#include "Object.h"
#include <iostream>

using namespace std;

Object::Object() {
  int i;
  display = true;
  drawType = GL_LINES;
  color = vec3(1.0, 0.0, 0.0);

  transform = mat4(1.0);

  return;
}

Object::~Object() {
   glDeleteBuffers(2, bufferIDs);
   glDeleteVertexArrays(1, &VAONumber);
   return;
}

void Object::Bind(GLuint prog) {
  GLint   attribLoc;

  Init();

  glGenVertexArrays(1, &VAONumber);

  glBindVertexArray(VAONumber);
  glGenBuffers(2,bufferIDs);

  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferIDs[0]);
  glBufferData(GL_ELEMENT_ARRAY_BUFFER, index.size()*sizeof(GLushort),
        index.data(), GL_STATIC_DRAW);

  glBindBuffer(GL_ARRAY_BUFFER, bufferIDs[1]);
  glBufferData(GL_ARRAY_BUFFER, points.size()*sizeof(Vertex),
        points.data(), GL_STATIC_DRAW);

  attribLoc = glGetAttribLocation(prog, "vPosition");
  glVertexAttribPointer(attribLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
                    BUFFER_OFFSET(offsetof(Vertex,position)));
  glEnableVertexAttribArray(attribLoc);

  attribLoc = glGetAttribLocation(prog, "vColor");
  glVertexAttribPointer(attribLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex)
                   , BUFFER_OFFSET(offsetof(Vertex, color)));
  glEnableVertexAttribArray(attribLoc); 

  glBindVertexArray(0);

  // clean up, we no longer need the data
  pointCount = index.size();
  index.clear();
  points.clear();

  objectMatrixLoc = glGetUniformLocation(prog, "objectM");

  return;
}

void Object::Display() {
  

  if (display) {
      DisplaySetup();

      glEnable(GL_CULL_FACE);
      glCullFace(GL_BACK);

      glUniformMatrix4fv(objectMatrixLoc, 1, true, transform);

      glBindVertexArray(VAONumber);
      glDrawElements(drawType, pointCount, GL_UNSIGNED_SHORT, NULL);

      glBindVertexArray(0);
      glDisable(GL_CULL_FACE);
  }

  return;
}