/******************************************************************************
 * Copyright © 2013-2016 The Nxt Core Developers.                             *
 *                                                                            *
 * See the AUTHORS.txt, DEVELOPER-AGREEMENT.txt and LICENSE.txt files at      *
 * the top-level directory of this distribution for the individual copyright  *
 * holder information and the developer policies on copyright and licensing.  *
 *                                                                            *
 * Unless otherwise agreed in a custom licensing agreement, no part of the    *
 * Nxt software, including this file, may be copied, modified, propagated,    *
 * or distributed except according to the terms contained in the LICENSE.txt  *
 * file.                                                                      *
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 * Removal or modification of this copyright notice is prohibited.            *
 *                                                                            *
 ******************************************************************************/

package nxt.http;

import nxt.Account;
import nxt.Attachment;
import nxt.NxtException;
import nxt.Shuffling;
import org.json.simple.JSONStreamAware;

import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;

public final class ShufflingVerify extends CreateTransaction {

    static final ShufflingVerify instance = new ShufflingVerify();

    private ShufflingVerify() {
        super(new APITag[] {APITag.SHUFFLING, APITag.CREATE_TRANSACTION}, "shuffling", "shufflingStateHash");
    }

    @Override
    JSONStreamAware processRequest(HttpServletRequest req) throws NxtException {
        Shuffling shuffling = ParameterParser.getShuffling(req);
        byte[] shufflingStateHash = ParameterParser.getBytes(req, "shufflingStateHash", true);
        if (!Arrays.equals(shufflingStateHash, shuffling.getStateHash())) {
            return JSONResponses.incorrect("shufflingStateHash", "Shuffling is in a different state now");
        }
        Attachment attachment = new Attachment.ShufflingVerification(shuffling.getId(), shufflingStateHash);

        Account account = ParameterParser.getSenderAccount(req);
        return createTransaction(req, account, attachment);
    }
}