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/*
 *  Licensed to GraphHopper GmbH under one or more contributor
 *  license agreements. See the NOTICE file distributed with this work for
 *  additional information regarding copyright ownership.
 *
 *  GraphHopper GmbH licenses this file to you 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.graphhopper.routing.util.parsers;

import com.graphhopper.reader.ReaderWay;
import com.graphhopper.routing.ev.EncodedValue;
import com.graphhopper.routing.ev.EncodedValueLookup;
import com.graphhopper.routing.ev.IntEncodedValue;
import com.graphhopper.routing.ev.MtbRating;
import com.graphhopper.storage.IntsRef;

import java.util.List;

/**
 * Parses the mountain biking difficulty.
 * A mapping mtb:scale=0 corresponds to 1 and mtb:scale=1 to 2 until 7.
 *
 * @see Key:mtb:scale for details on OSM mountain biking difficulties.
 * @see Single Trail Scale
 */
public class OSMMtbRatingParser implements TagParser {

    private final IntEncodedValue mtbRatingEnc;

    public OSMMtbRatingParser() {
        this.mtbRatingEnc = MtbRating.create();
    }

    @Override
    public void createEncodedValues(EncodedValueLookup lookup, List link) {
        link.add(mtbRatingEnc);
    }

    @Override
    public IntsRef handleWayTags(IntsRef edgeFlags, ReaderWay readerWay, boolean ferry, IntsRef relationFlags) {
        String scale = readerWay.getTag("mtb:scale");
        int rating = 0;
        if (scale != null) {
            if (scale.length() == 2 && (scale.charAt(1) == '+' || scale.charAt(1) == '-'))
                scale = scale.substring(0, 1);
            try {
                int scaleAsInt = Integer.parseInt(scale);
                rating = scaleAsInt + 1;
            } catch (Exception ex) {
            }
        }

        if (rating != 0)
            mtbRatingEnc.setInt(false, edgeFlags, rating);

        return edgeFlags;
    }
}