#pragma once
#include <iostream>
#include <memory>

#include "ifaces/ILinkMixin.h"
#include "ifaces/INode.h"
#include "Logger.h"

/// \brief Базовый миксин для реализации ILinkMixin для INode.
/// Предоставляет базовую реализацию методов для работы с дочерними узлами и родителем.
class BaseLinkMixin : public virtual ILinkMixin<INode>,
		      public std::enable_shared_from_this<ILinkMixin<INode>> {
	using ElemPtr = std::shared_ptr<INode>;

public:
	~BaseLinkMixin() override {
		Logger::get("ConDes").dbg("--- Destructor called for: BaseLinkMixin");
	}

	operator std::shared_ptr<INode>() override {
		return this->getNode();
	}

	void linkChild(const ElemPtr& child) override {
		getLink()->addChild(child);

		auto childLink = child->getLink();
		childLink->setParent(getNode());
	}

	void unlinkParent() override {
		auto link = getLink();

		ElemPtr parent = link->getParent();
		if (!parent)
			throw std::logic_error("Have no parent!");

		auto parentLink = parent->getLink();

		/* NOTE:
		 *
		 * Keep a reference to the node we gonna to unlink.
		 * Otherwise, we'll disappear between `removeChild` and
		 * `setParent`. Do not rearrange these calls, because
		 * we want to modify the tree top down.
		 */
		auto node = getNode();
		parentLink->removeChild(node);
		getLink()->setParent(nullptr);
	}

	ElemPtr parent() override {
		auto link = getLink();

		ElemPtr parent = link->getParent();

		return parent;
	}

	const std::vector<ElemPtr>& children() override {
		auto link = getLink();
		return link->getChildren();
	}

protected:
	ElemPtr getNode() {
		return std::dynamic_pointer_cast<INode>(shared_from_this());
	}
};