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/*
 * Copyright (c) 2018-2019.‭‭‭‭‭‭‭‭‭‭‭‭[zuoqinggang] www.pingfangushi.com
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */


package cn.smallbun.scaffold.framework.common.toolkit;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Md5加密类
 * @author SanLi
 * Created by [email protected] / [email protected] on  2019/5/26
 */
public class Md5Util {

	/**
	 * 16位加密
	 *
	 * @param plainText plainText
	 * @return String
	 */
	public static String md516(String plainText) {
		return md516(plainText, StandardCharsets.UTF_8.name());
	}

	/**
	 * 16位加密
	 *
	 * @param plainText plainText
	 * @return String
	 */
	public static String md516(String plainText, String charSet) {
		String result = null;
		try {
			byte[] ptBytes = plainText.getBytes(charSet);
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(ptBytes);
			byte[] b = md.digest();
			int i;
			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0) {
					i += 256;
				}
				if (i < 16) {
					buf.append("0");
				}
				buf.append(Integer.toHexString(i));
			}
			// result = buf.toString(); //md5 32bit
			// result = buf.toString().substring(8, 24))); //md5 16bit
			result = buf.toString().substring(8, 24);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	/**
	 * 32位加密
	 *
	 * @param plainText plainText
	 * @return String
	 */
	public static String md532(String plainText) {
		return md532(plainText, StandardCharsets.UTF_8.name());
	}

	/**
	 * 32位加密
	 *
	 * @param plainText plainText
	 * @return String
	 */
	public static String md532(String plainText, String charSet) {
		String result = null;
		try {
			byte[] ptBytes = plainText.getBytes(charSet);
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(ptBytes);
			byte[] b = md.digest();
			int i;
			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0) {
					i += 256;
				}
				if (i < 16) {
					buf.append("0");
				}
				buf.append(Integer.toHexString(i));
			}
			// result = buf.toString(); //md5 32bit
			// result = buf.toString().substring(8, 24))); //md5 16bit
			result = buf.toString();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return result;
	}

	public static String getMD5Code(String strObj) {
		String resultString = null;
		try {
			resultString = new String(strObj.getBytes(StandardCharsets.ISO_8859_1));
			MessageDigest md = MessageDigest.getInstance("MD5");
			// md.digest() 该函数返回值为存放哈希值结果的byte数组
			resultString = StringUtil.byteToHexString(md.digest(strObj.getBytes()));
		} catch (NoSuchAlgorithmException ex) {
			ex.printStackTrace();
			return null;
		}
		return resultString;
	}

	public static String encode(String text) {

		try {
			MessageDigest digest = MessageDigest.getInstance("md5");
			byte[] result = digest.digest(text.getBytes(StandardCharsets.UTF_8));
			StringBuilder sb = new StringBuilder();
			for (byte b : result) {
				int number = b & 0xff;
				String hex = Integer.toHexString(number);
				if (hex.length() == 1) {
					sb.append("0").append(hex);
				} else {
					sb.append(hex);
				}
			}
			return sb.toString().toUpperCase();
		} catch (Exception e) {
			e.printStackTrace();
		}

		return "";
	}
}