// Arup Guha
// 7/10/2015
// AddressBook Class - uses an array internally.

import java.util.Scanner;

public class AddressBook {

    private Contact[] friends; // An array of Contacts - each stores info for one friend
    private int numfriends; // Number of friends currently in AddressBook

    // Create an empty AddressBook
    public AddressBook() {
		friends = new Contact[10];
		numfriends = 0;
    }

    // Add a contact that's passed in as a parameter.
    public void addContact(Contact c) {
		friends[numfriends] = c;
		numfriends++;
    }

    // Print out info on all contacts using method Contact class.
    public void printContacts() {
		for (int i=0;i<numfriends;i++)
	    	System.out.println(friends[i]);
    }

    // Returns the number of friends currently in AddressBook
    public int numContacts() {
		return numfriends;
    }

    // Returns a non-neg integer if a Contact with name s exists corresponding
    // to which place in the array friends the Contact is stored. Returns -1
    // otherwise.
    private int haveContact(String s) {
		for (int i=0;i<numfriends;i++)
	    	if (friends[i].getName().equals(s))
				return i;
		return -1;
    }

    // Deletes a contact with name s, if one is in the AddressBook.
    public void deleteContact(String s) {
		int place = haveContact(s);
		if (place >= 0) {
	    	friends[place] = friends[numfriends-1];
	    	numfriends--;
		}
    }
}