import React from 'react';

type Toast = { id: number; text: string; type?: 'success'|'error' };
const Ctx = React.createContext<{ push: (t: Omit<Toast,'id'>) => void } | null>(null);

export function ToastProvider({ children }: { children: React.ReactNode }) {
  const [list, setList] = React.useState<Toast[]>([]);
  const push = React.useCallback((t: Omit<Toast,'id'>) => {
    const id = Date.now() + Math.random();
    setList((arr) => [...arr, { id, ...t }]);
    setTimeout(() => setList((arr) => arr.filter((x) => x.id !== id)), 3000);
  }, []);
  React.useEffect(() => {
    const onEvt = (e: CustomEvent<Omit<Toast, 'id'>>) => push(e.detail);
    window.addEventListener('guest-toast', onEvt);
    return () => window.removeEventListener('guest-toast', onEvt);
  }, [push]);
  return (
    <Ctx.Provider value={{ push }}>
      {children}
      <div className="pointer-events-none fixed inset-x-0 bottom-4 z-50 flex justify-center px-4">
        <div className="flex w-full max-w-sm flex-col gap-2">
          {list.map((t) => (
            <div key={t.id} className={`pointer-events-auto rounded-md border p-3 shadow-sm ${t.type==='error'?'border-red-300 bg-red-50 text-red-700':'border-green-300 bg-green-50 text-green-700'}`}>
              {t.text}
            </div>
          ))}
        </div>
      </div>
    </Ctx.Provider>
  );
}

export function useToast() {
  const ctx = React.useContext(Ctx);
  if (!ctx) throw new Error('ToastProvider missing');
  return ctx;
}