const versionPattern = /^(\d+)\.(\d+)\.(\d+)(?:-beta\.(\d+))?$/;
const stableIosBuildSlot = 999;

function getNativeReleaseVersion(version) {
  const match = versionPattern.exec(version);
  if (!match) {
    throw new Error(`Cannot derive native release version from unsupported version: ${version}`);
  }

  const [, majorText, minorText, patchText, betaText] = match;
  const major = Number(majorText);
  const minor = Number(minorText);
  const patch = Number(patchText);
  const betaNumber = betaText === undefined ? null : Number(betaText);

  if (minor > 999 || patch > 999) {
    throw new Error(`Cannot derive collision-free native version from: ${version}`);
  }
  if (betaNumber !== null && (betaNumber < 1 || betaNumber >= stableIosBuildSlot)) {
    throw new Error(`iOS beta number must be between 1 and 998: ${version}`);
  }

  const versionCode = major * 1_000_000 + minor * 1_000 + patch;
  if (!Number.isSafeInteger(versionCode) || versionCode <= 0 || versionCode > 2_100_000_000) {
    throw new Error(`Derived Android versionCode is out of range: ${versionCode}`);
  }

  const iosBuildSlot = betaNumber ?? stableIosBuildSlot;
  const iosBuildNumber = versionCode * 1_000 + iosBuildSlot;
  if (!Number.isSafeInteger(iosBuildNumber)) {
    throw new Error(`Derived iOS buildNumber is out of range: ${iosBuildNumber}`);
  }

  return {
    appVersion: `${major}.${minor}.${patch}`,
    androidVersionCode: versionCode,
    iosBuildNumber: String(iosBuildNumber),
  };
}

module.exports = { getNativeReleaseVersion };