adding media fetching tests

domains/android/core/src/main/kotlin/app/dapk/st/core/ContentResolverExtensions.kt

@@ -0,0 +1,23 @@
+package app.dapk.st.core
+
+import android.content.ContentResolver
+import android.database.Cursor
+import android.net.Uri
+
+data class ContentResolverQuery(
+    val uri: Uri,
+    val projection: List<String>,
+    val selection: String,
+    val selectionArgs: List<String>,
+    val sortBy: String,
+)
+
+inline fun <T> ContentResolver.reduce(query: ContentResolverQuery, operation: (Cursor) -> T): List<T> {
+    val result = mutableListOf<T>()
+    this.query(query.uri, query.projection.toTypedArray(), query.selection, query.selectionArgs.toTypedArray(), query.sortBy).use { cursor ->
+        while (cursor != null && cursor.moveToNext()) {
+            result.add(operation(cursor))
+        }
+    }
+    return result
+}

domains/android/stub/src/testFixtures/kotlin/fake/FakeContentResolver.kt

@@ -13,4 +13,20 @@ class FakeContentResolver {
     fun givenFile(uri: Uri) = every { instance.openInputStream(uri) }.delegateReturn()
 
     fun givenUriResult(uri: Uri) = every { instance.query(uri, null, null, null, null) }.delegateReturn()
+
+    fun givenQueryResult(
+        uri: Uri,
+        projection: Array<String>?,
+        selection: String?,
+        selectionArgs: Array<String>?,
+        sortOrder: String?,
+    ) = every {
+        instance.query(
+            uri,
+            projection,
+            selection,
+            selectionArgs,
+            sortOrder
+        )
+    }.delegateReturn()
 }

domains/android/stub/src/testFixtures/kotlin/fake/FakeCursor.kt

@@ -24,4 +24,56 @@ class FakeCursor {
         every { instance.getColumnIndex(columnName) } returns columnId
         every { instance.getString(columnId) } returns content
     }
+
+}
+
+interface CreateCursorScope {
+    fun addRow(vararg item: Pair<String, Any?>)
+}
+
+fun createCursor(creator: CreateCursorScope.() -> Unit): Cursor {
+    val content = mutableListOf<Map<String, Any?>>()
+    val scope = object : CreateCursorScope {
+        override fun addRow(vararg item: Pair<String, Any?>) {
+            content.add(item.toMap())
+        }
+    }
+    creator(scope)
+    return StubCursor(content)
+}
+
+private class StubCursor(private val content: List<Map<String, Any?>>) : Cursor by mockk() {
+
+    private val columnNames = content.map { it.keys }.flatten().distinct()
+    private var currentRowIndex = -1
+
+    override fun getColumnIndexOrThrow(columnName: String): Int {
+        return getColumnIndex(columnName).takeIf { it != -1 } ?: throw IllegalArgumentException(columnName)
+    }
+
+    override fun getColumnIndex(columnName: String) = columnNames.indexOf(columnName)
+
+    override fun moveToNext() = (currentRowIndex + 1 < content.size).also {
+        currentRowIndex += 1
+    }
+
+    override fun moveToFirst() = content.isNotEmpty()
+
+    override fun getCount() = content.size
+
+    override fun getString(index: Int): String? = content[currentRowIndex][columnNames[index]] as? String
+
+    override fun getInt(index: Int): Int {
+        return content[currentRowIndex][columnNames[index]] as? Int ?: throw IllegalArgumentException("Int can't be null")
+    }
+
+    override fun getLong(index: Int): Long {
+        return content[currentRowIndex][columnNames[index]] as? Long ?: throw IllegalArgumentException("Long can't be null")
+    }
+
+    override fun getColumnCount() = columnNames.size
+
+    override fun close() {
+        // do nothing
+    }
 }

features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/FetchMediaUseCase.kt

@@ -1,15 +1,20 @@
 package app.dapk.st.messenger.gallery
 
 import android.content.ContentResolver
-import android.content.ContentUris
 import android.net.Uri
 import android.provider.MediaStore
+import app.dapk.st.core.ContentResolverQuery
 import app.dapk.st.core.CoroutineDispatchers
+import app.dapk.st.core.reduce
 import app.dapk.st.core.withIoContext
 
-class FetchMediaUseCase(private val contentResolver: ContentResolver, private val dispatchers: CoroutineDispatchers) {
+class FetchMediaUseCase(
+    private val contentResolver: ContentResolver,
+    private val uriAvoidance: UriAvoidance,
+    private val dispatchers: CoroutineDispatchers
+) {
 
-    private val projection = arrayOf(
+    private val projection = listOf(
         MediaStore.Images.Media._ID,
         MediaStore.Images.Media.MIME_TYPE,
         MediaStore.Images.Media.DATE_MODIFIED,
@@ -22,26 +27,26 @@ class FetchMediaUseCase(private val contentResolver: ContentResolver, private va
     private val selection = MediaStore.Images.Media.BUCKET_ID + " = ? AND " + isNotPending() + " AND " + MediaStore.Images.Media.MIME_TYPE + " NOT LIKE ?"
 
     suspend fun getMediaInBucket(bucketId: String): List<Media> {
-
         return dispatchers.withIoContext {
-            val media = mutableListOf<Media>()
+            val query = ContentResolverQuery(
-            val selectionArgs = arrayOf(bucketId, "%image/svg%")
+                uri = uriAvoidance.externalContentUri,
-            val sortBy = MediaStore.Images.Media.DATE_MODIFIED + " DESC"
+                projection = projection,
-            val contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
+                selection = selection,
-            contentResolver.query(contentUri, projection, selection, selectionArgs, sortBy).use { cursor ->
+                selectionArgs = listOf(bucketId, "%image/svg%"),
-                while (cursor != null && cursor.moveToNext()) {
+                sortBy = MediaStore.Images.Media.DATE_MODIFIED + " DESC",
-                    val rowId = cursor.getLong(cursor.getColumnIndexOrThrow(projection[0]))
+            )
-                    val uri = ContentUris.withAppendedId(contentUri, rowId)
+
-                    val mimetype = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.MIME_TYPE))
+            contentResolver.reduce(query) { cursor ->
-                    val date = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATE_MODIFIED))
+                val rowId = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID))
-                    val orientation = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.ORIENTATION))
+                val uri = uriAvoidance.uriAppender(query.uri, rowId)
-                    val width = cursor.getInt(cursor.getColumnIndexOrThrow(getWidthColumn(orientation)))
+                val mimetype = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.MIME_TYPE))
-                    val height = cursor.getInt(cursor.getColumnIndexOrThrow(getHeightColumn(orientation)))
+                val date = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATE_MODIFIED))
-                    val size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.SIZE))
+                val orientation = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.ORIENTATION))
-                    media.add(Media(rowId, uri, mimetype, width, height, size, date))
+                val width = cursor.getInt(cursor.getColumnIndexOrThrow(getWidthColumn(orientation)))
-                }
+                val height = cursor.getInt(cursor.getColumnIndexOrThrow(getHeightColumn(orientation)))
+                val size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.SIZE))
+                Media(rowId, uri, mimetype, width, height, size, date)
             }
-            media
         }
     }
 
@@ -50,6 +55,10 @@ class FetchMediaUseCase(private val contentResolver: ContentResolver, private va
     private fun getHeightColumn(orientation: Int) =
         if (orientation == 0 || orientation == 180) MediaStore.Images.Media.HEIGHT else MediaStore.Images.Media.WIDTH
 
+    class UriAvoidance(
+        val uriAppender: (Uri, Long) -> Uri,
+        val externalContentUri: Uri,
+    )
 }
 
 data class Media(

features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/ImageGalleryModule.kt

@@ -1,7 +1,13 @@
 package app.dapk.st.messenger.gallery
 
 import android.content.ContentResolver
-import app.dapk.st.core.*
+import android.content.ContentUris
+import android.provider.MediaStore
+import app.dapk.st.core.CoroutineDispatchers
+import app.dapk.st.core.JobBag
+import app.dapk.st.core.ProvidableModule
+import app.dapk.st.core.createStateViewModel
+import app.dapk.st.messenger.gallery.FetchMediaUseCase.UriAvoidance
 import app.dapk.st.messenger.gallery.state.ImageGalleryState
 import app.dapk.st.messenger.gallery.state.imageGalleryReducer
 
@@ -14,7 +20,14 @@ class ImageGalleryModule(
         imageGalleryReducer(
             roomName = roomName,
             FetchMediaFoldersUseCase(contentResolver, dispatchers),
-            FetchMediaUseCase(contentResolver, dispatchers),
+            FetchMediaUseCase(
+                contentResolver,
+                UriAvoidance(
+                    uriAppender = { uri, rowId -> ContentUris.withAppendedId(uri, rowId) },
+                    externalContentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
+                ),
+                dispatchers,
+            ),
             JobBag(),
         )
     }

features/messenger/src/test/kotlin/app/dapk/st/messenger/gallery/FetchMediaUseCaseTest.kt

@@ -0,0 +1,107 @@
+package app.dapk.st.messenger.gallery
+
+import android.provider.MediaStore
+import fake.FakeContentResolver
+import fake.FakeUri
+import fake.createCursor
+import fixture.CoroutineDispatchersFixture.aCoroutineDispatchers
+import kotlinx.coroutines.test.runTest
+import org.amshove.kluent.shouldBeEqualTo
+import org.junit.Test
+
+private val A_EXTERNAL_CONTENT_URI = FakeUri()
+private const val A_BUCKET_ID = "a-bucket-id"
+private const val A_ROW_ID = 20L
+private const val A_MIME_TYPE = "image/png"
+private const val A_DATE_MODIFIED = 5000L
+private const val A_SIZE = 1000L
+private const val A_NORMAL_ORIENTATION = 0
+private const val AN_INVERTED_ORIENTATION = 90
+private const val A_WIDTH = 250
+private const val A_HEIGHT = 750
+
+class FetchMediaUseCaseTest {
+
+    private val fakeContentResolver = FakeContentResolver()
+    private val appendedUri = FakeUri()
+    private val uriAvoidance = FetchMediaUseCase.UriAvoidance(
+        uriAppender = { _, _ -> appendedUri.instance },
+        externalContentUri = A_EXTERNAL_CONTENT_URI.instance,
+    )
+
+    private val useCase = FetchMediaUseCase(fakeContentResolver.instance, uriAvoidance, aCoroutineDispatchers())
+
+    @Test
+    fun `given cursor content, when get media for bucket, then reads media`() = runTest {
+        fakeContentResolver.givenMediaQuery().returns(createCursor {
+            addRow(
+                MediaStore.Images.Media._ID to A_ROW_ID,
+                MediaStore.Images.Media.MIME_TYPE to A_MIME_TYPE,
+                MediaStore.Images.Media.DATE_MODIFIED to A_DATE_MODIFIED,
+                MediaStore.Images.Media.ORIENTATION to A_NORMAL_ORIENTATION,
+                MediaStore.Images.Media.WIDTH to A_WIDTH,
+                MediaStore.Images.Media.HEIGHT to A_HEIGHT,
+                MediaStore.Images.Media.SIZE to A_SIZE,
+            )
+        })
+
+        val result = useCase.getMediaInBucket(A_BUCKET_ID)
+
+        result shouldBeEqualTo listOf(
+            Media(
+                id = A_ROW_ID,
+                uri = appendedUri.instance,
+                mimeType = A_MIME_TYPE,
+                width = A_WIDTH,
+                height = A_HEIGHT,
+                size = A_SIZE,
+                dateModifiedEpochMillis = A_DATE_MODIFIED
+            )
+        )
+    }
+
+    @Test
+    fun `given cursor content with 90 degree orientation, when get media for bucket, then reads media with inverted width and height`() = runTest {
+        fakeContentResolver.givenMediaQuery().returns(createCursor {
+            addRow(
+                MediaStore.Images.Media._ID to A_ROW_ID,
+                MediaStore.Images.Media.MIME_TYPE to A_MIME_TYPE,
+                MediaStore.Images.Media.DATE_MODIFIED to A_DATE_MODIFIED,
+                MediaStore.Images.Media.ORIENTATION to AN_INVERTED_ORIENTATION,
+                MediaStore.Images.Media.WIDTH to A_WIDTH,
+                MediaStore.Images.Media.HEIGHT to A_HEIGHT,
+                MediaStore.Images.Media.SIZE to A_SIZE,
+            )
+        })
+
+        val result = useCase.getMediaInBucket(A_BUCKET_ID)
+
+        result shouldBeEqualTo listOf(
+            Media(
+                id = A_ROW_ID,
+                uri = appendedUri.instance,
+                mimeType = A_MIME_TYPE,
+                width = A_HEIGHT,
+                height = A_WIDTH,
+                size = A_SIZE,
+                dateModifiedEpochMillis = A_DATE_MODIFIED
+            )
+        )
+    }
+}
+
+private fun FakeContentResolver.givenMediaQuery() = this.givenQueryResult(
+    A_EXTERNAL_CONTENT_URI.instance,
+    arrayOf(
+        MediaStore.Images.Media._ID,
+        MediaStore.Images.Media.MIME_TYPE,
+        MediaStore.Images.Media.DATE_MODIFIED,
+        MediaStore.Images.Media.ORIENTATION,
+        MediaStore.Images.Media.WIDTH,
+        MediaStore.Images.Media.HEIGHT,
+        MediaStore.Images.Media.SIZE
+    ),
+    MediaStore.Images.Media.BUCKET_ID + " = ? AND " + isNotPending() + " AND " + MediaStore.Images.Media.MIME_TYPE + " NOT LIKE ?",
+    arrayOf(A_BUCKET_ID, "%image/svg%"),
+    MediaStore.Images.Media.DATE_MODIFIED + " DESC",
+)