import { readEnvFile } from '../src/env.js';
import { logger } from '../src/logger.js';

type BastilleRunner = (args: string[]) => { ok: boolean; output: string };

interface TailscaleConfig {
  enabled: boolean;
  authKey: string;
}

function parseYes(value?: string): boolean {
  return /^(YES|yes|true|TRUE|1)$/u.test(value || '');
}

function loadTailscaleConfig(): TailscaleConfig {
  const envValues = readEnvFile(['FEATURE_TAILSCALE', 'TAILSCALE_AUTHKEY']);
  const enabled = parseYes(process.env.FEATURE_TAILSCALE || envValues.FEATURE_TAILSCALE);
  const authKey = process.env.TAILSCALE_AUTHKEY || envValues.TAILSCALE_AUTHKEY || '';
  return { enabled, authKey };
}

function normalizeHostname(value: string): string {
  const cleaned = value.toLowerCase().replace(/[^a-z0-9-]/gu, '');
  return cleaned || 'clawdie';
}

export function maybeEnableTailscaleInJail(
  runBastille: BastilleRunner,
  jailName: string,
  hostnameHint: string,
): void {
  const config = loadTailscaleConfig();
  if (!config.enabled) return;

  if (!config.authKey) {
    logger.warn({ jailName }, 'Tailscale enabled but no auth key; skipping jail login');
    return;
  }

  const hostname = normalizeHostname(hostnameHint || jailName);

  const pkg = runBastille(['pkg', jailName, 'install', '-y', 'tailscale']);
  if (!pkg.ok) {
    logger.warn({ jailName }, 'Tailscale package install failed in jail (skipping)');
    return;
  }

  const sysrc = runBastille(['cmd', jailName, 'sysrc', 'tailscaled_enable=YES']);
  if (!sysrc.ok) {
    logger.warn({ jailName }, 'Tailscale sysrc enable failed in jail');
  }

  const start = runBastille(['service', jailName, 'tailscaled', 'restart']);
  if (!start.ok) {
    logger.warn({ jailName }, 'Tailscale service start failed in jail');
  }

  const up = runBastille([
    'cmd',
    jailName,
    'tailscale',
    'up',
    '--authkey',
    config.authKey,
    '--hostname',
    hostname,
  ]);
  if (!up.ok) {
    logger.warn({ jailName }, 'Tailscale up failed in jail (check jail logs)');
    return;
  }

  logger.info({ jailName, hostname }, 'Tailscale enabled in jail');
}