#include <stdio.h>
#include <signal.h>
#include <sys/epoll.h>
#include <unistd.h>

#include "nfcommander.h"
#include "config.h"
#include "reader.h"
#include "control.h"

static volatile sig_atomic_t shutdown_requested = 0;
static int epoll_fd = -1;

static void signal_handler(int signum){
	shutdown_requested = 1;
}

static int usage(char* fn){
	printf("NFCommander %s - trigger actions based on near-field tags\n",
			NFCOMMANDER_VERSION);
	printf("\tUsage: %s <config-file>\n", fn);
	return EXIT_FAILURE;
}

int core_manage_fd(int fd, int manage, notification_target_t system){
	struct epoll_event event = {
		.events = EPOLLIN,
		.data.u32 = system
	};

	if(epoll_ctl(epoll_fd, manage ? EPOLL_CTL_ADD : EPOLL_CTL_DEL, fd, &event)){
		fprintf(stderr, "Failed to modify epoll instance\n");
		shutdown_requested = 1;
		return 1;
	}
	return 0;
}

int main(int argc, char** argv){
	if(argc < 2){
		return usage(argv[0]);
	}

	//set up epoll instance
	struct epoll_event events[10];
	epoll_fd = epoll_create1(EPOLL_CLOEXEC);
	if(epoll_fd < 0){
		printf("Failed to create epoll instance\n");
		return EXIT_FAILURE;
	}

	//read configuration
	if(config_read(argv[1])){
		return usage(argv[0]);
	}

	//start reader api
	reader_init();

	//start control api
	control_start();

	//handle signals
	signal(SIGINT, signal_handler);
	signal(SIGPIPE, SIG_IGN);

	//handle events
	while(!shutdown_requested){
		int event_count = epoll_wait(epoll_fd, events, sizeof(events) / sizeof(struct epoll_event), 1000);
		if(event_count < 0){
			break;
		}

		printf("%d events\n", event_count);
	}
	
	//clean up
	close(epoll_fd);
	epoll_fd = -1;
	reader_free();
	control_free();
	config_free();
}