/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*
 *  GThumb
 *
 *  Copyright (C) 2009 Free Software Foundation, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GTH_METADATA_PROVIDER_H
#define GTH_METADATA_PROVIDER_H

#include "gio-utils.h"
#include "gth-file-data.h"
#include "gth-metadata.h"
#include "typedefs.h"

G_BEGIN_DECLS

typedef enum {
	GTH_METADATA_WRITE_DEFAULT      = 0,
	GTH_METADATA_WRITE_NOT_MODIFIED = (1 << 0)
} GthMetadataWriteFlags;

#define GTH_TYPE_METADATA_PROVIDER (gth_metadata_provider_get_type ())
#define GTH_METADATA_PROVIDER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTH_TYPE_METADATA_PROVIDER, GthMetadataProvider))
#define GTH_METADATA_PROVIDER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTH_TYPE_METADATA_PROVIDER, GthMetadataProviderClass))
#define GTH_IS_METADATA_PROVIDER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTH_TYPE_METADATA_PROVIDER))
#define GTH_IS_METADATA_PROVIDER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTH_TYPE_METADATA_PROVIDER))
#define GTH_METADATA_PROVIDER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTH_TYPE_METADATA_PROVIDER, GthMetadataProviderClass))

typedef struct _GthMetadataProvider GthMetadataProvider;
typedef struct _GthMetadataProviderClass GthMetadataProviderClass;

struct _GthMetadataProvider {
	GObject parent_instance;
};

struct _GthMetadataProviderClass {
	GObjectClass parent_class;
	int       (*get_priority)       (GthMetadataProvider    *self);
	gboolean  (*can_read)		(GthMetadataProvider    *self,
					 GthFileData            *file_data,
					 const char             *mime_type,
					 char                  **attribute_v);
	gboolean  (*can_write)		(GthMetadataProvider    *self,
					 const char             *mime_type,
					 char                  **attribute_v);
	void      (*read)		(GthMetadataProvider    *self,
					 GthFileData            *file_data,
					 const char             *attributes,
					 GCancellable           *cancellable);
	void      (*write)		(GthMetadataProvider    *self,
					 GthMetadataWriteFlags   flags,
					 GthFileData            *file_data,
					 const char             *attributes,
					 GCancellable           *cancellable);
};

GType      gth_metadata_provider_get_type	(void);
gboolean   gth_metadata_provider_can_read	(GthMetadataProvider    *self,
						 GthFileData            *file_data,
						 const char             *mime_type,
						 char                  **attribute_v);
gboolean   gth_metadata_provider_can_write	(GthMetadataProvider    *self,
						 const char             *mime_type,
						 char                  **attribute_v);
void       gth_metadata_provider_read		(GthMetadataProvider    *self,
						 GthFileData            *file_data,
						 const char             *attributes,
						 GCancellable           *cancellable);
void       gth_metadata_provider_write		(GthMetadataProvider    *self,
						 GthMetadataWriteFlags   flags,
						 GthFileData            *file_data,
						 const char             *attributes,
						 GCancellable           *cancellable);
int        gth_metadata_provider_get_priority   (GthMetadataProvider    *self);
void       _g_query_metadata_async		(GList                  *files,       /* GthFileData * list */
						 const char             *attributes,
						 GCancellable           *cancellable,
						 GAsyncReadyCallback     callback,
						 gpointer                user_data);
GList *    _g_query_metadata_finish		(GAsyncResult           *result,
						 GError                **error);
void       _g_write_metadata_async		(GList                  *files, /* GthFileData * list */
						 GthMetadataWriteFlags   flags,
						 const char             *attributes,
						 GCancellable           *cancellable,
						 GAsyncReadyCallback     callback,
						 gpointer                user_data);
gboolean   _g_write_metadata_finish		(GAsyncResult           *result,
						 GError                **error);
void       _g_query_all_metadata_async		(GList                  *files, /* GFile * list */
						 GthListFlags            flags,
						 const char             *attributes,
						 GCancellable           *cancellable,
						 InfoReadyCallback       ready_func,
						 gpointer                user_data);

G_END_DECLS

#endif /* GTH_METADATA_PROVIDER_H */
