#include <stdio.h>
#include <unistd.h>
#include <sys/timerfd.h>

#include "nfcommander.h"
#include "config.h"

#include "libyhy.h"

static int reader_fd = -1;
static int timer_fd = -1;

int init(){
	char reader_version[100];
	size_t poll_timeout = 1000;
	struct itimerspec timer_cfg = {
		0
	};

	if(config_get("nfc", "interval")){
		poll_timeout = strtoul(config_get("nfc", "interval"), NULL, 10);
	}

	timer_cfg.it_value.tv_sec = timer_cfg.it_interval.tv_sec = poll_timeout / 1000;
	timer_cfg.it_value.tv_nsec = timer_cfg.it_interval.tv_nsec = (poll_timeout % 1000) * 1e6;

	char* port = config_get("nfc", "device");
	if(!port){
		printf("Please configure nfc.device to the reader serial port\n");
		return 1;
	}

	//TODO set cloexec, nonblock
	printf("Opening %s with polltime %lu\n", port, poll_timeout);
	reader_fd = yhy_open(port);
	if(reader_fd < 0){
		printf("Failed to open reader connection at %s\n", port);
		return 1;
	}

	if(yhy_sync_read_version(reader_fd, reader_version, sizeof(reader_version)) > 0){
		printf("Connected YHY reader reports firmware: %s\n", reader_version);
	}

	//create timerfd
	timer_fd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
	if(timer_fd < 0){
		printf("Failed to create timer fd\n");
		return 1;
	}

	if(timerfd_settime(timer_fd, 0, &timer_cfg, NULL)){
		printf("Failed to set timer\n");
		return 1;
	}

	core_manage_fd(reader_fd, 1, system_reader);
	core_manage_fd(timer_fd, 1, system_reader);

	return 0;
}

int handle(int fd){
	uint8_t buffer[1024];

	if(fd == timer_fd){
		//acknowledge the timer
		read(fd, buffer, sizeof(buffer));

		//see if there is a tag
		//TODO
		return 0;
	}

	printf("Unknown FD in reader_yhy handler\n");
	return 1;
}

static void __attribute__((destructor)) cleanup(){
	core_manage_fd(reader_fd, 0, system_reader);
	close(reader_fd);
	reader_fd = -1;
	core_manage_fd(timer_fd, 0, system_reader);
	close(timer_fd);
	timer_fd = -1;
}