const path = require("path");
const execSync = require("child_process").execSync;
const jsonfile = require("jsonfile");
const semver = require("semver");

const rootDir = path.resolve(__dirname, "..");
const version = process.argv[2];

/**
 * @param {*} cond
 * @param {string} message
 * @returns {asserts cond}
 */
function invariant(cond, message) {
  if (!cond) throw new Error(message);
}

/**
 * @param {string} packageName
 * @param {string|number} version
 */
async function ensureBuildVersion(packageName, version) {
  let file = path.join(rootDir, "packages", packageName, "package.json");
  let json = await jsonfile.readFile(file);
  invariant(
    semver.compare(json.version, version) === 0,
    `Package ${packageName} is on version ${json.version}, but should be on ${version}`
  );
}

/**
 * @param {string} packageName
 * @param {string|null} tag
 */
function publishBuild(packageName, tag) {
  let buildDir = path.join(rootDir, "packages", packageName);
  let command = `npm publish ${buildDir}` + (tag ? ` --tag ${tag}` : "");
  console.log();
  console.log(`  ${command}`);
  console.log();
  execSync(command, { stdio: "inherit" });
}

/**
 * @returns {Promise<1 | 0>}
 */
async function run() {
  try {
    // 0. Ensure we are in CI. We don't do this manually
    invariant(
      process.env.CI,
      `You should always run the publish script from the CI environment!`
    );

    // 1. Get the current tag, which has the release version number
    invariant(
      version !== "",
      "Missing release version. Run the version script first."
    );

    // 2. Determine the appropriate npm tag to use
    let tag =
      semver.prerelease(version) == null && semver.compare(version, "6.0.0") > 0
        ? "latest"
        : "classic";

    console.log();
    console.log(
      `  Publishing version ${version} to npm` +
        (tag ? ` with tag "${tag}"` : "")
    );

    // 3. Ensure build versions match the release version
    await ensureBuildVersion("react-router", version);
    await ensureBuildVersion("react-router-dom", version);
    await ensureBuildVersion("react-router-native", version);

    // 4. Publish to npm
    publishBuild("react-router", tag);
    publishBuild("react-router-dom", tag);
    publishBuild("react-router-native", tag);
  } catch (error) {
    console.log();
    console.error(`  ${error.message}`);
    console.log();
    return 1;
  }

  return 0;
}

run()
  .then(code => {
    process.exit(code);
  })
  .catch(error => {
    console.error(error);
    process.exit(1);
  });