menu.h

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#ifndef MENU_H_
#define MENU_H_

#include "utils.h"
#include "bytebuffer.h"

#include <string>
#include <vector>
#include <algorithm>

class Menu;

class ParentNULL : public std::runtime_error
{
public:
    ParentNULL() : runtime_error("") { }
};


class IMenu
{
public:
    IMenu(const std::string& label, Menu* parent = NULL); 
    virtual ~IMenu() { } 
    virtual uint32 Print() const = 0; 

    const std::string& GetLabel() const { return _label; } 
    Menu* GetParent() const { return _parent; } 
    void SetParent(Menu* val) { _parent = val; } 

protected:
    Menu* _parent; 
    std::string _label; 
};


class Menu : public IMenu
{
public:
    Menu(const std::string& label, Menu* parent = nullptr) : IMenu(label, parent) { } 
    ~Menu() { for (auto elem: _subMenus) delete elem.second; } 

    uint32 Print() const override;

    IMenu* AddMenu(char indexer, const std::string& label); 
    IMenu* AddMenuItem(char indexer, const std::string& label, uint32 val); 
    IMenu* operator[](char indexer); 
    IMenu* operator[](char indexer) const; 
    IMenu* GetLastSubMenu() { return (_subMenus.end() - 1)->second; } 

    static Menu* Load(ByteBuffer& bb); 

private:
    class Item : public IMenu
    {
    public:
        Item(const std::string& label, uint32 val, Menu* parent = NULL) : IMenu(label, parent), _value(val) { }
        uint32 Print() const override { return _value; }

    private:
        uint32 _value; 
    };

    std::vector<std::pair<char, IMenu*>> _subMenus; 
};

#endif // MENU_H_