const cp = require("child_process");
const path = require("path");
const fs = require("fs");

const [major, minor] = process.versions.node.split(".").map(n => +n);

if (major > 12 || (major === 12 && minor >= 17)) {
  test("ESM", "--experimental-modules ./src/main-esm.mjs", "expected-esm.txt");
  // TODO: This never worked in any Babel version
  // test("ESM - absoluteRuntime", "--esperimental-modules ./src/absolute/main-esm.mjs", "expected-esm-absolute.txt");
}

const expectedCjs =
  major === 10 || (major === 12 && minor < 12.17)
    ? "expected-cjs-10.txt"
    : "expected-cjs.txt";

test("CJS", "./src/main-cjs.cjs", expectedCjs);

const expectedCjsAbsolute =
  major === 10 || (major === 12 && minor < 12.17)
    ? "expected-cjs-absolute-10.txt"
    : major === 13 && minor <= 1
    ? "expected-cjs-absolute-13.0.txt"
    : "expected-cjs-absolute.txt";

test(
  "CJS - absoluteRuntime",
  "./src/absolute/main-cjs.cjs",
  expectedCjsAbsolute
);

function test(title, command, expectedName) {
  const expectedPath = path.join(__dirname, expectedName);
  const expected = fs.readFileSync(expectedPath, "utf8");

  console.log(`Testing with Node.js ${process.version} - ${title}`);
  const out = normalize(
    cp.execSync(`node ${command}`, {
      cwd: __dirname,
      encoding: "utf8",
    })
  );

  if (expected === out) {
    console.log("OK");
  } else if (process.env.OVERWRITE) {
    fs.writeFileSync(expectedPath, out);
    console.log("UPDATED");
  } else {
    console.error("FAILED\n\n");
    console.error(out);
    process.exitCode = 1;
  }
  console.log("\n");
}

function normalize(output) {
  const root = path.resolve(__dirname, "../..");
  let next;
  while ((next = output.replace(root, "<ROOT>")) !== output) {
    output = next;
  }
  return output;
}