Source

// Small shared pieces: modal sheet, toast, copy-to-clipboard, file download.
import { useEffect, useRef, useState, type ReactNode } from "react";

export function Modal({ title, onClose, children, footer }: { title: string; onClose: () => void; children: ReactNode; footer?: ReactNode }) {
  const ref = useRef<HTMLDivElement>(null);
  useEffect(() => {
    const prev = document.activeElement as HTMLElement | null;
    const onKey = (e: KeyboardEvent) => { if (e.key === "Escape") onClose(); };
    document.addEventListener("keydown", onKey);
    document.body.style.overflow = "hidden";
    ref.current?.querySelector<HTMLElement>("[autofocus], input, select, textarea, button")?.focus();
    return () => {
      document.removeEventListener("keydown", onKey);
      document.body.style.overflow = "";
      prev?.focus();
    };
  }, [onClose]);
  return (
    <div className="modal-backdrop" onMouseDown={(e) => { if (e.target === e.currentTarget) onClose(); }}>
      <div className="modal" role="dialog" aria-modal="true" aria-label={title} ref={ref}>
        <div className="modal-head">
          <h2 className="modal-title">{title}</h2>
          <button className="icon-btn" type="button" onClick={onClose} aria-label="Close">
            <svg width="18" height="18" viewBox="0 0 20 20" aria-hidden="true"><path d="M5 5l10 10M15 5 5 15" stroke="currentColor" strokeWidth="1.7" strokeLinecap="round" /></svg>
          </button>
        </div>
        <div className="modal-body">{children}</div>
        {footer && <div className="modal-foot">{footer}</div>}
      </div>
    </div>
  );
}

let pushToast: ((text: string) => void) | null = null;
export function toast(text: string) { pushToast?.(text); }

export function Toaster() {
  const [text, setText] = useState<string | null>(null);
  useEffect(() => {
    let timer: number | undefined;
    pushToast = (t) => {
      setText(t);
      window.clearTimeout(timer);
      timer = window.setTimeout(() => setText(null), 2600);
    };
    return () => { pushToast = null; window.clearTimeout(timer); };
  }, []);
  return text ? <div className="toast" role="status">{text}</div> : null;
}

export async function copy(text: string, done = "Copied") {
  try {
    await navigator.clipboard.writeText(text);
    toast(done);
  } catch {
    window.prompt("Copy this:", text);
  }
}

export async function share(url: string, title: string) {
  if (navigator.share && matchMedia("(pointer: coarse)").matches) {
    try { await navigator.share({ title, url }); return; } catch { /* cancelled */ }
  }
  await copy(url, "Link copied. Send it to the group.");
}

/** Saves text as a file, like a calendar invite. */
export function download(name: string, text: string, type: string) {
  const url = URL.createObjectURL(new Blob([text], { type }));
  const a = Object.assign(document.createElement("a"), { href: url, download: name });
  document.body.appendChild(a);
  a.click();
  a.remove();
  setTimeout(() => URL.revokeObjectURL(url), 1000);
}