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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-cal-shell-sidebar.c
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU 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 General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "e-cal-shell-sidebar.h"

#include <string.h>
#include <glib/gi18n.h>
#include <libecal/e-cal-time-util.h>
#include <libedataserver/e-data-server-util.h>
#include <libedataserverui/e-source-selector.h>

#include <e-util/e-util.h>

#include <gnome-cal.h>
#include <e-cal-shell-view.h>
#include <e-calendar-selector.h>

#define E_CAL_SHELL_SIDEBAR_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_CAL_SHELL_SIDEBAR, ECalShellSidebarPrivate))

struct _ECalShellSidebarPrivate {
    GtkWidget *selector;
};

enum {
    PROP_0,
    PROP_SELECTOR
};

static gpointer parent_class;

static void
cal_shell_sidebar_update (EShellSidebar *shell_sidebar)
{
    EShellView *shell_view;
    GnomeCalendar *calendar;
    GnomeCalendarViewType view;
    time_t start_time, end_time;
    struct tm start_tm, end_tm;
    struct icaltimetype start_tt, end_tt;
    icaltimezone *timezone;
    gchar buffer[512];
    gchar end_buffer[512];

    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    calendar = e_cal_shell_view_get_calendar (
        E_CAL_SHELL_VIEW (shell_view));

    gnome_calendar_get_visible_time_range (
        calendar, &start_time, &end_time);
    timezone = gnome_calendar_get_timezone (calendar);
    view = gnome_calendar_get_view (calendar);

    start_tt = icaltime_from_timet_with_zone (start_time, FALSE, timezone);
    start_tm.tm_year = start_tt.year - 1900;
    start_tm.tm_mon = start_tt.month - 1;
    start_tm.tm_mday = start_tt.day;
    start_tm.tm_hour = start_tt.hour;
    start_tm.tm_min = start_tt.minute;
    start_tm.tm_sec = start_tt.second;
    start_tm.tm_isdst = -1;
    start_tm.tm_wday = time_day_of_week (
        start_tt.day, start_tt.month - 1, start_tt.year);

    /* Subtract one from end_time so we don't get an extra day. */
    end_tt = icaltime_from_timet_with_zone (end_time - 1, FALSE, timezone);
    end_tm.tm_year = end_tt.year - 1900;
    end_tm.tm_mon = end_tt.month - 1;
    end_tm.tm_mday = end_tt.day;
    end_tm.tm_hour = end_tt.hour;
    end_tm.tm_min = end_tt.minute;
    end_tm.tm_sec = end_tt.second;
    end_tm.tm_isdst = -1;
    end_tm.tm_wday = time_day_of_week (
        end_tt.day, end_tt.month - 1, end_tt.year);

    switch (view) {
        case GNOME_CAL_DAY_VIEW:
        case GNOME_CAL_WORK_WEEK_VIEW:
        case GNOME_CAL_WEEK_VIEW:
            if (start_tm.tm_year == end_tm.tm_year &&
                start_tm.tm_mon == end_tm.tm_mon &&
                start_tm.tm_mday == end_tm.tm_mday) {
                e_utf8_strftime (
                    buffer, sizeof (buffer),
                    _("%A %d %b %Y"), &start_tm);
            } else if (start_tm.tm_year == end_tm.tm_year) {
                e_utf8_strftime (
                    buffer, sizeof (buffer),
                    _("%a %d %b"), &start_tm);
                e_utf8_strftime (
                    end_buffer, sizeof (end_buffer),
                    _("%a %d %b %Y"), &end_tm);
                strcat (buffer, " - ");
                strcat (buffer, end_buffer);
            } else {
                e_utf8_strftime (
                    buffer, sizeof (buffer),
                    _("%a %d %b %Y"), &start_tm);
                e_utf8_strftime (
                    end_buffer, sizeof (end_buffer),
                    _("%a %d %b %Y"), &end_tm);
                strcat (buffer, " - ");
                strcat (buffer, end_buffer);
            }
            break;

        case GNOME_CAL_MONTH_VIEW:
        case GNOME_CAL_LIST_VIEW:
            if (start_tm.tm_year == end_tm.tm_year) {
                if (start_tm.tm_mon == end_tm.tm_mon) {
                    e_utf8_strftime (
                        buffer,
                        sizeof (buffer),
                        "%d", &start_tm);
                    e_utf8_strftime (
                        end_buffer,
                        sizeof (end_buffer),
                        _("%d %b %Y"), &end_tm);
                    strcat (buffer, " - ");
                    strcat (buffer, end_buffer);
                } else {
                    e_utf8_strftime (
                        buffer,
                        sizeof (buffer),
                        _("%d %b"), &start_tm);
                    e_utf8_strftime (
                        end_buffer,
                        sizeof (end_buffer),
                        _("%d %b %Y"), &end_tm);
                    strcat (buffer, " - ");
                    strcat (buffer, end_buffer);
                }
            } else {
                e_utf8_strftime (
                    buffer, sizeof (buffer),
                    _("%d %b %Y"), &start_tm);
                e_utf8_strftime (
                    end_buffer, sizeof (end_buffer),
                    _("%d %b %Y"), &end_tm);
                strcat (buffer, " - ");
                strcat (buffer, end_buffer);
            }
            break;

        default:
            g_return_if_reached ();
    }

    e_shell_sidebar_set_secondary_text (shell_sidebar, buffer);
}

static void
cal_shell_sidebar_get_property (GObject *object,
                                 guint property_id,
                                 GValue *value,
                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_SELECTOR:
            g_value_set_object (
                value, e_cal_shell_sidebar_get_selector (
                E_CAL_SHELL_SIDEBAR (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
cal_shell_sidebar_dispose (GObject *object)
{
    ECalShellSidebarPrivate *priv;

    priv = E_CAL_SHELL_SIDEBAR_GET_PRIVATE (object);

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

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

static void
cal_shell_sidebar_constructed (GObject *object)
{
    ECalShellSidebarPrivate *priv;
    EShellView *shell_view;
    EShellSidebar *shell_sidebar;
    ECalShellView *cal_shell_view;
    ESourceList *source_list;
    GtkContainer *container;
    GtkWidget *widget;
    GnomeCalendar *calendar;

    priv = E_CAL_SHELL_SIDEBAR_GET_PRIVATE (object);

    shell_sidebar = E_SHELL_SIDEBAR (object);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    cal_shell_view = E_CAL_SHELL_VIEW (shell_view);
    source_list = e_cal_shell_view_get_source_list (cal_shell_view);

    container = GTK_CONTAINER (shell_sidebar);

    widget = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (
        GTK_SCROLLED_WINDOW (widget),
        GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (
        GTK_SCROLLED_WINDOW (widget), GTK_SHADOW_IN);
    gtk_container_add (container, widget);
    gtk_widget_show (widget);

    container = GTK_CONTAINER (widget);

    widget = e_calendar_selector_new (source_list);
    e_source_selector_set_select_new (E_SOURCE_SELECTOR (widget), TRUE);
    gtk_container_add (container, widget);
    priv->selector = g_object_ref (widget);
    gtk_widget_show (widget);

    /* Setup signal handlers. */

    calendar = e_cal_shell_view_get_calendar (cal_shell_view);

    g_signal_connect_swapped (
        calendar, "dates-shown-changed",
        G_CALLBACK (cal_shell_sidebar_update),
        shell_sidebar);

    cal_shell_sidebar_update (shell_sidebar);
}

static void
cal_shell_sidebar_class_init (ECalShellSidebarClass *class)
{
    GObjectClass *object_class;

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

    object_class = G_OBJECT_CLASS (class);
    object_class->get_property = cal_shell_sidebar_get_property;
    object_class->dispose = cal_shell_sidebar_dispose;
    object_class->constructed = cal_shell_sidebar_constructed;

    g_object_class_install_property (
        object_class,
        PROP_SELECTOR,
        g_param_spec_object (
            "selector",
            _("Source Selector Widget"),
            _("This widget displays groups of calendars"),
            E_TYPE_SOURCE_SELECTOR,
            G_PARAM_READABLE));
}

static void
cal_shell_sidebar_init (ECalShellSidebar *cal_shell_sidebar)
{
    cal_shell_sidebar->priv =
        E_CAL_SHELL_SIDEBAR_GET_PRIVATE (cal_shell_sidebar);

    /* Postpone widget construction until we have a shell view. */
}

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

    if (G_UNLIKELY (type == 0)) {
        static const GTypeInfo type_info = {
            sizeof (ECalShellSidebarClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) cal_shell_sidebar_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,  /* class_data */
            sizeof (ECalShellSidebar),
            0,     /* n_preallocs */
            (GInstanceInitFunc) cal_shell_sidebar_init,
            NULL   /* value_table */
        };

        type = g_type_register_static (
            E_TYPE_SHELL_SIDEBAR, "ECalShellSidebar",
            &type_info, 0);
    }

    return type;
}

GtkWidget *
e_cal_shell_sidebar_new (EShellView *shell_view)
{
    g_return_val_if_fail (E_IS_SHELL_VIEW (shell_view), NULL);

    return g_object_new (
        E_TYPE_CAL_SHELL_SIDEBAR,
        "shell-view", shell_view, NULL);
}

GtkWidget *
e_cal_shell_sidebar_get_selector (ECalShellSidebar *cal_shell_sidebar)
{
    g_return_val_if_fail (
        E_IS_CAL_SHELL_SIDEBAR (cal_shell_sidebar), NULL);

    return cal_shell_sidebar->priv->selector;
}