#include <kos.h>
#include <stdio.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glkos.h>
#include <sys/time.h>

float angle = 0;
float deltaTime = 1.0/60.0;
const float microSecond = 0.000001f; 
float speed = 5.0f;

void initScreen() {
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
}

void displayStuff() {
	glClear(GL_COLOR_BUFFER_BIT);

	glPushMatrix();
	glRotatef(angle, 0, 0, 1);
	glColor3f(1.0f, 1.0f, 1.0f);
	glBegin(GL_POLYGON);
		glVertex3f(0.25f, 0.25f, 0.0f);
		glVertex3f(0.75f, 0.25f, 0.0f);
		glVertex3f(0.75f, 0.75f, 0.0f);
		glVertex3f(0.25f, 0.75f, 0.0f);
	glEnd();
	glPopMatrix();

	// glFlush();
	glKosSwapBuffers();
}

void process_input() {
	maple_device_t *controller;
	cont_state_t *controller_state;

	controller = maple_enum_type(0, MAPLE_FUNC_CONTROLLER);

	if (controller) {
		controller_state = (cont_state_t *)maple_dev_status(controller);

		if (!controller_state) {
			printf("An error has occured while trying to read the controller.\n");
		}

		if (controller_state->buttons & CONT_DPAD_RIGHT) {
			speed += 1.0f;
		} else if (controller_state->buttons & CONT_DPAD_LEFT) {
			speed -= 1.0f;
		}

		if (speed < 1.0f) {
			speed = 1.0f;
		}

		angle += (controller_state->joyx / 127.0f) * deltaTime * speed;
	}
}

int main() {
	glKosInit();
	initScreen();
	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));
	struct timeval beginningOfFrame, endOfFrame;

	while (1) {
		gettimeofday(&beginningOfFrame, 0);
		process_input();
		displayStuff();
		gettimeofday(&endOfFrame, 0);
		float time = ((float)(endOfFrame.tv_usec) * microSecond) - ((float)(beginningOfFrame.tv_usec) * microSecond);
		if (time > 0.0f) {
			deltaTime = time;
		}
	}
}