snake_game_layer.h

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#ifndef SNAKE_GAME_LAYER_H
#define SNAKE_GAME_LAYER_H
 
#include "../security_layer.h"
 
class QLabel;
class TranslationManager;

class SnakeGameLayer final : public SecurityLayer {
    Q_OBJECT
 
public:
    explicit SnakeGameLayer(QWidget *parent = nullptr);

    ~SnakeGameLayer() override;

    void Initialize() override;

    void Reset() override;
 
protected:
    void keyPressEvent(QKeyEvent *event) override;

    bool eventFilter(QObject *watched, QEvent *event) override;
 
private slots:
    void UpdateGame();

    void FinishGame(bool success);

    void OpenBorder();

    void UpdateBorderAnimation();
 
private:
    enum class Direction {
        Up,
        Right,
        Down,
        Left
    };

    enum class CellType {
        Empty, 
        Snake, 
        SnakeHead, 
        Apple, 
        OpenBorder 
    };

    enum class GameState {
        Playing, 
        ExitOpen, 
        Completed, 
        Failed 
    };

    enum class BorderSide {
        Left,
        Right
    };

    void InitializeGame();

    void RenderGame() const;

    void MoveSnake();

    void GenerateApple();

    bool IsCollision(int x, int y) const;

    void HandleInput(int key);

    bool IsExitPoint(int x, int y) const;

    QLabel *game_board_;
    QLabel *score_label_;
    QTimer *game_timer_;
    QTimer *border_animation_timer_;

    static constexpr int kGridSize = 12;
    static constexpr int kCellSize = 20;

    CellType grid_[kGridSize][kGridSize];
    QVector<QPair<int, int> > snake_;
    QPair<int, int> apple_;
    Direction direction_;
    Direction last_processed_direction_;
    int apples_collected_;
    bool game_over_;

    GameState game_state_;
    BorderSide exit_side_;
    int exit_position_;
    int animation_progress_;
    int parts_exited_;
    QVector<QPair<int, int> > exit_points_;
    TranslationManager *translator_;
};
 
#endif // SNAKE_GAME_LAYER_H