import { useEffect, useMemo, useState } from "react";
import { createPortal } from "react-dom";
import { StyleTheme } from "../context/settings";
import { UmaCharacter, loadUmaCharacters } from "../utils/umaCharacters";
import "./WheelConfetti.scss";

type WheelTheme = StyleTheme;

type Props = {
    theme: WheelTheme,
    /** Mění se s každým výsledkem — nová hodnota spustí novou salvu. */
    burstKey: number,
    /** Velká salva (finální výsledek) vs. menší (mezivýsledek). */
    big?: boolean,
};

type UmaImage = { src: string, round: boolean };

const SIMPLE_COLORS = ['#16a34a', '#0ea5e9', '#f59e0b', '#8b5cf6', '#ec4899', '#14b8a6', '#ef4444'];
const UMA_EMOJI = ['🐴', '🏇', '🥕', '🏆', '🌸', '✨', '⭐', '🍙', '🎀', '🥇'];
// Hlášky z fandomu Umamusume (Umapyoi Densetsu, Teio step, hachimī, Golshi, Oguri „okawari"...)
const UMA_BADGES = ['1着!', 'Umazing!', 'Umapyoi!', 'Teio step!', 'Hachimī~', 'Golshi approves', 'Okawari!', 'Pakapaka~', 'ウマい!'];
const UMA_BADGE_COLORS = ['#ff6fa3', '#2e9a3a', '#43b8f0', '#f2a91a'];
const DURATION_MS = 6400;

const rand = (min: number, max: number) => min + Math.random() * (max - min);
const pick = <T,>(list: T[]) => list[Math.floor(Math.random() * list.length)];

type Piece = { id: number, style: React.CSSProperties, content: React.ReactNode, className: string };

type Launch = 'cannon-left' | 'cannon-right' | 'burst' | 'rain';

const LAUNCHES: Launch[] = ['cannon-left', 'cannon-left', 'cannon-right', 'cannon-right', 'burst', 'rain'];

/**
 * Výchozí pozice a dráha jednoho kousku: děla z dolních rohů střílí šikmo vzhůru,
 * „výbuch" se rozletí ze středu a déšť padá opožděně shora. Kousek nejprve vyletí
 * do vrcholu (--x1/--y1) a pak dopadne mimo obrazovku (--x2/--y2).
 */
function launchStyle(launch: Launch): React.CSSProperties {
    let left: number, top: number, x1: number, y1: number, x2: number, y2: number, delay: number;
    switch (launch) {
        case 'cannon-left':
        case 'cannon-right': {
            const dir = launch === 'cannon-left' ? 1 : -1;
            left = launch === 'cannon-left' ? rand(-3, 3) : rand(97, 103);
            top = rand(88, 100);
            x1 = dir * rand(12, 62);
            y1 = -rand(45, 88);
            x2 = x1 + dir * rand(6, 22);
            y2 = rand(12, 25);
            delay = rand(0, 450);
            break;
        }
        case 'burst': {
            const angle = rand(0, Math.PI * 2);
            const radius = rand(18, 48);
            left = 50;
            top = 42;
            x1 = Math.cos(angle) * radius;
            y1 = Math.sin(angle) * radius * 0.8 - rand(5, 15);
            x2 = x1 * 1.35;
            y2 = rand(70, 85);
            delay = rand(0, 250);
            break;
        }
        default: {
            left = rand(0, 100);
            top = -12;
            x1 = rand(-8, 8);
            y1 = rand(35, 55);
            x2 = x1 + rand(-10, 10);
            y2 = rand(115, 125);
            delay = rand(400, 1800);
        }
    }
    const spin = rand(180, 720) * (Math.random() < 0.5 ? -1 : 1);
    return {
        left: `${left}vw`,
        top: `${top}vh`,
        animationName: launch === 'rain' ? 'confetti-rain' : 'confetti-throw',
        animationDelay: `${delay}ms`,
        animationDuration: `${rand(2600, 3900)}ms`,
        ['--x1' as any]: `${x1}vw`,
        ['--y1' as any]: `${y1}vh`,
        ['--x2' as any]: `${x2}vw`,
        ['--y2' as any]: `${y2}vh`,
        ['--r1' as any]: `${spin * 0.4}deg`,
        ['--r2' as any]: `${spin}deg`,
    };
}

function buildPieces(theme: WheelTheme, big: boolean, images: UmaImage[]): Piece[] {
    if (theme === 'simple') {
        const count = big ? 170 : 80;
        return Array.from({ length: count }, (_, id) => ({
            id,
            className: 'confetti-paper',
            content: null,
            style: {
                ...launchStyle(pick(LAUNCHES)),
                width: `${rand(6, 11)}px`,
                height: `${rand(10, 18)}px`,
                background: pick(SIMPLE_COLORS),
                borderRadius: Math.random() < 0.3 ? '50%' : '2px',
            },
        }));
    }
    const count = big ? 50 : 24;
    return Array.from({ length: count }, (_, id) => {
        const roll = Math.random();
        // Samolepky se tolik netočí, ať jsou čitelné
        const base: React.CSSProperties = {
            ...launchStyle(pick(LAUNCHES)),
            ['--r1' as any]: `${rand(-25, 25)}deg`,
            ['--r2' as any]: `${rand(-40, 40)}deg`,
        };
        if (images.length && roll < 0.45) {
            const image = pick(images);
            return { id, className: `confetti-uma confetti-uma-img${image.round ? ' round' : ''}`, style: base,
                content: <img src={image.src} alt="" loading="eager" /> };
        }
        if (roll < 0.7) {
            return { id, className: 'confetti-uma confetti-uma-badge', content: pick(UMA_BADGES),
                style: { ...base, background: pick(UMA_BADGE_COLORS) } };
        }
        return { id, className: 'confetti-uma confetti-uma-emoji', style: { ...base, fontSize: `${rand(28, 52)}px` }, content: pick(UMA_EMOJI) };
    });
}

/** Salva konfet po výsledku kola štěstí, ve vzhledu podle zvoleného stylu. */
export default function WheelConfetti({ theme, burstKey, big = false }: Readonly<Props>) {
    const [characters, setCharacters] = useState<UmaCharacter[]>([]);
    const [active, setActive] = useState(false);

    useEffect(() => {
        if (theme === 'umamusume') loadUmaCharacters().then(setCharacters);
    }, [theme]);

    useEffect(() => {
        if (!burstKey) return;
        setActive(true);
        const t = setTimeout(() => setActive(false), DURATION_MS + 900);
        return () => clearTimeout(t);
    }, [burstKey]);

    const pieces = useMemo(
        () => buildPieces(theme, big, characters.flatMap(c => c.images.map(src => ({ src, round: !!c.round })))),
        // eslint-disable-next-line react-hooks/exhaustive-deps
        [burstKey],
    );

    // Při finálním výsledku „promluví" náhodná postava svou hláškou
    const speaker = useMemo(() => {
        const withQuote = characters.filter(c => c.quote);
        return theme === 'umamusume' && big && withQuote.length ? pick(withQuote) : undefined;
        // eslint-disable-next-line react-hooks/exhaustive-deps
    }, [burstKey]);

    if (!active || window.matchMedia?.('(prefers-reduced-motion: reduce)').matches) return null;

    return createPortal(
        <div className={`wheel-confetti wheel-confetti-${theme}`} key={burstKey} aria-hidden>
            {theme === 'umamusume' && big && <div className="confetti-uma-banner">🏆 1着 🏆</div>}
            {pieces.map(p => <span key={p.id} className={p.className} style={p.style}>{p.content}</span>)}
            {speaker && (
                <div className="confetti-uma-voice">
                    <img src={pick(speaker.images)} alt="" className={speaker.round ? 'round' : undefined} />
                    <div className="confetti-uma-bubble">
                        <p>„{speaker.quote}"</p>
                        <small>— {speaker.name}</small>
                    </div>
                </div>
            )}
        </div>,
        document.body,
    );
}