/*************************************************************************/
/*  register_types.cpp                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#include "register_types.h"

#include "gdnative/gdnative.h"

#include "gdnative.h"

#include "nativescript/register_types.h"
#include "net/register_types.h"
#include "pluginscript/register_types.h"
#include "videodecoder/register_types.h"
#include "xr/register_types.h"

#include "core/engine.h"
#include "core/io/resource_loader.h"
#include "core/io/resource_saver.h"
#include "core/os/os.h"
#include "core/project_settings.h"

#ifdef TOOLS_ENABLED
#include "editor/editor_export.h"
#include "editor/editor_node.h"
#include "gdnative_library_editor_plugin.h"
#include "gdnative_library_singleton_editor.h"

class GDNativeExportPlugin : public EditorExportPlugin {
protected:
	virtual void _export_file(const String &p_path, const String &p_type, const Set<String> &p_features);
};

struct LibrarySymbol {
	const char *name;
	bool is_required;
};

void GDNativeExportPlugin::_export_file(const String &p_path, const String &p_type, const Set<String> &p_features) {
	if (p_type != "GDNativeLibrary") {
		return;
	}

	Ref<GDNativeLibrary> lib = ResourceLoader::load(p_path);

	if (lib.is_null()) {
		return;
	}

	Ref<ConfigFile> config = lib->get_config_file();

	{
		List<String> entry_keys;
		config->get_section_keys("entry", &entry_keys);

		for (List<String>::Element *E = entry_keys.front(); E; E = E->next()) {
			String key = E->get();

			Vector<String> tags = key.split(".");

			bool skip = false;
			for (int i = 0; i < tags.size(); i++) {
				bool has_feature = p_features.has(tags[i]);

				if (!has_feature) {
					skip = true;
					break;
				}
			}

			if (skip) {
				continue;
			}

			String entry_lib_path = config->get_value("entry", key);
			if (!entry_lib_path.begins_with("res://")) {
				print_line("Skipping export of out-of-project library " + entry_lib_path);
				continue;
			}

			add_shared_object(entry_lib_path, tags);
		}
	}

	{
		List<String> dependency_keys;
		config->get_section_keys("dependencies", &dependency_keys);

		for (List<String>::Element *E = dependency_keys.front(); E; E = E->next()) {
			String key = E->get();

			Vector<String> tags = key.split(".");

			bool skip = false;
			for (int i = 0; i < tags.size(); i++) {
				bool has_feature = p_features.has(tags[i]);

				if (!has_feature) {
					skip = true;
					break;
				}
			}

			if (skip) {
				continue;
			}

			Vector<String> dependency_paths = config->get_value("dependencies", key);
			for (int i = 0; i < dependency_paths.size(); i++) {
				if (!dependency_paths[i].begins_with("res://")) {
					print_line("Skipping export of out-of-project library " + dependency_paths[i]);
					continue;
				}
				add_shared_object(dependency_paths[i], tags);
			}
		}
	}

	// Add symbols for staticaly linked libraries on iOS
	if (p_features.has("iOS")) {
		bool should_fake_dynamic = false;

		List<String> entry_keys;
		config->get_section_keys("entry", &entry_keys);

		for (List<String>::Element *E = entry_keys.front(); E; E = E->next()) {
			String key = E->get();

			Vector<String> tags = key.split(".");

			bool skip = false;
			for (int i = 0; i < tags.size(); i++) {
				bool has_feature = p_features.has(tags[i]);

				if (!has_feature) {
					skip = true;
					break;
				}
			}

			if (skip) {
				continue;
			}

			String entry_lib_path = config->get_value("entry", key);
			if (entry_lib_path.begins_with("res://") && entry_lib_path.ends_with(".a")) {
				// If we find static library that was used for export
				// we should add a fake lookup table.
				// In case of dynamic library being used,
				// this symbols will not cause any issues with library loading.
				should_fake_dynamic = true;
				break;
			}
		}

		if (should_fake_dynamic) {
			// Register symbols in the "fake" dynamic lookup table, because dlsym does not work well on iOS.
			LibrarySymbol expected_symbols[] = {
				{ "gdnative_init", true },
				{ "gdnative_terminate", false },
				{ "nativescript_init", false },
				{ "nativescript_frame", false },
				{ "nativescript_thread_enter", false },
				{ "nativescript_thread_exit", false },
				{ "gdnative_singleton", false }
			};
			String declare_pattern = "extern \"C\" void $name(void)$weak;\n";
			String additional_code = "extern void register_dynamic_symbol(char *name, void *address);\n"
									 "extern void add_ios_init_callback(void (*cb)());\n";
			String linker_flags = "";
			for (unsigned long i = 0; i < sizeof(expected_symbols) / sizeof(expected_symbols[0]); ++i) {
				String full_name = lib->get_symbol_prefix() + expected_symbols[i].name;
				String code = declare_pattern.replace("$name", full_name);
				code = code.replace("$weak", expected_symbols[i].is_required ? "" : " __attribute__((weak))");
				additional_code += code;

				if (!expected_symbols[i].is_required) {
					if (linker_flags.length() > 0) {
						linker_flags += " ";
					}
					linker_flags += "-Wl,-U,_" + full_name;
				}
			}

			additional_code += String("void $prefixinit() {\n").replace("$prefix", lib->get_symbol_prefix());
			String register_pattern = "  if (&$name) register_dynamic_symbol((char *)\"$name\", (void *)$name);\n";
			for (unsigned long i = 0; i < sizeof(expected_symbols) / sizeof(expected_symbols[0]); ++i) {
				String full_name = lib->get_symbol_prefix() + expected_symbols[i].name;
				additional_code += register_pattern.replace("$name", full_name);
			}
			additional_code += "}\n";
			additional_code += String("struct $prefixstruct {$prefixstruct() {add_ios_init_callback($prefixinit);}};\n").replace("$prefix", lib->get_symbol_prefix());
			additional_code += String("$prefixstruct $prefixstruct_instance;\n").replace("$prefix", lib->get_symbol_prefix());

			add_ios_cpp_code(additional_code);
			add_ios_linker_flags(linker_flags);
		}
	}
}

static void editor_init_callback() {
	GDNativeLibrarySingletonEditor *library_editor = memnew(GDNativeLibrarySingletonEditor);
	library_editor->set_name(TTR("GDNative"));
	ProjectSettingsEditor::get_singleton()->get_tabs()->add_child(library_editor);

	Ref<GDNativeExportPlugin> export_plugin;
	export_plugin.instance();

	EditorExport::get_singleton()->add_export_plugin(export_plugin);

	EditorNode::get_singleton()->add_editor_plugin(memnew(GDNativeLibraryEditorPlugin(EditorNode::get_singleton())));
}

#endif

static godot_variant cb_standard_varcall(void *p_procedure_handle, godot_array *p_args) {
	godot_gdnative_procedure_fn proc;
	proc = (godot_gdnative_procedure_fn)p_procedure_handle;

	return proc(p_args);
}

GDNativeCallRegistry *GDNativeCallRegistry::singleton;

Vector<Ref<GDNative>> singleton_gdnatives;

Ref<GDNativeLibraryResourceLoader> resource_loader_gdnlib;
Ref<GDNativeLibraryResourceSaver> resource_saver_gdnlib;

void register_gdnative_types() {
#ifdef TOOLS_ENABLED

	EditorNode::add_init_callback(editor_init_callback);
#endif

	ClassDB::register_class<GDNativeLibrary>();
	ClassDB::register_class<GDNative>();

	resource_loader_gdnlib.instance();
	ResourceLoader::add_resource_format_loader(resource_loader_gdnlib);

	resource_saver_gdnlib.instance();
	ResourceSaver::add_resource_format_saver(resource_saver_gdnlib);

	GDNativeCallRegistry::singleton = memnew(GDNativeCallRegistry);

	GDNativeCallRegistry::singleton->register_native_call_type("standard_varcall", cb_standard_varcall);

	register_net_types();
	register_xr_types();
	register_nativescript_types();
	register_pluginscript_types();
	register_videodecoder_types();

	// run singletons

	Array singletons = Array();
	if (ProjectSettings::get_singleton()->has_setting("gdnative/singletons")) {
		singletons = ProjectSettings::get_singleton()->get("gdnative/singletons");
	}
	Array excluded = Array();
	if (ProjectSettings::get_singleton()->has_setting("gdnative/singletons_disabled")) {
		excluded = ProjectSettings::get_singleton()->get("gdnative/singletons_disabled");
	}

	for (int i = 0; i < singletons.size(); i++) {
		String path = singletons[i];

		if (excluded.has(path)) {
			continue;
		}

		Ref<GDNativeLibrary> lib = ResourceLoader::load(path);
		Ref<GDNative> singleton;
		singleton.instance();
		singleton->set_library(lib);

		if (!singleton->initialize()) {
			// Can't initialize. Don't make a native_call then
			continue;
		}

		void *proc_ptr;
		Error err = singleton->get_symbol(
				lib->get_symbol_prefix() + "gdnative_singleton",
				proc_ptr);

		if (err != OK) {
			ERR_PRINT("No " + lib->get_symbol_prefix() + "gdnative_singleton in \"" + singleton->get_library()->get_current_library_path() + "\" found");
		} else {
			singleton_gdnatives.push_back(singleton);
			((void (*)())proc_ptr)();
		}
	}
}

void unregister_gdnative_types() {
	for (int i = 0; i < singleton_gdnatives.size(); i++) {
		if (singleton_gdnatives[i].is_null()) {
			continue;
		}

		if (!singleton_gdnatives[i]->is_initialized()) {
			continue;
		}

		singleton_gdnatives.write[i]->terminate();
	}
	singleton_gdnatives.clear();

	unregister_videodecoder_types();
	unregister_pluginscript_types();
	unregister_nativescript_types();
	unregister_xr_types();
	unregister_net_types();

	memdelete(GDNativeCallRegistry::singleton);

	ResourceLoader::remove_resource_format_loader(resource_loader_gdnlib);
	resource_loader_gdnlib.unref();

	ResourceSaver::remove_resource_format_saver(resource_saver_gdnlib);
	resource_saver_gdnlib.unref();

	// This is for printing out the sizes of the core types

	/*
	print_line(String("array:\t")     + itos(sizeof(Array)));
	print_line(String("basis:\t")     + itos(sizeof(Basis)));
	print_line(String("color:\t")     + itos(sizeof(Color)));
	print_line(String("dict:\t" )     + itos(sizeof(Dictionary)));
	print_line(String("node_path:\t") + itos(sizeof(NodePath)));
	print_line(String("plane:\t")     + itos(sizeof(Plane)));
	print_line(String("poolarray:\t") + itos(sizeof(PackedByteArray)));
	print_line(String("quat:\t")      + itos(sizeof(Quat)));
	print_line(String("rect2:\t")     + itos(sizeof(Rect2)));
	print_line(String("aabb:\t")     + itos(sizeof(AABB)));
	print_line(String("rid:\t")       + itos(sizeof(RID)));
	print_line(String("string:\t")    + itos(sizeof(String)));
	print_line(String("transform:\t") + itos(sizeof(Transform)));
	print_line(String("transfo2D:\t") + itos(sizeof(Transform2D)));
	print_line(String("variant:\t")   + itos(sizeof(Variant)));
	print_line(String("vector2:\t")   + itos(sizeof(Vector2)));
	print_line(String("vector3:\t")   + itos(sizeof(Vector3)));
	*/
}
