/*************************************************************************/
/*  visual_script_yield_nodes.cpp                                        */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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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, Callable::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 = Callable::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();
	notify_property_list_changed();
}

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::FLOAT, "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 nullptr;
	}

	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 nullptr;
}

#endif
Node *VisualScriptYieldSignal::_get_base_node() const {
#ifdef TOOLS_ENABLED
	Ref<Script> script = get_visual_script();
	if (!script.is_valid()) {
		return nullptr;
	}

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

	if (!scene_tree) {
		return nullptr;
	}

	Node *edited_scene = scene_tree->get_edited_scene_root();

	if (!edited_scene) {
		return nullptr;
	}

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

	if (!script_node) {
		return nullptr;
	}

	if (!script_node->has_node(base_path)) {
		return nullptr;
	}

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

	return path_to;
#else

	return nullptr;
#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;

	notify_property_list_changed();
	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;

	notify_property_list_changed();
	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;

	notify_property_list_changed();
	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;

	notify_property_list_changed();
	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 long 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, Callable::CallError &r_error, String &r_error_str) {
		if (p_start_mode == START_MODE_RESUME_YIELD) {
			return 0; //resuming yield
		} else {
			//yield

			Object *object = nullptr;

			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 = Callable::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 = Callable::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 = Callable::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>);
}