package com.dsh.guns.modular.system.util;

import java.math.BigDecimal;

public class BigDecimalToChineseAmountUtil {
    private static final String[] CN_UPPER_NUMBER = {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};
    private static final String[] CN_UPPER_MONETRAY_UNIT = {"分", "角", "元", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟", "兆", "拾", "佰", "仟"};
    private static final String CN_FULL = "整";
    private static final String CN_NEGATIVE = "负";
    private static final int MONEY_PRECISION = 2;

    public static String convertToChineseAmount(BigDecimal number) {
        StringBuilder builder = new StringBuilder();

        if (number.compareTo(BigDecimal.ZERO) < 0) {
            builder.append(CN_NEGATIVE);
            number = number.abs();
        }

        long integralPart = number.longValue();
        BigDecimal decimalPart = number.subtract(BigDecimal.valueOf(integralPart)).multiply(BigDecimal.TEN.pow(MONEY_PRECISION));

        if (decimalPart.compareTo(BigDecimal.ZERO) == 0) {
            builder.append(CN_FULL);
        }

        long integralPartTemp = integralPart;
        int unit = 0;
        boolean isZero = true;
        boolean needZero = false;

        while (integralPartTemp > 0) {
            long tempNumber = integralPartTemp % 10;
            if (tempNumber > 0) {
                if (needZero) {
                    builder.insert(0, CN_UPPER_NUMBER[0]);
                }
                builder.insert(0, CN_UPPER_MONETRAY_UNIT[unit]);
                builder.insert(0, CN_UPPER_NUMBER[(int) tempNumber]);
                isZero = false;
                needZero = false;
            } else {
                if (!isZero) {
                    needZero = true;
                }
                if (unit == 2 || unit == 6 || unit == 10 || unit == 14) {
                    builder.insert(0, CN_UPPER_MONETRAY_UNIT[unit]);
                    isZero = true;
                }
            }
            integralPartTemp = integralPartTemp / 10;
            unit++;
        }

        if (decimalPart.compareTo(BigDecimal.ZERO) > 0) {
            builder.append(convertDecimalToChinese(decimalPart));
        }

        return builder.toString();
    }

    private static String convertDecimalToChinese(BigDecimal decimalPart) {
        StringBuilder builder = new StringBuilder();

        for (int i = 0; i < MONEY_PRECISION; i++) {
            int num = decimalPart.intValue() % 10;
            builder.insert(0, CN_UPPER_NUMBER[num]);
            builder.append(CN_UPPER_MONETRAY_UNIT[i + 2]);
            decimalPart = decimalPart.multiply(BigDecimal.TEN);
        }

        return builder.toString();
    }

}