/*
 * Created by Angel Leon (@gubatron), Alden Torres (aldenml)
 * Copyright (c) 2011-2014,, FrostWire(R). All rights reserved.
 
 * 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 com.frostwire.search;

import java.io.ByteArrayInputStream;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Matcher;

import com.frostwire.search.torrent.TorrentCrawlableSearchResult;
import com.frostwire.search.torrent.TorrentCrawledSearchResult;
import com.frostwire.torrent.TOTorrent;
import com.frostwire.torrent.TOTorrentException;
import com.frostwire.torrent.TOTorrentFile;
import com.frostwire.torrent.TorrentUtils;

/**
 * 
 * @author gubatron
 * @author aldenml
 *
 */
public final class PerformersHelper {

    private PerformersHelper() {
    }

    public static List<? extends SearchResult> searchPageHelper(RegexSearchPerformer<?> performer, String page, int regexMaxResults) {
        List<SearchResult> result = new LinkedList<SearchResult>();

        Matcher matcher = performer.getPattern().matcher(new MaxIterCharSequence(page, 2 * page.length()));

        int max = regexMaxResults;

        int i = 0;

        while (matcher.find() && i < max && !performer.isStopped()) {
            SearchResult sr = performer.fromMatcher(new SearchMatcher(matcher));
            if (sr != null) {
                result.add(sr);
                i++;
            }
        }

        return result;
    }

    /**
     * This method is only public allow reuse inside the package search, consider it a private API
     */
    public static List<? extends SearchResult> crawlTorrent(SearchPerformer performer, TorrentCrawlableSearchResult sr, byte[] data) throws TOTorrentException {
        List<TorrentCrawledSearchResult> list = new LinkedList<TorrentCrawledSearchResult>();

        TOTorrent torrent = TorrentUtils.readFromBEncodedInputStream(new ByteArrayInputStream(data));

        if (torrent != null) {
            TOTorrentFile[] files = torrent.getFiles();

            for (int i = 0; !performer.isStopped() && i < files.length; i++) {
                TOTorrentFile file = files[i];
                list.add(new TorrentCrawledSearchResult(sr, file));
            }
        }

        return list;
    }
}