export type DeeplineRuntimeEnv = 'prod' | 'dev';

function normalizeEnvToken(value: string): DeeplineRuntimeEnv | null {
  const token = value.trim().toLowerCase();
  if (!token) return null;

  if (
    token === 'prod' ||
    token === 'production' ||
    token === 'live' ||
    token.startsWith('prod-')
  ) {
    return 'prod';
  }

  if (
    token === 'dev' ||
    token === 'development' ||
    token === 'local' ||
    token === 'preview' ||
    token === 'staging' ||
    token === 'stage' ||
    token === 'test' ||
    token.startsWith('dev-')
  ) {
    return 'dev';
  }

  return null;
}

export function getRuntimeEnv(): DeeplineRuntimeEnv {
  const explicit = normalizeEnvToken(process.env.DEEPLINE_ENV ?? '');
  if (explicit) return explicit;

  const convexDeployment = String(process.env.CONVEX_DEPLOYMENT ?? '')
    .trim()
    .toLowerCase();
  if (convexDeployment.startsWith('prod:')) return 'prod';
  if (convexDeployment.startsWith('dev:')) return 'dev';

  const vercelEnv = normalizeEnvToken(process.env.VERCEL_ENV ?? '');
  if (vercelEnv) return vercelEnv;

  return process.env.NODE_ENV === 'production' ? 'prod' : 'dev';
}

export function getRuntimeEnvInfo() {
  return {
    env: getRuntimeEnv(),
    deepline_env: process.env.DEEPLINE_ENV ?? null,
    convex_deployment: process.env.CONVEX_DEPLOYMENT ?? null,
    node_env: process.env.NODE_ENV ?? null,
  };
}