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 *  Copyright (c) 2010-2020, Elon.su All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * Neither the name of the elon developer nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * Author: Elon.su, you can also mail [email protected]
 *--------------------------------------------------------------------------
*/
package com.github.dennisit.vplus.data.utils;

import java.math.BigDecimal;

/**
 * Created by Elon.su on 17/5/13.
 */
public class NumberUtils {

    /* 约束数值*/
    public static final int RESTRAIN_NUM_0 = 0;
    public static final int RESTRAIN_NUM_1 = 1;
    public static final int RESTRAIN_NUM_5 = 5;
    public static final int RESTRAIN_NUM_10 = 10;
    public static final int RESTRAIN_NUM_25 = 25;
    public static final int RESTRAIN_NUM_50 = 50;
    public static final int RESTRAIN_NUM_100 = 100;

    private static final int HUNDRED = 100;

    public static long valueOf(Long num){
        return valueOf(num, 0);
    }

    public static long valueOf(Long num, long defaultVal){
        if(null == num){
            return defaultVal;
        }
        return num.longValue();
    }

    public static int valueOf(Integer num){
        return valueOf(num, 0);
    }

    public static int valueOf(Integer num, int defaultVal){
        if(null == num){
            return defaultVal;
        }
        return num.intValue();
    }

    public static byte valueOf(Byte num){
        return valueOf(num, (byte) 0);
    }

    public static byte valueOf(Byte num, byte defaultVal){
        if(null == num){
            return defaultVal;
        }
        return num.byteValue();
    }

    public static String valueOf(String str){
        return valueOf(str, StringUtils.EMPTY);
    }

    public static double valueOf(Double num){
        return valueOf(num, 0);
    }

    public static double valueOf(Double num, double defaultVal){
        if(null == num){
            return defaultVal;
        }
        return num.doubleValue();
    }

    public static float valueOf(Float num, float defaultVal){
        if(null == num){
            return defaultVal;
        }
        return num.floatValue();
    }

    public static String valueOf(String str, String defaultVal){
        if(StringUtils.isBlank(str)){
            return defaultVal;
        }
        return StringUtils.trim(str);
    }

    /**
     * 闭区间约束数字
     * @param number 待约束的数值
     * @param min 最小值
     * @param max 最大值
     * @return 约束结果值
     */
    public static int restrainNum(int number, int min, int max){
        return (number <= min) ? min : (number >= max ? max : number);
    }

    public static double divide(double top, double bottom){
        return divide(top, bottom, 2);
    }


    public static double divide(double top, double bottom, int decimal){
        return new BigDecimal(top).divide(new BigDecimal(bottom), decimal, BigDecimal.ROUND_HALF_EVEN).doubleValue();
    }

    public static int percent2Int(double num){
        return new BigDecimal(num).multiply(new BigDecimal(String.valueOf(HUNDRED))).intValue();
    }

    public static double int2Percent(int num){
        return divide(num, HUNDRED);
    }


}