponents.kt

@@ -4,7 +4,6 @@ import android.content.Intent
 import androidx.compose.foundation.background
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
-import androidx.compose.foundation.horizontalScroll
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -20,8 +19,8 @@ import androidx.compose.foundation.layout.sizeIn
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyRow
 import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.lazy.rememberLazyListState
-import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.outlined.Add
@@ -333,14 +332,23 @@ internal fun SeasonTabs(
     modifier: Modifier = Modifier,
     onSelect: (Season) -> Unit
 ) {
-    Row(
+    val selectedSeasonIndex = seasons.indexOf(selectedSeason).coerceAtLeast(0)
+    val listState = rememberLazyListState()
+
+    LaunchedEffect(selectedSeasonIndex, seasons.size) {
+        if (seasons.isNotEmpty()) {
+            listState.scrollToItem(selectedSeasonIndex)
+        }
+    }
+
+    LazyRow(
+        state = listState,
         modifier = modifier
-            .fillMaxWidth()
-            .horizontalScroll(rememberScrollState()),
+            .fillMaxWidth(),
         horizontalArrangement = Arrangement.spacedBy(20.dp),
         verticalAlignment = Alignment.CenterVertically
     ) {
-        seasons.forEachIndexed { index, season ->
+        itemsIndexed(seasons, key = { _, season -> season.id }) { index, season ->
             SeasonTab(
                 name = season.name,
                 isSelected = season == selectedSeason,