path: root/my-evolution/e-summary-calendar.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-summary-calendar.c
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * 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.
 *
 * Author: Iain Holmes  <iain@ximian.com>
 */

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

#include <gnome.h>
#include <gal/widgets/e-unicode.h>

#include "e-summary-calendar.h"
#include "e-summary.h"
#include <cal-client/cal-client.h>
#include <cal-util/timeutil.h>

#include <bonobo/bonobo-exception.h>
#include <bonobo/bonobo-moniker-util.h>
#include <bonobo-conf/bonobo-config-database.h>

#include <liboaf/liboaf.h>

#include <ical.h>

struct _ESummaryCalendar {
    CalClient *client;

    char *html;
    gboolean wants24hr;
};

const char *
e_summary_calendar_get_html (ESummary *summary)
{
    if (summary->calendar == NULL) {
        return NULL;
    }

    return summary->calendar->html;
}

typedef struct {
    char *uid;
    CalComponent *comp;
    CalComponentDateTime dt;
    icaltimezone *zone;
} ESummaryCalEvent;

/* Returns TRUE if the TZIDs are equivalent, i.e. both NULL or the same. */
static gboolean
cal_component_compare_tzid (const char *tzid1, const char *tzid2)
{
        gboolean retval = TRUE;

        if (tzid1) {
                if (!tzid2 || strcmp (tzid1, tzid2))
                        retval = FALSE;
        } else {
                if (tzid2)
                        retval = FALSE;
        }

        return retval;
}

gboolean
e_cal_comp_util_compare_event_timezones (CalComponent *comp,
                     CalClient *client,
                     icaltimezone *zone)
{
        CalClientGetStatus status;
        CalComponentDateTime start_datetime, end_datetime;
        const char *tzid;
        gboolean retval = FALSE;
        icaltimezone *start_zone, *end_zone;
        int offset1, offset2;

        tzid = icaltimezone_get_tzid (zone);

        cal_component_get_dtstart (comp, &start_datetime);
        cal_component_get_dtend (comp, &end_datetime);

        /* FIXME: DURATION may be used instead. */
        if (cal_component_compare_tzid (tzid, start_datetime.tzid)
            && cal_component_compare_tzid (tzid, end_datetime.tzid)) {
                /* If both TZIDs are the same as the given zone's TZID, then
                   we know the timezones are the same so we return TRUE. */
                retval = TRUE;
        } else {
                /* If the TZIDs differ, we have to compare the UTC offsets
                   of the start and end times, using their own timezones and
                   the given timezone. */
                status = cal_client_get_timezone (client,
                                                  start_datetime.tzid,
                                                  &start_zone);
                if (status != CAL_CLIENT_GET_SUCCESS)
                        goto out;

                offset1 = icaltimezone_get_utc_offset (start_zone,
                                                       start_datetime.value,
                                                       NULL);
                offset2 = icaltimezone_get_utc_offset (zone,
                                                       start_datetime.value,
                                                       NULL);
                if (offset1 == offset2) {
                        status = cal_client_get_timezone (client,
                                                          end_datetime.tzid,
                                                          &end_zone);
                        if (status != CAL_CLIENT_GET_SUCCESS)
                                goto out;

                        offset1 = icaltimezone_get_utc_offset (end_zone,
                                                               end_datetime.value,
                                                               NULL);
                        offset2 = icaltimezone_get_utc_offset (zone,
                                                               end_datetime.value,
                                                               NULL);
                        if (offset1 == offset2)
                                retval = TRUE;
                }
        }

 out:

        cal_component_free_datetime (&start_datetime);
        cal_component_free_datetime (&end_datetime);

        return retval;
}

static int
e_summary_calendar_event_sort_func (const void *e1,
                    const void *e2)
{
    ESummaryCalEvent *event1, *event2;

    event1 = *(ESummaryCalEvent **) e1;
    event2 = *(ESummaryCalEvent **) e2;

    if (event1->dt.value == NULL || event2->dt.value == NULL) {
        return 0;
    }

    return icaltime_compare (*(event1->dt.value), *(event2->dt.value));
}

struct _RecurData {
    ESummary *summary;
    GPtrArray *array;
    ESummaryCalEvent *event;
};

static gboolean
add_recurrances (CalComponent *comp,
         time_t start,
         time_t end,
         gpointer data)
{
    struct _RecurData *recur = data;
    struct icaltimetype v, *p;
    ESummaryCalEvent *event;

    event = g_new (ESummaryCalEvent, 1);
    v = icaltime_from_timet_with_zone (start, FALSE, recur->summary->tz);
    p = g_new (struct icaltimetype, 1);

    event->dt.value = p;

    p->year = v.year;
    p->month = v.month;
    p->day = v.day;
    p->hour = v.hour;
    p->minute = v.minute;
    p->second = v.second;
    p->is_utc = v.is_utc;
    p->is_date = v.is_date;
    p->is_daylight = v.is_daylight;
    p->zone = v.zone;
    
    event->dt.tzid = recur->summary->timezone;
    event->comp = comp;
    event->uid = g_strdup (recur->event->uid);
    event->zone = recur->summary->tz;

    gtk_object_ref (GTK_OBJECT (comp));

    g_ptr_array_add (recur->array, event);
    return TRUE;
}

static GPtrArray *
uids_to_array (ESummary *summary,
           CalClient *client,
           GList *uids,
           time_t begin,
           time_t end)
{
    GList *p;
    GPtrArray *array;

    g_return_val_if_fail (IS_E_SUMMARY (summary), NULL);
    g_return_val_if_fail (client != NULL, NULL);
    g_return_val_if_fail (uids != NULL, NULL);

    array = g_ptr_array_new ();
    for (p = uids; p; p = p->next) {
        ESummaryCalEvent *event;
        CalClientGetStatus status;

        event = g_new (ESummaryCalEvent, 1);

        event->uid = g_strdup (p->data);
        status = cal_client_get_object (client, p->data, &event->comp);
        if (status != CAL_CLIENT_GET_SUCCESS) {
            g_free (event);
            continue;
        }

        if (cal_component_has_recurrences (event->comp) == TRUE) {
            struct _RecurData *recur;

            recur = g_new (struct _RecurData, 1);
            recur->event = event;
            recur->array = array;
            recur->summary = summary;
            cal_recur_generate_instances (event->comp, begin, end,
                              add_recurrances, recur,
                              cal_client_resolve_tzid_cb, client);
            g_free (recur);
            g_free (event->uid);
            g_free (event);
        } else {
            cal_component_get_dtstart (event->comp, &event->dt);
            
            status = cal_client_get_timezone (client, event->dt.tzid, &event->zone);
            if (status != CAL_CLIENT_GET_SUCCESS) {
                gtk_object_unref (GTK_OBJECT (event->comp));
                g_free (event);
                continue;
            }
            
            icaltimezone_convert_time (event->dt.value, event->zone, summary->tz);
            g_ptr_array_add (array, event);
        }
    }

    qsort (array->pdata, array->len, sizeof (ESummaryCalEvent *), e_summary_calendar_event_sort_func);

    return array;
}

static void
free_event_array (GPtrArray *array)
{
    int i;

    for (i = 0; i < array->len; i++) {
        ESummaryCalEvent *event;
        
        event = array->pdata[i];
        g_free (event->uid);
        gtk_object_unref (GTK_OBJECT (event->comp));
    }

    g_ptr_array_free (array, TRUE);
}

static gboolean
generate_html (gpointer data)
{
    ESummary *summary = data;
    ESummaryCalendar *calendar = summary->calendar;
    GList *uids;
    GString *string;
    char *tmp;
    time_t t, begin, end, f;

    t = time (NULL);
    begin = time_day_begin_with_zone (t, summary->tz);
    switch (summary->preferences->days) {
    case E_SUMMARY_CALENDAR_ONE_DAY:
        end = time_day_end_with_zone (t, summary->tz);
        break;

    case E_SUMMARY_CALENDAR_FIVE_DAYS:
        f = time_add_day (t, 5);
        end = time_day_end_with_zone (f, summary->tz);
        break;
    
    case E_SUMMARY_CALENDAR_ONE_WEEK:
        f = time_add_week (t, 1);
        end = time_day_end_with_zone (f, summary->tz);
        break;

    case E_SUMMARY_CALENDAR_ONE_MONTH:
    default:
        f = time_add_month (t, 1);
        end = time_day_end_with_zone (f, summary->tz);
        break;
    }

    uids = cal_client_get_objects_in_range (calendar->client, 
                        CALOBJ_TYPE_EVENT, begin, end);
    if (uids == NULL) {
        char *s1, *s2;

        s1 = e_utf8_from_locale_string (_("Appointments"));
        s2 = e_utf8_from_locale_string (_("No appointments"));
        g_free (calendar->html);
        calendar->html = g_strconcat ("<dl><dt><img src=\"myevo-appointments.png\" align=\"middle\" "
                                      "alt=\"\" width=\"48\" height=\"48\"> <b><a href=\"evolution:/local/Calendar\">",
                                      s1, "</a></b></dt><dd><b>", s2, "</b></dd></dl>", NULL);
        g_free (s1);
        g_free (s2);

        e_summary_draw (summary);
        return FALSE;
    } else {
        GPtrArray *uidarray;
        int i;
        char *s;

        string = g_string_new ("<dl><dt><img src=\"myevo-appointments.png\" align=\"middle\" "
                               "alt=\"\" width=\"48\" height=\"48\"> <b><a href=\"evolution:/local/Calendar\">");
        s = e_utf8_from_locale_string (_("Appointments"));
        g_string_append (string, s);
        g_free (s);
        g_string_append (string, "</a></b></dt><dd>");

        uidarray = uids_to_array (summary, calendar->client, uids, begin, end);
        for (i = 0; i < uidarray->len; i++) {
            ESummaryCalEvent *event;
            CalComponentText text;
            time_t start_t;
            struct tm *start_tm;
            char *start_str, *img;

            event = uidarray->pdata[i];
            cal_component_get_summary (event->comp, &text);
            start_t = icaltime_as_timet (*event->dt.value);

            start_str = g_new (char, 20);
            start_tm = localtime (&start_t);
            if (calendar->wants24hr == TRUE) {
                strftime (start_str, 19, _("%k%M %d %B"), start_tm);
            } else {
                strftime (start_str, 19, _("%l:%M %d %B"), start_tm);
            }

            if (cal_component_has_alarms (event->comp)) {
                img = "es-appointments.png";
            } else if (e_cal_comp_util_compare_event_timezones (event->comp,
                                        calendar->client,
                                        summary->tz) == FALSE) {
                img = "timezone-16.xpm";
            } else {
                img = "new_appointment.xpm";
            }

            tmp = g_strdup_printf ("<img align=\"middle\" src=\"%s\" "
                           "alt=\"\" width=\"16\" height=\"16\">  &#160; "
                           "<font size=\"-1\"><a href=\"calendar:/%s\">%s, %s</a></font><br>", 
                           img,
                           event->uid, start_str, text.value);
            g_free (start_str);
            
            g_string_append (string, tmp);
            g_free (tmp);
        }

        free_event_array (uidarray);
        g_string_append (string, "</dd></dl>");
    }

    if (calendar->html) {
        g_free (calendar->html);
    }
    calendar->html = string->str;
    g_string_free (string, FALSE);

    e_summary_draw (summary);
    return FALSE;
}

static void
cal_opened_cb (CalClient *client,
           CalClientOpenStatus status,
           ESummary *summary)
{
    if (status == CAL_CLIENT_OPEN_SUCCESS) {
        g_idle_add (generate_html, summary);
    } else {
        /* Need to work out what to do if there's an error */
    }
}
static void
obj_changed_cb (CalClient *client,
        const char *uid,
        gpointer data)
{
    g_idle_add (generate_html, data);
}

static void
e_summary_calendar_protocol (ESummary *summary,
                 const char *uri,
                 void *closure)
{
    ESummaryCalendar *calendar;
    CORBA_Environment ev;
    const char *comp_uri;
    GNOME_Evolution_Calendar_CompEditorFactory factory;

    calendar = (ESummaryCalendar *) closure;

    comp_uri = cal_client_get_uri (calendar->client);

    /* Get the factory */
    CORBA_exception_init (&ev);
    factory = oaf_activate_from_id ("OAFIID:GNOME_Evolution_Calendar_CompEditorFactory", 0, NULL, &ev);
    if (BONOBO_EX (&ev)) {
        g_message ("%s: Could not activate the component editor factory (%s)", __FUNCTION__,
               CORBA_exception_id (&ev));
        CORBA_exception_free (&ev);
        return;
    }

    GNOME_Evolution_Calendar_CompEditorFactory_editExisting (factory, comp_uri, (char *)uri + 10, &ev);

    if (BONOBO_EX (&ev)) {
        g_message ("%s: Execption while editing the component (%s)", __FUNCTION__, 
               CORBA_exception_id (&ev));
    }

    CORBA_exception_free (&ev);
    bonobo_object_release_unref (factory, NULL);
}

static gboolean
locale_uses_24h_time_format (void)
{
    char s[16];
    time_t t = 0;

    strftime (s, sizeof s, "%p", gmtime (&t));
    return s[0] == '\0';
}

void
e_summary_calendar_init (ESummary *summary)
{
    Bonobo_ConfigDatabase db;
    CORBA_Environment ev;
    ESummaryCalendar *calendar;
    gboolean result;
    char *uri;

    g_return_if_fail (summary != NULL);

    calendar = g_new (ESummaryCalendar, 1);
    summary->calendar = calendar;
    calendar->html = NULL;

    calendar->client = cal_client_new ();
    if (calendar->client == NULL) {
        g_warning ("Error making the client");
        return;
    }

    gtk_signal_connect (GTK_OBJECT (calendar->client), "cal-opened",
                GTK_SIGNAL_FUNC (cal_opened_cb), summary);
    gtk_signal_connect (GTK_OBJECT (calendar->client), "obj-updated",
                GTK_SIGNAL_FUNC (obj_changed_cb), summary);
    gtk_signal_connect (GTK_OBJECT (calendar->client), "obj-removed",
                GTK_SIGNAL_FUNC (obj_changed_cb), summary);

    uri = gnome_util_prepend_user_home ("evolution/local/Calendar/calendar.ics");
    result = cal_client_open_calendar (calendar->client, uri, FALSE);
    g_free (uri);
    if (result == FALSE) {
        g_message ("Open calendar failed");
    }
    
    e_summary_add_protocol_listener (summary, "calendar", e_summary_calendar_protocol, calendar);
    
    CORBA_exception_init (&ev);
    db = bonobo_get_object ("wombat:", "Bonobo/ConfigDatabase", &ev);
    if (BONOBO_EX (&ev) || db == CORBA_OBJECT_NIL) {
        CORBA_exception_free (&ev);
        g_warning ("Error getting Wombat. Using defaults");
        return;
    }

    calendar->wants24hr = bonobo_config_get_boolean_with_default (db, "/Calendar/Display/Use24HourFormat", locale_uses_24h_time_format (), NULL);
    bonobo_object_release_unref (db, NULL);
    CORBA_exception_free (&ev);
}

void
e_summary_calendar_reconfigure (ESummary *summary)
{
    generate_html (summary);
}

void
e_summary_calendar_free (ESummary *summary)
{
    ESummaryCalendar *calendar;

    g_return_if_fail (summary != NULL);
    g_return_if_fail (IS_E_SUMMARY (summary));

    calendar = summary->calendar;
    gtk_object_unref (GTK_OBJECT (calendar->client));
    g_free (calendar->html);

    g_free (calendar);
    summary->calendar = NULL;
}