import java.util.*; // required due to ArrayList use

public class MailManagerTwo {
	private ArrayList msgs = null;
	private int maxMsgs;
	
	public MailManagerTwo(int theMaxMsgs) {
		maxMsgs = theMaxMsgs;
		msgs = new ArrayList();
	}
	
	public MailManagerTwo(EmailMessage[] theMsgs)
	{
		// maxMsgs is twice the number of messages provided
		maxMsgs = 2 * theMsgs.length;
		msgs = new ArrayList();
		
		for (int i=0; i<theMsgs.length; i++) {
			msgs.add(theMsgs[i]); 
		}
	}
	
	public boolean full() {
		if (msgs.size() == maxMsgs)
			return true;
		else
			return false;
	}
	public boolean addMsg(EmailMessage theMsg) {
		if (!full()) {
			msgs.add(theMsg);
			return true;
		}
		return false;
	}
	

	public boolean removeMsg(int messageNumber) {
		messageNumber--;
		if (messageNumber < 0 || messageNumber >= msgs.size()) {
			return false;
		}
		else {
			msgs.remove(messageNumber); // requires index value
			return true;
		}
	}
	
	public String toString() {
		String result = "Email Messages: ";
		if (msgs.size() == 0) {
			return result + "None";
		}
		else {			
			result += "\n";
			for (int i=0; i<msgs.size(); i++) {
				result = result + (EmailMessage) msgs.get(i);
				if (i != msgs.size() - 1) {
					result += "\n";
				}
			}
			return result;
		}
	}
	
	public void clear() {
		msgs.clear();
	}
	
	public EmailMessage[] getMessages() {
		if (msgs.size() == 0) {
			return null;
		}
		else {
			EmailMessage[] result = new EmailMessage[msgs.size()];
			msgs.toArray(result);
			return result;
		}
	}
	
	public static void main(String[] args) {
		
		// First Manager
		MailManagerTwo mailManagerOne = new MailManagerTwo(4);
		mailManagerOne.addMsg(new EmailMessage("john@notReal.cmsc", "Hi Everybody"));
		mailManagerOne.addMsg(new EmailMessage("rose@faraway.cmsc", "I am hungry"));
		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
		MailManagerTwo mailManagerTwo = new MailManagerTwo(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);
		
		System.out.println("After removing second message");
		mailManagerTwo.removeMsg(2);  // removing second message
		System.out.println(mailManagerTwo);
	}
}