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Abstraction for group of pedestrians capable of influence each other emotionally.

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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.cognitive.steering

import it.unibo.alchemist.model.Node
import it.unibo.alchemist.model.cognitive.SteeringActionWithTarget
import it.unibo.alchemist.model.environments.Euclidean2DEnvironment

/**
 * [Weighted] strategy where the weight of each steering action is the inverse of the node's distance from the
 * action's target (the closer the target, the more important the action). [defaultWeight] is used for actions without
 * a target.
 *
 * @param environment
 *          the environment in which the node moves.
 * @param node
 *          the owner of the steering action this strategy belongs to.
 */
class DistanceWeighted(
    environment: Euclidean2DEnvironment,
    node: Node,
    /**
     * Default weight for steering actions without a defined target.
     */
    private val defaultWeight: Double = 1.0,
) : Weighted(
    environment,
    node,
    {
        if (this is SteeringActionWithTarget) {
            targetDistanceTo(node, environment).let { if (it > 0.0) 1 / it else it }
        } else {
            defaultWeight
        }
    },
)