#include <test/jail.h>
#include <io/events.h>

struct callback_t : fs::event_callback_t
{
	callback_t (test::jail_t const& jail, bool log = false) : _jail(jail), _in_replay(false), _log(log) { }
	void set_replaying_history (bool flag, std::string const& observedPath, uint64_t eventId) { _in_replay = flag; }

	void did_change (std::string const& path, std::string const& observedPath, uint64_t eventId, bool recursive)
	{
		if(_log)
			fprintf(stderr, "\t%s, allowed %s, must see %s\n", path::relative_to(path, _jail.path()).c_str(), BSTR(_allowed.find(path) != _allowed.end()), BSTR(_must_see.find(path) != _must_see.end()));

		OAK_MASSERT(path::relative_to(path, _jail.path()).c_str(), _allowed.find(path) != _allowed.end());

		_must_see.erase(path);
		if(_must_see.empty())
			CFRunLoopStop(CFRunLoopGetCurrent());
	}

	void allowed (char const* firstPath, ...)
	{
		va_list ap;
		va_start(ap, firstPath);
		do {
			_allowed.insert(_jail.path(firstPath));
		} while(firstPath = va_arg(ap, char const*));
		va_end(ap);
	}

	void must_see (char const* firstPath, ...)
	{
		va_list ap;
		va_start(ap, firstPath);
		do {
			_must_see.insert(_jail.path(firstPath));
			_allowed.insert(_jail.path(firstPath));
		} while(firstPath = va_arg(ap, char const*));
		va_end(ap);
	}

	void event_loop (std::string const& observedPath)
	{
		if(_log)
		{
			fprintf(stderr, "observing ‘%s’\n", observedPath.c_str());
			for(auto const& path : _must_see)
				fprintf(stderr, "\tmust see: %s\n", path::relative_to(path, _jail.path()).c_str());
			fprintf(stderr, "starting event loop:\n");
		}

		while(!_must_see.empty())
		{
			if(CFRunLoopRunInMode(kCFRunLoopDefaultMode, 5, false) == kCFRunLoopRunTimedOut)
			{
				for(auto const& path : _must_see)
					fprintf(stderr, "*** waiting: %s\n", path::relative_to(path, _jail.path()).c_str());
			}
		}

		if(_log)
			fprintf(stderr, "seen it all\n\n");
	}

private:
	test::jail_t const& _jail;
	std::set<std::string> _must_see, _allowed;
	bool _in_replay, _log;
};

void test_simple ()
{
	test::jail_t jail;
	callback_t cb(jail/*, true*/);
	cb.must_see("foo/bar", "foo/bar/baz/fud", NULL);
	cb.allowed("", "foo", "foo/bar/baz", NULL);

	fs::watch(jail.path(), &cb, FSEventsGetCurrentEventId(), 0.1);
	jail.touch("foo/bar/baz/fud/dummy.txt");
	jail.touch("foo/bar/dummy.txt");
	cb.event_loop("");

	fs::unwatch(jail.path(), &cb);
}

void test_file_watch ()
{
	test::jail_t jail;
	callback_t cb(jail/*, true*/);
	cb.must_see("foo/bar/dummy.txt", NULL);

	jail.touch("foo/bar/dummy.txt");
	fs::watch(jail.path("foo/bar/dummy.txt"), &cb, FSEventsGetCurrentEventId(), 0.1);
	sleep(1);

	jail.touch("foo/dummy.txt");
	jail.touch("foo/bar/dummy.txt");
	jail.touch("foo/bar/other.txt");
	cb.event_loop("foo/bar/dummy.txt");

	fs::unwatch(jail.path("foo/bar/dummy.txt"), &cb);
}

void test_initially_missing ()
{
	test::jail_t jail;
	callback_t cb(jail/*, true*/);
	cb.must_see("foo/bar", "foo/bar/baz", "foo/bar/fud", NULL);

	fs::watch(jail.path("foo/bar"), &cb, FSEventsGetCurrentEventId(), 0.1);

	jail.mkdir("foo/bar/baz/fud");
	jail.touch("dummy.txt");     // should be ignored
	jail.touch("foo/dummy.txt"); // should be ignored
	jail.mkdir("foo/bar/fud/dummy.txt");
	cb.event_loop("foo/bar");

	jail.touch("dummy.txt");     // should be ignored
	jail.touch("foo/dummy.txt"); // should be ignored
	jail.touch("foo/bar/baz/fud/dummy.txt");
	cb.must_see("foo/bar/baz/fud", NULL);
	cb.event_loop("foo/bar");

	fs::unwatch(jail.path("foo/bar"), &cb);
}

void test_initially_missing_file ()
{
	test::jail_t jail;
	callback_t cb(jail/*, true*/);
	cb.must_see("foo/bar/dummy.txt", NULL);

	fs::watch(jail.path("foo/bar/dummy.txt"), &cb, FSEventsGetCurrentEventId(), 0.1);

	jail.mkdir("foo/bar/baz/fud");
	jail.touch("dummy.txt");
	jail.touch("foo/dummy.txt");
	jail.touch("foo/bar/other.txt");
	jail.touch("foo/bar/dummy.txt");
	cb.event_loop("foo/bar/dummy.txt");

	sleep(1);
	jail.touch("dummy.txt");
	jail.touch("foo/dummy.txt");
	jail.touch("foo/bar/other.txt");
	jail.touch("foo/bar/dummy.txt");
	cb.must_see("foo/bar/dummy.txt", NULL);
	cb.event_loop("foo/bar/dummy.txt");

	fs::unwatch(jail.path("foo/bar/dummy.txt"), &cb);
}
