/*
 * ECellDateEditText - a subclass of ECellText used to show and edit the text
 * representation of the date, from a ECalComponentDateTime* model value.
 *
 * 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:
 *		Damon Chaplin <damon@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 */

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

#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <glib/gi18n.h>
#include <libedataserver/e-time-utils.h>
#include <libedataserver/e-data-server-util.h>
#include <e-util/e-util.h>
#include <e-util/e-datetime-format.h>
#include <libecal/e-cal-time-util.h>

#include "e-cell-date-edit-text.h"

struct _ECellDateEditTextPrivate {

	/* The timezone to display the date in. */
	icaltimezone *timezone;

	/* Whether to display in 24-hour format. */
	gboolean use_24_hour_format;
};

enum {
	PROP_0,
	PROP_TIMEZONE,
	PROP_USE_24_HOUR_FORMAT
};

static gpointer parent_class;

static void
cell_date_edit_text_set_property (GObject *object,
                                  guint property_id,
                                  const GValue *value,
                                  GParamSpec *pspec)
{
	switch (property_id) {
		case PROP_TIMEZONE:
			e_cell_date_edit_text_set_timezone (
				E_CELL_DATE_EDIT_TEXT (object),
				g_value_get_pointer (value));
			return;

		case PROP_USE_24_HOUR_FORMAT:
			e_cell_date_edit_text_set_use_24_hour_format (
				E_CELL_DATE_EDIT_TEXT (object),
				g_value_get_boolean (value));
			return;
	}

	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
cell_date_edit_text_get_property (GObject *object,
                                  guint property_id,
                                  GValue *value,
                                  GParamSpec *pspec)
{
	switch (property_id) {
		case PROP_TIMEZONE:
			g_value_set_pointer (
				value,
				e_cell_date_edit_text_get_timezone (
				E_CELL_DATE_EDIT_TEXT (object)));
			return;

		case PROP_USE_24_HOUR_FORMAT:
			g_value_set_boolean (
				value,
				e_cell_date_edit_text_get_use_24_hour_format (
				E_CELL_DATE_EDIT_TEXT (object)));
			return;
	}

	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static gchar *
cell_date_edit_text_get_text (ECellText *cell,
                              ETableModel *model,
                              gint col,
                              gint row)
{
	ECellDateEditText *ecd = E_CELL_DATE_EDIT_TEXT (cell);
	ECellDateEditValue *dv = e_table_model_value_at (model, col, row);
	icaltimezone *timezone;
	struct tm tmp_tm;

	if (!dv)
		return g_strdup ("");

	timezone = e_cell_date_edit_text_get_timezone (ecd);

	/* Note that although the property may be in a different
	   timezone, we convert it to the current timezone to display
	   it in the table. If the user actually edits the value,
	   it will be set to the current timezone. See set_value (). */
	tmp_tm = icaltimetype_to_tm_with_zone (&dv->tt, dv->zone, timezone);

	return e_datetime_format_format_tm (
		"calendar", "table", dv->tt.is_date ?
		DTFormatKindDate : DTFormatKindDateTime, &tmp_tm);
}

static void
cell_date_edit_text_free_text (ECellText *cell,
                               gchar *text)
{
	g_free (text);
}

/* FIXME: We need to set the "transient_for" property for the dialog. */
static void
show_date_warning (ECellDateEditText *ecd)
{
	GtkWidget *dialog;
	gchar buffer[64], *format;
	time_t t;
	struct tm *tmp_tm;

	t = time (NULL);
	/* We are only using this as an example, so the timezone doesn't
	   matter. */
	tmp_tm = localtime (&t);

	if (e_cell_date_edit_text_get_use_24_hour_format (ecd))
		/* strftime format of a weekday, a date and a time, 24-hour. */
		format = _("%a %m/%d/%Y %H:%M:%S");
	else
		/* strftime format of a weekday, a date and a time, 12-hour. */
		format = _("%a %m/%d/%Y %I:%M:%S %p");

	e_utf8_strftime (buffer, sizeof (buffer), format, tmp_tm);

	dialog = gtk_message_dialog_new (
		NULL, 0,
		GTK_MESSAGE_ERROR,
		GTK_BUTTONS_OK,
		_("The date must be entered in the format: \n%s"),
		buffer);
	gtk_dialog_run (GTK_DIALOG (dialog));
	gtk_widget_destroy (dialog);
}

static void
cell_date_edit_text_set_value (ECellText *cell,
                               ETableModel *model,
                               gint col,
                               gint row,
                               const gchar *text)
{
	ECellDateEditText *ecd = E_CELL_DATE_EDIT_TEXT (cell);
	ETimeParseStatus status;
	struct tm tmp_tm;
	ECellDateEditValue *value;
	gboolean is_date = TRUE;

	/* Try to parse just a date first. If the value is only a date, we
	   use a DATE value. */
	status = e_time_parse_date (text, &tmp_tm);
	if (status == E_TIME_PARSE_INVALID) {
		is_date = FALSE;
		status = e_time_parse_date_and_time (text, &tmp_tm);

		if (status == E_TIME_PARSE_INVALID) {
			show_date_warning (ecd);
			return;
		}
	}

	if (status == E_TIME_PARSE_NONE) {
		value = NULL;
	} else {
		ECellDateEditValue dv;

		dv.tt = icaltime_null_time ();

		dv.tt.year   = tmp_tm.tm_year + 1900;
		dv.tt.month  = tmp_tm.tm_mon + 1;
		dv.tt.day    = tmp_tm.tm_mday;
		dv.tt.hour   = tmp_tm.tm_hour;
		dv.tt.minute = tmp_tm.tm_min;
		dv.tt.second = tmp_tm.tm_sec;
		dv.tt.is_date = is_date;

		/* FIXME: We assume it is being set to the current timezone.
		   Is that OK? */
		if (is_date) {
			dv.zone = NULL;
		} else {
			dv.zone = e_cell_date_edit_text_get_timezone (ecd);
		}

		value = &dv;
	}

	e_table_model_set_value_at (model, col, row, value);
}

static void
cell_date_edit_text_class_init (ECellDateEditTextClass *class)
{
	GObjectClass *object_class;
	ECellTextClass *cell_text_class;

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

	object_class = G_OBJECT_CLASS (class);
	object_class->set_property = cell_date_edit_text_set_property;
	object_class->get_property = cell_date_edit_text_get_property;

	cell_text_class = E_CELL_TEXT_CLASS (class);
	cell_text_class->get_text  = cell_date_edit_text_get_text;
	cell_text_class->free_text = cell_date_edit_text_free_text;
	cell_text_class->set_value = cell_date_edit_text_set_value;

	g_object_class_install_property (
		object_class,
		PROP_TIMEZONE,
		g_param_spec_pointer (
			"timezone",
			"Time Zone",
			NULL,
			G_PARAM_READWRITE));

	g_object_class_install_property (
		object_class,
		PROP_USE_24_HOUR_FORMAT,
		g_param_spec_boolean (
			"use-24-hour-format",
			"Use 24-Hour Format",
			NULL,
			TRUE,
			G_PARAM_READWRITE));
}

static void
cell_date_edit_text_init (ECellDateEditText *ecd)
{
	ecd->priv = G_TYPE_INSTANCE_GET_PRIVATE (ecd, E_TYPE_CELL_DATE_EDIT_TEXT, ECellDateEditTextPrivate);

	ecd->priv->timezone = icaltimezone_get_utc_timezone ();
	ecd->priv->use_24_hour_format = TRUE;
}

GType
e_cell_date_edit_text_get_type (void)
{
	static GType type = 0;

	if (G_UNLIKELY (type == 0)) {
		const GTypeInfo type_info = {
			sizeof (ECellDateEditTextClass),
			(GBaseInitFunc) NULL,
			(GBaseFinalizeFunc) NULL,
			(GClassInitFunc) cell_date_edit_text_class_init,
			(GClassFinalizeFunc) NULL,
			NULL,  /* class_data */
			sizeof (ECellDateEditText),
			0,     /* n_preallocs */
			(GInstanceInitFunc) cell_date_edit_text_init,
			NULL   /* value_table */
		};

		type = g_type_register_static (
			E_TYPE_CELL_TEXT, "ECellDateEditText", &type_info, 0);
	}

	return type;
}

/**
 * e_cell_date_edit_text_new:
 *
 * Creates a new ECell renderer that can be used to render and edit dates that
 * that come from the model.  The value returned from the model is
 * interpreted as being a ECalComponentDateTime*.
 *
 * Returns: an ECell object that can be used to render dates.
 */
ECell *
e_cell_date_edit_text_new (const gchar *fontname,
			   GtkJustification justify)
{
	ECell *cell;

	cell = g_object_new (E_TYPE_CELL_DATE_EDIT_TEXT, NULL);
	e_cell_text_construct (E_CELL_TEXT (cell), fontname, justify);

	return cell;
}

icaltimezone *
e_cell_date_edit_text_get_timezone (ECellDateEditText *ecd)
{
	g_return_val_if_fail (E_IS_CELL_DATE_EDIT_TEXT (ecd), NULL);

	return ecd->priv->timezone;
}

void
e_cell_date_edit_text_set_timezone (ECellDateEditText *ecd,
				    icaltimezone *timezone)
{
	g_return_if_fail (E_IS_CELL_DATE_EDIT_TEXT (ecd));

	ecd->priv->timezone = timezone;

	g_object_notify (G_OBJECT (ecd), "timezone");
}

gboolean
e_cell_date_edit_text_get_use_24_hour_format (ECellDateEditText *ecd)
{
	g_return_val_if_fail (E_IS_CELL_DATE_EDIT_TEXT (ecd), FALSE);

	return ecd->priv->use_24_hour_format;
}

void
e_cell_date_edit_text_set_use_24_hour_format (ECellDateEditText *ecd,
					      gboolean use_24_hour)
{
	g_return_if_fail (E_IS_CELL_DATE_EDIT_TEXT (ecd));

	ecd->priv->use_24_hour_format = use_24_hour;

	g_object_notify (G_OBJECT (ecd), "use-24-hour-format");
}

gint
e_cell_date_edit_compare_cb (gconstpointer a, gconstpointer b, gpointer cmp_cache)
{
	ECellDateEditValue *dv1 = (ECellDateEditValue *) a;
	ECellDateEditValue *dv2 = (ECellDateEditValue *) b;
	struct icaltimetype tt;

	/* First check if either is NULL. NULL dates sort last. */
	if (!dv1 || !dv2) {
		if (dv1 == dv2)
			return 0;
		else if (dv1)
			return -1;
		else
			return 1;
	}

	/* Copy the 2nd value and convert it to the same timezone as the first. */
	tt = dv2->tt;

	icaltimezone_convert_time (&tt, dv2->zone, dv1->zone);

	/* Now we can compare them. */
	return icaltime_compare (dv1->tt, tt);
}