package class10_1_FunctionalExample_Library_start;// Dr. Yoder. MSOE. 02 December 2016

import java.util.ArrayList;
import java.util.InputMismatchException;
import java.util.List;

/**
 * This class represents a home (paper hardcopy) library collection
 */
public class Library {
    private ArrayList<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....)
     * @throws InputMismatchException if book not found
     */
    public Book findByAuthor(String author) throws InputMismatchException {
        int i = 0;
        Book found;
        while(i < books.size()
                && !books.get(i).getAuthor().equals(author)) {
            i++;
        }
        if(i == books.size()) {
            throw new InputMismatchException("author did not match any book"); // TODO: better exception
        } else {
            found = books.get(i);
        }
        return found;
    }

    public Book findByTitle(String title) throws InputMismatchException {
        int i = 0;
        Book found;
        while(i < books.size()
                && !books.get(i).getTitle().equals(title)) {
            i++;
        }
        if(i == books.size()) {
            throw new InputMismatchException("author did not match any book"); // TODO: better exception
        } else {
            found = books.get(i);
        }
        return found;
    }

    public Book find(Matcher condition, String searchTerm) throws InputMismatchException {
        int i = 0;
        Book found;
        while(i < books.size()
                && !condition.match(books.get(i),searchTerm)) {
            i++;
        }
        if(i == books.size()) {
            throw new InputMismatchException("author did not match any book"); // TODO: better exception
        } 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.
     * (There must be a better way to handle nulls!)
     * @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);
                }
            }
        }
    }
}