import debug from 'debug';
import packageJson from '@@/package.json';

export const RELEASE = 'v' + packageJson.version;

export const SERVER_DEBUG = debug('Server');

export const OLD_ENV = {
  /** @deprecated Only for migration purposes */
  PASSWORD: process.env.PASSWORD,
  /** @deprecated Only for migration purposes */
  PASSWORD_HASH: process.env.PASSWORD_HASH,
};

export const WG_ENV = {
  /** UI is hosted on HTTP instead of HTTPS */
  INSECURE: process.env.INSECURE === 'true',
  /** Port the UI is listening on */
  PORT: assertEnv('PORT'),
  /** If IPv6 should be disabled */
  DISABLE_IPV6: process.env.DISABLE_IPV6 === 'true',
};

export const WG_INITIAL_ENV = {
  ENABLED: process.env.INIT_ENABLED === 'true',
  USERNAME: process.env.INIT_USERNAME,
  PASSWORD: process.env.INIT_PASSWORD,
  DNS: process.env.INIT_DNS?.split(',').map((x) => x.trim()),
  IPV4_CIDR: process.env.INIT_IPV4_CIDR,
  IPV6_CIDR: process.env.INIT_IPV6_CIDR,
  HOST: process.env.INIT_HOST,
  PORT: process.env.INIT_PORT
    ? Number.parseInt(process.env.INIT_PORT, 10)
    : undefined,
};

function assertEnv<T extends string>(env: T) {
  const val = process.env[env];

  if (!val) {
    throw new Error(`Missing environment variable: ${env}`);
  }

  return val;
}