/*************************************************************************/
/*  native_extension.h                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef NATIVE_EXTENSION_H
#define NATIVE_EXTENSION_H

#include "core/extension/gdnative_interface.h"
#include "core/io/resource_loader.h"
#include "core/object/ref_counted.h"

class NativeExtension : public Resource {
	GDCLASS(NativeExtension, Resource)

	void *library = nullptr; // pointer if valid,

	struct Extension {
		ObjectNativeExtension native_extension;
	};

	Map<StringName, Extension> extension_classes;

	static void _register_extension_class(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_parent_class_name, const GDNativeExtensionClassCreationInfo *p_extension_funcs);
	static void _register_extension_class_method(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const GDNativeExtensionClassMethodInfo *p_method_info);
	static void _register_extension_class_integer_constant(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_enum_name, const char *p_constant_name, GDNativeInt p_constant_value);
	static void _register_extension_class_property(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const GDNativePropertyInfo *p_info, const char *p_setter, const char *p_getter);
	static void _register_extension_class_signal(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_signal_name, const GDNativePropertyInfo *p_argument_info, GDNativeInt p_argument_count);
	static void _unregister_extension_class(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name);

	GDNativeInitialization initialization;
	int32_t level_initialized = -1;

protected:
	static void _bind_methods();

public:
	Error open_library(const String &p_path, const String &p_entry_symbol);
	void close_library();

	enum InitializationLevel {
		INITIALIZATION_LEVEL_CORE,
		INITIALIZATION_LEVEL_SERVERS,
		INITIALIZATION_LEVEL_SCENE,
		INITIALIZATION_LEVEL_EDITOR,
	};

	bool is_library_open() const;

	InitializationLevel get_minimum_library_initialization_level() const;
	void initialize_library(InitializationLevel p_level);
	void deinitialize_library(InitializationLevel p_level);

	static void initialize_native_extensions();
	NativeExtension();
	~NativeExtension();
};

VARIANT_ENUM_CAST(NativeExtension::InitializationLevel)

class NativeExtensionResourceLoader : public ResourceFormatLoader {
public:
	virtual RES load(const String &p_path, const String &p_original_path, Error *r_error, bool p_use_sub_threads = false, float *r_progress = nullptr, CacheMode p_cache_mode = CACHE_MODE_REUSE);
	virtual void get_recognized_extensions(List<String> *p_extensions) const;
	virtual bool handles_type(const String &p_type) const;
	virtual String get_resource_type(const String &p_path) const;
};

#endif // NATIVEEXTENSION_H