/*******************************************************************************
 * This file is part of logisim-evolution.
 *
 *   logisim-evolution is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   logisim-evolution 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with logisim-evolution.  If not, see <http://www.gnu.org/licenses/>.
 *
 *   Original code by Carl Burch (http://www.cburch.com), 2011.
 *   Subsequent modifications by :
 *     + Haute École Spécialisée Bernoise
 *       http://www.bfh.ch
 *     + Haute École du paysage, d'ingénierie et d'architecture de Genève
 *       http://hepia.hesge.ch/
 *     + Haute École d'Ingénierie et de Gestion du Canton de Vaud
 *       http://www.heig-vd.ch/
 *   The project is currently maintained by :
 *     + REDS Institute - HEIG-VD
 *       Yverdon-les-Bains, Switzerland
 *       http://reds.heig-vd.ch
 *******************************************************************************/

package com.cburch.logisim.std.memory;

import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.data.Value;
import com.cburch.logisim.instance.InstanceLogger;
import com.cburch.logisim.instance.InstanceState;
import com.cburch.logisim.instance.StdAttr;

public class ShiftRegisterLogger extends InstanceLogger {
	@Override
	public String getLogName(InstanceState state, Object option) {
		String inName = state.getAttributeValue(StdAttr.LABEL);
		if (inName == null || inName.equals("")) {
			inName = Strings.get("shiftRegisterComponent")
					+ state.getInstance().getLocation();
		}
		if (option instanceof Integer) {
			return inName + "[" + option + "]";
		} else {
			return inName;
		}
	}

	@Override
	public Object[] getLogOptions(InstanceState state) {
		Integer stages = state.getAttributeValue(ShiftRegister.ATTR_LENGTH);
		Object[] ret = new Object[stages.intValue()];
		for (int i = 0; i < ret.length; i++) {
			ret[i] = Integer.valueOf(i);
		}
		return ret;
	}

	@Override
	public Value getLogValue(InstanceState state, Object option) {
		BitWidth dataWidth = state.getAttributeValue(StdAttr.WIDTH);
		if (dataWidth == null)
			dataWidth = BitWidth.create(0);
		ShiftRegisterData data = (ShiftRegisterData) state.getData();
		if (data == null) {
			return Value.createKnown(dataWidth, 0);
		} else {
			int index = option == null ? 0 : ((Integer) option).intValue();
			return data.get(index);
		}
	}
}