public class DVDUI {
	private   DVDCollection   model;

	public DVDUI() { model = new DVDCollection(); }
	public DVDCollection getModel() { return model; }

	private void addDVD() {
		DVD    aDVD = new DVD();
		System.out.println("Enter DVD Title:  ");
		aDVD.setTitle(new java.util.Scanner(System.in).nextLine());
		int entered = -1;
		do {
			System.out.println("Enter DVD Year (e.g., 2001):");
			try {
				entered = new java.util.Scanner(System.in).nextInt();
			}
			catch (java.util.InputMismatchException e) {
				System.out.println("Invalid Year");
			}
		}
		while (entered == -1);
		aDVD.setYear(entered);
		entered = -1;
		do {
			System.out.println("Enter DVD Duration (minutes):");
			try {
				entered = new java.util.Scanner(System.in).nextInt();
			}
			catch (java.util.InputMismatchException e) {
				System.out.println("Invalid Duration");
			}
		}
		while (entered == -1);
		aDVD.setDuration(entered);
		model.add(aDVD);
	}

	private void deleteDVD() {
		System.out.println("Enter DVD Title:  ");
        String title = new java.util.Scanner(System.in).nextLine();
        boolean success = model.remove(title);
        if (success)
            System.out.println("\nDVD: " + title + " was deleted successfully\n");
        else
            System.out.println("\n*** Error: Could not find DVD: " + title + "\n");
	}
	
	private void listDVDs() {
		java.util.Collections.sort(model.getDvds());
		for (DVD aDVD: model.getDvds())
			System.out.println(aDVD);
	}
         
    public void showMainMenu() {
    	while(true) {
             System.out.println("1.  Add DVD");
             System.out.println("2.  Delete DVD");
             System.out.println("3.  List DVDs");
             System.out.println("4.  Exit");
             System.out.println("\nPlease make a selection");
             try {
             	int   selection = new java.util.Scanner(System.in).nextInt();
             	switch(selection) {
                 	case 1:   addDVD();    break;
                 	case 2:   deleteDVD(); break;
                 	case 3:   listDVDs();  break;
                 	case 4:   System.exit(0);
                 	default:  System.out.println("Invalid Selection");
             	}
             }
             catch(java.util.InputMismatchException e) {
             	System.out.println("Invalid Selection");
             }
             System.out.println("\n");
         }
    }

	public static void main (String[] args) {
		System.out.println("Welcome to the Dvd Collection User Interface");
		System.out.println("--------------------------------------------");
		
		new DVDUI().showMainMenu();
     }
  }