#include "main.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <glib.h>
#include <unistd.h>
#include <signal.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include "log.h"
#include "epoll.h"
#include "inotify.h"
#include "metafile.h"
#include "garbage.h"



static GQueue threads = G_QUEUE_INIT; // only accessed from main thread

volatile int shutdown_flag;


static void signals(void) {
	sigset_t ss;

	sigfillset(&ss);
	sigdelset(&ss, SIGABRT);
	sigdelset(&ss, SIGSEGV);
	sigdelset(&ss, SIGQUIT);
	sigprocmask(SIG_SETMASK, &ss, NULL);
	pthread_sigmask(SIG_SETMASK, &ss, NULL);
}


static void setup(void) {
	av_register_all();
	avcodec_register_all();
	avformat_network_init();
	signals();
	metafile_setup();
	epoll_setup();
	inotify_setup();
}


static void start_poller_thread(void) {
	pthread_t *thr = g_slice_alloc(sizeof(*thr));
	int ret = pthread_create(thr, NULL, poller_thread,
			GUINT_TO_POINTER(garbage_new_thread_num()));
	if (ret)
		die_errno("pthread_create failed");

	g_queue_push_tail(&threads, thr);
}


static void wait_threads_finish(void) {
	pthread_t *thr;
	while ((thr = g_queue_pop_head(&threads))) {
		pthread_cancel(*thr);
		pthread_join(*thr, NULL);
		g_slice_free1(sizeof(*thr), thr);
	}
}


static void wait_for_signal(void) {
	sigset_t ss;
	int ret, sig;

	sigemptyset(&ss);
	sigaddset(&ss, SIGINT);
	sigaddset(&ss, SIGTERM);

	while (1) {
		ret = sigwait(&ss, &sig);
		if (ret == -1) {
			if (errno == EAGAIN || errno == EINTR)
				continue;
			abort();
		}
		shutdown_flag = 1;
		break;
	}
}


static void cleanup(void) {
	garbage_collect_all();
	metafile_cleanup();
	inotify_cleanup();
	epoll_cleanup();
}


int main() {
	setup();

	for (int i = 0; i < NUM_THREADS; i++)
		start_poller_thread();

	wait_for_signal();

	dbg("shutting down");

	wait_threads_finish();

	cleanup();
}