Remove Home screen

app/build.gradle.kts

@@ -3,7 +3,6 @@ plugins {
     alias(libs.plugins.kotlin.android)
     alias(libs.plugins.kotlin.compose)
     alias(libs.plugins.aboutLibrariesAndroid)
-    alias(libs.plugins.protobuf)
     alias(libs.plugins.kotlin.serialization)
 }
 
@@ -122,10 +121,8 @@ dependencies {
     implementation(libs.androidx.camera.camera2)
     implementation(libs.androidx.camera.lifecycle)
     implementation(libs.androidx.camera.view)
-    implementation(libs.androidx.datastore)
     implementation(libs.androidx.datastore.preferences)
     implementation(libs.androidx.documentfile)
-    implementation(libs.protobuf.javalite)
     implementation(libs.litert)
     implementation(libs.litert.support)
     implementation(libs.litert.metadata)
@@ -160,21 +157,6 @@ aboutLibraries {
     }
 }
 
-protobuf {
-    protoc {
-        artifact = "com.google.protobuf:protoc:4.32.0"
-    }
-    generateProtoTasks {
-        all().forEach { task ->
-            task.builtins {
-                create("java") {
-                    option("lite")
-                }
-            }
-        }
-    }
-}
-
 // See https://developer.android.com/build/configure-apk-splits
 androidComponents {
     onVariants { variant ->

app/src/main/java/org/fairscan/app/FairScanApp.kt

@@ -23,12 +23,10 @@ import androidx.lifecycle.viewmodel.CreationExtras
 import org.fairscan.app.data.FileLogger
 import org.fairscan.app.data.FileManager
 import org.fairscan.app.data.LogRepository
-import org.fairscan.app.data.recentDocumentsDataStore
 import org.fairscan.app.domain.ImageSegmentationService
 import org.fairscan.app.platform.AndroidImageLoader
 import org.fairscan.app.platform.AndroidPdfWriter
 import org.fairscan.app.ui.screens.camera.CameraViewModel
-import org.fairscan.app.ui.screens.home.HomeViewModel
 import org.fairscan.app.ui.screens.settings.SettingsRepository
 import org.fairscan.app.ui.screens.settings.SettingsViewModel
 import java.io.File
@@ -57,7 +55,6 @@ class AppContainer(context: Context) {
     val logger = FileLogger(logRepository)
     val imageSegmentationService = ImageSegmentationService(context, logger)
     val imageLoader = AndroidImageLoader(context.contentResolver)
-    val recentDocumentsDataStore = context.recentDocumentsDataStore
     val settingsRepository = SettingsRepository(context)
 
     @Suppress("UNCHECKED_CAST")
@@ -69,7 +66,6 @@ class AppContainer(context: Context) {
         }
     }
 
-    val homeViewModelFactory = viewModelFactory { HomeViewModel(it, context) }
     val cameraViewModelFactory = viewModelFactory { CameraViewModel(it) }
     val settingsViewModelFactory = viewModelFactory { SettingsViewModel(it) }
 

app/src/main/java/org/fairscan/app/MainActivity.kt

@@ -54,7 +54,6 @@ import org.fairscan.app.data.ImageRepository
 import org.fairscan.app.ui.Navigation
 import org.fairscan.app.ui.Screen
 import org.fairscan.app.ui.components.rememberCameraPermissionState
-import org.fairscan.app.ui.screens.document.DocumentScreen
 import org.fairscan.app.ui.screens.LibrariesScreen
 import org.fairscan.app.ui.screens.about.AboutEvent
 import org.fairscan.app.ui.screens.about.AboutScreen
@@ -63,14 +62,12 @@ import org.fairscan.app.ui.screens.about.createEmailWithImageIntent
 import org.fairscan.app.ui.screens.camera.CameraEvent
 import org.fairscan.app.ui.screens.camera.CameraScreen
 import org.fairscan.app.ui.screens.camera.CameraViewModel
+import org.fairscan.app.ui.screens.document.DocumentScreen
 import org.fairscan.app.ui.screens.export.ExportActions
 import org.fairscan.app.ui.screens.export.ExportEvent
 import org.fairscan.app.ui.screens.export.ExportResult
 import org.fairscan.app.ui.screens.export.ExportScreenWrapper
 import org.fairscan.app.ui.screens.export.ExportViewModel
-import org.fairscan.app.ui.screens.home.HomeScreen
-import org.fairscan.app.ui.screens.home.HomeViewModel
-import org.fairscan.app.ui.screens.settings.ExportFormat
 import org.fairscan.app.ui.screens.settings.SettingsScreen
 import org.fairscan.app.ui.screens.settings.SettingsViewModel
 import org.fairscan.app.ui.theme.FairScanTheme
@@ -97,7 +94,7 @@ class MainActivity : ComponentActivity() {
         val imageRepository = sessionViewModel.imageRepository
         val viewModel: MainViewModel by viewModels {
             appContainer.viewModelFactory {
-                MainViewModel(imageRepository, launchMode)
+                MainViewModel(imageRepository)
             }
         }
         val exportViewModel: ExportViewModel by viewModels {
@@ -110,7 +107,6 @@ class MainActivity : ComponentActivity() {
                 AboutViewModel(appContainer, imageRepository)
             }
         }
-        val homeViewModel: HomeViewModel by viewModels { appContainer.homeViewModelFactory }
         val cameraViewModel: CameraViewModel by viewModels { appContainer.cameraViewModelFactory }
 
         val settingsViewModel: SettingsViewModel
@@ -157,16 +153,8 @@ class MainActivity : ComponentActivity() {
                 }
 
                 when (currentScreen) {
-                    is Screen.Main.Home -> {
+                    null -> {
-                        val recentDocs by homeViewModel.recentDocuments.collectAsStateWithLifecycle()
+                        // waiting to load pages to get an initial screen
-                        HomeScreen(
-                            cameraPermission = cameraPermission,
-                            currentDocument = document,
-                            navigation = navigation,
-                            onClearScan = { viewModel.startNewDocument() },
-                            recentDocuments = recentDocs,
-                            onOpenPdf = { fileUri -> openUri(fileUri, ExportFormat.PDF.mimeType, logger) }
-                        )
                     }
                     is Screen.Main.Camera -> {
                         val pickMultiple = rememberLauncherForActivityResult(
@@ -216,7 +204,7 @@ class MainActivity : ComponentActivity() {
                             onCloseScan = {
                                 exportViewModel.resetFilename()
                                 viewModel.startNewDocument()
-                                viewModel.navigateTo(Screen.Main.Home)
+                                viewModel.navigateTo(Screen.Main.Camera)
                             }
                         )
                     }
@@ -468,7 +456,6 @@ class MainActivity : ComponentActivity() {
     }
 
     private fun navigation(viewModel: MainViewModel, launchMode: LaunchMode): Navigation = Navigation(
-        toHomeScreen = { viewModel.navigateTo(Screen.Main.Home) },
         toCameraScreen = { viewModel.navigateTo(Screen.Main.Camera) },
         toDocumentScreen = { viewModel.navigateTo(Screen.Main.Document()) },
         toExportScreen = { viewModel.navigateTo(Screen.Main.Export) },

app/src/main/java/org/fairscan/app/MainViewModel.kt

@@ -45,17 +45,27 @@ import org.fairscan.imageprocessing.ColorMode
 import kotlin.math.min
 
 @OptIn(ExperimentalCoroutinesApi::class)
-class MainViewModel(val imageRepository: ImageRepository, launchMode: LaunchMode): ViewModel() {
+class MainViewModel(val imageRepository: ImageRepository): ViewModel() {
 
-    private val _navigationState = MutableStateFlow(NavigationState.initial(launchMode))
+    private val _navigationState = MutableStateFlow<NavigationState?>(null)
-    val currentScreen: StateFlow<Screen> = _navigationState.map { it.current }
+    val currentScreen: StateFlow<Screen?> = _navigationState.map { it?.current }
-        .stateIn(viewModelScope, SharingStarted.Eagerly, _navigationState.value.current)
+        .stateIn(viewModelScope, SharingStarted.Eagerly, null)
 
     private val _pages = MutableStateFlow<List<ScanPage>>(emptyList())
 
+
     init {
         viewModelScope.launch {
-            _pages.value = imageRepository.pages()
+            val pages = imageRepository.pages()
+
+            _pages.value = pages
+
+            _navigationState.value =
+                if (pages.isEmpty()) {
+                    NavigationState.initial()
+                } else {
+                    NavigationState.initial().navigateTo(Screen.Main.Export)
+                }
         }
     }
 
@@ -110,11 +120,11 @@ class MainViewModel(val imageRepository: ImageRepository, launchMode: LaunchMode
             }
             _currentPageIndex.value = min(_pages.value.size - 1, destination.initialPage)
         }
-        _navigationState.update { it.navigateTo(destination) }
+        _navigationState.update { it?.navigateTo(destination) }
     }
 
     fun navigateBack() {
-        _navigationState.update { stack -> stack.navigateBack() }
+        _navigationState.update { stack -> stack?.navigateBack() }
     }
 
     fun rotateCurrentPage(clockwise: Boolean) {

app/src/main/java/org/fairscan/app/data/RecentDocuments.kt

@@ -1,47 +0,0 @@
-/*
- * Copyright 2025-2026 Pierre-Yves Nicolas
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <https://www.gnu.org/licenses/>.
- */
-package org.fairscan.app.data
-
-import android.content.Context
-import androidx.datastore.core.CorruptionException
-import androidx.datastore.core.DataStore
-import androidx.datastore.core.Serializer
-import androidx.datastore.dataStore
-import com.google.protobuf.InvalidProtocolBufferException
-import org.fairscan.app.RecentDocuments
-import java.io.InputStream
-import java.io.OutputStream
-
-object RecentDocumentsSerializer : Serializer<RecentDocuments> {
-    override val defaultValue: RecentDocuments = RecentDocuments.getDefaultInstance()
-
-    override suspend fun readFrom(input: InputStream): RecentDocuments {
-        return try {
-            RecentDocuments.parseFrom(input)
-        } catch (e: InvalidProtocolBufferException) {
-            throw CorruptionException("Cannot read proto.", e)
-        }
-    }
-
-    override suspend fun writeTo(
-        t: RecentDocuments,
-        output: OutputStream
-    ) = t.writeTo(output)
-}
-
-val Context.recentDocumentsDataStore: DataStore<RecentDocuments> by dataStore(
-    fileName = "recent_documents.pb",
-    serializer = RecentDocumentsSerializer
-)

app/src/main/java/org/fairscan/app/ui/Navigation.kt

@@ -14,11 +14,8 @@
  */
 package org.fairscan.app.ui
 
-import org.fairscan.app.LaunchMode
-
 sealed class Screen {
     sealed class Main : Screen() {
-        object Home : Main()
         object Camera : Main()
         data class Document(val initialPage: Int = 0) : Main()
         object Export : Main()
@@ -31,7 +28,6 @@ sealed class Screen {
 }
 
 data class Navigation(
-    val toHomeScreen: () -> Unit,
     val toCameraScreen: () -> Unit,
     val toDocumentScreen: () -> Unit,
     val toExportScreen: () -> Unit,
@@ -41,18 +37,12 @@ data class Navigation(
     val back: () -> Unit,
 )
 
-fun startScreenFor(mode: LaunchMode): Screen.Main =
-    when (mode) {
-        LaunchMode.NORMAL -> Screen.Main.Home
-        LaunchMode.EXTERNAL_SCAN_TO_PDF -> Screen.Main.Camera
-    }
-
 @ConsistentCopyVisibility
 data class NavigationState private constructor(val stack: List<Screen>, val root: Screen.Main) {
 
     companion object {
-        fun initial(mode: LaunchMode): NavigationState {
+        fun initial(): NavigationState {
-            val root = startScreenFor(mode)
+            val root = Screen.Main.Camera
             return NavigationState(listOf(root), root)
         }
     }
@@ -70,8 +60,7 @@ data class NavigationState private constructor(val stack: List<Screen>, val root
     fun navigateBack(): NavigationState {
         return when (current) {
             root -> this // Back handled by system
-            is Screen.Main.Home -> this // Back handled by system
+            is Screen.Main.Camera -> this // Back handled by system
-            is Screen.Main.Camera -> copy(stack = listOf(Screen.Main.Home))
             is Screen.Main.Document -> copy(stack = listOf(Screen.Main.Camera))
             is Screen.Main.Export -> copy(stack = listOf(Screen.Main.Camera))
             is Screen.Overlay -> copy(stack = stack.dropLast(1))

app/src/main/java/org/fairscan/app/ui/PreviewUtils.kt

@@ -16,7 +16,6 @@ package org.fairscan.app.ui
 
 import android.content.Context
 import kotlinx.collections.immutable.ImmutableList
-import kotlinx.collections.immutable.persistentListOf
 import kotlinx.collections.immutable.toImmutableList
 import org.fairscan.app.domain.Jpeg
 import org.fairscan.app.domain.PageViewKey
@@ -26,11 +25,7 @@ import org.fairscan.app.ui.state.PageThumbnail
 import org.fairscan.imageprocessing.ColorMode
 
 fun dummyNavigation(): Navigation {
-    return Navigation({}, {}, {}, {}, {}, {}, {}, {})
+    return Navigation({}, {}, {}, {}, {}, {}, {})
-}
-
-fun fakeDocument(): DocumentUiModel {
-    return DocumentUiModel(persistentListOf())
 }
 
 fun fakeDocument(pageIds: ImmutableList<String>, context: Context): DocumentUiModel {

app/src/main/java/org/fairscan/app/ui/screens/camera/CameraScreen.kt

@@ -141,8 +141,6 @@ fun CameraScreen(
     val isTorchEnabled by cameraViewModel.isTorchEnabled.collectAsStateWithLifecycle()
     var torchReapplied by remember { mutableStateOf(false) }
 
-    BackHandler { navigation.back() }
-
     val captureController = remember { CameraCaptureController() }
     DisposableEffect(Unit) {
         onDispose {

app/src/main/java/org/fairscan/app/ui/screens/export/ExportViewModel.kt

@@ -42,7 +42,6 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import org.fairscan.app.AppContainer
 import org.fairscan.app.R
-import org.fairscan.app.RecentDocument
 import org.fairscan.app.data.FileManager
 import org.fairscan.app.data.ImageRepository
 import org.fairscan.app.domain.ExportQuality
@@ -69,7 +68,6 @@ class ExportViewModel(container: AppContainer, val imageRepository: ImageReposit
     private val preparationDir = container.preparationDir
     private val fileManager = container.fileManager
     private val settingsRepository = container.settingsRepository
-    private val recentDocumentsDataStore = container.recentDocumentsDataStore
     private val logger = container.logger
 
     private val _events = MutableSharedFlow<ExportEvent>()
@@ -310,12 +308,6 @@ class ExportViewModel(container: AppContainer, val imageRepository: ImageReposit
         val bundle = SavedBundle(savedItems, saveDir)
         _uiState.update { it.copy(savedBundle = bundle) }
 
-        if (exportFormat == ExportFormat.PDF) {
-            savedItems.forEach { item ->
-                addRecentDocument(item.uri, item.fileName, result.pageCount)
-            }
-        }
-
         filesForMediaScan.forEach { f -> mediaScan(context, f, exportFormat.mimeType) }
     }
 
@@ -395,27 +387,6 @@ class ExportViewModel(container: AppContainer, val imageRepository: ImageReposit
             DocumentFile.fromTreeUri(context, exportDirUri)?.name
         }
     }
-
-    fun addRecentDocument(fileUri: Uri, fileName: String, pageCount: Int) {
-        viewModelScope.launch {
-            recentDocumentsDataStore.updateData { current ->
-                val newDoc = RecentDocument.newBuilder()
-                    .setFileUri(fileUri.toString())
-                    .setFileName(fileName)
-                    .setPageCount(pageCount)
-                    .setCreatedAt(System.currentTimeMillis())
-                    .build()
-                current.toBuilder()
-                    .addDocuments(0, newDoc)
-                    .also { builder ->
-                        while (builder.documentsCount > 3) {
-                            builder.removeDocuments(builder.documentsCount - 1)
-                        }
-                    }
-                    .build()
-            }
-        }
-    }
 }
 
 data class ExportPreparationKey(

app/src/main/java/org/fairscan/app/ui/screens/home/HomeScreen.kt

@@ -1,296 +0,0 @@
-/*
- * Copyright 2025-2026 Pierre-Yves Nicolas
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <https://www.gnu.org/licenses/>.
- */
-package org.fairscan.app.ui.screens.home
-
-import android.net.Uri
-import androidx.compose.foundation.Image
-import androidx.compose.foundation.clickable
-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.width
-import androidx.compose.foundation.rememberScrollState
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.foundation.verticalScroll
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.DeleteOutline
-import androidx.compose.material.icons.filled.PhotoCamera
-import androidx.compose.material.icons.filled.PictureAsPdf
-import androidx.compose.material3.Button
-import androidx.compose.material3.ButtonDefaults
-import androidx.compose.material3.Card
-import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
-import androidx.compose.material3.ListItem
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.Scaffold
-import androidx.compose.material3.Surface
-import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.Alignment
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
-import androidx.compose.ui.graphics.asImageBitmap
-import androidx.compose.ui.layout.ContentScale
-import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.tooling.preview.Preview
-import androidx.compose.ui.unit.dp
-import androidx.core.net.toUri
-import kotlinx.collections.immutable.persistentListOf
-import org.fairscan.app.R
-import org.fairscan.app.ui.Navigation
-import org.fairscan.app.ui.components.AppOverflowMenu
-import org.fairscan.app.ui.components.CameraPermissionState
-import org.fairscan.app.ui.components.formatDate
-import org.fairscan.app.ui.components.pageCountText
-import org.fairscan.app.ui.components.rememberCameraPermissionState
-import org.fairscan.app.ui.dummyNavigation
-import org.fairscan.app.ui.fakeDocument
-import org.fairscan.app.ui.state.DocumentUiModel
-import org.fairscan.app.ui.theme.FairScanTheme
-import java.io.File
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-fun HomeScreen(
-    cameraPermission: CameraPermissionState,
-    currentDocument: DocumentUiModel,
-    navigation: Navigation,
-    onClearScan: () -> Unit,
-    recentDocuments: List<RecentDocumentUiState>,
-    onOpenPdf: (Uri) -> Unit,
-) {
-    Scaffold (
-        topBar = {
-            TopAppBar(
-                title = { Text(stringResource(R.string.app_name)) },
-                actions = { AppOverflowMenu(navigation) }
-            )
-        },
-    ) { padding ->
-        Column (
-            modifier = Modifier
-                .padding(padding)
-                .fillMaxSize()
-                .verticalScroll(rememberScrollState())
-        ) {
-            Spacer(Modifier.weight(1f))
-
-            ScanButton(
-                onClick = {
-                    onClearScan()
-                    navigation.toCameraScreen()
-                },
-                Modifier.align(Alignment.CenterHorizontally)
-            )
-
-            Spacer(Modifier.weight(1f))
-
-            if (!currentDocument.isEmpty()) {
-                OngoingScanBanner(
-                    currentDocument,
-                    onResumeScan = navigation.toDocumentScreen,
-                    onClearScan = onClearScan,
-                )
-            } else if (recentDocuments.isNotEmpty()) {
-                RecentDocumentList(recentDocuments, onOpenPdf)
-            }
-        }
-    }
-}
-
-@Composable
-fun ScanButton(onClick: () -> Unit, modifier: Modifier) {
-    Button(
-        onClick = onClick,
-        modifier = modifier.padding(32.dp),
-        elevation = ButtonDefaults.buttonElevation(defaultElevation = 6.dp)
-    ) {
-        Icon(
-            imageVector = Icons.Default.PhotoCamera,
-            contentDescription = null,
-            modifier = Modifier.size(48.dp)
-        )
-        Spacer(Modifier.width(8.dp))
-        Text(
-            text = stringResource(R.string.scan_button),
-            style = MaterialTheme.typography.titleLarge
-        )
-
-    }
-}
-
-@Composable
-fun OngoingScanBanner(
-    currentDocument: DocumentUiModel,
-    onResumeScan: () -> Unit,
-    onClearScan: () -> Unit
-) {
-    Surface(
-        tonalElevation = 2.dp,
-        shadowElevation = 4.dp,
-    ) {
-        Row(
-            modifier = Modifier
-                .fillMaxWidth()
-                .padding(8.dp),
-            verticalAlignment = Alignment.CenterVertically
-        ) {
-            currentDocument.thumbnail(0)?.let {
-                Image(
-                    bitmap = it.asImageBitmap(),
-                    contentDescription = null,
-                    modifier = Modifier
-                        .size(60.dp)
-                        .clip(RoundedCornerShape(4.dp)),
-                    contentScale = ContentScale.Fit
-                )
-            }
-
-            Spacer(Modifier.width(12.dp))
-
-            Column(
-                modifier = Modifier.weight(1f)
-            ) {
-                Text(
-                    text = stringResource(R.string.scan_in_progress),
-                    style = MaterialTheme.typography.bodyLarge
-                )
-                Text(
-                    text = pageCountText(currentDocument.pageCount()),
-                    style = MaterialTheme.typography.bodyMedium,
-                    color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f))
-            }
-
-            IconButton(
-                onClick = onClearScan,
-                modifier = Modifier.size(24.dp)
-            ) {
-                Icon(
-                    imageVector = Icons.Default.DeleteOutline,
-                    contentDescription = stringResource(R.string.discard_scan),
-                    tint = MaterialTheme.colorScheme.primary
-                )
-            }
-            Spacer(Modifier.width(12.dp))
-            Button(onClick = onResumeScan) {
-                Text(stringResource(R.string.resume))
-            }
-        }
-    }
-}
-
-@Composable
-private fun RecentDocumentList(
-    recentDocuments: List<RecentDocumentUiState>,
-    onOpenPdf: (Uri) -> Unit
-) {
-    Spacer(Modifier.height(8.dp))
-    Text(
-        stringResource(R.string.last_saved_pdf_files),
-        style = MaterialTheme.typography.bodyMedium,
-        color = MaterialTheme.colorScheme.onSurfaceVariant,
-        modifier = Modifier.padding(start = 12.dp, bottom = 4.dp)
-    )
-    Column {
-        recentDocuments.forEach { doc ->
-            ListItem(
-                headlineContent = {
-                    Text(
-                        doc.fileName,
-                        style = MaterialTheme.typography.bodyMedium
-                    )
-                },
-                supportingContent = {
-                    Text(
-                        text = pageCountText(doc.pageCount) + " • " +
-                                formatDate(doc.saveTimestamp, LocalContext.current),
-                        style = MaterialTheme.typography.bodySmall,
-                        color = MaterialTheme.colorScheme.onSurfaceVariant
-                    )
-                },
-                leadingContent = {
-                    Icon(
-                        Icons.Default.PictureAsPdf,
-                        contentDescription = null,
-                        tint = MaterialTheme.colorScheme.onSurfaceVariant
-                    )
-                },
-                modifier = Modifier.clickable { onOpenPdf(doc.fileUri) }
-            )
-        }
-    }
-}
-
-@Preview
-@Composable
-fun HomeScreenPreviewOnFirstLaunch() {
-    FairScanTheme {
-        HomeScreen(
-            cameraPermission = rememberCameraPermissionState(),
-            currentDocument = fakeDocument(),
-            navigation = dummyNavigation(),
-            onClearScan = {},
-            recentDocuments = listOf(),
-            onOpenPdf = {},
-        )
-    }
-}
-
-@Preview
-@Composable
-fun HomeScreenPreviewWithCurrentDocument() {
-    FairScanTheme {
-        HomeScreen(
-            cameraPermission = rememberCameraPermissionState(),
-            currentDocument = fakeDocument(
-                persistentListOf("gallica.bnf.fr-bpt6k5530456s-1"),
-                LocalContext.current
-            ),
-            navigation = dummyNavigation(),
-            onClearScan = {},
-            recentDocuments = listOf(),
-            onOpenPdf = {},
-        )
-    }
-}
-
-@Preview
-@Composable
-fun HomeScreenPreviewWithLastSavedFiles() {
-    FairScanTheme {
-        HomeScreen(
-            cameraPermission = rememberCameraPermissionState(),
-            currentDocument = fakeDocument(),
-            navigation = dummyNavigation(),
-            onClearScan = {},
-            recentDocuments = listOf(
-                RecentDocumentUiState(
-                    File("/path/my_file.pdf").toUri(), "my_file.pdf", 1755971180000, 3),
-                RecentDocumentUiState(
-                    "content:///path/scan2.pdf".toUri(), "scan2.pdf",1755000500000, 1)
-            ),
-            onOpenPdf = {},
-        )
-    }
-}

app/src/main/java/org/fairscan/app/ui/screens/home/HomeUiState.kt

@@ -1,24 +0,0 @@
-/*
- * Copyright 2025-2026 Pierre-Yves Nicolas
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <https://www.gnu.org/licenses/>.
- */
-package org.fairscan.app.ui.screens.home
-
-import android.net.Uri
-
-data class RecentDocumentUiState(
-    val fileUri: Uri,
-    val fileName: String,
-    val saveTimestamp: Long,
-    val pageCount: Int,
-)

app/src/main/java/org/fairscan/app/ui/screens/home/HomeViewModel.kt

@@ -1,75 +0,0 @@
-/*
- * Copyright 2025-2026 Pierre-Yves Nicolas
- *
- * This program is free software: you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- * You should have received a copy of the GNU General Public License along with
- * this program. If not, see <https://www.gnu.org/licenses/>.
- */
-package org.fairscan.app.ui.screens.home
-
-import android.content.Context
-import android.net.Uri
-import androidx.core.net.toUri
-import androidx.documentfile.provider.DocumentFile
-import androidx.lifecycle.ViewModel
-import androidx.lifecycle.viewModelScope
-import kotlinx.coroutines.flow.SharingStarted
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.map
-import kotlinx.coroutines.flow.stateIn
-import org.fairscan.app.AppContainer
-import java.io.File
-
-class HomeViewModel(appContainer: AppContainer, appContext: Context): ViewModel() {
-
-    private val recentDocumentsDataStore = appContainer.recentDocumentsDataStore
-
-    val recentDocuments: StateFlow<List<RecentDocumentUiState>> =
-        recentDocumentsDataStore.data.map {
-            it.documentsList.mapNotNull { doc ->
-                var fileName = doc.fileName
-                var uri: Uri? = null
-                if (doc.fileUri.isNullOrEmpty()) {
-                    if (!doc.filePath.isNullOrEmpty()) {
-                        val file = File(doc.filePath)
-                        uri = file.toUri()
-                        fileName = file.name
-                    }
-                } else {
-                    uri = doc.fileUri.toUri()
-                }
-                if (uri != null) {
-                    RecentDocumentUiState(
-                        fileUri = uri,
-                        fileName = fileName,
-                        saveTimestamp = doc.createdAt,
-                        pageCount = doc.pageCount,
-                    )
-                } else null
-            }.filter { item -> uriExists(appContext, item.fileUri) }
-        }.stateIn(
-            scope = viewModelScope,
-            started = SharingStarted.WhileSubscribed(5_000),
-            initialValue = emptyList(),
-        )
-
-    private fun uriExists(context: Context, uri: Uri): Boolean {
-        return if (uri.scheme == "file") {
-            File(uri.path.orEmpty()).exists()
-        } else {
-            try {
-                DocumentFile.fromSingleUri(context, uri)?.exists() == true
-            } catch (_: Exception) {
-                false
-            }
-        }
-    }
-
-}

app/src/main/java/org/fairscan/app/ui/state/DocumentUiModel.kt

@@ -33,7 +33,7 @@ data class DocumentUiModel(
         return pages.lastIndex
     }
     fun thumbnail(index: Int): Bitmap? {
-        return pages[index].thumbnail?.toBitmap()
+        return pages.getOrNull(index)?.thumbnail?.toBitmap()
     }
 }
 

app/src/main/proto/recent_documents.proto

@@ -1,16 +0,0 @@
-syntax = "proto3";
-
-option java_package = "org.fairscan.app";
-option java_multiple_files = true;
-
-message RecentDocument {
-  string file_path = 1;
-  int64 created_at = 2; // timestamp in ms
-  int32 page_count = 3;
-  string file_uri = 4;
-  string file_name = 5;
-}
-
-message RecentDocuments {
-  repeated RecentDocument documents = 1;
-}

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

@@ -44,7 +44,6 @@
     <string name="filename">اسم الملف</string>
     <string name="grant_permission">امنح الأذن</string>
     <string name="import_photos">استيراد</string>
-    <string name="last_saved_pdf_files">ملفات PDF المحفوظة حديثًا على هذا الجهاز:</string>
     <string name="libraries">المكتبات</string>
     <string name="libraries_open_source">مكتبات مفتوحة المصدر</string>
     <string name="license">الترخيص</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">Název souboru</string>
     <string name="grant_permission">Povolit přístup</string>
     <string name="import_photos">Import</string>
-    <string name="last_saved_pdf_files">Poslední PDF uložené v tomto zařízení:</string>
     <string name="libraries">Kníhovny</string>
     <string name="libraries_open_source">Open-source knihovny</string>
     <string name="license">Licence</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">Dateiname</string>
     <string name="grant_permission">Berechtigung erteilen</string>
     <string name="import_photos">Importieren</string>
-    <string name="last_saved_pdf_files">Zuletzt auf diesem Gerät gespeicherte PDFs:</string>
     <string name="libraries">Bibliotheken</string>
     <string name="libraries_open_source">Open-Source-Bibliotheken</string>
     <string name="license">Lizenz</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">Nombre del archivo</string>
     <string name="grant_permission">Conceder permiso</string>
     <string name="import_photos">Importar</string>
-    <string name="last_saved_pdf_files">PDF recientes guardados en este dispositivo:</string>
     <string name="libraries">Bibliotecas</string>
     <string name="libraries_open_source">Bibliotecas de código abierto</string>
     <string name="license">Licencia</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">Nom de fichier</string>
     <string name="grant_permission">Autoriser</string>
     <string name="import_photos">Importer</string>
-    <string name="last_saved_pdf_files">Derniers PDF enregistrés sur l’appareil :</string>
     <string name="libraries">Bibliothèques</string>
     <string name="libraries_open_source">Bibliothèques open source</string>
     <string name="license">Licence</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">Nome do ficheiro</string>
     <string name="grant_permission">Conceder permiso</string>
     <string name="import_photos">Importar</string>
-    <string name="last_saved_pdf_files">PDF recentes gardados neste dispositivo:</string>
     <string name="libraries">Bibliotecas</string>
     <string name="libraries_open_source">Bibliotecas de código aberto</string>
     <string name="license">Licenza</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">Nome file</string>
     <string name="grant_permission">Concendi autorizzazione</string>
     <string name="import_photos">Importa</string>
-    <string name="last_saved_pdf_files">PDF recenti salvati su questo dispositivo:</string>
     <string name="libraries">Librerie</string>
     <string name="libraries_open_source">Librerie open source</string>
     <string name="license">Licenza</string>

app/src/main/res/values-pt-rBR/strings.xml

@@ -44,7 +44,6 @@
     <string name="filename">Nome do arquivo</string>
     <string name="grant_permission">Conceder permissão</string>
     <string name="import_photos">Importar</string>
-    <string name="last_saved_pdf_files">PDFs recentes salvos neste dispositivo:</string>
     <string name="libraries">Bibliotecas</string>
     <string name="libraries_open_source">Bibliotecas de código aberto</string>
     <string name="license">Licença</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">Имя файла</string>
     <string name="grant_permission">Предоставить разрешение</string>
     <string name="import_photos">Импорт</string>
-    <string name="last_saved_pdf_files">Последние PDF, сохранённые на этом устройстве:</string>
     <string name="libraries">Библиотеки</string>
     <string name="libraries_open_source">Библиотеки с открытым исходным кодом</string>
     <string name="license">Лицензия</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">Dosya adı</string>
     <string name="grant_permission">İzin ver</string>
     <string name="import_photos">İçe aktar</string>
-    <string name="last_saved_pdf_files">Bu cihaza kaydedilen son PDF\'ler:</string>
     <string name="libraries">Kütüphaneler</string>
     <string name="libraries_open_source">Açık kaynaklı kütüphaneler</string>
     <string name="license">Lisans</string>

app/src/main/res/values-zh-rTW/strings.xml

@@ -44,7 +44,6 @@
     <string name="filename">檔案名稱</string>
     <string name="grant_permission">授予權限</string>
     <string name="import_photos">匯入</string>
-    <string name="last_saved_pdf_files">此裝置上最近儲存的 PDF：</string>
     <string name="libraries">函式庫</string>
     <string name="libraries_open_source">開放原始碼函式庫</string>
     <string name="license">許可證</string>

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

@@ -44,7 +44,6 @@
     <string name="filename">文件名字</string>
     <string name="grant_permission">授予权限</string>
     <string name="import_photos">导入</string>
-    <string name="last_saved_pdf_files">最近保存在此设备上的 PDF：</string>
     <string name="libraries">库</string>
     <string name="libraries_open_source">开源库</string>
     <string name="license">许可证</string>

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

@@ -48,7 +48,6 @@
     <string name="filename">Filename</string>
     <string name="grant_permission">Grant permission</string>
     <string name="import_photos">Import</string>
-    <string name="last_saved_pdf_files">Recent PDFs saved on this device:</string>
     <string name="libraries">Libraries</string>
     <string name="libraries_open_source">Open-source libraries</string>
     <string name="license">License</string>

app/src/test/java/org/fairscan/app/ui/NavigationTest.kt

@@ -15,11 +15,9 @@
 package org.fairscan.app.ui
 
 import org.assertj.core.api.Assertions.assertThat
-import org.fairscan.app.LaunchMode
 import org.fairscan.app.ui.Screen.Main.Camera
 import org.fairscan.app.ui.Screen.Main.Document
 import org.fairscan.app.ui.Screen.Main.Export
-import org.fairscan.app.ui.Screen.Main.Home
 import org.fairscan.app.ui.Screen.Overlay.About
 import org.fairscan.app.ui.Screen.Overlay.Libraries
 import org.junit.Test
@@ -28,36 +26,33 @@ class NavigationTest {
 
     @Test
     fun empty_ScreenStack() {
-        val empty = NavigationState.initial(LaunchMode.NORMAL)
+        val empty = NavigationState.initial()
-        assertThat(empty.current).isEqualTo(Home)
+        assertThat(empty.current).isEqualTo(Camera)
         assertThat(empty.navigateBack()).isEqualTo(empty)
     }
 
     @Test
     fun navigate_between_fixed_screens() {
-        val atHome = NavigationState.initial(LaunchMode.NORMAL)
+        val atCamera = NavigationState.initial()
-        val atCamera = atHome.navigateTo(Camera)
+        val atDocument = atCamera.navigateTo(Document())
-        val atDocument = atHome.navigateTo(Document())
+        val atExport = atCamera.navigateTo(Export)
-        val atExport = atHome.navigateTo(Export)
 
-        assertThat(atHome.current).isEqualTo(Home)
         assertThat(atCamera.current).isEqualTo(Camera)
         assertThat(atDocument.current).isEqualTo(Document())
         assertThat(atExport.current).isEqualTo(Export)
 
         assertThat(atCamera.navigateTo(Document())).isEqualTo(atDocument)
-        assertThat(atDocument.navigateTo(Home)).isEqualTo(atHome)
+        assertThat(atDocument.navigateTo(Export)).isEqualTo(atExport)
         assertThat(atDocument.navigateTo(Camera)).isEqualTo(atCamera)
 
-        assertThat(atHome.navigateBack()).isEqualTo(atHome)
+        assertThat(atCamera.navigateBack()).isEqualTo(atCamera)
-        assertThat(atCamera.navigateBack()).isEqualTo(atHome)
         assertThat(atDocument.navigateBack()).isEqualTo(atCamera)
         assertThat(atExport.navigateBack()).isEqualTo(atCamera)
     }
 
     @Test
     fun navigate_to_secondary_screens() {
-        val atHome = NavigationState.initial(LaunchMode.NORMAL)
+        val atHome = NavigationState.initial()
         val atCamera = atHome.navigateTo(Camera)
 
         val atAboutAfterHome = atHome.navigateTo(About)
@@ -75,7 +70,7 @@ class NavigationTest {
 
     @Test
     fun external_call() {
-        val initial = NavigationState.initial(LaunchMode.EXTERNAL_SCAN_TO_PDF)
+        val initial = NavigationState.initial()
         assertThat(initial.current).isEqualTo(Camera)
         assertThat(initial.navigateBack().current).isEqualTo(Camera)
     }

gradle/libs.versions.toml

@@ -19,8 +19,6 @@ assertj = "3.27.7"
 pdfbox = "2.0.27.0"
 zoomable = "2.11.1"
 aboutLibraries = "13.2.1"
-protobuf = "0.9.6"
-protobufJavaLite = "4.34.1"
 kotlinSerialization = "1.10.0"
 reorderable = "3.0.0"
 jetbrainsKotlinJvm = "2.3.10"
@@ -49,10 +47,8 @@ androidx-camera-core = { group = "androidx.camera", name = "camera-core", versio
 androidx-camera-camera2 = { group = "androidx.camera", name = "camera-camera2", version.ref = "camerax" }
 androidx-camera-lifecycle = { group = "androidx.camera", name = "camera-lifecycle", version.ref = "camerax" }
 androidx-camera-view = { group = "androidx.camera", name = "camera-view", version.ref = "camerax" }
-androidx-datastore = { group = "androidx.datastore", name = "datastore" , version.ref = "datastore" }
 androidx-datastore-preferences = { group = "androidx.datastore", name = "datastore-preferences" , version.ref = "datastore" }
 androidx-documentfile = { group = "androidx.documentfile", name = "documentfile" , version.ref = "documentfile" }
-protobuf-javalite = { group = "com.google.protobuf", name="protobuf-javalite", version.ref = "protobufJavaLite"}
 litert = { group = "com.google.ai.edge.litert", name = "litert", version.ref = "litert" }
 litert-support = { group = "com.google.ai.edge.litert", name = "litert-support", version.ref = "litert" }
 litert-metadata = { group = "com.google.ai.edge.litert", name = "litert-metadata", version.ref = "litert" }
@@ -75,5 +71,4 @@ kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "ko
 kotlin-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 license =  { id = "com.github.hierynomus.license", version.ref = "license" }
 aboutLibrariesAndroid = { id = "com.mikepenz.aboutlibraries.plugin.android", version.ref = "aboutLibraries" }
-protobuf = { id = "com.google.protobuf", version.ref = "protobuf" }
 jetbrains-kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "jetbrainsKotlinJvm" }