Use the real name of the selected export folder rather than manipulating the URI

app/src/main/java/org/fairscan/app/ui/screens/settings/SettingsRepository.kt

@@ -15,9 +15,11 @@
 package org.fairscan.app.ui.screens.settings
 
 import android.content.Context
+import androidx.core.net.toUri
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.datastore.preferences.preferencesDataStore
+import androidx.documentfile.provider.DocumentFile
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
 import org.fairscan.app.domain.ExportQuality
@@ -35,6 +37,12 @@ class SettingsRepository(private val context: Context) {
             prefs[EXPORT_DIR_URI]
         }
 
+    val exportDirName: Flow<String?> = exportDirUri.map { uriString ->
+        uriString?.let {
+            DocumentFile.fromTreeUri(context, it.toUri())?.name
+        }
+    }
+
     val exportFormat: Flow<ExportFormat> =
         context.dataStore.data.map { prefs ->
             when (prefs[EXPORT_FORMAT]) {

app/src/main/java/org/fairscan/app/ui/screens/settings/SettingsScreen.kt

@@ -92,10 +92,7 @@ private fun SettingsContent(
     onExportQualityChanged: (ExportQuality) -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    val context = LocalContext.current
-    val folderName = remember(uiState.exportDirUri) {
-        extractFolderName(uiState.exportDirUri, context)
-    }
+    val folderName = uiState.exportDirName ?: stringResource(R.string.download_dirname)
 
     Column(
         modifier
@@ -111,7 +108,7 @@ private fun SettingsContent(
 
         Spacer(Modifier.height(12.dp))
 
-        if (uiState.exportDirUri != null) {
+        if (uiState.exportDirName != null) {
             OutlinedButton(
                 onClick = onResetExportDirClick,
                 border = BorderStroke(1.dp, MaterialTheme.colorScheme.primary),
@@ -197,14 +194,6 @@ fun DirectorySettingItem(
     }
 }
 
-private fun extractFolderName(uriString: String?, context: Context): String {
-    if (uriString == null) return context.getString(R.string.download_dirname)
-    return runCatching {
-        val uri = uriString.toUri()
-        uri.lastPathSegment?.substringAfter(':')?.substringAfter('/') ?: uriString
-    }.getOrElse { uriString }
-}
-
 @Preview
 @Composable
 fun SettingsScreenPreviewWithoutDir() {

app/src/main/java/org/fairscan/app/ui/screens/settings/SettingsViewModel.kt

@@ -16,13 +16,15 @@ package org.fairscan.app.ui.screens.settings
 
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.launch
 import org.fairscan.app.AppContainer
 import org.fairscan.app.domain.ExportQuality
 
 data class SettingsUiState(
-    val exportDirUri: String? = null,
+    val exportDirName: String? = null,
     val exportFormat: ExportFormat = ExportFormat.PDF,
     val exportQuality: ExportQuality = ExportQuality.BALANCED,
 )
@@ -32,12 +34,12 @@ class SettingsViewModel(container: AppContainer) : ViewModel() {
     private val repo = container.settingsRepository
 
     val uiState = combine(
-        repo.exportDirUri,
+        repo.exportDirName,
         repo.exportFormat,
         repo.exportQuality,
     ) { dir, format, quality ->
         SettingsUiState(
-            exportDirUri = dir,
+            exportDirName = dir,
             exportFormat = format,
             exportQuality = quality,
         )