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package jogamp.opengl.glu.gl2.nurbs;
import jogamp.opengl.glu.nurbs.*;

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2;
import com.jogamp.opengl.GL2GL3;
import com.jogamp.opengl.glu.GLU;
import com.jogamp.opengl.glu.gl2.GLUgl2;

/**
 * Class rendering curves with OpenGL
 * @author Tomáš Hráský
 *
 */
class GL2CurveEvaluator implements CurveEvaluator {

  /**
   * Output triangles (for callback) or render curve
   */
  private boolean output_triangles;

  /**
   * OpenGL object
   */
  private final GL2 gl;

  /**
   * Not used
   */
  private int vertex_flag;

  /**
   * Not used
   */
  private int normal_flag;

  /**
   * Not used
   */
  private int color_flag;

  /**
   * Not used
   */
  private int texcoord_flag;

  /**
   * Number of bezier arc - used for color distinguishing of arcs forming NURBS curve
   */
  private int poradi;

  /**
   * Makes new Evaluator
   */
  public GL2CurveEvaluator() {
    gl = GLUgl2.getCurrentGL2();
  }

  /**
   * Pushes eval bit
   */
  @Override
  public void bgnmap1f() {
    // DONE
    if (output_triangles) {
      vertex_flag = 0;
      normal_flag = 0;
      color_flag = 0;
      texcoord_flag = 0;
    } else {
      gl.glPushAttrib(GL2.GL_EVAL_BIT);
    }

  }

  /**
   * Pops all OpenGL attributes
   */
  @Override
  public void endmap1f() {
    // DONE
    if (output_triangles) {

    } else {
      gl.glPopAttrib();
    }

  }

  /**
   * Initializes opengl evaluator
   * @param type curve type
   * @param ulo lowest u
   * @param uhi highest u
   * @param stride control point coords
   * @param order curve order
   * @param ps control points
   */
  @Override
  public void map1f(final int type, final float ulo, final float uhi, final int stride, final int order,
                    final CArrayOfFloats ps) {
    if (output_triangles) {
      // TODO code for callback (output_triangles probably indicates callback)
      //                System.out.println("TODO curveevaluator.map1f-output_triangles");
    } else {
      gl.glMap1f(type, ulo, uhi, stride, order, ps.getArray(), ps
                 .getPointer());

      // DEBUG - drawing bézier control points
      // gl.glColor3d(.5,.5,.5);
      // gl.glPointSize(5);
      // gl.glBegin(GL2.GL_POINTS);
      // float[] ctrlpoints=ps.getArray();
      // for(int i=ps.getPointer();i