/*
   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];
	// FIXME leading space
	if(args.getline(text, MAXCMDSIZE))
		con_print << text << std::endl;
}

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

extern "C" void func_quit(std::stringstream &args) {
	if(ApplicationInterface::instance()) {
		ApplicationInterface::instance()->shutdown();
		ApplicationInterface::instance()->quit(0);
	}
}

extern "C" void func_connect(std::stringstream &args) {
	if(ApplicationInterface::instance())
		ApplicationInterface::instance()->connect();
}

extern "C" void func_disconnect(std::stringstream &args) {
	if(ApplicationInterface::instance())
		ApplicationInterface::instance()->disconnect();
}

// --------------- 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() 
{
	con_print << "Initializing core..." << std::endl;
	con_debug << "Debug messages enabled" << std::endl;

	// initialize core subsystems
	filesystem::init();

	// register our functions
	func_register("print", func_print);
	func_register("help", func_help);
	func_register("quit", func_quit);

	func_register("connect", func_connect);
	func_register("disconnect", func_disconnect);

        if (game())
                game()->connected = false;
        else
                con_warn << "No game module loaded!" << std::endl;
	current_time = 0;
}

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

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

	filesystem::shutdown();
}

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

void ApplicationInterface::connect()
{
	if (!game()) {
		con_warn << "No game module loaded!" << std::endl;
		return;
	}
	
	if (game()->connected) {
		con_warn << "Connected. Disconnect first." << std::endl;
	}

	game()->current_time = 0;
	if (game()->connected = game()->init()) {
		con_print << "Connected." << std::endl;
	} else {
		con_warn << "Connect failed." << std::endl;
	}
}

void ApplicationInterface::disconnect()
{
	if (!game()) {
		con_warn << "No game module loaded!" << std::endl;
		return;
	}

	if (!game()->connected) {
		con_warn << "Not connected." << std::endl;
		return;
	}

	game()->shutdown();

	game()->connected = false;
	game()->current_time = 0;

	con_print << "Disconnected." << std::endl;
}

void ApplicationInterface::frame(float seconds)
{
	current_time += seconds;

	if (game() && game()->connected) {
		game()->current_time += seconds;
		game()->frame(seconds);
	}

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

}