import React, { useState, useEffect, useRef, useCallback } from 'react';
import { ArrowLeft, Trophy, Sparkles, Moon, Sun } from 'lucide-react';

// --- MODEL KOTA (Animacje CSS zostają, bo są czasowe, nie klatkowe) ---
interface DetailedKittyProps {
    isJumping: boolean;
    isNight: boolean;
    isGameOver: boolean;
}

const DetailedKitty: React.FC<DetailedKittyProps> = ({ isJumping, isNight, isGameOver }) => {
    const mainColor = isGameOver ? (isNight ? '#475569' : '#cbd5e1') : (isNight ? '#f8fafc' : '#f472b6');
    const stripeColor = isNight ? '#cbd5e1' : '#ec4899';
    const earColor = isNight ? '#334155' : '#fbcfe8';

    return (
        <div className={`relative w-20 h-14 transition-all duration-200 ${isJumping ? '-rotate-6 scale-110' : ''}`}>
            <div className="absolute -left-4 top-4 w-8 h-3 rounded-full origin-right rotate-[-20deg]"
                style={{ backgroundColor: mainColor, animation: !isGameOver ? 'tail-wag 0.8s ease-in-out infinite' : 'none' }} />
            <div className="absolute inset-0 rounded-[2rem] overflow-hidden shadow-sm" style={{ backgroundColor: mainColor }}>
                <div className="absolute top-0 left-1/4 w-2 h-4 rounded-full opacity-30" style={{ backgroundColor: stripeColor }} />
                <div className="absolute top-0 left-1/2 w-2 h-4 rounded-full opacity-30" style={{ backgroundColor: stripeColor }} />
            </div>
            <div className="absolute -right-4 -top-6 w-14 h-13 rounded-full shadow-sm" style={{ backgroundColor: mainColor }}>
                <div className="absolute -top-2 left-1 w-5 h-6 rounded-t-full rotate-[-15deg]" style={{ backgroundColor: mainColor }}>
                    <div className="absolute inset-1 rounded-t-full" style={{ backgroundColor: earColor }} />
                </div>
                <div className="absolute -top-2 right-1 w-5 h-6 rounded-t-full rotate-[15deg]" style={{ backgroundColor: mainColor }}>
                    <div className="absolute inset-1 rounded-t-full" style={{ backgroundColor: earColor }} />
                </div>
                <div className={`absolute top-5 left-3 w-2.5 h-2.5 rounded-full ${isGameOver ? 'bg-slate-500 text-[10px] flex items-center justify-center' : 'bg-slate-900'}`}>
                    {isGameOver ? 'x' : <div className="absolute top-0.5 left-0.5 w-1 h-1 bg-white rounded-full opacity-70" />}
                </div>
                <div className={`absolute top-5 right-3 w-2.5 h-2.5 rounded-full ${isGameOver ? 'bg-slate-500 text-[10px] flex items-center justify-center' : 'bg-slate-900'}`}>
                    {isGameOver ? 'x' : <div className="absolute top-0.5 left-0.5 w-1 h-1 bg-white rounded-full opacity-70" />}
                </div>
                <div className="absolute top-8 left-1/2 -translate-x-1/2 w-2 h-1.5 bg-pink-400 rounded-full" />
            </div>
            {/* Łapki */}
            <div className="absolute bottom-[-10px] left-4 w-3 h-6 rounded-full origin-top"
                style={{ backgroundColor: mainColor, animation: !isJumping && !isGameOver ? 'kitty-walk 0.2s infinite' : 'none', transform: isJumping ? 'rotate(45deg)' : 'none' }}>
                <div className="absolute bottom-0 w-full h-2 bg-white rounded-full opacity-60" />
            </div>
            <div className="absolute bottom-[-10px] right-5 w-3 h-6 rounded-full origin-top"
                style={{ backgroundColor: mainColor, animation: !isJumping && !isGameOver ? 'kitty-walk-alt 0.2s infinite' : 'none', transform: isJumping ? 'rotate(-45deg)' : 'none' }}>
                <div className="absolute bottom-0 w-full h-2 bg-white rounded-full opacity-60" />
            </div>
        </div>
    );
};

// --- GŁÓWNY KOMPONENT Z DYNAMICZNYM DELTA TIME ---
export const KittyGame: React.FC<{ onBack: () => void }> = ({ onBack }) => {
    const [isPlaying, setIsPlaying] = useState(false);
    const [gameOver, setGameOver] = useState(false);
    const [score, setScore] = useState(0);
    const [highScore, setHighScore] = useState<number>(() => {
        const saved = localStorage.getItem('kittyHighScore');
        return saved ? parseInt(saved, 10) : 0;
    });

    const [displayKittyY, setDisplayKittyY] = useState(0);
    const [displayObstacleX, setDisplayObstacleX] = useState(650);

    const isNight = Math.floor(score / 10) % 2 === 1;

    // Referencje fizyczne
    const kittyYRef = useRef(0);
    const obstacleXRef = useRef(650);
    const velocityRef = useRef(0);
    const scoreRef = useRef(0);
    const requestRef = useRef<number>(0);
    const lastTimeRef = useRef<number>(0);

    // STAŁE KONFIGURACYJNE (Wartości na sekundę - niezależne od Hz)
    const GRAVITY = 1800;        // Kot spadnie o 1800px w ciągu sekundy (jeśli nie ma prędkości początkowej)
    const JUMP_FORCE = -550;     // Prędkość startowa skoku
    const INITIAL_SPEED = 380;   // Prędkość przeszkody w px/s
    const SPEED_INCREMENT = 12;  // Przyspieszenie px/s na każdy punkt
    const GROUND_Y = 0;

    const endGame = useCallback(() => {
        setGameOver(true);
        setIsPlaying(false);
        const currentHS = parseInt(localStorage.getItem('kittyHighScore') || '0', 10);
        if (scoreRef.current > currentHS) {
            setHighScore(scoreRef.current);
            localStorage.setItem('kittyHighScore', scoreRef.current.toString());
        }
    }, []);

    const startGame = useCallback(() => {
        setIsPlaying(true);
        setGameOver(false);
        setScore(0);
        scoreRef.current = 0;
        kittyYRef.current = 0;
        obstacleXRef.current = 700;
        velocityRef.current = 0;
        // Kluczowe: inicjalizacja czasu startu
        lastTimeRef.current = performance.now();
        setDisplayKittyY(0);
        setDisplayObstacleX(700);
    }, []);

    const jump = useCallback(() => {
        if (kittyYRef.current <= GROUND_Y && !gameOver && isPlaying) {
            velocityRef.current = JUMP_FORCE;
        }
    }, [gameOver, isPlaying]);

    useEffect(() => {
        const update = (currentTime: number) => {
            if (gameOver || !isPlaying) return;

            // --- OBLICZANIE DELTA TIME (Dynamiczna szybkość) ---
            // dt to czas w sekundach, jaki upłynął od ostatniej klatki (np. 0.016 dla 60Hz, 0.007 dla 144Hz)
            const dt = (currentTime - lastTimeRef.current) / 1000;
            lastTimeRef.current = currentTime;

            // Zabezpieczenie przed "skokiem" (np. gdy użytkownik zmieni kartę w przeglądarce)
            const frameTime = Math.min(dt, 0.1);

            // Fizyka kota (jednostki * czas)
            velocityRef.current += GRAVITY * frameTime;
            kittyYRef.current -= velocityRef.current * frameTime;

            if (kittyYRef.current <= GROUND_Y) {
                kittyYRef.current = GROUND_Y;
                velocityRef.current = 0;
            }

            // Ruch przeszkody (prędkość * czas)
            const currentSpeed = INITIAL_SPEED + (scoreRef.current * SPEED_INCREMENT);
            obstacleXRef.current -= currentSpeed * frameTime;

            // Reset przeszkody
            if (obstacleXRef.current < -80) {
                obstacleXRef.current = 750;
                scoreRef.current += 1;
                setScore(scoreRef.current);
            }

            // Kolizja (strefa trafienia dopasowana do czasu)
            if (obstacleXRef.current < 100 && obstacleXRef.current > 20 && kittyYRef.current < 45) {
                endGame();
                return;
            }

            // Renderowanie wizualne
            setDisplayKittyY(kittyYRef.current);
            setDisplayObstacleX(obstacleXRef.current);

            requestRef.current = requestAnimationFrame(update);
        };

        if (isPlaying && !gameOver) {
            requestRef.current = requestAnimationFrame(update);
        }
        return () => cancelAnimationFrame(requestRef.current);
    }, [isPlaying, gameOver, endGame]);

    useEffect(() => {
        const handleKey = (e: KeyboardEvent) => {
            if (e.code === 'Space') {
                e.preventDefault();
                if (!isPlaying || gameOver) startGame(); else jump();
            }
        };
        window.addEventListener('keydown', handleKey);
        return () => window.removeEventListener('keydown', handleKey);
    }, [isPlaying, gameOver, startGame, jump]);

    return (
        <div className="flex flex-col items-center justify-center min-h-[70vh] p-4 font-sans select-none">
            <button onClick={onBack} className="mb-6 flex items-center gap-2 text-pink-500 font-bold hover:scale-105 transition-all outline-none">
                <ArrowLeft size={20} /> Back
            </button>

            <div
                className={`relative w-full max-w-[650px] h-[340px] rounded-[3.5rem] shadow-2xl border-4 transition-colors duration-1000 overflow-hidden cursor-pointer
                ${isNight ? 'bg-slate-950 border-indigo-500 shadow-indigo-500/20' : 'bg-white border-pink-100 shadow-pink-200/50'}`}
                onClick={() => { if (!isPlaying || gameOver) startGame(); else jump(); }}
            >
                {/* Niebo */}
                <div className={`absolute top-10 left-12 transition-all duration-1000 ${isNight ? 'translate-y-0 opacity-100' : '-translate-y-20 opacity-0'}`}>
                    <Moon className="text-indigo-200 fill-indigo-100" size={48} />
                </div>
                <div className={`absolute top-10 left-12 transition-all duration-1000 ${isNight ? '-translate-y-20 opacity-0' : 'translate-y-0 opacity-100'}`}>
                    <Sun className="text-yellow-400 fill-yellow-200" size={48} />
                </div>

                {/* UI Score */}
                <div className={`absolute top-6 right-8 text-right z-10 font-black transition-colors duration-1000 ${isNight ? 'text-indigo-100' : 'text-pink-500'}`}>
                    <div className="text-3xl tracking-tighter">Score: {score}</div>
                    <div className={`text-sm flex items-center justify-end gap-1 ${isNight ? 'text-indigo-400' : 'text-pink-300'}`}>
                        <Trophy size={14} /> High: {highScore}
                    </div>
                </div>

                {/* KOTEK */}
                <div className="absolute left-10" style={{ bottom: `${displayKittyY + 48}px` }}>
                    <DetailedKitty isJumping={displayKittyY > 2} isNight={isNight} isGameOver={gameOver} />
                </div>

                {/* PRZESZKODA */}
                <div
                    className={`absolute bottom-12 w-14 h-14 rounded-full border-2 flex items-center justify-center animate-spin transition-colors duration-1000
                    ${isNight ? 'bg-indigo-900 border-indigo-400 shadow-[0_0_15px_rgba(129,140,248,0.3)]' : 'bg-pink-100 border-pink-300'}`}
                    style={{ left: `${displayObstacleX}px` }}
                >
                    <div className={`w-10 h-1.5 rounded-full ${isNight ? 'bg-indigo-300' : 'bg-pink-400'} rotate-45`} />
                    <div className={`absolute w-10 h-1.5 rounded-full ${isNight ? 'bg-indigo-300' : 'bg-pink-400'} -rotate-45`} />
                </div>

                {/* Ziemia */}
                <div className={`absolute bottom-0 w-full h-12 border-t-4 transition-colors duration-1000 flex items-center justify-around
                ${isNight ? 'bg-slate-900 border-indigo-900 text-indigo-950' : 'bg-pink-50 border-pink-100 text-pink-100'}`}>
                    {[...Array(10)].map((_, i) => <span key={i} className="text-2xl grayscale opacity-50">🐾</span>)}
                </div>

                {/* Ekrany start/stop */}
                {!isPlaying && !gameOver && (
                    <div className="absolute inset-0 bg-white/20 backdrop-blur-[4px] flex items-center justify-center z-20">
                        <div className="bg-white p-12 rounded-[3.5rem] shadow-2xl flex flex-col items-center border-4 border-pink-100 transform hover:scale-105 transition-transform">
                            <Sparkles className="text-yellow-400 mb-4 animate-pulse" size={50} />
                            <button className="bg-pink-500 text-white px-12 py-5 rounded-2xl font-black text-2xl shadow-lg hover:bg-pink-600 transition-colors">
                                START
                            </button>
                            <p className="mt-4 text-slate-400 font-bold text-sm uppercase tracking-widest">Click or Space</p>
                        </div>
                    </div>
                )}

                {gameOver && (
                    <div className={`absolute inset-0 backdrop-blur-md flex flex-col items-center justify-center text-center p-6 z-30 transition-colors duration-1000
                    ${isNight ? 'bg-slate-950/90' : 'bg-pink-50/90'}`}>
                        <h3 className={`text-6xl font-black mb-4 ${isNight ? 'text-white' : 'text-pink-600'}`}>Oh No! 😿</h3>
                        <div className={`text-3xl font-bold mb-8 ${isNight ? 'text-indigo-300' : 'text-pink-400'}`}>Score: {score}</div>
                        <button className="bg-pink-500 text-white border-4 border-white px-14 py-5 rounded-2xl font-black text-2xl hover:scale-110 transition-all shadow-xl active:scale-95">
                            TRY AGAIN
                        </button>
                    </div>
                )}
            </div>
            
        </div>
    );
};