/********************************************************************\
 * qofgobj.c -- QOF to GLib GObject mapping                         *
 *                                                                  *
 * 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, contact:                        *
 *                                                                  *
 * Free Software Foundation           Voice:  +1-617-542-5942       *
 * 59 Temple Place - Suite 330        Fax:    +1-617-542-2652       *
 * Boston, MA  02111-1307,  USA       gnu@gnu.org                   *
 *                                                                  *
\********************************************************************/

#include <qof/gnc-trace.h>
#include <qof/qof.h>
#include <qof/qofgobj.h>

static short module = MOD_QUERY;

static gboolean initialized = FALSE;
static GSList *paramList = NULL;
static GSList *classList = NULL;

/* =================================================================== */

#if 0
static gboolean 
clear_table (gpointer key, gpointer value, gpointer user_data)
{
  g_slist_free (value);
  return TRUE;
}
#endif

void 
qof_gobject_init(void)
{
  if (initialized) return;
  initialized = TRUE;
                                                                                
  // gobjectClassTable = g_hash_table_new (g_str_hash, g_str_equal);

  /* Init the other subsystems that we need */
  qof_object_initialize();
  qof_query_init ();
}

void 
qof_gobject_shutdown (void)
{
  if (!initialized) return;
  initialized = FALSE;
                                                                                
  GSList *n;
  for (n=paramList; n; n=n->next) g_free(n->data);
  g_slist_free (paramList);

  for (n=classList; n; n=n->next) g_free(n->data);
  g_slist_free (classList);

#if 0
  // XXX also need to walk over books, and collection and delete
  // the collection get_data instance lists !!
  // without this we have a memory leak !!
  g_hash_table_foreach_remove (gobjectParamTable, clear_table, NULL);
  g_hash_table_destroy (gobjectParamTable);
#endif
}

/* =================================================================== */

#define GOBJECT_TABLE  "GobjectTable"

void 
qof_gobject_register_instance (QofBook *book, QofType type, GObject *gob)
{
  if (!book || !type) return;

  QofCollection *coll = qof_book_get_collection (book, type);

  GSList * instance_list = qof_collection_get_data (coll);
  instance_list = g_slist_prepend (instance_list, gob);
  qof_collection_set_data (coll, instance_list);
}

/* =================================================================== */

static gpointer
qof_gobject_getter (gpointer data, QofParam *getter)
{
  GObject *gob = data;

  GParamSpec *gps = getter->param_userdata;

  /* Note that the return type must actually be of type
   * getter->param_type but we just follow the hard-coded 
   * mapping below ... */
  if (G_IS_PARAM_SPEC_STRING(gps))
  {
    GValue gval = {G_TYPE_INVALID};
    g_value_init (&gval, G_TYPE_STRING);
    g_object_get_property (gob, getter->param_name, &gval);

    const char * str = g_value_get_string (&gval);
    return (gpointer) str;
  }
  else
  if (G_IS_PARAM_SPEC_INT(gps))
  {
    GValue gval = {G_TYPE_INVALID};
    g_value_init (&gval, G_TYPE_INT);
    g_object_get_property (gob, getter->param_name, &gval);

    int ival = g_value_get_int (&gval);
    return (gpointer) ival;
  }
  else
  if (G_IS_PARAM_SPEC_UINT(gps))
  {
    GValue gval = {G_TYPE_INVALID};
    g_value_init (&gval, G_TYPE_UINT);
    g_object_get_property (gob, getter->param_name, &gval);

    int ival = g_value_get_uint (&gval);
    return (gpointer) ival;
  }
  else
  if (G_IS_PARAM_SPEC_BOOLEAN(gps))
  {
    GValue gval = {G_TYPE_INVALID};
    g_value_init (&gval, G_TYPE_BOOLEAN);
    g_object_get_property (gob, getter->param_name, &gval);

    int ival = g_value_get_boolean (&gval);
    return (gpointer) ival;
  }

  PWARN ("unhandled parameter type %s for paramter %s", 
          G_PARAM_SPEC_TYPE_NAME(gps), getter->param_name);
  return NULL;
}

static double
qof_gobject_double_getter (gpointer data, QofParam *getter)
{
  GObject *gob = data;

  GParamSpec *gps = getter->param_userdata;

  /* Note that the return type must actually be of type
   * getter->param_type but we just follow the hard-coded 
   * mapping below ... */
  if (G_IS_PARAM_SPEC_FLOAT(gps))
  {
    GValue gval = {G_TYPE_INVALID};
    g_value_init (&gval, G_TYPE_FLOAT);
    g_object_get_property (gob, getter->param_name, &gval);

    double fval = g_value_get_float (&gval);
    return fval;
  }
  else
  if (G_IS_PARAM_SPEC_DOUBLE(gps))
  {
    GValue gval = {G_TYPE_INVALID};
    g_value_init (&gval, G_TYPE_DOUBLE);
    g_object_get_property (gob, getter->param_name, &gval);

    double fval = g_value_get_double (&gval);
    return fval;
  } 

  PWARN ("unhandled parameter type %s for paramter %s", 
          G_PARAM_SPEC_TYPE_NAME(gps), getter->param_name);
  return 0.0;
}

/* =================================================================== */
/* Loop over every instance of the given type in the collection
 * of instances that we have on hand.
 */
static void
qof_gobject_foreach (QofCollection *coll, QofEntityForeachCB cb, gpointer ud)
{
  GSList *n;
  n = qof_collection_get_data (coll);
  for (; n; n=n->next)
  {
    cb (n->data, ud);
  }
}
                                                                                
/* =================================================================== */

void
qof_gobject_register (QofType e_type, GObjectClass *obclass)
{

  /* Get the GObject properties, convert to QOF properties */
  GParamSpec **prop_list;
  int n_props;
  prop_list = g_object_class_list_properties (obclass, &n_props);

  QofParam * qof_param_list = g_new0 (QofParam, n_props);
  paramList = g_slist_prepend (paramList, qof_param_list);

  PINFO ("object %s has %d props", e_type, n_props);
  int i, j=0;
  for (i=0; i<n_props; i++)
  {
    GParamSpec *gparam = prop_list[i];
    QofParam *qpar = &qof_param_list[j];

    PINFO ("param %d %s is type %s", 
          i, gparam->name, G_PARAM_SPEC_TYPE_NAME(gparam));

    qpar->param_name = g_param_spec_get_name (gparam);
    qpar->param_getfcn = qof_gobject_getter;
    qpar->param_setfcn = NULL;
    qpar->param_userdata = gparam;
    if ((G_IS_PARAM_SPEC_INT(gparam))  ||
        (G_IS_PARAM_SPEC_UINT(gparam)) ||
        (G_IS_PARAM_SPEC_ENUM(gparam)) ||
        (G_IS_PARAM_SPEC_FLAGS(gparam)))
    {
      qpar->param_type = QOF_TYPE_INT32;
      j++;
    } 
    else
    if ((G_IS_PARAM_SPEC_INT64(gparam)) ||
        (G_IS_PARAM_SPEC_UINT64(gparam)))
    {
      qpar->param_type = QOF_TYPE_INT64;
      j++;
    } 
    else
    if (G_IS_PARAM_SPEC_BOOLEAN(gparam))
    {
      qpar->param_type = QOF_TYPE_BOOLEAN;
      j++;
    } 
    else
    if (G_IS_PARAM_SPEC_STRING(gparam))
    {
      qpar->param_type = QOF_TYPE_STRING;
      j++;
    } 
    else
    if ((G_IS_PARAM_SPEC_POINTER(gparam)) ||
        (G_IS_PARAM_SPEC_OBJECT(gparam)))
    {
      /* No-op, silently ignore.  Someday we should handle this ...  */
    } 
    else
    if ((G_IS_PARAM_SPEC_FLOAT(gparam)) ||
        (G_IS_PARAM_SPEC_DOUBLE(gparam)))
    {
      qpar->param_getfcn = (QofAccessFunc) qof_gobject_double_getter;
      qpar->param_type = QOF_TYPE_DOUBLE;
      j++;
    } 
    else
    if (G_IS_PARAM_SPEC_CHAR(gparam))
    {
      qpar->param_type = QOF_TYPE_CHAR;
      j++;
    } 
    else
    {
      PWARN ("Unknown/unhandled parameter type %s on %s:%s\n", 
      G_PARAM_SPEC_TYPE_NAME(gparam), e_type, qpar->param_name);
    }
  }

  /* NULL-terminated list! */
  qof_param_list[j].param_type = NULL;

  qof_class_register (e_type, NULL, qof_param_list);

  /* ------------------------------------------------------ */
   /* Now do the class itself */
  QofObject *class_def = g_new0 (QofObject, 1);
  classList = g_slist_prepend (classList, class_def);

  class_def->interface_version = QOF_OBJECT_VERSION;
  class_def->e_type = e_type;
  /* We could let the user specify a "nick" here, but
   * the actual class name seems reasonable, e.g. for debugging. */
  class_def->type_label = G_OBJECT_CLASS_NAME (obclass);
  class_def->new = NULL;
  class_def->book_begin = NULL;
  class_def->book_end = NULL;
  class_def->is_dirty = NULL;
  class_def->mark_clean = NULL;
  class_def->foreach = qof_gobject_foreach;
  class_def->printable = NULL;
 
  qof_object_register (class_def);
}

/* ======================= END OF FILE ================================ */