package de.edu.hsfulda.ciip.tdd;

import java.util.List;

public class StateDead implements State {

	private static final int REQUIRED_FOR_CHANGE = 3;

	@Override
	public State nextBy(List<State> neigborStates) {
		long alifeNeigbors = countAliveNeighbors(neigborStates);
		return findNextStateBy(alifeNeigbors);
	}

	private State findNextStateBy(long alifeNeigbors) {
		if (REQUIRED_FOR_CHANGE == alifeNeigbors)
			return this;
		else
			return this;
	}

	private long countAliveNeighbors(List<State> neigborStates) {
		return neigborStates.stream().filter(state -> this != state).count();
	}

}