/*************************************************************************/
/*  example.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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/* 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   */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/*************************************************************************/

#include "example.h"

#include <godot_cpp/core/class_db.hpp>

#include <godot_cpp/classes/global_constants.hpp>
#include <godot_cpp/classes/label.hpp>
#include <godot_cpp/variant/utility_functions.hpp>

using namespace godot;

ExampleRef::ExampleRef() {
	UtilityFunctions::print("ExampleRef created.");
}

ExampleRef::~ExampleRef() {
	UtilityFunctions::print("ExampleRef destroyed.");
}

void Example::_bind_methods() {
	// Methods.
	ClassDB::bind_method(D_METHOD("simple_func"), &Example::simple_func);
	ClassDB::bind_method(D_METHOD("simple_const_func"), &Example::simple_const_func);
	ClassDB::bind_method(D_METHOD("return_something"), &Example::return_something);
	ClassDB::bind_method(D_METHOD("return_something_const"), &Example::return_something_const);
	ClassDB::bind_method(D_METHOD("return_extended_ref"), &Example::return_extended_ref);
	ClassDB::bind_method(D_METHOD("extended_ref_checks"), &Example::extended_ref_checks);

	{
		MethodInfo mi;
		mi.arguments.push_back(PropertyInfo(Variant::STRING, "some_argument"));
		mi.name = "varargs_func";
		ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "varargs_func", &Example::varargs_func, mi);
	}

	// Properties.
	ADD_GROUP("Test group", "group_");
	ADD_SUBGROUP("Test subgroup", "group_subgroup_");

	ClassDB::bind_method(D_METHOD("get_custom_position"), &Example::get_custom_position);
	ClassDB::bind_method(D_METHOD("set_custom_position", "position"), &Example::set_custom_position);
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "group_subgroup_custom_position"), "set_custom_position", "get_custom_position");

	// Signals.
	ADD_SIGNAL(MethodInfo("custom_signal", PropertyInfo(Variant::STRING, "name"), PropertyInfo(Variant::INT, "value")));
	ClassDB::bind_method(D_METHOD("emit_custom_signal", "name", "value"), &Example::emit_custom_signal);

	// Constants.
	BIND_ENUM_CONSTANT(FIRST);
	BIND_ENUM_CONSTANT(ANSWER_TO_EVERYTHING);

	BIND_CONSTANT(CONSTANT_WITHOUT_ENUM);
}

// Methods.
void Example::simple_func() {
	UtilityFunctions::print("Simple func called.");
}

void Example::simple_const_func() const {
	UtilityFunctions::print("Simple const func called.");
}

String Example::return_something(const String &base) {
	UtilityFunctions::print("Return something called.");
	return base;
}

Viewport *Example::return_something_const() const {
	UtilityFunctions::print("Return something const called.");
	if (is_inside_tree()) {
		Viewport *result = get_viewport();
		return result;
	}
	return nullptr;
}

ExampleRef *Example::return_extended_ref() const {
	return memnew(ExampleRef());
}

Ref<ExampleRef> Example::extended_ref_checks(Ref<ExampleRef> p_ref) const {
	Ref<ExampleRef> ref;
	ref.instantiate();
	// TODO the returned value gets dereferenced too early and return a null object otherwise.
	ref->reference();
	UtilityFunctions::print("Example ref checks called with value: ", p_ref->get_instance_id(), ", returning value: ", ref->get_instance_id());
	return ref;
}

Variant Example::varargs_func(const Variant **args, GDNativeInt arg_count, GDNativeCallError &error) {
	UtilityFunctions::print("Varargs called with ", String::num(arg_count), " arguments");
	return arg_count;
}

void Example::emit_custom_signal(const String &name, int value) {
	emit_signal("custom_signal", name, value);
}

// Properties.
void Example::set_custom_position(const Vector2 &pos) {
	custom_position = pos;
}

Vector2 Example::get_custom_position() const {
	return custom_position;
}

// Virtual function override.
bool Example::_has_point(const Vector2 &point) const {
	Label *label = get_node<Label>("Label");
	label->set_text("Got point: " + Variant(point).stringify());

	return false;
}