/**
 * blackboard.cpp
 * =============================================================================
 * Copyright 2021-2023 Serhii Snitsaruk
 *
 * Use of this source code is governed by an MIT-style
 * license that can be found in the LICENSE file or at
 * https://opensource.org/licenses/MIT.
 * =============================================================================
 */

#include "blackboard.h"

#include "core/error/error_macros.h"
#include "core/variant/variant.h"
#include "scene/main/node.h"

Ref<Blackboard> Blackboard::top() const {
	Ref<Blackboard> bb(this);
	while (bb->get_parent_scope().is_valid()) {
		bb = bb->get_parent_scope();
	}
	return bb;
}

Variant Blackboard::get_var(const Variant &p_key, const Variant &p_default) const {
	if (data.has(p_key)) {
		return data.get_valid(p_key);
	} else if (parent.is_valid()) {
		return parent->get_var(p_key, p_default);
	} else {
		return p_default;
	}
}

void Blackboard::set_var(const Variant &p_key, const Variant &p_value) {
	data[p_key] = p_value;
}

bool Blackboard::has_var(const Variant &p_key) const {
	return data.has(p_key) || (parent.is_valid() && parent->has_var(p_key));
}

void Blackboard::erase_var(const Variant &p_key) {
	data.erase(p_key);
}

void Blackboard::prefetch_nodepath_vars(Node *p_node) {
	ERR_FAIL_COND(p_node == nullptr);
	Array keys = data.keys();
	Array values = data.values();
	for (int i = 0; i < keys.size(); i++) {
		if (values[i].get_type() == Variant::NODE_PATH) {
			Node *fetched_node = p_node->get_node_or_null(values[i]);
			if (fetched_node != nullptr) {
				data[keys[i]] = fetched_node;
			}
		}
	}
};

void Blackboard::_bind_methods() {
	ClassDB::bind_method(D_METHOD("get_data"), &Blackboard::get_data);
	ClassDB::bind_method(D_METHOD("set_data", "p_data"), &Blackboard::set_data);
	ClassDB::bind_method(D_METHOD("get_var", "p_key", "p_default"), &Blackboard::get_var, Variant());
	ClassDB::bind_method(D_METHOD("set_var", "p_key", "p_value"), &Blackboard::set_var);
	ClassDB::bind_method(D_METHOD("has_var", "p_key"), &Blackboard::has_var);
	ClassDB::bind_method(D_METHOD("set_parent_scope", "p_blackboard"), &Blackboard::set_parent_scope);
	ClassDB::bind_method(D_METHOD("get_parent_scope"), &Blackboard::get_parent_scope);
	ClassDB::bind_method(D_METHOD("erase_var", "p_key"), &Blackboard::erase_var);
	ClassDB::bind_method(D_METHOD("prefetch_nodepath_vars", "p_node"), &Blackboard::prefetch_nodepath_vars);
	ClassDB::bind_method(D_METHOD("top"), &Blackboard::top);
}