/*
 * GnomeCalendar widget
 * Copyright (C) 1998 the Free Software Foundation
 *
 * Author: Miguel de Icaza (miguel@kernel.org)
 */
#include <config.h>
#include <gnome.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include "calendar.h"
#include "gnome-cal.h"
#include "gncal-full-day.h"
#include "gncal-year-view.h"
#include "gncal-week-view.h"
#include "timeutil.h"
#include "views.h"
#include "main.h"

static void gnome_calendar_init                    (GnomeCalendar *gcal);

GnomeApp *parent_class;

guint
gnome_calendar_get_type (void)
{
	static guint gnome_calendar_type = 0;
	if(!gnome_calendar_type) {
		GtkTypeInfo gnome_calendar_info = {
			"GnomeCalendar",
			sizeof(GnomeCalendar),
			sizeof(GnomeCalendarClass),
			(GtkClassInitFunc) NULL,
			(GtkObjectInitFunc) gnome_calendar_init,
			(GtkArgSetFunc) NULL,
			(GtkArgGetFunc) NULL,
		};
		gnome_calendar_type = gtk_type_unique(gnome_app_get_type(), &gnome_calendar_info);
		parent_class = gtk_type_class (gnome_app_get_type());
	}
	return gnome_calendar_type;
}

static void
day_view_range_activated (GncalFullDay *fullday, GnomeCalendar *gcal)
{
	iCalObject *ical;

	ical = ical_new ("", user_name, "");
	ical->new = 1;

	gncal_full_day_selection_range (fullday, &ical->dtstart, &ical->dtend);

	gnome_calendar_add_object (gcal, ical);
	gncal_full_day_focus_child (fullday, ical);
}

static void
set_day_view_label (GnomeCalendar *gcal, time_t t)
{
	static char buf[256];

	strftime (buf, sizeof (buf), "%a %b %d %Y", localtime (&t));
	gtk_label_set (GTK_LABEL (gcal->day_view_label), buf);
}

static void
setup_day_view (GnomeCalendar *gcal, time_t now)
{
	GtkTable  *t;
	GtkWidget *sw;
	
	time_t a, b;
	
	a = time_start_of_day (now);
	b = time_end_of_day (now);
	
	gcal->day_view = gncal_full_day_new (gcal, a, b);
	gtk_signal_connect (GTK_OBJECT (gcal->day_view), "range_activated",
			    (GtkSignalFunc) day_view_range_activated,
			    gcal);

	t = (GtkTable *) gcal->day_view_container = gtk_table_new (0, 0, 0);
	gtk_container_border_width (GTK_CONTAINER (t), 4);
	gtk_table_set_row_spacings (t, 4);
	gtk_table_set_col_spacings (t, 4);
	
	gcal->day_view_label = gtk_label_new ("");
	set_day_view_label (gcal, now);
	gtk_table_attach (t, gcal->day_view_label, 0, 1, 0, 1,
			  GTK_FILL | GTK_SHRINK,
			  GTK_FILL | GTK_SHRINK,
			  0, 0);

	sw = gtk_scrolled_window_new (NULL, NULL);
	gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
					GTK_POLICY_AUTOMATIC,
					GTK_POLICY_AUTOMATIC);
	gtk_table_attach (t, sw, 0, 1, 1, 2,
			  GTK_FILL | GTK_EXPAND | GTK_SHRINK,
			  GTK_FILL | GTK_EXPAND | GTK_SHRINK,
			  0, 0);
	gtk_container_add (GTK_CONTAINER (sw), gcal->day_view);

	gtk_widget_show_all (GTK_WIDGET (t));
}

static void
setup_widgets (GnomeCalendar *gcal)
{
	time_t now;

	now = time (NULL);
	
	gcal->notebook  = gtk_notebook_new ();
	gcal->week_view = gncal_week_view_new (gcal, now);
	gcal->year_view = gncal_year_view_new (gcal, now);
	gcal->task_view = tasks_create (gcal);

	setup_day_view (gcal, now);
	
	gtk_notebook_append_page (GTK_NOTEBOOK (gcal->notebook), gcal->day_view_container,  gtk_label_new (_("Day View")));
	gtk_notebook_append_page (GTK_NOTEBOOK (gcal->notebook), gcal->week_view, gtk_label_new (_("Week View")));
	gtk_notebook_append_page (GTK_NOTEBOOK (gcal->notebook), gcal->year_view, gtk_label_new (_("Year View")));
/*	gtk_notebook_append_page (GTK_NOTEBOOK (gcal->notebook), gcal->task_view, gtk_label_new (_("Todo"))); */

	gtk_widget_show_all (gcal->notebook);
	
	gnome_app_set_contents (GNOME_APP (gcal), gcal->notebook);
	
}

static void
gnome_calendar_init(GnomeCalendar *gcal)
{
	gcal->cal = 0;
	gcal->day_view = 0;
	gcal->week_view = 0;
	gcal->year_view = 0;
	gcal->event_editor = 0;
}

static GtkWidget *
get_current_page (GnomeCalendar *gcal)
{
	return GTK_NOTEBOOK (gcal->notebook)->cur_page->child;
}

void
gnome_calendar_goto (GnomeCalendar *gcal, time_t new_time)
{
	GtkWidget *current = get_current_page (gcal);
	g_assert (new_time != -1);

	if (current == gcal->week_view)
		gncal_week_view_set (GNCAL_WEEK_VIEW (gcal->week_view), new_time);
	else if (current == gcal->day_view_container){
		gncal_full_day_set_bounds (GNCAL_FULL_DAY (gcal->day_view),
					   time_start_of_day (new_time),
					   time_end_of_day (new_time));
		set_day_view_label (gcal, new_time);
	} else if (current == gcal->year_view)
		gncal_year_view_set (GNCAL_YEAR_VIEW (gcal->year_view), new_time);
	else
		printf ("My penguin is gone!\n");
	gcal->current_display = new_time;
}

static void
gnome_calendar_direction (GnomeCalendar *gcal, int direction)
{
	GtkWidget *cp = get_current_page (gcal);
	time_t new_time;
	
	if (cp == gcal->week_view)
		new_time = time_add_day (gcal->current_display, 7 * direction);
	else if (cp == gcal->day_view_container)
		new_time = time_add_day (gcal->current_display, 1 * direction);
	else if (cp == gcal->year_view)
		new_time = time_add_year (gcal->current_display, 1 * direction);
	else
		g_warning ("Weee!  Where did the penguin go?");
	
	gnome_calendar_goto (gcal, new_time);
}

void
gnome_calendar_next (GnomeCalendar *gcal)
{
gnome_calendar_direction (gcal, 1);
}

void
gnome_calendar_previous (GnomeCalendar *gcal)
{
	gnome_calendar_direction (gcal, -1);
}

void
gnome_calendar_dayjump (GnomeCalendar *gcal, time_t time)
{
	gtk_notebook_set_page (GTK_NOTEBOOK (gcal->notebook), 0);
	gnome_calendar_goto (gcal, time);
}

GtkWidget *
gnome_calendar_new (char *title)
{
	GtkWidget      *retval;
	GnomeCalendar  *gcal;
	GnomeApp       *app;
		
	retval = gtk_type_new (gnome_calendar_get_type ());
	app = GNOME_APP (retval);
	gcal = GNOME_CALENDAR (retval);
	
	app->name = g_strdup ("calendar");
	app->prefix = g_copy_strings ("/", app->name, "/", NULL);
	
	gtk_window_set_title(GTK_WINDOW(retval), title);

	gcal->current_display = time (NULL);
	gcal->cal = calendar_new (title);
	setup_widgets (gcal);
	return retval;
}

static void
gnome_calendar_update_all (GnomeCalendar *cal, iCalObject *object, int flags)
{
	gncal_full_day_update  (GNCAL_FULL_DAY  (cal->day_view),  object, flags);
	gncal_week_view_update (GNCAL_WEEK_VIEW (cal->week_view), object, flags);
	gncal_year_view_update (GNCAL_YEAR_VIEW (cal->year_view), object, flags);
}

int
gnome_calendar_load (GnomeCalendar *gcal, char *file)
{
	char *r;
	
	if ((r = calendar_load (gcal->cal, file)) != NULL){
		printf ("Error loading calendar: %s\n", r);
		return 0;
	}
	gnome_calendar_update_all (gcal, NULL, 0);
	return 1;
}

void
gnome_calendar_add_object (GnomeCalendar *gcal, iCalObject *obj)
{
	calendar_add_object (gcal->cal, obj);
	gnome_calendar_update_all (gcal, obj, CHANGE_NEW);
}

void
gnome_calendar_remove_object (GnomeCalendar *gcal, iCalObject *obj)
{
	calendar_remove_object (gcal->cal, obj);
	gnome_calendar_update_all (gcal, obj, CHANGE_ALL);
}

void
gnome_calendar_object_changed (GnomeCalendar *gcal, iCalObject *obj, int flags)
{
	g_return_if_fail (gcal != NULL);
	g_return_if_fail (GNOME_IS_CALENDAR (gcal));
	g_return_if_fail (obj != NULL);

	/* FIXME: for now we only update the views.  Most likely we
	 * need to do something else like set the last_mod field on
	 * the iCalObject and such - Federico
	 */

	gcal->cal->modified = TRUE;

	gnome_calendar_update_all (gcal, obj, flags);
}

static int
max_open_files (void)
{
        static int files;

        if (files)
                return files;

        files = sysconf (_SC_OPEN_MAX);
        if (files != -1)
                return files;
#ifdef OPEN_MAX
        return files = OPEN_MAX;
#else
        return files = 256;
#endif
}

static void
execute (char *command, int close_standard)
{
	struct sigaction ignore, save_intr, save_quit;
	int status = 0, i;
	pid_t pid;
	
	ignore.sa_handler = SIG_IGN;
	sigemptyset (&ignore.sa_mask);
	ignore.sa_flags = 0;
    
	sigaction (SIGINT, &ignore, &save_intr);    
	sigaction (SIGQUIT, &ignore, &save_quit);

	if ((pid = fork ()) < 0){
		fprintf (stderr, "\n\nfork () = -1\n");
		return;
	}
	if (pid == 0){
		pid = fork ();
		if (pid == 0){
			const int top = max_open_files ();
			sigaction (SIGINT,  &save_intr, NULL);
			sigaction (SIGQUIT, &save_quit, NULL);
			
			for (i = (close_standard ? 0 : 3); i < top; i++)
				close (i);
			
			/* FIXME: As an excercise to the reader, copy the
			 * code from mc to setup shell properly instead of
			 * /bin/sh.  Yes, this comment is larger than a cut and paste.
			 */
			execl ("/bin/sh", "/bin/sh", "-c", command, (char *) 0);
			
			exit (127);
		} else {
			exit (127);
		}
	}
	wait (&status);
	sigaction (SIGINT,  &save_intr, NULL);
	sigaction (SIGQUIT, &save_quit, NULL);
}

void
calendar_notify (time_t time, void *data)
{
	iCalObject *ico = data;

	if (ico->aalarm.enabled && ico->aalarm.trigger == time){
		printf ("bip\n");
		return;
	}

        if (ico->palarm.enabled && ico->palarm.trigger == time){
		execute (ico->palarm.data, 0);
		return;
	}

	if (ico->malarm.enabled && ico->malarm.trigger == time){
		char *command;
		time_t app = ico->malarm.trigger + ico->malarm.offset;
		
		command = g_copy_strings ("mail -s '",
					  _("Reminder of your appointment at "),
					  ctime (&app), "' '",
					  ico->malarm.data, "' ",
					  NULL);
		execute (command, 1);
		
		g_free (command);
		return;
	}

	if (ico->dalarm.enabled && ico->dalarm.trigger == time){
		time_t app = ico->dalarm.trigger + ico->dalarm.offset;
		GtkWidget *w;
		char *msg;

		msg = g_copy_strings (_("Reminder of your appointment at "),
					ctime (&app), "`",
					ico->summary, "'", NULL);
		w = gnome_message_box_new (msg, GNOME_MESSAGE_BOX_INFO, "Ok", NULL);
		gtk_widget_show (w);
		return;
	}
}