search: list playlists before artists, albums and songs

Order the result sections smallest-first and apply the review fixes: pad
the filter bar for the navigation bar, keep at least one filter enabled,
hide the clear button on an empty field, drop the unused autoFocus and
bar-modifier parameters, and test the filter mask and section order.

app/src/main/kotlin/com/subtracks/ui/components/SearchField.kt

@@ -39,11 +39,11 @@ fun SearchField(
     onClose: () -> Unit,
     focusRequester: FocusRequester,
     modifier: Modifier = Modifier,
-    autoFocus: Boolean = true,
+    showClose: Boolean = true,
 ) {
     val hint = stringResource(R.string.search_input_placeholder)
     val closeLabel = stringResource(R.string.close_search)
-    LaunchedEffect(autoFocus) { if (autoFocus) focusRequester.requestFocus() }
+    LaunchedEffect(Unit) { focusRequester.requestFocus() }
     Surface(
         shape = RoundedCornerShape(8.dp),
         color = MaterialTheme.colorScheme.surfaceContainerHigh,
@@ -85,12 +85,14 @@ fun SearchField(
                     inner()
                 },
             )
-            IconButton(onClick = onClose) {
-                Icon(
-                    imageVector = Icons.Rounded.Close,
-                    contentDescription = closeLabel,
-                    modifier = Modifier.size(20.dp),
-                )
+            if (showClose) {
+                IconButton(onClick = onClose) {
+                    Icon(
+                        imageVector = Icons.Rounded.Close,
+                        contentDescription = closeLabel,
+                        modifier = Modifier.size(20.dp),
+                    )
+                }
             }
         }
     }

app/src/main/kotlin/com/subtracks/ui/search/SearchScreen.kt

@@ -8,6 +8,7 @@ import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.navigationBarsPadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListScope
@@ -98,7 +99,10 @@ fun SearchRoute(
         onQueryChange = viewModel::setQuery,
         results = results,
         filters = maskToFilters(filterMask),
-        onToggleFilter = { filterMask = filterMask xor (1 shl it.ordinal) },
+        onToggleFilter = { filter ->
+            val next = filterMask xor (1 shl filter.ordinal)
+            if (next != 0) filterMask = next
+        },
         coverArt = viewModel::coverArt,
         playingSongId = playback.item?.id,
         onBack = onBack,
@@ -110,9 +114,10 @@ fun SearchRoute(
     )
 }
 
-private fun allFilterMask(): Int = SearchFilter.entries.fold(0) { mask, filter -> mask or (1 shl filter.ordinal) }
+internal fun allFilterMask(): Int = SearchFilter.entries.fold(0) { mask, filter -> mask or (1 shl filter.ordinal) }
 
-private fun maskToFilters(mask: Int): Set<SearchFilter> = SearchFilter.entries.filterTo(mutableSetOf()) { mask and (1 shl it.ordinal) != 0 }
+internal fun maskToFilters(mask: Int): Set<SearchFilter> =
+    SearchFilter.entries.filterTo(mutableSetOf()) { mask and (1 shl it.ordinal) != 0 }
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -158,6 +163,7 @@ fun SearchScreen(
                         onValueChange = onQueryChange,
                         onClose = { onQueryChange("") },
                         focusRequester = focusRequester,
+                        showClose = query.isNotEmpty(),
                         modifier = Modifier.fillMaxWidth().padding(vertical = 8.dp),
                     )
                 },
@@ -191,10 +197,10 @@ fun SearchScreen(
                     modifier = Modifier.fillMaxSize().padding(padding),
                     contentPadding = PaddingValues(bottom = 24.dp),
                 ) {
-                    if (showSongs) songResults(results.songs, songsLabel, coverArt, playingSongId, onSongClick, onLongClick)
-                    if (showAlbums) albumResults(results.albums, albumsLabel, coverArt, onAlbumClick, onLongClick)
-                    if (showArtists) artistResults(results.artists, artistsLabel, coverArt, onArtistClick, onLongClick)
                     if (showPlaylists) playlistResults(results.playlists, playlistsLabel, coverArt, onPlaylistClick, onLongClick)
+                    if (showArtists) artistResults(results.artists, artistsLabel, coverArt, onArtistClick, onLongClick)
+                    if (showAlbums) albumResults(results.albums, albumsLabel, coverArt, onAlbumClick, onLongClick)
+                    if (showSongs) songResults(results.songs, songsLabel, coverArt, playingSongId, onSongClick, onLongClick)
                 }
             }
         }
@@ -205,12 +211,12 @@ fun SearchScreen(
 private fun SearchFilterBar(
     filters: Set<SearchFilter>,
     onToggle: (SearchFilter) -> Unit,
-    modifier: Modifier = Modifier,
 ) {
     Row(
         modifier =
-            modifier
+            Modifier
                 .fillMaxWidth()
+                .navigationBarsPadding()
                 .horizontalScroll(rememberScrollState())
                 .padding(horizontal = 12.dp, vertical = 8.dp),
         horizontalArrangement = Arrangement.spacedBy(8.dp),

app/src/test/kotlin/com/subtracks/ui/search/SearchScreenTest.kt

@@ -14,6 +14,7 @@ import com.subtracks.data.model.Playlist
 import com.subtracks.data.model.Song
 import com.subtracks.ui.theme.SubtracksTheme
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
 import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
@@ -147,6 +148,59 @@ class SearchScreenTest {
         assertEquals(SearchFilter.Playlists, toggled)
     }
 
+    @Test
+    fun smallerGroupsAreListedFirst() {
+        composeRule.setContent {
+            SubtracksTheme {
+                SearchScreen(
+                    query = "road",
+                    onQueryChange = {},
+                    results =
+                        SearchResults(
+                            albums = listOf(album("al-1", "Road Album")),
+                            artists = listOf(artist("ar-1", "Road Artist")),
+                            playlists = listOf(playlist("pl-1", "Road Trip")),
+                            songs = listOf(AlbumSongItem(song("s1", "Road Song"), coverArt = null)),
+                        ),
+                )
+            }
+        }
+
+        val playlistTop =
+            composeRule
+                .onNodeWithText("Road Trip")
+                .fetchSemanticsNode()
+                .boundsInRoot.top
+        val artistTop =
+            composeRule
+                .onNodeWithText("Road Artist")
+                .fetchSemanticsNode()
+                .boundsInRoot.top
+        val albumTop =
+            composeRule
+                .onNodeWithText("Road Album")
+                .fetchSemanticsNode()
+                .boundsInRoot.top
+        val songTop =
+            composeRule
+                .onNodeWithText("Road Song")
+                .fetchSemanticsNode()
+                .boundsInRoot.top
+
+        assertTrue("playlists should come first", playlistTop < artistTop)
+        assertTrue("artists should come before albums", artistTop < albumTop)
+        assertTrue("albums should come before songs", albumTop < songTop)
+    }
+
+    @Test
+    fun filterMaskRoundTrips() {
+        assertEquals(SearchFilter.entries.toSet(), maskToFilters(allFilterMask()))
+
+        val withoutSongs = allFilterMask() and (1 shl SearchFilter.Songs.ordinal).inv()
+
+        assertEquals(SearchFilter.entries.toSet() - SearchFilter.Songs, maskToFilters(withoutSongs))
+    }
+
     private fun album(
         id: String,
         name: String,