package class1_3_Interfaces;// Dr. Yoder. MSOE. 02 December 2016

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

/**
 * This class represents a home (paper hardcopy) library collection
 */
public class Library {
    private List<Book> books = new ArrayList<>();

    /**
     * Pull the book off of the shelf by the specific author.
     * @param author the full name of the person who wrote the book.
     * @return the requested book (or null if not found!
     *          ... wish there was a better way to handle this....)
     */
    public Book findByAuthor(String author) {
        int i = 0;
        Book found;
        while(i < books.size()
                && books.get(i).getAuthor().equals(author)) {
            i++;
        }
        if(i == books.size()) {
            found = null;
        } else {
            found = books.get(i);
        }
        return found;
    }

    /**
     * Add a set of books to the library.
     * Null references are skipped and not added to the library.
     * (Is there a better way to handle this?)
     * @param books the books to be added
     */
    public void addBooks(List<Book> books) {
        if(books != null) {
            for (Book book : books) {
                if (book != null) {
                    this.books.add(book);
                }
            }
        }
    }

    @Override
    public String toString() {
        String s = "Library:\n";
        for(Book book: books) {
            s +=" " + book + "\n";
        }
        return s;
    }

    //    public void addBooks(LinkedList<Book> books) {
//        if(books != null) {
//            for (Book book : books) {
//                if (book != null) {
//                    this.books.add(book);
//                }
//            }
//        }
//    }
}