/**
 * \defgroup unixsimulator Simulation of the Borg API for UNIX like platforms.
 */
/*@{*/

/**
 * @file main.c
 * @brief Simulator for Unix like platforms.
 * @author Martin Ongsiek, Peter Fuhrmann, Christian Kroll
 */

#ifdef OSX_
	#include <GLUT/glut.h>
#else
	#include <GL/glut.h>
#endif
#include <pthread.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#include <stdio.h>
#include <setjmp.h>

#include "../config.h"
#include "../display_loop.h"
#include "trackball.h"

/** Number of bytes per row. */
#define LINEBYTES (((NUM_COLS - 1) / 8) + 1)

/** Fake port for simulating joystick input. */
volatile unsigned char fakeport;
/** Flag which indicates if wait should jump to the menu if fire is pressed. */
volatile unsigned char waitForFire;
/** The simulated frame buffer of the borg. */
volatile unsigned char pixmap[NUMPLANE][NUM_ROWS][LINEBYTES];
/** Jump buffer which leads directly the menu. */
extern jmp_buf newmode_jmpbuf;

/** Width of the window. */
int WindWidth;
/** Height of the window. */
int WindHeight;

/** Rotation of the x-axis of the scene. */
float view_rotx = 0;
/** Rotation of the y-axis of the scene. */
float view_roty = 0;
/** Rotation of the z-axis of the scene. */
float view_rotz = 0;

/** GLUT window handle. */
int win;


/**
 * Simple wait function.
 * @param ms The requested delay in milliseconds.
 */
void wait(unsigned int ms) {
	if (waitForFire) {
		if (fakeport & 0x01) {
			longjmp(newmode_jmpbuf, 0xFEu);
		}
	}

	usleep(ms * 1000);
}


/**
 * Draw a LED in the given color (which is a list).
 * @param color List which contains a sphere.
 * @param pos_x x-coordinate
 * @param pos_y y-coordinate
 * @param pos_z z-coordinate
 */
void drawLED(int color, float pos_x, float pos_y, float pos_z) {
	glPushMatrix();
	glTranslatef(pos_x, pos_y, pos_z);
	glCallList(color);
	glPopMatrix();
}


/**
 * Draws the LED matrix.
 */
void display(void) {
	int x, y, z, level, color;
	tbReshape(WindWidth, WindHeight);
	glClear(GL_COLOR_BUFFER_BIT);
	glPushMatrix();
	glTranslatef(NUM_COLS * 2., 0., NUM_ROWS * 2.);
	tbMatrix();
	glRotatef(view_rotx, 1.0, 0.0, 0.0);
	glRotatef(view_roty, 0.0, 1.0, 0.0);
	glRotatef(view_rotz, 0.0, 0.0, 1.0);
	glTranslatef(-NUM_COLS * 2, 0., -NUM_ROWS * 2.);
	for (x = 0; x < 1; x++) {
		for (y = 0; y < NUM_COLS; y++) {
			for (z = 0; z < NUM_ROWS; z++) {
				color = 0;
				for (level = 0; level < NUMPLANE; level++) {
					if (pixmap[level][z % NUM_ROWS][y / 8] & (1 << y % 8)) {
						color = level + 1;
					}
				}
				drawLED(color, (float) y * 4.0, (float) x * 4.0,
						(float) (NUM_ROWS - 1 - z) * 4.0);
			}
		}
	}
	glPopMatrix();
	glutSwapBuffers();

	usleep(20000);
}


/**
 * Handler for processing key presses.
 * @param key The pressed key encoded in ASCII.
 * @param x X-position of the mouse pointer.
 * @param y Y-position of the mouse pointer.
 */
void keyboard(unsigned char key, int x, int y) {
	switch (key) {
	case 'q':
		printf("Quit\n");
		glutDestroyWindow(win);
		exit(0);
		break;
	case ' ':
		fakeport |= 0x01;
		break;
	case 'a':
		fakeport |= 0x02;
		break;
	case 'd':
		fakeport |= 0x04;
		break;
	case 's':
		fakeport |= 0x08;
		break;
	case 'w':
		fakeport |= 0x10;
		break;
	}
}


/**
 * Handler for processing key releases.
 * @param key The released key encoded in ASCII.
 * @param x X-position of the mouse pointer.
 * @param y Y-position of the mouse pointer.
 */
void keyboardup(unsigned char key, int x, int y) {
	switch (key) {
	case ' ':
		fakeport &= ~0x01;
		break;
	case 'a':
		fakeport &= ~0x02;
		break;
	case 'd':
		fakeport &= ~0x04;
		break;
	case 's':
		fakeport &= ~0x08;
		break;
	case 'w':
		fakeport &= ~0x10;
		break;
	}
}


/**
 * Relays mouse position and button state to the trackball implementation.
 * @param button Currently monitored button.
 * @param state State of that button.
 * @param x X-position of the mouse pointer.
 * @param y Y-position of the mouse pointer.
 */
void mouse(int button, int state, int x, int y) {
	tbMouse(button, state, x, y);
}


/**
 * Relays motion request to the trackball implementation.
 * @param x X-position for the motion direction.
 * @param y Y-position for the motion direction.
 */
void motion(int x, int y) {
	tbMotion(x, y);
}

/**
 * Updating the window size.
 * @param width Width of the window.
 * @param height Height of the window.
 */
void reshape(int width, int height) {

	tbReshape(width, height);

	glViewport(0, 0, width, height);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(60.0, (float) WindWidth / (float) WindWidth, 5., 1000.);
	gluLookAt(NUM_ROWS * 2., NUM_ROWS * 2. + 50., NUM_COLS * 2., NUM_ROWS * 2.,
			NUM_ROWS * 2., NUM_COLS * 2., 0.0, 0.0, 1.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	WindWidth = width;
	WindHeight = height;
}


/**
 * Handler for special keys (the arrow keys in particular) for adjusting the
 * view angle of the scene.
 * @param k The pressed special key using GLUT's nomenclature.
 * @param x X-position of the mouse pointer.
 * @param y Y-position of the mouse pointer.
 */
static void special(int k, int x, int y) {
	switch (k) {
	case GLUT_KEY_UP:
		view_rotx += 5.0;
		break;
	case GLUT_KEY_DOWN:
		view_rotx -= 5.0;
		break;
	case GLUT_KEY_LEFT:
		view_rotz += 5.0;
		break;
	case GLUT_KEY_RIGHT:
		view_rotz -= 5.0;
		break;
	default:
		return;
	}
	glutPostRedisplay();
}


/**
 * Entry point for starting the display loop thread.
 * @param unused Not used. Only here to satisfy signature constraints.
 */
void *display_loop_run(void * unused) {
	display_loop();
	return 0;
}


/**
 * Main function for the simulator.
 * @param argc The argument count.
 * @param argv Command line arguments.
 * @return Exit codem, always zero.
 */
int main(int argc, char **argv) {
	WindHeight = 700;
	WindWidth = 700;
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
	glutInitWindowSize(WindHeight, WindWidth);
	win = glutCreateWindow("16x16 Borg Simulator");

	// callback
	glutDisplayFunc(display);
	glutIdleFunc(display);
	glutSetKeyRepeat(GLUT_KEY_REPEAT_OFF);
	glutKeyboardFunc(keyboard);
	glutKeyboardUpFunc(keyboardup);
	glutSpecialFunc(special);
	glutMouseFunc(mouse);
	glutMotionFunc(motion);

	// clearcolor & main loop
	glClearColor(0, 0, 0, 1.0);
	gluPerspective(60.0, (float) WindWidth / (float) WindWidth, 5., 1000.);
	gluLookAt(NUM_COLS * 2., NUM_COLS * 2. + 50., NUM_ROWS * 2., NUM_COLS * 2.,
			NUM_COLS * 2., NUM_ROWS * 2., 0.0, 0.0, 1.0);

	// init Call List for LED
	GLUquadric* quad = gluNewQuadric();
	glNewList(0, GL_COMPILE);
		glColor4f(0.8, 0.0, 0.0, 1.);
		gluSphere(quad, 1.0, 12, 12);
	glEndList();
	glNewList(1, GL_COMPILE);
		glColor4f(0.5, 0.0, 0.0, 1.);
		gluSphere(quad, 1.4, 12, 12);
	glEndList();
	glNewList(2, GL_COMPILE);
		glColor4f(0.7, 0.0, 0.0, 1.);
		gluSphere(quad, 1.55, 12, 12);
	glEndList();
	glNewList(3, GL_COMPILE);
		glColor4f(1.00, 0.0, 0.0, 1.);
		gluSphere(quad, 1.7, 12, 12);
	glEndList();

	tbInit(GLUT_LEFT_BUTTON);
	tbAnimate(GL_FALSE);

	pthread_t simthread;
	pthread_create(&simthread, NULL, display_loop_run, NULL);

	glutMainLoop();
	return 0;
}

/*@}*/