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/*
 * Copyright (c) 2009-2010 David Grant
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jscep.transaction;

import org.jscep.util.HexUtil;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicLong;


/**
 * This class represents the SCEP transactionID attribute.
 * 
 * @author David Grant
 */
public final class TransactionId {
	private static final AtomicLong ID_SOURCE = new AtomicLong();
	private final byte[] id;
	
	public TransactionId(byte[] id) {
		this.id = copy(id);
	}
	
	private TransactionId(PublicKey pubKey, String digestAlgorithm) {
    	MessageDigest digest;
        try {
            digest = MessageDigest.getInstance(digestAlgorithm);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        id = HexUtil.toHex(digest.digest(pubKey.getEncoded()));
	}
	
	private TransactionId() {
		id = Long.toHexString(ID_SOURCE.getAndIncrement()).getBytes();
	}
	
	public byte[] getBytes() {
		return copy(id);
	}
	

	/**
	 * Creates a new Transaction Id
	 * 
	 * Each call to this method will return the same transaction ID for the same parameters.
	 *
     * @param pubKey public key
     * @param digestAlgorithm digest algorithm
	 * @return the new Transaction Id
	 */
	public static TransactionId createTransactionId(PublicKey pubKey, String digestAlgorithm) {
		return new TransactionId(pubKey, digestAlgorithm);
	}
	
	/**
	 * Creates a new Transaction Id
	 * 
	 * Each call to this method will return a different transaction ID.
	 * 
	 * @return the new Transaction Id
	 */
	public static TransactionId createTransactionId() {
		return new TransactionId();
	}
	
	@Override
	public String toString() {
		return new String(id);
	}

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        TransactionId that = (TransactionId) o;

        return Arrays.equals(id, that.id);

    }

    @Override
    public int hashCode() {
        return id != null ? Arrays.hashCode(id) : 0;
    }

        private static byte[] copy(byte[] source) {
        byte[] dest = new byte[source.length];
        System.arraycopy(source, 0, dest, 0, source.length);

        return dest;
    }
}