move the pgn viewer related logic into a hook and type the ref

src/hooks/useLichessPgnViewer.ts

@@ -0,0 +1,75 @@
+import LichessPgnViewer from "lichess-pgn-viewer";
+import { useEffect, useRef } from "react";
+import type { IPosition } from "#/interfaces.ts";
+
+type ViewerRef = ReturnType<typeof LichessPgnViewer>;
+
+interface IProps {
+	gamePgn: string;
+	handlePlyChange: ({ ply, fen }: IPosition) => void;
+}
+
+export const useLichessPgnViewer = ({ gamePgn, handlePlyChange }: IProps) => {
+	const viewerRef = useRef<ViewerRef | null>(null);
+
+	useEffect(() => {
+		const element: HTMLElement | null = document.querySelector(".lpv-board");
+		if (!element) return;
+
+		viewerRef.current = LichessPgnViewer(element, {
+			pgn: gamePgn,
+			scrollToMove: false,
+		});
+
+		const boardButtons = document.querySelectorAll(".lpv__controls");
+		const movesList = document.querySelectorAll(".lpv__moves");
+		if (!boardButtons || !movesList) return;
+
+		const clickHandlerDelay = () => {
+			setTimeout(() => handleClick(), 250);
+		};
+
+		// Hack using DOM manipulation
+		const boardEventListener = () => {
+			const variationTags = document.querySelector("variation");
+			const moves = [...document.querySelectorAll("move")].filter((m) => {
+				if (!variationTags) return m.className !== "empty";
+				return (
+					m.parentNode?.querySelector("variation") && m.className !== "empty"
+				);
+			});
+			const ply = moves.findIndex((m) => m.classList.contains("current")) + 1;
+			return { moves, ply };
+		};
+
+		const handleClick = () => {
+			const { ply } = boardEventListener();
+			const fen = viewerRef.current?.curData().fen ?? "";
+			handlePlyChange({ ply, fen });
+		};
+
+		boardButtons.forEach((button) => {
+			button.addEventListener("click", handleClick);
+			button.addEventListener("touchstart", handleClick);
+		});
+
+		movesList.forEach((move) => {
+			move.addEventListener("click", clickHandlerDelay);
+			move.addEventListener("touchstart", clickHandlerDelay);
+		});
+
+		return () => {
+			boardButtons.forEach((button) => {
+				button.removeEventListener("click", handleClick);
+				button.removeEventListener("touchstart", handleClick);
+			});
+
+			movesList.forEach((move) => {
+				move.removeEventListener("click", clickHandlerDelay);
+				move.removeEventListener("touchstart", clickHandlerDelay);
+			});
+		};
+	}, [gamePgn, handlePlyChange]);
+
+	return viewerRef;
+};