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

/*
 * 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.
 *
 * 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 Lesser General Public License
 * along with this 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-composer-private.h"
#include "e-composer-from-header.h"
#include "e-composer-spell-header.h"
#include "e-util/e-util-private.h"

/* Initial height of the picture gallery. */
#define GALLERY_INITIAL_HEIGHT 150

static void
composer_setup_charset_menu (EMsgComposer *composer)
{
	EHTMLEditor *editor;
	GtkUIManager *ui_manager;
	const gchar *path;
	GList *list;
	guint merge_id;

	editor = e_msg_composer_get_editor (composer);
	ui_manager = e_html_editor_get_ui_manager (editor);
	path = "/main-menu/options-menu/charset-menu";
	merge_id = gtk_ui_manager_new_merge_id (ui_manager);

	list = gtk_action_group_list_actions (composer->priv->charset_actions);
	list = g_list_sort (list, (GCompareFunc) e_action_compare_by_label);

	while (list != NULL) {
		GtkAction *action = list->data;

		gtk_ui_manager_add_ui (
			ui_manager, merge_id, path,
			gtk_action_get_name (action),
			gtk_action_get_name (action),
			GTK_UI_MANAGER_AUTO, FALSE);

		list = g_list_delete_link (list, list);
	}

	gtk_ui_manager_ensure_update (ui_manager);
}

static void
composer_update_gallery_visibility (EMsgComposer *composer)
{
	EHTMLEditor *editor;
	EHTMLEditorView *view;
	GtkToggleAction *toggle_action;
	gboolean gallery_active;
	gboolean is_html;

	editor = e_msg_composer_get_editor (composer);
	view = e_html_editor_get_view (editor);
	is_html = e_html_editor_view_get_html_mode (view);

	toggle_action = GTK_TOGGLE_ACTION (ACTION (PICTURE_GALLERY));
	gallery_active = gtk_toggle_action_get_active (toggle_action);

	if (is_html && gallery_active) {
		gtk_widget_show (composer->priv->gallery_scrolled_window);
		gtk_widget_show (composer->priv->gallery_icon_view);
	} else {
		gtk_widget_hide (composer->priv->gallery_scrolled_window);
		gtk_widget_hide (composer->priv->gallery_icon_view);
	}
}

void
e_composer_private_constructed (EMsgComposer *composer)
{
	EMsgComposerPrivate *priv = composer->priv;
	EFocusTracker *focus_tracker;
	EComposerHeader *header;
	EShell *shell;
	EClientCache *client_cache;
	EHTMLEditor *editor;
	EHTMLEditorView *view;
	GtkUIManager *ui_manager;
	GtkAction *action;
	GtkWidget *container;
	GtkWidget *widget;
	GtkWidget *send_widget;
	GtkWindow *window;
	GSettings *settings;
	const gchar *path;
	gchar *filename, *gallery_path;
	gint ii;
	GError *error = NULL;

	editor = e_msg_composer_get_editor (composer);
	ui_manager = e_html_editor_get_ui_manager (editor);
	view = e_html_editor_get_view (editor);

	settings = e_util_ref_settings ("org.gnome.evolution.mail");

	shell = e_msg_composer_get_shell (composer);
	client_cache = e_shell_get_client_cache (shell);

	/* Each composer window gets its own window group. */
	window = GTK_WINDOW (composer);
	priv->window_group = gtk_window_group_new ();
	gtk_window_group_add_window (priv->window_group, window);

	priv->async_actions = gtk_action_group_new ("async");
	priv->charset_actions = gtk_action_group_new ("charset");
	priv->composer_actions = gtk_action_group_new ("composer");

	priv->extra_hdr_names = g_ptr_array_new ();
	priv->extra_hdr_values = g_ptr_array_new ();

	priv->charset = e_composer_get_default_charset ();

	priv->is_from_new_message = FALSE;
	priv->set_signature_from_message = FALSE;
	priv->disable_signature = FALSE;
	priv->busy = FALSE;
	priv->saved_editable = FALSE;
	priv->drop_occured = FALSE;
	priv->dnd_is_uri = FALSE;
	priv->check_if_signature_is_changed = FALSE;
	priv->ignore_next_signature_change = FALSE;
	priv->dnd_history_saved = FALSE;

	priv->focused_entry = NULL;

	e_composer_actions_init (composer);

	filename = e_composer_find_data_file ("evolution-composer.ui");
	gtk_ui_manager_add_ui_from_file (ui_manager, filename, &error);
	g_free (filename);

	/* We set the send button as important to have a label */
	path = "/main-toolbar/pre-main-toolbar/send";
	send_widget = gtk_ui_manager_get_widget (ui_manager, path);
	gtk_tool_item_set_is_important (GTK_TOOL_ITEM (send_widget), TRUE);

	composer_setup_charset_menu (composer);

	if (error != NULL) {
		/* Henceforth, bad things start happening. */
		g_critical ("%s", error->message);
		g_clear_error (&error);
	}

	/* Configure an EFocusTracker to manage selection actions. */

	focus_tracker = e_focus_tracker_new (GTK_WINDOW (composer));

	action = e_html_editor_get_action (editor, "cut");
	e_focus_tracker_set_cut_clipboard_action (focus_tracker, action);

	action = e_html_editor_get_action (editor, "copy");
	e_focus_tracker_set_copy_clipboard_action (focus_tracker, action);

	action = e_html_editor_get_action (editor, "paste");
	e_focus_tracker_set_paste_clipboard_action (focus_tracker, action);

	action = e_html_editor_get_action (editor, "select-all");
	e_focus_tracker_set_select_all_action (focus_tracker, action);

	action = e_html_editor_get_action (editor, "undo");
	e_focus_tracker_set_undo_action (focus_tracker, action);

	action = e_html_editor_get_action (editor, "redo");
	e_focus_tracker_set_redo_action (focus_tracker, action);

	priv->focus_tracker = focus_tracker;

	widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
	gtk_container_add (GTK_CONTAINER (composer), widget);
	gtk_widget_show (widget);

	container = widget;

	/* Construct the main menu and toolbar. */

	widget = e_html_editor_get_managed_widget (editor, "/main-menu");
	gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
	gtk_widget_show (widget);

	widget = e_html_editor_get_managed_widget (editor, "/main-toolbar");
	gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
	gtk_widget_show (widget);

	/* Construct the header table. */

	widget = e_composer_header_table_new (client_cache);
	gtk_container_set_border_width (GTK_CONTAINER (widget), 6);
	gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
	priv->header_table = g_object_ref (widget);
	gtk_widget_show (widget);

	header = e_composer_header_table_get_header (
		E_COMPOSER_HEADER_TABLE (widget),
		E_COMPOSER_HEADER_SUBJECT);
	e_binding_bind_property (
		view, "spell-checker",
		header->input_widget, "spell-checker",
		G_BINDING_SYNC_CREATE);

	/* Construct the editing toolbars.  We'll have to reparent
	 * the embedded EHTMLEditorView a little further down. */

	widget = GTK_WIDGET (editor);
	gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
	gtk_widget_show (widget);

	/* Construct the attachment paned. */

	widget = e_attachment_paned_new ();
	gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
	priv->attachment_paned = g_object_ref_sink (widget);
	gtk_widget_show (widget);

	e_binding_bind_property (
		view, "editable",
		widget, "sensitive",
		G_BINDING_SYNC_CREATE);

	container = e_attachment_paned_get_content_area (
		E_ATTACHMENT_PANED (priv->attachment_paned));

	widget = gtk_paned_new (GTK_ORIENTATION_VERTICAL);
	gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
	gtk_widget_show (widget);

	container = widget;

	widget = gtk_scrolled_window_new (NULL, NULL);
	gtk_scrolled_window_set_policy (
		GTK_SCROLLED_WINDOW (widget),
		GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
	gtk_widget_set_size_request (widget, -1, GALLERY_INITIAL_HEIGHT);
	gtk_paned_pack1 (GTK_PANED (container), widget, FALSE, FALSE);
	priv->gallery_scrolled_window = g_object_ref (widget);
	gtk_widget_show (widget);

	/* Reparent the scrolled window containing the web view
	 * widget into the content area of the top attachment pane. */

	widget = GTK_WIDGET (view);
	widget = gtk_widget_get_parent (widget);
	gtk_widget_reparent (widget, container);

	/* Construct the picture gallery. */

	container = priv->gallery_scrolled_window;

	/* FIXME This should be an EMsgComposer property. */
	gallery_path = g_settings_get_string (
		settings, "composer-gallery-path");
	widget = e_picture_gallery_new (gallery_path);
	gtk_container_add (GTK_CONTAINER (container), widget);
	priv->gallery_icon_view = g_object_ref_sink (widget);
	g_free (gallery_path);

	e_signal_connect_notify_swapped (
		view, "notify::html-mode",
		G_CALLBACK (composer_update_gallery_visibility), composer);

	g_signal_connect_swapped (
		ACTION (PICTURE_GALLERY), "toggled",
		G_CALLBACK (composer_update_gallery_visibility), composer);

	/* Initial sync */
	composer_update_gallery_visibility (composer);

	/* Bind headers to their corresponding actions. */

	for (ii = 0; ii < E_COMPOSER_NUM_HEADERS; ii++) {
		EComposerHeaderTable *table;
		EComposerHeader *header;
		GtkAction *action;

		table = E_COMPOSER_HEADER_TABLE (priv->header_table);
		header = e_composer_header_table_get_header (table, ii);

		switch (ii) {
			case E_COMPOSER_HEADER_FROM:
				e_widget_undo_attach (
					GTK_WIDGET (e_composer_from_header_get_name_entry (E_COMPOSER_FROM_HEADER (header))),
					focus_tracker);
				e_widget_undo_attach (
					GTK_WIDGET (e_composer_from_header_get_address_entry (E_COMPOSER_FROM_HEADER (header))),
					focus_tracker);

				action = ACTION (VIEW_FROM_OVERRIDE);
				e_binding_bind_property (
					header, "override-visible",
					action, "active",
					G_BINDING_BIDIRECTIONAL |
					G_BINDING_SYNC_CREATE);
				continue;

			case E_COMPOSER_HEADER_BCC:
				action = ACTION (VIEW_BCC);
				break;

			case E_COMPOSER_HEADER_CC:
				action = ACTION (VIEW_CC);
				break;

			case E_COMPOSER_HEADER_REPLY_TO:
				action = ACTION (VIEW_REPLY_TO);
				e_widget_undo_attach (
					GTK_WIDGET (header->input_widget),
					focus_tracker);
				break;

			case E_COMPOSER_HEADER_SUBJECT:
				e_widget_undo_attach (
					GTK_WIDGET (header->input_widget),
					focus_tracker);
				continue;

			default:
				continue;
		}

		e_binding_bind_property (
			header, "sensitive",
			action, "sensitive",
			G_BINDING_BIDIRECTIONAL |
			G_BINDING_SYNC_CREATE);

		e_binding_bind_property (
			header, "visible",
			action, "active",
			G_BINDING_BIDIRECTIONAL |
			G_BINDING_SYNC_CREATE);
	}

	/* Disable actions that start asynchronous activities while an
	 * asynchronous activity is in progress. We enforce this with
	 * a simple inverted binding to EMsgComposer's "busy" property. */

	e_binding_bind_property (
		composer, "busy",
		priv->async_actions, "sensitive",
		G_BINDING_SYNC_CREATE |
		G_BINDING_INVERT_BOOLEAN);

	e_binding_bind_property (
		composer, "busy",
		priv->header_table, "sensitive",
		G_BINDING_SYNC_CREATE |
		G_BINDING_INVERT_BOOLEAN);

	g_object_unref (settings);
}

void
e_composer_private_dispose (EMsgComposer *composer)
{
	if (composer->priv->shell != NULL) {
		g_object_remove_weak_pointer (
			G_OBJECT (composer->priv->shell),
			&composer->priv->shell);
		composer->priv->shell = NULL;
	}

	if (composer->priv->editor != NULL) {
		g_object_unref (composer->priv->editor);
		composer->priv->editor = NULL;
	}

	if (composer->priv->header_table != NULL) {
		g_object_unref (composer->priv->header_table);
		composer->priv->header_table = NULL;
	}

	if (composer->priv->attachment_paned != NULL) {
		g_object_unref (composer->priv->attachment_paned);
		composer->priv->attachment_paned = NULL;
	}

	if (composer->priv->focus_tracker != NULL) {
		g_object_unref (composer->priv->focus_tracker);
		composer->priv->focus_tracker = NULL;
	}

	if (composer->priv->window_group != NULL) {
		g_object_unref (composer->priv->window_group);
		composer->priv->window_group = NULL;
	}

	if (composer->priv->async_actions != NULL) {
		g_object_unref (composer->priv->async_actions);
		composer->priv->async_actions = NULL;
	}

	if (composer->priv->charset_actions != NULL) {
		g_object_unref (composer->priv->charset_actions);
		composer->priv->charset_actions = NULL;
	}

	if (composer->priv->composer_actions != NULL) {
		g_object_unref (composer->priv->composer_actions);
		composer->priv->composer_actions = NULL;
	}

	if (composer->priv->gallery_scrolled_window != NULL) {
		g_object_unref (composer->priv->gallery_scrolled_window);
		composer->priv->gallery_scrolled_window = NULL;
	}

	if (composer->priv->redirect != NULL) {
		g_object_unref (composer->priv->redirect);
		composer->priv->redirect = NULL;
	}
}

void
e_composer_private_finalize (EMsgComposer *composer)
{
	GPtrArray *array;

	array = composer->priv->extra_hdr_names;
	g_ptr_array_foreach (array, (GFunc) g_free, NULL);
	g_ptr_array_free (array, TRUE);

	array = composer->priv->extra_hdr_values;
	g_ptr_array_foreach (array, (GFunc) g_free, NULL);
	g_ptr_array_free (array, TRUE);

	g_free (composer->priv->charset);
	g_free (composer->priv->mime_type);
	g_free (composer->priv->mime_body);
}

gchar *
e_composer_find_data_file (const gchar *basename)
{
	gchar *filename;

	g_return_val_if_fail (basename != NULL, NULL);

	/* Support running directly from the source tree. */
	filename = g_build_filename (".", basename, NULL);
	if (g_file_test (filename, G_FILE_TEST_EXISTS))
		return filename;
	g_free (filename);

	/* XXX This is kinda broken. */
	filename = g_build_filename (EVOLUTION_UIDIR, basename, NULL);
	if (g_file_test (filename, G_FILE_TEST_EXISTS))
		return filename;
	g_free (filename);

	g_critical ("Could not locate '%s'", basename);

	return NULL;
}

gchar *
e_composer_get_default_charset (void)
{
	GSettings *settings;
	gchar *charset;

	settings = e_util_ref_settings ("org.gnome.evolution.mail");

	charset = g_settings_get_string (settings, "composer-charset");

	if (!charset || !*charset) {
		g_free (charset);
		charset = NULL;
	}

	g_object_unref (settings);

	if (!charset)
		charset = g_strdup ("UTF-8");

	return charset;
}

gboolean
e_composer_paste_html (EMsgComposer *composer,
                       GtkClipboard *clipboard)
{
	EHTMLEditor *editor;
	EHTMLEditorView *view;
	EHTMLEditorSelection *editor_selection;
	gchar *html;

	g_return_val_if_fail (E_IS_MSG_COMPOSER (composer), FALSE);
	g_return_val_if_fail (GTK_IS_CLIPBOARD (clipboard), FALSE);

	if (!(html = e_clipboard_wait_for_html (clipboard)))
		return FALSE;

	g_return_val_if_fail (html != NULL, FALSE);

	editor = e_msg_composer_get_editor (composer);
	view = e_html_editor_get_view (editor);
	editor_selection = e_html_editor_view_get_selection (view);
	/* If Web View doesn't have focus, focus it */
	if (!gtk_widget_has_focus (GTK_WIDGET (view)))
		gtk_widget_grab_focus (GTK_WIDGET (view));
	e_html_editor_selection_insert_html (editor_selection, html);

	g_free (html);

	return TRUE;
}

gboolean
e_composer_paste_image (EMsgComposer *composer,
                        GtkClipboard *clipboard)
{
	EHTMLEditor *editor;
	EHTMLEditorView *html_editor_view;
	EAttachmentStore *store;
	EAttachmentView *view;
	GdkPixbuf *pixbuf = NULL;
	gchar *filename = NULL;
	gchar *uri = NULL;
	gboolean success = FALSE;
	GError *error = NULL;

	g_return_val_if_fail (E_IS_MSG_COMPOSER (composer), FALSE);
	g_return_val_if_fail (GTK_IS_CLIPBOARD (clipboard), FALSE);

	view = e_msg_composer_get_attachment_view (composer);
	store = e_attachment_view_get_store (view);

	/* Extract the image data from the clipboard. */
	pixbuf = gtk_clipboard_wait_for_image (clipboard);
	g_return_val_if_fail (pixbuf != NULL, FALSE);

	/* Reserve a temporary file. */
	filename = e_mktemp (NULL);
	if (filename == NULL) {
		g_set_error (
			&error, G_FILE_ERROR,
			g_file_error_from_errno (errno),
			"Could not create temporary file: %s",
			g_strerror (errno));
		goto exit;
	}

	/* Save the pixbuf as a temporary file in image/png format. */
	if (!gdk_pixbuf_save (pixbuf, filename, "png", &error, NULL))
		goto exit;

	/* Convert the filename to a URI. */
	uri = g_filename_to_uri (filename, NULL, &error);
	if (uri == NULL)
		goto exit;

	/* In HTML mode, paste the image into the message body.
	 * In text mode, add the image to the attachment store. */
	editor = e_msg_composer_get_editor (composer);
	html_editor_view = e_html_editor_get_view (editor);
	if (e_html_editor_view_get_html_mode (html_editor_view)) {
		EHTMLEditorSelection *selection;

		selection = e_html_editor_view_get_selection (html_editor_view);
		e_html_editor_selection_insert_image (selection, uri);
		e_html_editor_selection_scroll_to_caret (selection);
	} else {
		EAttachment *attachment;

		attachment = e_attachment_new_for_uri (uri);
		e_attachment_store_add_attachment (store, attachment);
		e_attachment_load_async (
			attachment, (GAsyncReadyCallback)
			e_attachment_load_handle_error, composer);
		g_object_unref (attachment);
	}

	success = TRUE;

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

	g_object_unref (pixbuf);
	g_free (filename);
	g_free (uri);

	return success;
}

gboolean
e_composer_paste_text (EMsgComposer *composer,
                       GtkClipboard *clipboard)
{
	EHTMLEditor *editor;
	EHTMLEditorView *view;
	EHTMLEditorSelection *editor_selection;
	gchar *text;

	g_return_val_if_fail (E_IS_MSG_COMPOSER (composer), FALSE);
	g_return_val_if_fail (GTK_IS_CLIPBOARD (clipboard), FALSE);

	if (!(text = gtk_clipboard_wait_for_text (clipboard)))
		return FALSE;

	editor = e_msg_composer_get_editor (composer);
	view = e_html_editor_get_view (editor);
	editor_selection = e_html_editor_view_get_selection (view);
	/* If WebView doesn't have focus, focus it */
	if (!gtk_widget_has_focus (GTK_WIDGET (view)))
		gtk_widget_grab_focus (GTK_WIDGET (view));

	e_html_editor_selection_insert_text (editor_selection, text);

	g_free (text);

	return TRUE;
}

gboolean
e_composer_paste_uris (EMsgComposer *composer,
                       GtkClipboard *clipboard)
{
	EAttachmentStore *store;
	EAttachmentView *view;
	gchar **uris;
	gint ii;

	g_return_val_if_fail (E_IS_MSG_COMPOSER (composer), FALSE);
	g_return_val_if_fail (GTK_IS_CLIPBOARD (clipboard), FALSE);

	view = e_msg_composer_get_attachment_view (composer);
	store = e_attachment_view_get_store (view);

	/* Extract the URI data from the clipboard. */
	uris = gtk_clipboard_wait_for_uris (clipboard);
	g_return_val_if_fail (uris != NULL, FALSE);

	/* Add the URIs to the attachment store. */
	for (ii = 0; uris[ii] != NULL; ii++) {
		EAttachment *attachment;

		attachment = e_attachment_new_for_uri (uris[ii]);
		e_attachment_store_add_attachment (store, attachment);
		e_attachment_load_async (
			attachment, (GAsyncReadyCallback)
			e_attachment_load_handle_error, composer);
		g_object_unref (attachment);
	}

	return TRUE;
}

gboolean
e_composer_selection_is_base64_uris (EMsgComposer *composer,
                                     GtkSelectionData *selection)
{
	gboolean all_base64_uris = TRUE;
	gchar **uris;
	guint ii;

	g_return_val_if_fail (E_IS_MSG_COMPOSER (composer), FALSE);
	g_return_val_if_fail (selection != NULL, FALSE);

	uris = gtk_selection_data_get_uris (selection);

	if (!uris)
		return FALSE;

	for (ii = 0; uris[ii] != NULL; ii++) {
		if (!((g_str_has_prefix (uris[ii], "data:") || strstr (uris[ii], ";data:"))
		    && strstr (uris[ii], ";base64,"))) {
			all_base64_uris = FALSE;
			break;
		}
	}

	g_strfreev (uris);

	return all_base64_uris;
}

gboolean
e_composer_selection_is_image_uris (EMsgComposer *composer,
                                    GtkSelectionData *selection)
{
	gboolean all_image_uris = TRUE;
	gchar **uris;
	guint ii;

	g_return_val_if_fail (E_IS_MSG_COMPOSER (composer), FALSE);
	g_return_val_if_fail (selection != NULL, FALSE);

	uris = gtk_selection_data_get_uris (selection);

	if (!uris)
		return FALSE;

	for (ii = 0; uris[ii] != NULL; ii++) {
		GFile *file;
		GFileInfo *file_info;
		GdkPixbufLoader *loader;
		const gchar *attribute;
		const gchar *content_type;
		gchar *mime_type = NULL;

		file = g_file_new_for_uri (uris[ii]);
		attribute = G_FILE_ATTRIBUTE_STANDARD_FAST_CONTENT_TYPE;

		/* XXX This blocks, but we're requesting the fast content
		 *     type (which only inspects filenames), so hopefully
		 *     it won't be noticeable.  Also, this is best effort
		 *     so we don't really care if it fails. */
		file_info = g_file_query_info (
			file, attribute, G_FILE_QUERY_INFO_NONE, NULL, NULL);

		if (file_info == NULL) {
			g_object_unref (file);
			all_image_uris = FALSE;
			break;
		}

		content_type = g_file_info_get_attribute_string (
			file_info, attribute);
		mime_type = g_content_type_get_mime_type (content_type);

		g_object_unref (file_info);
		g_object_unref (file);

		if (mime_type == NULL) {
			all_image_uris = FALSE;
			break;
		}

		/* Easy way to determine if a MIME type is a supported
		 * image format: try creating a GdkPixbufLoader for it. */
		loader = gdk_pixbuf_loader_new_with_mime_type (mime_type, NULL);

		g_free (mime_type);

		if (loader == NULL) {
			all_image_uris = FALSE;
			break;
		}

		gdk_pixbuf_loader_close (loader, NULL);
		g_object_unref (loader);
	}

	g_strfreev (uris);

	return all_image_uris;
}

static gboolean
add_signature_delimiter (EMsgComposer *composer)
{
	GSettings *settings;
	gboolean signature_delim;

	/* FIXME This should be an EMsgComposer property. */
	settings = e_util_ref_settings ("org.gnome.evolution.mail");
	signature_delim = !g_settings_get_boolean (
		settings, "composer-no-signature-delim");
	g_object_unref (settings);

	return signature_delim;
}

static gboolean
use_top_signature (EMsgComposer *composer)
{
	GSettings *settings;
	gboolean top_signature;

	/* FIXME This should be an EMsgComposer property. */
	settings = e_util_ref_settings ("org.gnome.evolution.mail");
	top_signature = g_settings_get_boolean (
		settings, "composer-top-signature");
	g_object_unref (settings);

	return top_signature;
}

static WebKitDOMElement *
prepare_paragraph (EHTMLEditorSelection *selection,
                   WebKitDOMDocument *document)
{
	WebKitDOMElement *br, *paragraph;

	paragraph = e_html_editor_selection_get_paragraph_element (
		selection, document, -1, 0);
	webkit_dom_element_set_id (paragraph, "-x-evo-input-start");
	br = webkit_dom_document_create_element (document, "BR", NULL);
	webkit_dom_node_append_child (
		WEBKIT_DOM_NODE (paragraph), WEBKIT_DOM_NODE (br), NULL);

	return paragraph;
}

static WebKitDOMElement *
prepare_top_signature_spacer (EHTMLEditorSelection *selection,
                              WebKitDOMDocument *document)
{
	WebKitDOMElement *element;

	element = prepare_paragraph (selection, document);
	webkit_dom_element_remove_attribute (element, "id");
	element_add_class (element, "-x-evo-top-signature-spacer");

	return element;
}

static void
composer_move_caret (EMsgComposer *composer)
{
	EHTMLEditor *editor;
	EHTMLEditorView *view;
	EHTMLEditorSelection *editor_selection;
	GSettings *settings;
	gboolean start_bottom, top_signature;
	gboolean is_message_from_draft;
	gboolean is_message_from_edit_as_new;
	gboolean has_paragraphs_in_body = TRUE;
	WebKitDOMDocument *document;
	WebKitDOMElement *element, *signature;
	WebKitDOMHTMLElement *body;
	WebKitDOMNodeList *list;

	/* When there is an option composer-reply-start-bottom set we have
	 * to move the caret between reply and signature. */
	settings = e_util_ref_settings ("org.gnome.evolution.mail");
	start_bottom = g_settings_get_boolean (settings, "composer-reply-start-bottom");
	g_object_unref (settings);

	editor = e_msg_composer_get_editor (composer);
	view = e_html_editor_get_view (editor);
	editor_selection = e_html_editor_view_get_selection (view);
	is_message_from_draft = e_html_editor_view_is_message_from_draft (view);
	is_message_from_edit_as_new =
		e_html_editor_view_is_message_from_edit_as_new (view);

	top_signature =
		use_top_signature (composer) &&
		!is_message_from_edit_as_new &&
		!composer->priv->is_from_new_message;

	document = webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (view));

	body = webkit_dom_document_get_body (document);
	webkit_dom_element_set_attribute (
		WEBKIT_DOM_ELEMENT (body), "data-message", "", NULL);

	/* If editing message as new don't handle with caret */
	if (is_message_from_edit_as_new || is_message_from_draft) {
		if (is_message_from_edit_as_new)
			webkit_dom_element_set_attribute (
				WEBKIT_DOM_ELEMENT (body),
				"data-edit-as-new",
				"",
				NULL);

		if (is_message_from_edit_as_new && !is_message_from_draft) {
			element = WEBKIT_DOM_ELEMENT (body);
			e_html_editor_selection_block_selection_changed (editor_selection);
			goto move_caret;
		} else
			e_html_editor_selection_scroll_to_caret (editor_selection);

		return;
	}

	e_html_editor_selection_block_selection_changed (editor_selection);

	/* When the new message is written from the beginning - note it into body */
	if (composer->priv->is_from_new_message)
		webkit_dom_element_set_attribute (
			WEBKIT_DOM_ELEMENT (body), "data-new-message", "", NULL);

	list = webkit_dom_document_get_elements_by_class_name (document, "-x-evo-paragraph");
	signature = webkit_dom_document_query_selector (document, ".-x-evo-signature-wrapper", NULL);
	/* Situation when wrapped paragraph is just in signature and not in message body */
	if (webkit_dom_node_list_get_length (list) == 1)
		if (signature && webkit_dom_element_query_selector (signature, ".-x-evo-paragraph", NULL))
			has_paragraphs_in_body = FALSE;

	/*
	 *
	 * Keeping Signatures in the beginning of composer
	 * ------------------------------------------------
	 *
	 * Purists are gonna blast me for this.
	 * But there are so many people (read Outlook users) who want this.
	 * And Evo is an exchange-client, Outlook-replacement etc.
	 * So Here it goes :(
	 *
	 * -- Sankar
	 *
	 */
	if (signature && top_signature) {
		WebKitDOMElement *spacer;

		spacer = prepare_top_signature_spacer (editor_selection, document);
		webkit_dom_node_insert_before (
			WEBKIT_DOM_NODE (body),
			WEBKIT_DOM_NODE (spacer),
			webkit_dom_node_get_next_sibling (WEBKIT_DOM_NODE (signature)),
			NULL);
	}

	if (webkit_dom_node_list_get_length (list) == 0)
		has_paragraphs_in_body = FALSE;

	element = webkit_dom_document_get_element_by_id (document, "-x-evo-input-start");
	if (!signature) {
		if (start_bottom) {
			if (!element) {
				element = prepare_paragraph (editor_selection, document);
				webkit_dom_node_append_child (
					WEBKIT_DOM_NODE (body),
					WEBKIT_DOM_NODE (element),
					NULL);
			}
		} else
			element = WEBKIT_DOM_ELEMENT (body);

		g_object_unref (list);
		goto move_caret;
	}

	if (!has_paragraphs_in_body) {
		element = prepare_paragraph (editor_selection, document);
		if (top_signature) {
			if (start_bottom) {
				webkit_dom_node_append_child (
					WEBKIT_DOM_NODE (body),
					WEBKIT_DOM_NODE (element),
					NULL);
			} else {
				webkit_dom_node_insert_before (
					WEBKIT_DOM_NODE (body),
					WEBKIT_DOM_NODE (element),
					WEBKIT_DOM_NODE (signature),
					NULL);
			}
		} else {
			if (start_bottom)
				webkit_dom_node_insert_before (
					WEBKIT_DOM_NODE (body),
					WEBKIT_DOM_NODE (element),
					WEBKIT_DOM_NODE (signature),
					NULL);
			else
				element = WEBKIT_DOM_ELEMENT (body);
		}
	} else {
		if (!element && top_signature) {
			element = prepare_paragraph (editor_selection, document);
			if (start_bottom) {
					webkit_dom_node_append_child (
					WEBKIT_DOM_NODE (body),
					WEBKIT_DOM_NODE (element),
					NULL);
			} else {
				webkit_dom_node_insert_before (
					WEBKIT_DOM_NODE (body),
					WEBKIT_DOM_NODE (element),
					WEBKIT_DOM_NODE (signature),
					NULL);
			}
		} else if (element && top_signature && !start_bottom) {
			webkit_dom_node_insert_before (
				WEBKIT_DOM_NODE (body),
				WEBKIT_DOM_NODE (element),
				WEBKIT_DOM_NODE (signature),
				NULL);
		} else if (element && start_bottom) {
			/* Leave it how it is */
		} else
			element = WEBKIT_DOM_ELEMENT (body);
	}

	g_object_unref (list);
 move_caret:
	if (element) {
		WebKitDOMDOMSelection *dom_selection;
		WebKitDOMDOMWindow *dom_window;
		WebKitDOMRange *range;

		dom_window = webkit_dom_document_get_default_view (document);
		dom_selection = webkit_dom_dom_window_get_selection (dom_window);
		range = webkit_dom_document_create_range (document);
		webkit_dom_range_select_node_contents (
			range, WEBKIT_DOM_NODE (element), NULL);
		webkit_dom_range_collapse (range, TRUE, NULL);
		webkit_dom_dom_selection_remove_all_ranges (dom_selection);
		webkit_dom_dom_selection_add_range (dom_selection, range);

		g_clear_object (&dom_selection);
		g_clear_object (&dom_window);
		g_clear_object (&range);
	}

	if (start_bottom)
		e_html_editor_selection_scroll_to_caret (editor_selection);

	e_html_editor_view_force_spell_check_in_viewport (view);

	e_html_editor_selection_unblock_selection_changed (editor_selection);
}

static void
composer_load_signature_cb (EMailSignatureComboBox *combo_box,
                            GAsyncResult *result,
                            EMsgComposer *composer)
{
	gchar *contents = NULL;
	gsize length = 0;
	gboolean top_signature, is_html, html_mode, is_message_from_edit_as_new;
	GError *error = NULL;
	gulong list_length, ii;
	EHTMLEditor *editor;
	EHTMLEditorView *view;
	WebKitDOMDocument *document;
	WebKitDOMElement *signature_to_insert;
	WebKitDOMElement *insert_signature_in = NULL;
	WebKitDOMElement *signature_wrapper = NULL;
	WebKitDOMElement *element, *converted_signature = NULL;
	WebKitDOMHTMLElement *body;
	WebKitDOMNodeList *signatures;

	e_mail_signature_combo_box_load_selected_finish (
		combo_box, result, &contents, &length, &is_html, &error);

	/* FIXME Use an EAlert here. */
	if (error != NULL) {
		g_warning ("%s: %s", G_STRFUNC, error->message);
		g_error_free (error);
		goto exit;
	}

	if (composer->priv->ignore_next_signature_change) {
		composer->priv->ignore_next_signature_change = FALSE;
		goto exit;
	}

	editor = e_msg_composer_get_editor (composer);
	view = e_html_editor_get_view (editor);
	is_message_from_edit_as_new =
		e_html_editor_view_is_message_from_edit_as_new (view);

	/* "Edit as New Message" sets is_message_from_edit_as_new.
	 * Always put the signature at the bottom for that case. */
	top_signature =
		use_top_signature (composer) &&
		!is_message_from_edit_as_new &&
		!composer->priv->is_from_new_message;

	/* Create the DOM signature that is the same across all types of signatures. */
	document = webkit_web_view_get_dom_document (WEBKIT_WEB_VIEW (view));
	body = webkit_dom_document_get_body (document);
	signature_to_insert = webkit_dom_document_create_element (document, "span", NULL);
	webkit_dom_element_set_class_name (signature_to_insert, "-x-evo-signature");
	/* The combo box active ID is the signature's ESource UID. */
	webkit_dom_element_set_id (
		signature_to_insert, gtk_combo_box_get_active_id (GTK_COMBO_BOX (combo_box)));
	insert_signature_in = signature_to_insert;

	html_mode = e_html_editor_view_get_html_mode (view);

	/* The signature has no content usually it means it is set to None. */
	if (!contents)
		goto insert;

	if (!is_html) {
		gchar *html;

		html = camel_text_to_html (contents, 0, 0);
		if (html) {
			g_free (contents);

			contents = html;
			length = strlen (contents);
		}

		insert_signature_in = webkit_dom_document_create_element (document, "pre", NULL);
		webkit_dom_node_append_child (
			WEBKIT_DOM_NODE (signature_to_insert),
			WEBKIT_DOM_NODE (insert_signature_in),
			NULL);
	}

	/* If inserting HTML signature in plain text composer we have to convert it. */
	if (is_html && !html_mode && !strstr (contents, "data-evo-signature-plain-text-mode")) {
		gchar *inner_text;

		/* Save the converted signature to avoid parsing it later again
		 * while inserting it into the view. */
		converted_signature = webkit_dom_document_create_element (document, "pre", NULL);
		webkit_dom_html_element_set_inner_html (
			WEBKIT_DOM_HTML_ELEMENT (converted_signature), contents, NULL);
		e_html_editor_view_convert_element_from_html_to_plain_text (view, converted_signature);
		inner_text = webkit_dom_html_element_get_inner_text (WEBKIT_DOM_HTML_ELEMENT (converted_signature));

		g_free (contents);
		contents = inner_text ? g_strstrip (inner_text) : g_strdup ("");
		/* because of the -- \n check */
		is_html = FALSE;
	}

	/* The signature dash convention ("-- \n") is specified
	 * in the "Son of RFC 1036", section 4.3.2.
	 * http://www.chemie.fu-berlin.de/outerspace/netnews/son-of-1036.html
	 */
	if (add_signature_delimiter (composer)) {
		const gchar *delim;
		const gchar *delim_nl;

		if (is_html) {
			delim = "-- <BR>";
			delim_nl = "\n-- <BR>";
		} else {
			delim = "-- \n";
			delim_nl = "\n-- \n";
		}

		/* Skip the delimiter if the signature already has one. */
		if (g_ascii_strncasecmp (contents, delim, strlen (delim)) == 0)
			;  /* skip */
		else if (e_util_strstrcase (contents, delim_nl) != NULL)
			;  /* skip */
		else {
			WebKitDOMElement *pre_delimiter;

			pre_delimiter = webkit_dom_document_create_element (document, "pre", NULL);
			/* Always use the HTML delimiter as we are never in anything
			 * like a strict plain text mode. */
			webkit_dom_html_element_set_inner_html (
				WEBKIT_DOM_HTML_ELEMENT (pre_delimiter), "-- <br>", NULL);
			webkit_dom_node_append_child (
				WEBKIT_DOM_NODE (insert_signature_in),
				WEBKIT_DOM_NODE (pre_delimiter),
				NULL);
		}
	}

	if (converted_signature) {
		WebKitDOMNode *node;

		while ((node = webkit_dom_node_get_first_child (WEBKIT_DOM_NODE (converted_signature))))
			webkit_dom_node_append_child (
				WEBKIT_DOM_NODE (insert_signature_in), node, NULL);
		remove_node (WEBKIT_DOM_NODE (converted_signature));
	} else
		webkit_dom_html_element_insert_adjacent_html (
			WEBKIT_DOM_HTML_ELEMENT (insert_signature_in), "beforeend", contents, NULL);

	element = webkit_dom_element_query_selector (
		insert_signature_in, "[data-evo-signature-plain-text-mode]", NULL);
	if (element)
		webkit_dom_element_remove_attribute (
			element, "data-evo-signature-plain-text-mode");
	g_free (contents);

insert:
	/* Remove the old signature and insert the new one. */
	signatures = webkit_dom_document_get_elements_by_class_name (
		document, "-x-evo-signature-wrapper");
	list_length = webkit_dom_node_list_get_length (signatures);
	for (ii = 0; ii < list_length; ii++) {
		WebKitDOMNode *wrapper, *signature;

		wrapper = webkit_dom_node_list_item (signatures, ii);
		signature = webkit_dom_node_get_first_child (wrapper);

		/* Old messages will have the signature id in the name attribute, correct it. */
		dom_element_rename_attribute (WEBKIT_DOM_ELEMENT (signature), "name", "id");

		/* When we are editing a message with signature, we need to unset the
		 * active signature id as if the signature in the message was edited
		 * by the user we would discard these changes. */
		if (composer->priv->set_signature_from_message && contents &&
		    (is_message_from_edit_as_new || e_html_editor_view_is_message_from_draft (view))) {
			if (composer->priv->check_if_signature_is_changed) {
				/* Normalize the signature that we want to insert as the one in the
				 * message already is normalized. */
				webkit_dom_node_normalize (WEBKIT_DOM_NODE (signature_to_insert));
				if (!webkit_dom_node_is_equal_node (WEBKIT_DOM_NODE (signature_to_insert), signature)) {
					/* Signature in the body is different than the one with the
					 * same id, so set the active signature to None and leave
					 * the signature that is in the body. */
					gtk_combo_box_set_active_id (GTK_COMBO_BOX (combo_box), "none");
					composer->priv->ignore_next_signature_change = TRUE;
				}

				composer->priv->check_if_signature_is_changed = FALSE;
				composer->priv->set_signature_from_message = FALSE;
			} else {
				gchar *id;

				/* Load the signature and check if is it the same
				 * as the signature in body or the user previously
				 * changed it. */
				id = webkit_dom_element_get_id (WEBKIT_DOM_ELEMENT (signature));
				gtk_combo_box_set_active_id (GTK_COMBO_BOX (combo_box), id);
				g_free (id);

				composer->priv->check_if_signature_is_changed = TRUE;
			}
			g_object_unref (wrapper);
			g_object_unref (signatures);
			g_object_unref (composer);

			return;
		}

		/* If the top signature was set we have to remove the newline
		 * that was inserted after it */
		if (top_signature) {
			WebKitDOMElement *spacer;

			spacer = webkit_dom_document_query_selector (
				document, ".-x-evo-top-signature-spacer", NULL);
			if (spacer)
				remove_node_if_empty (WEBKIT_DOM_NODE (spacer));
		}
		/* Leave just one signature wrapper there as it will be reused. */
		if (ii != list_length - 1) {
			g_object_unref (wrapper);
			remove_node (wrapper);
		} else {
			remove_node (signature);
			signature_wrapper = WEBKIT_DOM_ELEMENT (wrapper);
		}
	}

	if (signature_wrapper) {
		webkit_dom_node_append_child (
			WEBKIT_DOM_NODE (signature_wrapper),
			WEBKIT_DOM_NODE (signature_to_insert),
			NULL);

		/* Insert a spacer below the top signature */
		if (top_signature && contents) {
			WebKitDOMElement *spacer;
			EHTMLEditorSelection *editor_selection;

			editor_selection = e_html_editor_view_get_selection (view);
			spacer = prepare_top_signature_spacer (editor_selection, document);
			webkit_dom_node_insert_before (
				WEBKIT_DOM_NODE (body),
				WEBKIT_DOM_NODE (spacer),
				webkit_dom_node_get_next_sibling (WEBKIT_DOM_NODE (signature_wrapper)),
				NULL);
		}

		g_object_unref (signature_wrapper);
	} else {
		signature_wrapper = webkit_dom_document_create_element (document, "div", NULL);
		webkit_dom_element_set_class_name (signature_wrapper, "-x-evo-signature-wrapper");

		webkit_dom_node_append_child (
			WEBKIT_DOM_NODE (signature_wrapper),
			WEBKIT_DOM_NODE (signature_to_insert),
			NULL);

		if (top_signature) {
			GSettings *settings;
			WebKitDOMNode *child;

			child = webkit_dom_node_get_first_child (WEBKIT_DOM_NODE (body));

			settings = e_util_ref_settings ("org.gnome.evolution.mail");
			if (g_settings_get_boolean (settings, "composer-reply-start-bottom")) {
				webkit_dom_node_insert_before (
					WEBKIT_DOM_NODE (body),
					WEBKIT_DOM_NODE (signature_wrapper),
					child,
					NULL);
			} else {
				/* When we are using signature on top the caret
				 * should be before the signature */
				webkit_dom_node_insert_before (
					WEBKIT_DOM_NODE (body),
					WEBKIT_DOM_NODE (signature_wrapper),
					child,
					NULL);
			}
			g_object_unref (settings);
		} else {
			webkit_dom_node_append_child (
				WEBKIT_DOM_NODE (body),
				WEBKIT_DOM_NODE (signature_wrapper),
				NULL);
		}
		composer_move_caret (composer);
	}
	g_object_unref (signatures);

	if (is_html && html_mode)
		e_html_editor_view_fix_file_uri_images (view);

 exit:
	/* Make sure the flag will be unset and won't influence user's choice */
	composer->priv->set_signature_from_message = FALSE;

	g_object_unref (composer);
}

static void
composer_web_view_load_status_changed_cb (WebKitWebView *webkit_web_view,
					  GParamSpec *pspec,
					  EMsgComposer *composer)
{
	WebKitLoadStatus status;

	g_return_if_fail (E_IS_MSG_COMPOSER (composer));

	status = webkit_web_view_get_load_status (webkit_web_view);

	if (status != WEBKIT_LOAD_FINISHED)
		return;

	g_signal_handlers_disconnect_by_func (
		webkit_web_view,
		G_CALLBACK (composer_web_view_load_status_changed_cb),
		NULL);

	e_composer_update_signature (composer);
}

void
e_composer_update_signature (EMsgComposer *composer)
{
	EComposerHeaderTable *table;
	EMailSignatureComboBox *combo_box;
	EHTMLEditor *editor;
	EHTMLEditorView *view;
	WebKitLoadStatus status;

	g_return_if_fail (E_IS_MSG_COMPOSER (composer));

	/* Do nothing if we're redirecting a message or we disabled
	 * the signature on purpose */
	if (composer->priv->redirect || composer->priv->disable_signature)
		return;

	table = e_msg_composer_get_header_table (composer);
	combo_box = e_composer_header_table_get_signature_combo_box (table);
	editor = e_msg_composer_get_editor (composer);
	view = e_html_editor_get_view (editor);

	status = webkit_web_view_get_load_status (WEBKIT_WEB_VIEW (view));
	/* If document is not loaded, we will wait for him */
	if (status != WEBKIT_LOAD_FINISHED) {
		/* Disconnect previous handlers */
		g_signal_handlers_disconnect_by_func (
			WEBKIT_WEB_VIEW (view),
			G_CALLBACK (composer_web_view_load_status_changed_cb),
			composer);
		g_signal_connect (
			WEBKIT_WEB_VIEW(view), "notify::load-status",
			G_CALLBACK (composer_web_view_load_status_changed_cb),
			composer);
		return;
	}

	/* XXX Signature files should be local and therefore load quickly,
	 *     so while we do load them asynchronously we don't allow for
	 *     user cancellation and we keep the composer alive until the
	 *     asynchronous loading is complete. */
	e_mail_signature_combo_box_load_selected (
		combo_box, G_PRIORITY_DEFAULT, NULL,
		(GAsyncReadyCallback) composer_load_signature_cb,
		g_object_ref (composer));
}

