+image viewer, better dupes protection and background processing

composeApp/src/androidMain/AndroidManifest.xml

@@ -43,6 +43,15 @@
                 <data android:scheme="file" android:mimeType="*/*" android:pathPattern=".*\\.fb2\\.zip"/>
             </intent-filter>
         </activity>
+        <provider
+                android:name="androidx.core.content.FileProvider"
+                android:authorities="${applicationId}.imageviewer.fileprovider"
+                android:exported="false"
+                android:grantUriPermissions="true">
+            <meta-data
+                    android:name="android.support.FILE_PROVIDER_PATHS"
+                    android:resource="@xml/image_clipboard_paths"/>
+        </provider>
     </application>
 
 </manifest>

composeApp/src/androidMain/kotlin/net/sergeych/toread/BookPlatform.android.kt

@@ -1,5 +1,7 @@
 package net.sergeych.toread
 
+import android.content.ClipData
+import android.content.ClipboardManager
 import android.content.ContentResolver
 import android.content.ComponentCallbacks
 import android.content.Context
@@ -12,6 +14,7 @@ import android.provider.DocumentsContract
 import android.provider.OpenableColumns
 import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.asImageBitmap
+import androidx.core.content.FileProvider
 import net.sergeych.toread.fb2.Fb2Binary
 import net.sergeych.toread.storage.BookReadingStatus
 import net.sergeych.toread.storage.ContentAnchor
@@ -24,7 +27,12 @@ import java.io.File
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
+import java.util.concurrent.atomic.AtomicInteger
+import java.util.concurrent.atomic.AtomicReference
+import kotlinx.coroutines.async
+import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
 private lateinit var appContext: Context
@@ -54,6 +62,34 @@ actual fun decodeImageBytes(bytes: ByteArray): ImageBitmap? =
         BitmapFactory.decodeByteArray(bytes, 0, bytes.size)?.asImageBitmap()
     }.getOrNull()
 
+actual suspend fun copyImageToClipboard(bytes: ByteArray, mimeType: String, label: String): Boolean = withContext(Dispatchers.IO) {
+    runCatching {
+        val imageDir = File(appContext.cacheDir, "clipboard-images").also { it.mkdirs() }
+        val extension = when (mimeType.lowercase()) {
+            "image/png" -> "png"
+            "image/gif" -> "gif"
+            "image/webp" -> "webp"
+            else -> "jpg"
+        }
+        val imageFile = File(imageDir, "book-image.$extension")
+        imageFile.writeBytes(bytes)
+
+        val uri = FileProvider.getUriForFile(
+            appContext,
+            "${appContext.packageName}.imageviewer.fileprovider",
+            imageFile,
+        )
+        val clipboard = appContext.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+        val clip = ClipData.newUri(appContext.contentResolver, label, uri).apply {
+            description.extras = android.os.PersistableBundle().apply {
+                putString("mime_type", mimeType)
+            }
+        }
+        clipboard.setPrimaryClip(clip)
+        true
+    }.getOrDefault(false)
+}
+
 actual fun defaultLibraryScanPath(): String? =
     Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)?.absolutePath
         ?: appContext.getExternalFilesDir(null)?.absolutePath
@@ -105,26 +141,68 @@ actual suspend fun loadLibraryItemCover(fileId: String): LibraryCover? = withCon
 actual suspend fun scanLibrarySubtree(
     path: String,
     onProgress: (LibraryScanProgress) -> Unit,
-): LibraryScanReport = withContext(Dispatchers.IO) {
+): LibraryScanReport = coroutineScope {
+    withContext(Dispatchers.IO) {
         appendLibraryLog("scan requested path=$path")
+    }
+    val totalFiles = AtomicInteger(-1)
+    val latestProgress = AtomicReference<LibraryScanProgress?>(null)
+
+    fun emitProgress(progress: LibraryScanProgress) {
+        val enriched = totalFiles.get().takeIf { it >= 0 }?.let { progress.copy(totalFiles = it) } ?: progress
+        latestProgress.set(enriched)
+        onProgress(enriched)
+    }
+
+    val totalJob = async(Dispatchers.IO) {
+        runCatching {
             if (path.isContentUri()) {
-        scanLibraryContentTree(Uri.parse(path), onProgress)
+                countContentTree(Uri.parse(path))
+            } else {
+                LibraryScanner.countSupportedBookFiles(File(path))
+            }
+        }.getOrNull()
+    }
+    val totalPublisher = launch(Dispatchers.IO) {
+        val total = totalJob.await() ?: return@launch
+        totalFiles.set(total)
+        emitProgress(latestProgress.get()?.copy(totalFiles = total) ?: LibraryScanProgress(0, 0, 0, 0, totalFiles = total))
+    }
+
+    val report = withContext(Dispatchers.IO) {
+        if (path.isContentUri()) {
+            scanLibraryContentTree(Uri.parse(path), ::emitProgress)
         } else {
             if (path.requiresExternalFileAccess() && directoryChooser?.ensureExternalFileAccess() != true) {
                 error("All files access is required to scan $path.")
             }
             openLibraryDatabase().useLibrary { db ->
                 val summary = LibraryScanner(db, ::appendLibraryLog).scanSubtree(File(path)) {
-                onProgress(it.toLibraryScanProgress())
+                    emitProgress(it.toLibraryScanProgress())
                 }
                 LibraryScanReport(
                     scannedFiles = summary.scannedFiles,
                     importedFiles = summary.importedFiles,
                     skippedFiles = summary.skippedFiles,
                     failedFiles = summary.failedFiles,
+                    totalFiles = totalFiles.get().takeIf { it >= 0 },
                 )
             }
         }
+    }
+    totalPublisher.join()
+    report.copy(totalFiles = totalFiles.get().takeIf { it >= 0 } ?: report.totalFiles)
+}
+
+private fun countContentTree(rootUri: Uri): Int {
+    var count = 0
+    walkContentTree(
+        rootUri = rootUri,
+        onVisited = {},
+    ) {
+        count += 1
+    }
+    return count
 }
 
 actual suspend fun openLibraryBook(fileId: String): ByteArray? = withContext(Dispatchers.IO) {

composeApp/src/androidMain/res/xml/image_clipboard_paths.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <cache-path name="clipboard_images" path="clipboard-images/"/>
+</paths>

composeApp/src/commonMain/kotlin/net/sergeych/toread/App.kt

@@ -4,6 +4,7 @@ import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
@@ -19,6 +20,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 
@@ -92,25 +94,64 @@ private fun AppToast(message: String?, modifier: Modifier = Modifier) {
 @Composable
 private fun BookReaderApp(onThemeToggle: () -> Unit) {
     var state by remember { mutableStateOf<AppState>(AppState.LoadingLibrary) }
+    var activeScan by remember { mutableStateOf<LibraryScanProgress?>(null) }
+    var scanJob by remember { mutableStateOf<Job?>(null) }
+    var imageViewer by remember { mutableStateOf<ViewedBookImage?>(null) }
+    val scope = rememberCoroutineScope()
 
     LaunchedEffect(Unit) {
         state = loadStartupState()
     }
 
+    fun startScan(path: String) {
+        if (scanJob?.isActive == true) return
+        activeScan = LibraryScanProgress(0, 0, 0, 0)
+        scanJob = scope.launch {
+            val report = runCatching {
+                scanLibrarySubtree(path) { progress ->
+                    scope.launch {
+                        if (scanJob?.isActive == true) activeScan = progress
+                    }
+                }
+            }
+            val message = report.fold(
+                onSuccess = {
+                    "Scanned ${it.scannedFiles}, imported ${it.importedFiles}, skipped ${it.skippedFiles}, failed ${it.failedFiles}."
+                },
+                onFailure = { it.message ?: "Scan failed." },
+            )
+            scanJob = null
+            activeScan = null
+            state = when (val current = state) {
+                is AppState.Library, is AppState.Scan, AppState.LoadingLibrary -> loadLibraryState(message, path)
+                is AppState.Reader -> current.copy(message = message)
+                is AppState.BookInfo -> current.copy(message = message)
+                is AppState.Error -> current
+            }
+        }
+    }
+
     when (val current = state) {
         AppState.LoadingLibrary -> LoadingScreen("Opening library")
         is AppState.Library -> LibraryScreen(
             state = current,
+            activeScan = activeScan,
             onStateChange = { state = it },
             onNavigateToScan = { state = AppState.Scan(current.items, current.scanPath, current.message) },
         )
         is AppState.Scan -> ScanScreen(
             state = current,
+            activeScan = activeScan,
             onStateChange = { state = it },
+            onStartScan = { path ->
+                startScan(path)
+                state = AppState.Library(current.items, path, "Scanning...")
+            },
         )
         is AppState.Reader -> BookView(
             fileId = current.fileId,
             book = current.book,
+            onImageOpen = { imageViewer = it },
             onThemeToggle = onThemeToggle,
             onBookInfo = {
                 state = AppState.BookInfo(
@@ -128,6 +169,7 @@ private fun BookReaderApp(onThemeToggle: () -> Unit) {
         is AppState.BookInfo -> BookInfoScreen(
             fileId = current.fileId,
             book = current.book,
+            onImageOpen = { imageViewer = it },
             onBack = {
                 state = AppState.Reader(
                     fileId = current.fileId,
@@ -140,4 +182,18 @@ private fun BookReaderApp(onThemeToggle: () -> Unit) {
         )
         is AppState.Error -> ErrorScreen(current.message, onBack = { state = AppState.LoadingLibrary })
     }
+
+    imageViewer?.let { image ->
+        ImageViewer(
+            image = image,
+            onBack = { imageViewer = null },
+        )
+    }
 }
+
+internal data class ViewedBookImage(
+    val bitmap: ImageBitmap,
+    val bytes: ByteArray,
+    val mimeType: String,
+    val title: String,
+)

composeApp/src/commonMain/kotlin/net/sergeych/toread/BookInfoScreen.kt

@@ -39,6 +39,7 @@ import net.sergeych.toread.fb2.Fb2Book
 internal fun BookInfoScreen(
     fileId: String,
     book: Fb2Book,
+    onImageOpen: (ViewedBookImage) -> Unit,
     onBack: () -> Unit,
 ) {
     val stats = remember(book) { BookStats.from(book) }
@@ -73,7 +74,7 @@ internal fun BookInfoScreen(
         ) {
             item {
                 InfoSection("Title Info") {
-                    CoverAndTitle(book)
+                    CoverAndTitle(book, onImageOpen = onImageOpen)
                     DetailLine("Title", book.title)
                     DetailLine("Authors", book.authors.joinToString { it.displayName }.ifBlank { "Unknown author" })
                     DetailLine("Language", book.language?.uppercase() ?: "Not specified")

composeApp/src/commonMain/kotlin/net/sergeych/toread/ImageViewer.kt

@@ -0,0 +1,190 @@
+package net.sergeych.toread
+
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.gestures.detectDragGestures
+import androidx.compose.foundation.gestures.rememberTransformableState
+import androidx.compose.foundation.gestures.transformable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.WindowInsets
+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.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.ContentCopy
+import androidx.compose.material.icons.filled.ZoomIn
+import androidx.compose.material.icons.filled.ZoomOut
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarDuration
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.graphicsLayer
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.input.key.Key
+import androidx.compose.ui.input.key.KeyEventType
+import androidx.compose.ui.input.key.isCtrlPressed
+import androidx.compose.ui.input.key.isMetaPressed
+import androidx.compose.ui.input.key.key
+import androidx.compose.ui.input.key.onPreviewKeyEvent
+import androidx.compose.ui.input.key.type
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.input.pointer.positionChange
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.unit.dp
+import androidx.compose.foundation.focusable
+import kotlinx.coroutines.launch
+
+private const val MinImageScale = 1f
+private const val MaxImageScale = 8f
+
+@Composable
+internal fun ImageViewer(
+    image: ViewedBookImage,
+    onBack: () -> Unit,
+) {
+    var scale by remember(image) { mutableStateOf(MinImageScale) }
+    var offset by remember(image) { mutableStateOf(Offset.Zero) }
+    val focusRequester = remember { FocusRequester() }
+    val snackbarHostState = remember { SnackbarHostState() }
+    val scope = rememberCoroutineScope()
+
+    fun setScale(next: Float) {
+        scale = next.coerceIn(MinImageScale, MaxImageScale)
+        if (scale == MinImageScale) offset = Offset.Zero
+    }
+
+    fun panBy(delta: Offset) {
+        if (scale > MinImageScale) {
+            offset += delta
+        } else {
+            offset = Offset.Zero
+        }
+    }
+
+    val transformState = rememberTransformableState { zoomChange, panChange, _ ->
+        setScale(scale * zoomChange)
+        panBy(panChange)
+    }
+
+    fun copyImage() {
+        scope.launch {
+            val message = if (copyImageToClipboard(image.bytes, image.mimeType, image.title)) {
+                "Image copied"
+            } else {
+                "Copy failed"
+            }
+            snackbarHostState.showSnackbar(message, duration = SnackbarDuration.Short)
+        }
+    }
+
+    LaunchedEffect(image) {
+        focusRequester.requestFocus()
+    }
+
+    Scaffold(
+        contentWindowInsets = WindowInsets(0, 0, 0, 0),
+        snackbarHost = { SnackbarHost(snackbarHostState) },
+        topBar = {
+            Surface(color = MaterialTheme.colorScheme.surface) {
+                Row(
+                    modifier = Modifier.fillMaxWidth().height(48.dp),
+                    verticalAlignment = Alignment.CenterVertically,
+                ) {
+                    IconButton(onClick = onBack) {
+                        Icon(Icons.AutoMirrored.Filled.ArrowBack, contentDescription = "Back")
+                    }
+                    Text(
+                        image.title,
+                        style = MaterialTheme.typography.titleSmall,
+                        maxLines = 1,
+                        modifier = Modifier.weight(1f),
+                    )
+                    IconButton(onClick = { setScale(scale * 1.25f) }) {
+                        Icon(Icons.Filled.ZoomIn, contentDescription = "Zoom in")
+                    }
+                    IconButton(onClick = { setScale(scale / 1.25f) }, enabled = scale > MinImageScale) {
+                        Icon(Icons.Filled.ZoomOut, contentDescription = "Zoom out")
+                    }
+                    IconButton(
+                        onClick = ::copyImage,
+                    ) {
+                        Icon(Icons.Filled.ContentCopy, contentDescription = "Copy image")
+                    }
+                }
+            }
+        },
+    ) { padding ->
+        Box(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(padding)
+                .background(Color.Black)
+                .focusRequester(focusRequester)
+                .onPreviewKeyEvent { event ->
+                    if (event.type != KeyEventType.KeyDown) return@onPreviewKeyEvent false
+                    when {
+                        event.key == Key.Escape -> {
+                            onBack()
+                            true
+                        }
+                        event.key == Key.Plus || event.key == Key.Equals -> {
+                            setScale(scale * 1.25f)
+                            true
+                        }
+                        event.key == Key.Minus -> {
+                            setScale(scale / 1.25f)
+                            true
+                        }
+                        event.key == Key.C && (event.isCtrlPressed || event.isMetaPressed) -> {
+                            copyImage()
+                            true
+                        }
+                        else -> false
+                    }
+                }
+                .focusable()
+                .transformable(transformState)
+                .pointerInput(image, scale) {
+                    detectDragGestures { change, dragAmount ->
+                        if (change.positionChange() != Offset.Zero) change.consume()
+                        panBy(dragAmount)
+                    }
+                },
+            contentAlignment = Alignment.Center,
+        ) {
+            Image(
+                bitmap = image.bitmap,
+                contentDescription = image.title,
+                modifier = Modifier
+                    .fillMaxSize()
+                    .graphicsLayer {
+                        scaleX = scale
+                        scaleY = scale
+                        translationX = offset.x
+                        translationY = offset.y
+                    },
+                contentScale = ContentScale.Fit,
+            )
+        }
+    }
+}

composeApp/src/commonMain/kotlin/net/sergeych/toread/LibraryPlatform.kt

@@ -31,6 +31,7 @@ data class LibraryScanReport(
     val importedFiles: Int,
     val skippedFiles: Int,
     val failedFiles: Int,
+    val totalFiles: Int? = null,
 )
 
 data class LibraryScanProgress(
@@ -39,6 +40,7 @@ data class LibraryScanProgress(
     val skippedFiles: Int,
     val failedFiles: Int,
     val currentFile: String? = null,
+    val totalFiles: Int? = null,
 )
 
 data class PlatformOpenBookRequest(

composeApp/src/commonMain/kotlin/net/sergeych/toread/LibraryScreen.kt

@@ -54,12 +54,14 @@ import androidx.compose.ui.unit.dp
 import net.sergeych.toread.fb2.Fb2Format
 import net.sergeych.toread.storage.BookReadingStatus
 import kotlin.math.roundToInt
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 
 @Composable
 @OptIn(ExperimentalMaterial3Api::class)
 internal fun LibraryScreen(
     state: AppState.Library,
+    activeScan: LibraryScanProgress?,
     onStateChange: (AppState) -> Unit,
     onNavigateToScan: () -> Unit,
 ) {
@@ -70,6 +72,7 @@ internal fun LibraryScreen(
     var nextOffset by remember(state.items) { mutableStateOf(state.items.size) }
     var loadingPage by remember(state.items) { mutableStateOf(false) }
     var endReached by remember(state.items) { mutableStateOf(false) }
+    var wasScanning by remember { mutableStateOf(false) }
     val coverCache = remember { mutableStateMapOf<String, LibraryCover?>() }
 
     suspend fun loadPage(reset: Boolean = false) {
@@ -104,6 +107,19 @@ internal fun LibraryScreen(
         if (items.isEmpty() && !endReached) loadPage(reset = true)
     }
 
+    LaunchedEffect(activeScan != null) {
+        if (activeScan != null) {
+            wasScanning = true
+            while (true) {
+                delay(5_000)
+                loadPage(reset = true)
+            }
+        } else if (wasScanning) {
+            wasScanning = false
+            loadPage(reset = true)
+        }
+    }
+
     Scaffold(
         topBar = {
             CenterAlignedTopAppBar(
@@ -140,7 +156,7 @@ internal fun LibraryScreen(
             } else {
                 LazyColumn(
                     modifier = Modifier.fillMaxSize(),
-                    contentPadding = PaddingValues(0.dp),
+                    contentPadding = PaddingValues(bottom = if (activeScan != null) 88.dp else 0.dp),
                     verticalArrangement = Arrangement.spacedBy(4.dp),
                 ) {
                     val hasReadingNow = items.firstOrNull()?.readingStatus == BookReadingStatus.READING
@@ -264,6 +280,14 @@ internal fun LibraryScreen(
                     }
                 }
             }
+            activeScan?.let { progress ->
+                LibraryScanStatusPanel(
+                    progress = progress,
+                    modifier = Modifier
+                        .align(Alignment.BottomCenter)
+                        .padding(horizontal = if (wide) 24.dp else 14.dp, vertical = 14.dp),
+                )
+            }
         }
     }
 }
@@ -291,6 +315,36 @@ private fun LibrarySectionHeader(text: String) {
     )
 }
 
+@Composable
+private fun LibraryScanStatusPanel(progress: LibraryScanProgress, modifier: Modifier = Modifier) {
+    Card(
+        shape = RoundedCornerShape(8.dp),
+        colors = quietCardColors(),
+        modifier = modifier.fillMaxWidth(),
+    ) {
+        Row(
+            modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 12.dp),
+            horizontalArrangement = Arrangement.spacedBy(12.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            CircularProgressIndicator(modifier = Modifier.width(22.dp).height(22.dp), strokeWidth = 2.dp)
+            Column(verticalArrangement = Arrangement.spacedBy(2.dp)) {
+                Text(
+                    progress.toCatalogScanMessage(),
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.primary,
+                    fontWeight = FontWeight.SemiBold,
+                )
+                Text(
+                    "Imported ${progress.importedFiles}, skipped ${progress.skippedFiles}, failed ${progress.failedFiles}",
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.outline,
+                )
+            }
+        }
+    }
+}
+
 @Composable
 private fun LibraryRow(
     item: LibraryItem,
@@ -454,4 +508,14 @@ private fun Long.formatBytes(): String =
         else -> "$this B"
     }
 
+private fun LibraryScanProgress.toCatalogScanMessage(): String {
+    val total = totalFiles ?: return "Scanned $scannedFiles books"
+    val percent = if (total <= 0) {
+        100
+    } else {
+        ((scannedFiles.toDouble() / total.toDouble()) * 100.0).roundToInt().coerceIn(0, 100)
+    }
+    return "Scanned $scannedFiles of $total, $percent% done"
+}
+
 private const val LibraryPageSize: Int = 50

composeApp/src/commonMain/kotlin/net/sergeych/toread/PlatformImages.kt

@@ -15,3 +15,5 @@ expect fun loadDefaultBookBytes(): ByteArray?
 expect fun decodeBookImage(binary: Fb2Binary): ImageBitmap?
 
 expect fun decodeImageBytes(bytes: ByteArray): ImageBitmap?
+
+expect suspend fun copyImageToClipboard(bytes: ByteArray, mimeType: String, label: String): Boolean

composeApp/src/commonMain/kotlin/net/sergeych/toread/ReaderContent.kt

@@ -2,6 +2,7 @@ package net.sergeych.toread
 
 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
@@ -75,6 +76,7 @@ internal fun ContinuousBookReader(
     stats: BookStats,
     listState: LazyListState,
     modifier: Modifier = Modifier,
+    onImageOpen: (ViewedBookImage) -> Unit = {},
 ) {
     val hyphenation = remember { HyphenationRegistry() }
     val contentPadding = if (isAndroidPlatform()) {
@@ -92,7 +94,7 @@ internal fun ContinuousBookReader(
     ) {
         item {
             Column(verticalArrangement = Arrangement.spacedBy(14.dp)) {
-                CoverAndTitle(book)
+                CoverAndTitle(book, onImageOpen = onImageOpen)
                 MetadataCard(book)
                 StatsCard(stats)
             }
@@ -107,6 +109,7 @@ internal fun ContinuousBookReader(
                 depth = 0,
                 keyPrefix = "section-$index",
                 hyphenation = hyphenation,
+                onImageOpen = onImageOpen,
             )
         }
         item { Spacer(Modifier.height(22.dp)) }
@@ -119,6 +122,7 @@ private fun LazyListScope.sectionItems(
     depth: Int,
     keyPrefix: String,
     hyphenation: HyphenationRegistry,
+    onImageOpen: (ViewedBookImage) -> Unit,
 ) {
     if( section.title.isNullOrBlank() ) {
         item {
@@ -153,6 +157,7 @@ private fun LazyListScope.sectionItems(
                 image = block.image,
                 modifier = Modifier.fillMaxWidth().padding(vertical = 10.dp),
                 contentScale = ContentScale.Fit,
+                onOpen = onImageOpen,
             )
             is Fb2Block.Paragraph -> ReaderText(
                 text = block.content,
@@ -181,6 +186,7 @@ private fun LazyListScope.sectionItems(
             depth = depth + 1,
             keyPrefix = "$keyPrefix-$index",
             hyphenation = hyphenation,
+            onImageOpen = onImageOpen,
         )
     }
 }
@@ -232,7 +238,7 @@ private fun DetailsPane(
 }
 
 @Composable
-internal fun CoverAndTitle(book: Fb2Book) {
+internal fun CoverAndTitle(book: Fb2Book, onImageOpen: (ViewedBookImage) -> Unit = {}) {
     Row(
         horizontalArrangement = Arrangement.spacedBy(16.dp),
         verticalAlignment = Alignment.CenterVertically,
@@ -243,6 +249,7 @@ internal fun CoverAndTitle(book: Fb2Book) {
             image = book.coverImages.firstOrNull() ?: book.bodyImages.firstOrNull(),
             modifier = Modifier.width(112.dp).aspectRatio(0.68f),
             contentScale = ContentScale.Crop,
+            onOpen = onImageOpen,
         )
         Column(verticalArrangement = Arrangement.spacedBy(6.dp), modifier = Modifier.weight(1f)) {
             Text(book.title, style = MaterialTheme.typography.headlineSmall, fontWeight = FontWeight.Bold)
@@ -428,20 +435,41 @@ private fun BookImage(
     image: Fb2ImageRef?,
     modifier: Modifier = Modifier,
     contentScale: ContentScale = ContentScale.Fit,
+    onOpen: (ViewedBookImage) -> Unit = {},
 ) {
-    val bitmap = remember(book, image) {
+    val binary = remember(book, image) {
-        image?.let(book::binaryFor)?.let { decodeBookImage(it) }
+        image?.let(book::binaryFor)
     }
+    val bitmap = remember(binary) {
+        binary?.let { decodeBookImage(it) }
+    }
+    val imageTitle = image?.alt?.ifBlank { null } ?: book.title
     Box(
         modifier = modifier
             .clip(RoundedCornerShape(8.dp))
-            .background(MaterialTheme.colorScheme.surfaceVariant),
+            .background(MaterialTheme.colorScheme.surfaceVariant)
+            .then(
+                if (bitmap != null && binary != null) {
+                    Modifier.clickable {
+                        onOpen(
+                            ViewedBookImage(
+                                bitmap = bitmap,
+                                bytes = binary.imageBytes(),
+                                mimeType = binary.contentType,
+                                title = imageTitle,
+                            ),
+                        )
+                    }
+                } else {
+                    Modifier
+                },
+            ),
         contentAlignment = Alignment.Center,
     ) {
         if (bitmap != null) {
             Image(
                 bitmap = bitmap,
-                contentDescription = image?.alt ?: book.title,
+                contentDescription = imageTitle,
                 modifier = Modifier.fillMaxWidth(),
                 contentScale = contentScale,
             )

composeApp/src/commonMain/kotlin/net/sergeych/toread/ReaderScreen.kt

@@ -45,6 +45,7 @@ import kotlinx.coroutines.launch
 internal fun BookView(
     fileId: String,
     book: Fb2Book,
+    onImageOpen: (ViewedBookImage) -> Unit,
     onThemeToggle: () -> Unit,
     onBookInfo: () -> Unit,
     onBack: () -> Unit,
@@ -128,6 +129,7 @@ internal fun BookView(
                 stats = stats,
                 modifier = Modifier.fillMaxSize(),
                 listState = listState,
+                onImageOpen = onImageOpen,
             )
         }
     }

composeApp/src/commonMain/kotlin/net/sergeych/toread/ScanScreen.kt

@@ -44,13 +44,14 @@ import kotlinx.coroutines.launch
 @OptIn(ExperimentalMaterial3Api::class)
 internal fun ScanScreen(
     state: AppState.Scan,
+    activeScan: LibraryScanProgress?,
     onStateChange: (AppState) -> Unit,
+    onStartScan: (String) -> Unit,
 ) {
     val scope = rememberCoroutineScope()
     var scanPath by remember(state.scanPath) { mutableStateOf(state.scanPath) }
-    var busy by remember { mutableStateOf(false) }
     var message by remember(state.message) { mutableStateOf(state.message) }
-    var scanProgress by remember { mutableStateOf<LibraryScanProgress?>(null) }
+    val busy = activeScan != null
 
     Scaffold(
         topBar = {
@@ -92,28 +93,8 @@ internal fun ScanScreen(
                         Row(horizontalArrangement = Arrangement.spacedBy(10.dp), verticalAlignment = Alignment.CenterVertically) {
                             Button(
                                 onClick = {
-                                    scope.launch {
-                                        busy = true
-                                        scanProgress = null
-                                        try {
                                     message = "Scanning..."
-                                            val report = runCatching {
+                                    onStartScan(scanPath)
-                                                scanLibrarySubtree(scanPath) { progress ->
-                                                    scope.launch { scanProgress = progress }
-                                                }
-                                            }
-                                            val nextMessage = report.fold(
-                                                onSuccess = {
-                                                    "Scanned ${it.scannedFiles}, imported ${it.importedFiles}, skipped ${it.skippedFiles}, failed ${it.failedFiles}."
-                                                },
-                                                onFailure = { it.message ?: "Scan failed." },
-                                            )
-                                            onStateChange(loadLibraryState(nextMessage, scanPath))
-                                        } finally {
-                                            busy = false
-                                            scanProgress = null
-                                        }
-                                    }
                                 },
                                 enabled = !busy && scanPath.isNotBlank(),
                             ) {
@@ -137,15 +118,13 @@ internal fun ScanScreen(
                                 CircularProgressIndicator(modifier = Modifier.width(24.dp).height(24.dp), strokeWidth = 2.dp)
                             }
                         }
-                        if (busy) {
+                        if (activeScan != null) {
-                            scanProgress?.let { progress ->
                             Text(
-                                    progress.toScanMessage(),
+                                activeScan.toScanMessage(),
                                 style = MaterialTheme.typography.bodyMedium,
                                 color = MaterialTheme.colorScheme.primary,
                             )
                         }
-                        }
                         message?.let {
                             Text(it, style = MaterialTheme.typography.bodyMedium, color = MaterialTheme.colorScheme.secondary)
                         }

composeApp/src/jvmMain/kotlin/net/sergeych/toread/BookPlatform.jvm.kt

@@ -10,15 +10,26 @@ import net.sergeych.toread.storage.ReadingStateRecord
 import net.sergeych.toread.storage.jdbc.H2LibraryDatabase
 import net.sergeych.toread.storage.jdbc.LibraryScanner
 import org.jetbrains.skia.Image
+import java.awt.Toolkit
+import java.awt.datatransfer.DataFlavor
+import java.awt.datatransfer.Transferable
+import java.awt.datatransfer.UnsupportedFlavorException
 import java.io.File
+import java.io.ByteArrayInputStream
+import javax.imageio.ImageIO
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
+import java.util.concurrent.atomic.AtomicInteger
+import java.util.concurrent.atomic.AtomicReference
 import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.TimeUnit
 import javax.swing.JFileChooser
 import kotlin.concurrent.thread
+import kotlinx.coroutines.async
+import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 
 actual fun loadDefaultBookBytes(): ByteArray? {
@@ -37,6 +48,22 @@ actual fun decodeBookImage(binary: Fb2Binary): ImageBitmap? =
 actual fun decodeImageBytes(bytes: ByteArray): ImageBitmap? =
     runCatching { Image.makeFromEncoded(bytes).toComposeImageBitmap() }.getOrNull()
 
+actual suspend fun copyImageToClipboard(bytes: ByteArray, mimeType: String, label: String): Boolean = withContext(Dispatchers.IO) {
+    runCatching {
+        val image = ImageIO.read(ByteArrayInputStream(bytes)) ?: return@withContext false
+        val transferable = object : Transferable {
+            override fun getTransferDataFlavors(): Array<DataFlavor> = arrayOf(DataFlavor.imageFlavor)
+            override fun isDataFlavorSupported(flavor: DataFlavor): Boolean = flavor == DataFlavor.imageFlavor
+            override fun getTransferData(flavor: DataFlavor): Any {
+                if (!isDataFlavorSupported(flavor)) throw UnsupportedFlavorException(flavor)
+                return image
+            }
+        }
+        Toolkit.getDefaultToolkit().systemClipboard.setContents(transferable, null)
+        true
+    }.getOrDefault(false)
+}
+
 actual fun defaultLibraryScanPath(): String? = findProjectRoot()?.let { File(it, "test_books").absolutePath }
 
 actual suspend fun loadPlatformOpenBookRequest(): PlatformOpenBookRequest? = null
@@ -79,11 +106,33 @@ actual suspend fun loadLibraryItemCover(fileId: String): LibraryCover? = withCon
 actual suspend fun scanLibrarySubtree(
     path: String,
     onProgress: (LibraryScanProgress) -> Unit,
-): LibraryScanReport = withContext(Dispatchers.IO) {
+): LibraryScanReport = coroutineScope {
+    withContext(Dispatchers.IO) {
         appendLibraryLog("scan requested path=$path")
+    }
+    val root = File(path)
+    val totalFiles = AtomicInteger(-1)
+    val latestProgress = AtomicReference<LibraryScanProgress?>(null)
+
+    fun emitProgress(progress: LibraryScanProgress) {
+        val enriched = totalFiles.get().takeIf { it >= 0 }?.let { progress.copy(totalFiles = it) } ?: progress
+        latestProgress.set(enriched)
+        onProgress(enriched)
+    }
+
+    val totalJob = async(Dispatchers.IO) {
+        runCatching { LibraryScanner.countSupportedBookFiles(root) }.getOrNull()
+    }
+    val totalPublisher = launch(Dispatchers.IO) {
+        val total = totalJob.await() ?: return@launch
+        totalFiles.set(total)
+        emitProgress(latestProgress.get()?.copy(totalFiles = total) ?: LibraryScanProgress(0, 0, 0, 0, totalFiles = total))
+    }
+
+    val report = withContext(Dispatchers.IO) {
         openLibraryDatabase().useLibrary { db ->
-        val summary = LibraryScanner(db, ::appendLibraryLog).scanSubtree(File(path)) {
+            val summary = LibraryScanner(db, ::appendLibraryLog).scanSubtree(root) {
-            onProgress(
+                emitProgress(
                     LibraryScanProgress(
                         scannedFiles = it.scannedFiles,
                         importedFiles = it.importedFiles,
@@ -98,8 +147,12 @@ actual suspend fun scanLibrarySubtree(
                 importedFiles = summary.importedFiles,
                 skippedFiles = summary.skippedFiles,
                 failedFiles = summary.failedFiles,
+                totalFiles = totalFiles.get().takeIf { it >= 0 },
             )
         }
+    }
+    totalPublisher.join()
+    report.copy(totalFiles = totalFiles.get().takeIf { it >= 0 } ?: report.totalFiles)
 }
 
 actual suspend fun openLibraryBook(fileId: String): ByteArray? = withContext(Dispatchers.IO) {

composeApp/src/webMain/kotlin/net/sergeych/toread/BookPlatform.web.kt

@@ -12,6 +12,8 @@ actual fun decodeBookImage(binary: Fb2Binary): ImageBitmap? = null
 
 actual fun decodeImageBytes(bytes: ByteArray): ImageBitmap? = null
 
+actual suspend fun copyImageToClipboard(bytes: ByteArray, mimeType: String, label: String): Boolean = false
+
 actual fun defaultLibraryScanPath(): String? = null
 
 actual suspend fun loadPlatformOpenBookRequest(): PlatformOpenBookRequest? = null

shared/src/commonMain/kotlin/net/sergeych/toread/storage/LibraryStorage.kt

@@ -94,6 +94,7 @@ data class BookFileRecord(
     val bookId: String? = null,
     val bodyId: String? = null,
     val bodyClusterId: String? = null,
+    val duplicateOfFileId: String? = null,
     val rawSha256: String,
     val format: String? = null,
     val mimeType: String? = null,
@@ -194,6 +195,10 @@ interface BookFileRepository {
     fun get(id: String): BookFileRecord?
     fun getLibraryFile(id: String): LibraryFileRecord?
     fun findByRawSha256(rawSha256: String): List<BookFileRecord>
+    fun findByOriginalFilenameSizeAndModified(originalFilename: String, sizeBytes: Long, lastModifiedMillis: Long): List<BookFileRecord>
+    fun findByOriginalFilenameSizeAndRawSha256(originalFilename: String, sizeBytes: Long, rawSha256: String): List<BookFileRecord>
+    fun findPrimaryDuplicateTarget(bodyClusterId: String?, bodyId: String?, rawSha256: String): BookFileRecord?
+    fun markDuplicateFiles(): Int
     fun listLibraryFiles(limit: Int = 100, offset: Int = 0): List<LibraryFileRecord>
     fun list(limit: Int = 500, offset: Int = 0): List<BookFileRecord>
     fun listForBook(bookId: String): List<BookFileRecord>

shared/src/jdbcMain/kotlin/net/sergeych/toread/storage/jdbc/H2LibraryDatabase.kt

@@ -199,6 +199,7 @@ private fun migrate(connection: Connection) {
                 book_id VARCHAR,
                 body_id VARCHAR,
                 body_cluster_id VARCHAR,
+                duplicate_of_file_id VARCHAR,
                 raw_sha256 VARCHAR NOT NULL,
                 format VARCHAR,
                 mime_type VARCHAR,
@@ -219,10 +220,14 @@ private fun migrate(connection: Connection) {
             )
             """.trimIndent()
         )
+        statement.execute("ALTER TABLE book_files ADD COLUMN IF NOT EXISTS duplicate_of_file_id VARCHAR")
         statement.execute("ALTER TABLE book_files ADD COLUMN IF NOT EXISTS reading_status VARCHAR NOT NULL DEFAULT 'NEW'")
         statement.execute("ALTER TABLE book_files ADD COLUMN IF NOT EXISTS last_read_at BIGINT")
         connection.createIndexIfMissing("idx_book_files_raw_sha256", "CREATE INDEX IF NOT EXISTS idx_book_files_raw_sha256 ON book_files(raw_sha256)")
         connection.createIndexIfMissing("idx_book_files_book_id", "CREATE INDEX IF NOT EXISTS idx_book_files_book_id ON book_files(book_id)")
+        connection.createIndexIfMissing("idx_book_files_duplicate", "CREATE INDEX IF NOT EXISTS idx_book_files_duplicate ON book_files(duplicate_of_file_id)")
+        connection.createIndexIfMissing("idx_book_files_name_size_mtime", "CREATE INDEX IF NOT EXISTS idx_book_files_name_size_mtime ON book_files(original_filename, size_bytes, last_modified_millis)")
+        connection.createIndexIfMissing("idx_book_files_name_size_hash", "CREATE INDEX IF NOT EXISTS idx_book_files_name_size_hash ON book_files(original_filename, size_bytes, raw_sha256)")
         connection.createIndexIfMissing("idx_book_files_updated_at", "CREATE INDEX IF NOT EXISTS idx_book_files_updated_at ON book_files(updated_at)")
         connection.createIndexIfMissing("idx_book_files_reading_order", "CREATE INDEX IF NOT EXISTS idx_book_files_reading_order ON book_files(reading_status, last_read_at)")
         statement.execute(
@@ -470,31 +475,32 @@ private class JdbcBookFileRepository(private val connection: Connection) : BookF
         connection.prepareStatement(
             """
             MERGE INTO book_files(
-                id, book_id, body_id, body_cluster_id, raw_sha256, format, mime_type, size_bytes,
+                id, book_id, body_id, body_cluster_id, duplicate_of_file_id, raw_sha256, format,
-                original_filename, storage_kind, storage_uri, content_object_id, last_modified_millis,
+                mime_type, size_bytes, original_filename, storage_kind, storage_uri, content_object_id,
-                last_seen_at, reading_status, last_read_at, created_at, updated_at
+                last_modified_millis, last_seen_at, reading_status, last_read_at, created_at, updated_at
             )
-            KEY(id) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+            KEY(id) VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
             """.trimIndent()
         ).use { statement ->
             statement.setString(1, file.id)
             statement.setStringOrNull(2, file.bookId)
             statement.setStringOrNull(3, file.bodyId)
             statement.setStringOrNull(4, file.bodyClusterId)
-            statement.setString(5, file.rawSha256)
+            statement.setStringOrNull(5, file.duplicateOfFileId)
-            statement.setStringOrNull(6, file.format)
+            statement.setString(6, file.rawSha256)
-            statement.setStringOrNull(7, file.mimeType)
+            statement.setStringOrNull(7, file.format)
-            statement.setLongOrNull(8, file.sizeBytes)
+            statement.setStringOrNull(8, file.mimeType)
-            statement.setStringOrNull(9, file.originalFilename)
+            statement.setLongOrNull(9, file.sizeBytes)
-            statement.setString(10, file.storageKind.name)
+            statement.setStringOrNull(10, file.originalFilename)
-            statement.setStringOrNull(11, file.storageUri)
+            statement.setString(11, file.storageKind.name)
-            statement.setStringOrNull(12, file.contentObjectId)
+            statement.setStringOrNull(12, file.storageUri)
-            statement.setLongOrNull(13, file.lastModifiedMillis)
+            statement.setStringOrNull(13, file.contentObjectId)
-            statement.setLongOrNull(14, file.lastSeenAt)
+            statement.setLongOrNull(14, file.lastModifiedMillis)
-            statement.setString(15, file.readingStatus.name)
+            statement.setLongOrNull(15, file.lastSeenAt)
-            statement.setLongOrNull(16, file.lastReadAt)
+            statement.setString(16, file.readingStatus.name)
-            statement.setLong(17, file.createdAt)
+            statement.setLongOrNull(17, file.lastReadAt)
-            statement.setLong(18, file.updatedAt)
+            statement.setLong(18, file.createdAt)
+            statement.setLong(19, file.updatedAt)
             statement.executeUpdate()
         }
     }
@@ -534,27 +540,133 @@ private class JdbcBookFileRepository(private val connection: Connection) : BookF
         }
     }
 
-    override fun listLibraryFiles(limit: Int, offset: Int): List<LibraryFileRecord> {
+    override fun findByOriginalFilenameSizeAndModified(
+        originalFilename: String,
+        sizeBytes: Long,
+        lastModifiedMillis: Long,
+    ): List<BookFileRecord> {
         return connection.prepareStatement(
             """
-            WITH visible_files AS (
+            SELECT * FROM book_files
-                SELECT
+            WHERE original_filename = ?
-                    f.*,
+              AND size_bytes = ?
-                    ROW_NUMBER() OVER (
+              AND last_modified_millis = ?
-                        PARTITION BY COALESCE(f.body_cluster_id, f.body_id, f.book_id, f.raw_sha256, f.id)
+            ORDER BY created_at
+            """.trimIndent()
+        ).use { statement ->
+            statement.setString(1, originalFilename)
+            statement.setLong(2, sizeBytes)
+            statement.setLong(3, lastModifiedMillis)
+            statement.executeQuery().use { resultSet -> resultSet.mapRows { it.toBookFileRecord() } }
+        }
+    }
+
+    override fun findByOriginalFilenameSizeAndRawSha256(
+        originalFilename: String,
+        sizeBytes: Long,
+        rawSha256: String,
+    ): List<BookFileRecord> {
+        return connection.prepareStatement(
+            """
+            SELECT * FROM book_files
+            WHERE original_filename = ?
+              AND size_bytes = ?
+              AND raw_sha256 = ?
+            ORDER BY created_at
+            """.trimIndent()
+        ).use { statement ->
+            statement.setString(1, originalFilename)
+            statement.setLong(2, sizeBytes)
+            statement.setString(3, rawSha256)
+            statement.executeQuery().use { resultSet -> resultSet.mapRows { it.toBookFileRecord() } }
+        }
+    }
+
+    override fun findPrimaryDuplicateTarget(bodyClusterId: String?, bodyId: String?, rawSha256: String): BookFileRecord? {
+        return connection.prepareStatement(
+            """
+            SELECT * FROM book_files
+            WHERE duplicate_of_file_id IS NULL
+              AND (
+                    (? IS NOT NULL AND body_cluster_id = ?)
+                 OR (? IS NOT NULL AND body_id = ?)
+                 OR raw_sha256 = ?
+              )
             ORDER BY
                 CASE
-                                WHEN LOWER(COALESCE(f.format, '')) = 'fb2.zip'
+                    WHEN LOWER(COALESCE(format, '')) = 'fb2.zip'
-                                  OR LOWER(COALESCE(f.original_filename, '')) LIKE '%.fb2.zip'
+                      OR LOWER(COALESCE(original_filename, '')) LIKE '%.fb2.zip'
                     THEN 0 ELSE 1
                 END,
-                            CASE WHEN f.reading_status = 'READING' THEN 0 ELSE 1 END,
+                CASE WHEN reading_status = 'READING' THEN 0 ELSE 1 END,
-                            f.last_read_at DESC NULLS LAST,
+                last_read_at DESC NULLS LAST,
-                            f.updated_at DESC,
+                updated_at DESC,
-                            f.id
+                id
+            LIMIT 1
+            """.trimIndent()
+        ).use { statement ->
+            statement.setStringOrNull(1, bodyClusterId)
+            statement.setStringOrNull(2, bodyClusterId)
+            statement.setStringOrNull(3, bodyId)
+            statement.setStringOrNull(4, bodyId)
+            statement.setString(5, rawSha256)
+            statement.executeQuery().use { resultSet ->
+                if (resultSet.next()) resultSet.toBookFileRecord() else null
+            }
+        }
+    }
+
+    override fun markDuplicateFiles(): Int {
+        val now = System.currentTimeMillis()
+        return connection.prepareStatement(
+            """
+            MERGE INTO book_files(id, duplicate_of_file_id, updated_at)
+            KEY(id)
+            SELECT id, primary_file_id, ?
+            FROM (
+                SELECT
+                    id,
+                    FIRST_VALUE(id) OVER (
+                        PARTITION BY COALESCE(body_cluster_id, body_id, book_id, raw_sha256, id)
+                        ORDER BY
+                            CASE
+                                WHEN LOWER(COALESCE(format, '')) = 'fb2.zip'
+                                  OR LOWER(COALESCE(original_filename, '')) LIKE '%.fb2.zip'
+                                THEN 0 ELSE 1
+                            END,
+                            CASE WHEN reading_status = 'READING' THEN 0 ELSE 1 END,
+                            last_read_at DESC NULLS LAST,
+                            updated_at DESC,
+                            id
+                    ) AS primary_file_id,
+                    ROW_NUMBER() OVER (
+                        PARTITION BY COALESCE(body_cluster_id, body_id, book_id, raw_sha256, id)
+                        ORDER BY
+                            CASE
+                                WHEN LOWER(COALESCE(format, '')) = 'fb2.zip'
+                                  OR LOWER(COALESCE(original_filename, '')) LIKE '%.fb2.zip'
+                                THEN 0 ELSE 1
+                            END,
+                            CASE WHEN reading_status = 'READING' THEN 0 ELSE 1 END,
+                            last_read_at DESC NULLS LAST,
+                            updated_at DESC,
+                            id
                     ) AS duplicate_rank
-                FROM book_files f
+                FROM book_files
-            )
+                WHERE duplicate_of_file_id IS NULL
+            ) ranked
+            WHERE duplicate_rank > 1
+            """.trimIndent()
+        ).use { statement ->
+            statement.setLong(1, now)
+            statement.executeUpdate()
+        }
+    }
+
+    override fun listLibraryFiles(limit: Int, offset: Int): List<LibraryFileRecord> {
+        markDuplicateFiles()
+        return connection.prepareStatement(
+            """
             SELECT
                 f.id AS file_id,
                 f.book_id AS book_id,
@@ -569,9 +681,9 @@ private class JdbcBookFileRepository(private val connection: Connection) : BookF
                 f.last_seen_at AS last_seen_at,
                 f.reading_status AS reading_status,
                 f.last_read_at AS last_read_at
-            FROM visible_files f
+            FROM book_files f
             LEFT JOIN books b ON b.id = f.book_id
-            WHERE f.duplicate_rank = 1
+            WHERE f.duplicate_of_file_id IS NULL
             ORDER BY
                 CASE WHEN f.reading_status = 'READING' THEN 0 ELSE 1 END,
                 CASE WHEN f.reading_status = 'READING' THEN f.last_read_at END DESC NULLS LAST,
@@ -836,6 +948,7 @@ private fun ResultSet.toBookFileRecord() = BookFileRecord(
     bookId = getString("book_id"),
     bodyId = getString("body_id"),
     bodyClusterId = getString("body_cluster_id"),
+    duplicateOfFileId = getString("duplicate_of_file_id"),
     rawSha256 = getString("raw_sha256"),
     format = getString("format"),
     mimeType = getString("mime_type"),

shared/src/jdbcMain/kotlin/net/sergeych/toread/storage/jdbc/LibraryScanner.kt

@@ -82,20 +82,50 @@ class LibraryScanner(
         lastModifiedMillis: Long?,
     ): Boolean {
         val rawSha256 = bytes.sha256Hex()
-        if (database.files.findByRawSha256(rawSha256).isNotEmpty()) return false
+        if (sizeBytes != null && database.files.findByOriginalFilenameSizeAndRawSha256(displayName, sizeBytes, rawSha256).isNotEmpty()) {
+            return false
+        }
+
+        val now = System.currentTimeMillis()
+        database.files.findPrimaryDuplicateTarget(bodyClusterId = null, bodyId = null, rawSha256 = rawSha256)?.let { duplicateTarget ->
+            database.files.upsert(
+                BookFileRecord(
+                    id = "file-${UUID.randomUUID()}",
+                    bookId = duplicateTarget.bookId,
+                    bodyId = duplicateTarget.bodyId,
+                    bodyClusterId = duplicateTarget.bodyClusterId,
+                    duplicateOfFileId = duplicateTarget.id,
+                    rawSha256 = rawSha256,
+                    format = displayName.bookFormat(),
+                    mimeType = displayName.bookMimeType(),
+                    sizeBytes = sizeBytes,
+                    originalFilename = displayName,
+                    storageKind = BookFileStorageKind.EXTERNAL_URI,
+                    storageUri = storageUri,
+                    lastModifiedMillis = lastModifiedMillis,
+                    lastSeenAt = now,
+                    createdAt = now,
+                    updatedAt = now,
+                )
+            )
+            return true
+        }
 
         val book = Fb2Format.parse(bytes, displayName)
         val cover = book.coverImage()
         val canonicalText = book.canonicalText()
         val bodyHash = canonicalText.encodeToByteArray().sha256Hex()
-        val now = System.currentTimeMillis()
         val knownBody = database.bodies.findByExactTextHash(bodyHash, CanonicalizationVersion)
         val bodyId = knownBody?.id ?: "body-${UUID.randomUUID()}"
         val knownCluster = knownBody?.let { database.clusters.findByRepresentativeBodyId(it.id) }
         val clusterId = knownCluster?.id ?: "cluster-${UUID.randomUUID()}"
-        val bookId = "book-${UUID.randomUUID()}"
+        val duplicateTarget = knownBody?.let {
+            database.files.findPrimaryDuplicateTarget(bodyClusterId = clusterId, bodyId = bodyId, rawSha256 = rawSha256)
+        }
+        val bookId = duplicateTarget?.bookId ?: "book-${UUID.randomUUID()}"
 
         database.transaction {
+            if (duplicateTarget == null || duplicateTarget.bookId == null) {
                 books.upsert(
                     BookRecord(
                         id = bookId,
@@ -110,6 +140,7 @@ class LibraryScanner(
                         updatedAt = now,
                     )
                 )
+            }
             if (knownBody == null) {
                 bodies.upsert(
                     BookBodyRecord(
@@ -143,6 +174,7 @@ class LibraryScanner(
                     bookId = bookId,
                     bodyId = bodyId,
                     bodyClusterId = clusterId,
+                    duplicateOfFileId = duplicateTarget?.id,
                     rawSha256 = rawSha256,
                     format = displayName.bookFormat(),
                     mimeType = displayName.bookMimeType(),
@@ -160,14 +192,27 @@ class LibraryScanner(
         return true
     }
 
-    private fun importLinkedFile(file: File): Boolean =
+    private fun importLinkedFile(file: File): Boolean {
-        importExternalFile(
+        val sizeBytes = file.length()
+        val lastModifiedMillis = file.lastModified()
+        if (database.files.findByOriginalFilenameSizeAndModified(file.name, sizeBytes, lastModifiedMillis).isNotEmpty()) {
+            return false
+        }
+        return importExternalFile(
             bytes = file.readBytes(),
             displayName = file.name,
             storageUri = file.absolutePath,
-            sizeBytes = file.length(),
+            sizeBytes = sizeBytes,
-            lastModifiedMillis = file.lastModified(),
+            lastModifiedMillis = lastModifiedMillis,
         )
+    }
+
+    companion object {
+        fun countSupportedBookFiles(root: File): Int {
+            require(root.isDirectory) { "Scan root is not a directory: ${root.path}" }
+            return root.walkTopDown().count { it.isFile && it.isSupportedBookFile() }
+        }
+    }
 }
 
 private const val CanonicalizationVersion = 1

shared/src/jvmTest/kotlin/net/sergeych/toread/storage/jdbc/LibraryScannerTest.kt

@@ -1,9 +1,11 @@
 package net.sergeych.toread.storage.jdbc
 
 import java.io.File
+import java.nio.file.Files
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertNotNull
+import kotlin.test.assertNull
 import kotlin.test.assertTrue
 
 class LibraryScannerTest {
@@ -35,6 +37,61 @@ class LibraryScannerTest {
         }
     }
 
+    @Test
+    fun scanMarksImportedDuplicateFilesImmediately() {
+        val root = findProjectRoot()
+        val source = File(root, "test_books/Maraini_Zapiski-Terezy-Numy.G7vc8A.872381.fb2.zip")
+        val tempDir = Files.createTempDirectory("yereed-dupe-scan").toFile()
+        try {
+            source.copyTo(File(tempDir, source.name))
+            source.copyTo(File(tempDir, "same-book-different-name.fb2.zip"))
+
+            val db = H2LibraryDatabase.openMemory("scanMarksImportedDuplicateFilesImmediately")
+            try {
+                val summary = LibraryScanner(db).scanSubtree(tempDir)
+
+                assertEquals(2, summary.scannedFiles)
+                assertEquals(2, summary.importedFiles)
+                assertEquals(0, summary.skippedFiles)
+
+                val files = db.files.list().sortedBy { it.duplicateOfFileId != null }
+                assertEquals(2, files.size)
+                assertNull(files.first().duplicateOfFileId)
+                assertEquals(files.first().id, files.last().duplicateOfFileId)
+                assertEquals(1, db.files.listLibraryFiles().size)
+
+                val second = LibraryScanner(db).scanSubtree(tempDir)
+                assertEquals(0, second.importedFiles)
+                assertEquals(2, second.skippedFiles)
+            } finally {
+                db.close()
+            }
+        } finally {
+            tempDir.deleteRecursively()
+        }
+    }
+
+    @Test
+    fun listingLibraryFilesPersistsLegacyDuplicateMarkers() {
+        val root = findProjectRoot()
+        val bytes = File(root, "test_books/Maraini_Zapiski-Terezy-Numy.G7vc8A.872381.fb2.zip").readBytes()
+        val db = H2LibraryDatabase.openMemory("listingLibraryFilesPersistsLegacyDuplicateMarkers")
+        try {
+            val scanner = LibraryScanner(db)
+            assertTrue(scanner.importExternalFile(bytes, "primary.fb2.zip", "/tmp/primary.fb2.zip", bytes.size.toLong(), 1L))
+            assertTrue(scanner.importExternalFile(bytes, "secondary.fb2.zip", "/tmp/secondary.fb2.zip", bytes.size.toLong(), 2L))
+
+            val duplicate = db.files.list().single { it.duplicateOfFileId != null }
+            db.files.upsert(duplicate.copy(duplicateOfFileId = null))
+
+            assertEquals(2, db.files.list().count { it.duplicateOfFileId == null })
+            assertEquals(1, db.files.listLibraryFiles().size)
+            assertEquals(1, db.files.list().count { it.duplicateOfFileId != null })
+        } finally {
+            db.close()
+        }
+    }
+
     private fun findProjectRoot(): File {
         var current = File(System.getProperty("user.dir")).absoluteFile
         while (true) {