Started work on GUI

.idea/deploymentTargetSelector.xml

@@ -4,10 +4,10 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
-        <DropdownSelection timestamp="2026-06-23T06:48:40.641060889Z">
+        <DropdownSelection timestamp="2026-06-23T07:28:08.761449449Z">
           <Target type="DEFAULT_BOOT">
             <handle>
-              <DeviceId pluginId="LocalEmulator" identifier="path=/home/sylar/.android/avd/Medium_Phone.avd" />
+              <DeviceId pluginId="PhysicalDevice" identifier="serial=RFCY20YA30P" />
             </handle>
           </Target>
         </DropdownSelection>

.idea/planningMode.xml

@@ -4,6 +4,7 @@
     <option name="approvalStates">
       <map>
         <entry key="20260623-075402-8a5368e9-a150-4048-aaa6-a07699e3c266" value="true" />
+        <entry key="20260623-091803-ac498ab1-c280-469b-a10f-4e7d5a828aea" value="true" />
       </map>
     </option>
   </component>

app/build.gradle.kts

@@ -90,4 +90,6 @@ dependencies {
     androidTestImplementation(libs.androidx.junit)
     debugImplementation(libs.androidx.compose.ui.test.manifest)
     debugImplementation(libs.androidx.compose.ui.tooling)
+
+    implementation(libs.androidx.compose.material.icons.core)
 }

app/src/main/java/com/keylightpiano/pianotimeline/MainActivity.kt

@@ -4,14 +4,8 @@ import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.padding
-import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.tooling.preview.Preview
 import com.keylightpiano.pianotimeline.ui.theme.PianoTimelineTheme
+import com.keylightpiano.pianotimeline.ui.RecordingListScreen
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -19,28 +13,8 @@ class MainActivity : ComponentActivity() {
         enableEdgeToEdge()
         setContent {
             PianoTimelineTheme {
-                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
+                RecordingListScreen()
-                    TestScreen(
-                        modifier = Modifier.padding(innerPadding)
-                    )
-                }
             }
         }
     }
 }
-
-@Composable
-fun Greeting(name: String, modifier: Modifier = Modifier) {
-    Text(
-        text = "Hello $name!",
-        modifier = modifier
-    )
-}
-
-@Preview(showBackground = true)
-@Composable
-fun GreetingPreview() {
-    PianoTimelineTheme {
-        Greeting("Android")
-    }
-}

app/src/main/java/com/keylightpiano/pianotimeline/TestScreen.kt

@@ -1,71 +0,0 @@
-package com.keylightpiano.pianotimeline
-
-import androidx.compose.foundation.layout.Arrangement
-import androidx.compose.foundation.layout.Box
-import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.items
-import androidx.compose.material3.Button
-import androidx.compose.material3.CircularProgressIndicator
-import androidx.compose.material3.HorizontalDivider
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Text
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.unit.dp
-import androidx.lifecycle.compose.collectAsStateWithLifecycle
-import androidx.lifecycle.viewmodel.compose.viewModel
-
-@Composable
-fun TestScreen(modifier: Modifier = Modifier) {
-    val vm: TestViewModel = viewModel()
-    // collectAsStateWithLifecycle bridges the StateFlow into Compose:
-    // the UI recomposes automatically whenever the state changes.
-    val state by vm.state.collectAsStateWithLifecycle()
-
-    Box(modifier = modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
-        when (val s = state) {
-            is FetchState.Loading -> CircularProgressIndicator()
-
-            is FetchState.Error -> Column(
-                horizontalAlignment = Alignment.CenterHorizontally,
-                verticalArrangement = Arrangement.spacedBy(12.dp),
-                modifier = Modifier.padding(24.dp)
-            ) {
-                Text("Fetch failed", style = MaterialTheme.typography.titleMedium)
-                Text(s.message, style = MaterialTheme.typography.bodySmall)
-                Button(onClick = { vm.load() }) { Text("Retry") }
-            }
-
-            is FetchState.Success -> Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
-                Text(
-                    "revision ${s.revision} — ${s.recordings.size} recordings",
-                    style = MaterialTheme.typography.titleMedium,
-                    fontWeight = FontWeight.Bold
-                )
-                HorizontalDivider(modifier = Modifier.padding(vertical = 8.dp))
-                LazyColumn(verticalArrangement = Arrangement.spacedBy(6.dp)) {
-                    items(s.recordings) { r ->
-                        Column {
-                            Text(
-                                "${r.artist} — ${r.title}",
-                                style = MaterialTheme.typography.bodyMedium,
-                                fontWeight = FontWeight.SemiBold
-                            )
-                            Text(
-                                "${r.date}  ·  ${r.formattedDuration}  ·  ${r.performanceLabel}" +
-                                    if (r.hasMidi) "  ·  MIDI" else "",
-                                style = MaterialTheme.typography.bodySmall
-                            )
-                        }
-                    }
-                }
-            }
-        }
-    }
-}

app/src/main/java/com/keylightpiano/pianotimeline/TestViewModel.kt

@@ -1,50 +0,0 @@
-package com.keylightpiano.pianotimeline
-
-import android.app.Application
-import androidx.lifecycle.AndroidViewModel
-import androidx.lifecycle.viewModelScope
-import com.keylightpiano.pianotimeline.data.MusicRepository
-import com.keylightpiano.pianotimeline.data.SyncManager
-import com.keylightpiano.pianotimeline.domain.Recording
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.launch
-
-class TestViewModel(app: Application) : AndroidViewModel(app) {
-
-    private val repo = MusicRepository(app)
-    private val syncManager = SyncManager(app)
-
-    private val _state = MutableStateFlow<FetchState>(FetchState.Loading)
-    val state: StateFlow<FetchState> = _state.asStateFlow()
-
-    init {
-        load()
-    }
-
-    fun load() {
-        _state.value = FetchState.Loading
-        viewModelScope.launch {
-            // Sync first (updates Room), then observe from Room
-            val result = syncManager.sync()
-            try {
-                // One-shot collect to get current list for the test screen
-                repo.observeRecordings().collect { recordings ->
-                    _state.value = FetchState.Success(
-                        revision = syncManager.getCachedRevision(),
-                        recordings = recordings
-                    )
-                }
-            } catch (e: Exception) {
-                _state.value = FetchState.Error(e.message ?: e.toString())
-            }
-        }
-    }
-}
-
-sealed interface FetchState {
-    data object Loading : FetchState
-    data class Success(val revision: Int, val recordings: List<Recording>) : FetchState
-    data class Error(val message: String) : FetchState
-}

app/src/main/java/com/keylightpiano/pianotimeline/domain/Recording.kt

@@ -1,6 +1,8 @@
 package com.keylightpiano.pianotimeline.domain
 
 import java.time.LocalDate
+import java.time.format.DateTimeFormatter
+import java.util.Locale
 
 /**
  * The clean, app-facing model. Real types, sane defaults, computed helpers.
@@ -23,6 +25,10 @@ data class Recording(
     /** True when there's a MIDI file → the "Notes" button should appear. */
     val hasMidi: Boolean get() = midiFileName != null
 
+    /** "22 Jun 2026" style for display. */
+    val formattedDate: String
+        get() = date.format(DateTimeFormatter.ofPattern("d MMM yyyy", Locale.ENGLISH))
+
     /**
      * Artist used for grouping / filtering only.
      * Anything containing "soundtrack" (case-insensitive) collapses to "Soundtracks".

app/src/main/java/com/keylightpiano/pianotimeline/ui/RecordingItem.kt

@@ -0,0 +1,136 @@
+package com.keylightpiano.pianotimeline.ui
+
+import androidx.compose.foundation.basicMarquee
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.FilledTonalIconButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import com.keylightpiano.pianotimeline.domain.Recording
+
+@Composable
+fun RecordingItem(
+    recording: Recording,
+    onPlayClick: () -> Unit,
+    onNotesClick: (() -> Unit)?,
+    modifier: Modifier = Modifier
+) {
+    Card(
+        modifier = modifier.fillMaxWidth(),
+        colors = CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.surface
+        ),
+        elevation = CardDefaults.cardElevation(defaultElevation = 1.dp)
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(horizontal = 12.dp, vertical = 10.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            // Play button
+            FilledTonalIconButton(
+                onClick = onPlayClick,
+                modifier = Modifier.size(44.dp)
+            ) {
+                Icon(
+                    painter = painterResource(android.R.drawable.ic_media_play),
+                    contentDescription = "Play",
+                    modifier = Modifier.size(22.dp)
+                )
+            }
+
+            Spacer(Modifier.width(12.dp))
+
+            // Text content
+            Column(modifier = Modifier.weight(1f)) {
+                // Artist
+                Text(
+                    text = recording.artist,
+                    style = MaterialTheme.typography.labelMedium,
+                    color = Color(0xFFE6A900),
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis
+                )
+                // Title — marquee scrolls when it doesn't fit
+                Text(
+                    text = recording.title,
+                    style = MaterialTheme.typography.bodyLarge,
+                    fontWeight = FontWeight.Medium,
+                    maxLines = 1,
+                    modifier = Modifier.basicMarquee(
+                        iterations = Int.MAX_VALUE,
+                        repeatDelayMillis = 2000,       // pause before starting to scroll
+                        initialDelayMillis = 3000, // pause on first appearance
+                        velocity = 30.dp           // scroll speed
+                    )
+                )
+                // Metadata row
+                Row(
+                    horizontalArrangement = Arrangement.spacedBy(8.dp),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(
+                        text = recording.formattedDate,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = Color(0xFFA3D1FF)
+                    )
+                    Text(
+                        text = "·",
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                    Text(
+                        text = recording.formattedDuration,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = Color(0xFFA3FFBC)
+                    )
+                    Text(
+                        text = "·",
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                    Text(
+                        text = recording.performanceLabel,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = Color(0xFF999999)
+                    )
+                }
+            }
+
+            // Notes button (only if MIDI exists)
+            if (onNotesClick != null) {
+                Spacer(Modifier.width(8.dp))
+                OutlinedButton(
+                    onClick = onNotesClick,
+                    modifier = Modifier.size(width = 60.dp, height = 32.dp),
+                    contentPadding = PaddingValues(0.dp)
+                ) {
+                    Text(
+                        "Notes",
+                        style = MaterialTheme.typography.labelSmall
+                    )
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/keylightpiano/pianotimeline/ui/RecordingListScreen.kt

@@ -0,0 +1,290 @@
+package com.keylightpiano.pianotimeline.ui
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.expandVertically
+import androidx.compose.animation.shrinkVertically
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Clear
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.material3.Button
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FilterChip
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import androidx.lifecycle.viewmodel.compose.viewModel
+
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalLayoutApi::class)
+@Composable
+fun RecordingListScreen(
+    modifier: Modifier = Modifier,
+    vm: RecordingListViewModel = viewModel()
+) {
+    val syncState by vm.syncState.collectAsStateWithLifecycle()
+    val recordings by vm.recordings.collectAsStateWithLifecycle()
+    val searchQuery by vm.searchQuery.collectAsStateWithLifecycle()
+    val sortMode by vm.sortMode.collectAsStateWithLifecycle()
+    val hiddenArtists by vm.hiddenArtists.collectAsStateWithLifecycle()
+    val availableArtists by vm.availableArtists.collectAsStateWithLifecycle()
+
+    var showControls by rememberSaveable { mutableStateOf(false) }
+    var showSortMenu by remember { mutableStateOf(false) }
+    var showArtistFilter by rememberSaveable { mutableStateOf(false) }
+
+    val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
+
+    // Whether any filter is active — used to tint the search icon
+    val hasActiveFilter = searchQuery.isNotEmpty() || hiddenArtists.isNotEmpty()
+
+    Scaffold(
+        modifier = modifier.nestedScroll(scrollBehavior.nestedScrollConnection),
+        topBar = {
+            TopAppBar(
+                title = {
+                    Text(
+                        "Piano Timeline",
+                        fontWeight = FontWeight.Bold
+                    )
+                },
+                actions = {
+                    IconButton(onClick = { showControls = !showControls }) {
+                        Icon(
+                            imageVector = Icons.Default.Search,
+                            contentDescription = "Search & Filter",
+                            tint = if (hasActiveFilter) MaterialTheme.colorScheme.primary
+                                   else MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                },
+                scrollBehavior = scrollBehavior
+            )
+        }
+    ) { innerPadding ->
+        when (val s = syncState) {
+            is SyncState.Syncing -> {
+                Box(
+                    Modifier.fillMaxSize().padding(innerPadding),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Column(horizontalAlignment = Alignment.CenterHorizontally) {
+                        CircularProgressIndicator()
+                        Spacer(Modifier.height(12.dp))
+                        Text("Syncing…", style = MaterialTheme.typography.bodyMedium)
+                    }
+                }
+            }
+
+            is SyncState.Error -> {
+                Box(
+                    Modifier.fillMaxSize().padding(innerPadding),
+                    contentAlignment = Alignment.Center
+                ) {
+                    Column(
+                        horizontalAlignment = Alignment.CenterHorizontally,
+                        verticalArrangement = Arrangement.spacedBy(12.dp),
+                        modifier = Modifier.padding(24.dp)
+                    ) {
+                        Text("Couldn't load recordings", style = MaterialTheme.typography.titleMedium)
+                        Text(s.message, style = MaterialTheme.typography.bodySmall)
+                        Button(onClick = { vm.retry() }) { Text("Retry") }
+                    }
+                }
+            }
+
+            is SyncState.Ready -> {
+                Column(
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .padding(innerPadding)
+                ) {
+                    // ── Collapsible search + filter + sort block ───
+                    AnimatedVisibility(
+                        visible = showControls,
+                        enter = expandVertically(),
+                        exit = shrinkVertically()
+                    ) {
+                        Column(modifier = Modifier.fillMaxWidth()) {
+                            // Search bar
+                            OutlinedTextField(
+                                value = searchQuery,
+                                onValueChange = { vm.setSearchQuery(it) },
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .padding(horizontal = 16.dp, vertical = 4.dp),
+                                placeholder = { Text("Search artist, title…") },
+                                leadingIcon = {
+                                    Icon(Icons.Default.Search, contentDescription = null)
+                                },
+                                trailingIcon = {
+                                    if (searchQuery.isNotEmpty()) {
+                                        IconButton(onClick = { vm.setSearchQuery("") }) {
+                                            Icon(Icons.Default.Clear, contentDescription = "Clear")
+                                        }
+                                    }
+                                },
+                                singleLine = true,
+                                shape = MaterialTheme.shapes.medium
+                            )
+
+                            // Sort + artist filter toggle row
+                            Row(
+                                modifier = Modifier
+                                    .fillMaxWidth()
+                                    .padding(horizontal = 16.dp, vertical = 4.dp),
+                                horizontalArrangement = Arrangement.SpaceBetween,
+                                verticalAlignment = Alignment.CenterVertically
+                            ) {
+                                Box {
+                                    TextButton(onClick = { showSortMenu = true }) {
+                                        Text(
+                                            sortMode.label,
+                                            style = MaterialTheme.typography.labelMedium
+                                        )
+                                    }
+                                    DropdownMenu(
+                                        expanded = showSortMenu,
+                                        onDismissRequest = { showSortMenu = false }
+                                    ) {
+                                        SortMode.entries.forEach { mode ->
+                                            DropdownMenuItem(
+                                                text = {
+                                                    Text(
+                                                        mode.label,
+                                                        fontWeight = if (mode == sortMode)
+                                                            FontWeight.Bold else FontWeight.Normal
+                                                    )
+                                                },
+                                                onClick = {
+                                                    vm.setSortMode(mode)
+                                                    showSortMenu = false
+                                                }
+                                            )
+                                        }
+                                    }
+                                }
+
+                                TextButton(onClick = { showArtistFilter = !showArtistFilter }) {
+                                    Text(
+                                        if (hiddenArtists.isEmpty()) "Artists"
+                                        else "Artists (${hiddenArtists.size} hidden)",
+                                        style = MaterialTheme.typography.labelMedium
+                                    )
+                                }
+                            }
+
+                            // Artist filter chips (nested collapse)
+                            AnimatedVisibility(
+                                visible = showArtistFilter,
+                                enter = expandVertically(),
+                                exit = shrinkVertically()
+                            ) {
+                                Column(
+                                    modifier = Modifier
+                                        .fillMaxWidth()
+                                        .padding(horizontal = 16.dp)
+                                ) {
+                                    Row(
+                                        horizontalArrangement = Arrangement.spacedBy(8.dp)
+                                    ) {
+                                        TextButton(onClick = { vm.showAllArtists() }) {
+                                            Text("All", style = MaterialTheme.typography.labelSmall)
+                                        }
+                                        TextButton(onClick = { vm.hideAllArtists() }) {
+                                            Text("None", style = MaterialTheme.typography.labelSmall)
+                                        }
+                                    }
+                                    FlowRow(
+                                        horizontalArrangement = Arrangement.spacedBy(6.dp),
+                                        verticalArrangement = Arrangement.spacedBy(2.dp)
+                                    ) {
+                                        availableArtists.forEach { artist ->
+                                            FilterChip(
+                                                selected = artist !in hiddenArtists,
+                                                onClick = { vm.toggleArtist(artist) },
+                                                label = {
+                                                    Text(
+                                                        artist,
+                                                        style = MaterialTheme.typography.labelSmall
+                                                    )
+                                                }
+                                            )
+                                        }
+                                    }
+                                }
+                            }
+
+                            HorizontalDivider(modifier = Modifier.padding(top = 8.dp))
+                        }
+                    }
+
+                    // ── Results count ──────────────────────────────
+                    Text(
+                        text = "${recordings.size} recordings",
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        modifier = Modifier.padding(horizontal = 16.dp, vertical = 4.dp)
+                    )
+
+                    // ── Recording list ─────────────────────────────
+                    LazyColumn(
+                        contentPadding = PaddingValues(
+                            start = 12.dp,
+                            end = 12.dp,
+                            bottom = 80.dp
+                        ),
+                        verticalArrangement = Arrangement.spacedBy(6.dp)
+                    ) {
+                        items(
+                            items = recordings,
+                            key = { it.id }
+                        ) { recording ->
+                            RecordingItem(
+                                recording = recording,
+                                onPlayClick = { /* TODO: wire up player */ },
+                                onNotesClick = if (recording.hasMidi) {
+                                    { /* TODO: open falling notes */ }
+                                } else null
+                            )
+                        }
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/keylightpiano/pianotimeline/ui/RecordingListViewModel.kt

@@ -0,0 +1,189 @@
+package com.keylightpiano.pianotimeline.ui
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import com.keylightpiano.pianotimeline.data.MusicRepository
+import com.keylightpiano.pianotimeline.data.SyncManager
+import com.keylightpiano.pianotimeline.domain.Recording
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+
+/**
+ * Drives the main recording list screen.
+ *
+ * Architecture: three independent state streams (search query, sort mode, artist filters)
+ * are combined with the Room-backed recording list into one final filtered+sorted list.
+ * Compose observes the result and recomposes when anything changes.
+ */
+class RecordingListViewModel(app: Application) : AndroidViewModel(app) {
+
+    private val repo = MusicRepository(app)
+    private val syncManager = SyncManager(app)
+
+    // ── Sync state ─────────────────────────────────────────────────────
+
+    private val _syncState = MutableStateFlow<SyncState>(SyncState.Syncing)
+    val syncState: StateFlow<SyncState> = _syncState.asStateFlow()
+
+    // ── User-controlled filters ────────────────────────────────────────
+
+    private val _searchQuery = MutableStateFlow("")
+    val searchQuery: StateFlow<String> = _searchQuery.asStateFlow()
+
+    private val _sortMode = MutableStateFlow(SortMode.DATE_DESC)
+    val sortMode: StateFlow<SortMode> = _sortMode.asStateFlow()
+
+    /**
+     * Set of HIDDEN grouping-artist names. Empty = everything visible.
+     * We track hidden rather than visible so the default (empty set = show all)
+     * works without knowing the full artist list up front.
+     */
+    private val _hiddenArtists = MutableStateFlow<Set<String>>(emptySet())
+    val hiddenArtists: StateFlow<Set<String>> = _hiddenArtists.asStateFlow()
+
+    // ── Derived: all unique grouping artists, for the filter UI ────────
+
+    /** All recordings straight from Room (unfiltered). */
+    private val allRecordings = repo.observeRecordings()
+        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), emptyList())
+
+    /**
+     * Sorted list of unique grouping artists derived from the full recording list.
+     * Updates automatically if recordings change.
+     */
+    val availableArtists: StateFlow<List<String>> = allRecordings
+        .mapToState(viewModelScope) { recordings ->
+            recordings.map { it.groupingArtist }
+                .distinct()
+                .sorted()
+        }
+
+    // ── The final filtered + sorted list the UI renders ────────────────
+
+    val recordings: StateFlow<List<Recording>> = combine(
+        allRecordings,
+        _searchQuery,
+        _sortMode,
+        _hiddenArtists
+    ) { all, query, sort, hidden ->
+        all.filterByArtist(hidden)
+            .filterBySearch(query)
+            .sortedWith(sort.comparator())
+    }.stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), emptyList())
+
+    // ── Init: run sync on creation ─────────────────────────────────────
+
+    init {
+        viewModelScope.launch {
+            _syncState.value = SyncState.Syncing
+            val result = syncManager.sync()
+            _syncState.value = when (result) {
+                is SyncManager.SyncResult.UpToDate -> SyncState.Ready
+                is SyncManager.SyncResult.Updated -> SyncState.Ready
+                is SyncManager.SyncResult.Failed -> {
+                    // If we have cached data, still show it despite sync failure
+                    if (syncManager.hasCachedData()) SyncState.Ready
+                    else SyncState.Error(result.message)
+                }
+            }
+        }
+    }
+
+    // ── Public actions the UI calls ────────────────────────────────────
+
+    fun setSearchQuery(query: String) {
+        _searchQuery.value = query
+    }
+
+    fun setSortMode(mode: SortMode) {
+        _sortMode.value = mode
+    }
+
+    fun toggleArtist(groupingArtist: String) {
+        _hiddenArtists.value = _hiddenArtists.value.let { current ->
+            if (groupingArtist in current) current - groupingArtist
+            else current + groupingArtist
+        }
+    }
+
+    fun showAllArtists() {
+        _hiddenArtists.value = emptySet()
+    }
+
+    fun hideAllArtists() {
+        _hiddenArtists.value = availableArtists.value.toSet()
+    }
+
+    fun retry() {
+        _syncState.value = SyncState.Syncing
+        viewModelScope.launch {
+            val result = syncManager.sync()
+            _syncState.value = when (result) {
+                is SyncManager.SyncResult.UpToDate -> SyncState.Ready
+                is SyncManager.SyncResult.Updated -> SyncState.Ready
+                is SyncManager.SyncResult.Failed -> SyncState.Error(result.message)
+            }
+        }
+    }
+}
+
+// ── State types ────────────────────────────────────────────────────────
+
+sealed interface SyncState {
+    data object Syncing : SyncState
+    data object Ready : SyncState
+    data class Error(val message: String) : SyncState
+}
+
+// ── Private helpers ────────────────────────────────────────────────────
+
+/**
+ * Case-insensitive, token-based search.
+ * Splits the query into words; a recording matches if EVERY word appears
+ * somewhere in its artist, title, or extra-info. This gives a fuzzy feel
+ * ("chopin nocturne" matches "Chopin - Nocturne Op. 9...") without needing
+ * a real fuzzy library.
+ */
+private fun List<Recording>.filterBySearch(query: String): List<Recording> {
+    if (query.isBlank()) return this
+    val tokens = query.lowercase().split(" ").filter { it.isNotBlank() }
+    return filter { recording ->
+        val haystack = "${recording.artist} ${recording.title} ${recording.extraInfo}".lowercase()
+        tokens.all { token -> haystack.contains(token) }
+    }
+}
+
+private fun List<Recording>.filterByArtist(hidden: Set<String>): List<Recording> {
+    if (hidden.isEmpty()) return this
+    return filter { it.groupingArtist !in hidden }
+}
+
+private fun SortMode.comparator(): Comparator<Recording> = when (this) {
+    SortMode.DATE_DESC -> compareByDescending { it.date }
+    SortMode.DATE_ASC -> compareBy { it.date }
+    SortMode.ARTIST_AZ -> compareBy<Recording, String>(String.CASE_INSENSITIVE_ORDER) { it.artist }
+        .thenByDescending { it.date }
+    SortMode.ARTIST_ZA -> compareByDescending<Recording, String>(String.CASE_INSENSITIVE_ORDER) { it.artist }
+        .thenByDescending { it.date }
+    SortMode.TITLE_AZ -> compareBy<Recording, String>(String.CASE_INSENSITIVE_ORDER) { it.title }
+        .thenByDescending { it.date }
+    SortMode.DURATION_DESC -> compareByDescending { it.durationSeconds }
+    SortMode.DURATION_ASC -> compareBy { it.durationSeconds }
+}
+
+/**
+ * Helper to map a StateFlow through a transform into a new StateFlow.
+ * (Kotlin doesn't have this built-in; combine() only works with multiple flows.)
+ */
+private fun <T, R> StateFlow<T>.mapToState(
+    scope: kotlinx.coroutines.CoroutineScope,
+    transform: (T) -> R
+): StateFlow<R> = this.map { transform(it) }
+    .stateIn(scope, SharingStarted.WhileSubscribed(5000), transform(value))

app/src/main/java/com/keylightpiano/pianotimeline/ui/SortMode.kt

@@ -0,0 +1,15 @@
+package com.keylightpiano.pianotimeline.ui
+
+/**
+ * Available sort modes for the recording list.
+ * Each knows how to produce a Comparator for Recording.
+ */
+enum class SortMode(val label: String) {
+    DATE_DESC("Newest first"),
+    DATE_ASC("Oldest first"),
+    ARTIST_AZ("Artist A → Z"),
+    ARTIST_ZA("Artist Z → A"),
+    TITLE_AZ("Title A → Z"),
+    DURATION_DESC("Longest first"),
+    DURATION_ASC("Shortest first");
+}

gradle/libs.versions.toml

@@ -23,6 +23,7 @@ navigationCompose = "2.8.5"
 coil = "2.7.0"
 
 [libraries]
+androidx-compose-material-icons-core = { module = "androidx.compose.material:material-icons-core" }
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
 junit = { group = "junit", name = "junit", version.ref = "junit" }
 androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }