#ifdef _WIN32
#include <windows.h>
#endif

#include <util/platform.h>
#include "vlc-video-plugin.h"

OBS_DECLARE_MODULE()
OBS_MODULE_USE_DEFAULT_LOCALE("vlc-video", "en-US")

/* libvlc core */
LIBVLC_NEW libvlc_new_;
LIBVLC_RELEASE libvlc_release_;
LIBVLC_CLOCK libvlc_clock_;
LIBVLC_EVENT_ATTACH libvlc_event_attach_;

/* libvlc media */
LIBVLC_MEDIA_NEW_PATH libvlc_media_new_path_;
LIBVLC_MEDIA_RELEASE libvlc_media_release_;
LIBVLC_MEDIA_RELEASE libvlc_media_retain_;

/* libvlc media player */
LIBVLC_MEDIA_PLAYER_NEW libvlc_media_player_new_;
LIBVLC_MEDIA_PLAYER_NEW_FROM_MEDIA libvlc_media_player_new_from_media_;
LIBVLC_MEDIA_PLAYER_RELEASE libvlc_media_player_release_;
LIBVLC_VIDEO_SET_CALLBACKS libvlc_video_set_callbacks_;
LIBVLC_VIDEO_SET_FORMAT_CALLBACKS libvlc_video_set_format_callbacks_;
LIBVLC_AUDIO_SET_CALLBACKS libvlc_audio_set_callbacks_;
LIBVLC_AUDIO_SET_FORMAT_CALLBACKS libvlc_audio_set_format_callbacks_;
LIBVLC_MEDIA_PLAYER_PLAY libvlc_media_player_play_;
LIBVLC_MEDIA_PLAYER_STOP libvlc_media_player_stop_;
LIBVLC_MEDIA_PLAYER_GET_TIME libvlc_media_player_get_time_;
LIBVLC_VIDEO_GET_SIZE libvlc_video_get_size_;
LIBVLC_MEDIA_PLAYER_EVENT_MANAGER libvlc_media_player_event_manager_;

/* libvlc media list */
LIBVLC_MEDIA_LIST_NEW libvlc_media_list_new_;
LIBVLC_MEDIA_LIST_RELEASE libvlc_media_list_release_;
LIBVLC_MEDIA_LIST_ADD_MEDIA libvlc_media_list_add_media_;
LIBVLC_MEDIA_LIST_LOCK libvlc_media_list_lock_;
LIBVLC_MEDIA_LIST_UNLOCK libvlc_media_list_unlock_;
LIBVLC_MEDIA_LIST_EVENT_MANAGER libvlc_media_list_event_manager_;

/* libvlc media list player */
LIBVLC_MEDIA_LIST_PLAYER_NEW libvlc_media_list_player_new_;
LIBVLC_MEDIA_LIST_PLAYER_RELEASE libvlc_media_list_player_release_;
LIBVLC_MEDIA_LIST_PLAYER_PLAY libvlc_media_list_player_play_;
LIBVLC_MEDIA_LIST_PLAYER_PAUSE libvlc_media_list_player_pause_;
LIBVLC_MEDIA_LIST_PLAYER_STOP libvlc_media_list_player_stop_;
LIBVLC_MEDIA_LIST_PLAYER_SET_MEDIA_PLAYER libvlc_media_list_player_set_media_player_;
LIBVLC_MEDIA_LIST_PLAYER_SET_MEDIA_LIST libvlc_media_list_player_set_media_list_;
LIBVLC_MEDIA_LIST_PLAYER_EVENT_MANAGER libvlc_media_list_player_event_manager_;
LIBVLC_MEDIA_LIST_PLAYER_SET_PLAYBACK_MODE libvlc_media_list_player_set_playback_mode_;

void *libvlc_module = NULL;
libvlc_instance_t *libvlc = NULL;
uint64_t time_start = 0;

static bool load_vlc_funcs(void)
{
#define LOAD_VLC_FUNC(func) \
	do { \
		func ## _ = os_dlsym(libvlc_module, #func); \
		if (!func ## _) { \
			blog(LOG_WARNING, "Could not func VLC function %s, " \
					"VLC loading failed", #func); \
			return false; \
		} \
	} while (false)

	/* libvlc core */
	LOAD_VLC_FUNC(libvlc_new);
	LOAD_VLC_FUNC(libvlc_release);
	LOAD_VLC_FUNC(libvlc_clock);
	LOAD_VLC_FUNC(libvlc_event_attach);

	/* libvlc media */
	LOAD_VLC_FUNC(libvlc_media_new_path);
	LOAD_VLC_FUNC(libvlc_media_release);
	LOAD_VLC_FUNC(libvlc_media_retain);

	/* libvlc media player */
	LOAD_VLC_FUNC(libvlc_media_player_new);
	LOAD_VLC_FUNC(libvlc_media_player_new_from_media);
	LOAD_VLC_FUNC(libvlc_media_player_release);
	LOAD_VLC_FUNC(libvlc_video_set_callbacks);
	LOAD_VLC_FUNC(libvlc_video_set_format_callbacks);
	LOAD_VLC_FUNC(libvlc_audio_set_callbacks);
	LOAD_VLC_FUNC(libvlc_audio_set_format_callbacks);
	LOAD_VLC_FUNC(libvlc_media_player_play);
	LOAD_VLC_FUNC(libvlc_media_player_stop);
	LOAD_VLC_FUNC(libvlc_media_player_get_time);
	LOAD_VLC_FUNC(libvlc_video_get_size);
	LOAD_VLC_FUNC(libvlc_media_player_event_manager);

	/* libvlc media list */
	LOAD_VLC_FUNC(libvlc_media_list_new);
	LOAD_VLC_FUNC(libvlc_media_list_release);
	LOAD_VLC_FUNC(libvlc_media_list_add_media);
	LOAD_VLC_FUNC(libvlc_media_list_lock);
	LOAD_VLC_FUNC(libvlc_media_list_unlock);
	LOAD_VLC_FUNC(libvlc_media_list_event_manager);

	/* libvlc media list player */
	LOAD_VLC_FUNC(libvlc_media_list_player_new);
	LOAD_VLC_FUNC(libvlc_media_list_player_release);
	LOAD_VLC_FUNC(libvlc_media_list_player_play);
	LOAD_VLC_FUNC(libvlc_media_list_player_pause);
	LOAD_VLC_FUNC(libvlc_media_list_player_stop);
	LOAD_VLC_FUNC(libvlc_media_list_player_set_media_player);
	LOAD_VLC_FUNC(libvlc_media_list_player_set_media_list);
	LOAD_VLC_FUNC(libvlc_media_list_player_event_manager);
	LOAD_VLC_FUNC(libvlc_media_list_player_set_playback_mode);
	return true;
}

static bool load_libvlc_module(void)
{
#ifdef _WIN32
	char    *path_utf8 = NULL;
	wchar_t path[1024];
	LSTATUS status;
	DWORD   size;
	HKEY    key;

	memset(path, 0, 1024 * sizeof(wchar_t));

	status = RegOpenKeyW(HKEY_LOCAL_MACHINE,
			L"SOFTWARE\\VideoLAN\\VLC",
			&key);
	if (status != ERROR_SUCCESS)
		return false;

	size = 1024;
	status = RegQueryValueExW(key, L"InstallDir", NULL, NULL,
			(LPBYTE)path, &size);
	if (status == ERROR_SUCCESS) {
		wcscat(path, L"\\libvlc.dll");
		os_wcs_to_utf8_ptr(path, 0, &path_utf8);
		libvlc_module = os_dlopen(path_utf8);
		bfree(path_utf8);
	}

	RegCloseKey(key);
#else

#ifdef __APPLE__
#define LIBVLC_DIR "/Applications/VLC.app/Contents/MacOS/"
#define LIBVLC_FILE LIBVLC_DIR "lib/libvlc.5.dylib"
	setenv("VLC_PLUGIN_PATH", LIBVLC_DIR "plugins", false);
#else
#define LIBVLC_FILE "libvlc.so.5"
#endif
	libvlc_module = os_dlopen(LIBVLC_FILE);

#endif

	return libvlc_module != NULL;
}

extern struct obs_source_info vlc_source_info;

bool load_libvlc(void)
{
	if (libvlc)
		return true;

	libvlc = libvlc_new_(0, 0);
	if (!libvlc) {
		blog(LOG_INFO, "Couldn't create libvlc instance");
		return false;
	}

	time_start = (uint64_t)libvlc_clock_() * 1000ULL;
	return true;
}

bool obs_module_load(void)
{
	if (!load_libvlc_module()) {
		blog(LOG_INFO, "Couldn't find VLC installation, VLC video "
				"source disabled");
		return true;
	}

	if (!load_vlc_funcs())
		return true;

	blog(LOG_INFO, "VLC found, VLC video source enabled");

	obs_register_source(&vlc_source_info);
	return true;
}

void obs_module_unload(void)
{
	if (libvlc)
		libvlc_release_(libvlc);
	if (libvlc_module)
		os_dlclose(libvlc_module);
}