/******************************************************************************
 * 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.Nxt;
import nxt.NxtException;
import nxt.Transaction;
import nxt.TransactionType;
import nxt.util.Filter;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONStreamAware;

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

public final class GetExpectedOrderCancellations extends APIServlet.APIRequestHandler {

    static final GetExpectedOrderCancellations instance = new GetExpectedOrderCancellations();

    private GetExpectedOrderCancellations() {
        super(new APITag[] {APITag.AE});
    }

    @Override
    JSONStreamAware processRequest(HttpServletRequest req) throws NxtException {
        Filter<Transaction> filter = transaction -> transaction.getType() == TransactionType.ColoredCoins.ASK_ORDER_CANCELLATION
                || transaction.getType() == TransactionType.ColoredCoins.BID_ORDER_CANCELLATION;

        List<? extends Transaction> transactions = Nxt.getBlockchain().getExpectedTransactions(filter);
        JSONArray cancellations = new JSONArray();
        transactions.forEach(transaction -> cancellations.add(JSONData.expectedOrderCancellation(transaction)));
        JSONObject response = new JSONObject();
        response.put("orderCancellations", cancellations);
        return response;
    }
}