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/*
 * Copyright (c) 2016—2017 Andrei Tomashpolskiy and individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package bt.dht;

import bt.metainfo.TorrentId;
import bt.net.Peer;
import bt.peer.ScheduledPeerSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ExecutorService;
import java.util.function.Consumer;
import java.util.stream.Stream;

/**
 * @since 1.1
 */
public class DHTPeerSource extends ScheduledPeerSource {

    private static final Logger LOGGER = LoggerFactory.getLogger(DHTPeerSource.class);

    private static final int MAX_PEERS_PER_COLLECTION = 50;

    private final TorrentId torrentId;
    private final DHTService dhtService;

    DHTPeerSource(TorrentId torrentId, DHTService dhtService, ExecutorService executor) {
        super(executor);
        this.torrentId = torrentId;
        this.dhtService = dhtService;
    }

    @Override
    protected void collectPeers(Consumer peerConsumer) {
        Stream peerStream = dhtService.getPeers(torrentId).limit(MAX_PEERS_PER_COLLECTION);
        peerStream.forEach(peer -> {
            peerConsumer.accept(peer);
            if (LOGGER.isTraceEnabled()) {
                LOGGER.trace(String.format("Collected new peer (torrent ID: %s, peer: %s)", torrentId, peer));
            }
        });
        if (LOGGER.isTraceEnabled()) {
            LOGGER.info("Peer collection finished for torrent ID: " + torrentId);
        }
    }
}