public class MailManager {
	private EmailMessage[] msgs = null;
	private int maxMsgs;
	private int numberOfMsgs;
	private int currentMsg;
	public static final int FIRST = 1;
	public static final int NEXT = 2;
	public static final int PREVIOUS = 3;
	
	public MailManager(int theMaxMsgs) {
		maxMsgs = theMaxMsgs;
		msgs = new EmailMessage[maxMsgs];
		numberOfMsgs = 0;
	}
	
	public MailManager(EmailMessage[] theMsgs)
	{
		// maxMsgs is twice the number of messages provided
		maxMsgs = 2 * theMsgs.length;
		msgs = new EmailMessage[maxMsgs];
		for (int i=0; i<theMsgs.length; i++) {
			msgs[i] = theMsgs[i];
		}
		numberOfMsgs = theMsgs.length;
	}
	
	public boolean full() {
		if (numberOfMsgs == maxMsgs) {
			return true;
		}
		return false;
	}
	public boolean addMsg(EmailMessage theMsg) {
		if (!full()) {
			msgs[numberOfMsgs++] = theMsg;
			return true;
		}
		return false;
	}
	
	public String toString() {
		String result = "Email Messages: ";
		if (numberOfMsgs == 0) {
			return result + "None";
		}
		else {			
			result += "\n";
			for (int i=0; i<numberOfMsgs; i++) {
				result = result + msgs[i];
				if (i != numberOfMsgs - 1) {
					result += "\n";
				}
			}
			return result;
		}
	}
	
	public void clear() {
		for (int i=0; i<maxMsgs; i++) {
			msgs[i] = null;
		}
		numberOfMsgs = 0;
	}
	
	public EmailMessage[] getMessages() {
		if (numberOfMsgs == 0) {
			return null;
		}
		else {
			EmailMessage[] result = new EmailMessage[numberOfMsgs];
			for (int i=0; i<numberOfMsgs; i++) {
				result[i] = msgs[i];
			}
			return result;
		}
	}
	
	public static void main(String[] args) {
		
		// First Manager
		MailManager mailManagerOne = new MailManager(4);
		mailManagerOne.addMsg(new EmailMessage("john@notReal.cmsc", "Hi Everybody"));
		mailManagerOne.addMsg(new EmailMessage("rose@faraway.cmsc", "I submitted hw"));
		System.out.println(mailManagerOne);
		mailManagerOne.clear();
		System.out.println(mailManagerOne);
		
		// Second Manager
		System.out.println();
		System.out.println("**** Second Manager ****");
		EmailMessage[] messages = new EmailMessage[2];
		messages[0] = new EmailMessage("bobby@notReal.cmsc", "Trip was great");
		messages[1] = new EmailMessage("mary@faraway.cmsc", "The movie was bad");
		// Passing array to the contructor
		MailManager mailManagerTwo = new MailManager(messages);
		System.out.println(mailManagerTwo);
		
		// Add a message and retrieve array of messages
		mailManagerTwo.addMsg(new EmailMessage("pete@notReal.cmsc", "Have a nice weekend"));
		EmailMessage[] allMessages = mailManagerTwo.getMessages();
		System.out.println();
		System.out.println("Retrieved Messages:");
		for (int i=0; i<allMessages.length; i++) {
			System.out.println(allMessages[i]);
		}

		System.out.println();
		System.out.println("Let manager print messages:");
		System.out.println(mailManagerTwo);
	}
}