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, 2002, 2003 Ximian, Inc.
 *
 * 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., 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 <gconf/gconf-client.h>

#include <ical.h>

#define MAX_RELOAD_TRIES 10

struct _ESummaryCalendar {
    CalClient *client;

    char *html;
    gboolean wants24hr;

    char *default_uri;

    GConfClient *gconf_client;
    int gconf_value_changed_handler_id;

    int cal_open_reload_timeout_id;
    int reload_count;
};

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;
}

static gboolean
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);

    /* If either the DTSTART or the DTEND is a DATE value, we return TRUE.
       Maybe if one was a DATE-TIME we should check that, but that should
       not happen often. */
    if ((start_datetime.value && start_datetime.value->is_date)
        || (end_datetime.value && end_datetime.value->is_date)) {
        retval = TRUE;
        goto out;
    }

    /* If the event uses UTC for DTSTART & DTEND, return TRUE. Outlook
       will send single events as UTC, so we don't want to mark all of
       these. */
    if ((!start_datetime.value || start_datetime.value->is_utc)
        && (!end_datetime.value || end_datetime.value->is_utc)) {
        retval = TRUE;
        goto out;
    }

    /* If the event uses floating time for DTSTART & DTEND, return TRUE.
       Imported vCalendar files will use floating times, so we don't want
       to mark all of these. */
    if (!start_datetime.tzid && !end_datetime.tzid) {
        retval = TRUE;
        goto out;
    }

    /* 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;

        if (start_datetime.value) {
            offset1 = icaltimezone_get_utc_offset (start_zone,
                                   start_datetime.value,
                                   NULL);
            offset2 = icaltimezone_get_utc_offset (zone,
                                   start_datetime.value,
                                   NULL);
            if (offset1 != offset2)
                goto out;
        }

        status = cal_client_get_timezone (client,
                          end_datetime.tzid,
                          &end_zone);
        if (status != CAL_CLIENT_GET_SUCCESS)
            goto out;

        if (end_datetime.value) {
            offset1 = icaltimezone_get_utc_offset (end_zone,
                                   end_datetime.value,
                                   NULL);
            offset2 = icaltimezone_get_utc_offset (zone,
                                   end_datetime.value,
                                   NULL);
            if (offset1 != offset2)
                goto out;
        }

        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;

    g_object_ref (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,
                              recur->summary->tz);
            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) {
                g_object_unref (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);
        g_object_unref (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;

    if (cal_client_get_load_state (calendar->client) != CAL_CLIENT_LOAD_LOADED)
        return FALSE;

    /* Set the default timezone on the server. */
    if (summary->tz) {
        cal_client_set_default_timezone (calendar->client,
                         summary->tz);
    }

    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_with_zone (t, 5, summary->tz);
        end = time_day_end_with_zone (f, summary->tz);
        break;
    
    case E_SUMMARY_CALENDAR_ONE_WEEK:
        f = time_add_week_with_zone (t, 1, summary->tz);
        end = time_day_end_with_zone (f, summary->tz);
        break;

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

    uids = cal_client_get_objects_in_range (calendar->client, 
                        CALOBJ_TYPE_EVENT, begin, end);
    string = g_string_new ("<dl><dt><img src=\"myevo-appointments.png\" align=\"middle\" "
                   "alt=\"\" width=\"48\" height=\"48\"> <b>");

    if (calendar->default_uri != NULL)
        g_string_append_printf (string, "<a href=\"%s\">", calendar->default_uri);

    g_string_append (string, _("Appointments"));

    if (calendar->default_uri != NULL)
        g_string_append (string, "</a>");

    g_string_append (string, "</b></dt><dd>");

    if (uids == NULL) {
        g_string_append (string, _("No appointments."));
    } else { 
        GPtrArray *uidarray;
        int i;

        uidarray = uids_to_array (summary, calendar->client, uids, begin, end);
        for (i = 0; i < uidarray->len; i++) {
            ESummaryCalEvent *event;
            CalComponentText text;
            struct tm start_tm;
            char start_str[64], *start_str_utf, *img;

            event = uidarray->pdata[i];
            cal_component_get_summary (event->comp, &text);

            start_tm = icaltimetype_to_tm (event->dt.value);
            if (calendar->wants24hr == TRUE) {
                strftime (start_str, sizeof start_str, _("%k:%M %d %B"), &start_tm);
            } else {
                strftime (start_str, sizeof start_str, _("%l:%M%P %d %B"), &start_tm);
            }

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

            start_str_utf = e_utf8_from_locale_string (start_str);
            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_utf, text.value ? text.value : _("No description"));
            g_free (start_str_utf);
            
            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 gboolean
cal_open_reload_timeout (void *data)
{
    ESummary *summary = (ESummary *) data;

    summary->calendar->cal_open_reload_timeout_id = 0;

    if (++ summary->calendar->reload_count >= MAX_RELOAD_TRIES) {
        summary->calendar->reload_count = 0;
        return FALSE;
    }

    cal_client_open_default_calendar (summary->calendar->client, FALSE);
    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 {
        summary->calendar->cal_open_reload_timeout_id = g_timeout_add (1000,
                                           cal_open_reload_timeout,
                                           summary);
    }
}

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 = bonobo_activation_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)",
               G_GNUC_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)", G_GNUC_FUNCTION, 
               CORBA_exception_id (&ev));
    }

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

static void
setup_calendar (ESummary *summary)
{
    ESummaryCalendar *calendar;

    calendar = summary->calendar;
    g_assert (calendar != NULL);

    if (calendar->cal_open_reload_timeout_id != 0) {
        g_source_remove (calendar->cal_open_reload_timeout_id);
        calendar->cal_open_reload_timeout_id = 0;
        calendar->reload_count = 0;
    }

    if (calendar->client != NULL)
        g_object_unref (calendar->client);

    calendar->client = cal_client_new ();

    g_signal_connect (calendar->client, "cal-opened", G_CALLBACK (cal_opened_cb), summary);
    g_signal_connect (calendar->client, "obj-updated", G_CALLBACK (obj_changed_cb), summary);
    g_signal_connect (calendar->client, "obj-removed", G_CALLBACK (obj_changed_cb), summary);

    if (! cal_client_open_default_calendar (calendar->client, FALSE))
        g_message ("Open calendar failed");

    calendar->wants24hr = gconf_client_get_bool (calendar->gconf_client,
                             "/apps/evolution/calendar/display/use_24h_format", NULL);
    calendar->default_uri = gconf_client_get_string (calendar->gconf_client,
                             "/apps/evolution/shell/default_folders/calendar_path",
                             NULL);
}

static void
gconf_client_value_changed_cb (GConfClient *client,
                   const char *key,
                   GConfValue *value,
                   void *user_data)
{
    setup_calendar (E_SUMMARY (user_data));
    generate_html (user_data);
}

static void
setup_gconf_client (ESummary *summary)
{
    ESummaryCalendar *calendar;

    calendar = summary->calendar;
    g_assert (calendar != NULL);

    calendar->gconf_client = gconf_client_get_default ();

    calendar->gconf_value_changed_handler_id
        = g_signal_connect (calendar->gconf_client, "value_changed",
                    G_CALLBACK (gconf_client_value_changed_cb), summary);

    gconf_client_add_dir (calendar->gconf_client, "/apps/evolution/calendar", FALSE, NULL);
    gconf_client_add_dir (calendar->gconf_client, "/apps/evolution/shell/default_folders", FALSE, NULL);

    setup_calendar (summary);
}

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

    g_return_if_fail (summary != NULL);

    calendar = g_new0 (ESummaryCalendar, 1);
    summary->calendar = calendar;
    calendar->html = NULL;

    setup_gconf_client (summary);
    setup_calendar (summary);

    e_summary_add_protocol_listener (summary, "calendar", e_summary_calendar_protocol, calendar);
}

void
e_summary_calendar_reconfigure (ESummary *summary)
{
    setup_calendar (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;

    if (calendar->cal_open_reload_timeout_id != 0)
        g_source_remove (calendar->cal_open_reload_timeout_id);

    g_object_unref (calendar->client);
    g_free (calendar->html);
    g_free (calendar->default_uri);

    if (calendar->gconf_value_changed_handler_id != 0)
        g_signal_handler_disconnect (calendar->gconf_client,
                         calendar->gconf_value_changed_handler_id);
    g_object_unref (calendar->gconf_client);

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