/**
 * Spacenav Demo Qt
 * Copyright © 2018 František Kučera (Frantovo.cz, GlobalCode.info)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once

#include <iostream>
#include <QObject>
#include <QThread>
#include <spnav.h>

Q_DECLARE_METATYPE(spnav_event)

class SpacenavReceiver : public QThread {

	Q_OBJECT
public:


	SpacenavReceiver() : QThread() {
	}

	virtual ~SpacenavReceiver() {
		std::wcout << L"calling spnav_close() in ~SpacenavReceiver()" << std::endl;
		spnav_close();
	}

	void run() {
		Display* display;
		Window window;
		unsigned long blackPixel;

		spnav_event event;

		if (!(display = XOpenDisplay(0))) {
			std::wcout << L"unable to connect to the X server" << std::endl;
			return; // TODO: throw exception
		}

		blackPixel = BlackPixel(display, DefaultScreen(display));
		window = XCreateSimpleWindow(display, DefaultRootWindow(display), 0, 0, 1, 1, 0, blackPixel, blackPixel);

		if (spnav_x11_open(display, window) == -1) {
			std::wcout << L"unable to connect to the space navigator daemon" << std::endl;
			return; // TODO: throw exception

			/**
			 * TODO: try also unix socket
			 * 
			 * 	if(spnav_open()==-1) {
			 * 	  	fprintf(stderr, "failed to connect to the space navigator daemon\n");
			 * 		return 1;
			 * 	}
			 */
		}

		// For stopping this thread by pressing both buttons:
		bool pressed0 = false;
		bool pressed1 = false;

		while (spnav_wait_event(&event)) {
			if (event.type == SPNAV_EVENT_MOTION) {
				std::wcout << L"motion event: t(" << event.motion.x << L", " << event.motion.y << L", " << event.motion.z << L") ";
				std::wcout << L"r(" << event.motion.rx << L", " << event.motion.ry << L", " << event.motion.rz << L")" << std::endl;

			} else { /* SPNAV_EVENT_BUTTON */
				std::wcout << L"button " << (event.button.press ? "press" : "release") << L" event b(" << event.button.bnum << L")" << std::endl;

				if (event.button.bnum == 0) pressed0 = event.button.press;
				if (event.button.bnum == 1) pressed1 = event.button.press;
				if (pressed0 && pressed1) {
					std::wcout << L"both buttons pressed → stop receiving events" << std::endl;
					break;
				}
			}
			emit spacenavEvent(event);
		}

	}

signals:
	void spacenavEvent(spnav_event sev);
};