/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/*
 * GData Client
 * Copyright (C) Philip Withnall 2008, 2009, 2010, 2014 <philip@tecnocode.co.uk>
 *
 * GData Client is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * GData Client 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with GData Client.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GDATA_SERVICE_H
#define GDATA_SERVICE_H

#include <glib.h>
#include <glib-object.h>
#include <libsoup/soup.h>

#include <gdata/gdata-authorizer.h>
#include <gdata/gdata-feed.h>
#include <gdata/gdata-query.h>

G_BEGIN_DECLS

/**
 * GDataOperationType:
 * @GDATA_OPERATION_QUERY: a query
 * @GDATA_OPERATION_INSERTION: an insertion of a #GDataEntry
 * @GDATA_OPERATION_UPDATE: an update of a #GDataEntry
 * @GDATA_OPERATION_DELETION: a deletion of a #GDataEntry
 * @GDATA_OPERATION_DOWNLOAD: a download of a file
 * @GDATA_OPERATION_UPLOAD: an upload of a file
 * @GDATA_OPERATION_AUTHENTICATION: authentication with the service
 * @GDATA_OPERATION_BATCH: a batch operation with #GDataBatchOperation
 *
 * Representations of the different operations performed by the library.
 *
 * Since: 0.6.0
 */
typedef enum {
	GDATA_OPERATION_QUERY = 1,
	GDATA_OPERATION_INSERTION,
	GDATA_OPERATION_UPDATE,
	GDATA_OPERATION_DELETION,
	GDATA_OPERATION_DOWNLOAD,
	GDATA_OPERATION_UPLOAD,
	GDATA_OPERATION_AUTHENTICATION,
	GDATA_OPERATION_BATCH
} GDataOperationType;

/**
 * GDataServiceError:
 * @GDATA_SERVICE_ERROR_UNAVAILABLE: The service is unavailable due to maintainence or other reasons (e.g. network errors at the server end)
 * @GDATA_SERVICE_ERROR_PROTOCOL_ERROR: The client or server unexpectedly strayed from the protocol (fatal error)
 * @GDATA_SERVICE_ERROR_ENTRY_ALREADY_INSERTED: An entry has already been inserted, and cannot be re-inserted
 * @GDATA_SERVICE_ERROR_AUTHENTICATION_REQUIRED: The user attempted to do something which required authentication, and they weren't authenticated or
 * didn't have authorization for the operation
 * @GDATA_SERVICE_ERROR_NOT_FOUND: A requested resource (feed or entry) was not found on the server
 * @GDATA_SERVICE_ERROR_CONFLICT: There was a conflict when updating an entry on the server; the server-side copy was modified inbetween downloading
 * and uploading the modified entry
 * @GDATA_SERVICE_ERROR_FORBIDDEN: Generic error for a forbidden action (not due to having insufficient permissions)
 * @GDATA_SERVICE_ERROR_BAD_QUERY_PARAMETER: A given query parameter was invalid for the query type
 * @GDATA_SERVICE_ERROR_NETWORK_ERROR: The service is unavailable due to local network errors (e.g. no Internet connection)
 * @GDATA_SERVICE_ERROR_PROXY_ERROR: The service is unavailable due to proxy network errors (e.g. proxy unreachable)
 * @GDATA_SERVICE_ERROR_WITH_BATCH_OPERATION: Generic error when running a batch operation and the whole operation fails
 * @GDATA_SERVICE_ERROR_API_QUOTA_EXCEEDED: The API request quota for this
 * developer account has been exceeded for the current time period (e.g. day).
 * Try again later. (Since: 0.16.0.)
 *
 * Error codes for #GDataService operations.
 */
typedef enum {
	GDATA_SERVICE_ERROR_UNAVAILABLE = 1,
	GDATA_SERVICE_ERROR_PROTOCOL_ERROR,
	GDATA_SERVICE_ERROR_ENTRY_ALREADY_INSERTED,
	GDATA_SERVICE_ERROR_AUTHENTICATION_REQUIRED,
	GDATA_SERVICE_ERROR_NOT_FOUND,
	GDATA_SERVICE_ERROR_CONFLICT,
	GDATA_SERVICE_ERROR_FORBIDDEN,
	GDATA_SERVICE_ERROR_BAD_QUERY_PARAMETER,
	GDATA_SERVICE_ERROR_NETWORK_ERROR,
	GDATA_SERVICE_ERROR_PROXY_ERROR,
	GDATA_SERVICE_ERROR_WITH_BATCH_OPERATION,
	GDATA_SERVICE_ERROR_API_QUOTA_EXCEEDED,
} GDataServiceError;

/**
 * GDataQueryProgressCallback:
 * @entry: a new #GDataEntry
 * @entry_key: the key of the entry (zero-based index of its position in the feed)
 * @entry_count: the total number of entries in the feed
 * @user_data: user data passed to the callback
 *
 * Callback function called for each #GDataEntry parsed in a #GDataFeed when loading the results of a query.
 *
 * It is called in the main thread, so there is no guarantee on the order in which the callbacks are executed,
 * or whether they will be called in a timely manner. It is, however, guaranteed that they will all be called before
 * the #GAsyncReadyCallback which signals the completion of the query is called.
 */
typedef void (*GDataQueryProgressCallback) (GDataEntry *entry, guint entry_key, guint entry_count, gpointer user_data);

#define GDATA_TYPE_SERVICE		(gdata_service_get_type ())
#define GDATA_SERVICE(o)		(G_TYPE_CHECK_INSTANCE_CAST ((o), GDATA_TYPE_SERVICE, GDataService))
#define GDATA_SERVICE_CLASS(k)		(G_TYPE_CHECK_CLASS_CAST((k), GDATA_TYPE_SERVICE, GDataServiceClass))
#define GDATA_IS_SERVICE(o)		(G_TYPE_CHECK_INSTANCE_TYPE ((o), GDATA_TYPE_SERVICE))
#define GDATA_IS_SERVICE_CLASS(k)	(G_TYPE_CHECK_CLASS_TYPE ((k), GDATA_TYPE_SERVICE))
#define GDATA_SERVICE_GET_CLASS(o)	(G_TYPE_INSTANCE_GET_CLASS ((o), GDATA_TYPE_SERVICE, GDataServiceClass))

#define GDATA_SERVICE_ERROR		gdata_service_error_quark ()

typedef struct _GDataServicePrivate	GDataServicePrivate;

/**
 * GDataService:
 *
 * All the fields in the #GDataService structure are private and should never be accessed directly.
 */
typedef struct {
	GObject parent;
	GDataServicePrivate *priv;
} GDataService;

/**
 * GDataServiceClass:
 * @parent: the parent class
 * @api_version: the version of the GData API used by the service (typically <code class="literal">2</code>)
 * @feed_type: the #GType of the feed class (subclass of #GDataFeed) to use for query results from this service
 * @append_query_headers: a function to allow subclasses to append their own headers to queries before they are submitted to the online service,
 * using the given authorization domain; new in version 0.9.0
 * @parse_error_response: a function to parse error responses to queries from the online service. It should set the error
 * from the status, reason phrase and response body it is passed.
 * @get_authorization_domains: a function to return a newly-allocated list of all the #GDataAuthorizationDomains the service makes use of;
 * while the list should be newly-allocated, the individual domains should not be; not implementing this function is equivalent to returning an
 * empty list; new in version 0.9.0
 * @parse_feed: a function to parse feed responses to queries from the online
 * service; new in version 0.17.0
 *
 * The class structure for the #GDataService type.
 *
 * Since: 0.9.0
 */
typedef struct {
	GObjectClass parent;

	const gchar *api_version;
	GType feed_type;

	void (*append_query_headers) (GDataService *self, GDataAuthorizationDomain *domain, SoupMessage *message);
	void (*parse_error_response) (GDataService *self, GDataOperationType operation_type, guint status, const gchar *reason_phrase,
	                              const gchar *response_body, gint length, GError **error);
	GList *(*get_authorization_domains) (void);
	GDataFeed *(*parse_feed) (GDataService *self,
	                          GDataAuthorizationDomain *domain,
	                          GDataQuery *query,
	                          GType entry_type,
	                          SoupMessage *message,
	                          GCancellable *cancellable,
	                          GDataQueryProgressCallback progress_callback,
	                          gpointer progress_user_data,
	                          GError **error);

	/*< private >*/
	/* Padding for future expansion */
	void (*_g_reserved1) (void);
	void (*_g_reserved2) (void);
	void (*_g_reserved3) (void);
	void (*_g_reserved4) (void);
	void (*_g_reserved5) (void);
	void (*_g_reserved6) (void);
	void (*_g_reserved7) (void);
} GDataServiceClass;

G_DEFINE_AUTOPTR_CLEANUP_FUNC (GDataService, g_object_unref)

GType gdata_service_get_type (void) G_GNUC_CONST;
GQuark gdata_service_error_quark (void) G_GNUC_CONST;

GList *gdata_service_get_authorization_domains (GType service_type) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;
gboolean gdata_service_is_authorized (GDataService *self);

GDataAuthorizer *gdata_service_get_authorizer (GDataService *self) G_GNUC_PURE;
void gdata_service_set_authorizer (GDataService *self, GDataAuthorizer *authorizer);

#include <gdata/gdata-query.h>

GDataFeed *gdata_service_query (GDataService *self, GDataAuthorizationDomain *domain, const gchar *feed_uri, GDataQuery *query, GType entry_type,
                                GCancellable *cancellable,
                                GDataQueryProgressCallback progress_callback, gpointer progress_user_data,
                                GError **error) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;
void gdata_service_query_async (GDataService *self, GDataAuthorizationDomain *domain, const gchar *feed_uri, GDataQuery *query, GType entry_type,
                                GCancellable *cancellable,
                                GDataQueryProgressCallback progress_callback, gpointer progress_user_data, GDestroyNotify destroy_progress_user_data,
                                GAsyncReadyCallback callback, gpointer user_data);
GDataFeed *gdata_service_query_finish (GDataService *self, GAsyncResult *async_result, GError **error) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;

GDataEntry *gdata_service_query_single_entry (GDataService *self, GDataAuthorizationDomain *domain, const gchar *entry_id, GDataQuery *query,
                                              GType entry_type, GCancellable *cancellable, GError **error) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;
void gdata_service_query_single_entry_async (GDataService *self, GDataAuthorizationDomain *domain, const gchar *entry_id, GDataQuery *query,
                                             GType entry_type, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data);
GDataEntry *gdata_service_query_single_entry_finish (GDataService *self, GAsyncResult *async_result,
                                                     GError **error) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;

GDataEntry *gdata_service_insert_entry (GDataService *self, GDataAuthorizationDomain *domain, const gchar *upload_uri, GDataEntry *entry,
                                        GCancellable *cancellable, GError **error) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;
void gdata_service_insert_entry_async (GDataService *self, GDataAuthorizationDomain *domain, const gchar *upload_uri, GDataEntry *entry,
                                       GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data);
GDataEntry *gdata_service_insert_entry_finish (GDataService *self, GAsyncResult *async_result,
                                               GError **error) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;

GDataEntry *gdata_service_update_entry (GDataService *self, GDataAuthorizationDomain *domain, GDataEntry *entry,
                                        GCancellable *cancellable, GError **error) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;
void gdata_service_update_entry_async (GDataService *self, GDataAuthorizationDomain *domain, GDataEntry *entry, GCancellable *cancellable,
                                       GAsyncReadyCallback callback, gpointer user_data);
GDataEntry *gdata_service_update_entry_finish (GDataService *self, GAsyncResult *async_result,
                                               GError **error) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;

gboolean gdata_service_delete_entry (GDataService *self, GDataAuthorizationDomain *domain, GDataEntry *entry,
                                     GCancellable *cancellable, GError **error);
void gdata_service_delete_entry_async (GDataService *self, GDataAuthorizationDomain *domain, GDataEntry *entry, GCancellable *cancellable,
                                       GAsyncReadyCallback callback, gpointer user_data);
gboolean gdata_service_delete_entry_finish (GDataService *self, GAsyncResult *async_result, GError **error);

#ifndef LIBGDATA_DISABLE_DEPRECATED
SoupURI *gdata_service_get_proxy_uri (GDataService *self) G_GNUC_PURE G_GNUC_DEPRECATED_FOR (gdata_service_get_proxy_resolver);
void gdata_service_set_proxy_uri (GDataService *self, SoupURI *proxy_uri) G_GNUC_DEPRECATED_FOR (gdata_service_set_proxy_resolver);
#endif /* !LIBGDATA_DISABLE_DEPRECATED */

GProxyResolver *gdata_service_get_proxy_resolver (GDataService *self) G_GNUC_PURE;
void gdata_service_set_proxy_resolver (GDataService *self, GProxyResolver *proxy_resolver);

guint gdata_service_get_timeout (GDataService *self) G_GNUC_PURE;
void gdata_service_set_timeout (GDataService *self, guint timeout);

const gchar *gdata_service_get_locale (GDataService *self) G_GNUC_PURE;
void gdata_service_set_locale (GDataService *self, const gchar *locale);

G_END_DECLS

#endif /* !GDATA_SERVICE_H */
