"use client";

import { AnimatePresence, motion } from "motion/react";
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 db/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>

			<AnimatePresence>
				{active ? (
					<motion.div
						key="lightbox"
						onClick={(e) => {
							if (e.target === e.currentTarget) close();
						}}
						role="dialog"
						aria-modal="true"
						aria-label={active.alt}
						initial={{ opacity: 0 }}
						animate={{ opacity: 1 }}
						exit={{ opacity: 0 }}
						transition={{ duration: 0.2 }}
						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>
						{/* Clicking the dialog backdrop (not the figure) closes the lightbox. */}
						<figure
							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)",
									scale: active ? "1" : "0.95",
								}}
							/>
							<figcaption
								style={{
									color: "rgba(255, 255, 255, 0.85)",
									fontSize: "0.9rem",
									textAlign: "center",
								}}
							>
								{active.date} · {active.user}
							</figcaption>
						</figure>
					</motion.div>
				) : null}
			</AnimatePresence>
		</>
	);
}