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package com.vividsolutions.jtstest.testbuilder.geom;

import com.vividsolutions.jts.geom.*;

/**
 * Models the location of a point on a Geometry
 * 
 * @author Martin Davis
 *
 */
public class GeometryLocation 
{
  /**
   * The top-level geometry containing the location
   */
  private Geometry parent;
  /**
   * The Geometry component containing the location
   */
  private Geometry component;
  
  /**
   * The path of indexes to the component containing the location
   */
  private int[] componentPath;
  
  /**
   * The index of the vertex or segment the location occurs on
   */
  private int index;
  
  /**
   * Indicates whether this location is a vertex of the geometry
   */
  private boolean isVertex = true;
  
  /**
   * The actual coordinate for the location
   */
  private Coordinate pt;
  
  public GeometryLocation(Geometry parent, Geometry component, int[] componentPath) 
  {
    this.parent = parent;
    this.component = component;
    this.componentPath = componentPath;
  }

  public GeometryLocation(Geometry parent, Geometry component, int index, Coordinate pt) 
  {
    this.parent = parent;
    this.component = component;
    this.index = index;
    this.pt = pt;
  }

  public GeometryLocation(Geometry parent, Geometry component, int segmentIndex, boolean isVertex,
      Coordinate pt) 
  {
    this.parent = parent;
    this.component = component;
    this.index = segmentIndex;
    this.isVertex = isVertex;
    this.pt = pt;
  }

  public GeometryLocation(Geometry parent, Geometry component, int[] componentPath, int segmentIndex, boolean isVertex,
      Coordinate pt) 
  {
    this.parent = parent;
    this.component = component;
    this.componentPath = componentPath;
    this.index = segmentIndex;
    this.isVertex = isVertex;
    this.pt = pt;
  }

  public Geometry getComponent() 
  {
  	return component;
  }
  
  public Coordinate getCoordinate() { return pt; }
  
  public boolean isVertex() { return isVertex; }
  
  public Geometry insert()
  {
    return GeometryVertexInserter.insert(parent, (LineString) component, index, pt);
  }
  
  public Geometry delete()
  {
    return GeometryVertexDeleter.delete(parent, (LineString) component, index);
  }
  
  public double getLength()
  {
    if (isVertex()) return 0;
    Coordinate p1 = component.getCoordinates()[index + 1];
    return pt.distance(p1);
  }
  public String toString()
  {
    return pt.toString();
  }
  
  public String pathString()
  {
		StringBuffer buf = new StringBuffer();
		for (int i = 0; i < componentPath.length; i++) {
			if (i > 0) {
          buf.append(":");
      }
			buf.append(componentPath[i]);
		}
		return buf.toString();
  }
  
	public String toFacetString()
	{
		StringBuffer buf = new StringBuffer();
		
		// facet index
		buf.append("[");
		for (int i = 0; i < componentPath.length; i++) {
			if (i > 0) {
          buf.append(":");
      }
			buf.append(componentPath[i]);
		}
		buf.append(" ");
		buf.append(index);
		if (! isVertex()) {
			buf.append("-" + (index + 1));
		}
		buf.append("]  ");
		
		// facet value
    buf.append(isVertex() ? "POINT " : "LINESTRING ");

    buf.append("( ");
		buf.append(pt.x);
		buf.append(" ");
		buf.append(pt.y);
		if (! isVertex()) {
			Coordinate p1 = component.getCoordinates()[index + 1];
  		buf.append(", ");
  		buf.append(p1.x);
  		buf.append(" ");
  		buf.append(p1.y);		
		}
    buf.append(" )");
		return buf.toString();
	}

}