/*
*	LICENSE: WTFPL
*/

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <signal.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <linux/uinput.h>
#include <linux/input.h>

/* For signal handler */
int uinput_fd;
int event_fd;

void emit(int fd, int type, int code, int val) {
	struct input_event ie;

	ie.type = type;
	ie.code = code;
	ie.value = val;

	/* timestamp values below are ignored */
	ie.time.tv_sec = 0;
	ie.time.tv_usec = 0;

	write(fd, &ie, sizeof(ie));
}

void press(int fd) {
	puts("CLICK");
	for (int i = 0; i < 10; i++) {
		usleep(50000);

		emit(fd, EV_KEY, BTN_LEFT, 1);
		emit(fd, EV_SYN, SYN_REPORT, 0);
		emit(fd, EV_KEY, BTN_LEFT, 0);
		emit(fd, EV_SYN, SYN_REPORT, 0);
	}
}

void stop(int sig) {
	(void)sig;

	ioctl(uinput_fd, UI_DEV_DESTROY);
	close(uinput_fd);

	close(event_fd);
	puts("Stoping...");
	exit(0);
}

int main(int argc, char **argv) {
	signal(SIGTERM, stop);
	signal(SIGINT, stop);

	uinput_fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
	if (uinput_fd < 0) {
		fprintf(stderr, "autoclicker: /dev/uinput: %s\n", strerror(errno));
		return 1;
	}

	/* Keyboard events */
	event_fd = open("/dev/input/event1", O_RDONLY);
	if (event_fd < 0) {
		close(uinput_fd);

		fprintf(stderr, "autoclicker: /dev/input/eventX: %s\n", strerror(errno));
		return 1;
	}

	/* Setup uinput */
	ioctl(uinput_fd, UI_SET_EVBIT, EV_KEY);
	ioctl(uinput_fd, UI_SET_KEYBIT, BTN_LEFT);

	/* Setup struct */
	struct uinput_setup usetup;
	memset(&usetup, 0, sizeof(usetup));

	usetup.id.bustype = BUS_USB;
	usetup.id.vendor = 0x123;
	usetup.id.product = 0x123;
	snprintf(usetup.name, UINPUT_MAX_NAME_SIZE, "autoclicker");

	ioctl(uinput_fd, UI_DEV_SETUP, &usetup);
	ioctl(uinput_fd, UI_DEV_CREATE);

	/* Main */
	int flag = 0;
	struct input_event event;

	while (read(event_fd, &event, sizeof(event)) > 0) {
		printf("You cliekced: %d\n", event.code);
		if (event.code == 275 || event.code == 276)
			press(uinput_fd);
	}

	stop(0);
}