undo.js

const { SlashCommandBuilder } = require("discord.js");
const {
  clearInactiveTimer,
  deleteLastTurn,
  drawBoard,
  getGameData,
  getTheme,
  getTurnMessage,
  isGameOngoing,
  isPlayer,
  sendMessage,
  sendPngToDiscord,
  setInactiveTimer,
} = require("../util");

module.exports = {
  data: new SlashCommandBuilder()
    .setName("undo")
    .setDescription("Undo your previous move."),
  async execute(interaction) {
    let gameData = getGameData(interaction);
    if (!gameData) {
      return sendMessage(interaction, "This isn't a game channel.", true);
    }

    if (!gameData.hl) {
      return sendMessage(interaction, "There's nothing to undo.", true);
    }

    if (!isGameOngoing(interaction)) {
      return sendMessage(
        interaction,
        "The game is over, but you can start a new game using the `tps` option to resume from the last position!",
        true
      );
    }

    if (!isPlayer(interaction.member.id, gameData)) {
      return sendMessage(interaction, "This isn't your game.", true);
    }

    if (
      (gameData.turnMarker === "1" &&
        interaction.member.id != gameData.player2Id) ||
      (gameData.turnMarker === "2" &&
        interaction.member.id != gameData.player1Id)
    ) {
      return sendMessage(
        interaction,
        "You cannot undo your opponent's move.",
        true
      );
    }

    deleteLastTurn(interaction, gameData);
    gameData = getGameData(interaction);
    const canvas = drawBoard(gameData, getTheme(interaction));
    const message = "Undo complete!\n" + getTurnMessage(gameData, canvas);

    clearInactiveTimer(interaction);
    setInactiveTimer(interaction, gameData, canvas);

    return sendPngToDiscord(interaction, canvas, message);
  },
};