package com.jsql.util.bruter;
   
   import com.jsql.util.StringUtil;
   
   import java.nio.charset.StandardCharsets;
   import java.security.MessageDigest;
   import java.security.NoSuchAlgorithmException;
   import java.util.zip.CRC32;
   import java.util.zip.Checksum;
  
  public class HashUtil {
      
      private HashUtil() {
          // Nothing
      }
      
      public static String toAdler32(String text) {
          byte[] bytes = text.getBytes(StandardCharsets.UTF_8);
          Checksum checksum = new java.util.zip.Adler32();
          checksum.update(bytes,0,bytes.length);
          
          return String.valueOf(checksum.getValue());
      }
      
      public static String toCrc16(String text) {
          return Crc16Helper.generateCRC16(text);
      }
      
      public static String toCrc64(String text) {
          return Crc64Helper.generateCRC64(text.getBytes(StandardCharsets.UTF_8));
      }
      
      public static String toMySql(String textInput) throws NoSuchAlgorithmException {
          var messageDigest = MessageDigest.getInstance(Coder.SHA1.label);
          
          var password = String.valueOf(textInput.toCharArray());
          
          byte[] passwordBytes = password.getBytes(StandardCharsets.UTF_8);
          messageDigest.update(passwordBytes, 0, passwordBytes.length);
          
          byte[] hashSHA1 = messageDigest.digest();
          var stringSHA1 = HashUtil.digestToHexString(hashSHA1);
          
          var passwordSHA1 = String.valueOf(StringUtil.hexstr(stringSHA1).toCharArray());
          byte[] passwordSHA1Bytes = passwordSHA1.getBytes(StandardCharsets.UTF_8);
          
          messageDigest.update(passwordSHA1Bytes, 0, passwordSHA1Bytes.length);
          byte[] hashSHA1SH1 = messageDigest.digest();
          return HashUtil.digestToHexString(hashSHA1SH1);
      }
  
      public static String toCrc32(String textInput) {
          byte[] bytes = textInput.getBytes(StandardCharsets.UTF_8);
          
          Checksum checksum = new CRC32();
          checksum.update(bytes, 0, bytes.length);
          
          long lngChecksum = checksum.getValue();
          return Long.toString(lngChecksum);
      }
  
      public static String toMd4(String textInput) {
          MessageDigest messageDigest = new DigestMD4();
  
          var passwordString = String.valueOf(textInput.toCharArray());
          byte[] passwordByte = passwordString.getBytes(StandardCharsets.UTF_8);
          
          messageDigest.update(passwordByte, 0, passwordByte.length);
          byte[] encodedPassword = messageDigest.digest();
          return HashUtil.digestToHexString(encodedPassword);
      }
  
      public static String toHash(String nameMethod, String textInput) throws NoSuchAlgorithmException {
          var messageDigest = MessageDigest.getInstance(nameMethod);
          
          var passwordString = String.valueOf(textInput.toCharArray());
          byte[] passwordByte = passwordString.getBytes(StandardCharsets.UTF_8);
          
          messageDigest.update(passwordByte, 0, passwordByte.length);
          byte[] encodedPassword = messageDigest.digest();
          return HashUtil.digestToHexString(encodedPassword);
      }
      
      /**
       * Convert a digest hash to a string representation.
       * @param block Digest array
       * @return Hash as a string
       */
      public static String digestToHexString(byte[] block) {
          var buf = new StringBuilder();
          for (byte b : block) {
              HashUtil.byte2hex(b, buf);
          }
          return buf.toString();
      }
      
      /**
       * Convert byte character to hexadecimal StringBuffer character.
       * @param b Byte character to convert
      * @param buf Hexadecimal converted character
      */
     private static void byte2hex(byte b, StringBuilder buf) {
         var hexChars = new char[]{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
         int high = (b & 0xf0) >> 4;
         int low = b & 0x0f;
         buf.append(hexChars[high]);
         buf.append(hexChars[low]);
     }
 }