package org.opentrafficsim.road.network.lane;
   
   import java.util.Map;
   
   import org.djunits.value.vdouble.scalar.Length;
   import org.djunits.value.vdouble.scalar.Speed;
   import org.djutils.draw.line.PolyLine2d;
   import org.djutils.draw.line.Polygon2d;
   import org.djutils.draw.point.Point2d;
  import org.djutils.exceptions.Try;
  import org.opentrafficsim.core.geometry.ContinuousLine;
  import org.opentrafficsim.core.geometry.ContinuousLine.ContinuousDoubleFunction;
  import org.opentrafficsim.core.geometry.ContinuousStraight;
  import org.opentrafficsim.core.geometry.FractionalLengthData;
  import org.opentrafficsim.core.gtu.GtuType;
  
  /**
   * This class is an extension (conceptually, not an actual java extension) of {@code OtsGeometryUtil}. This utility has access
   * to classes that are specific to the ots-road project, and required to define geometry of objects in this context.
   * <p>
   * Copyright (c) 2023-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * </p>
   * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
   * @author <a href="https://github.com/peter-knoppers">Peter Knoppers</a>
   * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
   */
  public final class LaneGeometryUtil
  {
  
      /**
       * Utility class.
       */
      private LaneGeometryUtil()
      {
          //
      }
  
      /**
       * Returns the contour based on left and right edge.
       * @param leftEdge left edge, in design line direction.
       * @param rightEdge right edge, in design line direction.
       * @return a closed loop of both edges.
       */
      public static Polygon2d getContour(final PolyLine2d leftEdge, final PolyLine2d rightEdge)
      {
          Point2d[] points = new Point2d[leftEdge.size() + rightEdge.size() + 1];
          System.arraycopy(leftEdge.getPointList().toArray(), 0, points, 0, leftEdge.size());
          System.arraycopy(rightEdge.reverse().getPointList().toArray(), 0, points, leftEdge.size(), rightEdge.size());
          points[points.length - 1] = points[0]; // close loop
          return new Polygon2d(true, points);
      }
  
      /**
       * Creates a simple straight lane. This method exists to create lanes for simple tests.
       * @param link link.
       * @param id id.
       * @param offset end offset.
       * @param width end width.
       * @param laneType lane type.
       * @param speedLimits speed limit map.
       * @return lane.
       */
      public static Lane createStraightLane(final CrossSectionLink link, final String id, final Length offset, final Length width,
              final LaneType laneType, final Map<GtuType, Speed> speedLimits)
      {
          return createStraightLane(link, id, offset, offset, width, width, laneType, speedLimits);
      }
  
      /**
       * Creates a simple straight lane. This method exists to create lanes for simple tests.
       * @param link link.
       * @param id id.
       * @param startOffset start offset.
       * @param endOffset end offset.
       * @param startWidth start width.
       * @param endWidth end width.
       * @param laneType lane type.
       * @param speedLimits speed limit map.
       * @return lane.
       */
      public static Lane createStraightLane(final CrossSectionLink link, final String id, final Length startOffset,
              final Length endOffset, final Length startWidth, final Length endWidth, final LaneType laneType,
              final Map<GtuType, Speed> speedLimits)
      {
          ContinuousDoubleFunction offset = FractionalLengthData.of(0.0, startOffset.si, 1.0, endOffset.si);
          ContinuousDoubleFunction width = FractionalLengthData.of(0.0, startWidth.si, 1.0, endWidth.si);
          return createStraightLane(link, id, offset, width, laneType, speedLimits);
      }
  
      /**
       * Creates a simple straight lane. This method exists to create lanes for simple tests.
       * @param link link
       * @param id id
       * @param offset offset information
       * @param width offset information
       * @param laneType lane type
       * @param speedLimits speed limit map
       * @return lane
      */
     public static Lane createStraightLane(final CrossSectionLink link, final String id, final ContinuousDoubleFunction offset,
             final ContinuousDoubleFunction width, final LaneType laneType, final Map<GtuType, Speed> speedLimits)
     {
         ContinuousLine designLine = new ContinuousStraight(
                 Try.assign(() -> link.getDesignLine().getLocationPointFraction(0.0), "Link should have a valid design line."),
                 link.getLength().si);
         return Try.assign(
                 () -> new Lane(link, id, CrossSectionGeometry.of(designLine, null, offset, width), laneType, speedLimits),
                 "Network exception.");
     }
 
     /**
      * Creates a simple straight lane. This method exists to create lanes for simple tests.
      * @param type stripe data.
      * @param id id
      * @param link link.
      * @param offset end offset.
      * @param width end width.
      * @return lane.
      */
     public static Stripe createStraightStripe(final StripeData type, final String id, final CrossSectionLink link,
             final Length offset, final Length width)
     {
         ContinuousLine designLine = new ContinuousStraight(
                 Try.assign(() -> link.getDesignLine().getLocationPointFraction(0.0), "Link should have a valid design line."),
                 link.getLength().si);
         ContinuousDoubleFunction offsetFunc = FractionalLengthData.of(0.0, offset.si, 1.0, offset.si);
         ContinuousDoubleFunction widthFunc = FractionalLengthData.of(0.0, width.si, 1.0, width.si);
         return Try.assign(() -> new Stripe(id, type, link, CrossSectionGeometry.of(designLine, null, offsetFunc, widthFunc)),
                 "Network exception.");
     }
 
     /**
      * Creates a simple straight shoulder. This method exists to create shoulders for simple tests.
      * @param link link.
      * @param id id.
      * @param startOffset start offset.
      * @param endOffset end offset.
      * @param startWidth start width.
      * @param endWidth end width.
      * @param laneType lane type.
      * @return lane.
      */
     public static Object createStraightShoulder(final CrossSectionLink link, final String id, final Length startOffset,
             final Length endOffset, final Length startWidth, final Length endWidth, final LaneType laneType)
     {
         ContinuousLine designLine = new ContinuousStraight(
                 Try.assign(() -> link.getDesignLine().getLocationPointFraction(0.0), "Link should have a valid design line."),
                 link.getLength().si);
         ContinuousDoubleFunction offset = FractionalLengthData.of(0.0, startOffset.si, 1.0, endOffset.si);
         ContinuousDoubleFunction width = FractionalLengthData.of(0.0, startWidth.si, 1.0, endWidth.si);
         return Try.assign(() -> new Shoulder(link, id, CrossSectionGeometry.of(designLine, null, offset, width), laneType),
                 "Network exception.");
     }
 }