/*
 *  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.reader.gtfs;

import com.carrotsearch.hppc.IntHashSet;
import com.google.transit.realtime.GtfsRealtime;

import static com.google.transit.realtime.GtfsRealtime.TripUpdate.StopTimeUpdate.ScheduleRelationship.SKIPPED;

public class RealtimeFeed {
    private final IntHashSet blockedEdges;

    private RealtimeFeed(IntHashSet blockedEdges) {
        this.blockedEdges = blockedEdges;
    }

    public static RealtimeFeed empty() {
        return new RealtimeFeed(new IntHashSet());
    }

    public static RealtimeFeed fromProtobuf(GtfsStorage staticGtfs, GtfsRealtime.FeedMessage feedMessage) {
        final IntHashSet blockedEdges = new IntHashSet();
        feedMessage.getEntityList().stream()
            .filter(GtfsRealtime.FeedEntity::hasTripUpdate)
            .map(GtfsRealtime.FeedEntity::getTripUpdate)
            .forEach(tripUpdate -> {
                final int[] boardEdges = staticGtfs.getBoardEdgesForTrip().get(tripUpdate.getTrip());
                final int[] leaveEdges = staticGtfs.getAlightEdgesForTrip().get(tripUpdate.getTrip());
                tripUpdate.getStopTimeUpdateList().stream()
                        .filter(stopTimeUpdate -> stopTimeUpdate.getScheduleRelationship() == SKIPPED)
                        .mapToInt(stu -> stu.getStopSequence()-1) // stop sequence number is 1-based, not 0-based
                        .forEach(skippedStopSequenceNumber -> {
                            blockedEdges.add(boardEdges[skippedStopSequenceNumber]);
                            blockedEdges.add(leaveEdges[skippedStopSequenceNumber]);
                        });
            });
        return new RealtimeFeed(blockedEdges);
    }

    boolean isBlocked(int edgeId) {
        return blockedEdges.contains(edgeId);
    }
}