/*
 * Evolution calendar - Widget utilities
 *
 * 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:
 *		Federico Mena-Quintero <federico@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <ctype.h>
#include <string.h>
#include <libical/ical.h>
#include <glib/gi18n.h>

#include "shell/e-shell.h"

#include "../itip-utils.h"
#include "comp-editor-util.h"

/**
 * comp_editor_dates:
 * @dates: A structure to be filled out with dates of a component
 * @comp: The component to extract the dates from
 *
 * Extracts the dates from the calendar component into the
 * CompEditorPageDates structure. Call comp_editor_free_dates() to free the
 * results.
 **/
void
comp_editor_dates (CompEditorPageDates *dates,
                   ECalComponent *comp)
{
	ECalComponentDateTime dt;

	dates->start = NULL;
	dates->end = NULL;
	dates->due = NULL;
	dates->complete = NULL;

	/* Note that the ECalComponentDateTime's returned contain allocated
	 * icaltimetype and tzid values, so we just take over ownership of
	 * those. */
	e_cal_component_get_dtstart (comp, &dt);
	if (dt.value) {
		dates->start = g_new (ECalComponentDateTime, 1);
		*dates->start = dt;
	}

	e_cal_component_get_dtend (comp, &dt);
	if (dt.value) {
		dates->end = g_new (ECalComponentDateTime, 1);
		*dates->end = dt;
	}

	e_cal_component_get_due (comp, &dt);
	if (dt.value) {
		dates->due = g_new (ECalComponentDateTime, 1);
		*dates->due = dt;
	}

	e_cal_component_get_completed (comp, &dates->complete);
}

/* This frees the dates in the CompEditorPageDates struct. But it doesn't free
 * the struct (as that is usually static).
 */
void
comp_editor_free_dates (CompEditorPageDates *dates)
{
	/* Note that e_cal_component_free_datetime() only frees the fields in
	 * the struct. It doesn't free the struct itself, so we do that. */
	if (dates->start) {
		e_cal_component_free_datetime (dates->start);
		g_free (dates->start);
	}

	if (dates->end) {
		e_cal_component_free_datetime (dates->end);
		g_free (dates->end);
	}

	if (dates->due) {
		e_cal_component_free_datetime (dates->due);
		g_free (dates->due);
	}

	if (dates->complete)
		e_cal_component_free_icaltimetype (dates->complete);
}

/**
 * comp_editor_new_date_edit:
 * @show_date: Whether to show a date picker in the widget.
 * @show_time: Whether to show a time picker in the widget.
 * @make_time_insensitive: Whether the time field is made insensitive rather
 * than hiding it. This is useful if you want to preserve the layout of the
 * widgets.
 *
 * Creates a new #EDateEdit widget, configured using the calendar's preferences.
 *
 * Return value: A newly-created #EDateEdit widget.
 **/
GtkWidget *
comp_editor_new_date_edit (gboolean show_date,
                           gboolean show_time,
                           gboolean make_time_insensitive)
{
	EDateEdit *dedit;

	dedit = E_DATE_EDIT (e_date_edit_new ());

	e_date_edit_set_show_date (dedit, show_date);
	e_date_edit_set_show_time (dedit, show_time);
#if 0
	e_date_edit_set_make_time_insensitive (dedit, make_time_insensitive);
#else
	e_date_edit_set_make_time_insensitive (dedit, FALSE);
#endif

	return GTK_WIDGET (dedit);
}

/* Returns the current time, for EDateEdit widgets and ECalendar items in the
 * dialogs.
 * FIXME: Should probably use the timezone from somewhere in the component
 * rather than the current timezone. */
struct tm
comp_editor_get_current_time (EDateEdit *date_edit,
                              CompEditor *editor)
{
	icaltimezone *zone;
	struct icaltimetype tt;
	struct tm tmp_tm = { 0 };

	/* Get the current timezone. */
	zone = comp_editor_get_timezone (editor);

	tt = icaltime_from_timet_with_zone (time (NULL), FALSE, zone);

	/* Now copy it to the struct tm and return it. */
	tmp_tm.tm_year  = tt.year - 1900;
	tmp_tm.tm_mon   = tt.month - 1;
	tmp_tm.tm_mday  = tt.day;
	tmp_tm.tm_hour  = tt.hour;
	tmp_tm.tm_min   = tt.minute;
	tmp_tm.tm_sec   = tt.second;
	tmp_tm.tm_isdst = -1;

	return tmp_tm;
}

/**
 * comp_editor_strip_categories:
 * @categories: A string of category names entered by the user.
 *
 * Takes a string of the form "categ, categ, categ, ..." and removes the
 * whitespace between categories to result in "categ,categ,categ,..."
 *
 * Return value: The category names stripped of surrounding whitespace
 * and separated with commas.
 **/
gchar *
comp_editor_strip_categories (const gchar *categories)
{
	gchar *new_categories;
	const gchar *start, *end;
	const gchar *p;
	gchar *new_p;

	if (!categories)
		return NULL;

	new_categories = g_new (char, strlen (categories) + 1);

	start = end = NULL;
	new_p = new_categories;

	for (p = categories; *p; p = g_utf8_next_char (p)) {
		gunichar c;

		c = g_utf8_get_char (p);

		if (g_unichar_isspace (c))
			continue;
		else if (c == ',') {
			gint len;

			if (!start)
				continue;

			g_return_val_if_fail (start <= end, NULL);

			len = end - start + 1;
			strncpy (new_p, start, len);
			new_p[len] = ',';
			new_p += len + 1;

			start = end = NULL;
		} else {
			if (!start) {
				start = p;
				end = p;
			} else
				end = g_utf8_next_char (p) - 1;
		}
	}

	if (start) {
		gint len;

		g_return_val_if_fail (start <= end, NULL);

		len = end - start + 1;
		strncpy (new_p, start, len);
		new_p += len;
	}

	*new_p = '\0';

	return new_categories;
}

static GSList *
manage_new_attendees (const GSList *lst,
                      const gchar *eml,
                      gboolean add)
{
	GSList *copy = NULL;
	const GSList *l;
	gboolean found = FALSE;

	g_return_val_if_fail (eml != NULL, NULL);

	for (l = lst; l; l = l->next) {
		const gchar *eml2 = l->data;

		if (!eml2)
			continue;

		if (g_ascii_strcasecmp (eml, eml2) == 0) {
			found = TRUE;
			if (add)
				copy = g_slist_append (copy, g_strdup (eml2));
		} else {
			copy = g_slist_append (copy, g_strdup (eml2));
		}
	}

	if (!found && add) {
		copy = g_slist_append (copy, g_strdup (eml));
	}

	return copy;
}

static void
free_slist_strs (gpointer data)
{
	GSList *lst = data;

	if (lst) {
		g_slist_foreach (lst, (GFunc) g_free, NULL);
		g_slist_free (lst);
	}
}

/**
 * comp_editor_manage_new_attendees:
 * @comp: The component.
 * @ma: An attendee.
 * @add: %TRUE to add attendee's email to new-attendees, %FALSE to remove
 * from it.
 *
 * Manages the 'new-attendees' string of new attendees of the component.
 *
 * <note>
 *   <para>
 *     The list is just string of emails separated by ';'
 *   </para>
 * </note>
 **/
void
comp_editor_manage_new_attendees (ECalComponent *comp,
                                  EMeetingAttendee *ma,
                                  gboolean add)
{
	const gchar *eml;

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

	eml = e_meeting_attendee_get_address (ma);
	if (eml)
		eml = itip_strip_mailto (eml);
	g_return_if_fail (eml != NULL);

	g_object_set_data_full (
		G_OBJECT (comp), "new-attendees",
		manage_new_attendees (
			g_object_get_data (G_OBJECT (comp), "new-attendees"),
			eml, add), free_slist_strs);
}

/**
 * comp_editor_copy_new_attendees:
 * @des: Component, to copy to.
 * @src: Component, to copy from.
 *
 * Copies "new-attendees" information from @src to @des component.
 **/
void
comp_editor_copy_new_attendees (ECalComponent *des,
                                ECalComponent *src)
{
	GSList *copy = NULL, *l;

	g_return_if_fail (src != NULL);
	g_return_if_fail (des != NULL);

	for (l = g_object_get_data (G_OBJECT (src), "new-attendees"); l; l = l->next) {
		copy = g_slist_append (copy, g_strdup (l->data));
	}

	g_object_set_data_full (G_OBJECT (des), "new-attendees", copy, free_slist_strs);
}

/**
 * comp_editor_have_in_new_attendees:
 * @comp: Component with the "new-attendees" possibly set.
 * @ma: Meeting attendee to check.
 *
 * Returns: Whether @ma is present in the list of new attendees of the comp.
 **/
gboolean
comp_editor_have_in_new_attendees (ECalComponent *comp,
                                   EMeetingAttendee *ma)
{
	const gchar *eml;

	g_return_val_if_fail (comp != NULL, FALSE);
	g_return_val_if_fail (ma != NULL, FALSE);

	eml = e_meeting_attendee_get_address (ma);
	if (eml)
		eml = itip_strip_mailto (eml);
	g_return_val_if_fail (eml != NULL, FALSE);

	return comp_editor_have_in_new_attendees_lst (
		g_object_get_data (G_OBJECT (comp), "new-attendees"), eml);
}

/**
 * comp_editor_have_in_new_attendees_lst:
 *
 * Same as comp_editor_have_in_new_attendees() only parameters are
 * direct GSList and string.
 **/
gboolean
comp_editor_have_in_new_attendees_lst (const GSList *new_attendees,
                                       const gchar *eml)
{
	const GSList *l;

	if (!eml)
		return FALSE;

	for (l = new_attendees; l; l = l->next) {
		if (l->data && g_ascii_strcasecmp (eml, l->data) == 0)
			return TRUE;
	}

	return FALSE;
}

/**
 * comp_editor_test_time_in_the_past:
 * @time_tt: Time to check.
 * @parent: Parent window for a question dialog.
 * @tag: Question message tag to use.
 * Returns whether given time is in the past.
 *
 * Tests the given @time_tt whether occurs in the past,
 * and if so, returns TRUE.
 **/
gboolean
comp_editor_test_time_in_the_past (const struct icaltimetype time_tt)
{
	struct icaltimetype now_tt;
	gboolean is_past;

	if (icaltime_is_null_time (time_tt))
		return FALSE;

	if (time_tt.is_date) {
		now_tt = icaltime_today ();
		is_past = icaltime_compare_date_only (time_tt, now_tt) < 0;
	} else {
		now_tt = icaltime_current_time_with_zone (time_tt.zone);
		now_tt.zone = time_tt.zone;
		is_past = icaltime_compare (time_tt, now_tt) < 0;
	}

	return is_past;
}