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

/*
 *  Pix
 *
 *  Copyright (C) 2010 The 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/>.
 */

#include <config.h>
#define GDK_PIXBUF_ENABLE_BACKEND
#include <gtk/gtk.h>
#include <pix.h>
#include <extensions/importer/importer.h>
#include <extensions/oauth/oauth.h>
#include "dlg-import-from-facebook.h"
#include "facebook-album.h"
#include "facebook-photo.h"
#include "facebook-service.h"


#define GET_WIDGET(x) (_gtk_builder_get_widget (data->builder, (x)))
#define FAKE_SIZE 100000
#define THUMBNAIL_SIZE 110


enum {
	ACCOUNT_DATA_COLUMN,
	ACCOUNT_NAME_COLUMN
};


enum {
	ALBUM_DATA_COLUMN,
	ALBUM_NAME_COLUMN,
	ALBUM_ICON_COLUMN,
	ALBUM_SIZE_COLUMN
};


typedef struct {
	GthBrowser           *browser;
	GthFileData          *location;
	GtkBuilder           *builder;
	GtkWidget            *dialog;
	GtkWidget            *preferences_dialog;
	GtkWidget            *progress_dialog;
	FacebookService      *service;
	GtkWidget            *file_list;
	GList                *albums;
	FacebookAlbum        *album;
	GList                *photos;
	GCancellable         *cancellable;
} DialogData;


static void
import_dialog_destroy_cb (GtkWidget  *widget,
			  DialogData *data)
{
	if (data->service != NULL)
		gth_task_completed (GTH_TASK (data->service), NULL);
	_g_object_unref (data->cancellable);
	_g_object_unref (data->service);
	_g_object_list_unref (data->albums);
	_g_object_unref (data->album);
	_g_object_list_unref (data->photos);
	gtk_widget_destroy (data->progress_dialog);
	_g_object_unref (data->builder);
	_g_object_unref (data->location);
	g_free (data);
}


static GList *
get_files_to_download (DialogData *data)
{
	GthFileView *file_view;
	GList       *selected;
	GList       *file_list;

	file_view = (GthFileView *) gth_file_list_get_view (GTH_FILE_LIST (data->file_list));
	selected = gth_file_selection_get_selected (GTH_FILE_SELECTION (file_view));
	if (selected != NULL)
		file_list = gth_file_list_get_files (GTH_FILE_LIST (data->file_list), selected);
	else
		file_list = gth_file_store_get_visibles (GTH_FILE_STORE (gth_file_view_get_model (file_view)));

	_gtk_tree_path_list_free (selected);

	return file_list;
}


static void
import_dialog_response_cb (GtkDialog *dialog,
			   int        response_id,
			   gpointer   user_data)
{
	DialogData *data = user_data;

	switch (response_id) {
	case GTK_RESPONSE_DELETE_EVENT:
	case GTK_RESPONSE_CANCEL:
		gth_file_list_cancel (GTH_FILE_LIST (data->file_list), (DataFunc) gtk_widget_destroy, data->dialog);
		break;

	case GTK_RESPONSE_OK:
		{
			GtkTreeIter    iter;
			FacebookAlbum *album;
			GList         *file_list;

			if (! gtk_combo_box_get_active_iter (GTK_COMBO_BOX (GET_WIDGET ("album_combobox")), &iter)) {
				gtk_widget_set_sensitive (GET_WIDGET ("download_button"), FALSE);
				return;
			}

			gtk_tree_model_get (GTK_TREE_MODEL (GET_WIDGET ("album_liststore")), &iter,
					    ALBUM_DATA_COLUMN, &album,
					    -1);

			file_list = get_files_to_download (data);
			if (file_list != NULL) {
				GSettings           *settings;
				GFile               *destination;
				gboolean             single_subfolder;
				GthSubfolderType     subfolder_type;
				GthSubfolderFormat   subfolder_format;
				char                *custom_format;
				GthTask             *task;

				settings = g_settings_new (PIX_IMPORTER_SCHEMA);
				destination = gth_import_preferences_get_destination ();
				subfolder_type = g_settings_get_enum (settings, PREF_IMPORTER_SUBFOLDER_TYPE);
				subfolder_format = g_settings_get_enum (settings, PREF_IMPORTER_SUBFOLDER_FORMAT);
				single_subfolder = g_settings_get_boolean (settings, PREF_IMPORTER_SUBFOLDER_SINGLE);
				custom_format = g_settings_get_string (settings, PREF_IMPORTER_SUBFOLDER_CUSTOM_FORMAT);

				task = gth_import_task_new (data->browser,
							    file_list,
							    destination,
							    subfolder_type,
							    subfolder_format,
							    single_subfolder,
							    custom_format,
							    (album->name != NULL ? album->name : ""),
							    NULL,
							    FALSE,
							    FALSE,
							    FALSE);
				gth_browser_exec_task (data->browser, task, FALSE);
				gtk_widget_destroy (data->dialog);

				g_object_unref (task);
				_g_object_unref (destination);
				g_object_unref (settings);
			}

			_g_object_list_unref (file_list);
			g_object_unref (album);
		}
		break;

	default:
		break;
	}
}


static void
update_account_list (DialogData *data)
{
	int           current_account_idx;
	OAuthAccount *current_account;
	int           idx;
	GList        *scan;
	GtkTreeIter   iter;

	gtk_list_store_clear (GTK_LIST_STORE (GET_WIDGET ("account_liststore")));

	current_account_idx = 0;
	current_account = web_service_get_current_account (WEB_SERVICE (data->service));
	for (scan = web_service_get_accounts (WEB_SERVICE (data->service)), idx = 0; scan; scan = scan->next, idx++) {
		OAuthAccount *account = scan->data;

		if (oauth_account_cmp (current_account, account) == 0)
			current_account_idx = idx;

		gtk_list_store_append (GTK_LIST_STORE (GET_WIDGET ("account_liststore")), &iter);
		gtk_list_store_set (GTK_LIST_STORE (GET_WIDGET ("account_liststore")), &iter,
				    ACCOUNT_DATA_COLUMN, account,
				    ACCOUNT_NAME_COLUMN, account->name,
				    -1);
	}
	gtk_combo_box_set_active (GTK_COMBO_BOX (GET_WIDGET ("account_combobox")), current_account_idx);
}


static void
get_albums_ready_cb (GObject      *source_object,
		     GAsyncResult *res,
		     gpointer      user_data)
{
	DialogData *data = user_data;
	GError     *error = NULL;
	GList      *scan;

	_g_object_list_unref (data->albums);
	data->albums = facebook_service_get_albums_finish (data->service, res, &error);
	if (error != NULL) {
		if (data->service != NULL)
			gth_task_dialog (GTH_TASK (data->service), TRUE, NULL);
		_gtk_error_dialog_from_gerror_run (GTK_WINDOW (data->browser), _("Could not connect to the server"), error);
		g_clear_error (&error);
		gtk_widget_destroy (data->dialog);
		return;
	}

	gtk_list_store_clear (GTK_LIST_STORE (GET_WIDGET ("album_liststore")));
	for (scan = data->albums; scan; scan = scan->next) {
		FacebookAlbum *album = scan->data;
		char          *n_photos;
		GtkTreeIter    iter;

		n_photos = g_strdup_printf ("(%d)", album->count);

		gtk_list_store_append (GTK_LIST_STORE (GET_WIDGET ("album_liststore")), &iter);
		gtk_list_store_set (GTK_LIST_STORE (GET_WIDGET ("album_liststore")), &iter,
				    ALBUM_DATA_COLUMN, album,
				    ALBUM_ICON_COLUMN, "file-catalog",
				    ALBUM_NAME_COLUMN, album->name,
				    ALBUM_SIZE_COLUMN, n_photos,
				    -1);

		g_free (n_photos);
	}

	gth_task_dialog (GTH_TASK (data->service), TRUE, NULL);

	gtk_window_set_transient_for (GTK_WINDOW (data->dialog), GTK_WINDOW (data->browser));
	gtk_window_set_modal (GTK_WINDOW (data->dialog), FALSE);
	gtk_window_present (GTK_WINDOW (data->dialog));
}


static void
authentication_ready_cb (WebService *service,
			 DialogData *data)
{
	update_account_list (data);
	facebook_service_get_albums (data->service,
				     data->cancellable,
				     get_albums_ready_cb,
				     data);
}


static void
authentication_accounts_changed_cb (WebService *service,
				    DialogData *data)
{
	update_account_list (data);
}


static void
edit_accounts_button_clicked_cb (GtkButton  *button,
				 DialogData *data)
{
	web_service_edit_accounts (WEB_SERVICE (data->service), GTK_WINDOW (data->dialog));
}


static void
account_combobox_changed_cb (GtkComboBox *widget,
			     gpointer     user_data)
{
	DialogData   *data = user_data;
	GtkTreeIter   iter;
	OAuthAccount *account;

	if (! gtk_combo_box_get_active_iter (widget, &iter))
		return;

	gtk_tree_model_get (gtk_combo_box_get_model (widget),
			    &iter,
			    ACCOUNT_DATA_COLUMN, &account,
			    -1);

	if (oauth_account_cmp (account, web_service_get_current_account (WEB_SERVICE (data->service))) != 0)
		web_service_connect (WEB_SERVICE (data->service), account);

	g_object_unref (account);
}


static void
update_selection_status (DialogData *data)
{
	GList *file_list;
	int    n_selected;
	char  *text_selected;

	file_list = get_files_to_download (data);
	n_selected = g_list_length (file_list);
	text_selected = g_strdup_printf (g_dngettext (NULL, "%d file", "%d files", n_selected), n_selected);
	gtk_label_set_text (GTK_LABEL (GET_WIDGET ("images_info_label")), text_selected);

	g_free (text_selected);
	_g_object_list_unref (file_list);
}


static void
list_photos_ready_cb (GObject      *source_object,
		      GAsyncResult *result,
		      gpointer      user_data)
{
	DialogData *data = user_data;
	GError     *error = NULL;
	GList      *list;
	GList      *scan;

	gth_task_dialog (GTH_TASK (data->service), TRUE, NULL);

	_g_object_list_unref (data->photos);
	data->photos = facebook_service_list_photos_finish (data->service, result, &error);
	if (error != NULL) {
		if (data->service != NULL)
			gth_task_dialog (GTH_TASK (data->service), TRUE, NULL);
		_gtk_error_dialog_from_gerror_show (GTK_WINDOW (data->browser), _("Could not get the photo list"), error);
		g_clear_error (&error);
		gtk_widget_destroy (data->dialog);
		return;
	}

	list = NULL;
	for (scan = data->photos; scan; scan = scan->next) {
		FacebookPhoto *photo = scan->data;
		GthFileData   *file_data;

		file_data = gth_file_data_new_for_uri (facebook_photo_get_original_url (photo), "image/jpeg");
		g_file_info_set_file_type (file_data->info, G_FILE_TYPE_REGULAR);
		g_file_info_set_size (file_data->info, FAKE_SIZE); /* set a fake size to make the progress dialog work correctly */
		g_file_info_set_attribute_object (file_data->info, "facebook::object", G_OBJECT (photo));

		list = g_list_prepend (list, file_data);
	}
	gth_file_list_set_files (GTH_FILE_LIST (data->file_list), list);
	update_selection_status (data);
	gtk_widget_set_sensitive (GET_WIDGET ("download_button"), list != NULL);

	_g_object_list_unref (list);
}


static void
album_combobox_changed_cb (GtkComboBox *widget,
			   gpointer     user_data)
{
	DialogData  *data = user_data;
	GtkTreeIter  iter;

	if (! gtk_combo_box_get_active_iter (widget, &iter)) {
		gth_file_list_clear (GTH_FILE_LIST (data->file_list), _("No album selected"));
		return;
	}

	_g_object_unref (data->album);
	gtk_tree_model_get (gtk_combo_box_get_model (widget),
			    &iter,
			    ALBUM_DATA_COLUMN, &data->album,
			    -1);

	gth_import_preferences_dialog_set_event (GTH_IMPORT_PREFERENCES_DIALOG (data->preferences_dialog), data->album->name);

	gth_task_dialog (GTH_TASK (data->service), FALSE, NULL);
	facebook_service_list_photos (data->service,
				      data->album,
				      -1,
				      NULL,
				      data->cancellable,
				      list_photos_ready_cb,
				      data);
}


static GthImage *
facebook_thumbnail_loader (GInputStream  *istream,
			   GthFileData   *file_data,
			   int            requested_size,
			   int           *original_width,
			   int           *original_height,
			   gpointer       user_data,
			   GCancellable  *cancellable,
			   GError       **error)
{
	GthImage      *image = NULL;
	FacebookPhoto *photo;
	const char    *uri;

	photo = (FacebookPhoto *) g_file_info_get_attribute_object (file_data->info, "facebook::object");

	uri = facebook_photo_get_thumbnail_url (photo, requested_size);
	if (uri == NULL)
		uri = facebook_photo_get_original_url (photo);

	if (uri != NULL) {
		GFile *file;
		void  *buffer;
		gsize  size;

		file = g_file_new_for_uri (uri);
		if (_g_file_load_in_buffer (file, &buffer, &size, cancellable, error)) {
			GInputStream *stream;
			GdkPixbuf    *pixbuf;

			stream = g_memory_input_stream_new_from_data (buffer, size, g_free);
			pixbuf = gdk_pixbuf_new_from_stream (stream, cancellable, error);
			if (pixbuf != NULL) {
				GdkPixbuf *rotated;

				rotated = gdk_pixbuf_apply_embedded_orientation (pixbuf);
				g_object_unref (pixbuf);
				pixbuf = rotated;

				image = gth_image_new_for_pixbuf (pixbuf);
			}

			g_object_unref (pixbuf);
			g_object_unref (stream);
		}

		g_object_unref (file);
	}
	else
		*error = g_error_new_literal (GTH_ERROR, 0, "cannot generate the thumbnail");

	return image;
}


static int
facebook_photo_position_func (GthFileData *a,
			      GthFileData *b)
{
	FacebookPhoto *photo_a;
	FacebookPhoto *photo_b;

	photo_a = (FacebookPhoto *) g_file_info_get_attribute_object (a->info, "facebook::object");
	photo_b = (FacebookPhoto *) g_file_info_get_attribute_object (b->info, "facebook::object");

	if (photo_a->position == photo_b->position)
		return strcmp (photo_a->id, photo_b->id);
	else if (photo_a->position > photo_b->position)
		return 1;
	else
		return -1;
}


static void
file_list_selection_changed_cb (GthFileView *file_view,
				gpointer     user_data)
{
	update_selection_status ((DialogData *) user_data);
}


void
dlg_import_from_facebook (GthBrowser *browser)
{
	DialogData     *data;
	GthThumbLoader *thumb_loader;
	char           *title;

	data = g_new0 (DialogData, 1);
	data->browser = browser;
	data->location = gth_file_data_dup (gth_browser_get_location_data (browser));
	data->builder = _gtk_builder_new_from_file ("import-from-facebook.ui", "facebook");
	data->dialog = _gtk_builder_get_widget (data->builder, "import_dialog");
	data->cancellable = g_cancellable_new ();

	{
		GtkCellLayout   *cell_layout;
		GtkCellRenderer *renderer;

		cell_layout = GTK_CELL_LAYOUT (GET_WIDGET ("album_combobox"));

		renderer = gtk_cell_renderer_pixbuf_new ();
		gtk_cell_layout_pack_start (cell_layout, renderer, FALSE);
		gtk_cell_layout_set_attributes (cell_layout, renderer,
						"icon-name", ALBUM_ICON_COLUMN,
						NULL);

		renderer = gtk_cell_renderer_text_new ();
		gtk_cell_layout_pack_start (cell_layout, renderer, TRUE);
		gtk_cell_layout_set_attributes (cell_layout, renderer,
						"text", ALBUM_NAME_COLUMN,
						NULL);

		renderer = gtk_cell_renderer_text_new ();
		gtk_cell_layout_pack_start (cell_layout, renderer, FALSE);
		gtk_cell_layout_set_attributes (cell_layout, renderer,
						"text", ALBUM_SIZE_COLUMN,
						NULL);
	}

	/* Set the widget data */

	data->file_list = gth_file_list_new (gth_grid_view_new (), GTH_FILE_LIST_MODE_NORMAL, FALSE);
	thumb_loader = gth_file_list_get_thumb_loader (GTH_FILE_LIST (data->file_list));
	gth_thumb_loader_set_use_cache (thumb_loader, FALSE);
	gth_thumb_loader_set_loader_func (thumb_loader, facebook_thumbnail_loader);
	gth_file_list_set_thumb_size (GTH_FILE_LIST (data->file_list), THUMBNAIL_SIZE);
	gth_file_list_enable_thumbs (GTH_FILE_LIST (data->file_list), TRUE);
	gth_file_list_set_ignore_hidden (GTH_FILE_LIST (data->file_list), TRUE);
	gth_file_list_set_caption (GTH_FILE_LIST (data->file_list), "none");
	gth_file_list_set_sort_func (GTH_FILE_LIST (data->file_list), facebook_photo_position_func, FALSE);
	gth_file_list_clear (GTH_FILE_LIST (data->file_list), _("No album selected"));
	gtk_widget_show (data->file_list);
	gtk_box_pack_start (GTK_BOX (GET_WIDGET ("images_box")), data->file_list, TRUE, TRUE, 0);

	gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (GET_WIDGET ("album_liststore")), ALBUM_NAME_COLUMN, GTK_SORT_ASCENDING);

	gtk_widget_set_sensitive (GET_WIDGET ("download_button"), FALSE);

	data->preferences_dialog = gth_import_preferences_dialog_new ();
	gtk_window_set_transient_for (GTK_WINDOW (data->preferences_dialog), GTK_WINDOW (data->dialog));

	gtk_box_pack_start (GTK_BOX (GET_WIDGET ("destination_button_box")),
			    gth_import_destination_button_new (GTH_IMPORT_PREFERENCES_DIALOG (data->preferences_dialog)),
			    TRUE,
			    TRUE,
			    0);
	gtk_widget_show_all (GET_WIDGET ("destination_button_box"));

	title = g_strdup_printf (_("Import from %s"), _("Facebook"));
	gtk_window_set_title (GTK_WINDOW (data->dialog), title);
	g_free (title);

	_gtk_window_resize_to_fit_screen_height (data->dialog, 500);

	/* Set the signals handlers. */

	g_signal_connect (data->dialog,
			  "destroy",
			  G_CALLBACK (import_dialog_destroy_cb),
			  data);
	g_signal_connect (data->dialog,
			  "delete-event",
			  G_CALLBACK (gtk_true),
			  NULL);
	g_signal_connect (data->dialog,
			  "response",
			  G_CALLBACK (import_dialog_response_cb),
			  data);
	g_signal_connect (GET_WIDGET ("edit_accounts_button"),
			  "clicked",
			  G_CALLBACK (edit_accounts_button_clicked_cb),
			  data);
	g_signal_connect (GET_WIDGET ("account_combobox"),
			  "changed",
			  G_CALLBACK (account_combobox_changed_cb),
			  data);
	g_signal_connect (GET_WIDGET ("album_combobox"),
			  "changed",
			  G_CALLBACK (album_combobox_changed_cb),
			  data);
	g_signal_connect (gth_file_list_get_view (GTH_FILE_LIST (data->file_list)),
			  "file-selection-changed",
			  G_CALLBACK (file_list_selection_changed_cb),
			  data);

	update_selection_status (data);
	gth_import_preferences_dialog_set_event (GTH_IMPORT_PREFERENCES_DIALOG (data->preferences_dialog), "");

	data->service = facebook_service_new (data->cancellable,
					      GTK_WIDGET (data->browser),
					      data->dialog);
	g_signal_connect (data->service,
			  "account-ready",
			  G_CALLBACK (authentication_ready_cb),
			  data);
	g_signal_connect (data->service,
			  "accounts-changed",
			  G_CALLBACK (authentication_accounts_changed_cb),
			  data);

	data->progress_dialog = gth_progress_dialog_new (GTK_WINDOW (data->browser));
	gth_progress_dialog_add_task (GTH_PROGRESS_DIALOG (data->progress_dialog), GTH_TASK (data->service));

	web_service_autoconnect (WEB_SERVICE (data->service));
}
