/* 
 * Copyright (C) 2017 www.quorrabot.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 <http://www.gnu.org/licenses/>.
 */
package org.java_websocket.util;

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;

import org.java_websocket.exceptions.InvalidDataException;
import org.java_websocket.framing.CloseFrame;

public class Charsetfunctions {

    public static CodingErrorAction codingErrorAction = CodingErrorAction.REPORT;

    /*
	* @return UTF-8 encoding in bytes
     */
    public static byte[] utf8Bytes(String s) {
        try {
            return s.getBytes("UTF8");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

    /*
	* @return ASCII encoding in bytes
     */
    public static byte[] asciiBytes(String s) {
        try {
            return s.getBytes("ASCII");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

    public static String stringAscii(byte[] bytes) {
        return stringAscii(bytes, 0, bytes.length);
    }

    public static String stringAscii(byte[] bytes, int offset, int length) {
        try {
            return new String(bytes, offset, length, "ASCII");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

    public static String stringUtf8(byte[] bytes) throws InvalidDataException {
        return stringUtf8(ByteBuffer.wrap(bytes));
    }

    /*public static String stringUtf8( byte[] bytes, int off, int length ) throws InvalidDataException {
		CharsetDecoder decode = Charset.forName( "UTF8" ).newDecoder();
		decode.onMalformedInput( codingErrorAction );
		decode.onUnmappableCharacter( codingErrorAction );
		//decode.replaceWith( "X" );
		String s;
		try {
			s = decode.decode( ByteBuffer.wrap( bytes, off, length ) ).toString();
		} catch ( CharacterCodingException e ) {
			throw new InvalidDataException( CloseFrame.NO_UTF8, e );
		}
		return s;
	}*/
    public static String stringUtf8(ByteBuffer bytes) throws InvalidDataException {
        CharsetDecoder decode = Charset.forName("UTF8").newDecoder();
        decode.onMalformedInput(codingErrorAction);
        decode.onUnmappableCharacter(codingErrorAction);
        // decode.replaceWith( "X" );
        String s;
        try {
            bytes.mark();
            s = decode.decode(bytes).toString();
            bytes.reset();
        } catch (CharacterCodingException e) {
            throw new InvalidDataException(CloseFrame.NO_UTF8, e);
        }
        return s;
    }

    public static void main(String[] args) throws InvalidDataException {
        stringUtf8(utf8Bytes("\0"));
        stringAscii(asciiBytes("\0"));
    }

}