//
// Copyright (C) 2008 United States Government as represented by the
// Administrator of the National Aeronautics and Space Administration
// (NASA).  All Rights Reserved.
//
// This software is distributed under the NASA Open Source Agreement
// (NOSA), version 1.3.  The NOSA has been approved by the Open Source
// Initiative.  See the file NOSA-1.3-JPF at the top of the distribution
// directory tree for the complete NOSA document.
//
// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
//

package gov.nasa.jpf.vm;

import java.io.PrintStream;
import java.util.Arrays;

import cmu.conditional.ChoiceFactory;
import cmu.conditional.Conditional;
import cmu.conditional.One;
import de.fosd.typechef.featureexpr.FeatureExpr;
import gov.nasa.jpf.util.HashData;
import gov.nasa.jpf.util.IntVector;

/**
 * element values for byte[] objects
 */
public class ByteArrayFields extends ArrayFields {

	Conditional<Byte>[] values;
	private static final One<Byte> init = One.valueOf((byte) 0);

	@SuppressWarnings("unchecked")
	public ByteArrayFields(int length) {
		values = new Conditional[length];
		Arrays.fill(values, init);
	}

	public Conditional<Byte>[] asByteArray() {
		return values;
	}

	public Byte[] asByteArrayConcrete(FeatureExpr ctx) {
		Byte[] cvalues = new Byte[this.values.length];
		for (int i = 0; i < this.values.length; i++) {
			cvalues[i] = this.values[i].simplify(ctx).getValue();
		}
		return cvalues;
	}

	protected void printValue(PrintStream ps, int idx) {
		ps.print(values[idx]);
	}

	public Conditional<?> getValues() {
		return new One<>(values);
	}

	public Conditional<Integer> arrayLength() {
		return new One<>(values.length);
	}

	public int getHeapSize() {
		return values.length;
	}

	public boolean equals(Object o) {
		if (o instanceof ByteArrayFields) {
			ByteArrayFields other = (ByteArrayFields) o;

			Conditional<Byte>[] v = values;
			Conditional<Byte>[] vOther = other.values;
			if (v.length != vOther.length) {
				return false;
			}

			for (int i = 0; i < v.length; i++) {
				if (!v[i].equals(vOther[i])) {
					return false;
				}
			}

			return compareAttrs(other);

		} else {
			return false;
		}
	}

	public ByteArrayFields clone() {
		ByteArrayFields f = (ByteArrayFields) cloneFields();
		f.values = values.clone();
		return f;
	}

	@Override
	public void setByteValue(FeatureExpr ctx, int pos, Conditional<Byte> b) {
		if (Conditional.isTautology(ctx)) {
			values[pos] = b;
		} else {
			values[pos] = ChoiceFactory.create(ctx, b, values[pos]).simplify();
		}
	}

	@Override
	public Conditional<Byte> getByteValue(int pos) {
		return values[pos];
	}

	public void appendTo(IntVector v) {
		byte[] a = new byte[values.length];
		for (int i = 0; i < values.length; i++) {
			for (Byte val : values[i].toList()) {
				a[i] = val;
			}
		}
		v.appendPacked(a);
	}

	public void hash(HashData hd) {
		Conditional<Byte>[] v = values;
		for (int i = 0; i < v.length; i++) {
			for (Byte b : v[i].toList()) {
				hd.add(b);
			}
		}
	}

	@SuppressWarnings("unchecked")
	@Override
	public void fill(FeatureExpr ctx, int from, int to, Conditional<?> value) {
		if (Conditional.isTautology(ctx)) {
			Arrays.fill(values, from, to, value);
		} else {
			for (int i = from; i <= to; i++) {
				setByteValue(ctx, i, (Conditional<Byte>) value);
			}
		}
	}

}