#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libusb.h>
#include "config.h"
#include "logger.h"

static char* on_docked;
static char* on_undocked;

int hotplug_callback(struct libusb_context *ctx, struct libusb_device *dev,
					 libusb_hotplug_event event, void *user_data) {
	static libusb_device_handle *dev_handle = NULL;
	struct libusb_device_descriptor desc;

	(void)libusb_get_device_descriptor(dev, &desc);

	LOG(LOG_DEBUG, "device: 0x%04x 0x%04x\n", desc.idVendor, desc.idProduct);

	if (desc.idVendor == DOCK_VENDOR && desc.idProduct == DOCK_PRODUCT) {
		if (event == LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED) {
			if (fork() == 0) {
				execl(ON_DOCKED, ON_DOCKED, NULL);
			}
			LOG(LOG_DEBUG, "docked\n");
		} else {
			if (fork() == 0) {
				execl(ON_UNDOCKED, ON_UNDOCKED, NULL);
			}
			LOG(LOG_DEBUG, "undocked\n");
		}
	} else {
		LOG(LOG_DEBUG, "not dock\n");
	}

	return 0;
}

int main(int argc, char* argv[]) {
	libusb_hotplug_callback_handle callback_handle;
	int rc;

	LOG(LOG_INFO, "starting dockd...\n");

	libusb_init_context(NULL, NULL, 0);

	LOG(LOG_DEBUG, "init'd libusb context.\n");

	rc = libusb_hotplug_register_callback(NULL,
										  LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED |
										  LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT, 0,
										  LIBUSB_HOTPLUG_MATCH_ANY,
										  LIBUSB_HOTPLUG_MATCH_ANY,
										  LIBUSB_HOTPLUG_MATCH_ANY,
										  hotplug_callback, NULL,
										  &callback_handle);

	if (rc != LIBUSB_SUCCESS) {
		LOG(LOG_ERROR, "failed to register libusb callback.\n");
		exit(rc);
	} else {
		LOG(LOG_DEBUG, "registered libusb hotplub callback.\n");
	}

	LOG(LOG_DEBUG, "beginning event loop...\n");

	while (1) {
		libusb_handle_events_completed(NULL, NULL);
		nanosleep(&(struct timespec){0, 10000000UL}, NULL);
	}
}