function getBoardFen() {
  let fen = "";
  for (let i = 8; i >= 1; i--) {
    for (let j = 1; j <= 8; j++) {
      if (j === 1 && i !== 8) fen += "/";

      let classes = document.querySelectorAll(`.piece.square-${j}${i}`)[0]?.classList ?? null;
      let piece = null;
      if (classes) {
        for (let cls of classes.values()) {
          if (cls.length === 2) piece = cls;
        }
      }

      if (piece === null) {
        let last = fen.slice(-1);
        fen = (!isNaN(Number(last)) && last !== "")
          ? fen.slice(0, -1) + (Number(last) + 1)
          : fen + "1";
      } else if (piece[0] === "b") {
        fen += piece[1];
      } else {
        fen += piece[1].toUpperCase();
      }
    }
  }
  return fen;
}

function getPlayerColour() {
  const board = document.querySelector("wc-chess-board");
  return board?.classList.contains("flipped") ? "b" : "w";
}