/******************************************************************************
 * 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.                                                                      *
 *                                                                            *
 * Removal or modification of this copyright notice is prohibited.            *
 *                                                                            *
 ******************************************************************************/

package nxt.http;

import nxt.Account;
import nxt.Nxt;
import nxt.NxtException;
import nxt.PrunableMessage;
import nxt.crypto.Crypto;
import nxt.util.Convert;
import nxt.util.JSON;
import org.json.simple.JSONStreamAware;

import javax.servlet.http.HttpServletRequest;

import static nxt.http.JSONResponses.PRUNED_TRANSACTION;

public final class GetPrunableMessage extends APIServlet.APIRequestHandler {

    static final GetPrunableMessage instance = new GetPrunableMessage();

    private GetPrunableMessage() {
        super(new APITag[] {APITag.MESSAGES}, "transaction", "secretPhrase", "retrieve");
    }

    @Override
    JSONStreamAware processRequest(HttpServletRequest req) throws NxtException {
        long transactionId = ParameterParser.getUnsignedLong(req, "transaction", true);
        String secretPhrase = Convert.emptyToNull(req.getParameter("secretPhrase"));
        boolean retrieve = "true".equalsIgnoreCase(req.getParameter("retrieve"));
        long readerAccountId = secretPhrase == null ? 0 : Account.getId(Crypto.getPublicKey(secretPhrase));
        PrunableMessage prunableMessage = PrunableMessage.getPrunableMessage(transactionId);
        if (prunableMessage == null && retrieve) {
            if (Nxt.getBlockchainProcessor().restorePrunedTransaction(transactionId) == null) {
                return PRUNED_TRANSACTION;
            }
            prunableMessage = PrunableMessage.getPrunableMessage(transactionId);
        }
        if (prunableMessage != null) {
            return JSONData.prunableMessage(prunableMessage, readerAccountId, secretPhrase);
        }
        return JSON.emptyJSON;
    }

}