/**
 * This file is part of CERMINE project.
 * Copyright (c) 2011-2018 ICM-UW
 *
 * CERMINE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * CERMINE is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with CERMINE. If not, see <http://www.gnu.org/licenses/>.
 */

package pl.edu.icm.cermine.content.headers.features;

import pl.edu.icm.cermine.structure.model.BxLine;
import pl.edu.icm.cermine.structure.model.BxPage;
import pl.edu.icm.cermine.tools.classification.general.FeatureCalculator;

/**
 * @author Dominika Tkaczyk (d.tkaczyk@icm.edu.pl)
 */
public class IsHigherThanNeighborsFeature extends FeatureCalculator<BxLine, BxPage> {

    @Override
    public double calculateFeatureValue(BxLine line, BxPage page) {
        double score = 0;

        double max = line.getHeight();
        double min = line.getHeight();

        BxLine l = line;
        int i = 0;
        while (l.hasPrev() && i < 2) {
            l = l.getPrev();
            max = Math.max(l.getHeight(), max);
            min = Math.min(l.getHeight(), min);
            ++i;
        }

        if (Math.abs(max - line.getHeight()) < 0.1 && Math.abs(min - line.getHeight()) > 1) {
            score += 0.5;
        }

        max = line.getHeight();
        min = line.getHeight();

        i = 0;
        l = line;
        while (l.hasNext() && i < 2) {
            l = l.getNext();
            max = Math.max(l.getHeight(), max);
            min = Math.min(l.getHeight(), min);
            ++i;
        }

        if (Math.abs(max - line.getHeight()) < 0.1 && Math.abs(min - line.getHeight()) > 1) {
            score += 0.5;
        }

        return score;
    }
}
