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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <Eina.h>

#include "eldbus_model_proxy_private.h"
#include "eldbus_model_private.h"

#define MY_CLASS ELDBUS_MODEL_PROXY_CLASS
#define MY_CLASS_NAME "Eldbus_Model_Proxy"

static void _eldbus_model_proxy_property_get_all_cb(void *, const Eldbus_Message *, Eldbus_Pending *);
static void _eldbus_model_proxy_property_set_cb(void *, const Eldbus_Message *, Eldbus_Pending *);
static void _eldbus_model_proxy_property_set_load_cb(void *, const Eldbus_Message *, Eldbus_Pending *);
static void _eldbus_model_proxy_start_monitor(Eldbus_Model_Proxy_Data *);
static void _eldbus_model_proxy_property_changed_cb(void *, Eldbus_Proxy *, void *);
static void _eldbus_model_proxy_property_invalidated_cb(void *, Eldbus_Proxy *, void *);
static const char *_eldbus_model_proxy_property_type_get(Eldbus_Model_Proxy_Data *, const char *);
static void _eldbus_model_proxy_create_methods_children(Eldbus_Model_Proxy_Data *);
static void _eldbus_model_proxy_create_signals_children(Eldbus_Model_Proxy_Data *);


typedef struct _Eldbus_Model_Proxy_Property_Set_Data Eldbus_Model_Proxy_Property_Set_Data;
typedef struct _Eldbus_Property_Promise Eldbus_Property_Promise;

struct _Eldbus_Model_Proxy_Property_Set_Data
{
   Eldbus_Model_Proxy_Data *pd;

   Eina_Stringshare *property;
   Eina_Promise *promise;
   Eina_Value *value;
};

struct _Eldbus_Property_Promise
{
  Eina_Promise *promise;
  Eina_Stringshare *property;
};

static void _eldbus_model_proxy_property_set_data_free(Eldbus_Model_Proxy_Property_Set_Data *);

static Eina_Bool
_eldbus_model_proxy_load(Eldbus_Model_Proxy_Data *pd)
{
   Eldbus_Introspection_Property *property;
   Eina_List *it;

   if (pd->proxy)
     return EINA_TRUE;

   pd->proxy = eldbus_proxy_get(pd->object, pd->name);
   EINA_SAFETY_ON_NULL_RETURN_VAL(pd->proxy, EINA_FALSE);

   EINA_LIST_FOREACH(pd->interface->properties, it, property)
     {
        const Eina_Value_Type *type;
        Eina_Stringshare *name;
        Eina_Value *value;

        type = _dbus_type_to_eina_value_type(property->type[0]);
        name = eina_stringshare_add(property->name);
        value = eina_value_new(type);

        eina_hash_direct_add(pd->properties, name, value);
     }

   return EINA_TRUE;
}

static void
_eldbus_model_proxy_unload(Eldbus_Model_Proxy_Data *pd)
{
   Eldbus_Pending *pending;

   EINA_LIST_FREE(pd->pendings, pending)
     eldbus_pending_cancel(pending);

   if (pd->monitoring)
     {
        eldbus_proxy_event_callback_del(pd->proxy,
                                        ELDBUS_PROXY_EVENT_PROPERTY_CHANGED,
                                        _eldbus_model_proxy_property_changed_cb,
                                        pd);
        eldbus_proxy_event_callback_del(pd->proxy,
                                        ELDBUS_PROXY_EVENT_PROPERTY_REMOVED,
                                        _eldbus_model_proxy_property_invalidated_cb,
                                        pd);
     }
   pd->monitoring = EINA_FALSE;

   if (pd->proxy) eldbus_proxy_unref(pd->proxy);
   pd->proxy = NULL;
}

static void
_eldbus_model_proxy_object_del(void *data, Eldbus_Object *object EINA_UNUSED, void *event_info EINA_UNUSED)
{
   Eldbus_Model_Proxy_Data *pd = data;

   pd->object = NULL;
}

static Efl_Object*
_eldbus_model_proxy_efl_object_constructor(Eo *obj, Eldbus_Model_Proxy_Data *pd)
{
   obj = efl_constructor(efl_super(obj, MY_CLASS));

   pd->obj = obj;
   pd->properties = eina_hash_stringshared_new(NULL);

   return obj;
}

static Efl_Object*
_eldbus_model_proxy_efl_object_finalize(Eo *obj, Eldbus_Model_Proxy_Data *pd)
{
   if (!pd->object ||
       !pd->name ||
       !pd->interface)
     return NULL;

   if (!_eldbus_model_proxy_load(pd)) return NULL;

   if (!eldbus_model_connection_get(obj))
     eldbus_model_connection_set(obj, eldbus_object_connection_get(pd->object));

   eldbus_object_event_callback_add(pd->object, ELDBUS_OBJECT_EVENT_DEL, _eldbus_model_proxy_object_del, pd);

   return efl_finalize(efl_super(obj, MY_CLASS));
}

static void
_eldbus_model_proxy_object_set(Eo *obj EINA_UNUSED,
                               Eldbus_Model_Proxy_Data *pd,
                               Eldbus_Object *object)
{
   pd->object = eldbus_object_ref(object);
}

static void
_eldbus_model_proxy_interface_set(Eo *obj EINA_UNUSED,
                                  Eldbus_Model_Proxy_Data *pd,
                                  const Eldbus_Introspection_Interface *interface)
{
   pd->name = eina_stringshare_add(interface->name);
   pd->interface = interface;
}

static void
_eldbus_model_proxy_efl_object_invalidate(Eo *obj, Eldbus_Model_Proxy_Data *pd)
{
   Eo *child;

   EINA_LIST_FREE(pd->childrens, child)
     efl_unref(child);

   _eldbus_model_proxy_unload(pd);

   if (pd->object)
     {
        eldbus_object_event_callback_del(pd->object, ELDBUS_OBJECT_EVENT_DEL, _eldbus_model_proxy_object_del, pd);
        eldbus_object_unref(pd->object);
     }

   efl_invalidate(efl_super(obj, MY_CLASS));
}

static void
_eldbus_model_proxy_efl_object_destructor(Eo *obj, Eldbus_Model_Proxy_Data *pd)
{
   Eina_Hash_Tuple *tuple;
   Eina_Iterator *it;

   it = eina_hash_iterator_tuple_new(pd->properties);
   EINA_ITERATOR_FOREACH(it, tuple)
     {
        Eina_Stringshare *property = tuple->key;
        Eina_Value *value = tuple->data;

        eina_stringshare_del(property);
        eina_value_free(value);
     }
   eina_iterator_free(it);
   eina_hash_free(pd->properties);

   eina_stringshare_del(pd->name);

   efl_destructor(efl_super(obj, MY_CLASS));
}

static Eina_Iterator *
_eldbus_model_proxy_efl_model_properties_get(const Eo *obj EINA_UNUSED,
                                             Eldbus_Model_Proxy_Data *pd)
{
   return eina_hash_iterator_key_new(pd->properties);
}

#define PROPERTY_EXIST 1
#define PROPERTY_READ  2
#define PROPERTY_WRITE 4

static unsigned char
eldbus_model_proxy_property_check(Eldbus_Model_Proxy_Data *pd,
                                  const char *property)
{
    Eldbus_Introspection_Property *property_introspection =
      eldbus_introspection_property_find(pd->interface->properties, property);
    unsigned char r = 0;

    if (property_introspection == NULL)
       {
          WRN("Property not found: %s", property);
          return 0;
       }

    r = PROPERTY_EXIST;
    // Check read access
    if (property_introspection->access == ELDBUS_INTROSPECTION_PROPERTY_ACCESS_READ ||
        property_introspection->access == ELDBUS_INTROSPECTION_PROPERTY_ACCESS_READWRITE)
      r |= PROPERTY_READ;
    // Check write access
    if (property_introspection->access == ELDBUS_INTROSPECTION_PROPERTY_ACCESS_WRITE ||
        property_introspection->access == ELDBUS_INTROSPECTION_PROPERTY_ACCESS_READWRITE)
      r |= PROPERTY_WRITE;

    return r;
}

static void
_eldbus_model_proxy_cancel_cb(void *data,
                              Efl_Loop_Consumer *consumer EINA_UNUSED,
                              const Eina_Promise *dead_promise EINA_UNUSED)
{
   Eldbus_Model_Proxy_Property_Set_Data *sd = data;

   sd->promise = NULL;
}

static Eldbus_Pending *
_eldbus_model_proxy_load_all(Eldbus_Model_Proxy_Data *pd,
                             Eina_Promise *promise, const char *property,
                             Eldbus_Message_Cb callback,
                             void *data)
{
   Eldbus_Property_Promise *p;
   Eldbus_Pending *pending = NULL;

   p = calloc(1, sizeof(Eldbus_Property_Promise));
   if (!p)
     {
        if (promise) eina_promise_reject(promise, ENOMEM);
        return NULL;
     }

   p->promise = promise;
   p->property = eina_stringshare_add(property);
   pd->promises = eina_list_append(pd->promises, p);

   if (!pd->pendings)
     {
        pending = eldbus_proxy_property_get_all(pd->proxy, callback, data);
     }
   return pending;
}

static Eina_Future *
_eldbus_model_proxy_efl_model_property_set(Eo *obj EINA_UNUSED,
                                           Eldbus_Model_Proxy_Data *pd,
                                           const char *property,
                                           Eina_Value *value)
{
   Eldbus_Model_Proxy_Property_Set_Data *data;
   const char *signature;
   Eldbus_Pending *pending;
   unsigned char access;
   Eina_Error err = 0;

   DBG("(%p): property=%s", obj, property);

   access = eldbus_model_proxy_property_check(pd, property);
   err = EFL_MODEL_ERROR_NOT_FOUND;
   if (!access) goto on_error;
   err = EFL_MODEL_ERROR_READ_ONLY;
   if (!(access & PROPERTY_WRITE)) goto on_error;

   err = EFL_MODEL_ERROR_UNKNOWN;
   signature = _eldbus_model_proxy_property_type_get(pd, property);
   if (!signature) goto on_error;

   err = ENOMEM;
   data = calloc(1, sizeof (Eldbus_Model_Proxy_Property_Set_Data));
   if (!data) goto on_error;

   data->pd = pd;
   data->promise = efl_loop_promise_new(obj, data, _eldbus_model_proxy_cancel_cb, NULL);
   data->property = eina_stringshare_add(property);
   if (!(data->value = eina_value_dup(value))) goto on_error;

   if (!pd->is_loaded)
     {
        pending = _eldbus_model_proxy_load_all(pd, data->promise, property,
                                               _eldbus_model_proxy_property_set_load_cb, data);
     }
   else
     {
        pending = eldbus_proxy_property_value_set(pd->proxy, property, signature, (Eina_Value*)value,
                                                  _eldbus_model_proxy_property_set_cb, data);
     }

   if (pending) pd->pendings = eina_list_append(pd->pendings, pending);
   return efl_future_then(obj, eina_future_new(data->promise));

 on_error:
   return efl_loop_future_rejected(obj, err);
}

static Eina_Value *
_eldbus_model_proxy_efl_model_property_get(const Eo *obj EINA_UNUSED,
                                           Eldbus_Model_Proxy_Data *pd,
                                           const char *property)
{
   Eldbus_Pending *pending;
   unsigned char access;
   Eina_Error err = 0;

   access = eldbus_model_proxy_property_check(pd, property);
   err = EFL_MODEL_ERROR_NOT_FOUND;
   if (!access) goto on_error;
   if (!(access & PROPERTY_READ)) goto on_error;

   if (pd->is_loaded)
     {
        Eina_Stringshare *tmp;
        Eina_Value *value;

        err = EFL_MODEL_ERROR_NOT_FOUND;
        tmp = eina_stringshare_add(property);
        value = eina_hash_find(pd->properties, tmp);
        eina_stringshare_del(tmp);
        if (!value) goto on_error;

        return eina_value_dup(value);
     }

   err = ENOMEM;

   pending = _eldbus_model_proxy_load_all(pd, NULL, property,
                                          _eldbus_model_proxy_property_get_all_cb, pd);
   if (pending) pd->pendings = eina_list_append(pd->pendings, pending);
   else goto on_error;

   return eina_value_error_new(EAGAIN);

 on_error:
   return eina_value_error_new(err);
}

static void
_eldbus_model_proxy_listed(Eldbus_Model_Proxy_Data *pd)
{
   if (!pd->is_listed)
     {
        _eldbus_model_proxy_create_methods_children(pd);
        _eldbus_model_proxy_create_signals_children(pd);

        efl_event_callback_call(pd->obj, EFL_MODEL_EVENT_CHILDREN_COUNT_CHANGED, NULL);
        pd->is_listed = EINA_TRUE;
     }
}

static Eina_Future*
_eldbus_model_proxy_efl_model_children_slice_get(Eo *obj EINA_UNUSED,
                                                 Eldbus_Model_Proxy_Data *pd,
                                                 unsigned start,
                                                 unsigned count)
{
   Eina_Value v;

   _eldbus_model_proxy_listed(pd);

   v = efl_model_list_value_get(pd->childrens, start, count);
   return efl_loop_future_resolved(obj, v);
}

static unsigned int
_eldbus_model_proxy_efl_model_children_count_get(const Eo *obj EINA_UNUSED,
                                                 Eldbus_Model_Proxy_Data *pd)
{
   _eldbus_model_proxy_listed(pd);
   return eina_list_count(pd->childrens);
}

static void
_eldbus_model_proxy_create_methods_children(Eldbus_Model_Proxy_Data *pd)
{
   Eldbus_Introspection_Method *method;
   Eina_List *it;

   EINA_LIST_FOREACH(pd->interface->methods, it, method)
     {
        const char *bus;
        const char *path;
        const char *interface_name;
        const char *method_name;
        Eo *child;

        bus = eldbus_object_bus_name_get(pd->object);
        if (!bus) continue;

        path = eldbus_object_path_get(pd->object);
        if (!path) continue;

        interface_name = pd->interface->name;
        if (!interface_name) continue;

        method_name = method->name;
        if (!method_name) continue;

        INF("(%p) Creating method child: bus = %s, path = %s, method = %s::%s",
                       pd->obj, bus, path, interface_name, method_name);

        child = efl_add_ref(ELDBUS_MODEL_METHOD_CLASS, pd->obj,
                            eldbus_model_method_proxy_set(efl_added, pd->proxy),
                            eldbus_model_method_set(efl_added, method));

        if (child) pd->childrens = eina_list_append(pd->childrens, child);
        else ERR("Could not create method child: bus = %s, path = %s method = %s::%s.",
                 bus, path, interface_name, method_name);
     }
}

static void
_eldbus_model_proxy_create_signals_children(Eldbus_Model_Proxy_Data *pd)
{
   Eina_List *it;
   Eldbus_Introspection_Signal *signal;

   EINA_LIST_FOREACH(pd->interface->signals, it, signal)
     {
        const char *bus;
        const char *path;
        const char *interface_name;
        const char *signal_name;
        Eo *child;

        bus = eldbus_object_bus_name_get(pd->object);
        if (!bus) continue;

        path = eldbus_object_path_get(pd->object);
        if (!path) continue;

        interface_name = pd->interface->name;
        if (!interface_name) continue;

        signal_name = signal->name;
        if (!signal_name) continue;

        DBG("(%p) Creating signal child: bus = %s, path = %s, signal = %s::%s",
                       pd->obj, bus, path, interface_name, signal_name);

        child = efl_add_ref(ELDBUS_MODEL_SIGNAL_CLASS, pd->obj, eldbus_model_signal_constructor(efl_added, pd->proxy, signal));

        if (child) pd->childrens = eina_list_append(pd->childrens, child);
        else ERR("Could not create signal child: bus = %s, path = %s signal = %s::%s.",
                 bus, path, interface_name, signal_name);
     }
}

static const char *
_eldbus_model_proxy_proxy_name_get(const Eo *obj EINA_UNUSED, Eldbus_Model_Proxy_Data *pd)
{
   return pd->name;
}

static void
_eldbus_model_proxy_start_monitor(Eldbus_Model_Proxy_Data *pd)
{
   if (pd->monitoring)
     return;

   pd->monitoring = EINA_TRUE;

   eldbus_proxy_event_callback_add(pd->proxy,
                                   ELDBUS_PROXY_EVENT_PROPERTY_CHANGED,
                                   _eldbus_model_proxy_property_changed_cb,
                                   pd);

   eldbus_proxy_event_callback_add(pd->proxy,
                                   ELDBUS_PROXY_EVENT_PROPERTY_REMOVED,
                                   _eldbus_model_proxy_property_invalidated_cb,
                                   pd);
}

static void
_eldbus_model_proxy_property_changed_cb(void *data,
                                        Eldbus_Proxy *proxy EINA_UNUSED,
                                        void *event_info)
{
   Eldbus_Model_Proxy_Data *pd = (Eldbus_Model_Proxy_Data*)data;
   Eldbus_Object_Event_Property_Changed *event = (Eldbus_Object_Event_Property_Changed*)event_info;
   Eina_Value *prop_value;
   Eina_Bool ret;

   prop_value = eina_hash_find(pd->properties, event->name);
   if (!prop_value) return ;

   ret = eina_value_copy(event->value, prop_value);
   if (!ret) return ;

   efl_model_properties_changed(pd->obj, event->name);
}

static void
_eldbus_model_proxy_property_invalidated_cb(void *data,
                                            Eldbus_Proxy *proxy EINA_UNUSED,
                                            void *event_info)
{
   Eldbus_Model_Proxy_Data *pd = (Eldbus_Model_Proxy_Data*)data;
   Eldbus_Proxy_Event_Property_Changed *event = (Eldbus_Proxy_Event_Property_Changed*)event_info;

   efl_model_property_invalidated_notify(pd->obj, event->name);
}

static Eina_Array *
_eldbus_model_proxy_property_get_all_load(const Eldbus_Message *msg, Eldbus_Model_Proxy_Data *pd)
{
   Eldbus_Message_Iter *values = NULL;
   Eldbus_Message_Iter *entry;
   Eina_Array *changed_properties;
   const char *error_name, *error_text;

   if (eldbus_message_error_get(msg, &error_name, &error_text))
     {
        ERR("%s: %s", error_name, error_text);
        return NULL;
     }

   if (!eldbus_message_arguments_get(msg, "a{sv}", &values))
     {
        ERR("%s", "Error getting arguments.");
        return NULL;
     }

   changed_properties = eina_array_new(1);
   while (eldbus_message_iter_get_and_next(values, 'e', &entry))
     {
        Eina_Stringshare *tmp;
        const char *property;
        Eldbus_Message_Iter *variant;
        Eina_Value *struct_value;
        Eina_Value *prop_value;
        Eina_Value arg0;
        Eina_Bool ret;

        if (!eldbus_message_iter_arguments_get(entry, "sv", &property, &variant))
          continue;

        struct_value = eldbus_message_iter_struct_like_to_eina_value(variant);
        if (!struct_value) goto on_error;

        ret = eina_value_struct_value_get(struct_value, "arg0", &arg0);
        eina_value_free(struct_value);
        if (!ret) goto on_error;

        tmp = eina_stringshare_add(property);
        prop_value = eina_hash_find(pd->properties, tmp);
        eina_stringshare_del(tmp);
        if (!prop_value) goto on_error;

        ret = eina_value_copy(&arg0, prop_value);
        if (!ret) goto on_error;

        eina_value_flush(&arg0);

        ret = eina_array_push(changed_properties, property);
        if (!ret) goto on_error;
     }

   pd->is_loaded = EINA_TRUE;
   return changed_properties;

 on_error:
   eina_array_free(changed_properties);
   return NULL;
}

static void
_eldbus_model_proxy_promise_clean(Eldbus_Property_Promise* p,
                                  Eina_Error err)
{
   if (p->promise) eina_promise_reject(p->promise, err);
   eina_stringshare_del(p->property);
   free(p);
}

static void
_eldbus_model_proxy_property_get_all_cb(void *data,
                                        const Eldbus_Message *msg,
                                        Eldbus_Pending *pending)
{
   Eldbus_Model_Proxy_Data *pd = (Eldbus_Model_Proxy_Data*)data;
   Eldbus_Property_Promise* p;
   Eina_Array *properties;
   Efl_Model_Property_Event evt;

   pd->pendings = eina_list_remove(pd->pendings, pending);

   properties = _eldbus_model_proxy_property_get_all_load(msg, pd);
   if (!properties)
     {
        EINA_LIST_FREE(pd->promises, p)
          _eldbus_model_proxy_promise_clean(p, EFL_MODEL_ERROR_NOT_FOUND);
        return ;
     }

   EINA_LIST_FREE(pd->promises, p)
     _eldbus_model_proxy_promise_clean(p, EFL_MODEL_ERROR_READ_ONLY);

   _eldbus_model_proxy_start_monitor(pd);

   evt.changed_properties = properties;
   efl_event_callback_call(pd->obj, EFL_MODEL_EVENT_PROPERTIES_CHANGED, &evt);
   eina_array_free(properties);
}


static void
_eldbus_model_proxy_property_set_load_cb(void *data,
                                         const Eldbus_Message *msg,
                                         Eldbus_Pending *pending)
{
   Eldbus_Model_Proxy_Property_Set_Data *set_data = (Eldbus_Model_Proxy_Property_Set_Data *)data;
   Eldbus_Model_Proxy_Data *pd = set_data->pd;
   Eina_Array *properties;
   const char *signature;

   pd->pendings = eina_list_remove(pd->pendings, pending);

   signature = _eldbus_model_proxy_property_type_get(pd, set_data->property);

   properties = _eldbus_model_proxy_property_get_all_load(msg, pd);
   if (!signature || !properties)
     {
        eina_promise_reject(set_data->promise, EFL_MODEL_ERROR_UNKNOWN);
        eina_array_free(properties);
        _eldbus_model_proxy_property_set_data_free(set_data);
        return;
     }

   eina_array_free(properties);
   pending = eldbus_proxy_property_value_set(pd->proxy, set_data->property,
                                             signature, set_data->value,
                                             _eldbus_model_proxy_property_set_cb, set_data);
   pd->pendings = eina_list_append(pd->pendings, pending);
}


static void
_eldbus_model_proxy_property_set_cb(void *data,
                                    const Eldbus_Message *msg,
                                    Eldbus_Pending *pending)
{
   Eldbus_Model_Proxy_Property_Set_Data *sd = (Eldbus_Model_Proxy_Property_Set_Data *)data;
   Eldbus_Model_Proxy_Data *pd = sd->pd;
   const char *error_name, *error_text;
   Eina_Value *value;

   pd->pendings = eina_list_remove(pd->pendings, pending);

   if (eldbus_message_error_get(msg, &error_name, &error_text))
     {
         ERR("%s: %s", error_name, error_text);
         eina_promise_reject(sd->promise, EFL_MODEL_ERROR_UNKNOWN);
         goto end;
     }

   value = eina_hash_find(pd->properties, sd->property);
   if (value)
     {
        efl_model_properties_changed(pd->obj, sd->property);
        if (sd->promise)
          eina_promise_resolve(sd->promise,
                               eina_value_reference_copy(value));
     }
   else
     {
        if (sd->promise)
          eina_promise_reject(sd->promise,
                              EFL_MODEL_ERROR_NOT_FOUND);
     }

 end:
   _eldbus_model_proxy_property_set_data_free(sd);
}

static const char *
_eldbus_model_proxy_property_type_get(Eldbus_Model_Proxy_Data *pd,
                                      const char *property)
{
   Eldbus_Introspection_Property *property_introspection =
     eldbus_introspection_property_find(pd->interface->properties, property);

   if (property_introspection == NULL)
     {
        WRN("Property not found: %s", property);
        return NULL;
     }

   return property_introspection->type;
}

static void
_eldbus_model_proxy_property_set_data_free(Eldbus_Model_Proxy_Property_Set_Data *data)
{
   EINA_SAFETY_ON_NULL_RETURN(data);
   eina_stringshare_del(data->property);
   eina_value_free(data->value);
   free(data);
}

#include "eldbus_model_proxy.eo.c"