function required(name: string) {
  const value = process.env[name]?.trim()
  if (!value) throw new Error(`Missing required environment variable ${name}`)
  return value
}

function list(name: string, fallback: string[]) {
  const raw = process.env[name]?.trim()
  if (!raw) return fallback
  return [...new Set(raw.split(',').map((value) => value.trim()).filter(Boolean))]
}

const desktopClientId = process.env.KEYCLOAK_DESKTOP_CLIENT_ID?.trim() || 'fieldlens-print'

export const config = {
  port: Number(process.env.PORT ?? '3000'),
  databaseUrl: required('DATABASE_URL'),
  issuer: required('KEYCLOAK_ISSUER').replace(/\/$/, ''),
  jwksUri: (process.env.KEYCLOAK_JWKS_URI ?? '').trim(),
  audience: process.env.KEYCLOAK_AUDIENCE?.trim() || 'fieldlens-api',
  browserClientId: process.env.KEYCLOAK_BROWSER_CLIENT_ID?.trim() || 'fieldlens',
  desktopClientId,
  desktopClientIds: list('KEYCLOAK_DESKTOP_CLIENT_IDS', [
    desktopClientId,
    'fieldlens-print-desktop',
  ]),
  machineClientId: process.env.KEYCLOAK_MACHINE_CLIENT_ID?.trim() || 'fieldlens-integration',
  tenantId: process.env.FIELDLENS_TENANT_ID?.trim() || 'fieldlens-production',
  environment: process.env.FIELDLENS_ENV?.trim() || 'development',
  logLevel: process.env.LOG_LEVEL?.trim() || 'info',
  webOrigin: process.env.WEB_ORIGIN?.trim() || 'http://localhost:5173',
  staticDir: process.env.STATIC_DIR?.trim() || '',
  desktopDownloadBaseUrl: process.env.FIELDLENS_DESKTOP_DOWNLOAD_BASE_URL?.trim() || 'https://fieldlens-desktop-build.arrowstack.dev',
  linuxDesktopDownloadBaseUrl: process.env.FIELDLENS_LINUX_DESKTOP_DOWNLOAD_BASE_URL?.trim() || process.env.FIELDLENS_DESKTOP_DOWNLOAD_BASE_URL?.trim() || 'https://fieldlens-desktop-build.arrowstack.dev',
}