/******************************************************************************
 * 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.peer;

import nxt.Nxt;
import nxt.util.Convert;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONStreamAware;

import java.util.List;

final class GetNextBlockIds extends PeerServlet.PeerRequestHandler {

    static final GetNextBlockIds instance = new GetNextBlockIds();

    private GetNextBlockIds() {}


    @Override
    JSONStreamAware processRequest(JSONObject request, Peer peer) {

        JSONObject response = new JSONObject();

        JSONArray nextBlockIds = new JSONArray();
        long blockId = Convert.parseUnsignedLong((String) request.get("blockId"));
        int limit = (int)Convert.parseLong(request.get("limit"));
        if (limit > 1440) {
            return GetNextBlocks.TOO_MANY_BLOCKS_REQUESTED;
        }
        List<Long> ids = Nxt.getBlockchain().getBlockIdsAfter(blockId, limit > 0 ? limit : 1440);
        ids.forEach(id -> nextBlockIds.add(Long.toUnsignedString(id)));
        response.put("nextBlockIds", nextBlockIds);

        return response;
    }

    @Override
    boolean rejectWhileDownloading() {
        return true;
    }

}