/* -*- Mode: C; c-basic-offset: 4 -*- */
#ifndef _PYGOBJECT_H_
#define _PYGOBJECT_H_

#include <Python.h>

#include <glib.h>
#include <glib-object.h>

G_BEGIN_DECLS

/* Work around bugs in PyGILState api fixed in 2.4.0a4 */
#if PY_HEXVERSION < 0x020400A4
#define PYGIL_API_IS_BUGGY TRUE
#else
#define PYGIL_API_IS_BUGGY FALSE
#endif

  /* PyGClosure is a _private_ structure */
typedef struct _PyGClosure PyGClosure;
struct _PyGClosure {
    GClosure closure;
    PyObject *callback;
    PyObject *extra_args; /* tuple of extra args to pass to callback */
    PyObject *swap_data; /* other object for gtk_signal_connect_object */
};

typedef struct {
    PyObject_HEAD
    GObject *obj;
    PyObject *inst_dict; /* the instance dictionary -- must be last */
    PyObject *weakreflist; /* list of weak references */
    GSList *closures;
} PyGObject;

#define pygobject_get(v) (((PyGObject *)(v))->obj)
#define pygobject_check(v,base) (PyObject_TypeCheck(v,base))

typedef struct {
    PyObject_HEAD
    gpointer boxed;
    GType gtype;
    gboolean free_on_dealloc;
} PyGBoxed;

#define pyg_boxed_get(v,t)      ((t *)((PyGBoxed *)(v))->boxed)
#define pyg_boxed_check(v,typecode) (PyObject_TypeCheck(v, &PyGBoxed_Type) && ((PyGBoxed *)(v))->gtype == typecode)

typedef struct {
    PyObject_HEAD
    gpointer pointer;
    GType gtype;
} PyGPointer;

#define pyg_pointer_get(v,t)      ((t *)((PyGPointer *)(v))->pointer)
#define pyg_pointer_check(v,typecode) (PyObject_TypeCheck(v, &PyGPointer_Type) && ((PyGPointer *)(v))->gtype == typecode)

typedef void (*PyGFatalExceptionFunc) (void);
typedef void (*PyGThreadBlockFunc) (void);

typedef struct {
    PyObject_HEAD
    GParamSpec *pspec;
} PyGParamSpec;

#define PyGParamSpec_Get(v) (((PyGParamSpec *)v)->pspec)
#define PyGParamSpec_Check(v) (PyObject_TypeCheck(v, &PyGParamSpec_Type))

struct _PyGObject_Functions {
    void (* register_class)(PyObject *dict, const gchar *class_name,
			    GType gtype, PyTypeObject *type, PyObject *bases);
    void (* register_wrapper)(PyObject *self);
    void (* register_sinkfunc)(GType type,
			       void (* sinkfunc)(GObject *object));
    PyTypeObject *(* lookup_class)(GType type);
    PyObject *(* newgobj)(GObject *obj);

    GClosure *(* closure_new)(PyObject *callback, PyObject *extra_args,
			      PyObject *swap_data);
    void      (* object_watch_closure)(PyObject *self, GClosure *closure);
    GDestroyNotify destroy_notify;

    GType (* type_from_object)(PyObject *obj);
    PyObject *(* type_wrapper_new)(GType type);

    gint (* enum_get_value)(GType enum_type, PyObject *obj, gint *val);
    gint (* flags_get_value)(GType flag_type, PyObject *obj, gint *val);
    void (* register_boxed_custom)(GType boxed_type,
			    PyObject *(* from_func)(const GValue *value),
			    int (* to_func)(GValue *value, PyObject *obj));
    int (* value_from_pyobject)(GValue *value, PyObject *obj);
    PyObject *(* value_as_pyobject)(const GValue *value, gboolean copy_boxed);

    void (* register_interface)(PyObject *dict, const gchar *class_name,
				GType gtype, PyTypeObject *type);

    PyTypeObject *boxed_type;
    void (* register_boxed)(PyObject *dict, const gchar *class_name,
			    GType boxed_type, PyTypeObject *type);
    PyObject *(* boxed_new)(GType boxed_type, gpointer boxed,
			    gboolean copy_boxed, gboolean own_ref);

    PyTypeObject *pointer_type;
    void (* register_pointer)(PyObject *dict, const gchar *class_name,
			      GType pointer_type, PyTypeObject *type);
    PyObject *(* pointer_new)(GType boxed_type, gpointer pointer);

    void (* enum_add_constants)(PyObject *module, GType enum_type,
				const gchar *strip_prefix);
    void (* flags_add_constants)(PyObject *module, GType flags_type,
				 const gchar *strip_prefix);

    gchar *(* constant_strip_prefix)(gchar *name,
				     const gchar *strip_prefix);

    gboolean (* error_check)(GError **error);

    /* hooks to register handlers for getting GDK threads to cooperate
     * with python threading */
    void (* set_thread_block_funcs) (PyGThreadBlockFunc block_threads_func,
				     PyGThreadBlockFunc unblock_threads_func);
    PyGThreadBlockFunc block_threads;
    PyGThreadBlockFunc unblock_threads;
    PyTypeObject *paramspec_type;
    PyObject *(* paramspec_new)(GParamSpec *spec);
    GParamSpec *(*paramspec_get)(PyObject *tuple);
    int (*pyobj_to_unichar_conv)(PyObject *pyobj, void* ptr);
    gboolean (*parse_constructor_args)(GType        obj_type,
                                       char       **arg_names,
                                       char       **prop_names,
                                       GParameter  *params,
                                       guint       *nparams,
                                       PyObject   **py_args);
    PyObject *(* param_gvalue_as_pyobject) (const GValue* gvalue, 
                                            gboolean copy_boxed,
					    const GParamSpec* pspec);
    int (* gvalue_from_param_pyobject) (GValue* value, 
                                        PyObject* py_obj, 
					const GParamSpec* pspec);
    PyTypeObject *enum_type;
    PyObject *(*enum_add)(PyObject *module,
			  const char *typename_,
			  const char *strip_prefix,
			  GType gtype);
    PyObject* (*enum_from_gtype)(GType gtype, int value);
    
    PyTypeObject *flags_type;
    PyObject *(*flags_add)(PyObject *module,
			   const char *typename_,
			   const char *strip_prefix,
			   GType gtype);
    PyObject* (*flags_from_gtype)(GType gtype, int value);

    gboolean threads_enabled;
    int       (*enable_threads) (void);
    int       (*gil_state_ensure) (void);
    void      (*gil_state_release) (int flag);
};

#ifndef _INSIDE_PYGOBJECT_

#if defined(NO_IMPORT) || defined(NO_IMPORT_PYGOBJECT)
extern struct _PyGObject_Functions *_PyGObject_API;
#else
struct _PyGObject_Functions *_PyGObject_API;
#endif

#define pygobject_register_class    (_PyGObject_API->register_class)
#define pygobject_register_wrapper  (_PyGObject_API->register_wrapper)
#define pygobject_register_sinkfunc (_PyGObject_API->register_sinkfunc)
#define pygobject_lookup_class      (_PyGObject_API->lookup_class)
#define pygobject_new               (_PyGObject_API->newgobj)
#define pyg_closure_new             (_PyGObject_API->closure_new)
#define pygobject_watch_closure     (_PyGObject_API->object_watch_closure)
#define pyg_destroy_notify          (_PyGObject_API->destroy_notify)
#define pyg_type_from_object        (_PyGObject_API->type_from_object)
#define pyg_type_wrapper_new        (_PyGObject_API->type_wrapper_new)
#define pyg_enum_get_value          (_PyGObject_API->enum_get_value)
#define pyg_flags_get_value         (_PyGObject_API->flags_get_value)
#define pyg_register_boxed_custom   (_PyGObject_API->register_boxed_custom)
#define pyg_value_from_pyobject     (_PyGObject_API->value_from_pyobject)
#define pyg_value_as_pyobject       (_PyGObject_API->value_as_pyobject)
#define pyg_register_interface      (_PyGObject_API->register_interface)
#define PyGBoxed_Type               (*_PyGObject_API->boxed_type)
#define pyg_register_boxed          (_PyGObject_API->register_boxed)
#define pyg_boxed_new               (_PyGObject_API->boxed_new)
#define PyGPointer_Type             (*_PyGObject_API->pointer_type)
#define pyg_register_pointer        (_PyGObject_API->register_pointer)
#define pyg_pointer_new             (_PyGObject_API->pointer_new)
#define pyg_enum_add_constants      (_PyGObject_API->enum_add_constants)
#define pyg_flags_add_constants     (_PyGObject_API->flags_add_constants)
#define pyg_constant_strip_prefix   (_PyGObject_API->constant_strip_prefix)
#define pyg_error_check             (_PyGObject_API->error_check)
#define pyg_set_thread_block_funcs  (_PyGObject_API->set_thread_block_funcs)
#define PyGParamSpec_Type           (*_PyGObject_API->paramspec_type)
#define pyg_param_spec_new          (_PyGObject_API->paramspec_new)
#define pyg_param_spec_from_object  (_PyGObject_API->paramspec_get)
#define pyg_pyobj_to_unichar_conv   (_PyGObject_API->pyobj_to_unichar_conv)
#define pyg_parse_constructor_args  (_PyGObject_API->parse_constructor_args)
#define pyg_param_gvalue_from_pyobject (_PyGObject_API->value_from_pyobject)
#define pyg_param_gvalue_as_pyobject   (_PyGObject_API->value_as_pyobject)
#define PyGEnum_Type                (*_PyGObject_API->enum_type)
#define pyg_enum_add                (_PyGObject_API->enum_add)
#define pyg_enum_from_gtype         (_PyGObject_API->enum_from_gtype)
#define PyGFlags_Type               (*_PyGObject_API->flags_type)
#define pyg_flags_add               (_PyGObject_API->flags_add)
#define pyg_flags_from_gtype        (_PyGObject_API->flags_from_gtype)
#define pyg_enable_threads          (_PyGObject_API->enable_threads)

#define pyg_block_threads()   G_STMT_START {   \
    if (_PyGObject_API->block_threads != NULL) \
      (* _PyGObject_API->block_threads)();     \
  } G_STMT_END
#define pyg_unblock_threads() G_STMT_START {     \
    if (_PyGObject_API->unblock_threads != NULL) \
      (* _PyGObject_API->unblock_threads)();     \
  } G_STMT_END

#define pyg_threads_enabled (_PyGObject_API->threads_enabled)

#define pyg_gil_state_ensure() (_PyGObject_API->threads_enabled? (_PyGObject_API->gil_state_ensure()) : 0)
#define pyg_gil_state_release(state) G_STMT_START {     \
    if (_PyGObject_API->threads_enabled)                \
        _PyGObject_API->gil_state_release(state);       \
    } G_STMT_END

#define pyg_begin_allow_threads                 \
    G_STMT_START {                              \
        PyThreadState *_save = NULL;            \
        if (_PyGObject_API->threads_enabled)    \
            _save = PyEval_SaveThread();
#define pyg_end_allow_threads                   \
        if (_PyGObject_API->threads_enabled)    \
            PyEval_RestoreThread(_save);        \
    } G_STMT_END

#define init_pygobject() { \
    PyObject *gobject = PyImport_ImportModule("gobject"); \
    if (gobject != NULL) { \
        PyObject *mdict = PyModule_GetDict(gobject); \
        PyObject *cobject = PyDict_GetItemString(mdict, "_PyGObject_API"); \
        if (PyCObject_Check(cobject)) \
            _PyGObject_API = (struct _PyGObject_Functions *)PyCObject_AsVoidPtr(cobject); \
        else { \
            PyErr_SetString(PyExc_RuntimeError, \
                            "could not find _PyGObject_API object"); \
	    return; \
        } \
    } else { \
        PyErr_SetString(PyExc_ImportError, \
                        "could not import gobject"); \
        return; \
    } \
}

#endif /* !_INSIDE_PYGOBJECT_ */

G_END_DECLS

#endif /* !_PYGOBJECT_H_ */
