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package com.cifaz.tools.util;

import java.math.BigDecimal;
import java.math.RoundingMode;

public class DoubleUtil {
    private static final int DEF_DIV_SCALE = 10;

    public DoubleUtil() {
    }

    public static double add(double v1, double v2) {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.add(b2).doubleValue();
    }

    public static double sub(double v1, double v2) {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.subtract(b2).doubleValue();
    }

    public static double mul(double v1, double v2) {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.multiply(b2).doubleValue();
    }

    public static double div(double v1, double v2) {
        return div(v1, v2, 10);
    }

    public static double div(double v1, double v2, int scale) {
        if (scale < 0) {
            throw new IllegalArgumentException("The scale must be a positive integer or zero");
        } else {
            BigDecimal b1 = new BigDecimal(Double.toString(v1));
            BigDecimal b2 = new BigDecimal(Double.toString(v2));
            return b1.divide(b2, scale, 4).doubleValue();
        }
    }

    public static double round(double v, int scale) {
        if (scale < 0) {
            throw new IllegalArgumentException("The scale must be a positive integer or zero");
        } else {
            BigDecimal b = new BigDecimal(Double.toString(v));
            BigDecimal one = new BigDecimal("1");
            return b.divide(one, scale, 4).doubleValue();
        }
    }

    public static double round(double v, int scale, RoundingMode round) {
        if (scale < 0) {
            throw new IllegalArgumentException("The scale must be a positive integer or zero");
        } else {
            BigDecimal b = new BigDecimal(Double.toString(v));
            BigDecimal one = new BigDecimal("1");
            return b.divide(one, scale, round).doubleValue();
        }
    }
}