/*
 *
 * 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/>
 *
 *
 * Authors:
 *		Michael Zucchi <notzed@novell.com>
 *		Rodrigo Moya <rodrigo@novell.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

/* Convert a mail message into a task */

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

#include <glib/gi18n-lib.h>
#include <string.h>
#include <stdio.h>

#include <gtkhtml/gtkhtml.h>
#include <gconf/gconf-client.h>
#include <libecal/e-cal-client.h>
#include <libecal/e-cal-component.h>
#include <libedataserver/e-account.h>
#include <libedataserver/e-flag.h>
#include <libedataserverui/e-source-selector-dialog.h>
#include <libedataserverui/e-client-utils.h>

#include <mail/e-mail-browser.h>
#include <mail/em-utils.h>
#include <mail/em-format-html.h>
#include <mail/message-list.h>
#include <e-util/e-account-utils.h>
#include <e-util/e-dialog-utils.h>
#include <misc/e-popup-action.h>
#include <shell/e-shell-view.h>
#include <shell/e-shell-window-actions.h>
#include <calendar/gui/dialogs/comp-editor.h>
#include <calendar/gui/dialogs/event-editor.h>
#include <calendar/gui/dialogs/task-editor.h>
#include <calendar/gui/dialogs/memo-editor.h>
#include <misc/e-attachment-store.h>

#define E_SHELL_WINDOW_ACTION_CONVERT_TO_EVENT(window) \
	E_SHELL_WINDOW_ACTION ((window), "mail-convert-to-event")
#define E_SHELL_WINDOW_ACTION_CONVERT_TO_MEETING(window) \
	E_SHELL_WINDOW_ACTION ((window), "mail-convert-to-meeting")
#define E_SHELL_WINDOW_ACTION_CONVERT_TO_MEMO(window) \
	E_SHELL_WINDOW_ACTION ((window), "mail-convert-to-memo")
#define E_SHELL_WINDOW_ACTION_CONVERT_TO_TASK(window) \
	E_SHELL_WINDOW_ACTION ((window), "mail-convert-to-task")

gboolean	mail_browser_init		(GtkUIManager *ui_manager,
						 EMailBrowser *browser);
gboolean	mail_shell_view_init		(GtkUIManager *ui_manager,
						 EShellView *shell_view);

static CompEditor*
get_component_editor (EShell *shell,
                      ECalClient *client,
                      ECalComponent *comp,
                      gboolean is_new,
                      GError **error)
{
	ECalComponentId *id;
	CompEditorFlags flags = 0;
	CompEditor *editor = NULL;

	g_return_val_if_fail (E_IS_SHELL (shell), NULL);
	g_return_val_if_fail (E_IS_CAL_CLIENT (client), NULL);
	g_return_val_if_fail (E_IS_CAL_COMPONENT (comp), NULL);

	id = e_cal_component_get_id (comp);
	g_return_val_if_fail (id != NULL, NULL);
	g_return_val_if_fail (id->uid != NULL, NULL);

	if (is_new) {
		flags |= COMP_EDITOR_NEW_ITEM;
	} else {
		editor = comp_editor_find_instance (id->uid);
	}

	if (!editor) {
		if (itip_organizer_is_user (comp, client))
			flags |= COMP_EDITOR_USER_ORG;

		switch (e_cal_component_get_vtype (comp)) {
		case E_CAL_COMPONENT_EVENT:
			if (e_cal_component_has_attendees (comp))
				flags |= COMP_EDITOR_MEETING;

			editor = event_editor_new (client, shell, flags);

			if (flags & COMP_EDITOR_MEETING)
				event_editor_show_meeting (EVENT_EDITOR (editor));
			break;
		case E_CAL_COMPONENT_TODO:
			if (e_cal_component_has_attendees (comp))
				flags |= COMP_EDITOR_IS_ASSIGNED;

			editor = task_editor_new (client, shell, flags);

			if (flags & COMP_EDITOR_IS_ASSIGNED)
				task_editor_show_assignment (TASK_EDITOR (editor));
			break;
		case E_CAL_COMPONENT_JOURNAL:
			if (e_cal_component_has_organizer (comp))
				flags |= COMP_EDITOR_IS_SHARED;

			editor = memo_editor_new (client, shell, flags);
			break;
		default:
			if (error)
				*error = e_client_error_create (E_CLIENT_ERROR_INVALID_ARG, NULL);
			break;
		}

		if (editor) {
			comp_editor_edit_comp (editor, comp);

			/* request save for new events */
			comp_editor_set_changed (editor, is_new);
		}
	}

	e_cal_component_free_id (id);

	return editor;
}

static void
set_attendees (ECalComponent *comp, CamelMimeMessage *message, const gchar *organizer)
{
	GSList *attendees = NULL, *to_free = NULL;
	ECalComponentAttendee *ca;
	CamelInternetAddress *from = NULL, *to, *cc, *bcc, *arr[4];
	gint len, i, j;

	if (message->reply_to)
		from = message->reply_to;
	else if (message->from)
		from = message->from;

	to = camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_TO);
	cc = camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_CC);
	bcc = camel_mime_message_get_recipients (message, CAMEL_RECIPIENT_TYPE_BCC);

	arr[0] = from; arr[1] = to; arr[2] = cc; arr[3] = bcc;

	for (j = 0; j < 4; j++) {
		if (!arr[j])
			continue;

		len = CAMEL_ADDRESS (arr[j])->addresses->len;
		for (i = 0; i < len; i++) {
			const gchar *name, *addr;

			if (camel_internet_address_get (arr[j], i, &name, &addr)) {
				gchar *temp;

				temp = g_strconcat ("mailto:", addr, NULL);
				if (organizer && g_ascii_strcasecmp (temp, organizer) == 0) {
					/* do not add organizer twice */
					g_free (temp);
					continue;
				}

				ca = g_new0 (ECalComponentAttendee, 1);

				ca->value = temp;
				ca->cn = name;
				ca->cutype = ICAL_CUTYPE_INDIVIDUAL;
				ca->status = ICAL_PARTSTAT_NEEDSACTION;
				if (j == 0) {
					/* From */
					ca->role = ICAL_ROLE_CHAIR;
				} else if (j == 2) {
					/* BCC  */
					ca->role = ICAL_ROLE_OPTPARTICIPANT;
				} else {
					/* all other */
					ca->role = ICAL_ROLE_REQPARTICIPANT;
				}

				to_free = g_slist_prepend (to_free, temp);

				attendees = g_slist_append (attendees, ca);
			}
		}
	}

	e_cal_component_set_attendee_list (comp, attendees);

	g_slist_foreach (attendees, (GFunc) g_free, NULL);
	g_slist_foreach (to_free, (GFunc) g_free, NULL);

	g_slist_free (to_free);
	g_slist_free (attendees);
}

static const gchar *
prepend_from (CamelMimeMessage *message, gchar **text)
{
	gchar *res, *tmp, *addr = NULL;
	const gchar *name = NULL, *eml = NULL;
	CamelInternetAddress *from = NULL;

	g_return_val_if_fail (message != NULL, NULL);
	g_return_val_if_fail (text != NULL, NULL);

	if (message->reply_to)
		from = message->reply_to;
	else if (message->from)
		from = message->from;

	if (from && camel_internet_address_get (from, 0, &name, &eml))
		addr = camel_internet_address_format_address (name, eml);

	/* To Translators: The full sentence looks like: "Created from a mail by John Doe <john.doe@myco.example>" */
	tmp = g_strdup_printf (_("Created from a mail by %s"), addr ? addr : "");

	res = g_strconcat (tmp, "\n", *text, NULL);

	g_free (tmp);
	g_free (*text);

	*text = res;

	return res;
}

static void
set_description (ECalComponent *comp, CamelMimeMessage *message)
{
	CamelDataWrapper *content;
	CamelStream *stream;
	CamelContentType *type;
	CamelMimePart *mime_part = CAMEL_MIME_PART (message);
	ECalComponentText *text = NULL;
	GByteArray *byte_array;
	GSList *sl = NULL;
	gchar *str, *convert_str = NULL;
	gsize bytes_read, bytes_written;
	gint count = 2;

	content = camel_medium_get_content ((CamelMedium *) message);
	if (!content)
		return;

	/*
	 * Get non-multipart content from multipart message.
	 */
	while (CAMEL_IS_MULTIPART (content) && count > 0) {
		mime_part = camel_multipart_get_part (CAMEL_MULTIPART (content), 0);
		content = camel_medium_get_content (CAMEL_MEDIUM (mime_part));
		count--;
	}

	if (!mime_part)
		return;

	type = camel_mime_part_get_content_type (mime_part);
	if (!camel_content_type_is (type, "text", "plain"))
		return;

	byte_array = g_byte_array_new ();
	stream = camel_stream_mem_new_with_byte_array (byte_array);
	camel_data_wrapper_decode_to_stream_sync (content, stream, NULL, NULL);
	str = g_strndup ((gchar *) byte_array->data, byte_array->len);
	g_object_unref (stream);

	/* convert to UTF-8 string */
	if (str && content->mime_type->params && content->mime_type->params->value) {
		convert_str = g_convert (str, strlen (str),
					 "UTF-8", content->mime_type->params->value,
					 &bytes_read, &bytes_written, NULL);
	}

	text = g_new0 (ECalComponentText, 1);
	if (convert_str)
		text->value = prepend_from (message, &convert_str);
	else
		text->value = prepend_from (message, &str);
	text->altrep = NULL;
	sl = g_slist_append (sl, text);

	e_cal_component_set_description_list (comp, sl);

	g_free (str);
	if (convert_str)
		g_free (convert_str);
	e_cal_component_free_text_list (sl);
}

static gchar *
set_organizer (ECalComponent *comp, CamelFolder *folder)
{
	EAccount *account = NULL;
	const gchar *str, *name;
	ECalComponentOrganizer organizer = {NULL, NULL, NULL, NULL};
	gchar *res;

	if (folder) {
		CamelStore *store = camel_folder_get_parent_store (folder);

		account = e_get_account_by_uid (camel_service_get_uid (CAMEL_SERVICE (store)));
	}

	if (!account)
		account = e_get_default_account ();
	if (!account)
		return NULL;

	str = e_account_get_string (account, E_ACCOUNT_ID_ADDRESS);
	name = e_account_get_string (account, E_ACCOUNT_ID_NAME);

	if (!str)
		return NULL;

	res = g_strconcat ("mailto:", str, NULL);
	organizer.value = res;
	organizer.cn = name;
	e_cal_component_set_organizer (comp, &organizer);

	return res;
}

struct _att_async_cb_data {
	gchar **uris;
	EFlag *flag;
};

static void
attachment_load_finished (EAttachmentStore *store,
                          GAsyncResult *result,
                          gpointer user_data)
{
	struct _att_async_cb_data *data = user_data;

	/* XXX Should be no need to check for error here.
	 *     This is just to reset state in the EAttachment. */
	e_attachment_store_load_finish (store, result, NULL);

	e_flag_set (data->flag);
}

static void
attachment_save_finished (EAttachmentStore *store,
                          GAsyncResult *result,
                          gpointer user_data)
{
	struct _att_async_cb_data *data = user_data;
	gchar **uris;
	GError *error = NULL;

	uris = e_attachment_store_save_finish (store, result, &error);
	if (error)
		data->uris = NULL;
	else
		data->uris = uris;

	g_clear_error (&error);

	e_flag_set (data->flag);
}

static void
set_attachments (ECalClient *client, ECalComponent *comp, CamelMimeMessage *message)
{
	/* XXX Much of this is copied from CompEditor::get_attachment_list().
	 *     Perhaps it should be split off as a separate utility? */

	EAttachmentStore *store;
	CamelDataWrapper *content;
	CamelMultipart *multipart;
	GFile *destination;
	GList *attachment_list = NULL;
	GSList *uri_list = NULL;
	const gchar *comp_uid = NULL;
	const gchar *local_store;
	gint ii, n_parts;
	gchar *path;
	struct _att_async_cb_data cb_data;

	cb_data.flag = e_flag_new ();
	cb_data.uris = NULL;

	content = camel_medium_get_content ((CamelMedium *) message);
	if (!content || !CAMEL_IS_MULTIPART (content))
		return;

	n_parts = camel_multipart_get_number (CAMEL_MULTIPART (content));
	if (n_parts < 1)
		return;

	e_cal_component_get_uid (comp, &comp_uid);
	local_store = e_cal_client_get_local_attachment_store (client);
	path = g_build_path ("/", local_store, comp_uid, NULL);

	destination = g_file_new_for_path (path);
	g_free (path);

	/* Create EAttachments from the MIME parts and add them to the
	 * attachment store. */

	multipart = CAMEL_MULTIPART (content);
	store = E_ATTACHMENT_STORE (e_attachment_store_new ());

	for (ii = 1; ii < n_parts; ii++) {
		EAttachment *attachment;
		CamelMimePart *mime_part;

		attachment = e_attachment_new ();
		mime_part = camel_multipart_get_part (multipart, ii);
		e_attachment_set_mime_part (attachment, mime_part);

		attachment_list = g_list_append (attachment_list, attachment);
	}

	e_flag_clear (cb_data.flag);

	e_attachment_store_load_async (
		store, attachment_list, (GAsyncReadyCallback)
		attachment_load_finished, &cb_data);

	/* Loading should be instantaneous since we already have
	 * the full content, but we need to wait for the callback.
	 */
	e_flag_wait (cb_data.flag);

	g_list_foreach (attachment_list, (GFunc) g_object_unref, NULL);
	g_list_free (attachment_list);

	cb_data.uris = NULL;
	e_flag_clear (cb_data.flag);

	e_attachment_store_save_async (
		store, destination, (GAsyncReadyCallback)
		attachment_save_finished, &cb_data);

	/* We can't return until we have results. */
	e_flag_wait (cb_data.flag);

	if (cb_data.uris == NULL) {
		e_flag_free (cb_data.flag);
		g_warning ("No attachment URIs retrieved.");
		return;
	}

	/* Transfer the URI strings to the GSList. */
	for (ii = 0; cb_data.uris[ii] != NULL; ii++) {
		uri_list = g_slist_prepend (uri_list, cb_data.uris[ii]);
		cb_data.uris[ii] = NULL;
	}

	e_flag_free (cb_data.flag);
	g_free (cb_data.uris);

	/* XXX Does this take ownership of the list? */
	e_cal_component_set_attachment_list (comp, uri_list);

	e_attachment_store_remove_all (store);
	g_object_unref (destination);
	g_object_unref (store);
}

static void
set_priority (ECalComponent *comp, CamelMimePart *part)
{
	const gchar *prio;

	g_return_if_fail (comp != NULL);
	g_return_if_fail (part != NULL);

	prio = camel_header_raw_find (& (part->headers), "X-Priority", NULL);
	if (prio && atoi (prio) > 0) {
		gint priority = 1;

		e_cal_component_set_priority (comp, &priority);
	}
}

struct _report_error
{
	gchar *format;
	gchar *param;
};

static gboolean
do_report_error (struct _report_error *err)
{
	if (err) {
		e_notice (NULL, GTK_MESSAGE_ERROR, err->format, err->param);
		g_free (err->format);
		g_free (err->param);
		g_free (err);
	}

	return FALSE;
}

static void
report_error_idle (const gchar *format, const gchar *param)
{
	struct _report_error *err = g_new (struct _report_error, 1);

	err->format = g_strdup (format);
	err->param = g_strdup (param);

	g_usleep (250);
	g_idle_add ((GSourceFunc) do_report_error, err);
}

struct _manage_comp
{
	ECalClient *client;
	ECalComponent *comp;
	icalcomponent *stored_comp; /* the one in client already */
	GCond *cond;
	GMutex *mutex;
	gint mails_count;
	gint mails_done;
	gchar *editor_title;
	gboolean can_continue;
};

static void
free_manage_comp_struct (struct _manage_comp *mc)
{
	g_return_if_fail (mc != NULL);

	g_object_unref (mc->comp);
	g_object_unref (mc->client);
	if (mc->stored_comp)
		icalcomponent_free (mc->stored_comp);
	if (mc->mutex)
		g_mutex_free (mc->mutex);
	if (mc->cond)
		g_cond_free (mc->cond);
	if (mc->editor_title)
		g_free (mc->editor_title);

	g_free (mc);
}

static gint
do_ask (const gchar *text, gboolean is_create_edit_add)
{
	gint res;
	GtkWidget *dialog = gtk_message_dialog_new (NULL,
		GTK_DIALOG_MODAL,
		GTK_MESSAGE_QUESTION,
		is_create_edit_add ? GTK_BUTTONS_NONE : GTK_BUTTONS_YES_NO,
		"%s", text);

	if (is_create_edit_add) {
		gtk_dialog_add_buttons (GTK_DIALOG (dialog),
			GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
			GTK_STOCK_EDIT, GTK_RESPONSE_YES,
			GTK_STOCK_NEW, GTK_RESPONSE_NO,
			NULL);
	}

	res = gtk_dialog_run (GTK_DIALOG (dialog));

	gtk_widget_destroy (dialog);

	return res;
}

static const gchar *
get_question_edit_old (ECalClientSourceType source_type)
{
	const gchar *ask = NULL;

	switch (source_type) {
	case E_CAL_CLIENT_SOURCE_TYPE_EVENTS:
		ask = _("Selected calendar contains event '%s' already. Would you like to edit the old event?");
		break;
	case E_CAL_CLIENT_SOURCE_TYPE_TASKS:
		ask = _("Selected task list contains task '%s' already. Would you like to edit the old task?");
		break;
	case E_CAL_CLIENT_SOURCE_TYPE_MEMOS:
		ask = _("Selected memo list contains memo '%s' already. Would you like to edit the old memo?");
		break;
	default:
		g_assert_not_reached ();
		break;
	}

	return ask;
}

static const gchar *
get_question_add_all_mails (ECalClientSourceType source_type)
{
	const gchar *ask = NULL;

	switch (source_type) {
	case E_CAL_CLIENT_SOURCE_TYPE_EVENTS:
		ask = _("You have selected %d mails to be converted to events. Do you really want to add them all?");
		break;
	case E_CAL_CLIENT_SOURCE_TYPE_TASKS:
		ask = _("You have selected %d mails to be converted to tasks. Do you really want to add them all?");
		break;
	case E_CAL_CLIENT_SOURCE_TYPE_MEMOS:
		ask = _("You have selected %d mails to be converted to memos. Do you really want to add them all?");
		break;
	default:
		g_assert_not_reached ();
		break;
	}

	return ask;
}

static void
comp_editor_closed (CompEditor *editor,
		    gboolean accepted,
		    struct _manage_comp *mc)
{
	if (!mc)
		return;

	if (!accepted && mc->mails_done < mc->mails_count)
		mc->can_continue = (do_ask (_("Do you wish to continue converting remaining mails?"), FALSE) == GTK_RESPONSE_YES);

	/* Signal the do_mail_to_event thread that editor was closed and editor
	   for next event can be displayed (if any) */
	g_cond_signal (mc->cond);
}

/*
 * This handler takes title of the editor window and
 * inserts information about number of processed mails and
 * number of all mails to process, so the window title
 * will look like "Appointment (3/10) - An appoitment name"
 */
static void
comp_editor_title_changed (GtkWidget *widget,
			   GParamSpec *pspec,
			   struct _manage_comp *mc)
{
	GtkWindow *editor = GTK_WINDOW (widget);
	const gchar *title = gtk_window_get_title (editor);
	gchar *new_title;
	gchar *splitter;
	gchar *comp_name, *task_name;

	if (!mc)
		return;

	/* Recursion prevence */
	if (mc->editor_title && g_utf8_collate (mc->editor_title, title) == 0)
		return;

	splitter = strchr (title, '-');
	if (!splitter)
		return;

	comp_name = g_strndup (title, splitter - title - 1);
	task_name = g_strdup (splitter + 2);
	new_title = g_strdup_printf ("%s (%d/%d) - %s",
			comp_name, mc->mails_done, mc->mails_count, task_name);

	/* Remember the new title, so that when gtk_window_set_title() causes
	   this handler to be recursively called, we can recognize that and
	   prevent endless recursion */
	if (mc->editor_title)
		g_free (mc->editor_title);
	mc->editor_title = new_title;

	gtk_window_set_title (editor, new_title);

	g_free (comp_name);
	g_free (task_name);
}

static gboolean
do_manage_comp_idle (struct _manage_comp *mc)
{
	GError *error = NULL;
	ECalClientSourceType source_type = E_CAL_CLIENT_SOURCE_TYPE_LAST;
	ECalComponent *edit_comp = NULL;

	g_return_val_if_fail (mc, FALSE);

	source_type = e_cal_client_get_source_type (mc->client);

	if (source_type == E_CAL_CLIENT_SOURCE_TYPE_LAST) {
		free_manage_comp_struct (mc);

		g_warning ("mail-to-task: Incorrect call of %s, no data given", G_STRFUNC);
		return FALSE;
	}

	if (mc->stored_comp) {
		const gchar *ask = get_question_edit_old (source_type);

		if (ask) {
			gchar *msg = g_strdup_printf (ask, icalcomponent_get_summary (mc->stored_comp) ? icalcomponent_get_summary (mc->stored_comp) : _("[No Summary]"));
			gint chosen;

			chosen = do_ask (msg, TRUE);

			if (chosen == GTK_RESPONSE_YES) {
				edit_comp = e_cal_component_new ();
				if (!e_cal_component_set_icalcomponent (edit_comp, icalcomponent_new_clone (mc->stored_comp))) {
					g_object_unref (edit_comp);
					edit_comp = NULL;
					error = g_error_new (E_CAL_CLIENT_ERROR,
						E_CAL_CLIENT_ERROR_INVALID_OBJECT,
						"%s", _("Invalid object returned from a server"));

				}
			} else if (chosen == GTK_RESPONSE_NO) {
				/* user wants to create a new event, thus generate a new UID */
				gchar *new_uid = e_cal_component_gen_uid ();
				edit_comp = mc->comp;
				e_cal_component_set_uid (edit_comp, new_uid);
				e_cal_component_set_recurid (edit_comp, NULL);
				g_free (new_uid);
			}
			g_free (msg);
		}
	} else {
		edit_comp = mc->comp;
	}

	if (edit_comp) {
		EShell *shell;
		CompEditor *editor;

		/* FIXME Pass in the EShell instance. */
		shell = e_shell_get_default ();
		editor = get_component_editor (shell, mc->client, edit_comp,
				edit_comp == mc->comp, &error);

		if (editor && !error) {
			/* Force editor's title change */
			comp_editor_title_changed (GTK_WIDGET (editor), NULL, mc);

			g_signal_connect (editor, "notify::title",
					G_CALLBACK (comp_editor_title_changed), mc);
			g_signal_connect (editor, "comp_closed",
					G_CALLBACK (comp_editor_closed), mc);

			gtk_window_present (GTK_WINDOW (editor));

			if (edit_comp != mc->comp)
				g_object_unref (edit_comp);
		} else {
			g_warning ("Failed to create event editor: %s", error ? error->message : "Unknown error");
			g_cond_signal (mc->cond);
		}
	} else {
		/* User canceled editing already existing event, so treat it as if he just closed the editor window */
		comp_editor_closed (NULL, FALSE, mc);
		g_cond_signal (mc->cond);
	}

	if (error) {
		e_notice (NULL, GTK_MESSAGE_ERROR, _("An error occurred during processing: %s"), error->message);
		g_clear_error (&error);
	}

	return FALSE;
}

typedef struct {
	ECalClient *client;
	CamelFolder *folder;
	GPtrArray *uids;
	gchar *selected_text;
	gboolean with_attendees;
}AsyncData;

static gboolean
do_mail_to_event (AsyncData *data)
{
	ECalClient *client = data->client;
	CamelFolder *folder = data->folder;
	GPtrArray *uids = data->uids;
	GError *err = NULL;

	/* open the task client */
	if (!e_client_open_sync (E_CLIENT (client), FALSE, NULL, &err)) {
		report_error_idle (_("Cannot open calendar. %s"), err ? err->message : _("Unknown error."));
	} else if (e_client_is_readonly (E_CLIENT (client))) {
		if (err)
			report_error_idle ("Check readonly failed. %s", err->message);
		else {
			switch (e_cal_client_get_source_type (client)) {
			case E_CAL_CLIENT_SOURCE_TYPE_EVENTS:
				report_error_idle (_("Selected source is read only, thus cannot create event there. Select other source, please."), NULL);
				break;
			case E_CAL_CLIENT_SOURCE_TYPE_TASKS:
				report_error_idle (_("Selected source is read only, thus cannot create task there. Select other source, please."), NULL);
				break;
			case E_CAL_CLIENT_SOURCE_TYPE_MEMOS:
				report_error_idle (_("Selected source is read only, thus cannot create memo there. Select other source, please."), NULL);
				break;
			default:
				g_assert_not_reached ();
				break;
			}
		}
	} else {
		gint i;
		ECalClientSourceType source_type = e_cal_client_get_source_type (client);
		ECalComponentDateTime dt, dt2;
		struct icaltimetype tt, tt2;
		struct _manage_comp *oldmc = NULL;

		/* set start day of the event as today, without time - easier than looking for a calendar's time zone */
		tt = icaltime_today ();
		dt.value = &tt;
		dt.tzid = NULL;

		tt2 = tt;
		icaltime_adjust (&tt2, 1, 0, 0, 0);
		dt2.value = &tt2;
		dt2.tzid = NULL;

		for (i = 0; i < (uids ? uids->len : 0); i++) {
			CamelMimeMessage *message;
			ECalComponent *comp;
			ECalComponentText text;
			icalproperty *icalprop;
			icalcomponent *icalcomp;
			struct _manage_comp *mc;

			/* retrieve the message from the CamelFolder */
			/* FIXME Not passing a GCancellable or GError. */
			message = camel_folder_get_message_sync (
				folder, g_ptr_array_index (uids, i),
				NULL, NULL);
			if (!message) {
				continue;
			}

			comp = e_cal_component_new ();

			switch (source_type) {
			case E_CAL_CLIENT_SOURCE_TYPE_EVENTS:
				e_cal_component_set_new_vtype (comp, E_CAL_COMPONENT_EVENT);
				break;
			case E_CAL_CLIENT_SOURCE_TYPE_TASKS:
				e_cal_component_set_new_vtype (comp, E_CAL_COMPONENT_TODO);
				break;
			case E_CAL_CLIENT_SOURCE_TYPE_MEMOS:
				e_cal_component_set_new_vtype (comp, E_CAL_COMPONENT_JOURNAL);
				break;
			default:
				g_assert_not_reached ();
				break;
			}

			e_cal_component_set_uid (comp, camel_mime_message_get_message_id (message));
			e_cal_component_set_dtstart (comp, &dt);

			if (source_type == E_CAL_CLIENT_SOURCE_TYPE_EVENTS) {
				/* make it an all-day event */
				e_cal_component_set_dtend (comp, &dt2);
			}

			/* set the summary */
			text.value = camel_mime_message_get_subject (message);
			text.altrep = NULL;
			e_cal_component_set_summary (comp, &text);

			/* set all fields */
			if (data->selected_text) {
				GSList sl;

				text.value = data->selected_text;
				text.altrep = NULL;
				sl.next = NULL;
				sl.data = &text;

				e_cal_component_set_description_list (comp, &sl);
			} else
				set_description (comp, message);

			if (data->with_attendees) {
				gchar *organizer;

				/* set actual user as organizer, to be able to change event's properties */
				organizer = set_organizer (comp, data->folder);
				set_attendees (comp, message, organizer);
				g_free (organizer);
			}

			/* set attachment files */
			set_attachments (client, comp, message);

			/* priority */
			set_priority (comp, CAMEL_MIME_PART (message));

			/* no need to increment a sequence number, this is a new component */
			e_cal_component_abort_sequence (comp);

			icalcomp = e_cal_component_get_icalcomponent (comp);

			icalprop = icalproperty_new_x ("1");
			icalproperty_set_x_name (icalprop, "X-EVOLUTION-MOVE-CALENDAR");
			icalcomponent_add_property (icalcomp, icalprop);

			mc = g_new0 (struct _manage_comp, 1);
			mc->client = g_object_ref (client);
			mc->comp = g_object_ref (comp);
			mc->mutex = g_mutex_new ();
			mc->cond = g_cond_new ();
			mc->mails_count = uids->len;
			mc->mails_done = i + 1; /* Current task */
			mc->editor_title = NULL;
			mc->can_continue = TRUE;

			if (oldmc) {
				/* Wait for user to quit the editor created in previous iteration
				 * before displaying next one */
				gboolean can_continue;
				g_mutex_lock (oldmc->mutex);
				g_cond_wait (oldmc->cond, oldmc->mutex);
				g_mutex_unlock (oldmc->mutex);
				can_continue = oldmc->can_continue;
				free_manage_comp_struct (oldmc);
				oldmc = NULL;

				if (!can_continue)
					break;
			}

			if (!e_cal_client_get_object_sync (client, icalcomponent_get_uid (icalcomp), NULL, &(mc->stored_comp), NULL, NULL))
				mc->stored_comp = NULL;

			g_idle_add ((GSourceFunc) do_manage_comp_idle, mc);

			oldmc = mc;

			g_object_unref (comp);
			g_object_unref (message);

		}

		/* Wait for the last editor and then clean up */
		if (oldmc) {
			g_mutex_lock (oldmc->mutex);
			g_cond_wait (oldmc->cond, oldmc->mutex);
			g_mutex_unlock (oldmc->mutex);
			free_manage_comp_struct (oldmc);
		}
	}

	/* free memory */
	g_object_unref (data->client);
	camel_folder_free_uids (folder, uids);
	g_object_unref (folder);
	g_free (data->selected_text);
	g_free (data);
	data = NULL;

	if (err)
		g_error_free (err);

	return TRUE;
}

static gboolean
text_contains_nonwhitespace (const gchar *text, gint len)
{
	const gchar *p;
	gunichar c = 0;

	if (!text || len<=0)
		return FALSE;

	p = text;

	while (p && p - text < len) {
		c = g_utf8_get_char (p);
		if (!c)
			break;

		if (!g_unichar_isspace (c))
			break;

		p = g_utf8_next_char (p);
	}

	return p - text < len - 1 && c != 0;
}

/* should be freed with g_free after done with it */
static gchar *
get_selected_text (EMailReader *reader)
{
	EMFormatHTML *formatter;
	EWebView *web_view;
	gchar *text = NULL;
	gint len;

	formatter = e_mail_reader_get_formatter (reader);
	web_view = em_format_html_get_web_view (formatter);

	if (!e_web_view_is_selection_active (web_view))
		return NULL;

	text = gtk_html_get_selection_plain_text (GTK_HTML (web_view), &len);

	if (text == NULL || !text_contains_nonwhitespace (text, len)) {
		g_free (text);
		return NULL;
	}

	return text;
}

static void
mail_to_event (ECalClientSourceType source_type,
               gboolean with_attendees,
               EMailReader *reader)
{
	CamelFolder *folder;
	GPtrArray *uids;
	ESourceList *source_list = NULL;
	gboolean done = FALSE;
	GSList *groups, *p;
	ESource *source = NULL, *default_source = NULL;
	GError *error = NULL;
	gint writable_sources = 0;

	folder = e_mail_reader_get_folder (reader);
	uids = e_mail_reader_get_selected_uids (reader);

	if (!e_cal_client_get_sources (&source_list, source_type, &error)) {
		e_notice (NULL, GTK_MESSAGE_ERROR, _("Cannot get source list. %s"), error ? error->message : _("Unknown error."));
		if (error)
			g_error_free (error);
		camel_folder_free_uids (folder, uids);
		g_object_unref (folder);
		return;
	}

	/* Ask before converting 10 or more mails to events */
	if (uids->len > 10) {
		gchar *question = g_strdup_printf (get_question_add_all_mails (source_type), uids->len);
		if (do_ask (question, FALSE) == GTK_RESPONSE_NO) {
			g_free (question);
			g_object_unref (source_list);
			camel_folder_free_uids (folder, uids);
			g_object_unref (folder);
			return;
		}
		g_free (question);
	}

	/* Find 'Default' source. When no source is default, ask user to pick one */
	groups = e_source_list_peek_groups (source_list);
	for (p = groups; p != NULL && !done; p = p->next) {
		ESourceGroup *group = E_SOURCE_GROUP (p->data);
		GSList *sources, *q;

		sources = e_source_group_peek_sources (group);
		for (q = sources; q != NULL; q = q->next) {
			ESource *s = E_SOURCE (q->data);

			if (s && e_source_get_property (s, "default") && !e_source_get_readonly (s)) {
				default_source = s;
				done = TRUE;
				break;
			}

			if (s && !e_source_get_readonly (s)) {
				writable_sources++;
				source = s;
			}
		}
	}

	if (!default_source && writable_sources > 1) {
		GtkWidget *dialog;

		/* ask the user which tasks list to save to */
		dialog = e_source_selector_dialog_new (NULL, source_list);

		e_source_selector_dialog_select_default_source (E_SOURCE_SELECTOR_DIALOG (dialog));

		if (gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_OK)
			source = e_source_selector_dialog_peek_primary_selection (E_SOURCE_SELECTOR_DIALOG (dialog));
		else
			source = NULL;

		gtk_widget_destroy (dialog);
	} else if (!source && default_source) {
		source = default_source;
	} else {
		e_notice (NULL, GTK_MESSAGE_ERROR, _("No writable calendar is available."));

		g_object_unref (source_list);
		camel_folder_free_uids (folder, uids);
		g_object_unref (folder);
		if (error)
			g_error_free (error);
		return;
	}

	if (source) {
		/* if a source has been selected, perform the mail2event operation */
		ECalClient *client = NULL;
		AsyncData *data = NULL;
		GThread *thread = NULL;
		GError *error = NULL;

		client = e_cal_client_new (source, source_type, &error);
		if (!client) {
			gchar *uri = e_source_get_uri (source);

			e_notice (NULL, GTK_MESSAGE_ERROR, "Could not create the client '%s': %s", uri, error ? error->message : "Unknown error");

			g_free (uri);
			g_object_unref (source_list);
			camel_folder_free_uids (folder, uids);
			g_object_unref (folder);
			if (error)
				g_error_free (error);
			return;
		}

		g_signal_connect (client, "authenticate", G_CALLBACK (e_client_utils_authenticate_handler), NULL);

		/* Fill the elements in AsynData */
		data = g_new0 (AsyncData, 1);
		data->client = client;
		data->folder = folder;
		data->uids = uids;
		data->with_attendees = with_attendees;

		if (uids->len == 1)
			data->selected_text = get_selected_text (reader);
		else
			data->selected_text = NULL;

		thread = g_thread_create ((GThreadFunc) do_mail_to_event, data, FALSE, &error);
		if (!thread) {
			g_warning (G_STRLOC ": %s", error->message);
			g_error_free (error);
		}
	}

	g_object_unref (source_list);
}

static void
action_mail_convert_to_event_cb (GtkAction *action,
                                 EMailReader *reader)
{
	mail_to_event (E_CAL_CLIENT_SOURCE_TYPE_EVENTS, FALSE, reader);
}

static void
action_mail_convert_to_meeting_cb (GtkAction *action,
                                   EMailReader *reader)
{
	mail_to_event (E_CAL_CLIENT_SOURCE_TYPE_EVENTS, TRUE, reader);
}

static void
action_mail_convert_to_memo_cb (GtkAction *action,
                                EMailReader *reader)
{
	mail_to_event (E_CAL_CLIENT_SOURCE_TYPE_MEMOS, FALSE, reader);
}

static void
action_mail_convert_to_task_cb (GtkAction *action,
                                EMailReader *reader)
{
	mail_to_event (E_CAL_CLIENT_SOURCE_TYPE_TASKS, FALSE, reader);
}

/* Note, we're not using EPopupActions here because we update the state
 * of entire actions groups instead of individual actions.  EPopupActions
 * just proxy the state of individual actions. */

static GtkActionEntry multi_selection_entries[] = {

	{ "mail-convert-to-event",
	  "appointment-new",
	  N_("Create an _Event"),
	  NULL,
	  N_("Create a new event from the selected message"),
	  G_CALLBACK (action_mail_convert_to_event_cb) },

	{ "mail-convert-to-memo",
	  "stock_insert-note",
	  N_("Create a Mem_o"),
	  NULL,
	  N_("Create a new memo from the selected message"),
	  G_CALLBACK (action_mail_convert_to_memo_cb) },

	{ "mail-convert-to-task",
	  "stock_todo",
	  N_("Create a _Task"),
	  NULL,
	  N_("Create a new task from the selected message"),
	  G_CALLBACK (action_mail_convert_to_task_cb) }
};

static GtkActionEntry single_selection_entries[] = {

	{ "mail-convert-to-meeting",
	  "stock_new-meeting",
	  N_("Create a _Meeting"),
	  NULL,
	  N_("Create a new meeting from the selected message"),
	  G_CALLBACK (action_mail_convert_to_meeting_cb) }
};

static void
update_actions_any_cb (EMailReader *reader,
                       guint32 state,
                       GtkActionGroup *action_group)
{
	gboolean sensitive;

	sensitive =
		(state & E_MAIL_READER_SELECTION_SINGLE) ||
		(state & E_MAIL_READER_SELECTION_MULTIPLE);

	gtk_action_group_set_sensitive (action_group, sensitive);
}

static void
update_actions_one_cb (EMailReader *reader,
                       guint32 state,
                       GtkActionGroup *action_group)
{
	gboolean sensitive;

	sensitive = (state & E_MAIL_READER_SELECTION_SINGLE);

	gtk_action_group_set_sensitive (action_group, sensitive);
}

static void
setup_actions (EMailReader *reader,
               GtkUIManager *ui_manager)
{
	GtkActionGroup *action_group;
	const gchar *domain = GETTEXT_PACKAGE;

	action_group = gtk_action_group_new ("mail-convert-any");
	gtk_action_group_set_translation_domain (action_group, domain);
	gtk_action_group_add_actions (
		action_group, multi_selection_entries,
		G_N_ELEMENTS (multi_selection_entries), reader);
	gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
	g_object_unref (action_group);

	/* GtkUIManager now owns the action group reference.
	 * The signal we're connecting to will only be emitted
	 * during the GtkUIManager's lifetime, so the action
	 * group will not disappear on us. */

	g_signal_connect (
		reader, "update-actions",
		G_CALLBACK (update_actions_any_cb), action_group);

	action_group = gtk_action_group_new ("mail-convert-one");
	gtk_action_group_set_translation_domain (action_group, domain);
	gtk_action_group_add_actions (
		action_group, single_selection_entries,
		G_N_ELEMENTS (single_selection_entries), reader);
	gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
	g_object_unref (action_group);

	/* GtkUIManager now owns the action group reference.
	 * The signal we're connecting to will only be emitted
	 * during the GtkUIManager's lifetime, so the action
	 * group will not disappear on us. */

	g_signal_connect (
		reader, "update-actions",
		G_CALLBACK (update_actions_one_cb), action_group);
}

gboolean
mail_browser_init (GtkUIManager *ui_manager,
                   EMailBrowser *browser)
{
	setup_actions (E_MAIL_READER (browser), ui_manager);

	return TRUE;
}

gboolean
mail_shell_view_init (GtkUIManager *ui_manager,
                      EShellView *shell_view)
{
	EShellContent *shell_content;

	shell_content = e_shell_view_get_shell_content (shell_view);

	setup_actions (E_MAIL_READER (shell_content), ui_manager);

	return TRUE;
}
