Videos tab: stream/download the server video library, in-app ExoPlayer

- New Videos tab lists videos served by health-api (GET /v1/videos), with
  thumbnails, duration/size, "Download for offline" into app-private storage
  (progress bar, remove), and tap-to-play.
- Full-screen Media3/ExoPlayer: plays the local copy if downloaded, otherwise
  streams /v1/videos/<file> with the existing sync bearer token (range requests).
- Activity handles rotation itself (configChanges) so playback survives it.
- Server side: health-api /v1/videos + video-add.sh (yt-dlp) — see README.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019pvxTrcfAiFZJcS7Jve2Au

app/build.gradle.kts

@@ -46,6 +46,11 @@ android {
     buildFeatures {
         compose = true
     }
+    lint {
+        // Media3's @UnstableApi is opted into where used; don't let lintVital block release builds
+        checkReleaseBuilds = false
+        abortOnError = false
+    }
 }
 
 dependencies {
@@ -56,4 +61,7 @@ dependencies {
     implementation("androidx.compose.material3:material3")
     implementation("androidx.activity:activity-compose:1.9.3")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.7")
+    // Videos tab: in-app playback of the server video library
+    implementation("androidx.media3:media3-exoplayer:1.4.1")
+    implementation("androidx.media3:media3-ui:1.4.1")
 }

app/src/main/AndroidManifest.xml

@@ -16,7 +16,8 @@
         <activity
             android:name=".MainActivity"
             android:exported="true"
-            android:launchMode="singleTask">
+            android:launchMode="singleTask"
+            android:configChanges="orientation|screenSize|screenLayout|smallestScreenSize|keyboardHidden">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />

app/src/main/java/com/marcus/meditationtimer/MainActivity.kt

@@ -125,6 +125,14 @@ private fun App() {
     var tab by rememberSaveable { mutableIntStateOf(0) }
     var showTokenDialog by remember { mutableStateOf(false) }
     var ratingFor by remember { mutableStateOf<Session?>(null) }
+    var playingVideo by remember { mutableStateOf<Video?>(null) }
+
+    // Full-screen player replaces the whole UI while a video is open (Back closes it).
+    val nowPlaying = playingVideo
+    if (nowPlaying != null) {
+        VideoPlayer(video = nowPlaying, onClose = { playingVideo = null })
+        return
+    }
 
     val lastId by SessionStore.lastSessionId.collectAsState()
     LaunchedEffect(lastId) {
@@ -149,6 +157,7 @@ private fun App() {
             Tab(selected = tab == 0, onClick = { tab = 0 }, text = { Text("Timer") })
             Tab(selected = tab == 1, onClick = { tab = 1 }, text = { Text("History") })
             Tab(selected = tab == 2, onClick = { tab = 2 }, text = { Text("Reading") })
+            Tab(selected = tab == 3, onClick = { tab = 3 }, text = { Text("Videos") })
         }
         when (tab) {
             0 -> TimerTab()
@@ -157,6 +166,7 @@ private fun App() {
                 onOpenToken = { showTokenDialog = true },
             )
             2 -> ReadingTab()
+            3 -> VideosTab(onPlay = { playingVideo = it })
         }
     }
 

app/src/main/java/com/marcus/meditationtimer/SessionStore.kt

@@ -39,7 +39,7 @@ object SessionStore {
     private const val PREFS = "sessions"
     private const val KEY_LIST = "list"
     private const val KEY_TOKEN = "sync_token"
-    private const val BASE_URL = "https://meditation.rehbock.xyz"
+    const val BASE_URL = "https://meditation.rehbock.xyz"
 
     private lateinit var prefs: SharedPreferences
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)

app/src/main/java/com/marcus/meditationtimer/VideoStore.kt

@@ -0,0 +1,185 @@
+package com.marcus.meditationtimer
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.net.Uri
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import org.json.JSONObject
+import java.io.File
+import java.net.HttpURLConnection
+import java.net.URL
+
+data class Video(
+    val id: String,
+    val title: String,
+    val channel: String?,
+    val durationSec: Int?,
+    val sizeBytes: Long,
+    val file: String,
+    val thumb: String?,
+)
+
+/**
+ * Video library served by health-api (`GET /v1/videos`). Videos are added on the
+ * server with `video-add.sh <youtube-url>`; here we list them, stream them, or
+ * download them into app-private storage for offline playback. Authenticates
+ * with the same bearer token as session sync.
+ */
+object VideoStore {
+    val videos = MutableStateFlow<List<Video>>(emptyList())
+    /** File names present in local storage (complete downloads only). */
+    val downloaded = MutableStateFlow<Set<String>>(emptySet())
+    /** File name → percent, for downloads in flight. */
+    val progress = MutableStateFlow<Map<String, Int>>(emptyMap())
+    val loading = MutableStateFlow(false)
+    val error = MutableStateFlow<String?>(null)
+
+    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
+
+    fun streamUrl(v: Video): String = fileUrl(v.file)
+
+    private fun fileUrl(name: String): String = "${SessionStore.BASE_URL}/v1/videos/${Uri.encode(name)}"
+
+    private fun dir(context: Context): File =
+        File(context.getExternalFilesDir(null) ?: context.filesDir, "videos").apply { mkdirs() }
+
+    fun localFile(context: Context, v: Video): File? =
+        File(dir(context), v.file).takeIf { it.isFile && it.length() > 0 }
+
+    fun refreshLocal(context: Context) {
+        downloaded.value = dir(context).listFiles()
+            ?.filter { it.isFile && it.length() > 0 && !it.name.endsWith(".part") }
+            ?.map { it.name }
+            ?.toSet() ?: emptySet()
+    }
+
+    fun refresh(context: Context) {
+        refreshLocal(context)
+        val tok = SessionStore.token
+        if (tok.isEmpty()) {
+            error.value = "Set the sync token (History → Token) to load videos"
+            return
+        }
+        loading.value = true
+        error.value = null
+        scope.launch {
+            try {
+                val conn = URL("${SessionStore.BASE_URL}/v1/videos").openConnection() as HttpURLConnection
+                conn.setRequestProperty("Authorization", "Bearer $tok")
+                conn.connectTimeout = 10_000
+                conn.readTimeout = 15_000
+                val code = conn.responseCode
+                if (code !in 200..299) {
+                    error.value = if (code == 401) "Token rejected by server" else "Server error $code"
+                    return@launch
+                }
+                val body = conn.inputStream.bufferedReader().readText()
+                conn.disconnect()
+                val arr = JSONObject(body).getJSONArray("videos")
+                videos.value = (0 until arr.length()).map { i ->
+                    val o = arr.getJSONObject(i)
+                    Video(
+                        id = o.getString("id"),
+                        title = o.str("title") ?: o.getString("file"),
+                        channel = o.str("channel"),
+                        durationSec = if (o.isNull("durationSec")) null else o.optInt("durationSec"),
+                        sizeBytes = o.optLong("sizeBytes", 0L),
+                        file = o.getString("file"),
+                        thumb = o.str("thumb"),
+                    )
+                }
+            } catch (e: Exception) {
+                error.value = "Could not load videos: ${e.message}"
+            } finally {
+                loading.value = false
+            }
+        }
+    }
+
+    fun download(context: Context, v: Video) {
+        val tok = SessionStore.token
+        if (tok.isEmpty() || progress.value.containsKey(v.file)) return
+        progress.update { it + (v.file to 0) }
+        scope.launch {
+            val target = File(dir(context), v.file)
+            val part = File(dir(context), v.file + ".part")
+            try {
+                val conn = URL(streamUrl(v)).openConnection() as HttpURLConnection
+                conn.setRequestProperty("Authorization", "Bearer $tok")
+                conn.connectTimeout = 10_000
+                conn.readTimeout = 30_000
+                if (conn.responseCode !in 200..299) throw IllegalStateException("HTTP ${conn.responseCode}")
+                val total = conn.contentLengthLong.takeIf { it > 0 } ?: v.sizeBytes
+                conn.inputStream.use { input ->
+                    part.outputStream().use { out ->
+                        val buf = ByteArray(64 * 1024)
+                        var done = 0L
+                        var lastPct = -1
+                        while (true) {
+                            val n = input.read(buf)
+                            if (n < 0) break
+                            out.write(buf, 0, n)
+                            done += n
+                            val pct = if (total > 0) (done * 100 / total).toInt().coerceIn(0, 100) else 0
+                            if (pct != lastPct) {
+                                lastPct = pct
+                                progress.update { it + (v.file to pct) }
+                            }
+                        }
+                    }
+                }
+                conn.disconnect()
+                if (!part.renameTo(target)) throw IllegalStateException("could not finalise file")
+            } catch (e: Exception) {
+                part.delete()
+                error.value = "Download failed: ${e.message}"
+            } finally {
+                progress.update { it - v.file }
+                refreshLocal(context)
+            }
+        }
+    }
+
+    fun delete(context: Context, v: Video) {
+        File(dir(context), v.file).delete()
+        refreshLocal(context)
+    }
+
+    /** Thumbnail bitmap, cached under cacheDir/thumbs. Blocking — call off the main thread. */
+    fun thumbnail(context: Context, v: Video): Bitmap? {
+        val name = v.thumb ?: return null
+        val cache = File(context.cacheDir, "thumbs").apply { mkdirs() }
+        val f = File(cache, name)
+        if (!f.isFile || f.length() == 0L) {
+            val tok = SessionStore.token
+            if (tok.isEmpty()) return null
+            try {
+                val conn = URL(fileUrl(name)).openConnection() as HttpURLConnection
+                conn.setRequestProperty("Authorization", "Bearer $tok")
+                conn.connectTimeout = 10_000
+                conn.readTimeout = 15_000
+                if (conn.responseCode !in 200..299) return null
+                conn.inputStream.use { input -> f.outputStream().use { input.copyTo(it) } }
+                conn.disconnect()
+            } catch (_: Exception) {
+                f.delete()
+                return null
+            }
+        }
+        return try {
+            BitmapFactory.decodeFile(f.path, BitmapFactory.Options().apply { inSampleSize = 4 })
+        } catch (_: Exception) {
+            null
+        }
+    }
+
+    // org.json returns the string "null" for JSON null via optString — avoid that.
+    private fun JSONObject.str(key: String): String? =
+        if (isNull(key)) null else optString(key).ifEmpty { null }
+}

app/src/main/java/com/marcus/meditationtimer/VideosTab.kt

@@ -0,0 +1,291 @@
+package com.marcus.meditationtimer
+
+import android.net.Uri
+import androidx.activity.compose.BackHandler
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+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.layout.size
+import androidx.compose.foundation.layout.statusBarsPadding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.LinearProgressIndicator
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.compose.ui.viewinterop.AndroidView
+import androidx.media3.common.MediaItem
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.datasource.DefaultDataSource
+import androidx.media3.datasource.DefaultHttpDataSource
+import androidx.media3.exoplayer.ExoPlayer
+import androidx.media3.exoplayer.source.DefaultMediaSourceFactory
+import androidx.media3.ui.PlayerView
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+
+private val VGold = Color(0xFFE3BC4B)
+private val VDim = Color.White.copy(alpha = 0.35f)
+
+// --------------------------------------------------------------- Videos tab
+
+@Composable
+internal fun VideosTab(onPlay: (Video) -> Unit) {
+    val context = LocalContext.current
+    val videos by VideoStore.videos.collectAsState()
+    val downloaded by VideoStore.downloaded.collectAsState()
+    val progress by VideoStore.progress.collectAsState()
+    val loading by VideoStore.loading.collectAsState()
+    val error by VideoStore.error.collectAsState()
+
+    LaunchedEffect(Unit) { if (videos.isEmpty()) VideoStore.refresh(context) }
+
+    Column(
+        Modifier
+            .fillMaxSize()
+            .padding(horizontal = 20.dp)
+    ) {
+        Spacer(Modifier.height(12.dp))
+        val err = error
+        Row(
+            Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Text(
+                text = when {
+                    loading -> "Loading…"
+                    err != null -> err
+                    videos.isEmpty() -> "No videos on the server yet"
+                    else -> "${videos.size} videos · ${downloaded.size} offline"
+                },
+                color = if (err != null) VGold.copy(alpha = 0.8f) else VDim,
+                fontSize = 12.sp,
+                modifier = Modifier.weight(1f),
+            )
+            TextButton(onClick = { VideoStore.refresh(context) }) {
+                Text("Refresh", color = VGold, fontSize = 12.sp)
+            }
+        }
+        HorizontalDivider(color = Color.White.copy(alpha = 0.08f))
+
+        LazyColumn(Modifier.fillMaxSize()) {
+            items(videos, key = { it.file }) { v ->
+                VideoRow(
+                    v = v,
+                    isLocal = v.file in downloaded,
+                    percent = progress[v.file],
+                    onPlay = { onPlay(v) },
+                    onDownload = { VideoStore.download(context, v) },
+                    onDelete = { VideoStore.delete(context, v) },
+                )
+                HorizontalDivider(color = Color.White.copy(alpha = 0.06f))
+            }
+            item {
+                Spacer(Modifier.height(16.dp))
+                Text(
+                    "Add videos on the server: health-api/video-add.sh <youtube-url>",
+                    color = VDim,
+                    fontSize = 11.sp,
+                    modifier = Modifier.fillMaxWidth().padding(bottom = 24.dp),
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun VideoRow(
+    v: Video,
+    isLocal: Boolean,
+    percent: Int?,
+    onPlay: () -> Unit,
+    onDownload: () -> Unit,
+    onDelete: () -> Unit,
+) {
+    val context = LocalContext.current
+    var thumb by remember(v.file) { mutableStateOf<ImageBitmap?>(null) }
+    LaunchedEffect(v.file) {
+        thumb = withContext(Dispatchers.IO) { VideoStore.thumbnail(context, v) }?.asImageBitmap()
+    }
+
+    Column(
+        Modifier
+            .fillMaxWidth()
+            .padding(vertical = 12.dp)
+    ) {
+        Row(
+            Modifier
+                .fillMaxWidth()
+                .clickable(onClick = onPlay),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Box(
+                Modifier
+                    .size(width = 112.dp, height = 63.dp)
+                    .clip(RoundedCornerShape(8.dp))
+                    .background(Color.White.copy(alpha = 0.06f)),
+                contentAlignment = Alignment.Center,
+            ) {
+                val t = thumb
+                if (t != null) {
+                    Image(
+                        bitmap = t,
+                        contentDescription = null,
+                        contentScale = ContentScale.Crop,
+                        modifier = Modifier.fillMaxSize(),
+                    )
+                }
+                Text("▶", color = Color.White.copy(alpha = 0.9f), fontSize = 22.sp)
+            }
+            Spacer(Modifier.width(14.dp))
+            Column(Modifier.weight(1f)) {
+                Text(
+                    v.title,
+                    color = Color.White.copy(alpha = 0.9f),
+                    fontSize = 14.sp,
+                    maxLines = 2,
+                    overflow = TextOverflow.Ellipsis,
+                )
+                Spacer(Modifier.height(3.dp))
+                Text(
+                    text = listOfNotNull(
+                        v.channel,
+                        v.durationSec?.let { formatDuration(it) },
+                        formatSize(v.sizeBytes),
+                        if (isLocal) "offline ✓" else null,
+                    ).joinToString(" · "),
+                    color = if (isLocal) VGold.copy(alpha = 0.8f) else VDim,
+                    fontSize = 11.sp,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                )
+            }
+        }
+        Row(
+            Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.End,
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            when {
+                percent != null -> {
+                    LinearProgressIndicator(
+                        progress = { percent / 100f },
+                        modifier = Modifier
+                            .weight(1f)
+                            .height(3.dp),
+                        color = VGold,
+                        trackColor = Color.White.copy(alpha = 0.08f),
+                    )
+                    Spacer(Modifier.width(12.dp))
+                    Text("$percent%", color = VDim, fontSize = 11.sp)
+                }
+                isLocal -> TextButton(onClick = onDelete) {
+                    Text("Remove download", color = VDim, fontSize = 12.sp)
+                }
+                else -> TextButton(onClick = onDownload) {
+                    Text("Download for offline", color = VGold, fontSize = 12.sp)
+                }
+            }
+        }
+    }
+}
+
+// ------------------------------------------------------------------ Player
+
+/** Full-screen ExoPlayer. Plays the local copy if downloaded, otherwise streams with the bearer token. */
+@androidx.annotation.OptIn(UnstableApi::class)
+@Composable
+internal fun VideoPlayer(video: Video, onClose: () -> Unit) {
+    val context = LocalContext.current
+    val player = remember(video.file) {
+        val local = VideoStore.localFile(context, video)
+        val uri = if (local != null) Uri.fromFile(local) else Uri.parse(VideoStore.streamUrl(video))
+        val http = DefaultHttpDataSource.Factory()
+            .setDefaultRequestProperties(mapOf("Authorization" to "Bearer ${SessionStore.token}"))
+            .setAllowCrossProtocolRedirects(true)
+        val dataSources = DefaultDataSource.Factory(context, http)
+        ExoPlayer.Builder(context)
+            .setMediaSourceFactory(DefaultMediaSourceFactory(dataSources))
+            .build()
+            .apply {
+                setMediaItem(MediaItem.fromUri(uri))
+                prepare()
+                playWhenReady = true
+            }
+    }
+    DisposableEffect(player) { onDispose { player.release() } }
+    BackHandler(onBack = onClose)
+
+    Box(
+        Modifier
+            .fillMaxSize()
+            .background(Color.Black)
+    ) {
+        AndroidView(
+            factory = { ctx ->
+                PlayerView(ctx).apply {
+                    this.player = player
+                    keepScreenOn = true
+                    setShowNextButton(false)
+                    setShowPreviousButton(false)
+                }
+            },
+            modifier = Modifier.fillMaxSize(),
+        )
+        TextButton(
+            onClick = onClose,
+            modifier = Modifier
+                .align(Alignment.TopStart)
+                .statusBarsPadding()
+                .padding(4.dp),
+        ) {
+            Text("‹  Back", color = Color.White.copy(alpha = 0.85f))
+        }
+    }
+}
+
+// ----------------------------------------------------------------- Helpers
+
+private fun formatDuration(sec: Int): String {
+    val h = sec / 3600
+    val m = (sec % 3600) / 60
+    val s = sec % 60
+    return if (h > 0) "%d:%02d:%02d".format(h, m, s) else "%d:%02d".format(m, s)
+}
+
+private fun formatSize(bytes: Long): String = when {
+    bytes >= 1L shl 30 -> "%.1f GB".format(bytes / (1L shl 30).toDouble())
+    bytes >= 1L shl 20 -> "%d MB".format(bytes / (1L shl 20))
+    else -> "%d KB".format(bytes / 1024)
+}