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

/*

 * GData Client

 * Copyright (C) 2014 Carlos Garnacho <carlosg@gnome.org>

 *

 * 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/>.

 */

/**

 * SECTION:gdata-freebase-service

 * @short_description: GData Freebase service object

 * @stability: Stable

 * @include: gdata/services/freebase/gdata-freebase-service.h

 *

 * #GDataFreebaseService is a subclass of #GDataService for communicating with the Google Freebase API. It supports queries

 * in MQL format, that allows highly flexible queries on any topic. MQL is a JSON based query language, MQL requests consist

 * of a mix of defined and empty values for types in the Freebase schema, those "placeholder" values will be filled in on the

 * reply. For more information and examples, see the <ulink type="http" url="https://developers.google.com/freebase/v1/mql-overview">

 * MQL overview page</ulink>.

 *

 * For more details of Google Freebase API, see the <ulink type="http" url="https://developers.google.com/freebase/v1/">

 * online documentation</ulink>.

 *

 * Since August 2016, [Google has retired Freebase](https://developers.google.com/freebase/),

 * so all of these APIs will return an error if used; and should be considered

 * deprecated.

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

#include <config.h>

#include <glib.h>

#include <glib/gi18n-lib.h>

#include <string.h>

#include "gdata-freebase-service.h"

#include "gdata-freebase-result.h"

#include "gdata-freebase-search-result.h"

#include "gdata-service.h"

#include "gdata-private.h"

#include "gdata-query.h"

#include "gdata-feed.h"

G_GNUC_BEGIN_IGNORE_DEPRECATIONS

/* Standards reference at https://developers.google.com/freebase/v1/ */

#define URLBASE "://www.googleapis.com/freebase/v1"

#define IMAGE_URI_PREFIX "https://usercontent.googleapis.com/freebase/v1/image"

enum {

	PROP_DEVELOPER_KEY = 1

};

struct _GDataFreebaseServicePrivate {

	gchar *developer_key;

};

static void gdata_freebase_service_set_property (GObject *self, guint prop_id, const GValue *value, GParamSpec *pspec);

static void gdata_freebase_service_get_property (GObject *self, guint prop_id, GValue *value, GParamSpec *pspec);

static void gdata_freebase_service_finalize (GObject *self);

static void append_query_headers (GDataService *self, GDataAuthorizationDomain *domain, SoupMessage *message);

static GList *get_authorization_domains (void);

_GDATA_DEFINE_AUTHORIZATION_DOMAIN (freebase, "freebase", "https://www.googleapis.com/auth/freebase.readonly")

G_DEFINE_TYPE (GDataFreebaseService, gdata_freebase_service, GDATA_TYPE_SERVICE)

static void

gdata_freebase_service_class_init (GDataFreebaseServiceClass *klass)

{

	GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

	GDataServiceClass *service_class = GDATA_SERVICE_CLASS (klass);

	g_type_class_add_private (klass, sizeof (GDataFreebaseServicePrivate));

	gobject_class->set_property = gdata_freebase_service_set_property;

	gobject_class->get_property = gdata_freebase_service_get_property;

	gobject_class->finalize = gdata_freebase_service_finalize;

	service_class->append_query_headers = append_query_headers;

	service_class->get_authorization_domains = get_authorization_domains;

	/**

	 * GDataFreebaseService:developer-key:

	 *

	 * The developer key your application has registered with the Freebase API. For more information, see the 

	 * url="https://developers.google.com/freebase/v1/how-tos/authorizing">online documentation</ulink>.

	 *

	 * Since: 0.15.1

	 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

	 */

	g_object_class_install_property (gobject_class, PROP_DEVELOPER_KEY,

	                                 g_param_spec_string ("developer-key",

	                                                      "Developer key", "Your Freebase developer API key.",

	                                                      NULL,

	                                                      G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |

	                                                      G_PARAM_DEPRECATED));

}

static void

gdata_freebase_service_init (GDataFreebaseService *self)

{

	self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, GDATA_TYPE_FREEBASE_SERVICE, GDataFreebaseServicePrivate);

}

static void

append_query_headers (GDataService *self, GDataAuthorizationDomain *domain, SoupMessage *message)

{

	GDataFreebaseServicePrivate *priv = GDATA_FREEBASE_SERVICE (self)->priv;

	const gchar *query;

	GString *new_query;

	SoupURI *uri;

	g_assert (message != NULL);

	if (priv->developer_key) {

		uri = soup_message_get_uri (message);

		query = soup_uri_get_query (uri);

		/* Set the key on every request, as per

		 * https://developers.google.com/freebase/v1/parameters

		 */

		if (query) {

			new_query = g_string_new (query);

			g_string_append (new_query, "&key=");

			g_string_append_uri_escaped (new_query, priv->developer_key, NULL, FALSE);

			soup_uri_set_query (uri, new_query->str);

			g_string_free (new_query, TRUE);

		}

	}

	/* Chain up to the parent class */

	GDATA_SERVICE_CLASS (gdata_freebase_service_parent_class)->append_query_headers (self, domain, message);

}

static GList *

get_authorization_domains (void)

{

	return g_list_prepend (NULL, get_freebase_authorization_domain ());

}

static void

gdata_freebase_service_set_property (GObject *self, guint prop_id, const GValue *value, GParamSpec *pspec)

{

	GDataFreebaseServicePrivate *priv = GDATA_FREEBASE_SERVICE (self)->priv;

	switch (prop_id) {

	case PROP_DEVELOPER_KEY:

		priv->developer_key = g_value_dup_string (value);

		break;

	default:

		G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);

		break;

	}

}

static void

gdata_freebase_service_get_property (GObject *self, guint prop_id, GValue *value, GParamSpec *pspec)

{

	GDataFreebaseServicePrivate *priv = GDATA_FREEBASE_SERVICE (self)->priv;

	switch (prop_id) {

	case PROP_DEVELOPER_KEY:

		g_value_set_string (value, priv->developer_key);

		break;

	default:

		G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);

		break;

	}

}

static void

gdata_freebase_service_finalize (GObject *self)

{

	GDataFreebaseServicePrivate *priv = GDATA_FREEBASE_SERVICE (self)->priv;

	g_free (priv->developer_key);

	G_OBJECT_CLASS (gdata_freebase_service_parent_class)->finalize (self);

}

/**

 * gdata_freebase_service_new:

 * @developer_key: (allow-none): developer key to use the API, or %NULL

 * @authorizer: (allow-none): a #GDataAuthorizer to authorize the service's requests, or %NULL

 *

 * Creates a new #GDataFreebaseService using the given #GDataAuthorizer. If @authorizer is %NULL, all requests are made as an unauthenticated user.

 * Having both @developer_key and @authorizer set to %NULL is allowed, but this should be reserved for debugging situations, as there is a certain

 * key-less quota for those purposes. If this service is used on any code intended to be deployed, one or both of @developer_key and @authorizer

 * should be non-%NULL and valid.

 *

 * Return value: (transfer full): a new #GDataFreebaseService; unref with g_object_unref()

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

GDataFreebaseService *

gdata_freebase_service_new (const gchar *developer_key, GDataAuthorizer *authorizer)

{

	g_return_val_if_fail (authorizer == NULL || GDATA_IS_AUTHORIZER (authorizer), NULL);

	return g_object_new (GDATA_TYPE_FREEBASE_SERVICE,

	                     "developer-key", developer_key,

	                     "authorizer", authorizer,

	                     NULL);

}

/**

 * gdata_freebase_service_get_primary_authorization_domain:

 *

 * The primary #GDataAuthorizationDomain for interacting with Freebase. This will not normally need to be used, as it's used internally

 * by the #GDataFreebaseService methods. However, if using the plain #GDataService methods to implement custom queries or requests which libgdata

 * does not support natively, then this domain may be needed to authorize the requests.

 *

 * The domain never changes, and is interned so that pointer comparison can be used to differentiate it from other authorization domains.

 *

 * Return value: (transfer none): the service's authorization domain

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

GDataAuthorizationDomain *

gdata_freebase_service_get_primary_authorization_domain (void)

{

	return get_freebase_authorization_domain ();

}

/**

 * gdata_freebase_service_query:

 * @self: a #GDataFreebaseService

 * @query: a #GDataFreebaseQuery with the MQL query

 * @cancellable: (allow-none): optional #GCancellable object, or %NULL

 * @error: (allow-none): a #GError, or %NULL

 *

 * Performs a MQL query on the service, you can find out more about MQL in the <ulink type="http" url="http://mql.freebaseapps.com/index.html">online MQL documentation</ulink>.

 *

 * Return value: (transfer full): a #GDataFreebaseResult containing the query result; unref with g_object_unref()

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

GDataFreebaseResult *

gdata_freebase_service_query (GDataFreebaseService *self, GDataFreebaseQuery *query,

			      GCancellable *cancellable, GError **error)

{

	GDataEntry *entry;

	g_return_val_if_fail (GDATA_IS_FREEBASE_SERVICE (self), NULL);

	g_return_val_if_fail (GDATA_IS_FREEBASE_QUERY (query), NULL);

	g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);

	g_return_val_if_fail (error == NULL || *error == NULL, NULL);

	entry = gdata_service_query_single_entry (GDATA_SERVICE (self), get_freebase_authorization_domain (), "mqlread",

						  GDATA_QUERY (query), GDATA_TYPE_FREEBASE_RESULT, cancellable, error);

	if (entry == NULL)

		return NULL;

	return GDATA_FREEBASE_RESULT (entry);

}

/**

 * gdata_freebase_service_query_async:

 * @self: a #GDataFreebaseService

 * @query: a #GDataFreebaseQuery with the MQL query

 * @cancellable: (allow-none): optional #GCancellable object, or %NULL

 * @callback: a #GAsyncReadyCallback to call when authentication is finished

 * @user_data: (closure): data to pass to the @callback function

 *

 * Performs a MQL query on the service. @self and @query are all reffed when this function is called, so can safely

 * be unreffed after this function returns. When the query is replied, or fails, @callback will be executed, and

 * the result can be obtained through gdata_service_query_single_entry_finish().

 *

 * For more details, see gdata_freebase_service_query(), which is the synchronous version of

 * this function.

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

void

gdata_freebase_service_query_async (GDataFreebaseService *self, GDataFreebaseQuery *query, GCancellable *cancellable,

				    GAsyncReadyCallback callback, gpointer user_data)

{

	g_return_if_fail (GDATA_IS_FREEBASE_SERVICE (self));

	g_return_if_fail (GDATA_IS_FREEBASE_QUERY (query));

	g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));

	g_return_if_fail (callback != NULL);

	gdata_service_query_single_entry_async (GDATA_SERVICE (self), get_freebase_authorization_domain (), "mqlread",

						GDATA_QUERY (query), GDATA_TYPE_FREEBASE_RESULT, cancellable, callback, user_data);

}

/**

 * gdata_freebase_service_get_topic:

 * @self: a #GDataFreebaseService

 * @query: a #GDataFreebaseTopicQuery containing the topic ID

 * @cancellable: (allow-none): optional #GCancellable object, or %NULL

 * @error: (allow-none): a #GError, or %NULL

 *

 * Queries information about a topic, identified through a Freebase ID. You can find out more about topic queries in the

 * <ulink type="http" url="https://developers.google.com/freebase/v1/topic-response">online documentation</ulink>.

 *

 * Return value: (transfer full): a #GDataFreebaseTopicResult containing information about the topic; unref with g_object_unref()

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

GDataFreebaseTopicResult *

gdata_freebase_service_get_topic (GDataFreebaseService *self, GDataFreebaseTopicQuery *query, GCancellable *cancellable, GError **error)

{

	GDataEntry *entry;

	g_return_val_if_fail (GDATA_IS_FREEBASE_SERVICE (self), NULL);

	g_return_val_if_fail (GDATA_IS_FREEBASE_TOPIC_QUERY (query), NULL);

	g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);

	g_return_val_if_fail (error == NULL || *error == NULL, NULL);

	entry = gdata_service_query_single_entry (GDATA_SERVICE (self), get_freebase_authorization_domain (), "topic",

						  GDATA_QUERY (query), GDATA_TYPE_FREEBASE_TOPIC_RESULT, cancellable, error);

	if (entry == NULL)

		return NULL;

	return GDATA_FREEBASE_TOPIC_RESULT (entry);

}

/**

 * gdata_freebase_service_get_topic_async:

 * @self: a #GDataFreebaseService

 * @query: a #GDataFreebaseQuery with the MQL query

 * @cancellable: (allow-none): optional #GCancellable object, or %NULL

 * @callback: a #GAsyncReadyCallback to call when authentication is finished

 * @user_data: (closure): data to pass to the @callback function

 *

 * Queries information about a topic, identified through a Freebase ID. @self and @query are all reffed when this

 * function is called, so can safely be unreffed after this function returns. When the query is replied, or fails,

 * @callback will be executed, and the result can be obtained through gdata_service_query_single_entry_finish().

 *

 * For more details, see gdata_freebase_service_get_topic(), which is the synchronous version of

 * this function.

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

void

gdata_freebase_service_get_topic_async (GDataFreebaseService *self, GDataFreebaseTopicQuery *query,

					GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data)

{

	g_return_if_fail (GDATA_IS_FREEBASE_SERVICE (self));

	g_return_if_fail (GDATA_IS_FREEBASE_TOPIC_QUERY (query));

	g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));

	g_return_if_fail (callback != NULL);

	gdata_service_query_single_entry_async (GDATA_SERVICE (self), get_freebase_authorization_domain (), "topic",

						GDATA_QUERY (query), GDATA_TYPE_FREEBASE_TOPIC_RESULT, cancellable, callback, user_data);

}

/**

 * gdata_freebase_service_search:

 * @self: a #GDataFreebaseService

 * @query: a #GDataFreebaseSearchQuery containing the topic ID

 * @cancellable: (allow-none): optional #GCancellable object, or %NULL

 * @error: (allow-none): a #GError, or %NULL

 *

 * Performs a search for any given search term, filters can be set on @query to narrow down the results. The results returned

 * are ordered by relevance. You can find out more about topic queries in the

 * <ulink type="http" url="https://developers.google.com/freebase/v1/search-cookbook">online documentation</ulink>.

 *

 * Return value: (transfer full): a #GDataFreebaseSearchResult containing the results for the given search query; unref with g_object_unref()

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

GDataFreebaseSearchResult *

gdata_freebase_service_search (GDataFreebaseService *self, GDataFreebaseSearchQuery *query, GCancellable *cancellable, GError **error)

{

	GDataEntry *entry;

	g_return_val_if_fail (GDATA_IS_FREEBASE_SERVICE (self), NULL);

	g_return_val_if_fail (GDATA_IS_FREEBASE_SEARCH_QUERY (query), NULL);

	g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);

	g_return_val_if_fail (error == NULL || *error == NULL, NULL);

	entry = gdata_service_query_single_entry (GDATA_SERVICE (self), get_freebase_authorization_domain (), "search",

						  GDATA_QUERY (query), GDATA_TYPE_FREEBASE_SEARCH_RESULT, cancellable, error);

	if (entry == NULL)

		return NULL;

	return GDATA_FREEBASE_SEARCH_RESULT (entry);

}

/**

 * gdata_freebase_service_search_async:

 * @self: a #GDataFreebaseService

 * @query: a #GDataFreebaseQuery with the MQL query

 * @cancellable: (allow-none): optional #GCancellable object, or %NULL

 * @callback: a #GAsyncReadyCallback to call when authentication is finished

 * @user_data: (closure): data to pass to the @callback function

 *

 * Performs a search for any given search term. @self and @query are all reffed when this

 * function is called, so can safely be unreffed after this function returns.

 *

 * For more details, see gdata_freebase_service_search(), which is the synchronous version of

 * this function.

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

void

gdata_freebase_service_search_async (GDataFreebaseService *self, GDataFreebaseSearchQuery *query,

				     GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data)

{

	g_return_if_fail (GDATA_IS_FREEBASE_SERVICE (self));

	g_return_if_fail (GDATA_IS_FREEBASE_SEARCH_QUERY (query));

	g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));

	g_return_if_fail (callback != NULL);

	gdata_service_query_single_entry_async (GDATA_SERVICE (self), get_freebase_authorization_domain (), "search",

						GDATA_QUERY (query), GDATA_TYPE_FREEBASE_SEARCH_RESULT, cancellable, callback, user_data);

}

static gchar *

compose_image_uri (GDataFreebaseTopicValue *value, guint max_width, guint max_height)

{

	GString *uri = g_string_new (IMAGE_URI_PREFIX);

	const GDataFreebaseTopicObject *object;

	gboolean first = TRUE;

	object = gdata_freebase_topic_value_get_object (value);

	g_assert (object != NULL);

	g_string_append (uri, gdata_freebase_topic_object_get_id (object));

#define APPEND_SEP g_string_append_c (uri, first ? '?' : '&';; first = FALSE;

	if (max_width > 0) {

		APPEND_SEP;

		g_string_append_printf (uri, "maxwidth=%d", max_width);

	}

	if (max_height > 0) {

		APPEND_SEP;

		g_string_append_printf (uri, "maxheight=%d", max_height);

	}

#undef APPEND_SEP

	return g_string_free (uri, FALSE);

}

/**

 * gdata_freebase_service_get_image:

 * @self: a #GDataFreebaseService

 * @value: a #GDataFreebaseTopicValue from a topic result

 * @cancellable: (allow-none): optional #GCancellable object, or %NULL

 * @max_width: maximum width of the image returned, or 0

 * @max_height: maximum height of the image returned, or 0

 * @error: (allow-none): a #GError, or %NULL

 *

 * Creates an input stream to an image object returned in a topic query. If @max_width and @max_height

 * are unspecified (i.e. set to 0), the image returned will be the smallest available.

 *

 * Return value: (transfer full): a #GInputStream opened to the image; unref with g_object_unref()

 *

 * Since: 0.15.1

 * Deprecated: 0.17.7: Google Freebase has been permanently shut down.

 */

GInputStream *

gdata_freebase_service_get_image (GDataFreebaseService *self, GDataFreebaseTopicValue *value,

				  GCancellable *cancellable, guint max_width, guint max_height, GError **error)

{

	GInputStream *stream;

	gchar *uri;

	g_return_val_if_fail (GDATA_IS_FREEBASE_SERVICE (self), NULL);

	g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);

	g_return_val_if_fail (value != NULL, NULL);

	g_return_val_if_fail (!error || !*error, NULL);

	g_return_val_if_fail (max_width < 4096 && max_height < 4096, NULL);

	if (!gdata_freebase_topic_value_is_image (value)) {

		g_set_error (error,

			     GDATA_SERVICE_ERROR,

			     GDATA_SERVICE_ERROR_BAD_QUERY_PARAMETER,

			     _("Property ‘%s’ does not hold an image"),

			     gdata_freebase_topic_value_get_property (value));

		return NULL;

	}

	uri = compose_image_uri (value, max_width, max_height);

	stream = gdata_download_stream_new (GDATA_SERVICE (self), get_freebase_authorization_domain (), uri, cancellable);

	g_free (uri);

	return stream;

}

G_GNUC_END_IGNORE_DEPRECATIONS