package examples;

import java.util.*;
import java.text.*;

/**
 * CS401 Example AbstractCD
 * 
 * 
 * 
 * @author PJ Dillon
 */
public abstract class AbstractCD implements Comparable<AbstractCD>
{
	public final static String [] music_genres = {"Popular", "Rock", "Jazz",
	  "Country", "R&B", "Classical", "Other"};
	
	private String title;
	private int genre;
	private Date releaseDate;
	private int length;  // in seconds
	protected String[] trackTitles;
	
	public AbstractCD(String title, int genre, String date, int length, 
			String[] titles)
	{
		this.title = title;
		this.genre = genre;
		this.length = length;
		
		trackTitles = new String[titles.length];
		for(int i = 0; i < titles.length; i++)
			trackTitles[i] = titles[i];
		
		DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT);
		try
		{
			releaseDate = df.parse(date);
		}
		catch(ParseException pe)
		{
			releaseDate = null;
		}
	}
	
	/**
	 * Inherited from Object
	 */
	public String toString()
	{
		StringBuffer S = new StringBuffer();
		S.append("CD:           " + title + "\n");
		S.append("Genre:        " + music_genres[genre] + "\n");

		if (releaseDate != null)
		{
			S.append("Release Date: " + releaseDate.toString() + "\n");
		}
		else
		{
			S.append("No release date \n");
		}

		
		int min = length / 60;
		int sec = length % 60;
		S.append("Number of tracks: " + trackTitles.length + "\n");
		S.append("Length:       " + min + " min. " + sec + " sec. \n");
		return S.toString();
	}
	
	/**
	 * Here we override the equals() method inherited from the Object class. 
	 * Recall that equals() must be reflexive, symmetric, and transitive.
	 */
	public boolean equals(Object o)
	{
		if(o == null) return false;
		if(o instanceof AbstractCD)
		{
			System.out.println("this: " + getClass() + " o: " + o.getClass());
			AbstractCD cd = (AbstractCD) o;
			return title.equals(cd.title);
		}
		return false;
	}
	
	/**
	 * Since equals() is overridden, it's good practice to also override 
	 * hashCode(). The equals() method only compares the CD titles; so that, in 
	 * order to maintain the contract that if equals() returns true, hashCode()
	 * returns the same hash value, we simply have to return the hash code of the 
	 * String title with the assumption that the String class implemented a 
	 * hashCode() method under the same contract.
	 */
	public int hashCode()
	{
		return title.hashCode();
	}
	
	public int compareTo(AbstractCD rhs)
	{
		return title.compareTo(rhs.title);
	}
}