// Name : Matthew Reeves 
// This is a program to create a book entry for an unsorted list 

//creates the Book class
public class Book
{
	//creates instance variables for Book class
	private String Title;
	private String Author;
	private String Publisher;		
	private int PubYear;
	private String ISBN; 
	
	//constructor for individual parameters passed to class set attributes
	//for Book object
	public Book(String t, String a, String p, int py, String i)
	{
		setBook(t, a, p, py, i);
	}	

	//constructor for creating Book object when an existing Book 
	//object is passed in as the parameter
	public Book(Book abook)
	{		
		setBook(abook.Title, abook.Author, abook.Publisher, abook.PubYear, abook.ISBN);
	}

	//default constructor
	public Book()
	{
	}

	//actually assigns attributes to the book
	public boolean setBook(String t, String a, String p, int py, String i)
	{
		Title=t;
		Author=a;
		Publisher=p;
		PubYear=py;
		ISBN=i;
	
		//data validation for valid pubyear 	
		if (py<0)
		{
			PubYear=0;
			return false;
		}
		else
		{
			return true;
		}
	}

	//determines if two book objects have the same data values stored within them
	public boolean equals(Book abook)
	{
		if (Title.equals(abook.Title)) 
		{	
			if (Author.equals(abook.Author))
			{
				if (Publisher.equals(abook.Publisher))
				{
					if (PubYear==abook.PubYear)
					{
						if (ISBN.equals(abook.ISBN))
						{
							return true;
						}
					}
				}
			}
		}

		return false;
	}

	//returns formatted string with info on the book in question
	public String toString()
	{
		return String.format("Title:\t\t\t %s\nAuthor:\t\t\t %s\nPublisher:\t\t %s\nPublication Year:\t %d\nISBN:\t\t\t %s\n",Title, Author, Publisher, PubYear, ISBN);
	}
}