Localized formatting for season and episode display (#1884)

## Description
Added localized formatting for season/episode numbers across the UI
because it was in English-only in every UI language.

### Related issues
None

### Testing
Tested on a physical Google TV Streamer 4K device. Checked manually
relevant screens while browsing and during playback.

## Screenshots
No frontend changes are visible in English and new translations will be
contributed through Weblate for other languages later, as usual.

## AI or LLM usage
Generated initial code with AI, then manually passed over it while
cleaning and refactoring where needed.

---------

Co-authored-by: Damontecres <damontecres@gmail.com>

app/src/main/java/com/github/damontecres/wholphin/data/model/BaseItem.kt

@@ -14,6 +14,7 @@ import com.github.damontecres.wholphin.ui.detail.series.SeasonEpisodeIds
 import com.github.damontecres.wholphin.ui.dot
 import com.github.damontecres.wholphin.ui.formatDateTime
 import com.github.damontecres.wholphin.ui.formatDuration
+import com.github.damontecres.wholphin.ui.formatEpisodeNumber
 import com.github.damontecres.wholphin.ui.getDateFormatter
 import com.github.damontecres.wholphin.ui.joinNotBlank
 import com.github.damontecres.wholphin.ui.nav.Destination
@@ -111,7 +112,7 @@ data class BaseItem(
     val ui =
         BaseItemUi(
             episodeCornerText =
-                data.indexNumber?.let { "E$it" }
+                data.indexNumber?.let { formatEpisodeNumber(it) }
                     ?: data.premiereDate?.let(::formatDateTime),
             episodeUnplayedCornerText =
                 if (type == BaseItemKind.SERIES ||
@@ -119,7 +120,7 @@ data class BaseItem(
                     type == BaseItemKind.EPISODE ||
                     type == BaseItemKind.BOX_SET
                 ) {
-                    data.indexNumber?.let { "E$it" }
+                    data.indexNumber?.let { formatEpisodeNumber(it) }
                         ?: data.userData
                             ?.unplayedItemCount
                             ?.takeIf { it > 0 }

app/src/main/java/com/github/damontecres/wholphin/ui/Formatting.kt

@@ -79,36 +79,74 @@ fun toLocalDate(date: String?): LocalDate? =
         }
     }
 
+// Falls back to the default format if the application is not initialized (e.g. unit tests)
+private fun formatStringWithFallback(
+    @StringRes resId: Int,
+    defaultFormat: String,
+    vararg args: Any,
+): String {
+    val resources =
+        try {
+            WholphinApplication.instance.resources
+        } catch (_: UninitializedPropertyAccessException) {
+            null
+        }
+    return resources?.getString(resId, *args)
+        ?: String.format(Locale.getDefault(), defaultFormat, *args)
+}
+
 /**
- * If the item has season & episode info, format as `S# E#`
+ * Format season & episode numbers using localized string resources.
+ * Returns null if [season] or [episode] is missing.
+ */
+fun formatSeasonEpisode(
+    season: Int?,
+    episode: Int?,
+    episodeEnd: Int? = null,
+    padded: Boolean = false,
+): String? {
+    if (season == null || episode == null) return null
+    return if (episodeEnd != null) {
+        if (padded) {
+            formatStringWithFallback(R.string.season_episode_number_padded_range, "S%1\$02dE%2\$02d-E%3\$02d", season, episode, episodeEnd)
+        } else {
+            formatStringWithFallback(R.string.season_episode_number_range, "S%1\$d E%2\$d-E%3\$d", season, episode, episodeEnd)
+        }
+    } else if (padded) {
+        formatStringWithFallback(R.string.season_episode_number_padded, "S%1\$02dE%2\$02d", season, episode)
+    } else {
+        formatStringWithFallback(R.string.season_episode_number, "S%1\$d E%2\$d", season, episode)
+    }
+}
+
+/** Compact episode-only label, e.g. `E3`. */
+fun formatEpisodeNumber(episode: Int): String = formatStringWithFallback(R.string.episode_number_short, "E%1\$d", episode)
+
+/** Fallback season title when the library has no season name, e.g. `Season 2`. */
+fun formatSeasonNumber(season: Int): String = formatStringWithFallback(R.string.season_number, "Season %1\$d", season)
+
+/**
+ * If the item has season & episode info, format as localized `S# E#`
  */
 val BaseItemDto.seasonEpisode: String?
     get() =
-        if (parentIndexNumber != null && indexNumber != null && indexNumberEnd != null) {
-            "S$parentIndexNumber E$indexNumber-E$indexNumberEnd"
-        } else if (parentIndexNumber != null && indexNumber != null) {
-            "S$parentIndexNumber E$indexNumber"
-        } else {
-            null
-        }
+        formatSeasonEpisode(
+            parentIndexNumber,
+            indexNumber,
+            indexNumberEnd,
+        )
 
 /**
- * If the item has season & episode info, format padded as `S## E##`
+ * If the item has season & episode info, format padded as localized `S##E##`
  */
 val BaseItemDto.seasonEpisodePadded: String?
     get() =
-        if (parentIndexNumber != null && indexNumber != null) {
-            val season = parentIndexNumber?.toString()?.padStart(2, '0')
-            val episode = indexNumber?.toString()?.padStart(2, '0')
-            val endEpisode = indexNumberEnd?.toString()?.padStart(2, '0')
-            if (endEpisode != null) {
-                "S${season}E$episode-E$endEpisode"
-            } else {
-                "S${season}E$episode"
-            }
-        } else {
-            null
-        }
+        formatSeasonEpisode(
+            parentIndexNumber,
+            indexNumber,
+            indexNumberEnd,
+            padded = true,
+        )
 
 val BaseItemDto.seriesProductionYears: String?
     get() =
@@ -274,6 +312,7 @@ fun Resources.formatDuration(duration: Duration): String =
         when {
             hours > 0 && minutes > 0 && seconds > 0 -> getString(R.string.duration_hours_minutes_seconds, hours.toInt(), minutes, seconds)
             hours > 0 && minutes > 0 -> getString(R.string.duration_hours_minutes, hours.toInt(), minutes)
+            hours > 0 && seconds > 0 -> getString(R.string.duration_hours_seconds, hours.toInt(), seconds)
             hours > 0 -> getString(R.string.duration_hours, hours.toInt())
             minutes > 0 && seconds > 0 -> getString(R.string.duration_minutes_seconds, minutes, seconds)
             minutes > 0 -> getString(R.string.duration_minutes, minutes)

app/src/main/java/com/github/damontecres/wholphin/ui/detail/discover/RequestSeasons.kt

@@ -46,6 +46,7 @@ import com.github.damontecres.wholphin.ui.cards.PendingIndicator
 import com.github.damontecres.wholphin.ui.components.BasicDialog
 import com.github.damontecres.wholphin.ui.components.ErrorMessage
 import com.github.damontecres.wholphin.ui.components.LoadingPage
+import com.github.damontecres.wholphin.ui.formatSeasonNumber
 import com.github.damontecres.wholphin.ui.theme.WholphinTheme
 import com.github.damontecres.wholphin.ui.tryRequestFocus
 import com.github.damontecres.wholphin.util.LoadingState
@@ -277,7 +278,8 @@ fun SeasonListItem(
             Text(
                 text =
                     season.season.name
-                        ?: (stringResource(R.string.tv_season) + " ${season.season.seasonNumber}"),
+                        ?: season.season.seasonNumber?.let { formatSeasonNumber(it) }
+                        ?: "",
             )
         },
         supportingContent = {

app/src/main/java/com/github/damontecres/wholphin/ui/detail/livetv/Components.kt

@@ -29,6 +29,7 @@ import androidx.tv.material3.surfaceColorAtElevation
 import coil3.compose.AsyncImage
 import com.github.damontecres.wholphin.R
 import com.github.damontecres.wholphin.ui.FontAwesome
+import com.github.damontecres.wholphin.ui.formatSeasonEpisode
 import java.time.LocalDateTime
 
 @Composable
@@ -109,10 +110,15 @@ fun Program(
                     overflow = TextOverflow.Ellipsis,
                     modifier = Modifier,
                 )
+                val seasonEpisodeLabel =
+                    formatSeasonEpisode(
+                        program.seasonEpisode?.season,
+                        program.seasonEpisode?.episode,
+                    )
                 val subtitle =
-                    remember(program) {
+                    remember(program, seasonEpisodeLabel) {
                         listOfNotNull(
-                            program.seasonEpisode?.let { "S${it.season} E${it.episode}" },
+                            seasonEpisodeLabel,
                             program.subtitle,
                         ).joinToString(" - ").ifBlank { null }
                     }

app/src/main/java/com/github/damontecres/wholphin/ui/detail/livetv/LiveTvViewModel.kt

@@ -22,6 +22,7 @@ import com.github.damontecres.wholphin.ui.data.RowColumn
 import com.github.damontecres.wholphin.ui.detail.series.SeasonEpisode
 import com.github.damontecres.wholphin.ui.dot
 import com.github.damontecres.wholphin.ui.formatDuration
+import com.github.damontecres.wholphin.ui.formatSeasonEpisode
 import com.github.damontecres.wholphin.ui.isNotNullOrBlank
 import com.github.damontecres.wholphin.ui.launchDefault
 import com.github.damontecres.wholphin.ui.launchIO
@@ -636,7 +637,7 @@ data class TvProgram(
                         .roundMinutes
                         .let { append(resources.getString(R.string.time_left, resources.formatDuration(it))) }
                 }
-                seasonEpisode?.let { "S${it.season} E${it.episode}" }?.let {
+                formatSeasonEpisode(seasonEpisode?.season, seasonEpisode?.episode)?.let {
                     dot()
                     append(it)
                 }

app/src/main/java/com/github/damontecres/wholphin/ui/detail/series/SeriesOverviewContent.kt

@@ -42,7 +42,6 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.graphicsLayer
 import androidx.compose.ui.input.key.onKeyEvent
 import androidx.compose.ui.input.nestedscroll.nestedScroll
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import com.github.damontecres.wholphin.R
 import com.github.damontecres.wholphin.data.ChosenStreams
@@ -60,6 +59,7 @@ import com.github.damontecres.wholphin.ui.components.LoadingPage
 import com.github.damontecres.wholphin.ui.components.TabDetails
 import com.github.damontecres.wholphin.ui.components.TabRow
 import com.github.damontecres.wholphin.ui.components.TitleOrLogo
+import com.github.damontecres.wholphin.ui.formatSeasonNumber
 import com.github.damontecres.wholphin.ui.ifElse
 import com.github.damontecres.wholphin.ui.logTab
 import com.github.damontecres.wholphin.ui.playback.isPlayKeyUp
@@ -121,7 +121,6 @@ fun SeriesOverviewContent(
     val scrollConnection = rememberDelayedNestedScroll()
     var requestFocusAfterSeason by remember { mutableStateOf(false) }
 
-    val seasonStr = stringResource(R.string.tv_season)
     val tabFocusRequesters = remember(seasons) { List(seasons.size) { FocusRequester() } }
     val contentFocusRequesters = remember(seasons) { List(seasons.size) { FocusRequester() } }
     val tabs =
@@ -130,7 +129,7 @@ fun SeriesOverviewContent(
                 title =
                     StringStringProvider(
                         season?.name
-                            ?: season?.data?.indexNumber?.let { "$seasonStr $it" }
+                            ?: season?.data?.indexNumber?.let { formatSeasonNumber(it) }
                             ?: "",
                     ),
                 tabFocusRequester = tabFocusRequesters[index],

app/src/main/res/values/strings.xml

@@ -28,6 +28,7 @@
     <string name="decimal_seconds">%.2f seconds</string>
     <string name="duration_hours_minutes_seconds">%1$dh %2$dm %3$ds</string>
     <string name="duration_hours_minutes">%1$dh %2$dm</string>
+    <string name="duration_hours_seconds">%1$dh %2$ds</string>
     <string name="duration_minutes_seconds">%1$dm %2$ds</string>
     <string name="duration_hours">%1$dh</string>
     <string name="duration_minutes">%1$dm</string>
@@ -158,6 +159,12 @@
     <string name="tv_guide">Guide</string>
     <string name="tv_season">Season</string>
     <string name="tv_seasons">Seasons</string>
+    <string name="season_episode_number">S%1$d E%2$d</string>
+    <string name="season_episode_number_range">S%1$d E%2$d-E%3$d</string>
+    <string name="season_episode_number_padded">S%1$02dE%2$02d</string>
+    <string name="season_episode_number_padded_range">S%1$02dE%2$02d-E%3$02d</string>
+    <string name="episode_number_short">E%1$d</string>
+    <string name="season_number">Season %1$d</string>
     <string name="tv_shows_title">TV Shows</string>
     <string name="ui_interface">Interface</string>
     <string name="unknown">Unknown</string>