/*************************************************************************/
/*  visual_script_yield_nodes.cpp                                        */
/*************************************************************************/
/*                       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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#include "visual_script_yield_nodes.h"

#include "core/os/os.h"
#include "scene/main/node.h"
#include "scene/main/scene_tree.h"
#include "visual_script_nodes.h"

//////////////////////////////////////////
////////////////YIELD///////////
//////////////////////////////////////////

int VisualScriptYield::get_output_sequence_port_count() const {

	return 1;
}

bool VisualScriptYield::has_input_sequence_port() const {

	return true;
}

int VisualScriptYield::get_input_value_port_count() const {

	return 0;
}
int VisualScriptYield::get_output_value_port_count() const {

	return 0;
}

String VisualScriptYield::get_output_sequence_port_text(int p_port) const {

	return String();
}

PropertyInfo VisualScriptYield::get_input_value_port_info(int p_idx) const {

	return PropertyInfo();
}

PropertyInfo VisualScriptYield::get_output_value_port_info(int p_idx) const {

	return PropertyInfo();
}

String VisualScriptYield::get_caption() const {

	return yield_mode == YIELD_RETURN ? "Yield" : "Wait";
}

String VisualScriptYield::get_text() const {

	switch (yield_mode) {
		case YIELD_RETURN: return ""; break;
		case YIELD_FRAME: return "Next Frame"; break;
		case YIELD_PHYSICS_FRAME: return "Next Physics Frame"; break;
		case YIELD_WAIT: return rtos(wait_time) + " sec(s)"; break;
	}

	return String();
}

class VisualScriptNodeInstanceYield : public VisualScriptNodeInstance {
public:
	VisualScriptYield::YieldMode mode;
	float wait_time;

	virtual int get_working_memory_size() const { return 1; } //yield needs at least 1
	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
	//virtual bool get_output_port_unsequenced(int p_idx,Variant* r_value,Variant* p_working_mem,String &r_error) const { return false; }

	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Variant::CallError &r_error, String &r_error_str) {

		if (p_start_mode == START_MODE_RESUME_YIELD) {
			return 0; //resuming yield
		} else {
			//yield

			SceneTree *tree = Object::cast_to<SceneTree>(OS::get_singleton()->get_main_loop());
			if (!tree) {
				r_error_str = "Main Loop is not SceneTree";
				r_error.error = Variant::CallError::CALL_ERROR_INVALID_METHOD;
				return 0;
			}

			Ref<VisualScriptFunctionState> state;
			state.instance();

			int ret = STEP_YIELD_BIT;
			switch (mode) {

				case VisualScriptYield::YIELD_RETURN:
					ret = STEP_EXIT_FUNCTION_BIT;
					break; //return the yield
				case VisualScriptYield::YIELD_FRAME: state->connect_to_signal(tree, "idle_frame", Array()); break;
				case VisualScriptYield::YIELD_PHYSICS_FRAME: state->connect_to_signal(tree, "physics_frame", Array()); break;
				case VisualScriptYield::YIELD_WAIT: state->connect_to_signal(tree->create_timer(wait_time).ptr(), "timeout", Array()); break;
			}

			*p_working_mem = state;

			return ret;
		}
	}
};

VisualScriptNodeInstance *VisualScriptYield::instance(VisualScriptInstance *p_instance) {

	VisualScriptNodeInstanceYield *instance = memnew(VisualScriptNodeInstanceYield);
	//instance->instance=p_instance;
	instance->mode = yield_mode;
	instance->wait_time = wait_time;
	return instance;
}

void VisualScriptYield::set_yield_mode(YieldMode p_mode) {

	if (yield_mode == p_mode)
		return;
	yield_mode = p_mode;
	ports_changed_notify();
	_change_notify();
}

VisualScriptYield::YieldMode VisualScriptYield::get_yield_mode() {

	return yield_mode;
}

void VisualScriptYield::set_wait_time(float p_time) {

	if (wait_time == p_time)
		return;
	wait_time = p_time;
	ports_changed_notify();
}

float VisualScriptYield::get_wait_time() {

	return wait_time;
}

void VisualScriptYield::_validate_property(PropertyInfo &property) const {

	if (property.name == "wait_time") {
		if (yield_mode != YIELD_WAIT) {
			property.usage = 0;
		}
	}
}

void VisualScriptYield::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_yield_mode", "mode"), &VisualScriptYield::set_yield_mode);
	ClassDB::bind_method(D_METHOD("get_yield_mode"), &VisualScriptYield::get_yield_mode);

	ClassDB::bind_method(D_METHOD("set_wait_time", "sec"), &VisualScriptYield::set_wait_time);
	ClassDB::bind_method(D_METHOD("get_wait_time"), &VisualScriptYield::get_wait_time);

	ADD_PROPERTY(PropertyInfo(Variant::INT, "mode", PROPERTY_HINT_ENUM, "Frame,Physics Frame,Time", PROPERTY_USAGE_NOEDITOR), "set_yield_mode", "get_yield_mode");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "wait_time"), "set_wait_time", "get_wait_time");

	BIND_ENUM_CONSTANT(YIELD_FRAME);
	BIND_ENUM_CONSTANT(YIELD_PHYSICS_FRAME);
	BIND_ENUM_CONSTANT(YIELD_WAIT);
}

VisualScriptYield::VisualScriptYield() {

	yield_mode = YIELD_FRAME;
	wait_time = 1;
}

template <VisualScriptYield::YieldMode MODE>
static Ref<VisualScriptNode> create_yield_node(const String &p_name) {

	Ref<VisualScriptYield> node;
	node.instance();
	node->set_yield_mode(MODE);
	return node;
}

///////////////////////////////////////////////////
////////////////YIELD SIGNAL//////////////////////
//////////////////////////////////////////////////

int VisualScriptYieldSignal::get_output_sequence_port_count() const {

	return 1;
}

bool VisualScriptYieldSignal::has_input_sequence_port() const {

	return true;
}
#ifdef TOOLS_ENABLED

static Node *_find_script_node(Node *p_edited_scene, Node *p_current_node, const Ref<Script> &script) {

	if (p_edited_scene != p_current_node && p_current_node->get_owner() != p_edited_scene)
		return NULL;

	Ref<Script> scr = p_current_node->get_script();

	if (scr.is_valid() && scr == script)
		return p_current_node;

	for (int i = 0; i < p_current_node->get_child_count(); i++) {
		Node *n = _find_script_node(p_edited_scene, p_current_node->get_child(i), script);
		if (n)
			return n;
	}

	return NULL;
}

#endif
Node *VisualScriptYieldSignal::_get_base_node() const {

#ifdef TOOLS_ENABLED
	Ref<Script> script = get_visual_script();
	if (!script.is_valid())
		return NULL;

	MainLoop *main_loop = OS::get_singleton()->get_main_loop();
	SceneTree *scene_tree = Object::cast_to<SceneTree>(main_loop);

	if (!scene_tree)
		return NULL;

	Node *edited_scene = scene_tree->get_edited_scene_root();

	if (!edited_scene)
		return NULL;

	Node *script_node = _find_script_node(edited_scene, edited_scene, script);

	if (!script_node)
		return NULL;

	if (!script_node->has_node(base_path))
		return NULL;

	Node *path_to = script_node->get_node(base_path);

	return path_to;
#else

	return NULL;
#endif
}

StringName VisualScriptYieldSignal::_get_base_type() const {

	if (call_mode == CALL_MODE_SELF && get_visual_script().is_valid())
		return get_visual_script()->get_instance_base_type();
	else if (call_mode == CALL_MODE_NODE_PATH && get_visual_script().is_valid()) {
		Node *path = _get_base_node();
		if (path)
			return path->get_class();
	}

	return base_type;
}

int VisualScriptYieldSignal::get_input_value_port_count() const {

	if (call_mode == CALL_MODE_INSTANCE)
		return 1;
	else
		return 0;
}
int VisualScriptYieldSignal::get_output_value_port_count() const {

	MethodInfo sr;

	if (!ClassDB::get_signal(_get_base_type(), signal, &sr))
		return 0;

	return sr.arguments.size();
}

String VisualScriptYieldSignal::get_output_sequence_port_text(int p_port) const {

	return String();
}

PropertyInfo VisualScriptYieldSignal::get_input_value_port_info(int p_idx) const {

	if (call_mode == CALL_MODE_INSTANCE)
		return PropertyInfo(Variant::OBJECT, "instance");
	else
		return PropertyInfo();
}

PropertyInfo VisualScriptYieldSignal::get_output_value_port_info(int p_idx) const {

	MethodInfo sr;

	if (!ClassDB::get_signal(_get_base_type(), signal, &sr))
		return PropertyInfo(); //no signal
	ERR_FAIL_INDEX_V(p_idx, sr.arguments.size(), PropertyInfo());
	return sr.arguments[p_idx];
}

String VisualScriptYieldSignal::get_caption() const {

	static const char *cname[3] = {
		"WaitSignal",
		"WaitNodeSignal",
		"WaitInstanceSigna;",
	};

	return cname[call_mode];
}

String VisualScriptYieldSignal::get_text() const {

	if (call_mode == CALL_MODE_SELF)
		return "  " + String(signal) + "()";
	else
		return "  " + _get_base_type() + "." + String(signal) + "()";
}

void VisualScriptYieldSignal::set_base_type(const StringName &p_type) {

	if (base_type == p_type)
		return;

	base_type = p_type;

	_change_notify();
	ports_changed_notify();
}

StringName VisualScriptYieldSignal::get_base_type() const {

	return base_type;
}

void VisualScriptYieldSignal::set_signal(const StringName &p_type) {

	if (signal == p_type)
		return;

	signal = p_type;

	_change_notify();
	ports_changed_notify();
}
StringName VisualScriptYieldSignal::get_signal() const {

	return signal;
}

void VisualScriptYieldSignal::set_base_path(const NodePath &p_type) {

	if (base_path == p_type)
		return;

	base_path = p_type;

	_change_notify();
	ports_changed_notify();
}

NodePath VisualScriptYieldSignal::get_base_path() const {

	return base_path;
}

void VisualScriptYieldSignal::set_call_mode(CallMode p_mode) {

	if (call_mode == p_mode)
		return;

	call_mode = p_mode;

	_change_notify();
	ports_changed_notify();
}

VisualScriptYieldSignal::CallMode VisualScriptYieldSignal::get_call_mode() const {

	return call_mode;
}

void VisualScriptYieldSignal::_validate_property(PropertyInfo &property) const {

	if (property.name == "base_type") {
		if (call_mode != CALL_MODE_INSTANCE) {
			property.usage = PROPERTY_USAGE_NOEDITOR;
		}
	}

	if (property.name == "node_path") {
		if (call_mode != CALL_MODE_NODE_PATH) {
			property.usage = 0;
		} else {

			Node *bnode = _get_base_node();
			if (bnode) {
				property.hint_string = bnode->get_path(); //convert to loong string
			}
		}
	}

	if (property.name == "signal") {
		property.hint = PROPERTY_HINT_ENUM;

		List<MethodInfo> methods;

		ClassDB::get_signal_list(_get_base_type(), &methods);

		List<String> mstring;
		for (List<MethodInfo>::Element *E = methods.front(); E; E = E->next()) {
			if (E->get().name.begins_with("_"))
				continue;
			mstring.push_back(E->get().name.get_slice(":", 0));
		}

		mstring.sort();

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

			if (ml != String())
				ml += ",";
			ml += E->get();
		}

		property.hint_string = ml;
	}
}

void VisualScriptYieldSignal::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_base_type", "base_type"), &VisualScriptYieldSignal::set_base_type);
	ClassDB::bind_method(D_METHOD("get_base_type"), &VisualScriptYieldSignal::get_base_type);

	ClassDB::bind_method(D_METHOD("set_signal", "signal"), &VisualScriptYieldSignal::set_signal);
	ClassDB::bind_method(D_METHOD("get_signal"), &VisualScriptYieldSignal::get_signal);

	ClassDB::bind_method(D_METHOD("set_call_mode", "mode"), &VisualScriptYieldSignal::set_call_mode);
	ClassDB::bind_method(D_METHOD("get_call_mode"), &VisualScriptYieldSignal::get_call_mode);

	ClassDB::bind_method(D_METHOD("set_base_path", "base_path"), &VisualScriptYieldSignal::set_base_path);
	ClassDB::bind_method(D_METHOD("get_base_path"), &VisualScriptYieldSignal::get_base_path);

	String bt;
	for (int i = 0; i < Variant::VARIANT_MAX; i++) {
		if (i > 0)
			bt += ",";

		bt += Variant::get_type_name(Variant::Type(i));
	}

	ADD_PROPERTY(PropertyInfo(Variant::INT, "call_mode", PROPERTY_HINT_ENUM, "Self,Node Path,Instance"), "set_call_mode", "get_call_mode");
	ADD_PROPERTY(PropertyInfo(Variant::STRING, "base_type", PROPERTY_HINT_TYPE_STRING, "Object"), "set_base_type", "get_base_type");
	ADD_PROPERTY(PropertyInfo(Variant::NODE_PATH, "node_path", PROPERTY_HINT_NODE_PATH_TO_EDITED_NODE), "set_base_path", "get_base_path");
	ADD_PROPERTY(PropertyInfo(Variant::STRING, "signal"), "set_signal", "get_signal");

	BIND_ENUM_CONSTANT(CALL_MODE_SELF);
	BIND_ENUM_CONSTANT(CALL_MODE_NODE_PATH);
	BIND_ENUM_CONSTANT(CALL_MODE_INSTANCE);
}

class VisualScriptNodeInstanceYieldSignal : public VisualScriptNodeInstance {
public:
	VisualScriptYieldSignal::CallMode call_mode;
	NodePath node_path;
	int output_args;
	StringName signal;

	VisualScriptYieldSignal *node;
	VisualScriptInstance *instance;

	virtual int get_working_memory_size() const { return 1; }
	//virtual bool is_output_port_unsequenced(int p_idx) const { return false; }
	//virtual bool get_output_port_unsequenced(int p_idx,Variant* r_value,Variant* p_working_mem,String &r_error) const { return true; }

	virtual int step(const Variant **p_inputs, Variant **p_outputs, StartMode p_start_mode, Variant *p_working_mem, Variant::CallError &r_error, String &r_error_str) {

		if (p_start_mode == START_MODE_RESUME_YIELD) {
			return 0; //resuming yield
		} else {
			//yield

			Object *object = NULL;

			switch (call_mode) {

				case VisualScriptYieldSignal::CALL_MODE_SELF: {

					object = instance->get_owner_ptr();

				} break;
				case VisualScriptYieldSignal::CALL_MODE_NODE_PATH: {

					Node *node = Object::cast_to<Node>(instance->get_owner_ptr());
					if (!node) {
						r_error.error = Variant::CallError::CALL_ERROR_INVALID_METHOD;
						r_error_str = "Base object is not a Node!";
						return 0;
					}

					Node *another = node->get_node(node_path);
					if (!another) {
						r_error.error = Variant::CallError::CALL_ERROR_INVALID_METHOD;
						r_error_str = "Path does not lead Node!";
						return 0;
					}

					object = another;

				} break;
				case VisualScriptYieldSignal::CALL_MODE_INSTANCE: {

					object = *p_inputs[0];
					if (!object) {
						r_error.error = Variant::CallError::CALL_ERROR_INVALID_METHOD;
						r_error_str = "Supplied instance input is null.";
						return 0;
					}

				} break;
			}

			Ref<VisualScriptFunctionState> state;
			state.instance();

			state->connect_to_signal(object, signal, Array());

			*p_working_mem = state;

			return STEP_YIELD_BIT;
		}
	}
};

VisualScriptNodeInstance *VisualScriptYieldSignal::instance(VisualScriptInstance *p_instance) {

	VisualScriptNodeInstanceYieldSignal *instance = memnew(VisualScriptNodeInstanceYieldSignal);
	instance->node = this;
	instance->instance = p_instance;
	instance->signal = signal;
	instance->call_mode = call_mode;
	instance->node_path = base_path;
	instance->output_args = get_output_value_port_count();
	return instance;
}
VisualScriptYieldSignal::VisualScriptYieldSignal() {

	call_mode = CALL_MODE_SELF;
	base_type = "Object";
}

template <VisualScriptYieldSignal::CallMode cmode>
static Ref<VisualScriptNode> create_yield_signal_node(const String &p_name) {

	Ref<VisualScriptYieldSignal> node;
	node.instance();
	node->set_call_mode(cmode);
	return node;
}

void register_visual_script_yield_nodes() {

	VisualScriptLanguage::singleton->add_register_func("functions/wait/wait_frame", create_yield_node<VisualScriptYield::YIELD_FRAME>);
	VisualScriptLanguage::singleton->add_register_func("functions/wait/wait_physics_frame", create_yield_node<VisualScriptYield::YIELD_PHYSICS_FRAME>);
	VisualScriptLanguage::singleton->add_register_func("functions/wait/wait_time", create_yield_node<VisualScriptYield::YIELD_WAIT>);

	VisualScriptLanguage::singleton->add_register_func("functions/yield", create_yield_node<VisualScriptYield::YIELD_RETURN>);
	VisualScriptLanguage::singleton->add_register_func("functions/yield_signal", create_node_generic<VisualScriptYieldSignal>);
}
