/**
 * A class that maintains information on a book.
 * This might form part of a larger application such
 * as a library system, for instance.
 *
 * @author (Jonah Broyer)
 * @version (1/18/2020)
 */
class Book
{
    // The fields.
    private String author;
    private String title;
    private int pages;
    private String refNumber;
    private int borrowed;

    /**
     * Set the author and title fields when this object
     * is constructed.
     */
    public Book(String bookAuthor, String bookTitle, int bookPages)
    {
        author = bookAuthor;
        title = bookTitle;
        pages = bookPages;
        refNumber = "";
    }

    /**
     * Exercise 2.83
     * Return the author of the book.
     */
    public String getAuthor()
    {
        return author;
    }

    /**
     * Exercise 2.83
     * Return the title of the book.
     */
    public String getTitle()
    {
        return title;
    }

    /**
     * Exercise 2.84
     * Print the author's name.
     */
    public void printAuthor()
    {
        System.out.println("Author: " + author);
    }

    /**
     * Exercise 2.84
     * Print the title of the book.
     */
    public void printTitle()
    {
        System.out.println("Title: " + title);
    }

    /**
     * Exercise 2.85
     * Return the number of pages.
     */
    public int getPages()
    {
        return pages;
    }

    /**
     * Exercise 2.91
     * Print details about the book.
     */
    public void printDetails()
    {
        if(refNumber.length() > 0) {
            System.out.println("Title: " + title + ", Author: " + author +
                            ", Pages: " + pages + ", Reference Number: "
                            + refNumber + ", Amount of times this book" +
                            " has been borrowed: " + borrowed);
        }
        else {
           System.out.println("Title: " + title + ", Author: " + author +
                            ", Pages: " + pages + ", Reference Number: "
                            + "ZZZ" + ", Amount of times this book has" +
                            " been borrowed: " + borrowed);
        }
    }

    /**
     * Exercise 2.90
     * Set the books reference number.
     */
    public void setRefNumber(String ref)
    {
        if(ref.length() >= 3) {
            refNumber = ref;
        }
        else {
            System.out.println("Please enter a reference number that's " +
            "at least three characters.");
        }
    }

    /**
     * Exercise 2.87
     * Return the books reference number.
     */
    public String getRefNumber()
    {
        return refNumber;
    }

    /**
     * Exercise 2.91
     * Update the borrow field
     */
    public void borrow()
    {
        borrowed = borrowed + 1;
    }

    /**
     * Exercise 2.91
     * Return the value of how many times the book
     * has been borrowed
     */
    public int getBorrowed()
    {
        return borrowed;
    }
}