#define TINYOBJLOADER_IMPLEMENTATION

#include "engine.hh"

#include <GL/gl.h>
#include <GL/glkos.h>

#include <cstdio>
#include <functional>

void Engine::initScreen() {
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
	glViewport(0, 0, 640, 480);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glOrtho(0, 640, 0, 480, -100, 100);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
}

void Engine::printSystemInformation() {
	printf("GL_VENDOR: %s\n", glGetString(GL_VENDOR));
	printf("GL_RENDERER: %s\n", glGetString(GL_RENDERER));
	printf("GL_VERSION: %s\n", glGetString(GL_VERSION));
	printf("GL_EXTENSIONS: %s\n", glGetString(GL_EXTENSIONS));
}

void Engine::initializeEngine() {
	glKosInit();
	initScreen();
	printSystemInformation();
}

template <typename T>
void Engine::deltaTimeLoop(T&& callback, struct timeval& beginningOfFrame,
						   struct timeval& endOfFrame) {
	gettimeofday(&beginningOfFrame, 0);
	(this->*callback)();
	gettimeofday(&endOfFrame, 0);
	float time = ((float)(endOfFrame.tv_usec) * microSecond) -
				 ((float)(beginningOfFrame.tv_usec) * microSecond);
	if (time > 0.0f) {
		deltaTime = time;
	}
}

void Engine::initializeGameLoop() {
	struct timeval beginningOfFrame, endOfFrame;

	while (1) {
		deltaTimeLoop(&Engine::gameLoop, beginningOfFrame, endOfFrame);
	}
}

void Engine::pressButton(cont_state_t* controller_state, int button,
						 std::function<void()> callback) {
	if (controller_state->buttons & button) {
		if (!(buttonsPressed & button)) {
			buttonsPressed |= button;

			callback();
		}
	} else if ((buttonsPressed & button) &&
			   ~(controller_state->buttons & button)) {
		buttonsPressed &= ~button;
	}
}

void Engine::glVertex3fNormalized(float x, float y, float z) {
	constexpr int xSize = 640, ySize = 480;

	glVertex3f(x * xSize, y * ySize, z);
}