/*
 * Copyright (c) 2019-2020. Developed by Hedgecode.
 *
 * 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 org.hedgecode.chess.scanner.portal;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.hedgecode.chess.scanner.Scanner;
import org.hedgecode.chess.scanner.ScannerException;
import org.hedgecode.chess.scanner.StringUtils;
import org.hedgecode.chess.scanner.entity.PGNGame;
import org.hedgecode.chess.scanner.entity.PGNTournament;

/**
 * ChessGamesScanner
 *
 * @author Dmitry Samoshin aka gotty
 */
public class ChessGamesScanner extends AbstractSettingsScanner implements Scanner {

    private static final String SETTINGS_FILENAME = "chessgames.settings";

    @Override
    protected String getResourceName() {
        return SETTINGS_FILENAME;
    }

    @Override
    public PGNTournament scanTournament(String tournamentId) throws ScannerException {
        PGNTournament tournament = new PGNTournament(tournamentId);
        assignTournamentGames(tournament);
        return tournament;
    }

    @Override
    public PGNTournament findTournament(String tournamentName) throws ScannerException {
        PGNTournament tournament = null;
        Map<String, String> result = matchMap(
                assignUrl(
                        tournamentName, true
                ),
                getSettings().getTournamentQueryUrlRegex(),
                true
        );
        for (Map.Entry<String, String> entry : result.entrySet()) {
            if (entry.getValue().contains(tournamentName)) { // todo: contains?
                tournament = new PGNTournament(
                        entry.getKey(),
                        entry.getValue()
                );
            }
        }
        if (tournament != null) {
            assignTournamentGames(tournament);
        }
        return tournament;
    }

    @Override
    public PGNGame scanGame(String gameId) throws ScannerException {
        String pgn = request(
                assignUrl(gameId)
        );
        if (!StringUtils.isPgn(pgn)) {
            throw new ScannerException(
                    String.format("Failed to get PGN for requesting game ID: %s", gameId)
            );
        }
        return new PGNGame(
                gameId, pgn
        );
    }

    @Override
    public PGNGame scanGame(String gameId, String tournamentId) throws ScannerException {
        return scanGame(gameId);
    }

    @Override
    public PGNGame scanUrl(String gameUrl) throws ScannerException {
        String gamePage = request(gameUrl);
        String pgn = StringUtils.match(
                gamePage,
                getSettings().getGameUrlRegex()
        );
        if (pgn == null || !StringUtils.isPgn(pgn)) {
            throw new ScannerException(
                    String.format("Failed to get PGN for requesting URL: %s", gameUrl)
            );
        }
        return new PGNGame(
                null,
                pgn
        );
    }

    private void assignTournamentGames(PGNTournament tournament) throws ScannerException {
        tournament.clearGames();
        List<String> gamesId = new ArrayList<>();

        List<String> pageGamesId;
        int pageId = 0;
        do {
            pageGamesId = match(
                    assignUrl(
                            tournament.id(),
                            Integer.toString(++pageId)
                    ),
                    getSettings().getTournamentGamesUrlRegex(),
                    false
            );
            gamesId.addAll(
                    pageGamesId
            );
        } while (!pageGamesId.isEmpty());

        for (String gameId : gamesId) {
            tournament.addGame(
                    scanGame(gameId)
            );
        }
    }

}