path: root/calendar/conduits/todo/todo-conduit.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Evolution calendar - ToDo Conduit
 *
 * Copyright (C) 1998 Free Software Foundation
 * Copyright (C) 2000 Helix Code, Inc.
 *
 * Authors: Eskil Heyn Olsen <deity@eskil.dk> 
 *          JP Rosevear <jpr@helixcode.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 <sys/stat.h>
#include <utime.h>
#include <unistd.h>
#include <pwd.h>
#include <signal.h>
#include <errno.h>

#include <liboaf/liboaf.h>
#include <bonobo.h>
#include <gnome-xml/parser.h>
#include <cal-client/cal-client.h>
#include <cal-util/timeutil.h>
#include <pi-source.h>
#include <pi-socket.h>
#include <pi-file.h>
#include <pi-dlp.h>
#include <pi-version.h>
#include <todo-conduit-config.h>
#include <todo-conduit.h>
#include <libical/src/libical/icaltypes.h>


GnomePilotConduit * conduit_get_gpilot_conduit (guint32);
void conduit_destroy_gpilot_conduit (GnomePilotConduit*);

#define CONDUIT_VERSION "0.8.11"
#ifdef G_LOG_DOMAIN
#undef G_LOG_DOMAIN
#endif
#define G_LOG_DOMAIN "todoconduit"

#define DEBUG_CALCONDUIT 1
/* #undef DEBUG_CALCONDUIT */

#ifdef DEBUG_CALCONDUIT
#define LOG(e...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, e)
#else
#define LOG(e...)
#endif 

#define WARN(e...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_WARNING, e)
#define INFO(e...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, e)

/* debug spew DELETE ME */
static char *print_local (EToDoLocalRecord *local)
{
    static char buff[ 4096 ];

    if (local == NULL) {
        sprintf (buff, "[NULL]");
        return buff;
    }

    if (local->todo && local->todo->description) {
        sprintf (buff, "[%d %ld %d %d '%s' '%s']",
             local->todo->indefinite,
             mktime (& local->todo->due),
             local->todo->priority,
             local->todo->complete,
             local->todo->description,
             local->todo->note);
        return buff;
    }

    return "";
    
    return cal_component_get_as_string (local->comp);
}


/* debug spew DELETE ME */
static char *print_remote (GnomePilotRecord *remote)
{
    static char buff[ 4096 ];
    struct ToDo todo;

    if (remote == NULL) {
        sprintf (buff, "[NULL]");
        return buff;
    }

    memset (&todo, 0, sizeof (struct ToDo));
    unpack_ToDo (&todo, remote->record, remote->length);

    sprintf (buff, "[%d %ld %d %d '%s' '%s']",
         todo.indefinite,
         mktime (& todo.due),
         todo.priority,
         todo.complete,
         todo.description,
         todo.note);

    return buff;
}

/* Context Routines */
static void
e_todo_context_new (EToDoConduitContext **ctxt, guint32 pilot_id) 
{
    *ctxt = g_new0 (EToDoConduitContext,1);
    g_assert (ctxt!=NULL);

    todoconduit_load_configuration (&(*ctxt)->cfg, pilot_id);
}

static void
e_todo_context_destroy (EToDoConduitContext **ctxt)
{
    g_return_if_fail (ctxt!=NULL);
    g_return_if_fail (*ctxt!=NULL);

    if ((*ctxt)->client != NULL)
        gtk_object_unref (GTK_OBJECT ((*ctxt)->client));

    if ((*ctxt)->cfg != NULL)
        todoconduit_destroy_configuration (&(*ctxt)->cfg);

    g_free (*ctxt);
    *ctxt = NULL;
}

/* Map routines */
static char *
map_name (EToDoConduitContext *ctxt) 
{
    char *filename;
    
    filename = g_strdup_printf ("%s/evolution/local/Calendar/pilot-map-%d.xml", g_get_home_dir (), ctxt->cfg->pilot_id);

    return filename;
}

static void
map_set_node_timet (xmlNodePtr node, const char *name, time_t t)
{
    char *tstring;
    
    tstring = g_strdup_printf ("%ld", t);
    xmlSetProp (node, name, tstring);
}

static void
map_sax_start_element (void *data, const xmlChar *name, 
               const xmlChar **attrs)
{
    EToDoConduitContext *ctxt = (EToDoConduitContext *)data;

    if (!strcmp (name, "PilotMap")) {
        while (attrs && *attrs != NULL) {
            const xmlChar **val = attrs;
            
            val++;
            if (!strcmp (*attrs, "timestamp")) 
                ctxt->since = (time_t)strtoul (*val, NULL, 0);

            attrs = ++val;
        }
    }
     
    if (!strcmp (name, "map")) {
        char *uid = NULL;
        guint32 *pid = g_new (guint32, 1);

        *pid = 0;

        while (attrs && *attrs != NULL) {
            const xmlChar **val = attrs;
            
            val++;
            if (!strcmp (*attrs, "uid")) 
                uid = g_strdup (*val);
            
            if (!strcmp (*attrs, "pilotid"))
                *pid = strtoul (*val, NULL, 0);
                
            attrs = ++val;
        }
            
        if (uid && *pid != 0)
            g_hash_table_insert (ctxt->map, pid, uid);
        else
            g_free (pid);
    }
}

static void
map_write_foreach (gpointer key, gpointer value, gpointer data)
{
    xmlNodePtr root = data;
    xmlNodePtr mnode;
    unsigned long *pid = key;
    const char *uid = value;
    char *pidstr;
    
    mnode = xmlNewChild (root, NULL, "map", NULL);
    xmlSetProp (mnode, "uid", uid);
    pidstr = g_strdup_printf ("%lu", *pid);
    xmlSetProp (mnode, "pilot_id", pidstr);
    g_free (pidstr);
}
        
static int
map_write (EToDoConduitContext *ctxt, char *filename)
{
    xmlDocPtr doc;
    int ret;
    
    if (ctxt->map == NULL)
        return 0;
    
    doc = xmlNewDoc ("1.0");
    if (doc == NULL) {
        WARN ("Pilot map file could not be created\n");
        return -1;
    }
    doc->root = xmlNewDocNode(doc, NULL, "PilotMap", NULL);
    map_set_node_timet (doc->root, "timestamp", time (NULL));

    g_hash_table_foreach (ctxt->map, map_write_foreach, doc->root);
    
    /* Write the file */
    xmlSetDocCompressMode (doc, 0);
    ret = xmlSaveFile (filename, doc);
    if (ret < 0) {
        g_warning ("Pilot map file '%s' could not be saved\n", filename);
        return -1;
    }
    
    xmlFreeDoc (doc);

    return 0;
}

/* Calendar Server routines */
static void
start_calendar_server_cb (GtkWidget *cal_client,
              CalClientLoadStatus status,
              EToDoConduitContext *ctxt)
{
    CalClient *client = CAL_CLIENT (cal_client);

    LOG ("  entering start_calendar_server_load_cb, tried=%d\n",
        ctxt->calendar_load_tried);

    if (status == CAL_CLIENT_LOAD_SUCCESS) {
        ctxt->calendar_load_success = TRUE;
        LOG ("    success\n");
        gtk_main_quit (); /* end the sub event loop */
    } else {
        if (ctxt->calendar_load_tried) {
            LOG ("    load and create of calendar failed\n");
            gtk_main_quit (); /* end the sub event loop */
            return;
        }

        cal_client_create_calendar (client, ctxt->calendar_file);
        ctxt->calendar_load_tried = TRUE;
    }
}

static int
start_calendar_server (EToDoConduitContext *ctxt)
{
    
    g_return_val_if_fail (ctxt != NULL, -2);

    ctxt->client = cal_client_new ();

    /* FIX ME */
    ctxt->calendar_file = g_concat_dir_and_file (g_get_home_dir (),
                   "evolution/local/Calendar/calendar.ics");

    gtk_signal_connect (GTK_OBJECT (ctxt->client), "cal_loaded",
                start_calendar_server_cb, ctxt);

    LOG ("    calling cal_client_load_calendar\n");
    cal_client_load_calendar (ctxt->client, ctxt->calendar_file);

    /* run a sub event loop to turn cal-client's async load
       notification into a synchronous call */
    gtk_main ();

    if (ctxt->calendar_load_success)
        return 0;

    return -1;
}

/* Utility routines */
static const char *
status_to_string (gint status)
{
    switch(status) {
    case GnomePilotRecordNothing: return "GnomePilotRecordNothing";
    case GnomePilotRecordDeleted: return "GnomePilotRecordDeleted";
    case GnomePilotRecordNew: return "GnomePilotRecordNew";
    case GnomePilotRecordModified: return "GnomePilotRecordModified";
    }

    return "Unknown";
}

static void
compute_status (EToDoConduitContext *ctxt, EToDoLocalRecord *local, const char *uid)
{
    local->local.archived = FALSE;
    local->local.secret = FALSE;
    
    if (g_hash_table_lookup (ctxt->added, uid))
        local->local.attr = GnomePilotRecordNew;
    else if (g_hash_table_lookup (ctxt->modified, uid))
        local->local.attr = GnomePilotRecordModified;
    else if (g_hash_table_lookup (ctxt->deleted, uid))
        local->local.attr = GnomePilotRecordNew;
    else
        local->local.attr = GnomePilotRecordDeleted;
}

static GnomePilotRecord *
local_record_to_pilot_record (EToDoLocalRecord *local,
                  EToDoConduitContext *ctxt)
{
    GnomePilotRecord *p = NULL;
    
    g_return_val_if_fail (local != NULL, NULL);
    g_assert (local->comp != NULL);
    g_assert (local->todo != NULL );
    
    LOG ("local_record_to_remote_record\n");

    p = g_new0 (GnomePilotRecord, 1);

    p->ID = local->local.ID;
    p->category = 0;
    p->attr = local->local.attr;
    p->archived = local->local.archived;
    p->secret = local->local.secret;

    /* Generate pilot record structure */
    p->record = g_new0 (char,0xffff);
    p->length = pack_ToDo (local->todo, p->record, 0xffff);

    return p;   
}

/*
 * converts a CalComponent object to a EToDoLocalRecord
 */
static void
local_record_from_comp (EToDoLocalRecord *local, CalComponent *comp) 
{
    int *priority;
    struct icaltimetype *completed;
    CalComponentText summary;
    GSList *d_list = NULL;
    CalComponentText *description;
    CalComponentDateTime due;
    time_t due_time;
    CalComponentClassification classif;
    unsigned long *pilot_id;
    unsigned long *pilot_status;

    LOG ("local_record_from_comp\n");

    g_return_if_fail (local != NULL);
    g_return_if_fail (comp != NULL);

    local->comp = comp;

    local->todo = g_new0 (struct ToDo,1);

    /* STOP: don't replace these with g_strdup, since free_ToDo
       uses free to deallocate */
    cal_component_get_summary (comp, &summary);
    if (summary.value) 
        local->todo->description = strdup ((char *) summary.value);

    cal_component_get_description_list (comp, &d_list);
    if (d_list) {
        description = (CalComponentText *) d_list->data;
        if (description && description->value)
            local->todo->note = strdup (description->value);
        else
            local->todo->note = NULL;
    } else {
        local->todo->note = NULL;
    }

    cal_component_get_due (comp, &due); 
    if (due.value) {
        due_time = icaltime_as_timet (*due.value);
        
        local->todo->due = *localtime (&due_time);
        local->todo->indefinite = 0;
    } else {
        local->todo->indefinite = 1;
    }

    cal_component_get_completed (comp, &completed);
    if (completed) {
        local->todo->complete = 1;
        cal_component_free_icaltimetype (completed);
    }   

    cal_component_get_priority (comp, &priority);
    if (priority) {
        local->todo->priority = *priority;
        cal_component_free_priority (priority);
    }
    
    cal_component_get_pilot_id (comp, &pilot_id);
    cal_component_get_pilot_status (comp, &pilot_status);

    /* Records without a pilot_id are new */
    if (!pilot_id) {
        local->local.attr = GnomePilotRecordNew;
    } else {
        local->local.ID = *pilot_id;
        local->local.attr = *pilot_status;
    }

    cal_component_get_classification (comp, &classif);

    if (classif == CAL_COMPONENT_CLASS_PRIVATE)
        local->local.secret = 1;
    else
        local->local.secret = 0;

    local->local.archived = 0;  
}

static void 
local_record_from_uid (EToDoLocalRecord *local,
               char *uid,
               EToDoConduitContext *ctxt)
{
    CalComponent *comp;
    CalClientGetStatus status;

    g_assert(local!=NULL);

    status = cal_client_get_object (ctxt->client, uid, &comp);

    if (status == CAL_CLIENT_GET_SUCCESS) {
        local_record_from_comp (local, comp);
        compute_status (ctxt, local, uid);
    } else {
        INFO ("Object did not exist");
    }   
}


static CalComponent *
comp_from_remote_record (GnomePilotConduitSyncAbs *conduit,
             GnomePilotRecord *remote,
             CalComponent *in_comp)
{
    CalComponent *comp;
    struct ToDo todo;
    struct icaltimetype now = icaltime_from_timet (time (NULL), FALSE, FALSE);
    unsigned long pilot_status = GnomePilotRecordNothing;
    CalComponentText summary = {NULL, NULL};
    CalComponentText description = {NULL, NULL};
    CalComponentDateTime dt = {NULL, NULL};
    struct icaltimetype due;
    GSList *d_list;

    g_return_val_if_fail (remote != NULL, NULL);

    memset (&todo, 0, sizeof (struct ToDo));
    unpack_ToDo (&todo, remote->record, remote->length);

    if (in_comp == NULL) {
        comp = cal_component_new ();
        cal_component_set_new_vtype (comp, CAL_COMPONENT_TODO);
        cal_component_set_created (comp, &now);
    } else {
        comp = cal_component_clone (in_comp);
    }

    LOG ("        comp_from_remote_record: "
         "merging remote %s into local %s\n", 
         print_remote (remote), cal_component_get_as_string (comp));

    cal_component_set_last_modified (comp, &now);

    summary.value = todo.description;
    cal_component_set_summary (comp, &summary);

    description.value = todo.note;
    d_list = g_slist_append (NULL, &description);
    cal_component_set_comment_list (comp, d_list);
    g_slist_free (d_list);

    if (todo.complete) {
        int percent = 100;
        cal_component_set_completed (comp, &now);
        cal_component_set_percent (comp, &percent);
    }

    /* FIX ME This is a bit hackish, how else can we tell if there is
     * no due date set?
     */
    if (todo.due.tm_sec || todo.due.tm_min || todo.due.tm_hour 
        || todo.due.tm_mday || todo.due.tm_mon || todo.due.tm_year) {
        due = icaltime_from_timet (mktime (&todo.due), FALSE, FALSE);
        dt.value = &due;
        cal_component_set_due (comp, &dt);
    }
    
    cal_component_set_priority (comp, &todo.priority);
    cal_component_set_transparency (comp, CAL_COMPONENT_TRANSP_NONE);

    if (remote->attr & dlpRecAttrSecret)
        cal_component_set_classification (comp, CAL_COMPONENT_CLASS_PRIVATE);
    else
        cal_component_set_classification (comp, CAL_COMPONENT_CLASS_PUBLIC);

    cal_component_commit_sequence (comp);
    
    free_ToDo(&todo);

    return comp;
}

static void
update_comp (GnomePilotConduitSyncAbs *conduit, CalComponent *comp,
         EToDoConduitContext *ctxt) 
{
    gboolean success;

    g_return_if_fail (conduit != NULL);
    g_return_if_fail (comp != NULL);

    LOG ("update_comp: saving to desktop\n%s\n", 
         cal_component_get_as_string (comp));

    success = cal_client_update_object (ctxt->client, comp);

    if (!success)
        WARN (_("Error while communicating with calendar server"));
}

static void
check_for_slow_setting (GnomePilotConduit *c, EToDoConduitContext *ctxt)
{
    int count, map_count;

    count = g_list_length (ctxt->uids);
    map_count = g_hash_table_size (ctxt->map);
    
    /* If there are no objects or objects but no log */
    if ((count == 0) || (count > 0 && map_count == 0)) {
        GnomePilotConduitStandard *conduit;
        LOG ("    doing slow sync\n");
        conduit = GNOME_PILOT_CONDUIT_STANDARD (c);
        gnome_pilot_conduit_standard_set_slow (conduit);
    } else {
        LOG ("    doing fast sync\n");
    }
}

static gint
update_record (GnomePilotConduitSyncAbs *conduit,
           GnomePilotRecord *remote,
           EToDoConduitContext *ctxt)
{
    CalComponent *comp;
    CalClientGetStatus status;
    struct ToDo todo;
    const char *uid;

    LOG ("update_record\n");

    g_return_val_if_fail (remote != NULL, -1);

    memset (&todo, 0, sizeof (struct ToDo));
    unpack_ToDo (&todo, remote->record, remote->length);

    uid = g_hash_table_lookup (ctxt->map, &remote->ID);
    
    if (uid)
        status = cal_client_get_object (ctxt->client, uid, &comp);
    else
        status = CAL_CLIENT_LOAD_ERROR;
    
    if (status != CAL_CLIENT_GET_SUCCESS) {
        LOG ("  new record being created\n");
        comp = comp_from_remote_record (conduit, remote, NULL);
    } else {
        CalComponent *new_comp;

        LOG ("  record found\n");

        new_comp = comp_from_remote_record (conduit, remote, comp);
        gtk_object_unref (GTK_OBJECT (comp));
        comp = new_comp;
    }

    update_comp (conduit, comp, ctxt);

    if (!uid) {
        guint32 *pid = g_new (guint32, 1);

        *pid = remote->ID;
        cal_component_get_uid (comp, &uid);
        g_hash_table_insert (ctxt->map, pid, g_strdup (uid));
    }
    
    gtk_object_unref (GTK_OBJECT (comp));
    free_ToDo(&todo);

    return 0;
}

/* Pilot syncing callbacks */
static gint
pre_sync (GnomePilotConduit *conduit,
      GnomePilotDBInfo *dbi,
      EToDoConduitContext *ctxt)
{
    GnomePilotConduitSyncAbs *abs_conduit;
    GList *l;
    int len;
    unsigned char *buf;
    char *filename;
    xmlSAXHandler handler;
    gint num_records;

    abs_conduit = GNOME_PILOT_CONDUIT_SYNC_ABS (conduit);

    LOG ("---------------------------------------------------------\n");
    LOG ("pre_sync: ToDo Conduit v.%s", CONDUIT_VERSION);
    g_message ("ToDo Conduit v.%s", CONDUIT_VERSION);

    ctxt->client = NULL;
    
    if (start_calendar_server (ctxt) != 0) {
        WARN(_("Could not start wombat server"));
        gnome_pilot_conduit_error (conduit, _("Could not start wombat"));
        return -1;
    }

    /* Get the local database */
    ctxt->uids = cal_client_get_uids (ctxt->client, CALOBJ_TYPE_TODO);
    
    /* Load the uid <--> pilot id mapping */
    ctxt->map = g_hash_table_new (g_int_hash, g_int_equal);

    filename = map_name (ctxt);
    if (g_file_exists (filename)) {
        memset (&handler, 0, sizeof (xmlSAXHandler));
        handler.startElement = map_sax_start_element;
        
        if (xmlSAXUserParseFile (&handler, ctxt, filename) < 0)
            return -1;
    }
    
    g_free (filename);

    /* Find the added, modified and deleted items */
    ctxt->added = g_hash_table_new (g_str_hash, g_str_equal);
    ctxt->modified = g_hash_table_new (g_str_hash, g_str_equal);
    ctxt->deleted = g_hash_table_new (g_str_hash, g_str_equal);

    ctxt->changed = cal_client_get_changed_uids (ctxt->client, 
                             CALOBJ_TYPE_TODO,
                             ctxt->since);
    for (l = ctxt->changed; l != NULL; l = l->next) {
        CalObjChange *coc = l->data;
        
        switch (coc->type) {
        case CALOBJ_UPDATED:
            if (g_hash_table_lookup (ctxt->map, coc->uid))
                g_hash_table_insert (ctxt->modified, coc->uid, coc);
            else
                g_hash_table_insert (ctxt->added, coc->uid, coc);
            break;
        case CALOBJ_REMOVED:
            g_hash_table_insert (ctxt->deleted, coc->uid, coc);
            break;
        }
    }

    /* Set the count information */
    num_records = cal_client_get_n_objects (ctxt->client, CALOBJ_TYPE_TODO);
    gnome_pilot_conduit_sync_abs_set_num_local_records(abs_conduit, num_records);
    num_records = g_hash_table_size (ctxt->added);
    gnome_pilot_conduit_sync_abs_set_num_new_local_records (abs_conduit, num_records);
    num_records = g_hash_table_size (ctxt->modified);
    gnome_pilot_conduit_sync_abs_set_num_updated_local_records (abs_conduit, num_records);
    num_records = g_hash_table_size (ctxt->deleted);
    gnome_pilot_conduit_sync_abs_set_num_deleted_local_records(abs_conduit, num_records);

    gtk_object_set_data (GTK_OBJECT (conduit), "dbinfo", dbi);

    buf = (unsigned char*)g_malloc (0xffff);
    len = dlp_ReadAppBlock (dbi->pilot_socket, dbi->db_handle, 0,
                  (unsigned char *)buf, 0xffff);
    
    if (len < 0) {
        WARN (_("Could not read pilot's ToDo application block"));
        WARN ("dlp_ReadAppBlock(...) = %d", len);
        gnome_pilot_conduit_error (conduit,
                       _("Could not read pilot's ToDo application block"));
        return -1;
    }
    unpack_ToDoAppInfo (&(ctxt->ai), buf, len);
    g_free (buf);

    check_for_slow_setting (conduit, ctxt);

    return 0;
}

static gint
post_sync (GnomePilotConduit *conduit,
       GnomePilotDBInfo *dbi,
       EToDoConduitContext *ctxt)
{
    gchar *filename;
    
    LOG ("post_sync: ToDo Conduit v.%s", CONDUIT_VERSION);
    LOG ("---------------------------------------------------------\n");

    filename = map_name (ctxt);
    map_write (ctxt, filename);
    g_free (filename);
    
    return 0;
}

static gint
set_pilot_id (GnomePilotConduitSyncAbs *conduit,
          EToDoLocalRecord *local,
          guint32 ID,
          EToDoConduitContext *ctxt)
{
    const char *uid;
    guint32 *pid = g_new (guint32, 1);
    
    cal_component_get_uid (local->comp, &uid);
    *pid = ID;
    g_hash_table_insert (ctxt->map, pid, g_strdup (uid));

        return 0;
}

static gint
for_each (GnomePilotConduitSyncAbs *conduit,
      EToDoLocalRecord **local,
      EToDoConduitContext *ctxt)
{
    static GList *uids, *iterator;
    static int count;

    g_return_val_if_fail (local != NULL, -1);

    if (*local == NULL) {
        LOG ("beginning for_each");

        uids = ctxt->uids;
        count = 0;
        
        if (uids != NULL) {
            LOG ("iterating over %d records", g_list_length (uids));

            *local = g_new0 (EToDoLocalRecord, 1);
            local_record_from_uid (*local, uids->data, ctxt);

            iterator = uids;
        } else {
            LOG ("no events");
            (*local) = NULL;
            return 0;
        }
    } else {
        count++;
        if (g_list_next (iterator)) {
            iterator = g_list_next (iterator);

            *local = g_new0 (EToDoLocalRecord, 1);
            local_record_from_uid (*local, iterator->data, ctxt);
        } else {
            LOG ("for_each ending");

            /* Tell the pilot the iteration is over */
            *local = NULL;

            return 0;
        }
    }

    return 0;
}

static gint
for_each_modified (GnomePilotConduitSyncAbs *conduit,
           EToDoLocalRecord **local,
           EToDoConduitContext *ctxt)
{
    static GList *changes, *iterator;
    static int count;

    g_return_val_if_fail (local != NULL, 0);

    if (*local == NULL) {
        LOG ("beginning for_each_modified: beginning\n");
        
        changes = ctxt->changed;
        
        count = 0;
        
        if (changes != NULL) {
            CalObjChange *coc = changes->data;
            
            LOG ("iterating over %d records", g_list_length (changes));
             
            *local = g_new0 (EToDoLocalRecord, 1);
            local_record_from_uid (*local, coc->uid, ctxt);

            iterator = changes;
        } else {
            LOG ("no events");
            (*local) = NULL;
            return 0;
        }
    } else {
        count++;
        if (g_list_next (iterator)) {
            CalObjChange *coc;

            iterator = g_list_next (iterator);
            coc = iterator->data;

            *local = g_new0 (EToDoLocalRecord, 1);
            local_record_from_uid (*local, coc->uid, ctxt);
        } else {
            LOG ("for_each_modified ending");

            /* Tell the pilot the iteration is over */
            (*local) = NULL;

            return 0;
        }
    }

    return 0;
}

static gint
compare (GnomePilotConduitSyncAbs *conduit,
     EToDoLocalRecord *local,
     GnomePilotRecord *remote,
     EToDoConduitContext *ctxt)
{
    /* used by the quick compare */
    GnomePilotRecord *local_pilot;
    int retval = 0;

    LOG ("compare: local=%s remote=%s...\n",
        print_local (local), print_remote (remote));

    g_return_val_if_fail (local!=NULL,-1);
    g_return_val_if_fail (remote!=NULL,-1);

    local_pilot = local_record_to_pilot_record (local, ctxt);
    if (!local_pilot) 
        return -1;

    if (remote->length != local_pilot->length
        || memcmp (local_pilot->record, remote->record, remote->length))
        retval = 1;

    if (retval == 0)
        LOG ("    match.\n");
    else
        LOG ("    did not match");
    
    g_free (local_pilot);
    
    return retval;
}

static gint
add_record (GnomePilotConduitSyncAbs *conduit,
        GnomePilotRecord *remote,
        EToDoConduitContext *ctxt)
{
    int ret;

    g_return_val_if_fail (remote != NULL, -1);

    LOG ("add_record: adding %s to desktop\n", print_remote (remote));

    ret = update_record (conduit, remote, ctxt);

    return ret;
}

static gint
add_archive_record (GnomePilotConduitSyncAbs *conduit,
            EToDoLocalRecord *local,
            GnomePilotRecord *remote,
            EToDoConduitContext *ctxt)
{
    g_return_val_if_fail (remote != NULL, -1); 
    g_return_val_if_fail (local != NULL, -1);

    LOG ("add_archive_record: doing nothing with %s\n",
         print_local (local));

    return -1;
}

static gint
delete_record (GnomePilotConduitSyncAbs *conduit,
           EToDoLocalRecord *local,
           EToDoConduitContext *ctxt)
{
    const char *uid;

    g_return_val_if_fail (local != NULL, -1);
    g_assert (local->comp != NULL);

    cal_component_get_uid (local->comp, &uid);

    LOG ("delete_record: deleting %s\n", uid);

    cal_client_remove_object (ctxt->client, uid);
    
        return 0;
}

static gint
delete_archive_record (GnomePilotConduitSyncAbs *conduit,
               EToDoLocalRecord *local,
               EToDoConduitContext *ctxt)
{
    g_return_val_if_fail(local!=NULL,-1);

    LOG ("delete_archive_record: doing nothing\n");

        return -1;
}

static gint
match (GnomePilotConduitSyncAbs *conduit,
       GnomePilotRecord *remote,
       EToDoLocalRecord **local,
       EToDoConduitContext *ctxt)
{
    char *uid;
    
    LOG ("match: looking for local copy of %s\n",
         print_remote (remote));    
    
    g_return_val_if_fail (local != NULL, -1);
    g_return_val_if_fail (remote != NULL, -1);

    *local = NULL;
    uid = g_hash_table_lookup (ctxt->map, &remote->ID);
    
    if (!uid)
        return 0;

    LOG ("  matched\n");
    
    *local = g_new0 (EToDoLocalRecord, 1);
    local_record_from_uid (*local, uid, ctxt);
    
    return 0;
}

static gint
free_match (GnomePilotConduitSyncAbs *conduit,
        EToDoLocalRecord **local,
        EToDoConduitContext *ctxt)
{
    LOG ("free_match: freeing\n");

    g_return_val_if_fail (local != NULL, -1);
    g_return_val_if_fail (*local != NULL, -1);

    gtk_object_unref (GTK_OBJECT ((*local)->comp));
    g_free (*local);

        *local = NULL;
    return 0;
}

static gint
prepare (GnomePilotConduitSyncAbs *conduit,
     EToDoLocalRecord *local,
     GnomePilotRecord **remote,
     EToDoConduitContext *ctxt)
{
    LOG ("prepare: encoding local %s\n", print_local (local));

    *remote = local_record_to_pilot_record (local, ctxt);

    if (!*remote)
        return -1;
    
    return 0;
}

static gint
free_prepare (GnomePilotConduitSyncAbs *conduit,
          EToDoLocalRecord *local,
          GnomePilotRecord **remote,
          EToDoConduitContext *ctxt)
{
    LOG ("free_prepare: freeing\n");

    g_return_val_if_fail (local != NULL, -1);
    g_return_val_if_fail (remote != NULL, -1);

    g_free (*remote);
    *remote = NULL;

        return 0;
}

static ORBit_MessageValidationResult
accept_all_cookies (CORBA_unsigned_long request_id,
            CORBA_Principal *principal,
            CORBA_char *operation)
{
    /* allow ALL cookies */
    return ORBIT_MESSAGE_ALLOW_ALL;
}


GnomePilotConduit *
conduit_get_gpilot_conduit (guint32 pilot_id)
{
    GtkObject *retval;
    EToDoConduitContext *ctxt;

    LOG ("in todo's conduit_get_gpilot_conduit\n");

    /* we need to find wombat with oaf, so make sure oaf
       is initialized here.  once the desktop is converted
       to oaf and gpilotd is built with oaf, this can go away */
    if (!oaf_is_initialized ()) {
        char *argv[ 1 ] = {"hi"};
        oaf_init (1, argv);

        if (bonobo_init (CORBA_OBJECT_NIL,
                 CORBA_OBJECT_NIL,
                 CORBA_OBJECT_NIL) == FALSE)
            g_error (_("Could not initialize Bonobo"));

        ORBit_set_request_validation_handler (accept_all_cookies);
    }

    retval = gnome_pilot_conduit_sync_abs_new ("ToDoDB", 0x746F646F);
    g_assert (retval != NULL);

    gnome_pilot_conduit_construct (GNOME_PILOT_CONDUIT (retval),
                       "e_todo_conduit");

    e_todo_context_new (&ctxt, pilot_id);
    gtk_object_set_data (GTK_OBJECT (retval), "todoconduit_context", ctxt);

    gtk_signal_connect (retval, "pre_sync", (GtkSignalFunc) pre_sync, ctxt);
    gtk_signal_connect (retval, "post_sync", (GtkSignalFunc) post_sync, ctxt);

    gtk_signal_connect (retval, "set_pilot_id", (GtkSignalFunc) set_pilot_id, ctxt);

    gtk_signal_connect (retval, "for_each", (GtkSignalFunc) for_each, ctxt);
    gtk_signal_connect (retval, "for_each_modified", (GtkSignalFunc) for_each_modified, ctxt);
    gtk_signal_connect (retval, "compare", (GtkSignalFunc) compare, ctxt);

    gtk_signal_connect (retval, "add_record", (GtkSignalFunc) add_record, ctxt);
/*      gtk_signal_connect (retval, "add_archive_record", (GtkSignalFunc) add_archive_record, ctxt); */

    gtk_signal_connect (retval, "delete_record", (GtkSignalFunc) delete_record, ctxt);
/*      gtk_signal_connect (retval, "delete_archive_record", (GtkSignalFunc) delete_archive_record, ctxt); */

    gtk_signal_connect (retval, "match", (GtkSignalFunc) match, ctxt);
    gtk_signal_connect (retval, "free_match", (GtkSignalFunc) free_match, ctxt);

    gtk_signal_connect (retval, "prepare", (GtkSignalFunc) prepare, ctxt);
    gtk_signal_connect (retval, "free_prepare", (GtkSignalFunc) free_prepare, ctxt);

    return GNOME_PILOT_CONDUIT (retval);
}

void
conduit_destroy_gpilot_conduit (GnomePilotConduit *conduit)
{ 
    EToDoConduitContext *ctxt;

    ctxt = gtk_object_get_data (GTK_OBJECT (conduit), 
                    "todoconduit_context");

    e_todo_context_destroy (&ctxt);

    gtk_object_destroy (GTK_OBJECT (conduit));
}