//****************************************************************************************
//DVDCollection.java                        Author:WZW
//
//Represents a collection of DVD movies.
//****************************************************************************************

import  java.text.NumberFormat;
public class DVDCollection {
    private DVD[] collection;
    private int count;
    private double totalCost;

    //-------------------------------------------------------------------------------------
    //Constructor: Creates an initially empty collection.
    //-------------------------------------------------------------------------------------
    public DVDCollection() {
        collection = new DVD[100];
        count = 0;
        totalCost = 0.0;
    }

    //-------------------------------------------------------------------------------------
    //Adds a DVD to the collection, increasing the size of the
    //collection array if necessary.
    //------------------------------------------------------------------------------------
    public void addDVD(String title, String director, int year, double cost, boolean bluray) {
        if (count == collection.length)
            increasingSize();

        collection[count] = new DVD(title, director, year, cost, bluray);
        totalCost += cost;
        count++;
    }

    //---------------------------------------------------------------------------------------
    //Returns a report describing the DVD collection.
    //---------------------------------------------------------------------------------------
    public String toString() {
        NumberFormat fmt = NumberFormat.getCurrencyInstance();

        String report = "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
        report += "My DVD Collection\n\n";

        report += "Number of DVDs: " + count + "\n";
        report += "Total cost: " + fmt.format(totalCost) + "\n";
        report += "Average cost: " + fmt.format(totalCost / count);

        report += "\n\n DVD List:\n\n";

        for (int dvd = 0; dvd < count; dvd++)
            report += collection[dvd].toString() + "\n";

        return report;
    }

    //---------------------------------------------------------------------------------------
    //Increases the capacity of the collection by creating a
    //larger array and copying the existing collection into it.
    //---------------------------------------------------------------------------------------
    private void increasingSize()
    {
        DVD[] temp=new DVD[collection.length*2];

        for(int dvd=0;dvd<collection.length;dvd++)
            temp[dvd]=collection[dvd];

        collection=temp;
    }
}