package com.amarsoft.aims.util;

import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;

import com.amarsoft.are.lang.StringX;

/**
 * 十六进制辅助处理类
 * @author EX-YANGSONG001
 *
 */
public class HexHelper {
	
	/**
	 * unicode转字串
	 * @param str
	 * @return
	 */
	public static String unicode2String(String... str){
		StringBuffer sb = new StringBuffer();
		for(String s:str){
			if(StringX.isEmpty(s))continue;
			int a = Integer.parseInt(s,16);
			sb.append((char)a);
		}
		return sb.toString();
	}
	/**
	 * 转化字符串为十六进制编码
	 * @param s
	 * @return
	 */
	public static String toHexString(String s) {
		String str = "";
		for (int i = 0; i < s.length(); i++) {
			int ch = (int) s.charAt(i);
			String s4 = Integer.toHexString(ch);
			str = str + s4;
		}
		return str;
	}

	// 转化十六进制编码为字符串
	public static String toStringHex1(String s,String charset) throws UnsupportedEncodingException {
		byte[] baKeyword = new byte[s.length() / 2];
		for (int i = 0; i < baKeyword.length; i++) {
				baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(i * 2, i * 2 + 2), 16));
		}
		s = new String(baKeyword, charset);// UTF-16le:Not
		return s;
	}

	public static void main(String[] args) {
		String s = encode("[投资计划规模]*85%+[人行基准利率(5年以上)]*90%");
		System.out.println(s);
		System.out.println(decode("GB18030","5B62958D448BA1521289C46A215D2A3835252B5B4EBA884C57FA51C65229738728355E744EE54E0A295D2A393025"));
	}

	/*
	 * 16进制数字字符集
	 */
	private static String hexString = "0123456789ABCDEF";

	/**
	 * 将字符串编码成16进制数字,适用于所有字符（包括中文）
	 * @param str
	 * @return
	 */
	public static String encode(String str) {
		// 根据默认编码获取字节数组
		byte[] bytes = str.getBytes();
		StringBuilder sb = new StringBuilder(bytes.length * 2);
		// 将字节数组中每个字节拆解成2位16进制整数
		for (int i = 0; i < bytes.length; i++) {
			sb.append(hexString.charAt((bytes[i] & 0xf0) >> 4));
			sb.append(hexString.charAt((bytes[i] & 0x0f) >> 0));
		}
		return sb.toString();
	}


	/**
	 * 将16进制数字解码成字符串,适用于所有字符（包括中文）
	 * @param charset
	 * @param str
	 * @return
	 * @throws UnsupportedEncodingException 
	 */
	public static String decode(String charset,String[] str) throws UnsupportedEncodingException {
		StringBuffer sb = new StringBuffer();
		for(String s:str){
			ByteArrayOutputStream baos = new ByteArrayOutputStream(s.length() / 2);
			// 将每2位16进制整数组装成一个字节
			for (int i = 0; i < s.length(); i += 2){
				baos.write((hexString.indexOf(s.charAt(i)) << 4 | hexString.indexOf(s.charAt(i + 1))));
			}
			sb.append(new String(baos.toByteArray(),charset));
		}
		return sb.toString();
	}
	/**
	 * 将16进制数字解码成字符串,适用于所有字符（包括中文）
	 * @param bytes
	 * @return
	 */
	public static String decode(String... str) {
		StringBuffer sb = new StringBuffer();
		for(String s:str){
			ByteArrayOutputStream baos = new ByteArrayOutputStream(s.length() / 2);
			// 将每2位16进制整数组装成一个字节
			for (int i = 0; i < s.length(); i += 2){
				baos.write((hexString.indexOf(s.charAt(i)) << 4 | hexString.indexOf(s.charAt(i + 1))));
			}
			sb.append(new String(baos.toByteArray()));
		}
		return sb.toString();
	}

	/**
	 * 将指定byte数组以16进制的形式打印到控制台
	 * @param hint
	 * @param b
	 */
	public static void printHexString(String hint, byte[] b) {
		System.out.print(hint);
		for (int i = 0; i < b.length; i++) {
			String hex = Integer.toHexString(b[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			System.out.print(hex.toUpperCase() + " ");
		}
		System.out.println("");
	}

	/**
	 * 二进制转为16进制
	 * @param b
	 * @return
	 */
	public static String bytes2HexString(byte[] b) {
		String ret = "";
		for (int i = 0; i < b.length; i++) {
			String hex = Integer.toHexString(b[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			ret += hex.toUpperCase();
		}
		return ret;
	}

	/**
	 * 将两个ASCII字符合成一个字节； 如："EF"--> 0xEF
	 * @param src0
	 * @param src1
	 * @return
	 */
	public static byte uniteBytes(byte src0, byte src1) {
		byte _b0 = Byte.decode("0x" + new String(new byte[] { src0 })).byteValue();
		_b0 = (byte) (_b0 << 4);
		byte _b1 = Byte.decode("0x" + new String(new byte[] { src1 })).byteValue();
		byte ret = (byte) (_b0 ^ _b1);
		return ret;
	}

	/**
	 * 将指定字符串src，以每两个字符分割转换为16进制形式 如："2B44EFD9" --> byte[]{0x2B, 0x44, 0xEF,0xD9}
	 * @param src
	 * @return
	 */
	public static byte[] hexString2Bytes(String src) {
		byte[] ret = new byte[8];
		byte[] tmp = src.getBytes();
		for (int i = 0; i < 8; i++) {
			ret[i] = uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
		}
		return ret;
	}
}