package org.hedgewars.hedgeroid.netplay;

import java.util.Collections;

import java.util.Iterator;

import java.util.LinkedList;

import java.util.List;

public class PlayerList {

	private List<Player> list = new LinkedList<Player>();

	private List<Observer> observers = new LinkedList<Observer>();

	private long nextId = 1;

	public List<Player> getList() {

		return Collections.unmodifiableList(list);

	}

	public void observePlayerList(Observer plo) {

		observers.add(plo);

	}

	public void unobservePlayerList(Observer plo) {

		observers.remove(plo);

	}

	void addPlayer(String name) {

		Player p = new Player(name, nextId++);

		list.add(p);

		List<Player> unmodifiableList = Collections.unmodifiableList(list);

		for(Observer o : observers) {

			o.itemAdded(unmodifiableList, p);

		}

	}

	void removePlayer(String name) {

		for(Iterator<Player> iter = list.iterator(); iter.hasNext();) {

			Player p = iter.next();

			if(name.equals(p.name)) {

				iter.remove();

				List<Player> unmodifiableList = Collections.unmodifiableList(list);

				for(Observer o : observers) {

					o.itemDeleted(unmodifiableList, p);

				}

			}

		}

	}

	public static interface Observer {

		void itemAdded(List<Player> newList, Player added);

		void itemDeleted(List<Player> newList, Player deleted);

	}

}