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package com.wichell.core.util;

/**
 * 字符串辅助类
 * 
 * @author Wichell
 * @since 2011-11-08
 */
public final class RMBUtil {
	private RMBUtil() {
	}

	private static String HanDigiStr[] = new String[] { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };

	private static String HanDiviStr[] = new String[] { "", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟", "万",
			"拾", "佰", "仟", "亿", "拾", "佰", "仟", "万", "拾", "佰", "仟" };

	/**
	 * 将货币转换为大写形式
	 * 
	 * @param val 传入的数据
	 * @return String 返回的人民币大写形式字符串
	 */
	public static final String numToRMBStr(double val) {
		String SignStr = "";
		String TailStr = "";
		long fraction, integer;
		int jiao, fen;
		if (val < 0) {
			val = -val;
			SignStr = "负";
		}
		if (val > 99999999999999.999 || val < -99999999999999.999) {
			return "数值位数过大!";
		}
		// 四舍五入到分
		long temp = Math.round(val * 100);
		integer = temp / 100;
		fraction = temp % 100;
		jiao = (int) fraction / 10;
		fen = (int) fraction % 10;
		if (jiao == 0 && fen == 0) {
			TailStr = "整";
		} else {
			TailStr = HanDigiStr[jiao];
			if (jiao != 0) {
				TailStr += "角";
			}
			// 零元后不写零几分
			if (integer == 0 && jiao == 0) {
				TailStr = "";
			}
			if (fen != 0) {
				TailStr += HanDigiStr[fen] + "分";
			}
		}
		// 下一行可用于非正规金融场合，0.03只显示“叁分”而不是“零元叁分”
		return SignStr + PositiveIntegerToHanStr(String.valueOf(integer)) + "元" + TailStr;
	}

	/**
	 * 将货币转换为大写形式(类内部调用)

	 * 输入字符串必须正整数，只允许前导空格(必须右对齐)，不宜有前导零
	 * 
	 * @param val
	 * @return String
	 */
	private static String PositiveIntegerToHanStr(String NumStr) {
		// 输入字符串必须正整数，只允许前导空格(必须右对齐)，不宜有前导零
		String RMBStr = "";
		boolean lastzero = false;
		boolean hasvalue = false; // 亿、万进位前有数值标记
		int len, n;
		len = NumStr.length();
		if (len > 15) {
			return "数值过大!";
		}
		for (int i = len - 1; i >= 0; i--) {
			if (NumStr.charAt(len - i - 1) == ' ') {
				continue;
			}
			n = NumStr.charAt(len - i - 1) - '0';
			if (n < 0 || n > 9) {
				return "输入含非数字字符!";
			}
			if (n != 0) {
				if (lastzero) {
					RMBStr += HanDigiStr[0]; // 若干零后若跟非零值，只显示一个零
				}
				// 除了亿万前的零不带到后面
				// 如十进位前有零也不发壹音用此行
				if (!(n == 1 && (i % 4) == 1 && i == len - 1)) { // 十进位处于第一位不发壹音
					RMBStr += HanDigiStr[n];
				}
				RMBStr += HanDiviStr[i]; // 非零值后加进位，个位为空
				hasvalue = true; // 置万进位前有值标记
			} else {
				if ((i % 8) == 0 || ((i % 8) == 4 && hasvalue)) // 亿万之间必须有非零值方显示万
					RMBStr += HanDiviStr[i]; // “亿”或“万”
			}
			if (i % 8 == 0) {
				hasvalue = false; // 万进位前有值标记逢亿复位
			}
			lastzero = (n == 0) && (i % 4 != 0);
		}
		if (RMBStr.length() == 0) {
			return HanDigiStr[0]; // 输入空字符或"0"，返回"零"
		}
		return RMBStr;
	}
}