#pragma once

#include <cstdint>

#include "game_rng.h"

namespace roro::games {

// Pong against the device (issue #101): the player's paddle on the left, the device's on the
// right, first to 7. The ball goes faster with each return, and the device's paddle only moves so
// fast: a steep, fast ball gets past it. Lengths are pixels of the 240 x 122 field, times seconds.
class Pong {
   public:
    static constexpr float kWidth = 240, kHeight = 122;
    static constexpr float kPaddleH = 24, kPaddleW = 3, kMargin = 6, kBall = 4;
    static constexpr float kPlayerSpeed = 150, kDeviceSpeed = 88;
    static constexpr float kServeSpeed = 110, kMaxSpeed = 270, kFaster = 1.06f;
    static constexpr float kServePause = 0.8f;
    static constexpr int kWinScore = 7;

    enum Event : uint8_t { Wall = 1, Hit = 2, Point = 4, Over = 8 };
    enum class Phase : uint8_t { Serve, Play, Over };

    explicit Pong(uint32_t seed) : rng_(seed) { start(); }
    void start();
    // `seconds` later, with the player's paddle asked up (-1), down (1) or left alone (0).
    // What happened, as Events.
    uint8_t step(float seconds, int move);

    Phase phase() const { return phase_; }
    float ballX() const { return x_; }
    float ballY() const { return y_; }
    float speed() const { return speed_; }
    float playerY() const { return player_; }  // the paddle's middle
    float deviceY() const { return device_; }
    int playerScore() const { return playerScore_; }
    int deviceScore() const { return deviceScore_; }
    bool playerWon() const { return playerScore_ >= kWinScore; }
    int rally() const { return rally_; }          // the player's returns since the serve
    int longestRally() const { return longest_; }  // in this game

   private:
    uint8_t tick(float dt, int move);
    void serve(bool toPlayer);
    bool meets(float paddleY) const;
    void bounceOff(float paddleY, bool toRight);

    Rng rng_;
    Phase phase_ = Phase::Serve;
    float x_ = 0, y_ = 0, vx_ = 0, vy_ = 0, speed_ = 0;
    float player_ = 0, device_ = 0, wait_ = 0;
    int playerScore_ = 0, deviceScore_ = 0, rally_ = 0, longest_ = 0;
};

}  // namespace roro::games