/*
 * e-mail-attachment-handler.c
 *
 * This program 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 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-mail-attachment-handler.h"

#include <glib/gi18n.h>

#include "mail/e-mail-backend.h"
#include "mail/em-composer-utils.h"

#define E_MAIL_ATTACHMENT_HANDLER_GET_PRIVATE(obj) \
	(G_TYPE_INSTANCE_GET_PRIVATE \
	((obj), E_TYPE_MAIL_ATTACHMENT_HANDLER, EMailAttachmentHandlerPrivate))

struct _EMailAttachmentHandlerPrivate {
	EMailBackend *backend;
};

static gpointer parent_class;
static GType mail_attachment_handler_type;

static const gchar *ui =
"<ui>"
"  <popup name='context'>"
"    <placeholder name='custom-actions'>"
"      <menuitem action='mail-reply-sender'/>"
"      <menuitem action='mail-reply-all'/>"
"      <menuitem action='mail-forward'/>"
"    </placeholder>"
"  </popup>"
"</ui>";

/* Note: Do not use the info field. */
static GtkTargetEntry target_table[] = {
	{ (gchar *) "message/rfc822",	0, 0 },
	{ (gchar *) "x-uid-list",	0, 0 }
};

static CamelMimeMessage *
mail_attachment_handler_get_selected_message (EAttachmentHandler *handler)
{
	EAttachment *attachment;
	EAttachmentView *view;
	CamelMimePart *mime_part;
	CamelMimeMessage *message = NULL;
	CamelDataWrapper *outer_wrapper;
	CamelContentType *outer_content_type;
	CamelDataWrapper *inner_wrapper;
	CamelContentType *inner_content_type;
	GList *selected;
	gboolean inner_and_outer_content_types_match;

	view = e_attachment_handler_get_view (handler);

	selected = e_attachment_view_get_selected_attachments (view);
	g_return_val_if_fail (g_list_length (selected) == 1, NULL);

	attachment = E_ATTACHMENT (selected->data);
	mime_part = e_attachment_ref_mime_part (attachment);

	outer_wrapper =
		camel_medium_get_content (CAMEL_MEDIUM (mime_part));
	outer_content_type =
		camel_data_wrapper_get_mime_type_field (outer_wrapper);

	if (!camel_content_type_is (outer_content_type, "message", "rfc822"))
		goto exit;

	inner_wrapper =
		camel_medium_get_content (CAMEL_MEDIUM (outer_wrapper));
	inner_content_type =
		camel_data_wrapper_get_mime_type_field (inner_wrapper);

	inner_and_outer_content_types_match =
		camel_content_type_is (
			inner_content_type,
			outer_content_type->type,
			outer_content_type->subtype);

	if (!inner_and_outer_content_types_match) {
		CamelStream *mem;
		gboolean success;

		/* Create a message copy in case the inner content
		 * type doesn't match the mime_part's content type,
		 * which can happen for multipart/digest, where it
		 * confuses the formatter on reply, which skips all
		 * rfc822 subparts. */
		mem = camel_stream_mem_new ();
		camel_data_wrapper_write_to_stream_sync (
			CAMEL_DATA_WRAPPER (outer_wrapper), mem, NULL, NULL);

		g_seekable_seek (
			G_SEEKABLE (mem), 0, G_SEEK_SET, NULL, NULL);
		message = camel_mime_message_new ();
		success = camel_data_wrapper_construct_from_stream_sync (
			CAMEL_DATA_WRAPPER (message), mem, NULL, NULL);
		if (!success)
			g_clear_object (&message);

		g_object_unref (mem);
	}

exit:
	if (message == NULL)
		message = g_object_ref (outer_wrapper);

	g_clear_object (&mime_part);

	g_list_free_full (selected, (GDestroyNotify) g_object_unref);

	return message;
}

static void
mail_attachment_handler_forward (GtkAction *action,
                                 EAttachmentHandler *handler)
{
	EMailAttachmentHandlerPrivate *priv;
	GSettings *settings;
	EMailForwardStyle style;
	CamelMimeMessage *message;

	priv = E_MAIL_ATTACHMENT_HANDLER_GET_PRIVATE (handler);

	message = mail_attachment_handler_get_selected_message (handler);
	g_return_if_fail (message != NULL);

	settings = g_settings_new ("org.gnome.evolution.mail");
	style = g_settings_get_enum (settings, "forward-style-name");
	g_object_unref (settings);

	em_utils_forward_message (priv->backend, message, style, NULL, NULL);

	g_object_unref (message);
}

static void
mail_attachment_handler_reply (EAttachmentHandler *handler,
                               EMailReplyType reply_type)
{
	EMailAttachmentHandlerPrivate *priv;
	GSettings *settings;
	EMailReplyStyle style;
	CamelMimeMessage *message;
	EShellBackend *shell_backend;
	EShell *shell;

	priv = E_MAIL_ATTACHMENT_HANDLER_GET_PRIVATE (handler);

	message = mail_attachment_handler_get_selected_message (handler);
	g_return_if_fail (message != NULL);

	settings = g_settings_new ("org.gnome.evolution.mail");
	style = g_settings_get_enum (settings, "reply-style-name");
	g_object_unref (settings);

	shell_backend = E_SHELL_BACKEND (priv->backend);
	shell = e_shell_backend_get_shell (shell_backend);

	em_utils_reply_to_message (
		shell, message, NULL, NULL, reply_type, style, NULL, NULL);

	g_object_unref (message);
}

static void
mail_attachment_handler_reply_all (GtkAction *action,
                                   EAttachmentHandler *handler)
{
	mail_attachment_handler_reply (handler, E_MAIL_REPLY_TO_ALL);
}

static void
mail_attachment_handler_reply_sender (GtkAction *action,
                                      EAttachmentHandler *handler)
{
	mail_attachment_handler_reply (handler, E_MAIL_REPLY_TO_SENDER);
}

static GtkActionEntry standard_entries[] = {

	{ "mail-forward",
	  "mail-forward",
	  N_("_Forward"),
	  NULL,
	  NULL,  /* XXX Add a tooltip! */
	  G_CALLBACK (mail_attachment_handler_forward) },

	{ "mail-reply-all",
	  "mail-reply-all",
	  N_("Reply to _All"),
	  NULL,
	  NULL,  /* XXX Add a tooltip! */
	  G_CALLBACK (mail_attachment_handler_reply_all) },

	{ "mail-reply-sender",
	  "mail-reply-sender",
	  N_("_Reply to Sender"),
	  NULL,
	  NULL,  /* XXX Add a tooltip! */
	  G_CALLBACK (mail_attachment_handler_reply_sender) }
};

static void
mail_attachment_handler_message_rfc822 (EAttachmentView *view,
                                        GdkDragContext *drag_context,
                                        gint x,
                                        gint y,
                                        GtkSelectionData *selection_data,
                                        guint info,
                                        guint time,
                                        EAttachmentHandler *handler)
{
	static GdkAtom atom = GDK_NONE;
	EAttachmentStore *store;
	EAttachment *attachment;
	CamelMimeMessage *message;
	CamelDataWrapper *wrapper;
	CamelStream *stream;
	const gchar *data;
	gboolean success = FALSE;
	gpointer parent;
	gint length;

	if (G_UNLIKELY (atom == GDK_NONE))
		atom = gdk_atom_intern_static_string ("message/rfc822");

	if (gtk_selection_data_get_target (selection_data) != atom)
		return;

	g_signal_stop_emission_by_name (view, "drag-data-received");

	data = (const gchar *) gtk_selection_data_get_data (selection_data);
	length = gtk_selection_data_get_length (selection_data);

	stream = camel_stream_mem_new ();
	camel_stream_write (stream, data, length, NULL, NULL);
	g_seekable_seek (G_SEEKABLE (stream), 0, G_SEEK_SET, NULL, NULL);

	message = camel_mime_message_new ();
	wrapper = CAMEL_DATA_WRAPPER (message);

	if (!camel_data_wrapper_construct_from_stream_sync (
		wrapper, stream, NULL, NULL))
		goto exit;

	store = e_attachment_view_get_store (view);

	parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
	parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

	attachment = e_attachment_new_for_message (message);
	e_attachment_store_add_attachment (store, attachment);
	e_attachment_load_async (
		attachment, (GAsyncReadyCallback)
		e_attachment_load_handle_error, parent);
	g_object_unref (attachment);

	success = TRUE;

exit:
	g_object_unref (message);
	g_object_unref (stream);

	gtk_drag_finish (drag_context, success, FALSE, time);
}

static void
mail_attachment_handler_x_uid_list (EAttachmentView *view,
                                    GdkDragContext *drag_context,
                                    gint x,
                                    gint y,
                                    GtkSelectionData *selection_data,
                                    guint info,
                                    guint time,
                                    EAttachmentHandler *handler)
{
	static GdkAtom atom = GDK_NONE;
	EMailAttachmentHandlerPrivate *priv;
	CamelDataWrapper *wrapper;
	CamelMimeMessage *message;
	CamelMultipart *multipart;
	CamelMimePart *mime_part;
	CamelFolder *folder = NULL;
	EAttachment *attachment;
	EAttachmentStore *store;
	EMailSession *session;
	GPtrArray *uids;
	const gchar *data;
	const gchar *cp, *end;
	gchar *description;
	gpointer parent;
	gint length;
	guint ii;
	GError *local_error = NULL;

	if (G_UNLIKELY (atom == GDK_NONE))
		atom = gdk_atom_intern_static_string ("x-uid-list");

	if (gtk_selection_data_get_target (selection_data) != atom)
		return;

	store = e_attachment_view_get_store (view);
	priv = E_MAIL_ATTACHMENT_HANDLER_GET_PRIVATE (handler);

	parent = gtk_widget_get_toplevel (GTK_WIDGET (view));
	parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

	uids = g_ptr_array_new ();

	data = (const gchar *) gtk_selection_data_get_data (selection_data);
	length = gtk_selection_data_get_length (selection_data);

	/* The UID list is delimited by NUL characters.
	 * Brilliant.  So we can't use g_strsplit(). */

	cp = data;
	end = data + length;

	while (cp < end) {
		const gchar *start = cp;

		while (cp < end && *cp != '\0')
			cp++;

		/* Skip the first string. */
		if (start > data)
			g_ptr_array_add (uids, g_strndup (start, cp - start));

		cp++;
	}

	if (uids->len == 0)
		goto exit;

	session = e_mail_backend_get_session (priv->backend);

	/* The first string is the folder URI. */
	/* FIXME Not passing a GCancellable here. */
	folder = e_mail_session_uri_to_folder_sync (
		session, data, 0, NULL, &local_error);
	if (folder == NULL)
		goto exit;

	/* Handle one message. */
	if (uids->len == 1) {
		const gchar *message_uid;

		message_uid = g_ptr_array_index (uids, 0);

		/* FIXME Not passing a GCancellable here. */
		message = camel_folder_get_message_sync (
			folder, message_uid, NULL, &local_error);
		if (message == NULL)
			goto exit;

		attachment = e_attachment_new_for_message (message);
		e_attachment_store_add_attachment (store, attachment);
		e_attachment_load_async (
			attachment, (GAsyncReadyCallback)
			e_attachment_load_handle_error, parent);
		g_object_unref (attachment);

		g_object_unref (message);
		goto exit;
	}

	/* Build a multipart/digest message out of the UIDs. */

	multipart = camel_multipart_new ();
	wrapper = CAMEL_DATA_WRAPPER (multipart);
	camel_data_wrapper_set_mime_type (wrapper, "multipart/digest");
	camel_multipart_set_boundary (multipart, NULL);

	for (ii = 0; ii < uids->len; ii++) {
		/* FIXME Not passing a GCancellable here. */
		message = camel_folder_get_message_sync (
			folder, uids->pdata[ii], NULL, &local_error);
		if (message == NULL) {
			g_object_unref (multipart);
			goto exit;
		}

		mime_part = camel_mime_part_new ();
		wrapper = CAMEL_DATA_WRAPPER (message);
		camel_mime_part_set_disposition (mime_part, "inline");
		camel_medium_set_content (
			CAMEL_MEDIUM (mime_part), wrapper);
		camel_mime_part_set_content_type (mime_part, "message/rfc822");
		camel_multipart_add_part (multipart, mime_part);
		g_object_unref (mime_part);

		g_object_unref (message);
	}

	mime_part = camel_mime_part_new ();
	wrapper = CAMEL_DATA_WRAPPER (multipart);
	camel_medium_set_content (CAMEL_MEDIUM (mime_part), wrapper);

	description = g_strdup_printf (
		ngettext (
			"%d attached message",
			"%d attached messages",
			uids->len),
		uids->len);
	camel_mime_part_set_description (mime_part, description);
	g_free (description);

	attachment = e_attachment_new ();
	e_attachment_set_mime_part (attachment, mime_part);
	e_attachment_store_add_attachment (store, attachment);
	e_attachment_load_async (
		attachment, (GAsyncReadyCallback)
		e_attachment_load_handle_error, parent);
	g_object_unref (attachment);

	g_object_unref (mime_part);
	g_object_unref (multipart);

exit:
	if (local_error != NULL) {
		const gchar *folder_name = data;

		if (folder != NULL)
			folder_name = camel_folder_get_display_name (folder);

		e_alert_run_dialog_for_args (
			parent, "mail-composer:attach-nomessages",
			folder_name, local_error->message, NULL);

		g_clear_error (&local_error);
	}

	if (folder != NULL)
		g_object_unref (folder);

	g_ptr_array_free (uids, TRUE);

	g_signal_stop_emission_by_name (view, "drag-data-received");
}

static void
mail_attachment_handler_update_actions (EAttachmentView *view,
                                        EAttachmentHandler *handler)
{
	EAttachment *attachment;
	CamelMimePart *mime_part;
	GtkActionGroup *action_group;
	GList *selected;
	gboolean visible = FALSE;

	selected = e_attachment_view_get_selected_attachments (view);

	if (g_list_length (selected) != 1)
		goto exit;

	attachment = E_ATTACHMENT (selected->data);

	if (e_attachment_get_loading (attachment) ||
	    e_attachment_get_saving (attachment))
		goto exit;

	mime_part = e_attachment_ref_mime_part (attachment);

	if (mime_part != NULL) {
		CamelMedium *medium;
		CamelDataWrapper *content;

		medium = CAMEL_MEDIUM (mime_part);
		content = camel_medium_get_content (medium);
		visible = CAMEL_IS_MIME_MESSAGE (content);

		g_object_unref (mime_part);
	}

exit:
	action_group = e_attachment_view_get_action_group (view, "mail");
	gtk_action_group_set_visible (action_group, visible);

	g_list_foreach (selected, (GFunc) g_object_unref, NULL);
	g_list_free (selected);
}

static void
mail_attachment_handler_dispose (GObject *object)
{
	EMailAttachmentHandlerPrivate *priv;

	priv = E_MAIL_ATTACHMENT_HANDLER_GET_PRIVATE (object);

	g_clear_object (&priv->backend);

	/* Chain up to parent's dispose() method. */
	G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
mail_attachment_handler_constructed (GObject *object)
{
	EMailAttachmentHandlerPrivate *priv;
	EShell *shell;
	EShellBackend *shell_backend;
	EAttachmentHandler *handler;
	EAttachmentView *view;
	GtkActionGroup *action_group;
	GtkUIManager *ui_manager;
	GError *error = NULL;

	handler = E_ATTACHMENT_HANDLER (object);
	priv = E_MAIL_ATTACHMENT_HANDLER_GET_PRIVATE (object);

	/* Chain up to parent's constructed() method. */
	G_OBJECT_CLASS (parent_class)->constructed (object);

	shell = e_shell_get_default ();
	shell_backend = e_shell_get_backend_by_name (shell, "mail");
	priv->backend = g_object_ref (shell_backend);

	view = e_attachment_handler_get_view (handler);

	action_group = e_attachment_view_add_action_group (view, "mail");
	gtk_action_group_add_actions (
		action_group, standard_entries,
		G_N_ELEMENTS (standard_entries), handler);

	ui_manager = e_attachment_view_get_ui_manager (view);
	gtk_ui_manager_add_ui_from_string (ui_manager, ui, -1, &error);

	if (error != NULL) {
		g_warning ("%s", error->message);
		g_error_free (error);
	}

	g_signal_connect (
		view, "update-actions",
		G_CALLBACK (mail_attachment_handler_update_actions),
		handler);

	g_signal_connect (
		view, "drag-data-received",
		G_CALLBACK (mail_attachment_handler_message_rfc822),
		handler);

	g_signal_connect (
		view, "drag-data-received",
		G_CALLBACK (mail_attachment_handler_x_uid_list),
		handler);
}

static GdkDragAction
mail_attachment_handler_get_drag_actions (EAttachmentHandler *handler)
{
	return GDK_ACTION_COPY;
}

static const GtkTargetEntry *
mail_attachment_handler_get_target_table (EAttachmentHandler *handler,
                                          guint *n_targets)
{
	if (n_targets != NULL)
		*n_targets = G_N_ELEMENTS (target_table);

	return target_table;
}

static void
mail_attachment_handler_class_init (EMailAttachmentHandlerClass *class)
{
	GObjectClass *object_class;
	EAttachmentHandlerClass *handler_class;

	parent_class = g_type_class_peek_parent (class);
	g_type_class_add_private (class, sizeof (EMailAttachmentHandlerPrivate));

	object_class = G_OBJECT_CLASS (class);
	object_class->dispose = mail_attachment_handler_dispose;
	object_class->constructed = mail_attachment_handler_constructed;

	handler_class = E_ATTACHMENT_HANDLER_CLASS (class);
	handler_class->get_drag_actions = mail_attachment_handler_get_drag_actions;
	handler_class->get_target_table = mail_attachment_handler_get_target_table;
}

static void
mail_attachment_handler_init (EMailAttachmentHandler *handler)
{
	handler->priv = E_MAIL_ATTACHMENT_HANDLER_GET_PRIVATE (handler);
}

GType
e_mail_attachment_handler_get_type (void)
{
	return mail_attachment_handler_type;
}

void
e_mail_attachment_handler_register_type (GTypeModule *type_module)
{
	static const GTypeInfo type_info = {
		sizeof (EMailAttachmentHandlerClass),
		(GBaseInitFunc) NULL,
		(GBaseFinalizeFunc) NULL,
		(GClassInitFunc) mail_attachment_handler_class_init,
		(GClassFinalizeFunc) NULL,
		NULL,  /* class_data */
		sizeof (EMailAttachmentHandler),
		0,     /* n_preallocs */
		(GInstanceInitFunc) mail_attachment_handler_init,
		NULL   /* value_table */
	};

	mail_attachment_handler_type = g_type_module_register_type (
		type_module, E_TYPE_ATTACHMENT_HANDLER,
		"EMailAttachmentHandler", &type_info, 0);
}