package com.zy.asrs.utils;

/**
 * 权重优先级计算工具:
 * 按权重计算时间/距离/区域总优先级，并限制到 [-1, 1]
 */
public final class PriorityWeightCalculatorUtil {

    private PriorityWeightCalculatorUtil() {
    }

    public static double calculate(double timePriority,
                                   double distancePriority,
                                   double regionPriority,
                                   double timeWeight,
                                   double distanceWeight,
                                   double regionWeight) {
        double sum = Math.abs(timeWeight) + Math.abs(distanceWeight) + Math.abs(regionWeight);
        if (sum <= 0D) {
            timeWeight = 1D;
            distanceWeight = 1D;
            regionWeight = 1D;
            sum = 3D;
        }
        double t = timeWeight / sum;
        double d = distanceWeight / sum;
        double r = regionWeight / sum;
        double score = timePriority * t + distancePriority * d + regionPriority * r;
        return clamp(score, -1D, 1D);
    }

    private static double clamp(double value, double min, double max) {
        if (value < min) {
            return min;
        }
        if (value > max) {
            return max;
        }
        return value;
    }
}