#include "ColorCube.h"

void ColorCube::setup()
{
	std::vector<glm::vec3> cube_vertices =
	{ { -1.0, -1.0, 1.0},
	{ 1.0, -1.0, 1.0},
	{ 1.0, 1.0, 1.0},
	{ -1.0, 1.0, 1.0},		
	{ -1.0, -1.0, -1.0},
	{ 1.0, -1.0, -1.0},
	{ 1.0, 1.0, -1.0},
	{ -1.0, 1.0, -1.0} };

	GLfloat cube_colors[] = {
		// front colors
		1.0, 0.0, 0.0,
		0.0, 1.0, 0.0,
		0.0, 0.0, 1.0,
		1.0, 1.0, 1.0,
		// back colors
		1.0, 0.0, 0.0,
		0.0, 1.0, 0.0,
		0.0, 0.0, 1.0,
		1.0, 1.0, 1.0,
	};

	GLushort cube_elements[] = {
		0, 1, 2,		2, 3, 0,		1, 5, 6,
		6, 2, 1,		7, 6, 5,		5, 4, 7,
		4, 0, 3,		3, 7, 4,		4, 5, 1,
		1, 0, 4,		3, 2, 6,		6, 7, 3,
	};
	

	glGenVertexArrays(1, &_vaoHandle);
	glBindVertexArray(_vaoHandle);

	glGenBuffers(1, &_vbo_vertices);
	glBindBuffer(GL_ARRAY_BUFFER, _vbo_vertices);
	glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * cube_vertices.size() * 3, cube_vertices.data(), GL_STATIC_DRAW);

	glVertexAttribPointer(
		0,   //attr number = 0
		3,
		GL_FLOAT, 
		GL_FALSE,
		0,
		(void*)0);
	glEnableVertexAttribArray(0);  //attr number = 0


	glGenBuffers(1, &_vbo_colors);
	glBindBuffer(GL_ARRAY_BUFFER, _vbo_colors);
	glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 24, cube_colors, GL_STATIC_DRAW);

	glVertexAttribPointer(
		1,
		3,
		GL_FLOAT,
		GL_FALSE,
		0,
		(void*)0);
	glEnableVertexAttribArray(1);

	glGenBuffers(1, &_iboHandle);
	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _iboHandle);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(cube_elements), cube_elements, GL_STATIC_DRAW);

	glBindVertexArray(0);
}

ColorCube::ColorCube()
{
	setup();
}


void ColorCube::draw(ShaderProgram *shader, glm::mat4x4 pv)
{				
	_model.glPushMatrix();
	effectTransformations();
	glBindVertexArray(_vaoHandle);
	int size;
	glGetBufferParameteriv(GL_ELEMENT_ARRAY_BUFFER, GL_BUFFER_SIZE, &size);
	glm::mat4 mvpMatrix = pv * _model.getMatrix();
	glUniformMatrix4fv(shader->uniform("mvp"), 1, GL_FALSE, glm::value_ptr(mvpMatrix));
	glDrawElements(GL_TRIANGLES, size / sizeof(GLushort), GL_UNSIGNED_SHORT, 0);

	_model.glPopMatrix();

}

DrawableType ColorCube::getType()
{
	return DrawableType::COLOR_CUBE;
}

ColorCube::~ColorCube()
{
}