src/games/snake/Snake.hpp


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#pragma once

#include <games/Game.hpp>
#include <common/math.hpp>

#include <random>


class Snake : public Game {
public:
    enum Direction : int32_t {
        up,
        down,
        left,
        right,
    };


public:
    Snake();
    bool Update(std::vector<SDL_Event>& events) override;


private:
    void ProcessEventDuringPause(SDL_Event& event);
    void ProcessEventDuringResume(SDL_Event& event);

    void Start(int32_t map_width, int32_t map_height);

    void MaybeMoveSnake(float dt_in_seconds);
    void SpawnFood();

    void Draw();


private:
    static constexpr int32_t max_map_width = 16;
    static constexpr int32_t max_map_height = 16;
    static constexpr float tiles_per_second = 4.0f;

    static std::mt19937 s_rng;
    std::uniform_int_distribution<int32_t> m_dist;

    Direction m_direction;
    Direction m_last_advanced_direction;

    int32_t m_map_width;
    int32_t m_map_height;
    int32_t m_tail {0};
    int32_t m_head {1};
    uint64_t m_body_bitmap[max_map_height];
    V2I32 m_body_positions[max_map_width * max_map_height];
    V2I32 m_food_position;
};