#include "Debug.h"

#include <GLFW/glfw3.h>

#include <glm/ext.hpp>

void Debug::Render(DefaultUniform& uniform)
{
	RenderLines(uniform);

	_lines.clear();
}

void Debug::RenderLines(DefaultUniform& uniform) const
{
	glUseProgram(_shader);
	glBindVertexArray(_vba);
	glBindBuffer(GL_ARRAY_BUFFER, _vbo);

	int vertexCount = _lines.size() * 6;

	int viewportWidth, viewportHeight;
	glfwGetFramebufferSize(_window, &viewportWidth, &viewportHeight);

	glm::vec2 viewport = glm::vec2(viewportWidth, viewportHeight);



	glUniform2fv(_uniformViewportRes, 1, glm::value_ptr(viewport));
	glUniformMatrix4fv(_uniformModel, 1, GL_FALSE, glm::value_ptr(uniform.model));
	glUniformMatrix4fv(_uniformView, 1, GL_FALSE, glm::value_ptr(uniform.view));
	glUniformMatrix4fv(_uniformProjection, 1, GL_FALSE, glm::value_ptr(uniform.projection));



	DebugVertexData* data = new DebugVertexData[vertexCount];
	int index = 0;
	for(const auto& line : _lines) {
		int vertexIndex = index * 6;

		glm::vec3 quad[4] = {
			line.positionFirst,
			line.positionFirst,
			line.positionLast,
			line.positionLast
		};

		glm::vec3 direction = line.positionLast - line.positionFirst;

		data[ vertexIndex + 0 ] = DebugVertexData { quad[0], direction, line.color, line.lineWidth };
		data[ vertexIndex + 1 ] = DebugVertexData { quad[1], direction, line.color, line.lineWidth };
		data[ vertexIndex + 2 ] = DebugVertexData { quad[2], direction, line.color, line.lineWidth };
		data[ vertexIndex + 3 ] = DebugVertexData { quad[1], direction, line.color, line.lineWidth };
		data[ vertexIndex + 4 ] = DebugVertexData { quad[2], direction, line.color, line.lineWidth };
		data[ vertexIndex + 5 ] = DebugVertexData { quad[3], direction, line.color, line.lineWidth };

		index++;
	}

	glBufferData(GL_ARRAY_BUFFER, sizeof(DebugVertexData) * vertexCount, data, GL_STATIC_DRAW);
	glDrawArrays(GL_TRIANGLES, 0, vertexCount);

	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindVertexArray(0);
	glUseProgram(0);

	delete[] data;
}