/*************************************************************************/
/*  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"

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

bool ScriptServer::scripting_enabled = true;
bool ScriptServer::reload_scripts_on_save = false;

void Script::_notification(int p_what) {

	if (p_what == NOTIFICATION_POSTINITIALIZE) {

		if (ScriptDebugger::get_singleton())
			ScriptDebugger::get_singleton()->set_break_language(get_language());
	}
}

void Script::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("can_instance"), &Script::can_instance);
	//ObjectTypeDB::bind_method(_MD("instance_create","base_object"),&Script::instance_create);
	ObjectTypeDB::bind_method(_MD("instance_has", "base_object"), &Script::instance_has);
	ObjectTypeDB::bind_method(_MD("has_source_code"), &Script::has_source_code);
	ObjectTypeDB::bind_method(_MD("get_source_code"), &Script::get_source_code);
	ObjectTypeDB::bind_method(_MD("set_source_code", "source"), &Script::set_source_code);
	ObjectTypeDB::bind_method(_MD("reload", "keep_state"), &Script::reload, DEFVAL(false));
}

void ScriptServer::set_scripting_enabled(bool p_enabled) {

	scripting_enabled = p_enabled;
}

bool ScriptServer::is_scripting_enabled() {

	return scripting_enabled;
}

int ScriptServer::get_language_count() {

	return _language_count;
}

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() {

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

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();
	}
}

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++;
	}

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

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

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++;
	}

	Variant::CallError error;
	call_multilevel(p_method, argptr, argc);
}

ScriptInstance::~ScriptInstance() {
}

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

void ScriptLanguage::frame() {
}

ScriptDebugger *ScriptDebugger::singleton = NULL;

void ScriptDebugger::set_lines_left(int p_left) {

	lines_left = p_left;
}

int ScriptDebugger::get_lines_left() const {

	return lines_left;
}

void ScriptDebugger::set_depth(int p_depth) {

	depth = p_depth;
}

int ScriptDebugger::get_depth() const {

	return depth;
}

void ScriptDebugger::insert_breakpoint(int p_line, const StringName &p_source) {

	if (!breakpoints.has(p_line))
		breakpoints[p_line] = Set<StringName>();
	breakpoints[p_line].insert(p_source);
}

void ScriptDebugger::remove_breakpoint(int p_line, const StringName &p_source) {

	if (!breakpoints.has(p_line))
		return;

	breakpoints[p_line].erase(p_source);
	if (breakpoints[p_line].size() == 0)
		breakpoints.erase(p_line);
}
bool ScriptDebugger::is_breakpoint(int p_line, const StringName &p_source) const {

	if (!breakpoints.has(p_line))
		return false;
	return breakpoints[p_line].has(p_source);
}
bool ScriptDebugger::is_breakpoint_line(int p_line) const {

	return breakpoints.has(p_line);
}

String ScriptDebugger::breakpoint_find_source(const String &p_source) const {

	return p_source;
}

void ScriptDebugger::clear_breakpoints() {

	breakpoints.clear();
}

void ScriptDebugger::idle_poll() {
}

void ScriptDebugger::line_poll() {
}

void ScriptDebugger::set_break_language(ScriptLanguage *p_lang) {

	break_lang = p_lang;
}

ScriptLanguage *ScriptDebugger::get_break_language() const {

	return break_lang;
}

ScriptDebugger::ScriptDebugger() {

	singleton = this;
	lines_left = -1;
	depth = -1;
	break_lang = NULL;
}

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

	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;
	}

	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 {

	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 (r_is_valid)
		*r_is_valid = false;

	return Variant::NIL;
}

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
}

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

	language = p_language;
	script = p_script;
	owner = p_owner;
}

PlaceHolderScriptInstance::~PlaceHolderScriptInstance() {

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