package com.boying.util;

import java.util.Arrays;
import java.util.UUID;

public class StringUtil {

    /** 16进制中的字符集 */
    private static final String HEX_CHAR = "0123456789ABCDEF";

    /** 16进制中的字符集对应的字节数组 */
    private static final byte[] HEX_STRING_BYTE = HEX_CHAR.getBytes();

    public static boolean isNullOrEmpty(String str) {
        if (null == str || "".equalsIgnoreCase(str.trim())
                || "null".equals(str.trim())) {
            return true;
        }
        return false;
    }
    public static byte[] convertNum(String s){
        String[] split = s.split("-");
        byte[] bytes = new byte[split.length];
        for (int i = 0; i < split.length; i++) {
            String s1 = split[i];
            byte b = Byte.parseByte("0x"+s1);
            bytes[i]=b;
        }
        return bytes;
    }

    public static String toStr(String[] strs){
        String s = Arrays.toString(strs);
        String substring = s.substring(1, s.length() - 1);
        String s1 = substring.replaceAll(",", "");
        String s2 = s1.replaceAll(" ", "");
        return s2;
    }

    public static byte[] toBytes(String strs){
        String[] split = strs.split("-");
        byte[] bytes = new byte[split.length];
        for (int i = 0; i < split.length; i++) {
            String s = split[i];
            bytes[i] = (byte) Byte.parseByte(s);
        }
        return bytes;
    }

    public static byte[] hex2Byte(String hex) {
        System.out.println();
        String[] parts = hex.split("-");
        byte[] bytes = new byte[parts.length];
        for (int i = 0; i < parts.length; i++) {
            bytes[i] = (byte) (Integer.parseInt(parts[i],10));
            System.out.print(bytes[i]+ " ");
        }
        return bytes;
    }

    public static String getUUID() {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }

    /**
     * 将指定byte数组以16进制的形式打印到控制台
     *
     * @param hint String
     * @param b    byte[]
     * @return void
     */
    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() + " ");
        }
    }

    /**
     * @param b byte[]
     * @return String
     */
    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 += " 0x" + hex.toUpperCase();
        }
        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, 0×44, 0xEF,
     * 0xD9}
     *
     * @param src String
     * @return byte[]
     */
    public static byte[] HexString2Bytes(String src) {
        if (null == src || 0 == src.length()) {
            return null;
        }
       // String s1 = src.replaceAll("-", "");
        byte[] ret = new byte[src.length() / 2];
        byte[] tmp = src.getBytes();
        for (int i = 0; i < (tmp.length / 2); i++) {
            ret[i] = (byte)uniteBytes(tmp[i * 2], tmp[i * 2 + 1]);
        }
        return ret;
    }

    /**
     * 将两个ASCII字符合成一个字节； 如："EF"–> 0xEF
     *
     * @param src0 byte
     * @param src1 byte
     * @return byte
     */
    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;
    }

    /**
     * 10进制字节数组转换为16进制字节数组
     *
     * byte用二进制表示占用8位，16进制的每个字符需要用4位二进制位来表示，则可以把每个byte
     * 转换成两个相应的16进制字符，即把byte的高4位和低4位分别转换成相应的16进制字符，再取对应16进制字符的字节
     *
     * @param b 10进制字节数组
     * @return 16进制字节数组
     */
    public static byte[] byte2hex(byte[] b) {
        int length = b.length;
        byte[] b2 = new byte[length << 1];
        int pos;
        for(int i=0; i<length; i++) {
            pos = 2*i;
            b2[pos] = HEX_STRING_BYTE[(b[i] & 0xf0) >> 4];
            b2[pos+1] = HEX_STRING_BYTE[b[i] & 0x0f];
        }
        return b2;
    }

    /**
     * 16进制字节数组转换为10进制字节数组
     *
     * 两个16进制字节对应一个10进制字节，则将第一个16进制字节对应成16进制字符表中的位置(0~15)并向左移动4位，
     * 再与第二个16进制字节对应成16进制字符表中的位置(0~15)进行或运算，则得到对应的10进制字节
     * @param b 10进制字节数组
     * @return 16进制字节数组
     */
    public static byte[] hex2byte(byte[] b) {
        if(b.length%2 != 0) {
            throw new IllegalArgumentException("byte array length is not even!");
        }

        int length = b.length >> 1;
        byte[] b2 = new byte[length];
        int pos;
        for(int i=0; i<length; i++) {
            pos = i << 1;
            b2[i] = (byte) (HEX_CHAR.indexOf( b[pos] ) << 4 | HEX_CHAR.indexOf( b[pos+1] ) );
        }
        return b2;
    }

    /**
     * 将16进制字节数组转成10进制字符串
     * @param b 16进制字节数组
     * @return 10进制字符串
     */
    public static String hex2Str(byte[] b) {
        return new String(hex2byte(b));
    }

    /**
     * 将10进制字节数组转成16进制字符串
     * @param b 10进制字节数组
     * @return 16进制字符串
     */
    public static String byte2HexStr(byte[] b) {
        return Integer.toHexString(Integer.parseInt(new String(b)));
    }


    public static void main(String[] args) {

    }
}