PolyBooks/sdp_polyBooks

package com.github.polybooks.database

import android.content.Context
import com.github.polybooks.core.Book
import com.github.polybooks.core.BookRating
import com.github.polybooks.core.ISBN
import com.github.polybooks.core.Interest
import java.util.concurrent.CompletableFuture

/**
 * Database aggregates the functionality of Book/Sale/Interest Databases in one place
 * */
object Database {

    /**
     * The instance of a Book Database associated with this Database
     * */
    fun bookDatabase(context: Context): BookDatabase = CompleteBookDatabase(context)

    /**
     * The instance of a Sale Database associated with this Database
     * */
    fun saleDatabase(context: Context): SaleDatabase = FBSaleDatabase(bookDatabase(context))

    /**
     * The instance of a Interest Database associated with this Database
     * */
    val interestDatabase : InterestDatabase = DummyInterestDatabase

}

private class CompleteBookDatabase(context: Context): BookDatabase {

    val provider =
        CachedBookProvider(
            CachedBookProvider(OLBookDatabase, FBBookDatabase),
            LocalBookCache(context)
        )

    override fun searchByTitle(
        title: String,
        ordering: BookOrdering
    ): CompletableFuture<List<Book>> = FBBookDatabase.searchByTitle(title)

    override fun searchByInterests(
        interests: Collection<Interest>,
        ordering: BookOrdering
    ): CompletableFuture<List<Book>> = FBBookDatabase.searchByInterests(interests)

    override fun listAllBooks(ordering: BookOrdering): CompletableFuture<List<Book>> =
        FBBookDatabase.listAllBooks()

    override fun getRating(isbn: ISBN): CompletableFuture<BookRating> {
        return FBBookDatabase.getRating(isbn)
    }

    override fun setRating(isbn: ISBN, bookRating: BookRating): CompletableFuture<Unit> {
        return FBBookDatabase.setRating(isbn, bookRating)
    }

    override fun getBooks(
        isbns: Collection<ISBN>,
        ordering: BookOrdering
    ): CompletableFuture<List<Book>> = provider.getBooks(isbns)

    override fun addBook(book: Book): CompletableFuture<Unit> = provider.addBook(book)

}