#ifndef MENU_SYSTEM_H_205861EC
#define MENU_SYSTEM_H_205861EC

#include <deque>
#include <vector>
#include "interpolation.h"
#include "menu.h"
#include "system.h"
#include "timer.h"

class Game;

class MenuSystem : public System {
public:

  static constexpr SystemKey Key = SystemKey::Menu;

  explicit MenuSystem(Game& game) : game_(game) {}

  void tick(double dt) override;

  // Commands

  void openPauseMenu();

  void closePauseMenu(bool playSfx = true);

  void pressedUp();

  void pressedDown();

  void pressedLeft();

  void pressedRight();

  void activateOption();

  // Info

  double getPauseAnimationProgress() const { return pauseAnimation_.getProgress(); }

  bool isMenuOpen() const { return openState_ == OpenState::Open && !isMenuChanging_; }

  // Only call this if a menu is open.
  Menu& getMenu() { return menus_.back(); }

  // Only call this if a submenu is open.
  Menu& getParentMenu() { return menus_[menus_.size()-2]; }

  int getCursorBob() const { return cursorBob_; }

  double getMenuChangeAnimationProgress() const { return menuChangeAnimation_.getProgress(); }

  bool isMenuChanging() const { return isMenuChanging_; }

private:

  void openSubmenu(Menu submenu);

  enum class OpenState {
    Closed,
    Animating,
    Open
  };

  Game& game_;

  Interpolation pauseAnimation_;
  OpenState openState_ = OpenState::Closed;

  std::deque<Menu> menus_;

  int cursorBob_ = 0;
  bool cursorBobDown_ = true;
  Timer cursorBobTimer_ { 125 };

  Interpolation menuChangeAnimation_;
  bool isMenuChanging_ = false;
};

#endif /* end of include guard: MENU_SYSTEM_H_205861EC */