import { useEffect, useRef } from "react";
import { Button } from "~/components/ui/button";
import { Card } from "~/components/ui/card";

interface AuthRecoveryOverlayProps {
  isAuthDegraded: boolean;
}

export function AuthRecoveryOverlay({
  isAuthDegraded,
}: AuthRecoveryOverlayProps) {
  const dialogRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (!isAuthDegraded) return;
    const el = dialogRef.current;
    if (!el) return;
    const focusable = el.querySelector<HTMLElement>(
      'button:not([disabled]), [href], input:not([disabled]), [tabindex]:not([tabindex="-1"])'
    );
    focusable?.focus();

    function trapFocus(e: KeyboardEvent) {
      if (e.key !== "Tab") return;
      const focusables = el?.querySelectorAll<HTMLElement>(
        'button:not([disabled]), [href], input:not([disabled]), [tabindex]:not([tabindex="-1"])'
      );
      if (!focusables || focusables.length === 0) return;
      const first = focusables[0];
      const last = focusables[focusables.length - 1];
      if (e.shiftKey) {
        if (document.activeElement === first) { e.preventDefault(); last.focus(); }
      } else {
        if (document.activeElement === last) { e.preventDefault(); first.focus(); }
      }
    }
    document.addEventListener("keydown", trapFocus);
    return () => document.removeEventListener("keydown", trapFocus);
  }, [isAuthDegraded]);

  if (!isAuthDegraded) {
    return null;
  }

  return (
    <div
      ref={dialogRef}
      role="dialog"
      aria-modal="true"
      aria-labelledby="auth-recovery-title"
      className="fixed inset-0 bg-black/60 backdrop-blur-sm flex items-center justify-center z-[100]"
    >
      <Card className="w-full max-w-md mx-4 p-8 text-center">
        <div className="flex flex-col items-center gap-6">
          <div className="w-16 h-16 rounded-full bg-destructive/15 flex items-center justify-center">
            <svg
              className="w-8 h-8 text-destructive"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
              xmlns="http://www.w3.org/2000/svg"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2}
                d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z"
              />
            </svg>
          </div>

          <div>
            <h2 id="auth-recovery-title" className="text-2xl font-bold mb-2">Session Expired</h2>
            <p className="text-muted-foreground">
              Your session has expired. Reload the page to reconnect to the
              draft.
            </p>
          </div>

          <Button
            onClick={() => window.location.reload()}
            className="w-full"
            variant="default"
          >
            Reload Page
          </Button>
        </div>
      </Card>
    </div>
  );
}
