"use client";

import { useEffect, useRef } from "react";
import { AnimatePresence, motion } from "motion/react";
import { VersandSections } from "../versand/components/VersandSections";
import type { ShippingSettings } from "../lib/payload";

/**
 * Quick-reference version of /versand, opened from the cart's order
 * summary "Versand" info link — a full page navigation would pull you out
 * of checkout, which is exactly what the link is there to avoid. Reuses
 * VersandSections so the two never carry different numbers/copy.
 * `shipping` is threaded down from CartContent/CheckoutContent's own page
 * (a Server Component), not fetched here — this is a Client Component.
 */
export function VersandModal({
  open,
  onClose,
  shipping,
  shippingCost,
  freeShippingThreshold,
}: {
  open: boolean;
  onClose: () => void;
  shipping: ShippingSettings;
  shippingCost: number;
  freeShippingThreshold: number | null;
}) {
  const dialogRef = useRef<HTMLDivElement>(null);
  const closeButtonRef = useRef<HTMLButtonElement>(null);

  useEffect(() => {
    if (!open) return;
    const prevOverflow = document.body.style.overflow;
    document.body.style.overflow = "hidden";
    return () => {
      document.body.style.overflow = prevOverflow;
    };
  }, [open]);

  useEffect(() => {
    if (!open) return;

    closeButtonRef.current?.focus({ preventScroll: true });

    const onKeyDown = (e: KeyboardEvent) => {
      if (e.key === "Escape") {
        e.preventDefault();
        onClose();
        return;
      }
      if (e.key !== "Tab") return;
      const focusables = dialogRef.current?.querySelectorAll<HTMLElement>(
        'a[href], button:not([disabled])'
      );
      if (!focusables || focusables.length === 0) return;
      const first = focusables[0];
      const last = focusables[focusables.length - 1];
      if (e.shiftKey && document.activeElement === first) {
        e.preventDefault();
        last.focus({ preventScroll: true });
      } else if (!e.shiftKey && document.activeElement === last) {
        e.preventDefault();
        first.focus({ preventScroll: true });
      }
    };

    document.addEventListener("keydown", onKeyDown);
    return () => document.removeEventListener("keydown", onKeyDown);
  }, [open, onClose]);

  return (
    <AnimatePresence>
      {open && (
        <motion.div
          className="fixed inset-0 z-[60] flex items-center justify-center p-4 md:p-8 bg-[rgba(134,134,134,0.9)]"
          initial={{ opacity: 0 }}
          animate={{ opacity: 1 }}
          exit={{ opacity: 0 }}
          transition={{ duration: 0.25, ease: "easeOut" }}
          onClick={(e) => {
            if (e.target === e.currentTarget) onClose();
          }}
        >
          <motion.div
            ref={dialogRef}
            role="dialog"
            aria-modal="true"
            aria-labelledby="versand-modal-heading"
            initial={{ opacity: 0, y: 16, scale: 0.97 }}
            animate={{ opacity: 1, y: 0, scale: 1 }}
            exit={{ opacity: 0, y: 16, scale: 0.97 }}
            transition={{ duration: 0.3, ease: [0.22, 1, 0.36, 1] }}
            className="relative bg-bg-base rounded-md overflow-hidden w-full max-w-[40rem] max-h-[85vh] overflow-y-auto"
          >
            <div className="sticky top-0 z-10 flex items-center justify-between px-8 py-6 bg-bg-base border-b border-border">
              <p
                id="versand-modal-heading"
                className="font-semibold text-h-small text-text-primary"
                style={{ fontFamily: "var(--font-lora)" }}
              >
                Versand
              </p>
              <button
                ref={closeButtonRef}
                type="button"
                onClick={onClose}
                aria-label="Schließen"
                className="size-6 flex items-center justify-center active:scale-90 transition-transform text-text-muted hover:text-text-primary"
              >
                <span aria-hidden className="text-2xl leading-none">×</span>
              </button>
            </div>

            <div className="px-8 py-6 pb-8">
              <VersandSections shipping={shipping} shippingCost={shippingCost} freeShippingThreshold={freeShippingThreshold} />
            </div>
          </motion.div>
        </motion.div>
      )}
    </AnimatePresence>
  );
}
