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/*
 * Java Genetic Algorithm Library (jenetics-8.1.0).
 * Copyright (c) 2007-2024 Franz Wilhelmstötter
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Author:
 *    Franz Wilhelmstötter ([email protected])
 */
package io.jenetics.ext.moea;

import static io.jenetics.internal.util.SerialIO.readIntArray;
import static io.jenetics.internal.util.SerialIO.writeIntArray;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serial;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Comparator;

/**
 * @author Franz Wilhelmstötter
 * @version 5.2
 * @since 5.2
 */
final class SimpleIntVec implements Vec, Serializable {

	@Serial
	private static final long serialVersionUID = 2L;

	private final int[] _data;

	SimpleIntVec(final int[] data) {
		Vecs.checkVecLength(data.length);
		_data = data;
	}

	@Override
	public int[] data() {
		return _data;
	}

	@Override
	public int length() {
		return _data.length;
	}

	@Override
	public ElementComparator comparator() {
		return SimpleIntVec::cmp;
	}

	private static int cmp(final int[] u, final int[] v, final int i) {
		return Integer.compare(u[i], v[i]);
	}

	@Override
	public ElementDistance distance() {
		return SimpleIntVec::dist;
	}

	private static double dist(final int[] u, final int[] v, final int i) {
		return u[i] - v[i];
	}

	@Override
	public Comparator dominance() {
		return Pareto::dominance;
	}

	@Override
	public int hashCode() {
		return Arrays.hashCode(_data);
	}

	@Override
	public boolean equals(final Object obj) {
		return obj == this ||
			obj instanceof SimpleIntVec other  &&
			Arrays.equals(other._data, _data);
	}

	@Override
	public String toString() {
		return Arrays.toString(_data);
	}


	/* *************************************************************************
	 *  Java object serialization
	 * ************************************************************************/

	@Serial
	private Object writeReplace() {
		return new SerialProxy(SerialProxy.SIMPLE_INT_VEC, this);
	}

	@Serial
	private void readObject(final ObjectInputStream stream)
		throws InvalidObjectException
	{
		throw new InvalidObjectException("Serialization proxy required.");
	}

	void write(final DataOutput out) throws IOException {
		writeIntArray(_data, out);
	}

	static SimpleIntVec read(final DataInput in) throws IOException {
		return new SimpleIntVec(readIntArray(in));
	}
}