/*******************************************************************************
 * 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.wiring;

import java.util.Arrays;
import java.util.List;

import com.cburch.logisim.circuit.RadixOption;
import com.cburch.logisim.comp.EndData;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.instance.StdAttr;

class PinAttributes extends ProbeAttributes {
	public static PinAttributes instance = new PinAttributes();

	private static final List<Attribute<?>> ATTRIBUTES = Arrays
			.asList(new Attribute<?>[] { StdAttr.FACING, Pin.ATTR_TYPE,
					StdAttr.WIDTH, Pin.ATTR_TRISTATE, Pin.ATTR_PULL,
					StdAttr.LABEL, Pin.ATTR_LABEL_LOC, StdAttr.LABEL_FONT,
					RadixOption.ATTRIBUTE });

	BitWidth width = BitWidth.ONE;
	boolean threeState = false;// true;
	int type = EndData.INPUT_ONLY;
	Object pull = Pin.PULL_NONE;

	public PinAttributes() {
	}

	@Override
	public List<Attribute<?>> getAttributes() {
		return ATTRIBUTES;
	}

	@Override
	@SuppressWarnings("unchecked")
	public <V> V getValue(Attribute<V> attr) {
		if (attr == StdAttr.WIDTH)
			return (V) width;
		if (attr == Pin.ATTR_TRISTATE)
			return (V) Boolean.valueOf(threeState);
		if (attr == Pin.ATTR_TYPE)
			return (V) Boolean.valueOf(type == EndData.OUTPUT_ONLY);
		if (attr == Pin.ATTR_PULL)
			return (V) pull;
		return super.getValue(attr);
	}

	boolean isInput() {
		return type != EndData.OUTPUT_ONLY;
	}

	boolean isOutput() {
		return type != EndData.INPUT_ONLY;
	}

	@Override
	public <V> void setValue(Attribute<V> attr, V value) {
		V oldvalue = null;
		if (attr == StdAttr.WIDTH) {
			BitWidth NewWidth = (BitWidth) value;
			if (width == NewWidth)
				return;
			width = (BitWidth) value;
		} else if (attr == Pin.ATTR_TRISTATE) {
			boolean NewThree = ((Boolean) value).booleanValue();
			if (threeState == NewThree)
				return;
			threeState = NewThree;
		} else if (attr == Pin.ATTR_TYPE) {
			int Newtype = ((Boolean) value).booleanValue() ? EndData.OUTPUT_ONLY
					: EndData.INPUT_ONLY;
			if (type == Newtype)
				return;
			type = Newtype;
		} else if (attr == Pin.ATTR_PULL) {
			Object newPull = value;
			if (pull.equals(newPull))
				return;
			pull = newPull;
		} else {
			oldvalue = (V) super.getValue(attr);
			super.setValue(attr, value);
			return;
		}
		fireAttributeValueChanged(attr, value, oldvalue);
	}
}