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/* Evolution calendar - Scheduling page
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Authors: Federico Mena-Quintero <federico@ximian.com>
 *          Miguel de Icaza <miguel@ximian.com>
 *          Seth Alves <alves@hungry.com>
 *          JP Rosevear <jpr@ximian.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

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

#include <glib.h>
#include <gtk/gtksignal.h>
#include <gtk/gtktogglebutton.h>
#include <gtk/gtkvbox.h>
#include <gtk/gtkwindow.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-i18n.h>
#include <libgnomeui/gnome-stock.h>
#include <libgnomeui/gnome-dialog-util.h>
#include <glade/glade.h>
#include <gal/e-table/e-cell-combo.h>
#include <gal/e-table/e-cell-text.h>
#include <gal/e-table/e-table-simple.h>
#include <gal/e-table/e-table-scrolled.h>
#include <gal/widgets/e-unicode.h>
#include <gal/widgets/e-popup-menu.h>
#include <gal/widgets/e-gui-utils.h>
#include <widgets/misc/e-dateedit.h>
#include <e-util/e-dialog-widgets.h>
#include "../e-meeting-time-sel.h"
#include "../itip-utils.h"
#include "comp-editor-util.h"
#include "e-delegate-dialog.h"
#include "schedule-page.h"



/* Private part of the SchedulePage structure */
struct _SchedulePagePrivate {   
    /* Glade XML data */
    GladeXML *xml;

    /* Widgets from the Glade file */
    GtkWidget *main;

    /* Model */
    EMeetingModel *model;
    
    /* Selector */
    EMeetingTimeSelector *sel;
    
    gboolean updating;
};



static void schedule_page_class_init (SchedulePageClass *class);
static void schedule_page_init (SchedulePage *spage);
static void schedule_page_destroy (GtkObject *object);

static GtkWidget *schedule_page_get_widget (CompEditorPage *page);
static void schedule_page_focus_main_widget (CompEditorPage *page);
static void schedule_page_fill_widgets (CompEditorPage *page, CalComponent *comp);
static gboolean schedule_page_fill_component (CompEditorPage *page, CalComponent *comp);
static void schedule_page_set_dates (CompEditorPage *page, CompEditorPageDates *dates);

static void time_changed_cb (GtkWidget *widget, gpointer data);

static CompEditorPageClass *parent_class = NULL;



/**
 * schedule_page_get_type:
 * 
 * Registers the #SchedulePage class if necessary, and returns the type ID
 * associated to it.
 * 
 * Return value: The type ID of the #SchedulePage class.
 **/
GtkType
schedule_page_get_type (void)
{
    static GtkType schedule_page_type;

    if (!schedule_page_type) {
        static const GtkTypeInfo schedule_page_info = {
            "SchedulePage",
            sizeof (SchedulePage),
            sizeof (SchedulePageClass),
            (GtkClassInitFunc) schedule_page_class_init,
            (GtkObjectInitFunc) schedule_page_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        schedule_page_type = 
            gtk_type_unique (TYPE_COMP_EDITOR_PAGE,
                     &schedule_page_info);
    }

    return schedule_page_type;
}

/* Class initialization function for the schedule page */
static void
schedule_page_class_init (SchedulePageClass *class)
{
    CompEditorPageClass *editor_page_class;
    GtkObjectClass *object_class;

    editor_page_class = (CompEditorPageClass *) class;
    object_class = (GtkObjectClass *) class;

    parent_class = gtk_type_class (TYPE_COMP_EDITOR_PAGE);

    editor_page_class->get_widget = schedule_page_get_widget;
    editor_page_class->focus_main_widget = schedule_page_focus_main_widget;
    editor_page_class->fill_widgets = schedule_page_fill_widgets;
    editor_page_class->fill_component = schedule_page_fill_component;
    editor_page_class->set_summary = NULL;
    editor_page_class->set_dates = schedule_page_set_dates;

    object_class->destroy = schedule_page_destroy;
}

/* Object initialization function for the schedule page */
static void
schedule_page_init (SchedulePage *spage)
{
    SchedulePagePrivate *priv;

    priv = g_new0 (SchedulePagePrivate, 1);
    spage->priv = priv;

    priv->xml = NULL;

    priv->main = NULL;

    priv->updating = FALSE;
}

/* Destroy handler for the schedule page */
static void
schedule_page_destroy (GtkObject *object)
{
    SchedulePage *spage;
    SchedulePagePrivate *priv;
    
    g_return_if_fail (object != NULL);
    g_return_if_fail (IS_SCHEDULE_PAGE (object));

    spage = SCHEDULE_PAGE (object);
    priv = spage->priv;

    if (priv->xml) {
        gtk_object_unref (GTK_OBJECT (priv->xml));
        priv->xml = NULL;
    }

    gtk_object_unref (GTK_OBJECT (priv->model));

    g_free (priv);
    spage->priv = NULL;

    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}



/* get_widget handler for the schedule page */
static GtkWidget *
schedule_page_get_widget (CompEditorPage *page)
{
    SchedulePage *spage;
    SchedulePagePrivate *priv;

    spage = SCHEDULE_PAGE (page);
    priv = spage->priv;

    return priv->main;
}

/* focus_main_widget handler for the schedule page */
static void
schedule_page_focus_main_widget (CompEditorPage *page)
{
    SchedulePage *spage;
    SchedulePagePrivate *priv;

    spage = SCHEDULE_PAGE (page);
    priv = spage->priv;

    gtk_widget_grab_focus (GTK_WIDGET (priv->sel));
}

/* Set date/time */
static void
update_time (SchedulePage *spage, CalComponentDateTime *start_date, CalComponentDateTime *end_date) 
{
    SchedulePagePrivate *priv;
    struct icaltimetype *start_tt, *end_tt;
    icaltimezone *start_zone = NULL, *end_zone = NULL;
    CalClientGetStatus status;

    priv = spage->priv;
    
    /* Note that if we are creating a new event, the timezones may not be
       on the server, so we try to get the builtin timezone with the TZID
       first. */
    start_zone = icaltimezone_get_builtin_timezone_from_tzid (start_date->tzid);
    if (!start_zone) {
        status = cal_client_get_timezone (COMP_EDITOR_PAGE (spage)->client,
                          start_date->tzid,
                          &start_zone);
        /* FIXME: Handle error better. */
        if (status != CAL_CLIENT_GET_SUCCESS)
            g_warning ("Couldn't get timezone from server: %s",
                   start_date->tzid ? start_date->tzid : "");
    }

    end_zone = icaltimezone_get_builtin_timezone_from_tzid (end_date->tzid);
    if (!end_zone) {
        status = cal_client_get_timezone (COMP_EDITOR_PAGE (spage)->client,
                          end_date->tzid,
                          &end_zone);
        /* FIXME: Handle error better. */
        if (status != CAL_CLIENT_GET_SUCCESS)
          g_warning ("Couldn't get timezone from server: %s",
                 end_date->tzid ? end_date->tzid : "");
    }

    start_tt = start_date->value;
    end_tt = end_date->value;
    
    e_date_edit_set_date (E_DATE_EDIT (priv->sel->start_date_edit), start_tt->year,
                  start_tt->month, start_tt->day);
    e_date_edit_set_time_of_day (E_DATE_EDIT (priv->sel->start_date_edit),
                     start_tt->hour, start_tt->minute);

    e_date_edit_set_date (E_DATE_EDIT (priv->sel->end_date_edit), end_tt->year,
                  end_tt->month, end_tt->day);
    e_date_edit_set_time_of_day (E_DATE_EDIT (priv->sel->end_date_edit),
                     end_tt->hour, end_tt->minute);
}

        
/* Fills the widgets with default values */
static void
clear_widgets (SchedulePage *spage)
{
    SchedulePagePrivate *priv;
    
    priv = spage->priv;
}

/* fill_widgets handler for the schedule page */
static void
schedule_page_fill_widgets (CompEditorPage *page, CalComponent *comp)
{
    SchedulePage *spage;
    SchedulePagePrivate *priv;
    CalComponentDateTime start_date, end_date;

    spage = SCHEDULE_PAGE (page);
    priv = spage->priv;

    priv->updating = TRUE;

    /* Clean the screen */
    clear_widgets (spage);

    /* Start and end times */
    cal_component_get_dtstart (comp, &start_date);
    cal_component_get_dtend (comp, &end_date);
    update_time (spage, &start_date, &end_date);
    
    cal_component_free_datetime (&start_date);
    cal_component_free_datetime (&end_date);
    
    priv->updating = FALSE;
}

/* fill_component handler for the schedule page */
static gboolean
schedule_page_fill_component (CompEditorPage *page, CalComponent *comp)
{
    SchedulePage *spage;
    SchedulePagePrivate *priv;
    
    spage = SCHEDULE_PAGE (page);
    priv = spage->priv;

    return TRUE;
}

static void
schedule_page_set_dates (CompEditorPage *page, CompEditorPageDates *dates)
{
    SchedulePage *spage;
    SchedulePagePrivate *priv;
    
    spage = SCHEDULE_PAGE (page);
    priv = spage->priv;

    priv->updating = TRUE;
    
    update_time (spage, dates->start, dates->end);

    priv->updating = FALSE;
}



/* Gets the widgets from the XML file and returns if they are all available. */
static gboolean
get_widgets (SchedulePage *spage)
{
    SchedulePagePrivate *priv;

    priv = spage->priv;

#define GW(name) glade_xml_get_widget (priv->xml, name)

    priv->main = GW ("schedule-page");
    if (!priv->main)
        return FALSE;

    gtk_widget_ref (priv->main);
    gtk_widget_unparent (priv->main);

#undef GW

    return TRUE;
}

static gboolean
init_widgets (SchedulePage *spage) 
{
    SchedulePagePrivate *priv;

    priv = spage->priv;

    gtk_signal_connect (GTK_OBJECT (priv->sel->start_date_edit), 
                "changed", time_changed_cb, spage);
    gtk_signal_connect (GTK_OBJECT (priv->sel->end_date_edit), 
                "changed", time_changed_cb, spage);

    return TRUE;
    
}



/**
 * schedule_page_construct:
 * @spage: An schedule page.
 * 
 * Constructs an schedule page by loading its Glade data.
 * 
 * Return value: The same object as @spage, or NULL if the widgets could not 
 * be created.
 **/
SchedulePage *
schedule_page_construct (SchedulePage *spage, EMeetingModel *emm)
{
    SchedulePagePrivate *priv;
    
    priv = spage->priv;

    priv->xml = glade_xml_new (EVOLUTION_GLADEDIR 
                   "/schedule-page.glade", NULL);
    if (!priv->xml) {
        g_message ("schedule_page_construct(): "
               "Could not load the Glade XML file!");
        return NULL;
    }

    if (!get_widgets (spage)) {
        g_message ("schedule_page_construct(): "
               "Could not find all widgets in the XML file!");
        return NULL;
    }

    /* Model */
    gtk_object_ref (GTK_OBJECT (emm));
    priv->model = emm;
    
    /* Selector */
    priv->sel = E_MEETING_TIME_SELECTOR (e_meeting_time_selector_new (emm));
    gtk_widget_show (GTK_WIDGET (priv->sel));
    gtk_box_pack_start (GTK_BOX (priv->main), GTK_WIDGET (priv->sel), TRUE, TRUE, 2);

    if (!init_widgets (spage)) {
        g_message ("schedule_page_construct(): " 
               "Could not initialize the widgets!");
        return NULL;
    }

    return spage;
}

/**
 * schedule_page_new:
 * 
 * Creates a new schedule page.
 * 
 * Return value: A newly-created schedule page, or NULL if the page could
 * not be created.
 **/
SchedulePage *
schedule_page_new (EMeetingModel *emm)
{
    SchedulePage *spage;

    spage = gtk_type_new (TYPE_SCHEDULE_PAGE);
    if (!schedule_page_construct (spage, emm)) {
        gtk_object_unref (GTK_OBJECT (spage));
        return NULL;
    }

    return spage;
}

static void
time_changed_cb (GtkWidget *widget, gpointer data)
{
    SchedulePage *spage = data;
    SchedulePagePrivate *priv;
    CompEditorPageDates dates;
    CalComponentDateTime start_dt, end_dt;
    struct icaltimetype start_tt, end_tt;
    
    priv = spage->priv;

    if (priv->updating)
        return;
    
    e_date_edit_get_date (E_DATE_EDIT (priv->sel->start_date_edit),
                  &start_tt.year,
                  &start_tt.month,
                  &start_tt.day);
    e_date_edit_get_time_of_day (E_DATE_EDIT (priv->sel->start_date_edit),
                     &start_tt.hour,
                     &start_tt.minute);
    e_date_edit_get_date (E_DATE_EDIT (priv->sel->end_date_edit),
                  &end_tt.year,
                  &end_tt.month,
                  &end_tt.day);
    e_date_edit_get_time_of_day (E_DATE_EDIT (priv->sel->end_date_edit),
                     &end_tt.hour,
                     &end_tt.minute);

    start_dt.value = &start_tt;
    end_dt.value = &end_tt;

    start_dt.tzid = NULL;
    end_dt.tzid = NULL;

    dates.start = &start_dt;
    dates.end = &end_dt;    
    dates.due = NULL;
    dates.complete = NULL;

    comp_editor_page_notify_dates_changed (COMP_EDITOR_PAGE (spage),
                           &dates);
}