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package be.unamur.transitionsystem.test;

/*
 * #%L
 * vibes-core
 * %%
 * Copyright (C) 2014 PReCISE, University of Namur
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */

import java.util.ArrayList;
import java.util.Iterator;

import be.unamur.transitionsystem.Action;
import be.unamur.transitionsystem.State;
import be.unamur.transitionsystem.Transition;
import be.unamur.transitionsystem.test.exception.TestCaseException;

public class ImmutableTestCase extends
		AbstractTestCase {

	private Couple last = null;

	public ImmutableTestCase() {
		super();
	}

	private ImmutableTestCase(Couple last) {
		super();
		this.last = last;
	}

	@Override
	public Iterator iterator() {
		ArrayList list = new ArrayList();
		Couple elem = this.last;
		while (elem != null) {
			list.add(0, elem.getAction());
			elem = elem.getPrevious();
		}
		return list.iterator();
	}

	@Override
	public ImmutableTestCase enqueue(Transition trans) throws TestCaseException {
		return new ImmutableTestCase(new Couple(this.last, trans.getAction()));
	}
	
	@Override
	public ImmutableTestCase enqueue(Action action) throws TestCaseException {
		return new ImmutableTestCase(new Couple(this.last, action));
	}

	@Override
	public ImmutableTestCase dequeue() {
		if (this.last != null) {
			return new ImmutableTestCase(this.last.getPrevious());
		} else {
			return new ImmutableTestCase();
		}
	}

	private class Couple {
		private Couple previous;
		private Action action;

		public Couple(Couple previous, Action action) {
			super();
			this.previous = previous;
			this.action = action;
		}

		public Couple getPrevious() {
			return previous;
		}

		public Action getAction() {
			return action;
		}
	}

	@Override
	public ImmutableTestCase copy() {
		return new ImmutableTestCase(new Couple(this.last.getPrevious(),
				this.last.getAction()));
	}

	@Override
	public int size() {
		int i = 0;
		Couple elem = this.last;
		while (elem != null) {
			i++;
			elem = elem.getPrevious();
		}
		return i;
	}

	@Override
	public boolean contains(Action act) {
		boolean found = false;
		Couple elem = this.last;
		while (elem != null && !found) {
			found = elem.equals(act);
			elem = elem.getPrevious();
		}
		return found;
	}

}