#pragma once

#include <string>

#include "cpputils/unique_ptr.hpp"
#include "entities/camera.hpp"
#include "entities/world.hpp"
#include "istate.hpp"
#include "text/token.hpp"
#include "utils/globals.hpp"
#include "utils/light.hpp"

namespace
Nimbin
{

class MenuState : public IState
{
    enum class ItemKind : uint8_t
    {
        OpenFile,
        StartLevel,
        Quit,
    };

    struct MenuItem
    {
        ItemKind    kind;
        size_t      level_index = 0;
        Text::TokenPtr   text3d;
        Vec3        slot_pos {};
        std::string label;
    };

    DynArray<MenuItem> _items;

    cpputils::unique_ptr<World>  _world;
    cpputils::unique_ptr<Camera> _camera;
    cpputils::unique_ptr<Light>  _light;
    Text::TokenPtr               _title;

    double _scroll_current{0.0};
    double _scroll_target {0.0};
    double _time          {0.0};

    size_t _selected      {0};

    void   build_Items       ();
    void   activate          (Game& game);
    bool   is_LevelItem      (size_t idx) const;
    size_t pick_FromCrosshair()           const;

    static uint32_t yaw_FromRadians(double rad);
    static double   yaw_ToRadians  (uint32_t yaw);
public:
    MenuState();

    void handle_Event(Game&, const SDL_Event&)       override;
    void update      (double dt, const GlRenderer*)  override;
    void render      (SDL_Window&, GlRenderer&)      override;
};

} // namespace Nimbin