/*
Copyright (c) 2024, MapTiler.com & OpenMapTiles contributors.
All rights reserved.

Code license: BSD 3-Clause License

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  list of conditions and the following disclaimer.

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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Design license: CC-BY 4.0

See https://github.com/openmaptiles/openmaptiles/blob/master/LICENSE.md for details on usage
*/
package org.openmaptiles.layers;

import static org.openmaptiles.layers.Transportation.highwayClass;
import static org.openmaptiles.layers.Transportation.highwaySubclass;
import static org.openmaptiles.layers.Transportation.isFootwayOrSteps;
import static org.openmaptiles.util.Utils.*;

import com.carrotsearch.hppc.LongArrayList;
import com.carrotsearch.hppc.LongByteMap;
import com.carrotsearch.hppc.LongHashSet;
import com.carrotsearch.hppc.LongSet;
import com.onthegomap.planetiler.FeatureCollector;
import com.onthegomap.planetiler.FeatureMerge;
import com.onthegomap.planetiler.ForwardingProfile;
import com.onthegomap.planetiler.VectorTile;
import com.onthegomap.planetiler.collection.Hppc;
import com.onthegomap.planetiler.config.PlanetilerConfig;
import com.onthegomap.planetiler.reader.osm.OsmElement;
import com.onthegomap.planetiler.stats.Stats;
import com.onthegomap.planetiler.util.Parse;
import com.onthegomap.planetiler.util.Translations;
import com.onthegomap.planetiler.util.ZoomFunction;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import org.openmaptiles.OpenMapTilesProfile;
import org.openmaptiles.generated.OpenMapTilesSchema;
import org.openmaptiles.generated.Tables;
import org.openmaptiles.util.OmtLanguageUtils;

/**
 * Defines the logic for generating map elements for road, shipway, rail, and path names in the {@code
 * transportation_name} layer from source features.
 * <p>
 * This class is ported to Java from
 * <a href="https://github.com/openmaptiles/openmaptiles/tree/master/layers/transportation_name">OpenMapTiles
 * transportation_name sql files</a>.
 */
public class TransportationName implements
  OpenMapTilesSchema.TransportationName,
  Tables.OsmHighwayPoint.Handler,
  Tables.OsmHighwayLinestring.Handler,
  Tables.OsmAerialwayLinestring.Handler,
  Tables.OsmShipwayLinestring.Handler,
  ForwardingProfile.LayerPostProcessor,
  OpenMapTilesProfile.IgnoreWikidata,
  ForwardingProfile.OsmNodePreprocessor,
  ForwardingProfile.OsmWayPreprocessor {

  /*
   * Generate road names from OSM data.  Route networkType and ref are copied
   * from relations that roads are a part of - except in Great Britain which
   * uses a naming convention instead of relations.
   *
   * The goal is to make name linestrings as long as possible to give clients
   * the best chance of showing road names at different zoom levels, so do not
   * limit linestrings by length at process time and merge them at tile
   * render-time.
   *
   * Any 3-way nodes and intersections break line merging so set the
   * transportation_name_limit_merge argument to true to add temporary
   * "is link" and "relation" keys to prevent opposite directions of a
   * divided highway or on/off ramps from getting merged for main highways.
   */

  // extra temp key used to group on/off-ramps separately from main highways
  private static final String LINK_TEMP_KEY = "__islink";
  private static final String RELATION_ID_TEMP_KEY = "__relid";

  private static final ZoomFunction.MeterToPixelThresholds MIN_LENGTH = ZoomFunction.meterThresholds()
    .put(6, 20_000)
    .put(7, 20_000)
    .put(8, 14_000)
    .put(9, 8_000)
    .put(10, 4_000)
    .put(11, 2_000);
  private final boolean brunnel;
  private final boolean sizeForShield;
  private final boolean limitMerge;
  private final PlanetilerConfig config;
  private final boolean minorRefs;
  private Transportation transportation;
  private final LongByteMap motorwayJunctionHighwayClasses = Hppc.newLongByteHashMap();
  private final LongSet motorwayJunctionNodes = new LongHashSet();
  private final Translations translations;

  public TransportationName(Translations translations, PlanetilerConfig config, Stats stats) {
    this.config = config;
    this.translations = translations;
    this.brunnel = config.arguments().getBoolean(
      "transportation_name_brunnel",
      "transportation_name layer: set to false to omit brunnel and help merge long highways",
      false
    );
    this.sizeForShield = config.arguments().getBoolean(
      "transportation_name_size_for_shield",
      "transportation_name layer: allow road names on shorter segments (ie. they will have a shield)",
      false
    );
    this.limitMerge = config.arguments().getBoolean(
      "transportation_name_limit_merge",
      "transportation_name layer: limit merge so we don't combine different relations to help merge long highways",
      false
    );
    this.minorRefs = config.arguments().getBoolean(
      "transportation_name_minor_refs",
      "transportation_name layer: include name and refs from minor road networks if not present on a way",
      false
    );
  }

  public void needsTransportationLayer(Transportation transportation) {
    this.transportation = transportation;
  }


  @Override
  public void preprocessOsmNode(OsmElement.Node node) {
    if (node.hasTag("highway", "motorway_junction")) {
      synchronized (motorwayJunctionNodes) {
        motorwayJunctionNodes.add(node.id());
      }
    }
  }

  @Override
  public void preprocessOsmWay(OsmElement.Way way) {
    String highway = way.getString("highway");
    if (highway != null) {
      HighwayClass cls = HighwayClass.from(highway);
      if (cls != HighwayClass.UNKNOWN) {
        LongArrayList nodes = way.nodes();
        for (int i = 0; i < nodes.size(); i++) {
          long node = nodes.get(i);
          if (motorwayJunctionNodes.contains(node)) {
            synchronized (motorwayJunctionHighwayClasses) {
              byte oldValue = motorwayJunctionHighwayClasses.getOrDefault(node, HighwayClass.UNKNOWN.value);
              byte newValue = cls.value;
              if (newValue > oldValue) {
                motorwayJunctionHighwayClasses.put(node, newValue);
              }
            }
          }
        }
      }
    }
  }

  @Override
  public void process(Tables.OsmHighwayPoint element, FeatureCollector features) {
    long id = element.source().id();
    byte value = motorwayJunctionHighwayClasses.getOrDefault(id, (byte) -1);
    if (value > 0) {
      HighwayClass cls = HighwayClass.from(value);
      if (cls != HighwayClass.UNKNOWN) {
        String subclass = FieldValues.SUBCLASS_JUNCTION;
        String ref = element.ref();

        features.point(LAYER_NAME)
          .setBufferPixels(BUFFER_SIZE)
          .putAttrs(OmtLanguageUtils.getNames(element.source().tags(), translations))
          .setAttr(Fields.REF, ref)
          .setAttr(Fields.REF_LENGTH, ref != null ? ref.length() : null)
          .setAttr(Fields.CLASS, highwayClass(cls.highwayValue, null, null, null))
          .setAttr(Fields.SUBCLASS, subclass)
          .setAttr(Fields.LAYER, nullIfLong(element.layer(), 0))
          .setSortKeyDescending(element.zOrder())
          .setMinZoom(10);
      }
    }
  }

  @Override
  public void process(Tables.OsmHighwayLinestring element, FeatureCollector features) {
    String ref = element.ref();
    List<Transportation.RouteRelation> relations = transportation.getRouteRelations(element);
    Transportation.RouteRelation firstRelationWithNetwork = relations.stream()
      .filter(rel -> rel.networkType() != null)
      .findFirst()
      .orElse(null);

    if (firstRelationWithNetwork != null && !nullOrEmpty(firstRelationWithNetwork.ref())) {
      ref = firstRelationWithNetwork.ref();
    }

    // if transportation_name_minor_refs flag set and we don't have a ref yet, then pull it from any network
    if (nullOrEmpty(ref) && minorRefs && !relations.isEmpty()) {
      ref = relations.stream()
        .map(r -> r.ref())
        .filter(r -> !nullOrEmpty(r))
        .findFirst()
        .orElse(null);
    }

    String name = nullIfEmpty(element.name());
    ref = nullIfEmpty(ref);
    String highway = nullIfEmpty(element.highway());

    String highwayClass = highwayClass(element.highway(), null, element.construction(), element.manMade());
    if (element.isArea() || highway == null || highwayClass == null || (name == null && ref == null)) {
      return;
    }

    boolean isLink = Transportation.isLink(highway);
    String baseClass = highwayClass.replace("_construction", "");

    int minzoom = FieldValues.CLASS_TRUNK.equals(baseClass) ? 8 :
      FieldValues.CLASS_MOTORWAY.equals(baseClass) ? 6 :
      isLink ? 13 : 12; // fallback - get from line minzoom, but floor at 12

    // inherit min zoom threshold from visible road, and ensure we never show a label on a road that's not visible yet.
    minzoom = Math.max(minzoom, transportation.getMinzoom(element, highwayClass));
    if (minzoom > config.maxzoom()) {
      return;
    }

    FeatureCollector.Feature feature = features.line(LAYER_NAME)
      .setBufferPixels(BUFFER_SIZE)
      .setBufferPixelOverrides(MIN_LENGTH)
      // TODO abbreviate road names - can't port osml10n because it is AGPL
      .putAttrs(OmtLanguageUtils.getNames(element.source().tags(), translations))
      .setAttr(Fields.REF, ref)
      .setAttr(Fields.REF_LENGTH, ref != null ? ref.length() : null)
      .setAttr(Fields.NETWORK,
        firstRelationWithNetwork != null ? firstRelationWithNetwork.networkType().name : !nullOrEmpty(ref) ? "road" :
          null)
      .setAttr(Fields.CLASS, highwayClass)
      .setAttr(Fields.SUBCLASS, highwaySubclass(highwayClass, null, highway))
      .setMinPixelSize(0)
      .setSortKey(element.zOrder())
      .setMinZoom(minzoom);

    // populate route_1_<something>, route_2_<something>, ... route_n_<something> tags and remove duplicates
    Set<String> routes = new HashSet<>();
    for (var route : relations) {
      String routeString = route.network() + "=" +
        coalesce(route.ref(), "") + "=" +
        coalesce(route.name(), "") + "=" +
        coalesce(route.colour(), "");
      if (routes.add(routeString)) {
        String keyPrefix = "route_" + routes.size() + "_";

        feature.setAttr(keyPrefix + "network", route.network());
        feature.setAttr(keyPrefix + "ref", nullIfEmpty(route.ref()));
        feature.setAttr(keyPrefix + "name", route.name());
        feature.setAttr(keyPrefix + "colour", route.colour());
      }
    }

    if (brunnel) {
      // from OMT: "Drop brunnel if length of way < 2% of tile width (less than 3 pixels)"
      feature.setAttrWithMinSize(Fields.BRUNNEL, brunnel(element.isBridge(), element.isTunnel(), element.isFord()),
        3, 4, 12);
    }

    /*
     * to help group roads into longer segments, add temporary tags to limit which segments get grouped together. Since
     * a divided highway typically has a separate relation for each direction, this ends up keeping segments going
     * opposite directions group getting grouped together and confusing the line merging process
     */
    if (limitMerge) {
      feature
        .setAttr(LINK_TEMP_KEY, isLink ? 1 : 0)
        .setAttr(RELATION_ID_TEMP_KEY, firstRelationWithNetwork == null ? null : firstRelationWithNetwork.id());
    }

    if (isFootwayOrSteps(highway)) {
      feature
        .setAttrWithMinzoom(Fields.LAYER, nullIfLong(element.layer(), 0), 12)
        .setAttrWithMinzoom(Fields.LEVEL, Parse.parseLongOrNull(element.source().getTag("level")), 12)
        .setAttrWithMinzoom(Fields.INDOOR, element.indoor() ? 1 : null, 12);
    }
  }

  @Override
  public void process(Tables.OsmAerialwayLinestring element, FeatureCollector features) {
    if (!nullOrEmpty(element.name())) {
      features.line(LAYER_NAME)
        .setBufferPixels(BUFFER_SIZE)
        .setBufferPixelOverrides(MIN_LENGTH)
        .putAttrs(OmtLanguageUtils.getNames(element.source().tags(), translations))
        .setAttr(Fields.CLASS, "aerialway")
        .setAttr(Fields.SUBCLASS, element.aerialway())
        .setMinPixelSize(0)
        .setSortKey(element.zOrder())
        .setMinZoom(12);
    }
  }

  @Override
  public void process(Tables.OsmShipwayLinestring element, FeatureCollector features) {
    if (!nullOrEmpty(element.name())) {
      features.line(LAYER_NAME)
        .setBufferPixels(BUFFER_SIZE)
        .setBufferPixelOverrides(MIN_LENGTH)
        .putAttrs(OmtLanguageUtils.getNames(element.source().tags(), translations))
        .setAttr(Fields.CLASS, element.shipway())
        .setMinPixelSize(0)
        .setSortKey(element.zOrder())
        .setMinZoom(12);
    }
  }

  @Override
  public List<VectorTile.Feature> postProcess(int zoom, List<VectorTile.Feature> items) {
    double tolerance = config.tolerance(zoom);
    double minLength = coalesce(MIN_LENGTH.apply(zoom), 0).doubleValue();
    // TODO tolerances:
    // z6: (tolerance: 500)
    // z7: (tolerance: 200)
    // z8: (tolerance: 120)
    // z9-11: (tolerance: 50)
    Function<Map<String, Object>, Double> lengthLimitCalculator =
      zoom >= 14 ? (p -> 0d) :
        minLength > 0 ? (p -> minLength) :
        this::getMinLengthForName;
    var result = FeatureMerge.mergeLineStrings(items, lengthLimitCalculator, tolerance, BUFFER_SIZE);
    if (limitMerge) {
      // remove temp keys that were just used to improve line merging
      for (var feature : result) {
        feature.tags().remove(LINK_TEMP_KEY);
        feature.tags().remove(RELATION_ID_TEMP_KEY);
      }
    }
    return result;
  }

  /** Returns the minimum pixel length that a name will fit into. */
  private double getMinLengthForName(Map<String, Object> attrs) {
    Object ref = attrs.get(Fields.REF);
    Object name = coalesce(attrs.get(Fields.NAME), ref);
    return (sizeForShield && ref instanceof String) ? 6 :
      name instanceof String str ? str.length() * 6 : Double.MAX_VALUE;
  }

  private enum HighwayClass {
    MOTORWAY("motorway", 6),
    TRUNK("trunk", 5),
    PRIMARY("primary", 4),
    SECONDARY("secondary", 3),
    TERTIARY("tertiary", 2),
    UNCLASSIFIED("unclassified", 1),
    UNKNOWN("", 0);

    private static final Map<String, HighwayClass> indexByString = new HashMap<>();
    private static final Map<Byte, HighwayClass> indexByByte = new HashMap<>();
    final byte value;
    final String highwayValue;

    HighwayClass(String highwayValue, int id) {
      this.highwayValue = highwayValue;
      this.value = (byte) id;
    }

    static {
      Arrays.stream(values()).forEach(cls -> {
        indexByString.put(cls.highwayValue, cls);
        indexByByte.put(cls.value, cls);
      });
    }

    static HighwayClass from(String highway) {
      return indexByString.getOrDefault(highway, UNKNOWN);
    }

    static HighwayClass from(byte value) {
      return indexByByte.getOrDefault(value, UNKNOWN);
    }
  }
}