/** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
 * Software engineering by
 *  Björnsen Beratende Ingenieure GmbH
 *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
 *
 * This file is Free Software under the GNU AGPL (>=v3)
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details.
 */
package org.dive4elements.river.client.client.ui.sinfo;

import org.dive4elements.river.client.client.ui.DatacageWidget.DatacageFilter;
import org.dive4elements.river.client.shared.model.AttrList;
import org.dive4elements.river.client.shared.model.DataCageNode;

/**
 * @author Gernot Belger
 */
final class WaterlevelSoundingYearFilter implements DatacageFilter {

    private final int soundingYear;

    public WaterlevelSoundingYearFilter(final int soundingYear) {
        this.soundingYear = soundingYear;
    }

    @Override
    public boolean accept(final DataCageNode node) {

        final AttrList attributes = node.getAttributes();

        if (isFolder(attributes))
            return true;

        final String year = attributes.getValue(WaterlevelSoundingSelectionController.ATTRIBUTE_YEAR);
        final Integer waterlevelYear = parseYear(year);
        if (waterlevelYear == null) {
            // should never happen, we should only show waterlevels that have a year
            return false;
        }

        final int diff = Math.abs(this.soundingYear - waterlevelYear);

        return diff <= getMaxYearDifference();
    }

    private int getMaxYearDifference() {

        if (this.soundingYear < 1918)
            return 25;

        if (1918 <= this.soundingYear && this.soundingYear < 1958)
            return 12;

        if (1958 <= this.soundingYear && this.soundingYear < 1998)
            return 6;

        // > 1998
        return 3;
    }

    static Integer parseYear(final String year) {

        if (year == null || year.trim().isEmpty())
            return null;

        try {
            return Integer.valueOf(year);
        }
        catch (final NumberFormatException e) {
            e.printStackTrace();
            return null;
        }
    }

    static boolean isFolder(final AttrList attributes) {
        if (attributes == null)
            return true;

        if (!attributes.hasAttribute("factory"))
            return true;

        return false;
    }
}