import fs from "fs/promises";
import { fileExists } from "./files";

export const dockerfileExists = async () => {
  return await fileExists("Dockerfile");
};

export const getDockerfilePort = async () => {
  let detectedPort = null;

  if (!(await dockerfileExists())) {
    return detectedPort;
  }

  const dockerfile = await fs.readFile("Dockerfile", "utf8");
  const match = dockerfile.match(/EXPOSE (\d+)/);
  if (match) {
    detectedPort = parseInt(match[1]);
  }

  return detectedPort;
};