"use client";

import { useCallback, useEffect, useState } from "react";

/**
 * Client-side photo gallery for the public Photos page. Renders the same
 * card grid as before, but each tile is now a button that opens the photo in
 * a full-screen lightbox overlay. The overlay is a fixed, full-viewport layer
 * toggled by state — closes on backdrop click, on the ✕ button, or with Esc.
 *
 * Photos are pre-shaped on the server (caption strings already translated) so
 * this component carries no prisma/i18n dependency.
 */
export type LightboxPhoto = {
  id: string;
  url: string;
  alt: string;
  date: string;
  user: string;
};

export function PhotoLightbox({ photos }: { photos: LightboxPhoto[] }) {
  // Index of the photo shown in the lightbox, or null when closed.
  const [openIndex, setOpenIndex] = useState<number | null>(null);
  // eslint-disable-next-line security/detect-object-injection -- openIndex is numeric array index, guarded by null check
  const active = openIndex !== null ? photos[openIndex] : null;

  const close = useCallback(() => setOpenIndex(null), []);

  // Esc-to-close + lock background scroll while the overlay is open.
  useEffect(() => {
    if (active == null) return;
    function onKey(e: KeyboardEvent) {
      if (e.key === "Escape") close();
    }
    document.addEventListener("keydown", onKey);
    const prevOverflow = document.body.style.overflow;
    document.body.style.overflow = "hidden";
    return () => {
      document.removeEventListener("keydown", onKey);
      document.body.style.overflow = prevOverflow;
    };
  }, [active, close]);

  return (
    <>
      <div className="card-grid sm-2 md-3 lg-4" style={{ padding: "1rem" }}>
        {photos.map((p, i) => (
          <button
            key={p.id}
            type="button"
            onClick={() => setOpenIndex(i)}
            className="card hover"
            style={{
              padding: 0,
              overflow: "hidden",
              border: 0,
              background: "var(--color-surface)",
              cursor: "zoom-in",
              textAlign: "left",
              font: "inherit",
              color: "inherit",
              display: "block",
              width: "100%",
            }}
            aria-label={p.alt}
          >
            {/* eslint-disable-next-line @next/next/no-img-element */}
            <img src={p.url} alt={p.alt} style={{ width: "100%", height: "auto", display: "block" }} />
            <div style={{ padding: "0.7rem 0.85rem" }}>
              <p className="muted" style={{ margin: 0, fontSize: "0.85rem" }}>
                {p.date}
              </p>
              <p className="muted" style={{ margin: 0, fontSize: "0.85rem" }}>
                {p.user}
              </p>
            </div>
          </button>
        ))}
      </div>

      {active ? (
        <div
          onClick={close}
          role="dialog"
          aria-modal="true"
          aria-label={active.alt}
          style={{
            position: "fixed",
            inset: 0,
            zIndex: 1000,
            display: "flex",
            alignItems: "center",
            justifyContent: "center",
            padding: "1.5rem",
            background: "rgba(0, 0, 0, 0.82)",
            backdropFilter: "blur(8px)",
            cursor: "zoom-out",
          }}
        >
          <button
            type="button"
            onClick={close}
            aria-label="Close"
            style={{
              position: "absolute",
              top: "1rem",
              right: "1rem",
              width: "2.5rem",
              height: "2.5rem",
              borderRadius: "999px",
              border: 0,
              background: "rgba(255, 255, 255, 0.16)",
              color: "#fff",
              fontSize: "1.4rem",
              lineHeight: 1,
              cursor: "pointer",
            }}
          >
            ✕
          </button>
          {/* Stop propagation so clicking the image itself doesn't close. */}
          <figure
            onClick={(e) => e.stopPropagation()}
            style={{
              margin: 0,
              maxWidth: "min(92vw, 1100px)",
              maxHeight: "90vh",
              display: "flex",
              flexDirection: "column",
              alignItems: "center",
              gap: "0.75rem",
              cursor: "default",
            }}
          >
            {/* eslint-disable-next-line @next/next/no-img-element */}
            <img
              src={active.url}
              alt={active.alt}
              style={{
                maxWidth: "100%",
                maxHeight: "78vh",
                width: "auto",
                height: "auto",
                display: "block",
                borderRadius: "var(--radius-md)",
                boxShadow: "var(--shadow-card-hover)",
              }}
            />
            <figcaption
              style={{
                color: "rgba(255, 255, 255, 0.85)",
                fontSize: "0.9rem",
                textAlign: "center",
              }}
            >
              {active.date} · {active.user}
            </figcaption>
          </figure>
        </div>
      ) : null}
    </>
  );
}