package com.stoplight.blu.toys.ble.receiver;

@SuppressWarnings("all")
public class HexUtil {

	private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5',
			'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

	private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5',
			'6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

	public static char[] encodeHex(byte[] data) {
		return encodeHex(data, true);
	}

	public static char[] encodeHex(byte[] data, boolean toLowerCase) {
		return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
	}

	protected static char[] encodeHex(byte[] data, char[] toDigits) {
		if (data == null)
			return null;
		int l = data.length;
		char[] out = new char[l << 1];
		for (int i = 0, j = 0; i < l; i++) {
			out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
			out[j++] = toDigits[0x0F & data[i]];
		}
		return out;
	}

	public static String encodeHexStr(byte[] data) {
		return encodeHexStr(data, true);
	}

	public static String encodeHexStr(byte[] data, boolean toLowerCase) {
		return encodeHexStr(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
	}

	protected static String encodeHexStr(byte[] data, char[] toDigits) {
		return new String(encodeHex(data, toDigits));
	}

	public static String formatHexString(byte[] data) {
		return formatHexString(data, false);
	}

	public static String formatHexString(byte[] data, boolean addSpace) {
		if (data == null || data.length < 1)
			return null;
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < data.length; i++) {
			String hex = Integer.toHexString(data[i] & 0xFF);
			if (hex.length() == 1) {
				hex = '0' + hex;
			}
			sb.append(hex);
			if (addSpace)
				sb.append(" ");
		}
		return sb.toString().trim();
	}

	public static byte[] decodeHex(char[] data) {

		int len = data.length;

		if ((len & 0x01) != 0) {
			throw new RuntimeException("Odd number of characters.");
		}
		byte[] out = new byte[len >> 1];
		// two characters form the hex value.
		for (int i = 0, j = 0; j < len; i++) {
			int f = toDigit(data[j], j) << 4;
			j++;
			f = f | toDigit(data[j], j);
			j++;
			out[i] = (byte) (f & 0xFF);
		}
		return out;
	}

	protected static int toDigit(char ch, int index) {
		int digit = Character.digit(ch, 16);
		if (digit == -1) {
			throw new RuntimeException("Illegal hexadecimal character " + ch
					+ " at index " + index);
		}
		return digit;
	}

	public static byte[] hexStringToBytes(String hexString) {
		if (hexString == null || hexString.equals("")) {
			return null;
		}
		hexString = hexString.toUpperCase();
		int length = hexString.length() / 2;
		char[] hexChars = hexString.toCharArray();
		byte[] d = new byte[length];
		for (int i = 0; i < length; i++) {
			int pos = i * 2;
			d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
		}
		return d;
	}

	public static byte charToByte(char c) {
		return (byte) "0123456789ABCDEF".indexOf(c);
	}

	public static String extractData(byte[] data, int position) {
		return HexUtil.formatHexString(new byte[]{data[position]});
	}


	/**
	 * 转换阿斯克码表
	 *
	 * @param value
	 * @return
	 */
	public static String stringToAscii(String value) {
		StringBuffer sbu = new StringBuffer();
		char[] chars = value.toCharArray();
		for (int i = 0; i < chars.length; i++) {
			if (i != chars.length - 1) {
				sbu.append(Integer.toHexString(chars[i]));
			} else {
				sbu.append(Integer.toHexString(chars[i]));
			}
		}
		return sbu.toString();
	}


	/**
	 * 转换成16进制
	 */
	public static String bytes2hex02(byte[] bytes) {
		StringBuilder sb = new StringBuilder();
		String tmp = null;
		for (byte b : bytes) {
			// 将每个字节与0xFF进行与运算，然后转化为10进制，然后借助于Integer再转化为16进制
			tmp = Integer.toHexString(0xFF & b);
			if (tmp.length() == 1)// 每个字节8为，转为16进制标志，2个16进制位
				tmp = "0" + tmp;
			sb.append(tmp);
		}
		return sb.toString();
	}

	/**
	 * String 转换二进制
	 *
	 * @param str
	 * @return
	 */
	public static byte[] toBytes(String str) {
		if (str == null || str.trim().equals("")) {
			return new byte[0];
		}
		byte[] bytes = new byte[str.length() / 2];
		for (int i = 0; i < str.length() / 2; i++) {
			String subStr = str.substring(i * 2, i * 2 + 2);
			bytes[i] = (byte) Integer.parseInt(subStr, 16);
		}
		return bytes;
	}

}
