import { PlatformConstants } from 'react-native';

export function getReactNativeVersionWithModules(
  constants: PlatformConstants
): string | null {
  try {
    // dodge some bullets
    if (!constants) {
      return null;
    }
    if (!constants.reactNativeVersion) {
      return null;
    }

    // grab the raw numbers
    const major = constants.reactNativeVersion.major;
    const minor = constants.reactNativeVersion.minor;
    const patch = constants.reactNativeVersion.patch;
    const prerelease = constants.reactNativeVersion.prerelease;

    // check the major or jet
    if (typeof major !== 'number') {
      return null;
    }

    // assemble!
    const vParts = [];
    vParts.push(`${major}.${minor}.${patch}`);
    if (prerelease) {
      vParts.push(`-${prerelease}`);
    }

    return vParts.join('');
  } catch {}

  return null;
}