/*************************************************************************/
/*  project_settings.cpp                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 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 "project_settings.h"

#include "core/bind/core_bind.h"
#include "core/core_string_names.h"
#include "core/io/file_access_network.h"
#include "core/io/file_access_pack.h"
#include "core/io/marshalls.h"
#include "core/os/dir_access.h"
#include "core/os/file_access.h"
#include "core/os/keyboard.h"
#include "core/os/os.h"
#include "core/variant_parser.h"

#include <zlib.h>

ProjectSettings *ProjectSettings::singleton = NULL;

ProjectSettings *ProjectSettings::get_singleton() {

	return singleton;
}

String ProjectSettings::get_resource_path() const {

	return resource_path;
};

String ProjectSettings::localize_path(const String &p_path) const {

	if (resource_path == "")
		return p_path; //not initialized yet

	if (p_path.begins_with("res://") || p_path.begins_with("user://") ||
			(p_path.is_abs_path() && !p_path.begins_with(resource_path)))
		return p_path.simplify_path();

	DirAccess *dir = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);

	String path = p_path.replace("\\", "/").simplify_path();

	if (dir->change_dir(path) == OK) {

		String cwd = dir->get_current_dir();
		cwd = cwd.replace("\\", "/");

		memdelete(dir);

		// Ensure that we end with a '/'.
		// This is important to ensure that we do not wrongly localize the resource path
		// in an absolute path that just happens to contain this string but points to a
		// different folder (e.g. "/my/project" as resource_path would be contained in
		// "/my/project_data", even though the latter is not part of res://.
		// `plus_file("")` is an easy way to ensure we have a trailing '/'.
		const String res_path = resource_path.plus_file("");

		// DirAccess::get_current_dir() is not guaranteed to return a path that with a trailing '/',
		// so we must make sure we have it as well in order to compare with 'res_path'.
		cwd = cwd.plus_file("");

		if (!cwd.begins_with(res_path)) {
			return p_path;
		};

		return cwd.replace_first(res_path, "res://");
	} else {

		memdelete(dir);

		int sep = path.find_last("/");
		if (sep == -1) {
			return "res://" + path;
		};

		String parent = path.substr(0, sep);

		String plocal = localize_path(parent);
		if (plocal == "") {
			return "";
		};
		// Only strip the starting '/' from 'path' if its parent ('plocal') ends with '/'
		if (plocal[plocal.length() - 1] == '/') {
			sep += 1;
		}
		return plocal + path.substr(sep, path.size() - sep);
	};
}

void ProjectSettings::set_initial_value(const String &p_name, const Variant &p_value) {

	ERR_FAIL_COND_MSG(!props.has(p_name), "Request for nonexistent project setting: " + p_name + ".");
	props[p_name].initial = p_value;
}
void ProjectSettings::set_restart_if_changed(const String &p_name, bool p_restart) {

	ERR_FAIL_COND_MSG(!props.has(p_name), "Request for nonexistent project setting: " + p_name + ".");
	props[p_name].restart_if_changed = p_restart;
}

String ProjectSettings::globalize_path(const String &p_path) const {

	if (p_path.begins_with("res://")) {

		if (resource_path != "") {

			return p_path.replace("res:/", resource_path);
		};
		return p_path.replace("res://", "");
	} else if (p_path.begins_with("user://")) {

		String data_dir = OS::get_singleton()->get_user_data_dir();
		if (data_dir != "") {

			return p_path.replace("user:/", data_dir);
		};
		return p_path.replace("user://", "");
	}

	return p_path;
}

bool ProjectSettings::_set(const StringName &p_name, const Variant &p_value) {

	_THREAD_SAFE_METHOD_

	if (p_value.get_type() == Variant::NIL)
		props.erase(p_name);
	else {

		if (p_name == CoreStringNames::get_singleton()->_custom_features) {
			Vector<String> custom_feature_array = String(p_value).split(",");
			for (int i = 0; i < custom_feature_array.size(); i++) {

				custom_features.insert(custom_feature_array[i]);
			}
			return true;
		}

		if (!disable_feature_overrides) {
			int dot = p_name.operator String().find(".");
			if (dot != -1) {
				Vector<String> s = p_name.operator String().split(".");

				bool override_valid = false;
				for (int i = 1; i < s.size(); i++) {
					String feature = s[i].strip_edges();
					if (OS::get_singleton()->has_feature(feature) || custom_features.has(feature)) {
						override_valid = true;
						break;
					}
				}

				if (override_valid) {

					feature_overrides[s[0]] = p_name;
				}
			}
		}

		if (props.has(p_name)) {
			if (!props[p_name].overridden)
				props[p_name].variant = p_value;

		} else {
			props[p_name] = VariantContainer(p_value, last_order++);
		}
	}

	return true;
}
bool ProjectSettings::_get(const StringName &p_name, Variant &r_ret) const {

	_THREAD_SAFE_METHOD_

	StringName name = p_name;
	if (!disable_feature_overrides && feature_overrides.has(name)) {
		name = feature_overrides[name];
	}
	if (!props.has(name)) {
		WARN_PRINTS("Property not found: " + String(name));
		return false;
	}
	r_ret = props[name].variant;
	return true;
}

struct _VCSort {

	String name;
	Variant::Type type;
	int order;
	int flags;

	bool operator<(const _VCSort &p_vcs) const { return order == p_vcs.order ? name < p_vcs.name : order < p_vcs.order; }
};

void ProjectSettings::_get_property_list(List<PropertyInfo> *p_list) const {

	_THREAD_SAFE_METHOD_

	Set<_VCSort> vclist;

	for (Map<StringName, VariantContainer>::Element *E = props.front(); E; E = E->next()) {

		const VariantContainer *v = &E->get();

		if (v->hide_from_editor)
			continue;

		_VCSort vc;
		vc.name = E->key();
		vc.order = v->order;
		vc.type = v->variant.get_type();
		if (vc.name.begins_with("input/") || vc.name.begins_with("import/") || vc.name.begins_with("export/") || vc.name.begins_with("/remap") || vc.name.begins_with("/locale") || vc.name.begins_with("/autoload"))
			vc.flags = PROPERTY_USAGE_STORAGE;
		else
			vc.flags = PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_STORAGE;

		if (v->restart_if_changed) {
			vc.flags |= PROPERTY_USAGE_RESTART_IF_CHANGED;
		}
		vclist.insert(vc);
	}

	for (Set<_VCSort>::Element *E = vclist.front(); E; E = E->next()) {

		String prop_info_name = E->get().name;
		int dot = prop_info_name.find(".");
		if (dot != -1)
			prop_info_name = prop_info_name.substr(0, dot);

		if (custom_prop_info.has(prop_info_name)) {
			PropertyInfo pi = custom_prop_info[prop_info_name];
			pi.name = E->get().name;
			pi.usage = E->get().flags;
			p_list->push_back(pi);
		} else
			p_list->push_back(PropertyInfo(E->get().type, E->get().name, PROPERTY_HINT_NONE, "", E->get().flags));
	}
}

bool ProjectSettings::_load_resource_pack(const String &p_pack, bool p_replace_files, int p_offset) {

	if (PackedData::get_singleton()->is_disabled())
		return false;

	bool ok = PackedData::get_singleton()->add_pack(p_pack, p_replace_files, p_offset) == OK;

	if (!ok)
		return false;

	//if data.pck is found, all directory access will be from here
	DirAccess::make_default<DirAccessPack>(DirAccess::ACCESS_RESOURCES);
	using_datapack = true;

	return true;
}

void ProjectSettings::_convert_to_last_version(int p_from_version) {

	if (p_from_version <= 3) {
		// Converts the actions from array to dictionary (array of events to dictionary with deadzone + events)
		for (Map<StringName, ProjectSettings::VariantContainer>::Element *E = props.front(); E; E = E->next()) {
			Variant value = E->get().variant;
			if (String(E->key()).begins_with("input/") && value.get_type() == Variant::ARRAY) {
				Array array = value;
				Dictionary action;
				action["deadzone"] = Variant(0.5f);
				action["events"] = array;
				E->get().variant = action;
			}
		}
	}
}

/*
 * This method is responsible for loading a project.godot file and/or data file
 * using the following merit order:
 *  - If using NetworkClient, try to lookup project file or fail.
 *  - If --main-pack was passed by the user (`p_main_pack`), load it or fail.
 *  - Search for project PCKs automatically. For each step we try loading a potential
 *    PCK, and if it doesn't work, we proceed to the next step. If any step succeeds,
 *    we try loading the project settings, and abort if it fails. Steps:
 *    o Bundled PCK in the executable.
 *    o [macOS only] PCK with same basename as the binary in the .app resource dir.
 *    o PCK with same basename as the binary in the binary's directory. We handle both
 *      changing the extension to '.pck' (e.g. 'win_game.exe' -> 'win_game.pck') and
 *      appending '.pck' to the binary name (e.g. 'linux_game' -> 'linux_game.pck').
 *    o PCK with the same basename as the binary in the current working directory.
 *      Same as above for the two possible PCK file names.
 *  - On relevant platforms (Android/iOS), lookup project file in OS resource path.
 *    If found, load it or fail.
 *  - Lookup project file in passed `p_path` (--path passed by the user), i.e. we
 *    are running from source code.
 *    If not found and `p_upwards` is true (--upwards passed by the user), look for
 *    project files in parent folders up to the system root (used to run a game
 *    from command line while in a subfolder).
 *    If a project file is found, load it or fail.
 *    If nothing was found, error out.
 */
Error ProjectSettings::_setup(const String &p_path, const String &p_main_pack, bool p_upwards) {

	// If looking for files in a network client, use it directly

	if (FileAccessNetworkClient::get_singleton()) {

		Error err = _load_settings_text_or_binary("res://project.godot", "res://project.binary");
		if (err == OK) {
			// Optional, we don't mind if it fails
			_load_settings_text("res://override.cfg");
		}
		return err;
	}

	// Attempt with a user-defined main pack first

	if (p_main_pack != "") {

		bool ok = _load_resource_pack(p_main_pack);
		ERR_FAIL_COND_V_MSG(!ok, ERR_CANT_OPEN, "Cannot open resource pack '" + p_main_pack + "'.");

		Error err = _load_settings_text_or_binary("res://project.godot", "res://project.binary");
		if (err == OK) {
			// Load override from location of the main pack
			// Optional, we don't mind if it fails
			_load_settings_text(p_main_pack.get_base_dir().plus_file("override.cfg"));
		}
		return err;
	}

	String exec_path = OS::get_singleton()->get_executable_path();

	if (exec_path != "") {
		// We do several tests sequentially until one succeeds to find a PCK,
		// and if so we attempt loading it at the end.

		// Attempt with PCK bundled into executable.
		bool found = _load_resource_pack(exec_path);

		// Attempt with exec_name.pck.
		// (This is the usual case when distributing a Godot game.)
		String exec_dir = exec_path.get_base_dir();
		String exec_filename = exec_path.get_file();
		String exec_basename = exec_filename.get_basename();

		// Based on the OS, it can be the exec path + '.pck' (Linux w/o extension, macOS in .app bundle)
		// or the exec path's basename + '.pck' (Windows).
		// We need to test both possibilities as extensions for Linux binaries are optional
		// (so both 'mygame.bin' and 'mygame' should be able to find 'mygame.pck').

#ifdef OSX_ENABLED
		if (!found) {
			// Attempt to load PCK from macOS .app bundle resources.
			found = _load_resource_pack(OS::get_singleton()->get_bundle_resource_dir().plus_file(exec_basename + ".pck")) || _load_resource_pack(OS::get_singleton()->get_bundle_resource_dir().plus_file(exec_filename + ".pck"));
		}
#endif

		if (!found) {
			// Try to load data pack at the location of the executable.
			// As mentioned above, we have two potential names to attempt.
			found = _load_resource_pack(exec_dir.plus_file(exec_basename + ".pck")) || _load_resource_pack(exec_dir.plus_file(exec_filename + ".pck"));
		}

		if (!found) {
			// If we couldn't find them next to the executable, we attempt
			// the current working directory. Same story, two tests.
			found = _load_resource_pack(exec_basename + ".pck") || _load_resource_pack(exec_filename + ".pck");
		}

		// If we opened our package, try and load our project.
		if (found) {
			Error err = _load_settings_text_or_binary("res://project.godot", "res://project.binary");
			if (err == OK) {
				// Load override from location of the executable.
				// Optional, we don't mind if it fails.
				_load_settings_text(exec_path.get_base_dir().plus_file("override.cfg"));
			}
			return err;
		}
	}

	// Try to use the filesystem for files, according to OS.
	// (Only Android -when reading from pck- and iOS use this.)

	if (OS::get_singleton()->get_resource_dir() != "") {
		// OS will call ProjectSettings->get_resource_path which will be empty if not overridden!
		// If the OS would rather use a specific location, then it will not be empty.
		resource_path = OS::get_singleton()->get_resource_dir().replace("\\", "/");
		if (resource_path != "" && resource_path[resource_path.length() - 1] == '/') {
			resource_path = resource_path.substr(0, resource_path.length() - 1); // Chop end.
		}

		Error err = _load_settings_text_or_binary("res://project.godot", "res://project.binary");
		if (err == OK) {
			// Optional, we don't mind if it fails.
			_load_settings_text("res://override.cfg");
		}
		return err;
	}

	// Nothing was found, try to find a project file in provided path (`p_path`)
	// or, if requested (`p_upwards`) in parent directories.

	DirAccess *d = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
	ERR_FAIL_COND_V_MSG(!d, ERR_CANT_CREATE, "Cannot create DirAccess for path '" + p_path + "'.");
	d->change_dir(p_path);

	String current_dir = d->get_current_dir();
	String candidate = current_dir;
	bool found = false;
	Error err;

	while (true) {
		err = _load_settings_text_or_binary(current_dir.plus_file("project.godot"), current_dir.plus_file("project.binary"));
		if (err == OK) {
			// Optional, we don't mind if it fails.
			_load_settings_text(current_dir.plus_file("override.cfg"));
			candidate = current_dir;
			found = true;
			break;
		}

		if (p_upwards) {
			// Try to load settings ascending through parent directories
			d->change_dir("..");
			if (d->get_current_dir() == current_dir)
				break; // not doing anything useful
			current_dir = d->get_current_dir();
		} else {
			break;
		}
	}

	resource_path = candidate;
	resource_path = resource_path.replace("\\", "/"); // Windows path to Unix path just in case.
	memdelete(d);

	if (!found)
		return err;

	if (resource_path.length() && resource_path[resource_path.length() - 1] == '/') {
		resource_path = resource_path.substr(0, resource_path.length() - 1); // Chop end.
	}

	return OK;
}

Error ProjectSettings::setup(const String &p_path, const String &p_main_pack, bool p_upwards) {
	Error err = _setup(p_path, p_main_pack, p_upwards);
	if (err == OK) {
		String custom_settings = GLOBAL_DEF("application/config/project_settings_override", "");
		if (custom_settings != "") {
			_load_settings_text(custom_settings);
		}
	}
	// Using GLOBAL_GET on every block for compressing can be slow, so assigning here.
	Compression::zstd_long_distance_matching = GLOBAL_GET("compression/formats/zstd/long_distance_matching");
	Compression::zstd_level = GLOBAL_GET("compression/formats/zstd/compression_level");
	Compression::zstd_window_log_size = GLOBAL_GET("compression/formats/zstd/window_log_size");

	Compression::zlib_level = GLOBAL_GET("compression/formats/zlib/compression_level");

	Compression::gzip_level = GLOBAL_GET("compression/formats/gzip/compression_level");

	return err;
}

bool ProjectSettings::has_setting(String p_var) const {

	_THREAD_SAFE_METHOD_

	return props.has(p_var);
}

void ProjectSettings::set_registering_order(bool p_enable) {

	registering_order = p_enable;
}

Error ProjectSettings::_load_settings_binary(const String &p_path) {

	Error err;
	FileAccess *f = FileAccess::open(p_path, FileAccess::READ, &err);
	if (err != OK) {
		return err;
	}

	uint8_t hdr[4];
	f->get_buffer(hdr, 4);
	if (hdr[0] != 'E' || hdr[1] != 'C' || hdr[2] != 'F' || hdr[3] != 'G') {

		memdelete(f);
		ERR_FAIL_V_MSG(ERR_FILE_CORRUPT, "Corrupted header in binary project.binary (not ECFG).");
	}

	uint32_t count = f->get_32();

	for (uint32_t i = 0; i < count; i++) {

		uint32_t slen = f->get_32();
		CharString cs;
		cs.resize(slen + 1);
		cs[slen] = 0;
		f->get_buffer((uint8_t *)cs.ptr(), slen);
		String key;
		key.parse_utf8(cs.ptr());

		uint32_t vlen = f->get_32();
		Vector<uint8_t> d;
		d.resize(vlen);
		f->get_buffer(d.ptrw(), vlen);
		Variant value;
		err = decode_variant(value, d.ptr(), d.size(), NULL, true);
		ERR_CONTINUE_MSG(err != OK, "Error decoding property: " + key + ".");
		set(key, value);
	}

	f->close();
	memdelete(f);
	return OK;
}

Error ProjectSettings::_load_settings_text(const String &p_path) {

	Error err;
	FileAccess *f = FileAccess::open(p_path, FileAccess::READ, &err);

	if (!f) {
		// FIXME: Above 'err' error code is ERR_FILE_CANT_OPEN if the file is missing
		// This needs to be streamlined if we want decent error reporting
		return ERR_FILE_NOT_FOUND;
	}

	VariantParser::StreamFile stream;
	stream.f = f;

	String assign;
	Variant value;
	VariantParser::Tag next_tag;

	int lines = 0;
	String error_text;
	String section;
	int config_version = 0;

	while (true) {

		assign = Variant();
		next_tag.fields.clear();
		next_tag.name = String();

		err = VariantParser::parse_tag_assign_eof(&stream, lines, error_text, next_tag, assign, value, NULL, true);
		if (err == ERR_FILE_EOF) {
			memdelete(f);
			// If we're loading a project.godot from source code, we can operate some
			// ProjectSettings conversions if need be.
			_convert_to_last_version(config_version);
			last_save_time = FileAccess::get_modified_time(get_resource_path().plus_file("project.godot"));
			return OK;
		} else if (err != OK) {
			ERR_PRINTS("Error parsing " + p_path + " at line " + itos(lines) + ": " + error_text + " File might be corrupted.");
			memdelete(f);
			return err;
		}

		if (assign != String()) {
			if (section == String() && assign == "config_version") {
				config_version = value;
				if (config_version > CONFIG_VERSION) {
					memdelete(f);
					ERR_FAIL_V_MSG(ERR_FILE_CANT_OPEN, vformat("Can't open project at '%s', its `config_version` (%d) is from a more recent and incompatible version of the engine. Expected config version: %d.", p_path, config_version, CONFIG_VERSION));
				}
			} else {
				if (section == String()) {
					set(assign, value);
				} else {
					set(section + "/" + assign, value);
				}
			}
		} else if (next_tag.name != String()) {
			section = next_tag.name;
		}
	}
}

Error ProjectSettings::_load_settings_text_or_binary(const String &p_text_path, const String &p_bin_path) {
	// Attempt first to load the binary project.godot file.
	Error err = _load_settings_binary(p_bin_path);
	if (err == OK) {
		return OK;
	} else if (err != ERR_FILE_NOT_FOUND) {
		// If the file exists but can't be loaded, we want to know it.
		ERR_PRINT("Couldn't load file '" + p_bin_path + "', error code " + itos(err) + ".");
	}

	// Fallback to text-based project.godot file if binary was not found.
	err = _load_settings_text(p_text_path);
	if (err == OK) {
		return OK;
	} else if (err != ERR_FILE_NOT_FOUND) {
		ERR_PRINT("Couldn't load file '" + p_text_path + "', error code " + itos(err) + ".");
	}

	return err;
}

int ProjectSettings::get_order(const String &p_name) const {

	ERR_FAIL_COND_V_MSG(!props.has(p_name), -1, "Request for nonexistent project setting: " + p_name + ".");
	return props[p_name].order;
}

void ProjectSettings::set_order(const String &p_name, int p_order) {

	ERR_FAIL_COND_MSG(!props.has(p_name), "Request for nonexistent project setting: " + p_name + ".");
	props[p_name].order = p_order;
}

void ProjectSettings::set_builtin_order(const String &p_name) {

	ERR_FAIL_COND_MSG(!props.has(p_name), "Request for nonexistent project setting: " + p_name + ".");
	if (props[p_name].order >= NO_BUILTIN_ORDER_BASE) {
		props[p_name].order = last_builtin_order++;
	}
}

void ProjectSettings::clear(const String &p_name) {

	ERR_FAIL_COND_MSG(!props.has(p_name), "Request for nonexistent project setting: " + p_name + ".");
	props.erase(p_name);
}

Error ProjectSettings::save() {
	Error error = save_custom(get_resource_path().plus_file("project.godot"));
	if (error == OK) {
		last_save_time = FileAccess::get_modified_time(get_resource_path().plus_file("project.godot"));
	}
	return error;
}

Error ProjectSettings::_save_settings_binary(const String &p_file, const Map<String, List<String> > &props, const CustomMap &p_custom, const String &p_custom_features) {

	Error err;
	FileAccess *file = FileAccess::open(p_file, FileAccess::WRITE, &err);
	ERR_FAIL_COND_V_MSG(err != OK, err, "Couldn't save project.binary at " + p_file + ".");

	uint8_t hdr[4] = { 'E', 'C', 'F', 'G' };
	file->store_buffer(hdr, 4);

	int count = 0;

	for (Map<String, List<String> >::Element *E = props.front(); E; E = E->next()) {

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

			count++;
		}
	}

	if (p_custom_features != String()) {
		file->store_32(count + 1);
		//store how many properties are saved, add one for custom featuers, which must always go first
		String key = CoreStringNames::get_singleton()->_custom_features;
		file->store_32(key.length());
		file->store_string(key);

		int len;
		err = encode_variant(p_custom_features, NULL, len, false);
		if (err != OK) {
			memdelete(file);
			ERR_FAIL_V(err);
		}

		Vector<uint8_t> buff;
		buff.resize(len);

		err = encode_variant(p_custom_features, buff.ptrw(), len, false);
		if (err != OK) {
			memdelete(file);
			ERR_FAIL_V(err);
		}
		file->store_32(len);
		file->store_buffer(buff.ptr(), buff.size());

	} else {
		file->store_32(count); //store how many properties are saved
	}

	for (Map<String, List<String> >::Element *E = props.front(); E; E = E->next()) {

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

			String key = F->get();
			if (E->key() != "")
				key = E->key() + "/" + key;
			Variant value;
			if (p_custom.has(key))
				value = p_custom[key];
			else
				value = get(key);

			file->store_32(key.length());
			file->store_string(key);

			int len;
			err = encode_variant(value, NULL, len, true);
			if (err != OK)
				memdelete(file);
			ERR_FAIL_COND_V_MSG(err != OK, ERR_INVALID_DATA, "Error when trying to encode Variant.");

			Vector<uint8_t> buff;
			buff.resize(len);

			err = encode_variant(value, buff.ptrw(), len, true);
			if (err != OK)
				memdelete(file);
			ERR_FAIL_COND_V_MSG(err != OK, ERR_INVALID_DATA, "Error when trying to encode Variant.");
			file->store_32(len);
			file->store_buffer(buff.ptr(), buff.size());
		}
	}

	file->close();
	memdelete(file);

	return OK;
}

Error ProjectSettings::_save_settings_text(const String &p_file, const Map<String, List<String> > &props, const CustomMap &p_custom, const String &p_custom_features) {

	Error err;
	FileAccess *file = FileAccess::open(p_file, FileAccess::WRITE, &err);

	ERR_FAIL_COND_V_MSG(err != OK, err, "Couldn't save project.godot - " + p_file + ".");

	file->store_line("; Engine configuration file.");
	file->store_line("; It's best edited using the editor UI and not directly,");
	file->store_line("; since the parameters that go here are not all obvious.");
	file->store_line(";");
	file->store_line("; Format:");
	file->store_line(";   [section] ; section goes between []");
	file->store_line(";   param=value ; assign values to parameters");
	file->store_line("");

	file->store_string("config_version=" + itos(CONFIG_VERSION) + "\n");
	if (p_custom_features != String())
		file->store_string("custom_features=\"" + p_custom_features + "\"\n");
	file->store_string("\n");

	for (Map<String, List<String> >::Element *E = props.front(); E; E = E->next()) {

		if (E != props.front())
			file->store_string("\n");

		if (E->key() != "")
			file->store_string("[" + E->key() + "]\n\n");
		for (List<String>::Element *F = E->get().front(); F; F = F->next()) {

			String key = F->get();
			if (E->key() != "")
				key = E->key() + "/" + key;
			Variant value;
			if (p_custom.has(key))
				value = p_custom[key];
			else
				value = get(key);

			String vstr;
			VariantWriter::write_to_string(value, vstr);
			file->store_string(F->get().property_name_encode() + "=" + vstr + "\n");
		}
	}

	file->close();
	memdelete(file);

	return OK;
}

Error ProjectSettings::_save_custom_bnd(const String &p_file) { // add other params as dictionary and array?

	return save_custom(p_file);
};

Error ProjectSettings::save_custom(const String &p_path, const CustomMap &p_custom, const Vector<String> &p_custom_features, bool p_merge_with_current) {

	ERR_FAIL_COND_V_MSG(p_path == "", ERR_INVALID_PARAMETER, "Project settings save path cannot be empty.");

	Set<_VCSort> vclist;

	if (p_merge_with_current) {
		for (Map<StringName, VariantContainer>::Element *G = props.front(); G; G = G->next()) {

			const VariantContainer *v = &G->get();

			if (v->hide_from_editor)
				continue;

			if (p_custom.has(G->key()))
				continue;

			_VCSort vc;
			vc.name = G->key(); //*k;
			vc.order = v->order;
			vc.type = v->variant.get_type();
			vc.flags = PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_STORAGE;
			if (v->variant == v->initial)
				continue;

			vclist.insert(vc);
		}
	}

	for (const Map<String, Variant>::Element *E = p_custom.front(); E; E = E->next()) {

		// Lookup global prop to store in the same order
		Map<StringName, VariantContainer>::Element *global_prop = props.find(E->key());

		_VCSort vc;
		vc.name = E->key();
		vc.order = global_prop ? global_prop->get().order : 0xFFFFFFF;
		vc.type = E->get().get_type();
		vc.flags = PROPERTY_USAGE_STORAGE;
		vclist.insert(vc);
	}

	Map<String, List<String> > props;

	for (Set<_VCSort>::Element *E = vclist.front(); E; E = E->next()) {

		String category = E->get().name;
		String name = E->get().name;

		int div = category.find("/");

		if (div < 0)
			category = "";
		else {

			category = category.substr(0, div);
			name = name.substr(div + 1, name.size());
		}
		props[category].push_back(name);
	}

	String custom_features;

	for (int i = 0; i < p_custom_features.size(); i++) {
		if (i > 0)
			custom_features += ",";

		String f = p_custom_features[i].strip_edges().replace("\"", "");
		custom_features += f;
	}

	if (p_path.ends_with(".godot") || p_path.ends_with("override.cfg")) {
		return _save_settings_text(p_path, props, p_custom, custom_features);
	} else if (p_path.ends_with(".binary")) {
		return _save_settings_binary(p_path, props, p_custom, custom_features);
	} else {

		ERR_FAIL_V_MSG(ERR_FILE_UNRECOGNIZED, "Unknown config file format: " + p_path + ".");
	}
}

Variant _GLOBAL_DEF_ALIAS(const String &p_var, const String &p_old_name, const Variant &p_default, bool p_restart_if_changed) {
	// if the new name setting isn't present, try the old one
	if (!ProjectSettings::get_singleton()->has_setting(p_var)) {

		if (ProjectSettings::get_singleton()->has_setting(p_old_name)) {

			// if the old setting is present, get the value and set it in the new setting
			Variant value = ProjectSettings::get_singleton()->get(p_old_name);
			ProjectSettings::get_singleton()->set(p_var, value);
		}
	}

	return _GLOBAL_DEF(p_var, p_default, p_restart_if_changed);
}

Variant _GLOBAL_DEF(const String &p_var, const Variant &p_default, bool p_restart_if_changed) {

	Variant ret;
	if (!ProjectSettings::get_singleton()->has_setting(p_var)) {
		ProjectSettings::get_singleton()->set(p_var, p_default);
	}
	ret = ProjectSettings::get_singleton()->get(p_var);

	ProjectSettings::get_singleton()->set_initial_value(p_var, p_default);
	ProjectSettings::get_singleton()->set_builtin_order(p_var);
	ProjectSettings::get_singleton()->set_restart_if_changed(p_var, p_restart_if_changed);
	return ret;
}

Vector<String> ProjectSettings::get_optimizer_presets() const {

	List<PropertyInfo> pi;
	ProjectSettings::get_singleton()->get_property_list(&pi);
	Vector<String> names;

	for (List<PropertyInfo>::Element *E = pi.front(); E; E = E->next()) {

		if (!E->get().name.begins_with("optimizer_presets/"))
			continue;
		names.push_back(E->get().name.get_slicec('/', 1));
	}

	names.sort();

	return names;
}

void ProjectSettings::_add_property_info_bind(const Dictionary &p_info) {

	ERR_FAIL_COND(!p_info.has("name"));
	ERR_FAIL_COND(!p_info.has("type"));

	PropertyInfo pinfo;
	pinfo.name = p_info["name"];
	ERR_FAIL_COND(!props.has(pinfo.name));
	pinfo.type = Variant::Type(p_info["type"].operator int());
	ERR_FAIL_INDEX(pinfo.type, Variant::VARIANT_MAX);

	if (p_info.has("hint"))
		pinfo.hint = PropertyHint(p_info["hint"].operator int());
	if (p_info.has("hint_string"))
		pinfo.hint_string = p_info["hint_string"];

	set_custom_property_info(pinfo.name, pinfo);
}

void ProjectSettings::set_custom_property_info(const String &p_prop, const PropertyInfo &p_info) {

	ERR_FAIL_COND(!props.has(p_prop));
	custom_prop_info[p_prop] = p_info;
	custom_prop_info[p_prop].name = p_prop;
}

const Map<StringName, PropertyInfo> &ProjectSettings::get_custom_property_info() const {
	return custom_prop_info;
}

void ProjectSettings::set_disable_feature_overrides(bool p_disable) {

	disable_feature_overrides = p_disable;
}

bool ProjectSettings::is_using_datapack() const {

	return using_datapack;
}

bool ProjectSettings::property_can_revert(const String &p_name) {

	if (!props.has(p_name))
		return false;

	return props[p_name].initial != props[p_name].variant;
}

Variant ProjectSettings::property_get_revert(const String &p_name) {

	if (!props.has(p_name))
		return Variant();

	return props[p_name].initial;
}

void ProjectSettings::set_setting(const String &p_setting, const Variant &p_value) {
	set(p_setting, p_value);
}

Variant ProjectSettings::get_setting(const String &p_setting) const {
	return get(p_setting);
}

bool ProjectSettings::has_custom_feature(const String &p_feature) const {
	return custom_features.has(p_feature);
}

void ProjectSettings::_bind_methods() {

	ClassDB::bind_method(D_METHOD("has_setting", "name"), &ProjectSettings::has_setting);
	ClassDB::bind_method(D_METHOD("set_setting", "name", "value"), &ProjectSettings::set_setting);
	ClassDB::bind_method(D_METHOD("get_setting", "name"), &ProjectSettings::get_setting);
	ClassDB::bind_method(D_METHOD("set_order", "name", "position"), &ProjectSettings::set_order);
	ClassDB::bind_method(D_METHOD("get_order", "name"), &ProjectSettings::get_order);
	ClassDB::bind_method(D_METHOD("set_initial_value", "name", "value"), &ProjectSettings::set_initial_value);
	ClassDB::bind_method(D_METHOD("add_property_info", "hint"), &ProjectSettings::_add_property_info_bind);
	ClassDB::bind_method(D_METHOD("clear", "name"), &ProjectSettings::clear);
	ClassDB::bind_method(D_METHOD("localize_path", "path"), &ProjectSettings::localize_path);
	ClassDB::bind_method(D_METHOD("globalize_path", "path"), &ProjectSettings::globalize_path);
	ClassDB::bind_method(D_METHOD("save"), &ProjectSettings::save);
	ClassDB::bind_method(D_METHOD("load_resource_pack", "pack", "replace_files", "offset"), &ProjectSettings::_load_resource_pack, DEFVAL(true), DEFVAL(0));
	ClassDB::bind_method(D_METHOD("property_can_revert", "name"), &ProjectSettings::property_can_revert);
	ClassDB::bind_method(D_METHOD("property_get_revert", "name"), &ProjectSettings::property_get_revert);

	ClassDB::bind_method(D_METHOD("save_custom", "file"), &ProjectSettings::_save_custom_bnd);
}

ProjectSettings::ProjectSettings() {
	// Initialization of engine variables should be done in the setup() method,
	// so that the values can be overridden from project.godot or project.binary.

	singleton = this;
	last_order = NO_BUILTIN_ORDER_BASE;
	last_builtin_order = 0;
	disable_feature_overrides = false;
	registering_order = true;

	Array events;
	Dictionary action;
	Ref<InputEventKey> key;
	Ref<InputEventJoypadButton> joyb;

	GLOBAL_DEF("application/config/name", "");
	GLOBAL_DEF("application/config/description", "");
	custom_prop_info["application/config/description"] = PropertyInfo(Variant::STRING, "application/config/description", PROPERTY_HINT_MULTILINE_TEXT);
	GLOBAL_DEF("application/run/main_scene", "");
	custom_prop_info["application/run/main_scene"] = PropertyInfo(Variant::STRING, "application/run/main_scene", PROPERTY_HINT_FILE, "*.tscn,*.scn,*.res");
	GLOBAL_DEF("application/run/disable_stdout", false);
	GLOBAL_DEF("application/run/disable_stderr", false);
	GLOBAL_DEF("application/config/use_custom_user_dir", false);
	GLOBAL_DEF("application/config/custom_user_dir_name", "");
	GLOBAL_DEF("application/config/project_settings_override", "");
	GLOBAL_DEF("audio/default_bus_layout", "res://default_bus_layout.tres");
	custom_prop_info["audio/default_bus_layout"] = PropertyInfo(Variant::STRING, "audio/default_bus_layout", PROPERTY_HINT_FILE, "*.tres");

	PoolStringArray extensions = PoolStringArray();
	extensions.push_back("gd");
	if (Engine::get_singleton()->has_singleton("GodotSharp"))
		extensions.push_back("cs");
	extensions.push_back("shader");

	GLOBAL_DEF("editor/search_in_file_extensions", extensions);
	custom_prop_info["editor/search_in_file_extensions"] = PropertyInfo(Variant::POOL_STRING_ARRAY, "editor/search_in_file_extensions");

	GLOBAL_DEF("editor/script_templates_search_path", "res://script_templates");
	custom_prop_info["editor/script_templates_search_path"] = PropertyInfo(Variant::STRING, "editor/script_templates_search_path", PROPERTY_HINT_DIR);

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_ENTER);
	events.push_back(key);
	key.instance();
	key->set_scancode(KEY_KP_ENTER);
	events.push_back(key);
	key.instance();
	key->set_scancode(KEY_SPACE);
	events.push_back(key);
	joyb.instance();
	joyb->set_button_index(JOY_BUTTON_0);
	events.push_back(joyb);
	action["events"] = events;
	GLOBAL_DEF("input/ui_accept", action);
	input_presets.push_back("input/ui_accept");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_SPACE);
	events.push_back(key);
	joyb.instance();
	joyb->set_button_index(JOY_BUTTON_3);
	events.push_back(joyb);
	action["events"] = events;
	GLOBAL_DEF("input/ui_select", action);
	input_presets.push_back("input/ui_select");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_ESCAPE);
	events.push_back(key);
	joyb.instance();
	joyb->set_button_index(JOY_BUTTON_1);
	events.push_back(joyb);
	action["events"] = events;
	GLOBAL_DEF("input/ui_cancel", action);
	input_presets.push_back("input/ui_cancel");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_TAB);
	events.push_back(key);
	action["events"] = events;
	GLOBAL_DEF("input/ui_focus_next", action);
	input_presets.push_back("input/ui_focus_next");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_TAB);
	key->set_shift(true);
	events.push_back(key);
	action["events"] = events;
	GLOBAL_DEF("input/ui_focus_prev", action);
	input_presets.push_back("input/ui_focus_prev");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_LEFT);
	events.push_back(key);
	joyb.instance();
	joyb->set_button_index(JOY_DPAD_LEFT);
	events.push_back(joyb);
	action["events"] = events;
	GLOBAL_DEF("input/ui_left", action);
	input_presets.push_back("input/ui_left");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_RIGHT);
	events.push_back(key);
	joyb.instance();
	joyb->set_button_index(JOY_DPAD_RIGHT);
	events.push_back(joyb);
	action["events"] = events;
	GLOBAL_DEF("input/ui_right", action);
	input_presets.push_back("input/ui_right");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_UP);
	events.push_back(key);
	joyb.instance();
	joyb->set_button_index(JOY_DPAD_UP);
	events.push_back(joyb);
	action["events"] = events;
	GLOBAL_DEF("input/ui_up", action);
	input_presets.push_back("input/ui_up");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_DOWN);
	events.push_back(key);
	joyb.instance();
	joyb->set_button_index(JOY_DPAD_DOWN);
	events.push_back(joyb);
	action["events"] = events;
	GLOBAL_DEF("input/ui_down", action);
	input_presets.push_back("input/ui_down");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_PAGEUP);
	events.push_back(key);
	action["events"] = events;
	GLOBAL_DEF("input/ui_page_up", action);
	input_presets.push_back("input/ui_page_up");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_PAGEDOWN);
	events.push_back(key);
	action["events"] = events;
	GLOBAL_DEF("input/ui_page_down", action);
	input_presets.push_back("input/ui_page_down");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_HOME);
	events.push_back(key);
	action["events"] = events;
	GLOBAL_DEF("input/ui_home", action);
	input_presets.push_back("input/ui_home");

	action = Dictionary();
	action["deadzone"] = Variant(0.5f);
	events = Array();
	key.instance();
	key->set_scancode(KEY_END);
	events.push_back(key);
	action["events"] = events;
	GLOBAL_DEF("input/ui_end", action);
	input_presets.push_back("input/ui_end");

	custom_prop_info["display/window/handheld/orientation"] = PropertyInfo(Variant::STRING, "display/window/handheld/orientation", PROPERTY_HINT_ENUM, "landscape,portrait,reverse_landscape,reverse_portrait,sensor_landscape,sensor_portrait,sensor");
	custom_prop_info["rendering/threads/thread_model"] = PropertyInfo(Variant::INT, "rendering/threads/thread_model", PROPERTY_HINT_ENUM, "Single-Unsafe,Single-Safe,Multi-Threaded");
	custom_prop_info["physics/2d/thread_model"] = PropertyInfo(Variant::INT, "physics/2d/thread_model", PROPERTY_HINT_ENUM, "Single-Unsafe,Single-Safe,Multi-Threaded");
	custom_prop_info["rendering/quality/intended_usage/framebuffer_allocation"] = PropertyInfo(Variant::INT, "rendering/quality/intended_usage/framebuffer_allocation", PROPERTY_HINT_ENUM, "2D,2D Without Sampling,3D,3D Without Effects");

	GLOBAL_DEF("debug/settings/profiler/max_functions", 16384);
	custom_prop_info["debug/settings/profiler/max_functions"] = PropertyInfo(Variant::INT, "debug/settings/profiler/max_functions", PROPERTY_HINT_RANGE, "128,65535,1");

	GLOBAL_DEF("compression/formats/zstd/long_distance_matching", Compression::zstd_long_distance_matching);
	custom_prop_info["compression/formats/zstd/long_distance_matching"] = PropertyInfo(Variant::BOOL, "compression/formats/zstd/long_distance_matching");
	GLOBAL_DEF("compression/formats/zstd/compression_level", Compression::zstd_level);
	custom_prop_info["compression/formats/zstd/compression_level"] = PropertyInfo(Variant::INT, "compression/formats/zstd/compression_level", PROPERTY_HINT_RANGE, "1,22,1");
	GLOBAL_DEF("compression/formats/zstd/window_log_size", Compression::zstd_window_log_size);
	custom_prop_info["compression/formats/zstd/window_log_size"] = PropertyInfo(Variant::INT, "compression/formats/zstd/window_log_size", PROPERTY_HINT_RANGE, "10,30,1");

	GLOBAL_DEF("compression/formats/zlib/compression_level", Compression::zlib_level);
	custom_prop_info["compression/formats/zlib/compression_level"] = PropertyInfo(Variant::INT, "compression/formats/zlib/compression_level", PROPERTY_HINT_RANGE, "-1,9,1");

	GLOBAL_DEF("compression/formats/gzip/compression_level", Compression::gzip_level);
	custom_prop_info["compression/formats/gzip/compression_level"] = PropertyInfo(Variant::INT, "compression/formats/gzip/compression_level", PROPERTY_HINT_RANGE, "-1,9,1");

	// Would ideally be defined in an Android-specific file, but then it doesn't appear in the docs
	GLOBAL_DEF("android/modules", "");

	using_datapack = false;
}

ProjectSettings::~ProjectSettings() {

	singleton = NULL;
}
