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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.http;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.graphhopper.GraphHopper;
import com.graphhopper.GraphHopperConfig;
import com.graphhopper.json.geo.JsonFeatureCollection;
import com.graphhopper.reader.gtfs.GraphHopperGtfs;
import com.graphhopper.reader.osm.GraphHopperOSM;
import com.graphhopper.routing.lm.LandmarkStorage;
import com.graphhopper.routing.util.spatialrules.SpatialRuleLookupHelper;
import com.graphhopper.util.Parameters;
import com.graphhopper.util.shapes.BBox;
import io.dropwizard.lifecycle.Managed;
import org.locationtech.jts.geom.Envelope;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

import static com.graphhopper.util.Helper.UTF_CS;

public class GraphHopperManaged implements Managed {

    private final Logger logger = LoggerFactory.getLogger(getClass());
    private final GraphHopper graphHopper;

    public GraphHopperManaged(GraphHopperConfig configuration, ObjectMapper objectMapper) {
        ObjectMapper localObjectMapper = objectMapper.copy();
        localObjectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        String splitAreaLocation = configuration.getString(Parameters.Landmark.PREPARE + "split_area_location", "");
        JsonFeatureCollection landmarkSplittingFeatureCollection;
        try (Reader reader = splitAreaLocation.isEmpty() ? new InputStreamReader(LandmarkStorage.class.getResource("map.geo.json").openStream(), UTF_CS) : new InputStreamReader(new FileInputStream(splitAreaLocation), UTF_CS)) {
            landmarkSplittingFeatureCollection = localObjectMapper.readValue(reader, JsonFeatureCollection.class);
        } catch (IOException e1) {
            logger.error("Problem while reading border map GeoJSON. Skipping this.", e1);
            landmarkSplittingFeatureCollection = null;
        }
        if (configuration.has("gtfs.file")) {
            graphHopper = new GraphHopperGtfs(configuration);
        } else {
            graphHopper = new GraphHopperOSM(landmarkSplittingFeatureCollection).forServer();
        }
        if (!configuration.getString("spatial_rules.location", "").isEmpty()) {
            throw new RuntimeException("spatial_rules.location has been deprecated. Please use spatial_rules.borders_directory instead.");
        }
        String spatialRuleBordersDirLocation = configuration.getString("spatial_rules.borders_directory", "");
        if (!spatialRuleBordersDirLocation.isEmpty()) {
            final BBox maxBounds = BBox.parseBBoxString(configuration.getString("spatial_rules.max_bbox", "-180, 180, -90, 90"));
            final Path bordersDirectory = Paths.get(spatialRuleBordersDirLocation);
            List jsonFeatureCollections = new ArrayList<>();
            try (DirectoryStream stream = Files.newDirectoryStream(bordersDirectory, "*.{geojson,json}")) {
                for (Path borderFile : stream) {
                    try (BufferedReader reader = Files.newBufferedReader(borderFile, StandardCharsets.UTF_8)) {
                        JsonFeatureCollection jsonFeatureCollection = localObjectMapper.readValue(reader, JsonFeatureCollection.class);
                        jsonFeatureCollections.add(jsonFeatureCollection);
                    }
                }
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
            SpatialRuleLookupHelper.buildAndInjectCountrySpatialRules(graphHopper,
                    new Envelope(maxBounds.minLon, maxBounds.maxLon, maxBounds.minLat, maxBounds.maxLat), jsonFeatureCollections);
        }
        graphHopper.init(configuration);
    }

    @Override
    public void start() {
        graphHopper.importOrLoad();
        logger.info("loaded graph at:{}, data_reader_file:{}, encoded values:{}, {}",
                graphHopper.getGraphHopperLocation(), graphHopper.getDataReaderFile(),
                graphHopper.getEncodingManager().toEncodedValuesAsString(),
                graphHopper.getGraphHopperStorage().toDetailsString());
    }

    public GraphHopper getGraphHopper() {
        return graphHopper;
    }

    @Override
    public void stop() {
        graphHopper.close();
    }


}