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/*
 * Copyright (C) 2010-2023, Danilo Pianini and contributors
 * listed, for each module, in the respective subproject's build.gradle.kts file.
 *
 * This file is part of Alchemist, and is distributed under the terms of the
 * GNU General Public License, with a linking exception,
 * as described in the file LICENSE in the Alchemist distribution's top directory.
 */
package it.unibo.alchemist.model.deployments;

import it.unibo.alchemist.model.Environment;
import it.unibo.alchemist.model.Position;
import org.apache.commons.math3.random.RandomGenerator;

import javax.annotation.Nonnull;

import static org.apache.commons.math3.util.FastMath.PI;
import static org.apache.commons.math3.util.FastMath.cos;
import static org.apache.commons.math3.util.FastMath.sin;
import static org.apache.commons.math3.util.FastMath.sqrt;

/**
 * @param  {@link Position} type
 */
public final class Circle
> extends AbstractRandomDeployment {

    private final double centerX, centerY, radius;

    /**
     * @param pm
     *            the {@link Environment}
     * @param rand
     *            the {@link RandomGenerator}
     * @param nodes
     *            the number of nodes
     * @param centerX
     *            the center x of the circle
     * @param centerY
     *            the center y of the circle
     * @param radius
     *            the radius of the circle
     */
    public Circle(
        final Environment pm,
        final RandomGenerator rand,
        final int nodes,
        final double centerX,
        final double centerY,
        final double radius
    ) {
        super(pm, rand, nodes);
        this.centerX = centerX;
        this.centerY = centerY;
        this.radius = radius;
    }

    @Override
    @Nonnull
    protected P indexToPosition(final int i) {
        final double angle = randomDouble(0, 2 * PI);
        final double rad = radius * sqrt(randomDouble());
        return makePosition(centerX + rad * cos(angle), centerY + rad * sin(angle));
    }

}