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/****************************************************************************
Copyright 2004, Colorado School of Mines and others.
Licensed 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 edu.mines.jtk.sgl;

import java.awt.*;
import java.nio.FloatBuffer;

import static edu.mines.jtk.ogl.Gl.*;
import edu.mines.jtk.util.Direct;


/**
 * An axis-aligned handle box.
 * @author Dave Hale, Colorado School of Mines
 * @version 2005.06.30
 */
public class HandleBox extends Handle {

  /**
   * Constructs a handle box with specified center location.
   * @param p the center point.
   */
  public HandleBox(Point3 p) {
    super(p);
    this.addChild(_box);
  }

  /**
   * Constructs a handle box with specified center coordinates.
   * @param x the center x coordinate.
   * @param y the center y coordinate.
   * @param z the center z coordinate.
   */
  public HandleBox(double x, double y, double z) {
    super(x,y,z);
    this.addChild(_box);
  }

  /**
   * Sets the color of all handle boxes.
   * @param color the color.
   */
  public static void setColor(Color color) {
    _colorState.setColor(color);
    _box.dirtyDraw();
  }

  ///////////////////////////////////////////////////////////////////////////
  // private

  // Every handle box shares one instance of this class.
  private static class Box extends Node {
    Box() {
      StateSet states = new StateSet();
      _materialState = new MaterialState();
      _materialState.setColorMaterialFront(GL_AMBIENT_AND_DIFFUSE);
      _materialState.setSpecularFront(Color.white);
      _materialState.setShininessFront(100.0f);
      states.add(_materialState);
      _colorState = new ColorState();
      _colorState.setColor(Color.YELLOW);
      states.add(_colorState);
      setStates(states);
    }
    protected void draw(DrawContext dc) {
      glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
      glEnableClientState(GL_VERTEX_ARRAY);
      glEnableClientState(GL_NORMAL_ARRAY);
      glVertexPointer(3,GL_FLOAT,0,_vb);
      glNormalPointer(GL_FLOAT,0,_nb);
      glDrawArrays(GL_QUADS,0,24);
      glPopClientAttrib();
    }
    public void pick(PickContext pc) {
      Segment ps = pc.getPickSegment();
      for (int iside=0,index=0; iside<6; ++iside,index+=12) {
        double xa = _va[index+ 0];
        double ya = _va[index+ 1];
        double za = _va[index+ 2];
        double xb = _va[index+ 3];
        double yb = _va[index+ 4];
        double zb = _va[index+ 5];
        double xc = _va[index+ 6];
        double yc = _va[index+ 7];
        double zc = _va[index+ 8];
        double xd = _va[index+ 9];
        double yd = _va[index+10];
        double zd = _va[index+11];
        Point3 p = ps.intersectWithTriangle(xa,ya,za,xb,yb,zb,xc,yc,zc);
        Point3 q = ps.intersectWithTriangle(xa,ya,za,xc,yc,zc,xd,yd,zd);
        if (p!=null)
          pc.addResult(p);
        if (q!=null)
          pc.addResult(q);
      }
    }
    protected BoundingSphere computeBoundingSphere(boolean finite) {
      return new BoundingSphere(0.0,0.0,0.0,Math.sqrt(3.0));
    }
  }

  private static Box _box = new Box(); // the one box
  private static ColorState _colorState = new ColorState();
  private static MaterialState _materialState = new MaterialState();

  // Vertices and normals.
  private static float[] _va = {
    -1.0f,-1.0f,-1.0f, -1.0f,-1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f,-1.0f,
    -1.0f,-1.0f,-1.0f,  1.0f,-1.0f,-1.0f,  1.0f,-1.0f, 1.0f, -1.0f,-1.0f, 1.0f,
    -1.0f,-1.0f,-1.0f, -1.0f, 1.0f,-1.0f,  1.0f, 1.0f,-1.0f,  1.0f,-1.0f,-1.0f,
     1.0f,-1.0f,-1.0f,  1.0f, 1.0f,-1.0f,  1.0f, 1.0f, 1.0f,  1.0f,-1.0f, 1.0f,
    -1.0f, 1.0f,-1.0f, -1.0f, 1.0f, 1.0f,  1.0f, 1.0f, 1.0f,  1.0f, 1.0f,-1.0f,
    -1.0f,-1.0f, 1.0f,  1.0f,-1.0f, 1.0f,  1.0f, 1.0f, 1.0f, -1.0f, 1.0f, 1.0f,
  };
  private static float[] _na = {
    -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
     0.0f,-1.0f, 0.0f,  0.0f,-1.0f, 0.0f,  0.0f,-1.0f, 0.0f,  0.0f,-1.0f, 0.0f,
     0.0f, 0.0f,-1.0f,  0.0f, 0.0f,-1.0f,  0.0f, 0.0f,-1.0f,  0.0f, 0.0f,-1.0f,
     1.0f, 0.0f, 0.0f,  1.0f, 0.0f, 0.0f,  1.0f, 0.0f, 0.0f,  1.0f, 0.0f, 0.0f,
     0.0f, 1.0f, 0.0f,  0.0f, 1.0f, 0.0f,  0.0f, 1.0f, 0.0f,  0.0f, 1.0f, 0.0f,
     0.0f, 0.0f, 1.0f,  0.0f, 0.0f, 1.0f,  0.0f, 0.0f, 1.0f,  0.0f, 0.0f, 1.0f,
  };
  private static FloatBuffer _vb = Direct.newFloatBuffer(_va);
  private static FloatBuffer _nb = Direct.newFloatBuffer(_na);
}