#include "BasicScene.h"

#include "stdafx.h"

#include "GLUtil.h"
#include "MeshFactory.h"

namespace charcoal
{
	namespace builtin
	{
		BasicScene::BasicScene(Application& application)
			: Scene(application),
			m_shape(MeshFactory<BasicVertex, BasicIndex>::gen(
				DrawMode::DRAW_TRIANGLES,
				BasicVertex({ -50.0f, 50.0f, 0.0f }),
				BasicVertex({ 50.0f, 150.0f, 0.0f }),
				BasicVertex({ -100.0f, -50.0f, 0.0f }),
				BasicVertex({ 100.0f, -50.0f, 0.0f })
			), DrawMode::DRAW_TRIANGLES),
			m_batch(&m_shape, 2),
			m_camera(m_screen_size)
		{}

		BasicScene::~BasicScene() {}

		void BasicScene::init()
		{
			sizeof(BasicVertex);
			sizeof(vec3);
			m_batch.init();
		}

		void BasicScene::use()
		{
			// TODO: move to glutil
			glEnable(GL_DEPTH_TEST);
			glDepthFunc(GL_LESS);
		}

		void BasicScene::unuse()
		{

		}

		void BasicScene::update(float delta_time, clock_t clock)
		{
			float brightness;
			float radians;

			clock_t c;
			const clock_t intervals = 512 * CLOCKS_PER_SEC / 100;
			const clock_t half_interval = 256 * CLOCKS_PER_SEC / 100;
			c = clock % intervals;
			if (c < half_interval)
				brightness = (float)c / half_interval;
			else
				brightness = (float)(intervals - c) / half_interval;

			radians = (float)TAU * c / intervals;

			{
				Poseable& pose = m_batch.get_pose(0);
				pose.update_position(vec3(cos(radians) * 50, 0.0f, 0.0f));
			}

			{
				Poseable& pose = m_batch.get_pose(1);
				pose.update_position(vec3(0.0f, sin(radians) * 50, 0.0f));
			}

			vec2 camera_translation(0.0f, 0.0f);

			if (m_input_manager.is_key_down(GLFW_KEY_W)) camera_translation.y += 1;
			if (m_input_manager.is_key_down(GLFW_KEY_S)) camera_translation.y -= 1;
			if (m_input_manager.is_key_down(GLFW_KEY_A)) camera_translation.x -= 1;
			if (m_input_manager.is_key_down(GLFW_KEY_D)) camera_translation.x += 1;

			m_camera.translate(camera_translation * delta_time * 100.0f);
		}

		void BasicScene::prerender()
		{
			m_camera.prerender();
			m_batch.prerender();
		}

		void BasicScene::render()
		{
			// TODO: This is not rendering :(
			glutil::clear_screen();
			m_shader_program.use();
			glutil::uniform_matrix(0, m_camera.get_world_to_view_matrix());
			m_batch.render();
		}
	}
}