/**
 * A clas that maintains information on a book.
 * This might form part of a larger application such
 * as a library system, for instance.
 *
 * @author Oskar T
 * @version 0.0.1
 */
public class Book
{
    // MY FIELDS, MY FIELDS, WHAT HAVE YE DONE WITH MY FIELDS?
    private int pages;
    private int borrowed;
    private String author;
    private String title;
    private String refNumber;

    /**
     * Set the author, title and pages fields when this object
     * is constructed. Also sets refNumber to "".
     */
    public Book(String author, String title, int pages) {
        this.author = author;
        this.title = title;
        this.pages = pages;

        this.refNumber = "";
    }

   //Methods


    /*
     * Set refNumber to some string (length >= 3).
     */
    public void setRefNumber(String ref) {

        if (ref.length() >= 3) {
            this.refNumber = ref;
        }
        else {
            System.out.println("ERROR: Minimum of 3 characters needed, no reference number set");
        }
    }

    /*
     * Returns the number of pages.
     */
    public int getPages() {
        return this.pages;
    }

    /*
     * Returns the reference string.
     */
    public String getRefNumber() {
        return this.refNumber;
    }

    /*
     * Returns number of times a book has been borrowed.
     */
    public int getBorrowed() {
        return this.borrowed;
    }


   /*
    * Adds one to the borrow variable, which keeps track of how many times a book has been borrowed.
    */
   public void borrow() {
       this.borrowed = this.borrowed + 1;
    }

    /*
     * Prints author to terminal.
     */
   public void printAuthor() {
        System.out.println(this.author);
    }

    /*
     * Prints title to terminal.
     */
    public void printTitle() {
        System.out.println(this.title);
    }

    /*
     * Prints details (author, title and pages) to terminal.
     * Also print refNumber, but only if it has been set. Else print "ZZZ".
     */
    public void printDetails() {
        String ref = "ZZZ";

        if (this.refNumber.length() > 0) {
            ref = this.refNumber;
        }

        // should have used string append...
        System.out.println("Title: " + this.title + ", " +
                           "Author: " + this.author + ", " +
                           "Pages: " + this.pages + ", " +
                           "Reference number: " + ref + ", " +
                           "Popularity count: " + this.borrowed);
    }
}