MosswartOverlord/frontend/src/components/effects/RareNotification.tsx

import React, { useEffect, useState, useCallback } from 'react';
import type { RareMessage } from '../../types';

interface Props {
  recentRares: RareMessage[];
}

interface ActiveNotification {
  key: number;
  charName: string;
  rareName: string;
  exiting: boolean;
}

let notifKey = 0;

export const RareNotification: React.FC<Props> = ({ recentRares }) => {
  const [active, setActive] = useState<ActiveNotification[]>([]);
  const [lastCount, setLastCount] = useState(0);
  const [fireworks, setFireworks] = useState<Array<{ id: number; particles: Array<{ dx: number; dy: number; color: string }> }>>([]);

  // Detect new rares
  useEffect(() => {
    if (recentRares.length > lastCount && lastCount > 0) {
      const newRares = recentRares.slice(0, recentRares.length - lastCount);
      for (const r of newRares) {
        const key = ++notifKey;
        setActive(prev => [...prev, { key, charName: r.character_name, rareName: r.name, exiting: false }]);
        // Trigger fireworks
        triggerFireworks();
        // Auto-remove after 6s
        setTimeout(() => {
          setActive(prev => prev.map(n => n.key === key ? { ...n, exiting: true } : n));
          setTimeout(() => {
            setActive(prev => prev.filter(n => n.key !== key));
          }, 500);
        }, 6000);
      }
    }
    setLastCount(recentRares.length);
  }, [recentRares.length]); // eslint-disable-line react-hooks/exhaustive-deps

  const triggerFireworks = useCallback(() => {
    const id = Date.now();
    const colors = ['#FFD700', '#FF4444', '#FF8800', '#AA44FF', '#4488FF'];
    const particles = Array.from({ length: 30 }, (_, i) => {
      const angle = (Math.PI * 2 * i) / 30 + (Math.random() - 0.5) * 0.5;
      const velocity = 100 + Math.random() * 200;
      return {
        dx: Math.cos(angle) * velocity,
        dy: Math.sin(angle) * velocity - 50,
        color: colors[Math.floor(Math.random() * colors.length)],
      };
    });
    setFireworks(prev => [...prev, { id, particles }]);
    setTimeout(() => setFireworks(prev => prev.filter(f => f.id !== id)), 2200);
  }, []);

  return (
    <>
      {/* Notification banners */}
      <div className="ml-rare-notifications">
        {active.map(n => (
          <div key={n.key} className={`ml-rare-notif ${n.exiting ? 'exiting' : ''}`}>
            <div className="ml-rare-notif-title">LEGENDARY RARE!</div>
            <div className="ml-rare-notif-name">{n.rareName}</div>
            <div className="ml-rare-notif-by">found by</div>
            <div className="ml-rare-notif-char">{n.charName}</div>
          </div>
        ))}
      </div>

      {/* Fireworks particles */}
      <div className="ml-fireworks">
        {fireworks.map(fw => (
          <React.Fragment key={fw.id}>
            {fw.particles.map((p, i) => (
              <div
                key={i}
                className="ml-firework-particle"
                style={{
                  left: '50%',
                  top: '30%',
                  backgroundColor: p.color,
                  '--dx': `${p.dx}px`,
                  '--dy': `${p.dy + 200}px`,
                } as React.CSSProperties}
              />
            ))}
          </React.Fragment>
        ))}
      </div>
    </>
  );
};