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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 static edu.mines.jtk.ogl.Gl.*;

/**
 * OpenGL light model state.
 * @author Dave Hale, Colorado School of Mines
 * @version 2005.05.31
 */
public class LightModelState implements State {

  /**
   * Constructs light model state.
   */
  public LightModelState() {
  }

  /**
   * Determines whether the ambient color attribute is set.
   * @return true, if set; false, otherwise.
   */
  public boolean hasAmbient() {
    return _ambientSet;
  }

  /**
   * Gets the ambient color attribute.
   * @return the ambient color.
   */
  public Color getAmbient() {
    return toColor(_ambient);
  }

  /**
   * Sets the ambient color attribute.
   * @param color the ambient color.
   */
  public void setAmbient(Color color) {
    _ambient = toArray(color);
    _ambientSet = true;
  }

  /**
   * Unsets the ambient color attribute.
   */
  public void unsetAmbient() {
    _ambient = _ambientDefault;
    _ambientSet = false;
  }

  /**
   * Determines whether the color control attribute is set.
   * @return true, if set; false, otherwise.
   */
  public boolean hasColorControl() {
    return _colorControlSet;
  }

  /**
   * Gets the color control attribute.
   * @return the color control.
   */
  public int getColorControl() {
    return _colorControl;
  }

  /**
   * Sets the color control attribute.
   * @param control the color control.
   */
  public void setColorControl(int control) {
    _colorControl = control;
    _colorControlSet = true;
  }

  /**
   * Unsets the color control attribute.
   */
  public void unsetColorControl() {
    _colorControl = _colorControlDefault;
    _colorControlSet = false;
  }

  /**
   * Determines whether the local viewer attribute is set.
   * @return true, if set; false, otherwise.
   */
  public boolean hasLocalViewer() {
    return _localViewerSet;
  }

  /**
   * Gets the local viewer attribute.
   * @return the local viewer.
   */
  public boolean getLocalViewer() {
    return _localViewer;
  }

  /**
   * Sets the local viewer attribute.
   * @param local the local viewer.
   */
  public void setLocalViewer(boolean local) {
    _localViewer = local;
    _localViewerSet = true;
  }

  /**
   * Unsets the local viewer attribute.
   */
  public void unsetLocalViewer() {
    _localViewer = _localViewerDefault;
    _localViewerSet = false;
  }

  /**
   * Determines whether the two-sided lighting attribute is set.
   * @return true, if set; false, otherwise.
   */
  public boolean hasTwoSide() {
    return _twoSideSet;
  }

  /**
   * Gets the two-sided lighting attribute.
   * @return the two-sided lighting.
   */
  public boolean getTwoSide() {
    return _twoSide;
  }

  /**
   * Sets the two-sided lighting attribute.
   * @param local the two-sided lighting.
   */
  public void setTwoSide(boolean local) {
    _twoSide = local;
    _twoSideSet = true;
  }

  /**
   * Unsets the two-sided lighting attribute.
   */
  public void unsetTwoSide() {
    _twoSide = _twoSideDefault;
    _twoSideSet = false;
  }

  public void apply() {
    if (_ambientSet)
      glLightModelfv(GL_LIGHT_MODEL_AMBIENT,_ambient,0);
    if (_colorControlSet)
      glLightModelf(GL_LIGHT_MODEL_COLOR_CONTROL,_colorControl);
    if (_localViewerSet)
      glLightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER,(_localViewer?1.0f:0.0f));
    if (_twoSideSet)
      glLightModelf(GL_LIGHT_MODEL_TWO_SIDE,(_twoSide?1.0f:0.0f));
  }

  public int getAttributeBits() {
    return GL_LIGHTING;
  }

  private static float[] _ambientDefault = {0.2f,0.2f,0.2f,1.0f};
  private float[] _ambient = _ambientDefault;
  private boolean _ambientSet;

  private static int _colorControlDefault = GL_SINGLE_COLOR;
  private int _colorControl = _colorControlDefault;
  private boolean _colorControlSet;

  private static boolean _localViewerDefault = false;
  private boolean _localViewer = _localViewerDefault;
  private boolean _localViewerSet;

  private static boolean _twoSideDefault = false;
  private boolean _twoSide = _twoSideDefault;
  private boolean _twoSideSet;

  private static float[] toArray(Color c) {
    float r = c.getRed()/255.0f;
    float g = c.getGreen()/255.0f;
    float b = c.getBlue()/255.0f;
    float a = c.getAlpha()/255.0f;
    return new float[]{r,g,b,a};
  }

  private static Color toColor(float[] a) {
    return new Color(a[0],a[1],a[2],a[3]);
  }
}