/*************************************************************************/
/*  script_language.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 "script_language.h"

#include "core/core_string_names.h"
#include "core/debugger/engine_debugger.h"
#include "core/debugger/script_debugger.h"
#include "core/project_settings.h"
#include <stdint.h>

ScriptLanguage *ScriptServer::_languages[MAX_LANGUAGES];
int ScriptServer::_language_count = 0;

bool ScriptServer::scripting_enabled = true;
bool ScriptServer::reload_scripts_on_save = false;
bool ScriptServer::languages_finished = false;
ScriptEditRequestFunction ScriptServer::edit_request_func = NULL;

void Script::_notification(int p_what) {

	if (p_what == NOTIFICATION_POSTINITIALIZE) {

		if (EngineDebugger::is_active())
			EngineDebugger::get_script_debugger()->set_break_language(get_language());
	}
}

Variant Script::_get_property_default_value(const StringName &p_property) {
	Variant ret;
	get_property_default_value(p_property, ret);
	return ret;
}

Array Script::_get_script_property_list() {
	Array ret;
	List<PropertyInfo> list;
	get_script_property_list(&list);
	for (List<PropertyInfo>::Element *E = list.front(); E; E = E->next()) {
		ret.append(E->get().operator Dictionary());
	}
	return ret;
}

Array Script::_get_script_method_list() {
	Array ret;
	List<MethodInfo> list;
	get_script_method_list(&list);
	for (List<MethodInfo>::Element *E = list.front(); E; E = E->next()) {
		ret.append(E->get().operator Dictionary());
	}
	return ret;
}

Array Script::_get_script_signal_list() {
	Array ret;
	List<MethodInfo> list;
	get_script_signal_list(&list);
	for (List<MethodInfo>::Element *E = list.front(); E; E = E->next()) {
		ret.append(E->get().operator Dictionary());
	}
	return ret;
}

Dictionary Script::_get_script_constant_map() {
	Dictionary ret;
	Map<StringName, Variant> map;
	get_constants(&map);
	for (Map<StringName, Variant>::Element *E = map.front(); E; E = E->next()) {
		ret[E->key()] = E->value();
	}
	return ret;
}

void Script::_bind_methods() {

	ClassDB::bind_method(D_METHOD("can_instance"), &Script::can_instance);
	//ClassDB::bind_method(D_METHOD("instance_create","base_object"),&Script::instance_create);
	ClassDB::bind_method(D_METHOD("instance_has", "base_object"), &Script::instance_has);
	ClassDB::bind_method(D_METHOD("has_source_code"), &Script::has_source_code);
	ClassDB::bind_method(D_METHOD("get_source_code"), &Script::get_source_code);
	ClassDB::bind_method(D_METHOD("set_source_code", "source"), &Script::set_source_code);
	ClassDB::bind_method(D_METHOD("reload", "keep_state"), &Script::reload, DEFVAL(false));
	ClassDB::bind_method(D_METHOD("get_base_script"), &Script::get_base_script);
	ClassDB::bind_method(D_METHOD("get_instance_base_type"), &Script::get_instance_base_type);

	ClassDB::bind_method(D_METHOD("has_script_signal", "signal_name"), &Script::has_script_signal);

	ClassDB::bind_method(D_METHOD("get_script_property_list"), &Script::_get_script_property_list);
	ClassDB::bind_method(D_METHOD("get_script_method_list"), &Script::_get_script_method_list);
	ClassDB::bind_method(D_METHOD("get_script_signal_list"), &Script::_get_script_signal_list);
	ClassDB::bind_method(D_METHOD("get_script_constant_map"), &Script::_get_script_constant_map);
	ClassDB::bind_method(D_METHOD("get_property_default_value", "property"), &Script::_get_property_default_value);

	ClassDB::bind_method(D_METHOD("is_tool"), &Script::is_tool);

	ADD_PROPERTY(PropertyInfo(Variant::STRING, "source_code", PROPERTY_HINT_NONE, "", 0), "set_source_code", "get_source_code");
}

void ScriptServer::set_scripting_enabled(bool p_enabled) {

	scripting_enabled = p_enabled;
}

bool ScriptServer::is_scripting_enabled() {

	return scripting_enabled;
}

ScriptLanguage *ScriptServer::get_language(int p_idx) {

	ERR_FAIL_INDEX_V(p_idx, _language_count, NULL);

	return _languages[p_idx];
}

void ScriptServer::register_language(ScriptLanguage *p_language) {

	ERR_FAIL_COND(_language_count >= MAX_LANGUAGES);
	_languages[_language_count++] = p_language;
}

void ScriptServer::unregister_language(ScriptLanguage *p_language) {

	for (int i = 0; i < _language_count; i++) {
		if (_languages[i] == p_language) {
			_language_count--;
			if (i < _language_count) {
				SWAP(_languages[i], _languages[_language_count]);
			}
			return;
		}
	}
}

void ScriptServer::init_languages() {

	{ //load global classes
		global_classes_clear();
		if (ProjectSettings::get_singleton()->has_setting("_global_script_classes")) {
			Array script_classes = ProjectSettings::get_singleton()->get("_global_script_classes");

			for (int i = 0; i < script_classes.size(); i++) {
				Dictionary c = script_classes[i];
				if (!c.has("class") || !c.has("language") || !c.has("path") || !c.has("base"))
					continue;
				add_global_class(c["class"], c["base"], c["language"], c["path"]);
			}
		}
	}

	for (int i = 0; i < _language_count; i++) {
		_languages[i]->init();
	}
}

void ScriptServer::finish_languages() {

	for (int i = 0; i < _language_count; i++) {
		_languages[i]->finish();
	}
	global_classes_clear();
	languages_finished = true;
}

void ScriptServer::set_reload_scripts_on_save(bool p_enable) {

	reload_scripts_on_save = p_enable;
}

bool ScriptServer::is_reload_scripts_on_save_enabled() {

	return reload_scripts_on_save;
}

void ScriptServer::thread_enter() {

	for (int i = 0; i < _language_count; i++) {
		_languages[i]->thread_enter();
	}
}

void ScriptServer::thread_exit() {

	for (int i = 0; i < _language_count; i++) {
		_languages[i]->thread_exit();
	}
}

HashMap<StringName, ScriptServer::GlobalScriptClass> ScriptServer::global_classes;

void ScriptServer::global_classes_clear() {
	global_classes.clear();
}

void ScriptServer::add_global_class(const StringName &p_class, const StringName &p_base, const StringName &p_language, const String &p_path) {
	ERR_FAIL_COND_MSG(p_class == p_base || (global_classes.has(p_base) && get_global_class_native_base(p_base) == p_class), "Cyclic inheritance in script class.");
	GlobalScriptClass g;
	g.language = p_language;
	g.path = p_path;
	g.base = p_base;
	global_classes[p_class] = g;
}
void ScriptServer::remove_global_class(const StringName &p_class) {
	global_classes.erase(p_class);
}
bool ScriptServer::is_global_class(const StringName &p_class) {
	return global_classes.has(p_class);
}
StringName ScriptServer::get_global_class_language(const StringName &p_class) {
	ERR_FAIL_COND_V(!global_classes.has(p_class), StringName());
	return global_classes[p_class].language;
}
String ScriptServer::get_global_class_path(const String &p_class) {
	ERR_FAIL_COND_V(!global_classes.has(p_class), String());
	return global_classes[p_class].path;
}

StringName ScriptServer::get_global_class_base(const String &p_class) {
	ERR_FAIL_COND_V(!global_classes.has(p_class), String());
	return global_classes[p_class].base;
}
StringName ScriptServer::get_global_class_native_base(const String &p_class) {
	ERR_FAIL_COND_V(!global_classes.has(p_class), String());
	String base = global_classes[p_class].base;
	while (global_classes.has(base)) {
		base = global_classes[base].base;
	}
	return base;
}
void ScriptServer::get_global_class_list(List<StringName> *r_global_classes) {
	const StringName *K = NULL;
	List<StringName> classes;
	while ((K = global_classes.next(K))) {
		classes.push_back(*K);
	}
	classes.sort_custom<StringName::AlphCompare>();
	for (List<StringName>::Element *E = classes.front(); E; E = E->next()) {
		r_global_classes->push_back(E->get());
	}
}
void ScriptServer::save_global_classes() {
	List<StringName> gc;
	get_global_class_list(&gc);
	Array gcarr;
	for (List<StringName>::Element *E = gc.front(); E; E = E->next()) {
		Dictionary d;
		d["class"] = E->get();
		d["language"] = global_classes[E->get()].language;
		d["path"] = global_classes[E->get()].path;
		d["base"] = global_classes[E->get()].base;
		gcarr.push_back(d);
	}

	ProjectSettings::get_singleton()->set("_global_script_classes", gcarr);
	ProjectSettings::get_singleton()->save();
}

////////////////////
void ScriptInstance::get_property_state(List<Pair<StringName, Variant> > &state) {

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

		if (E->get().usage & PROPERTY_USAGE_STORAGE) {
			Pair<StringName, Variant> p;
			p.first = E->get().name;
			if (get(p.first, p.second))
				state.push_back(p);
		}
	}
}

Variant ScriptInstance::call(const StringName &p_method, VARIANT_ARG_DECLARE) {

	VARIANT_ARGPTRS;
	int argc = 0;
	for (int i = 0; i < VARIANT_ARG_MAX; i++) {
		if (argptr[i]->get_type() == Variant::NIL)
			break;
		argc++;
	}

	Callable::CallError error;
	return call(p_method, argptr, argc, error);
}

void ScriptInstance::call_multilevel(const StringName &p_method, const Variant **p_args, int p_argcount) {
	Callable::CallError ce;
	call(p_method, p_args, p_argcount, ce); // script may not support multilevel calls
}

void ScriptInstance::call_multilevel_reversed(const StringName &p_method, const Variant **p_args, int p_argcount) {
	Callable::CallError ce;
	call(p_method, p_args, p_argcount, ce); // script may not support multilevel calls
}

void ScriptInstance::property_set_fallback(const StringName &, const Variant &, bool *r_valid) {
	if (r_valid)
		*r_valid = false;
}

Variant ScriptInstance::property_get_fallback(const StringName &, bool *r_valid) {
	if (r_valid)
		*r_valid = false;
	return Variant();
}

void ScriptInstance::call_multilevel(const StringName &p_method, VARIANT_ARG_DECLARE) {

	VARIANT_ARGPTRS;
	int argc = 0;
	for (int i = 0; i < VARIANT_ARG_MAX; i++) {
		if (argptr[i]->get_type() == Variant::NIL)
			break;
		argc++;
	}

	call_multilevel(p_method, argptr, argc);
}

ScriptInstance::~ScriptInstance() {
}

ScriptCodeCompletionCache *ScriptCodeCompletionCache::singleton = NULL;
ScriptCodeCompletionCache::ScriptCodeCompletionCache() {
	singleton = this;
}

void ScriptLanguage::frame() {
}

bool PlaceHolderScriptInstance::set(const StringName &p_name, const Variant &p_value) {

	if (script->is_placeholder_fallback_enabled())
		return false;

	if (values.has(p_name)) {
		Variant defval;
		if (script->get_property_default_value(p_name, defval)) {
			if (defval == p_value) {
				values.erase(p_name);
				return true;
			}
		}
		values[p_name] = p_value;
		return true;
	} else {
		Variant defval;
		if (script->get_property_default_value(p_name, defval)) {
			if (defval != p_value) {
				values[p_name] = p_value;
			}
			return true;
		}
	}
	return false;
}
bool PlaceHolderScriptInstance::get(const StringName &p_name, Variant &r_ret) const {

	if (values.has(p_name)) {
		r_ret = values[p_name];
		return true;
	}

	if (constants.has(p_name)) {
		r_ret = constants[p_name];
		return true;
	}

	if (!script->is_placeholder_fallback_enabled()) {
		Variant defval;
		if (script->get_property_default_value(p_name, defval)) {
			r_ret = defval;
			return true;
		}
	}

	return false;
}

void PlaceHolderScriptInstance::get_property_list(List<PropertyInfo> *p_properties) const {

	if (script->is_placeholder_fallback_enabled()) {
		for (const List<PropertyInfo>::Element *E = properties.front(); E; E = E->next()) {
			p_properties->push_back(E->get());
		}
	} else {
		for (const List<PropertyInfo>::Element *E = properties.front(); E; E = E->next()) {
			PropertyInfo pinfo = E->get();
			if (!values.has(pinfo.name)) {
				pinfo.usage |= PROPERTY_USAGE_SCRIPT_DEFAULT_VALUE;
			}
			p_properties->push_back(E->get());
		}
	}
}

Variant::Type PlaceHolderScriptInstance::get_property_type(const StringName &p_name, bool *r_is_valid) const {

	if (values.has(p_name)) {
		if (r_is_valid)
			*r_is_valid = true;
		return values[p_name].get_type();
	}

	if (constants.has(p_name)) {
		if (r_is_valid)
			*r_is_valid = true;
		return constants[p_name].get_type();
	}

	if (r_is_valid)
		*r_is_valid = false;

	return Variant::NIL;
}

void PlaceHolderScriptInstance::get_method_list(List<MethodInfo> *p_list) const {

	if (script->is_placeholder_fallback_enabled())
		return;

	if (script.is_valid()) {
		script->get_script_method_list(p_list);
	}
}
bool PlaceHolderScriptInstance::has_method(const StringName &p_method) const {

	if (script->is_placeholder_fallback_enabled())
		return false;

	if (script.is_valid()) {
		return script->has_method(p_method);
	}
	return false;
}

void PlaceHolderScriptInstance::update(const List<PropertyInfo> &p_properties, const Map<StringName, Variant> &p_values) {

	Set<StringName> new_values;
	for (const List<PropertyInfo>::Element *E = p_properties.front(); E; E = E->next()) {

		StringName n = E->get().name;
		new_values.insert(n);

		if (!values.has(n) || values[n].get_type() != E->get().type) {

			if (p_values.has(n))
				values[n] = p_values[n];
		}
	}

	properties = p_properties;
	List<StringName> to_remove;

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

		if (!new_values.has(E->key()))
			to_remove.push_back(E->key());

		Variant defval;
		if (script->get_property_default_value(E->key(), defval)) {
			//remove because it's the same as the default value
			if (defval == E->get()) {
				to_remove.push_back(E->key());
			}
		}
	}

	while (to_remove.size()) {

		values.erase(to_remove.front()->get());
		to_remove.pop_front();
	}

	if (owner && owner->get_script_instance() == this) {

		owner->_change_notify();
	}
	//change notify

	constants.clear();
	script->get_constants(&constants);
}

void PlaceHolderScriptInstance::property_set_fallback(const StringName &p_name, const Variant &p_value, bool *r_valid) {

	if (script->is_placeholder_fallback_enabled()) {
		Map<StringName, Variant>::Element *E = values.find(p_name);

		if (E) {
			E->value() = p_value;
		} else {
			values.insert(p_name, p_value);
		}

		bool found = false;
		for (const List<PropertyInfo>::Element *F = properties.front(); F; F = F->next()) {
			if (F->get().name == p_name) {
				found = true;
				break;
			}
		}
		if (!found) {
			properties.push_back(PropertyInfo(p_value.get_type(), p_name, PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_SCRIPT_VARIABLE));
		}
	}

	if (r_valid)
		*r_valid = false; // Cannot change the value in either case
}

Variant PlaceHolderScriptInstance::property_get_fallback(const StringName &p_name, bool *r_valid) {

	if (script->is_placeholder_fallback_enabled()) {
		const Map<StringName, Variant>::Element *E = values.find(p_name);

		if (E) {
			if (r_valid)
				*r_valid = true;
			return E->value();
		}

		E = constants.find(p_name);
		if (E) {
			if (r_valid)
				*r_valid = true;
			return E->value();
		}
	}

	if (r_valid)
		*r_valid = false;

	return Variant();
}

uint16_t PlaceHolderScriptInstance::get_rpc_method_id(const StringName &p_method) const {
	return UINT16_MAX;
}

uint16_t PlaceHolderScriptInstance::get_rset_property_id(const StringName &p_method) const {
	return UINT16_MAX;
}

PlaceHolderScriptInstance::PlaceHolderScriptInstance(ScriptLanguage *p_language, Ref<Script> p_script, Object *p_owner) :
		owner(p_owner),
		language(p_language),
		script(p_script) {
}

PlaceHolderScriptInstance::~PlaceHolderScriptInstance() {

	if (script.is_valid()) {
		script->_placeholder_erased(this);
	}
}