#include "LineSegment.h"
#define GLM_ENABLE_EXPERIMENTAL
#include "glm/gtx/string_cast.hpp"

void LineSegment::setup()
{
	std::vector<glm::vec3> seg_vertices =
	{ { .0, -1.0f, .0}, {.0, 1.0f, .0} };

	std::vector<glm::vec3> seg_colors =
	{ { 1.f, .0, .0}, {1.f, .0, .0} };

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

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

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

}

LineSegment::LineSegment()
{
	setup();
}

void LineSegment::draw(ShaderProgram *shader, glm::mat4x4 proj_matrix, glm::mat4x4 view_matrix)
{		
	_model.glPushMatrix();
	effectTransformations();
	glm::mat4 mvpMatrix = proj_matrix * view_matrix * _model.getMatrix();
	glUniformMatrix4fv(shader->uniform("mvp"), 1, GL_FALSE, glm::value_ptr(mvpMatrix));
	glLineWidth(4);
	glBindVertexArray(_vaoHandle);
	glDrawArrays(GL_LINES, 0, 2);
	_model.glPopMatrix();
}

DrawableType LineSegment::getType()
{
	return DrawableType::LINE_SEGMENT;
}

LineSegment::~LineSegment()
{
}