#ifndef ABSTRACT_WIDGETS_H_
#define ABSTRACT_WIDGETS_H_

#include <cassert>
#include <memory>
#include <vector>
#include "iostream"

namespace widgets {
struct container;

struct ParentGuard {
    friend container;

private:
    explicit ParentGuard() = default;
};

//  NOLINTNEXTLINE
struct widget {
private:
    container *father{nullptr};

protected:
    widget() : w_width(0), w_height(0){};
    //  NOLINTNEXTLINE
    int w_width;
    //  NOLINTNEXTLINE
    int w_height;

public:
    [[nodiscard]] virtual int width() const = 0;
    [[nodiscard]] virtual int height() const = 0;
    [[nodiscard]] virtual widget *child_at(int x, int y) {
        if (x >= 0 && x < width() && y >= 0 && y < height()) {
            return this;
        }
        return nullptr;
    };
    widget(const widget &) = delete;
    widget(widget &&) = delete;
    widget &operator=(const widget &) = delete;
    widget &operator=(widget &&) = delete;
    virtual ~widget() = default;
    // NOLINTNEXTLINE

    void set_parent(container *input, const ParentGuard &) {
        father = input;
    }

    [[nodiscard]] container *parent() const {
        return father;
    }
};

struct container : widget {
    virtual void update_layout() = 0;

private:
    static const ParentGuard parent_guard;

protected:
    void add_parent(widget *child) {
        child->set_parent(static_cast<container *>(this), parent_guard);
    }

    static void remove_parent(widget *child) {
        child->set_parent(nullptr, parent_guard);
    }
};

inline const widgets::ParentGuard widgets::container::parent_guard{};
}  // namespace widgets

#endif  // ABSTRACT_WIDGETS_H_