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/* Evolution calendar client interface object
 *
 * Copyright (C) 2000 Ximian, Inc.
 * Copyright (C) 2000 Ximian, Inc.
 *
 * Authors: Federico Mena-Quintero <federico@ximian.com>
 *          Rodrigo Moya <rodrigo@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.
 */

#include <config.h>
#include <ical.h>
#include "cal.h"
#include "query.h"
#include "wombat.h"

#define PARENT_TYPE         BONOBO_X_OBJECT_TYPE

static BonoboXObjectClass *parent_class;

/* Private part of the Cal structure */
struct _CalPrivate {
    /* Our backend */
    CalBackend *backend;

    /* Listener on the client we notify */
    GNOME_Evolution_Calendar_Listener listener;

    /* and a reference to the WombatClient interface */
    GNOME_Evolution_WombatClient wombat_client;
};


/* Cal::get_uri method */
static CORBA_char *
impl_Cal_get_uri (PortableServer_Servant servant,
         CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    GnomeVFSURI *uri;
    char *str_uri;
    CORBA_char *str_uri_copy;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    uri = cal_backend_get_uri (priv->backend);
    str_uri = gnome_vfs_uri_to_string (uri, GNOME_VFS_URI_HIDE_NONE);
    str_uri_copy = CORBA_string_dup (str_uri);
    g_free (str_uri);

    return str_uri_copy;
}

/* Converts a calendar object type from its CORBA representation to our own
 * representation.
 */
static CalObjType
uncorba_obj_type (GNOME_Evolution_Calendar_CalObjType type)
{
    return (((type & GNOME_Evolution_Calendar_TYPE_EVENT) ? CALOBJ_TYPE_EVENT : 0)
        | ((type & GNOME_Evolution_Calendar_TYPE_TODO) ? CALOBJ_TYPE_TODO : 0)
        | ((type & GNOME_Evolution_Calendar_TYPE_JOURNAL) ? CALOBJ_TYPE_JOURNAL : 0));
}

/* Cal::get_n_objects method */
static CORBA_long
impl_Cal_get_n_objects (PortableServer_Servant servant,
            GNOME_Evolution_Calendar_CalObjType type,
            CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    int t;
    int n;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    t = uncorba_obj_type (type);
    n = cal_backend_get_n_objects (priv->backend, t);
    return n;
}

/* Cal::get_object method */
static GNOME_Evolution_Calendar_CalObj
impl_Cal_get_object (PortableServer_Servant servant,
             const GNOME_Evolution_Calendar_CalObjUID uid,
             CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    char *calobj;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    calobj = cal_backend_get_object (priv->backend, uid);

    if (calobj) {
        CORBA_char *calobj_copy;

        calobj_copy = CORBA_string_dup (calobj);
        g_free (calobj);
        return calobj_copy;
    } else {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_NotFound,
                     NULL);
        return NULL;
    }
}

static GNOME_Evolution_Calendar_CalObjUIDSeq *
build_uid_seq (GList *uids)
{
    GNOME_Evolution_Calendar_CalObjUIDSeq *seq;
    GList *l;
    int n, i;

    n = g_list_length (uids);

    seq = GNOME_Evolution_Calendar_CalObjUIDSeq__alloc ();
    CORBA_sequence_set_release (seq, TRUE);
    seq->_length = n;
    seq->_buffer = CORBA_sequence_GNOME_Evolution_Calendar_CalObjUID_allocbuf (n);

    /* Fill the sequence */

    for (i = 0, l = uids; l; i++, l = l->next) {
        char *uid;

        uid = l->data;
        seq->_buffer[i] = CORBA_string_dup (uid);
    }

    return seq;
}

/* Cal::get_uids method */
static GNOME_Evolution_Calendar_CalObjUIDSeq *
impl_Cal_get_uids (PortableServer_Servant servant,
           GNOME_Evolution_Calendar_CalObjType type,
           CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    GList *uids;
    GNOME_Evolution_Calendar_CalObjUIDSeq *seq;
    int t;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    t = uncorba_obj_type (type);

    uids = cal_backend_get_uids (priv->backend, t);
    seq = build_uid_seq (uids);

    cal_obj_uid_list_free (uids);

    return seq;
}

/* Cal::get_changes method */
static GNOME_Evolution_Calendar_CalObjChangeSeq *
impl_Cal_get_changes (PortableServer_Servant servant,
              GNOME_Evolution_Calendar_CalObjType type,
              const CORBA_char *change_id,
              CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    int t;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    t = uncorba_obj_type (type);
    
    return cal_backend_get_changes (priv->backend, t, change_id);
}

/* Cal::get_objects_in_range method */
static GNOME_Evolution_Calendar_CalObjUIDSeq *
impl_Cal_get_objects_in_range (PortableServer_Servant servant,
                   GNOME_Evolution_Calendar_CalObjType type,
                   GNOME_Evolution_Calendar_Time_t start,
                   GNOME_Evolution_Calendar_Time_t end,
                   CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    int t;
    time_t t_start, t_end;
    GNOME_Evolution_Calendar_CalObjUIDSeq *seq;
    GList *uids;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    t = uncorba_obj_type (type);
    t_start = (time_t) start;
    t_end = (time_t) end;

    if (t_start > t_end || t_start == -1 || t_end == -1) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_InvalidRange,
                     NULL);
        return NULL;
    }

    uids = cal_backend_get_objects_in_range (priv->backend, t, t_start, t_end);
    seq = build_uid_seq (uids);

    cal_obj_uid_list_free (uids);

    return seq;
}

/* Cal::get_free_busy method */
static GNOME_Evolution_Calendar_CalObj
impl_Cal_get_free_busy (PortableServer_Servant servant,
            GNOME_Evolution_Calendar_Time_t start,
            GNOME_Evolution_Calendar_Time_t end,
            CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    time_t t_start, t_end;
    char *calobj;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    t_start = (time_t) start;
    t_end = (time_t) end;

    if (t_start > t_end || t_start == -1 || t_end == -1) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_InvalidRange,
                     NULL);
        return NULL;
    }

    calobj = cal_backend_get_free_busy (priv->backend, t_start, t_end);
        if (calobj) {
        CORBA_char *calobj_copy;

        calobj_copy = CORBA_string_dup (calobj);
        g_free (calobj);
        return calobj_copy;
    }

    CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                 ex_GNOME_Evolution_Calendar_Cal_NotFound,
                 NULL);

    return NULL;
}

/* Cal::get_alarms_in_range method */
static GNOME_Evolution_Calendar_CalComponentAlarmsSeq *
impl_Cal_get_alarms_in_range (PortableServer_Servant servant,
                  GNOME_Evolution_Calendar_Time_t start,
                  GNOME_Evolution_Calendar_Time_t end,
                  CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    time_t t_start, t_end;
    gboolean valid_range;
    GNOME_Evolution_Calendar_CalComponentAlarmsSeq *seq;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    t_start = (time_t) start;
    t_end = (time_t) end;

    seq = cal_backend_get_alarms_in_range (priv->backend, t_start, t_end, &valid_range);
    if (!valid_range) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_InvalidRange,
                     NULL);
        return NULL;
    }

    return seq;
}

/* Cal::get_alarms_for_object method */
static GNOME_Evolution_Calendar_CalComponentAlarms *
impl_Cal_get_alarms_for_object (PortableServer_Servant servant,
                const GNOME_Evolution_Calendar_CalObjUID uid,
                GNOME_Evolution_Calendar_Time_t start,
                GNOME_Evolution_Calendar_Time_t end,
                CORBA_Environment * ev)
{
    Cal *cal;
    CalPrivate *priv;
    time_t t_start, t_end;
    GNOME_Evolution_Calendar_CalComponentAlarms *alarms;
    CalBackendGetAlarmsForObjectResult result;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    t_start = (time_t) start;
    t_end = (time_t) end;

    alarms = cal_backend_get_alarms_for_object (priv->backend, uid, t_start, t_end, &result);

    switch (result) {
    case CAL_BACKEND_GET_ALARMS_SUCCESS:
        return alarms;

    case CAL_BACKEND_GET_ALARMS_NOT_FOUND:
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_NotFound,
                     NULL);
        return NULL;

    case CAL_BACKEND_GET_ALARMS_INVALID_RANGE:
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_InvalidRange,
                     NULL);
        return NULL;

    default:
        g_assert_not_reached ();
        return NULL;
    }
}

/* Cal::update_object method */
static void
impl_Cal_update_object (PortableServer_Servant servant,
            const GNOME_Evolution_Calendar_CalObjUID uid,
            const GNOME_Evolution_Calendar_CalObj calobj,
            CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    if (!cal_backend_update_object (priv->backend, uid, calobj))
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_InvalidObject,
                     NULL);
}

/* Cal::remove_object method */
static void
impl_Cal_remove_object (PortableServer_Servant servant,
            const GNOME_Evolution_Calendar_CalObjUID uid,
            CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    if (!cal_backend_remove_object (priv->backend, uid))
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_NotFound,
                     NULL);
}

/* Cal::getQuery implementation */
static GNOME_Evolution_Calendar_Query
impl_Cal_get_query (PortableServer_Servant servant,
            const CORBA_char *sexp,
            GNOME_Evolution_Calendar_QueryListener ql,
            CORBA_Environment *ev)
{
    Cal *cal;
    CalPrivate *priv;
    Query *query;
    CORBA_Environment ev2;
    GNOME_Evolution_Calendar_Query query_copy;

    cal = CAL (bonobo_object_from_servant (servant));
    priv = cal->priv;

    query = query_new (priv->backend, ql, sexp);
    if (!query) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_CouldNotCreate,
                     NULL);
        return CORBA_OBJECT_NIL;
    }

    CORBA_exception_init (&ev2);
    query_copy = CORBA_Object_duplicate (BONOBO_OBJREF (query), &ev2);
    if (ev2._major != CORBA_NO_EXCEPTION) {
        CORBA_exception_free (&ev2);
        g_message ("Cal_get_query(): Could not duplicate the query reference");
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Calendar_Cal_CouldNotCreate,
                     NULL);
        return CORBA_OBJECT_NIL;
    }

    CORBA_exception_free (&ev2);

    return query_copy;
}

/**
 * cal_construct:
 * @cal: A calendar client interface.
 * @corba_cal: CORBA object for the calendar.
 * @backend: Calendar backend that this @cal presents an interface to.
 * @listener: Calendar listener for notification.
 *
 * Constructs a calendar client interface object by binding the corresponding
 * CORBA object to it.  The calendar interface is bound to the specified
 * @backend, and will notify the @listener about changes to the calendar.
 *
 * Return value: The same object as the @cal argument.
 **/
Cal *
cal_construct (Cal *cal,
           CalBackend *backend,
           GNOME_Evolution_Calendar_Listener listener)
{
    CalPrivate *priv;
    CORBA_Environment ev;

    g_return_val_if_fail (cal != NULL, NULL);
    g_return_val_if_fail (IS_CAL (cal), NULL);
    g_return_val_if_fail (backend != NULL, NULL);
    g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL);

    priv = cal->priv;

    CORBA_exception_init (&ev);
    priv->listener = CORBA_Object_duplicate (listener, &ev);
    if (ev._major != CORBA_NO_EXCEPTION) {
        g_message ("cal_construct: could not duplicate the listener");
        priv->listener = CORBA_OBJECT_NIL;
        CORBA_exception_free (&ev);
        return NULL;
    }

    /* obtain the WombatClient interface */
    priv->wombat_client = Bonobo_Unknown_queryInterface (
        priv->listener,
        "IDL:GNOME/Evolution/WombatClient:1.0",
        &ev);
    if (ev._major != CORBA_NO_EXCEPTION) {
        g_message ("cal_construct: could not get the WombatClient interface");
        priv->wombat_client = CORBA_OBJECT_NIL;
    }

    CORBA_exception_free (&ev);

    priv->backend = backend;

    return cal;
}

/**
 * cal_new:
 * @backend: A calendar backend.
 * @listener: A calendar listener.
 *
 * Creates a new calendar client interface object and binds it to the specified
 * @backend and @listener objects.
 *
 * Return value: A newly-created #Cal calendar client interface object, or NULL
 * if its corresponding CORBA object could not be created.
 **/
Cal *
cal_new (CalBackend *backend, GNOME_Evolution_Calendar_Listener listener)
{
    Cal *cal, *retval;

    g_return_val_if_fail (backend != NULL, NULL);
    g_return_val_if_fail (IS_CAL_BACKEND (backend), NULL);

    cal = CAL (gtk_type_new (CAL_TYPE));

    retval = cal_construct (cal, backend, listener);
    if (!retval) {
        g_message ("cal_new(): could not construct the calendar client interface");
        bonobo_object_unref (BONOBO_OBJECT (cal));
        return NULL;
    }

    return retval;
}

/* Destroy handler for the calendar */
static void
cal_destroy (GtkObject *object)
{
    Cal *cal;
    CalPrivate *priv;
    CORBA_Environment ev;

    g_return_if_fail (object != NULL);
    g_return_if_fail (IS_CAL (object));

    cal = CAL (object);
    priv = cal->priv;

    priv->backend = NULL;

    CORBA_exception_init (&ev);
    CORBA_Object_release (priv->listener, &ev);
    if (ev._major != CORBA_NO_EXCEPTION)
        g_message ("cal_destroy(): could not release the listener");

    CORBA_exception_free (&ev);

    g_free (priv);

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



/* Class initialization function for the calendar */
static void
cal_class_init (CalClass *klass)
{
    GtkObjectClass *object_class = (GtkObjectClass *) klass;
    POA_GNOME_Evolution_Calendar_Cal__epv *epv = &klass->epv;

    parent_class = gtk_type_class (BONOBO_OBJECT_TYPE);

    /* Class method overrides */
    object_class->destroy = cal_destroy;

    /* Epv methods */
    epv->_get_uri = impl_Cal_get_uri;
    epv->countObjects = impl_Cal_get_n_objects;
    epv->getObject = impl_Cal_get_object;
    epv->getUIDs = impl_Cal_get_uids;
    epv->getChanges = impl_Cal_get_changes;
    epv->getObjectsInRange = impl_Cal_get_objects_in_range;
    epv->getFreeBusy = impl_Cal_get_free_busy;
    epv->getAlarmsInRange = impl_Cal_get_alarms_in_range;
    epv->getAlarmsForObject = impl_Cal_get_alarms_for_object;
    epv->updateObject = impl_Cal_update_object;
    epv->removeObject = impl_Cal_remove_object;
    epv->getQuery = impl_Cal_get_query;
}


/* Object initialization function for the calendar */
static void
cal_init (Cal *cal)
{
    CalPrivate *priv;

    priv = g_new0 (CalPrivate, 1);
    cal->priv = priv;

    priv->listener = CORBA_OBJECT_NIL;
}

BONOBO_X_TYPE_FUNC_FULL (Cal, GNOME_Evolution_Calendar_Cal, PARENT_TYPE, cal);

/**
 * cal_notify_update:
 * @cal: A calendar client interface.
 * @uid: UID of object that was updated.
 * 
 * Notifies a listener attached to a calendar client interface object about an
 * update to a calendar object.
 **/
void
cal_notify_update (Cal *cal, const char *uid)
{
    CalPrivate *priv;
    CORBA_Environment ev;

    g_return_if_fail (cal != NULL);
    g_return_if_fail (IS_CAL (cal));
    g_return_if_fail (uid != NULL);

    priv = cal->priv;
    g_return_if_fail (priv->listener != CORBA_OBJECT_NIL);

    CORBA_exception_init (&ev);
    GNOME_Evolution_Calendar_Listener_notifyObjUpdated (priv->listener, (char *) uid, &ev);

    if (ev._major != CORBA_NO_EXCEPTION)
        g_message ("cal_notify_update(): could not notify the listener "
               "about an updated object");

    CORBA_exception_free (&ev);
}

/**
 * cal_notify_remove:
 * @cal: A calendar client interface.
 * @uid: UID of object that was removed.
 * 
 * Notifies a listener attached to a calendar client interface object about a
 * calendar object that was removed.
 **/
void
cal_notify_remove (Cal *cal, const char *uid)
{
    CalPrivate *priv;
    CORBA_Environment ev;

    g_return_if_fail (cal != NULL);
    g_return_if_fail (IS_CAL (cal));
    g_return_if_fail (uid != NULL);

    priv = cal->priv;
    g_return_if_fail (priv->listener != CORBA_OBJECT_NIL);

    CORBA_exception_init (&ev);
    GNOME_Evolution_Calendar_Listener_notifyObjRemoved (priv->listener, (char *) uid, &ev);

    if (ev._major != CORBA_NO_EXCEPTION)
        g_message ("cal_notify_remove(): could not notify the listener "
               "about a removed object");

    CORBA_exception_free (&ev);
}

/**
 * cal_get_password:
 * @cal: A calendar client interface.
 * @prompt: The message to show to the user when asking for the password.
 * @key: A key associated with the password being asked.
 *
 * Gets a password from the calendar client this Cal knows about. It does
 * so by using the WombatClient interface being used by the corresponding
 * CalClient.
 *
 * Returns: a password entered by the user.
 */
char *
cal_get_password (Cal *cal, const char *prompt, const char *key)
{
    CalPrivate *priv;
    CORBA_Environment ev;
    CORBA_char *pwd;

    g_return_val_if_fail (cal != NULL, NULL);
    g_return_val_if_fail (IS_CAL (cal), NULL);

    priv = cal->priv;
    g_return_val_if_fail (priv->wombat_client != CORBA_OBJECT_NIL, NULL);

    CORBA_exception_init (&ev);
    pwd = GNOME_Evolution_WombatClient_getPassword (
        priv->wombat_client,
        (const CORBA_char *) prompt,
        (const CORBA_char *) key,
        &ev);
    if (ev._major != CORBA_NO_EXCEPTION) {
        g_message ("cal_get_password: could not get password from associated WombatClient");
        CORBA_exception_free (&ev);
        return NULL;
    }

    return pwd;
}

/**
 * cal_forget_password:
 * @cal: A calendar client interface.
 * @key: A key associated with the password to be forgotten.
 *
 * Notifies the associated calendar client that it should forget
 * about the password identified by @key, so that next time the backend
 * asks the client about it, the client would ask again the user for it.
 * This is done in cases where the password supplied the first time
 * was not a valid password and the backend needs the user to enter
 * a new one.
 */
void
cal_forget_password (Cal *cal, const char *key)
{
    CalPrivate *priv;
    CORBA_Environment ev;

    g_return_if_fail (cal != NULL);
    g_return_if_fail (IS_CAL (cal));

    priv = cal->priv;
    g_return_if_fail (priv->wombat_client != CORBA_OBJECT_NIL);

    CORBA_exception_init (&ev);
    GNOME_Evolution_WombatClient_forgetPassword (
        priv->wombat_client,
        (const CORBA_char *) key,
        &ev);

    if (ev._major != CORBA_NO_EXCEPTION) {
        g_message ("cal_forget_password: could not notify WombatClient about "
               "password to be forgotten");
    }

    CORBA_exception_free (&ev);
}