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Abstract, incarnation independent implementations of the Alchemist's interfaces. Provides support for those who want to write incarnations.
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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.movestrategies.target;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import it.unibo.alchemist.model.Environment;
import it.unibo.alchemist.model.Molecule;
import it.unibo.alchemist.model.Node;
import it.unibo.alchemist.model.Position;
import it.unibo.alchemist.model.Reaction;
import it.unibo.alchemist.model.movestrategies.TargetSelectionStrategy;

import java.util.Iterator;
import java.util.Optional;
import java.util.regex.Matcher;

import static org.danilopianini.util.regex.Patterns.FLOAT_PATTERN;

/**
 * This strategy reads the value of a "target" molecule and tries to interpret
 * it as a coordinate.
 * 
 * @param 
 *            Concentration type
 */
public class FollowTarget> implements TargetSelectionStrategy {

    private static final long serialVersionUID = -446053307821810437L;
    private final Environment environment;
    private final Node node;
    private final Molecule track;

    /**
     * @param environment
     *            the environment
     * @param node
     *            the node
     * @param targetMolecule
     *            the target molecule
     */
    @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "This is intentional")
    public FollowTarget(final Environment environment, final Node node, final Molecule targetMolecule) {
        this.environment = environment;
        this.node = node;
        track = targetMolecule;
    }

    /**
     * @param x
     *            first coordinate extracted from the target concentration
     * @param y
     *            second coordinate extracted from the target concentration
     * @return a {@link Position} built using such parameters
     */
    protected P createPosition(final double x, final double y) {
        return environment.makePosition(x, y);
    }

    /**
     * @return the current position
     */
    protected final P getCurrentPosition() {
        return environment.getPosition(node);
    }

    @SuppressWarnings("unchecked")
    @SuppressFBWarnings("FL_FLOATS_AS_LOOP_COUNTERS") // false positive
    @Override
    public final P getTarget() {
        final Optional optt = Optional.ofNullable(node.getConcentration(track));
        if (optt.isPresent()) {
            final T conc = optt.get();
            if (conc instanceof Position) {
                return (P) conc;
            }
            double x = Double.NaN;
            double y = Double.NaN;
            if (conc instanceof Iterable) {
                final Iterator iterator = ((Iterable) conc).iterator();
                while (iterator.hasNext() && Double.isNaN(y)) {
                    final Object elem = iterator.next();
                    double val;
                    if (elem instanceof Number) {
                        val = ((Number) elem).doubleValue();
                    } else if (elem == null) {
                        return getCurrentPosition();
                    } else {
                        try {
                            val = Double.parseDouble(elem.toString());
                        } catch (NumberFormatException e) {
                            return getCurrentPosition();
                        }
                    }
                    if (Double.isNaN(x)) {
                        x = val;
                    } else {
                        y = val;
                    }
                }
            } else {
                final Matcher m = FLOAT_PATTERN
                    .matcher(conc instanceof CharSequence ? (CharSequence) conc : conc.toString());
                while (Double.isNaN(y) && m.find()) {
                    final String val = m.group();
                    /*
                     * It can not fail, unless the RegexUtil utility is broken
                     */
                    if (Double.isNaN(x)) {
                        x = Double.parseDouble(val);
                    } else {
                        y = Double.parseDouble(val);
                    }
                }
            }
            if (!Double.isNaN(y)) {
                return createPosition(x, y);
            }
        }
        return getCurrentPosition();
    }

    @Override
    public FollowTarget cloneIfNeeded(final Node destination, final Reaction reaction) {
        return new FollowTarget<>(environment, destination, track);
    }

    /**
     * @return the environment
     */
    protected Environment getEnvironment() {
        return environment;
    }

    /**
     * @return the molecule holding the destination information
     */
    public Molecule getTargetMolecule() {
        return track;
    }
}