import { Reply, useArk } from "@lume/ark";
import { LoaderIcon } from "@lume/icons";
import { NDKEventWithReplies } from "@lume/types";
import { cn } from "@lume/utils";
import { NDKKind, type NDKSubscription } from "@nostr-dev-kit/ndk";
import { useEffect, useState } from "react";
import { ReplyForm } from "./editor/replyForm";

export function ReplyList({
	eventId,
	className,
}: { eventId: string; className?: string }) {
	const ark = useArk();
	const [data, setData] = useState<null | NDKEventWithReplies[]>(null);

	useEffect(() => {
		let sub: NDKSubscription = undefined;
		let isCancelled = false;

		async function fetchRepliesAndSub() {
			const id = ark.getCleanEventId(eventId);
			const events = await ark.getThreads(id);

			if (!isCancelled) {
				setData(events);
			}

			if (!sub) {
				sub = ark.subscribe({
					filter: {
						"#e": [id],
						kinds: [NDKKind.Text],
						since: Math.floor(Date.now() / 1000),
					},
					closeOnEose: false,
					cb: (event: NDKEventWithReplies) =>
						setData((prev) => [event, ...prev]),
				});
			}
		}

		// subscribe for new replies
		fetchRepliesAndSub();

		return () => {
			isCancelled = true;
			if (sub) sub.stop();
		};
	}, [eventId]);

	return (
		<div
			className={cn(
				"flex flex-col divide-y divide-neutral-100 dark:divide-neutral-900",
				className,
			)}
		>
			<ReplyForm
				eventId={eventId}
				className="py-4 border-t border-neutral-100 dark:border-neutral-900"
			/>
			{!data ? (
				<div className="mt-4 flex h-16 items-center justify-center p-3">
					<LoaderIcon className="h-5 w-5 animate-spin" />
				</div>
			) : data.length === 0 ? (
				<div className="mt-4 flex w-full items-center justify-center">
					<div className="flex flex-col items-center justify-center gap-2 py-6">
						<h3 className="text-3xl">👋</h3>
						<p className="leading-none text-neutral-600 dark:text-neutral-400">
							Be the first to Reply!
						</p>
					</div>
				</div>
			) : (
				data.map((event) => <Reply key={event.id} event={event} />)
			)}
		</div>
	);
}
