BookInfoScreen: Cover Reset feature.

app/src/main/java/ua/acclorite/book_story/data/parser/FileParserImpl.kt

@@ -16,6 +16,10 @@ class FileParserImpl @Inject constructor(
     private val fb2FileParser: Fb2FileParser
 ) : FileParser {
     override suspend fun parse(file: File): Pair<Book, CoverImage?>? {
+        if (!file.exists()) {
+            return null
+        }
+
         val fileFormat = ".${file.name.substringAfterLast(".")}".lowercase().trim()
 
         if (fileFormat == ".pdf") {

app/src/main/java/ua/acclorite/book_story/data/parser/TextParserImpl.kt

@@ -17,6 +17,12 @@ class TextParserImpl @Inject constructor(
     private val fb2TextParser: Fb2TextParser
 ) : TextParser {
     override suspend fun parse(file: File): Resource<List<String>> {
+        if (!file.exists()) {
+            return Resource.Error(
+                UIText.StringResource(R.string.error_something_went_wrong_with_file)
+            )
+        }
+
         val fileFormat = ".${file.name.substringAfterLast(".")}".lowercase().trim()
 
         if (fileFormat == ".pdf") {

app/src/main/java/ua/acclorite/book_story/data/repository/BookRepositoryImpl.kt

@@ -2,8 +2,10 @@ package ua.acclorite.book_story.data.repository
 
 import android.app.Application
 import android.graphics.Bitmap
+import android.graphics.BitmapFactory
 import android.net.Uri
 import android.os.Environment
+import android.provider.MediaStore
 import android.util.Log
 import androidx.datastore.preferences.core.Preferences
 import com.google.mlkit.common.model.DownloadConditions
@@ -46,6 +48,7 @@ import ua.acclorite.book_story.domain.util.LanguageCode
 import ua.acclorite.book_story.domain.util.Resource
 import ua.acclorite.book_story.domain.util.UIText
 import ua.acclorite.book_story.presentation.data.MainState
+import java.io.ByteArrayOutputStream
 import java.io.File
 import java.io.FileOutputStream
 import java.util.Locale
@@ -417,6 +420,46 @@ class BookRepositoryImpl @Inject constructor(
         )
     }
 
+    override suspend fun canResetCover(bookId: Int): Boolean {
+        val book = database.findBookById(bookId)
+
+        val defaultCoverUncompressed = fileParser.parse(File(book.filePath))?.second
+            ?: return false
+
+        if (book.image == null) {
+            return true
+        }
+
+        val stream = ByteArrayOutputStream()
+        defaultCoverUncompressed.copy(Bitmap.Config.RGB_565, false).compress(
+            Bitmap.CompressFormat.WEBP,
+            20,
+            stream
+        )
+        val byteArray = stream.toByteArray()
+        val defaultCover = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.size)
+
+        val currentCover = MediaStore.Images.Media.getBitmap(
+            application.contentResolver,
+            Uri.parse(book.image)
+        )
+
+        return !defaultCover.sameAs(currentCover)
+    }
+
+    override suspend fun resetCoverImage(bookId: Int): Boolean {
+        if (!canResetCover(bookId)) {
+            return false
+        }
+
+        val book = database.findBookById(bookId)
+        val defaultCover = fileParser.parse(File(book.filePath))?.second
+            ?: return false
+        updateCoverImageOfBook(bookMapper.toBook(book), defaultCover)
+
+        return true
+    }
+
     override suspend fun <T> retrieveDataFromDataStore(
         key: Preferences.Key<T>,
         defaultValue: T

app/src/main/java/ua/acclorite/book_story/domain/repository/BookRepository.kt

@@ -52,6 +52,12 @@ interface BookRepository {
         books: List<Book>
     )
 
+    suspend fun canResetCover(
+        bookId: Int
+    ): Boolean
+
+    suspend fun resetCoverImage(bookId: Int): Boolean
+
 
     suspend fun <T> retrieveDataFromDataStore(
         key: Preferences.Key<T>,

app/src/main/java/ua/acclorite/book_story/domain/use_case/CanResetCover.kt

@@ -0,0 +1,13 @@
+package ua.acclorite.book_story.domain.use_case
+
+import ua.acclorite.book_story.domain.repository.BookRepository
+import javax.inject.Inject
+
+class CanResetCover @Inject constructor(
+    private val repository: BookRepository
+) {
+
+    suspend fun execute(bookId: Int): Boolean {
+        return repository.canResetCover(bookId)
+    }
+}

app/src/main/java/ua/acclorite/book_story/domain/use_case/ResetCoverImage.kt

@@ -0,0 +1,13 @@
+package ua.acclorite.book_story.domain.use_case
+
+import ua.acclorite.book_story.domain.repository.BookRepository
+import javax.inject.Inject
+
+class ResetCoverImage @Inject constructor(
+    private val repository: BookRepository
+) {
+
+    suspend fun execute(bookId: Int): Boolean {
+        return repository.resetCoverImage(bookId)
+    }
+}

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/components/change_cover_bottom_sheet/BookInfoChangeCoverBottomSheet.kt

@@ -7,10 +7,13 @@ import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.HideImage
 import androidx.compose.material.icons.filled.ImageSearch
+import androidx.compose.material.icons.filled.Restore
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.State
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -62,12 +65,44 @@ fun BookInfoChangeCoverBottomSheet(
         }
     )
 
+    LaunchedEffect(Unit) {
+        onEvent(BookInfoEvent.OnCheckCoverReset)
+    }
+
     CustomBottomSheet(
         modifier = Modifier.fillMaxWidth(),
         onDismissRequest = {
             onEvent(BookInfoEvent.OnShowHideChangeCoverBottomSheet)
         }
     ) { padding ->
+        LazyColumn(Modifier.fillMaxWidth()) {
+            if (state.value.canResetCover) {
+                item {
+                    BookInfoChangeCoverBottomSheetItem(
+                        icon = Icons.Default.Restore,
+                        text = stringResource(id = R.string.reset_cover),
+                        description = stringResource(id = R.string.reset_cover_desc)
+                    ) {
+                        onEvent(
+                            BookInfoEvent.OnResetCoverImage(
+                                refreshList = {
+                                    onLibraryUpdateEvent(LibraryEvent.OnUpdateBook(it))
+                                    onHistoryUpdateEvent(HistoryEvent.OnUpdateBook(it))
+                                },
+                                showResult = {
+                                    Toast.makeText(
+                                        context,
+                                        it.asString(context),
+                                        Toast.LENGTH_LONG
+                                    ).show()
+                                }
+                            )
+                        )
+                    }
+                }
+            }
+
+            item {
                 BookInfoChangeCoverBottomSheetItem(
                     icon = Icons.Default.ImageSearch,
                     text = stringResource(id = R.string.change_cover),
@@ -77,8 +112,10 @@ fun BookInfoChangeCoverBottomSheet(
                         PickVisualMediaRequest(ActivityResultContracts.PickVisualMedia.ImageOnly)
                     )
                 }
+            }
 
             if (state.value.book.coverImage != null) {
+                item {
                     BookInfoChangeCoverBottomSheetItem(
                         icon = Icons.Default.HideImage,
                         text = stringResource(id = R.string.delete_cover),
@@ -99,11 +136,15 @@ fun BookInfoChangeCoverBottomSheet(
                         ).show()
                     }
                 }
+            }
 
+            item {
                 Spacer(
                     modifier = Modifier.height(
                         8.dp + padding
                     )
                 )
             }
+        }
+    }
 }

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/components/change_cover_bottom_sheet/BookInfoChangeCoverBottomSheetItem.kt

@@ -9,6 +9,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyItemScope
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
@@ -22,9 +23,15 @@ import androidx.compose.ui.unit.sp
 
 /**
  * Change cover bottom sheet item.
+ *
+ * @param icon Icon.
+ * @param text Text.
+ * @param description Description of the item.
+ * @param verticalPadding Vertical item padding.
+ * @param onClick OnClick callback.
  */
 @Composable
-fun BookInfoChangeCoverBottomSheetItem(
+fun LazyItemScope.BookInfoChangeCoverBottomSheetItem(
     icon: ImageVector,
     text: String,
     description: String,
@@ -33,6 +40,7 @@ fun BookInfoChangeCoverBottomSheetItem(
 ) {
     Row(
         modifier = Modifier
+            .animateItem()
             .fillMaxWidth()
             .clickable {
                 onClick()

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/data/BookInfoEvent.kt

@@ -8,6 +8,7 @@ import androidx.compose.ui.focus.FocusRequester
 import ua.acclorite.book_story.domain.model.Book
 import ua.acclorite.book_story.domain.model.Category
 import ua.acclorite.book_story.domain.util.OnNavigate
+import ua.acclorite.book_story.domain.util.UIText
 
 @Immutable
 sealed class BookInfoEvent {
@@ -17,6 +18,11 @@ sealed class BookInfoEvent {
     data class OnChangeCover(val uri: Uri, val context: Context, val refreshList: (Book) -> Unit) :
         BookInfoEvent()
 
+    data object OnCheckCoverReset : BookInfoEvent()
+    data class OnResetCoverImage(
+        val refreshList: (Book) -> Unit,
+        val showResult: (UIText) -> Unit
+    ) : BookInfoEvent()
     data object OnShowHideEditTitle : BookInfoEvent()
     data class OnRequestFocus(val focusRequester: FocusRequester) : BookInfoEvent()
     data class OnTitleValueChange(val value: String) : BookInfoEvent()

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/data/BookInfoState.kt

@@ -22,6 +22,8 @@ data class BookInfoState(
     val titleValue: String = "",
 
     val showChangeCoverBottomSheet: Boolean = false,
+    val canResetCover: Boolean = false,
+
     val showDetailsBottomSheet: Boolean = false,
 
     val showDeleteDialog: Boolean = false,

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/data/BookInfoViewModel.kt

@@ -21,15 +21,18 @@ import ua.acclorite.book_story.R
 import ua.acclorite.book_story.domain.model.Category
 import ua.acclorite.book_story.domain.model.History
 import ua.acclorite.book_story.domain.model.NullableBook
+import ua.acclorite.book_story.domain.use_case.CanResetCover
 import ua.acclorite.book_story.domain.use_case.DeleteBooks
 import ua.acclorite.book_story.domain.use_case.GetBookById
 import ua.acclorite.book_story.domain.use_case.GetBookFromFile
 import ua.acclorite.book_story.domain.use_case.GetText
 import ua.acclorite.book_story.domain.use_case.InsertHistory
+import ua.acclorite.book_story.domain.use_case.ResetCoverImage
 import ua.acclorite.book_story.domain.use_case.UpdateBookWithText
 import ua.acclorite.book_story.domain.use_case.UpdateBooks
 import ua.acclorite.book_story.domain.use_case.UpdateCoverImageOfBook
 import ua.acclorite.book_story.domain.util.OnNavigate
+import ua.acclorite.book_story.domain.util.UIText
 import ua.acclorite.book_story.presentation.data.Screen
 import java.io.File
 import java.util.Date
@@ -45,7 +48,9 @@ class BookInfoViewModel @Inject constructor(
     private val deleteBooks: DeleteBooks,
     private val getBookFromFile: GetBookFromFile,
     private val getBookById: GetBookById,
-    private val getText: GetText
+    private val getText: GetText,
+    private val canResetCover: CanResetCover,
+    private val resetCoverImage: ResetCoverImage,
 ) : ViewModel() {
 
     private val _state = MutableStateFlow(BookInfoState())
@@ -83,7 +88,8 @@ class BookInfoViewModel @Inject constructor(
                             book = it.book.copy(
                                 coverImage = newCoverImage
                             ),
-                            showChangeCoverBottomSheet = false
+                            showChangeCoverBottomSheet = false,
+                            canResetCover = canResetCover.execute(bookId = it.book.id)
                         )
                     }
                     event.refreshList(_state.value.book)
@@ -105,13 +111,52 @@ class BookInfoViewModel @Inject constructor(
                             book = it.book.copy(
                                 coverImage = null
                             ),
-                            showChangeCoverBottomSheet = false
+                            showChangeCoverBottomSheet = false,
+                            canResetCover = canResetCover.execute(bookId = it.book.id)
                         )
                     }
                     event.refreshList(_state.value.book)
                 }
             }
 
+            is BookInfoEvent.OnCheckCoverReset -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    _state.update {
+                        it.copy(
+                            canResetCover = canResetCover.execute(_state.value.book.id)
+                        )
+                    }
+                }
+            }
+
+            is BookInfoEvent.OnResetCoverImage -> {
+                viewModelScope.launch {
+                    val result = resetCoverImage.execute(_state.value.book.id)
+
+                    if (!result) {
+                        event.showResult(UIText.StringResource(R.string.error_could_not_reset_cover))
+                        return@launch
+                    }
+
+                    val book = getBookById.execute(_state.value.book.id)
+
+                    if (book == null) {
+                        event.showResult(UIText.StringResource(R.string.error_something_went_wrong))
+                        return@launch
+                    }
+
+                    _state.update {
+                        it.copy(
+                            book = book,
+                            showChangeCoverBottomSheet = false,
+                            canResetCover = false
+                        )
+                    }
+                    event.showResult(UIText.StringResource(R.string.cover_reset))
+                    event.refreshList(_state.value.book)
+                }
+            }
+
             is BookInfoEvent.OnShowHideEditTitle -> {
                 viewModelScope.launch(Dispatchers.IO) {
                     val shouldHide = _state.value.editTitle
@@ -662,7 +707,10 @@ class BookInfoViewModel @Inject constructor(
             }
 
             _state.update {
-                BookInfoState(book = book)
+                BookInfoState(
+                    book = book,
+                    canResetCover = canResetCover.execute(screen.bookId)
+                )
             }
         }
     }

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

@@ -123,6 +123,7 @@
     <string name="error_wrong_language">Не можна вибрати цю мову.</string>
     <string name="error_could_not_download_language">Не вдалося завантажити мову.</string>
     <string name="error_could_not_download_languages">Не вдалося завантажити мови.</string>
+    <string name="error_could_not_reset_cover">Не вдалося скинути обкладинку.</string>
 
     <!-- Is Empty messages -->
     <string name="browse_empty">
@@ -186,6 +187,8 @@
     <string name="read_more">Вам потрібно читати більше!</string>
     <string name="read_keep">Так тримати!</string>
     <string name="read_done">Браво, ви повністю прочитали цю книгу!</string>
+    <string name="reset_cover">Скинути обкладинку</string>
+    <string name="reset_cover_desc">Скиніть обкладинку книги до стандартної</string>
     <string name="change_cover">Змінити обкладинку</string>
     <string name="change_cover_desc">Виберіть нову обкладинку з ваших фото</string>
     <string name="delete_cover">Видалити обкладинку</string>
@@ -294,6 +297,7 @@
     <string name="translator_canceling">Переклад відміняється. Будь ласка, зачекайте.</string>
     <string name="translator_text_canceling">Перекладений текст відміняється. Будь ласка, зачекайте.</string>
     <string name="translator_starting">Переклад скоро почнеться. Будь ласка, зачекайте.</string>
+    <string name="cover_reset">Обкладинка була успішно скинута.</string>
 
     <!-- Snackbar messages -->
     <string name="history_element_deleted">Елемент історії був успішно видалений.</string>

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

@@ -142,6 +142,7 @@
     <string name="error_wrong_language">Cannot select this language.</string>
     <string name="error_could_not_download_language">Could not download language.</string>
     <string name="error_could_not_download_languages">Could not download languages.</string>
+    <string name="error_could_not_reset_cover">Could not reset cover image.</string>
 
     <!-- Is Empty messages -->
     <string name="browse_empty">
@@ -204,6 +205,8 @@
     <string name="read_more">You need to read more!</string>
     <string name="read_keep">Keep it up!</string>
     <string name="read_done">Well done, you have read the whole book!</string>
+    <string name="reset_cover">Reset cover image</string>
+    <string name="reset_cover_desc">Reset cover image of the book to the default</string>
     <string name="change_cover">Change cover image</string>
     <string name="change_cover_desc">Choose new cover from your photos</string>
     <string name="delete_cover">Delete cover image</string>
@@ -314,6 +317,7 @@
     <string name="translator_canceling">Translation is canceling. Please wait.</string>
     <string name="translator_text_canceling">Translated text is canceling. Please wait.</string>
     <string name="translator_starting">Translation will start soon. Please wait.</string>
+    <string name="cover_reset">Cover image was successfully reset.</string>
 
     <!-- Snackbar messages -->
     <string name="history_element_deleted">History element was successfully deleted.</string>