//This file is main.C (C++ example).

#include <iostream>
#include <cstdlib>
#include <cctype>	//for toupper
extern "C" {
#include "term3d.h"	//the above file
}
using namespace std;

int main()
{
	struct keystroke {
		char c;
		int dx;   //horizontal offset
		int dy;   //vertical offset
		int dz;   //front to back offset
	};

	static const keystroke k[] = {
		{'h',	-1,	 0,	 0},   //left
		{'j',	 0,	 1,	 0},   //down
		{'k',	 0,	-1,	 0},   //up
		{'l',	 1,	 0,	 0},   //right

		{'f',	 0,	 0,	-1},   //forward
		{'b',	 0,	 0,	 1}    //backward
	};
	static const size_t n = sizeof k / sizeof k[0];

	term3d_construct("192.168.20.195", 9265);
	const unsigned xmax = term3d_xmax();
	const unsigned ymax = term3d_ymax();
	const unsigned zmax = term3d_zmax();

	term3d_puts(0, 0, 0,
		"type hjklfbq for left, down, up, right, front, back, quit.");

	//Capitalize the "t" in "type".
	const char c = term3d_get(0, 0, 0);
	term3d_put(0, 0, 0, toupper(c));

	for (unsigned x = xmax / 2, y = ymax / 2, z = zmax / 2;;) {
		term3d_put(x, y, z, 'X');

		char c;   //uninitialized variable
		while ((c = term3d_key()) == '\0') {
		}

		if (c == 'q') {
			break;
		}

		const keystroke *p;	//uninitialized variable
		for (p = k; p < k + n; ++p) {
			if (p->c == c) {
				goto found;
			}
		}

		term3d_beep();
		continue;

		found:;
		const unsigned newx = x + p->dx;
		const unsigned newy = y + p->dy;
		const unsigned newz = z + p->dz;

		if (0 <= newx && newx < xmax &&
			0 <= newy && newy < ymax &&
			0 <= newz && newz < zmax) {

			x = newx;
			y = newy;
			z = newz;
		} else {
			term3d_beep();
		}
	}

	done:;
	term3d_wait(1000);    //one full second
	term3d_beep();
	term3d_destruct();
	return EXIT_SUCCESS;
}