package misc;


import java.io.UnsupportedEncodingException;

public class Utils {
	
	public static int randomInt(int from, int to) {
		return (int) (from + Math.round(Math.random() * to));
	}
	
	public static String randomStringAN(int length) {
		String output = "";
		char[] table = new char[] { 
				'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 
				'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
				'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
		};
		for(int i = 0; i<length; i++)
			output += table[randomInt(0, table.length-1)];
		return output;
	}
	
	public static String randomStringUTF8(int length) {
		byte[] b = new byte[length];
		while(true) {
			for(int i = 0; i<length; i++)
				b[i] = (byte) Utils.randomInt(0, 255);
			try {
				return new String(b, "UTF-8");
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
		}
	}
	
	public static int byteArrayToInt(Byte[] b) 
	{
	    return   b[3] & 0xFF |
	            (b[2] & 0xFF) << 8 |
	            (b[1] & 0xFF) << 16 |
	            (b[0] & 0xFF) << 24;
	}

	public static Byte[] intToByteArray(int a)
	{
	    return new Byte[] {
	        (byte) ((a >> 24) & 0xFF),
	        (byte) ((a >> 16) & 0xFF),   
	        (byte) ((a >> 8) & 0xFF),   
	        (byte) (a & 0xFF)
	    };
	}
	
	public static int byteArrayToInt(byte[] b) 
	{
	    return   b[3] & 0xFF |
	            (b[2] & 0xFF) << 8 |
	            (b[1] & 0xFF) << 16 |
	            (b[0] & 0xFF) << 24;
	}

	public static byte[] intTobyteArray(int a)
	{
	    return new byte[] {
	        (byte) ((a >> 24) & 0xFF),
	        (byte) ((a >> 16) & 0xFF),   
	        (byte) ((a >> 8) & 0xFF),   
	        (byte) (a & 0xFF)
	    };
	}

}