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data class Volume(val id: String, val volumeInfo: VolumeInfo)

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data class VolumeInfo(
    val title: String,
    val authors: List<String>,
    val imageUrl: String?
)

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interface BooksRepository {

    suspend fun getRemoteBooks(author: String): Result<List<Volume>>

    suspend fun getBookmarks(): Flow<List<Volume>>

    suspend fun bookmark(book: Volume)

    suspend fun unbookmark(book: Volume)
}

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class GetBooksUseCase(private val booksRepository: BooksRepository) {
    suspend operator fun invoke(author: String) = booksRepository.getRemoteBooks(author)
}

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class BooksRepositoryImpl(
    private val localDataSource: BooksLocalDataSource,
    private val remoteDataSource: BooksRemoteDataSource
) : BooksRepository {

    override suspend fun getRemoteBooks(author: String): Result<List<Volume>> {
        return remoteDataSource.getBooks(author)
    }

    override suspend fun getBookmarks(): Flow<List<Volume>> {

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class BookEntityMapper {
    fun toBookEntity(volume: Volume): BookEntity {
        return BookEntity(
            id = volume.id,
            title = volume.volumeInfo.title,
            authors = volume.volumeInfo.authors,
            imageUrl = volume.volumeInfo.imageUrl
        )
    }

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@Entity(tableName = "book")
data class BookEntity(
    @PrimaryKey
    val id: String,
    val title: String,
    val authors: List<String>,
    val imageUrl: String?
)

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class BooksViewModel(
    private val getBooksUseCase: GetBooksUseCase,
    private val getBookmarksUseCase: GetBookmarksUseCase,
    private val bookmarkBookUseCase: BookmarkBookUseCase,
    private val unbookmarkBookUseCase: UnbookmarkBookUseCase,
    private val mapper: BookWithStatusMapper
) : ViewModel() {

    private val _dataLoading = MutableLiveData(true)
    val dataLoading: LiveData<Boolean> = _dataLoading

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override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        booksAdapter = BookAdapter(requireContext(), object : BookAdapter.ActionClickListener {
            override fun bookmark(book: BookWithStatus) {
                booksViewModel.bookmark(book)
            }

            override fun unbookmark(book: BookWithStatus) {
                booksViewModel.unbookmark(book)
            }

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private fun printInvoiceSheet(invoice: Invoice) {
    printInvoiceHeader(invoice)
    val fullName = getFullName(invoice)
    binding.tvInvoicePreview.append(fullName)
    val address = getAddress(invoice)
    binding.tvInvoicePreview.append(address)
}

private fun getFullName(invoice: Invoice): String {
    val fullName =