#ifndef PINGPONG_GAME_H
#define PINGPONG_GAME_H

#include <godot_cpp/classes/node2d.hpp>
#include <godot_cpp/classes/label.hpp>
#include <godot_cpp/classes/input_event.hpp>

namespace godot {

class PingPongBall;

// ═══════════════════════════════════════════════════════
// 视觉常量 — 以后替换素材时删除本段
// (颜色值定义在 pingpong_game.cpp 中)
// ═══════════════════════════════════════════════════════
static constexpr float FIELD_INSET = 15.0f;
static constexpr float CENTER_LINE_DASH = 20.0f;
static constexpr float CENTER_LINE_GAP = 12.0f;

// 游戏状态
enum GameState {
    WAITING,
    COUNTDOWN,
    PLAYING,
    SCORED,
    GAME_OVER
};

// 倒计时参数
static constexpr float COUNTDOWN_INTERVAL = 0.75f;
static constexpr int COUNTDOWN_START = 3;
static constexpr float SCORED_PAUSE = 1.2f;

class PingPongGame : public Node2D {
    GDCLASS(PingPongGame, Node2D)

private:
    int left_score = 0;
    int right_score = 0;
    int max_score = 5;

    // 状态机
    GameState state = WAITING;
    float state_timer = 0.0f;
    int countdown_number = COUNTDOWN_START;

    // 子节点引用
    Label *left_score_label = nullptr;
    Label *right_score_label = nullptr;
    Label *message_label = nullptr;
    PingPongBall *ball = nullptr;

    void update_score_display();
    void set_state(GameState p_state);
    void show_message(const String &p_text);

protected:
    static void _bind_methods();

public:
    PingPongGame();
    ~PingPongGame();

    void _ready() override;
    void _process(double delta) override;
    void _draw() override;
    void _input(const Ref<InputEvent> &event) override;

    // 得分处理
    void _on_ball_scored(int which);

    // 重置整局游戏
    void reset_game();
    void start_countdown();

    // 属性 getter/setter
    void set_left_score(int p_score);
    int get_left_score() const;

    void set_right_score(int p_score);
    int get_right_score() const;

    void set_max_score(int p_score);
    int get_max_score() const;

    // 信号: game_over(int winner) — 0=左边赢, 1=右边赢
};

}

#endif // PINGPONG_GAME_H