const BUILTIN_CLIENT_ID = 'C720341c19d8dfb4cab8a5db78be4bc6d5c3983fbe84df94be34c8aa69a695583'
const BUILTIN_CLIENT_SECRET = 'e90806657443a7f16093c0846690aeeea96cd2b3ed9b79cf544297c526b4f9af'

export interface WebexAppCredentials {
  clientId: string
  clientSecret: string
  source: 'env' | 'builtin'
}

function parseTrimmed(value: string | undefined): string | undefined {
  const normalized = value?.trim()
  return normalized ? normalized : undefined
}

export function getWebexAppCredentials(): WebexAppCredentials {
  const envClientId = parseTrimmed(process.env.AGENT_WEBEX_CLIENT_ID)
  const envClientSecret = parseTrimmed(process.env.AGENT_WEBEX_CLIENT_SECRET)

  if (envClientId && envClientSecret) {
    return { clientId: envClientId, clientSecret: envClientSecret, source: 'env' }
  }

  const legacyClientId = parseTrimmed(process.env.AGENT_MESSENGER_WEBEX_CLIENT_ID)
  const legacyClientSecret = parseTrimmed(process.env.AGENT_MESSENGER_WEBEX_CLIENT_SECRET)

  if (legacyClientId && legacyClientSecret) {
    return { clientId: legacyClientId, clientSecret: legacyClientSecret, source: 'env' }
  }

  return { clientId: BUILTIN_CLIENT_ID, clientSecret: BUILTIN_CLIENT_SECRET, source: 'builtin' }
}