/*
 * Catroid: An on-device visual programming system for Android devices
 * Copyright (C) 2010-2016 The Catrobat Team
 * (<http://developer.catrobat.org/credits>)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * An additional term exception under section 7 of the GNU Affero
 * General Public License, version 3, is available at
 * http://developer.catrobat.org/license_additional_term
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.catrobat.catroid.content.commands;

import org.catrobat.catroid.content.bricks.Brick.BrickField;
import org.catrobat.catroid.content.bricks.ConcurrentFormulaHashMap;
import org.catrobat.catroid.content.bricks.FormulaBrick;
import org.catrobat.catroid.formulaeditor.Formula;

public class ChangeFormulaCommand implements Command {

	private FormulaBrick formulaBrick;
	private ConcurrentFormulaHashMap previousFormulaMap;
	private ConcurrentFormulaHashMap newFormulaMap;

	public ChangeFormulaCommand(FormulaBrick formulaBrick, ConcurrentFormulaHashMap newFormulaMap) {
		this.formulaBrick = formulaBrick;
		this.newFormulaMap = newFormulaMap;

		previousFormulaMap = new ConcurrentFormulaHashMap();
		for (BrickField key : newFormulaMap.keySet()) {
			Formula formula = formulaBrick.getFormulaWithBrickField(key);
			previousFormulaMap.putIfAbsent(key, formula.clone());
		}
	}

	@Override
	public void execute() {
		if (newFormulaMap != null) {
			for (BrickField key : newFormulaMap.keySet()) {
				formulaBrick.setFormulaWithBrickField(key, newFormulaMap.get(key));
			}
		}
	}

	@Override
	public void undo() {
		if (previousFormulaMap != null) {
			for (BrickField key : previousFormulaMap.keySet()) {
				formulaBrick.setFormulaWithBrickField(key, previousFormulaMap.get(key));
			}
		}
	}
}