/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF 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
    *
    *      https://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.
   */
  
  /*
   * This is not the original file distributed by the Apache Software Foundation
   * It has been modified by the Hipparchus project
   */
  package org.hipparchus.geometry.partitioning;
  
  import java.io.IOException;
  import java.text.ParseException;
  import java.util.StringTokenizer;
  
  import org.hipparchus.geometry.Space;
  import org.hipparchus.geometry.euclidean.oned.Euclidean1D;
  import org.hipparchus.geometry.euclidean.oned.IntervalsSet;
  import org.hipparchus.geometry.euclidean.oned.OrientedPoint;
  import org.hipparchus.geometry.euclidean.oned.Vector1D;
  import org.hipparchus.geometry.euclidean.threed.Euclidean3D;
  import org.hipparchus.geometry.euclidean.threed.Plane;
  import org.hipparchus.geometry.euclidean.threed.PolyhedronsSet;
  import org.hipparchus.geometry.euclidean.threed.Vector3D;
  import org.hipparchus.geometry.euclidean.twod.Euclidean2D;
  import org.hipparchus.geometry.euclidean.twod.Line;
  import org.hipparchus.geometry.euclidean.twod.PolygonsSet;
  import org.hipparchus.geometry.euclidean.twod.Vector2D;
  import org.hipparchus.geometry.spherical.oned.ArcsSet;
  import org.hipparchus.geometry.spherical.oned.LimitAngle;
  import org.hipparchus.geometry.spherical.oned.S1Point;
  import org.hipparchus.geometry.spherical.oned.Sphere1D;
  import org.hipparchus.geometry.spherical.twod.Circle;
  import org.hipparchus.geometry.spherical.twod.Sphere2D;
  import org.hipparchus.geometry.spherical.twod.SphericalPolygonsSet;
  
  /** Class parsing a string representation of an {@link AbstractRegion}.
   * <p>
   * This class is intended for tests and debug purposes only.
   * </p>
   * @see RegionDumper
   */
  public class RegionParser {
  
      /** Private constructor for a utility class
       */
      private RegionParser() {
      }
  
      /** Parse a string representation of an {@link ArcsSet}.
       * @param s string to parse
       * @return parsed region
       * @exception IOException if the string cannot be read
       * @exception ParseException if the string cannot be parsed
       */
      public static ArcsSet parseArcsSet(final String s)
          throws IOException, ParseException {
          final TreeBuilder<Sphere1D> builder = new TreeBuilder<Sphere1D>("ArcsSet", s) {
  
              /** {@inheritDoc} */
              @Override
              protected LimitAngle parseHyperplane()
                  throws IOException, ParseException {
                  return new LimitAngle(new S1Point(getNumber()), getBoolean(), getNumber());
              }
  
          };
          return new ArcsSet(builder.getTree(), builder.getTolerance());
      }
  
      /** Parse a string representation of a {@link SphericalPolygonsSet}.
       * @param s string to parse
       * @return parsed region
       * @exception IOException if the string cannot be read
       * @exception ParseException if the string cannot be parsed
       */
      public static SphericalPolygonsSet parseSphericalPolygonsSet(final String s)
          throws IOException, ParseException {
          final TreeBuilder<Sphere2D> builder = new TreeBuilder<Sphere2D>("SphericalPolygonsSet", s) {
  
              /** {@inheritDoc} */
              @Override
              public Circle parseHyperplane()
                  throws IOException, ParseException {
                  return new Circle(new Vector3D(getNumber(), getNumber(), getNumber()), getNumber());
              }
  
         };
         return new SphericalPolygonsSet(builder.getTree(), builder.getTolerance());
     }
 
     /** Parse a string representation of an {@link IntervalsSet}.
      * @param s string to parse
      * @return parsed region
      * @exception IOException if the string cannot be read
      * @exception ParseException if the string cannot be parsed
      */
     public static IntervalsSet parseIntervalsSet(final String s)
         throws IOException, ParseException {
         final TreeBuilder<Euclidean1D> builder = new TreeBuilder<Euclidean1D>("IntervalsSet", s) {
 
             /** {@inheritDoc} */
             @Override
             public OrientedPoint parseHyperplane()
                 throws IOException, ParseException {
                 return new OrientedPoint(new Vector1D(getNumber()), getBoolean(), getNumber());
             }
 
         };
         return new IntervalsSet(builder.getTree(), builder.getTolerance());
     }
 
     /** Parse a string representation of a {@link PolygonsSet}.
      * @param s string to parse
      * @return parsed region
      * @exception IOException if the string cannot be read
      * @exception ParseException if the string cannot be parsed
      */
     public static PolygonsSet parsePolygonsSet(final String s)
         throws IOException, ParseException {
         final TreeBuilder<Euclidean2D> builder = new TreeBuilder<Euclidean2D>("PolygonsSet", s) {
 
             /** {@inheritDoc} */
             @Override
             public Line parseHyperplane()
                 throws IOException, ParseException {
                 return new Line(new Vector2D(getNumber(), getNumber()), getNumber(), getNumber());
             }
 
         };
         return new PolygonsSet(builder.getTree(), builder.getTolerance());
     }
 
     /** Parse a string representation of a {@link PolyhedronsSet}.
      * @param s string to parse
      * @return parsed region
      * @exception IOException if the string cannot be read
      * @exception ParseException if the string cannot be parsed
      */
     public static PolyhedronsSet parsePolyhedronsSet(final String s)
         throws IOException, ParseException {
         final TreeBuilder<Euclidean3D> builder = new TreeBuilder<Euclidean3D>("PolyhedronsSet", s) {
 
             /** {@inheritDoc} */
             @Override
             public Plane parseHyperplane()
                 throws IOException, ParseException {
                 return new Plane(new Vector3D(getNumber(), getNumber(), getNumber()),
                                  new Vector3D(getNumber(), getNumber(), getNumber()),
                                  getNumber());
             }
 
         };
         return new PolyhedronsSet(builder.getTree(), builder.getTolerance());
     }
 
     /** Local class for building an {@link AbstractRegion} tree.
      * @param <S> Type of the space.
      */
     private abstract static class TreeBuilder<S extends Space> {
 
         /** Keyword for tolerance. */
         private static final String TOLERANCE = "tolerance";
 
         /** Keyword for internal nodes. */
         private static final String INTERNAL  = "internal";
 
         /** Keyword for leaf nodes. */
         private static final String LEAF      = "leaf";
 
         /** Keyword for plus children trees. */
         private static final String PLUS      = "plus";
 
         /** Keyword for minus children trees. */
         private static final String MINUS     = "minus";
 
         /** Keyword for true flags. */
         private static final String TRUE      = "true";
 
         /** Keyword for false flags. */
         private static final String FALSE     = "false";
 
         /** Tree root. */
         private BSPTree<S> root;
 
         /** Tolerance. */
         private final double tolerance;
 
         /** Tokenizer parsing string representation. */
         private final StringTokenizer tokenizer;
 
         /** Simple constructor.
          * @param type type of the expected representation
          * @param s string representation
          * @exception IOException if the string cannot be read
          * @exception ParseException if the string cannot be parsed
          */
         public TreeBuilder(final String type, final String s)
             throws IOException, ParseException {
             root = null;
             tokenizer = new StringTokenizer(s);
             getWord(type);
             getWord(TOLERANCE);
             tolerance = getNumber();
             getWord(PLUS);
             root = new BSPTree<S>();
             parseTree(root);
             if (tokenizer.hasMoreTokens()) {
                 throw new ParseException("unexpected " + tokenizer.nextToken(), 0);
             }
         }
 
         /** Parse a tree.
          * @param node start node
          * @exception IOException if the string cannot be read
          * @exception ParseException if the string cannot be parsed
          */
         private void parseTree(final BSPTree<S> node)
             throws IOException, ParseException {
             if (INTERNAL.equals(getWord(INTERNAL, LEAF))) {
                 // this is an internal node, it has a cut sub-hyperplane (stored as a whole hyperplane)
                 // then a minus tree, then a plus tree
                 node.insertCut(parseHyperplane());
                 getWord(MINUS);
                 parseTree(node.getMinus());
                 getWord(PLUS);
                 parseTree(node.getPlus());
             } else {
                 // this is a leaf node, it has only an inside/outside flag
                 node.setAttribute(getBoolean());
             }
         }
 
         /** Get next word.
          * @param allowed allowed values
          * @return parsed word
          * @exception IOException if the string cannot be read
          * @exception ParseException if the string cannot be parsed
          */
         protected String getWord(final String ... allowed)
             throws IOException, ParseException {
             final String token = tokenizer.nextToken();
             for (final String a : allowed) {
                 if (a.equals(token)) {
                     return token;
                 }
             }
             throw new ParseException(token + " != " + allowed[0], 0);
         }
 
         /** Get next number.
          * @return parsed number
          * @exception IOException if the string cannot be read
          * @exception NumberFormatException if the string cannot be parsed
          */
         protected double getNumber()
             throws IOException, NumberFormatException {
             return Double.parseDouble(tokenizer.nextToken());
         }
 
         /** Get next boolean.
          * @return parsed boolean
          * @exception IOException if the string cannot be read
          * @exception ParseException if the string cannot be parsed
          */
         protected boolean getBoolean()
             throws IOException, ParseException {
             return getWord(TRUE, FALSE).equals(TRUE);
         }
 
         /** Get the built tree.
          * @return built tree
          */
         public BSPTree<S> getTree() {
             return root;
         }
 
         /** Get the tolerance.
          * @return tolerance
          */
         public double getTolerance() {
             return tolerance;
         }
 
         /** Parse an hyperplane.
          * @return next hyperplane from the stream
          * @exception IOException if the string cannot be read
          * @exception ParseException if the string cannot be parsed
          */
         protected abstract Hyperplane<S> parseHyperplane()
             throws IOException, ParseException;
 
     }
 
 }