/*
   core/applicationinterface.cc
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#include "core/core.h"
#include "filesystem/filesystem.h"
#include "sys/sys.h"

#include <iostream>
#include <errno.h>
#include <signal.h>

namespace core {

// --------------- function repository ------------------------------
extern "C" void func_print(std::stringstream &args) {
	char text[MAXCMDSIZE];
	if(args.getline(text, MAXCMDSIZE))
		con_print << args << std::endl;
}

extern "C" void func_help(std::stringstream &args) {
	con_print << "This is the help function" << std::endl;
}

// --------------- signal_handler -----------------------------------
extern "C" void signal_handler(int signum)
{
	switch(signum){
		case SIGHUP:
		case SIGINT:
		case SIGQUIT:
		case SIGTERM:
			if (ApplicationInterface::instance()) {
				con_warn << "received signal " << signum << ", shutting down..." << std::endl;
				ApplicationInterface::instance()->shutdown();
				ApplicationInterface::instance()->quit(0);
			} else {
				std::cerr << "received signal " << signum << ", no application found, terminated..." << std::endl;
				sys::quit(1);
			}
			break;
		default:
			std::cerr << "received signal " << signum << ", terminated..." << std::endl;
			sys::quit(1);
			break;
	}
}

// --------------- ApplicationInterface -----------------------------

ApplicationInterface *ApplicationInterface::applicationinterface_instance = 0;

ApplicationInterface::ApplicationInterface() {
	if (applicationinterface_instance) {
		std::cerr << "multiple singleton instances: core::ApplicationInterface" << std::endl;
		sys::quit(2);
	}
	applicationinterface_instance = this;
	
	sys::signal(SIGHUP, signal_handler);
	sys::signal(SIGINT, signal_handler);
	sys::signal(SIGQUIT, signal_handler);
	sys::signal(SIGTERM, signal_handler);
}

ApplicationInterface::~ApplicationInterface()
{
	applicationinterface_instance = 0;
}

ApplicationInterface *ApplicationInterface::instance()
{
	return applicationinterface_instance;
}

void ApplicationInterface::init() 
{
        filesystem::init();

	con_debug << "Initializing core..." << std::endl;

	// register our functions
	func::add("print", func_print);
	func::add("help", func_help);

        if (game())
                game()->init();
        else
                con_warn << "No game module loaded!" << std::endl;

}

void ApplicationInterface::shutdown()
{
	con_debug << "Shutting down core..." << std::endl;

	if (game())
		game()->shutdown();
	else
		con_warn << "No game module loaded!" << std::endl;

	filesystem::shutdown();
}

void ApplicationInterface::quit(int status)
{
	sys::quit(status);
} 

void ApplicationInterface::frame(float seconds)
{
	if (game()) {
		game()->frame(seconds);
	}

	// execute commands in the buffer
	commandbuffer::execute();
}

}