import { S3Client } from '@aws-sdk/client-s3'
import { NodeHttpHandler } from '@aws-sdk/node-http-handler'
import { logger } from '@server/helpers/logger'
import { isProxyEnabled } from '@server/helpers/proxy'
import { getAgent } from '@server/helpers/requests'
import { CONFIG } from '@server/initializers/config'
import { lTags } from './logger'

function getProxyRequestHandler () {
  if (!isProxyEnabled()) return null

  const { agent } = getAgent()

  return new NodeHttpHandler({
    httpAgent: agent.http,
    httpsAgent: agent.https
  })
}

let endpointParsed: URL
function getEndpointParsed () {
  if (endpointParsed) return endpointParsed

  endpointParsed = new URL(getEndpoint())

  return endpointParsed
}

let s3Client: S3Client
function getClient () {
  if (s3Client) return s3Client

  const OBJECT_STORAGE = CONFIG.OBJECT_STORAGE

  s3Client = new S3Client({
    endpoint: getEndpoint(),
    region: OBJECT_STORAGE.REGION,
    credentials: OBJECT_STORAGE.CREDENTIALS.ACCESS_KEY_ID
      ? {
        accessKeyId: OBJECT_STORAGE.CREDENTIALS.ACCESS_KEY_ID,
        secretAccessKey: OBJECT_STORAGE.CREDENTIALS.SECRET_ACCESS_KEY
      }
      : undefined,
    requestHandler: getProxyRequestHandler()
  })

  logger.info('Initialized S3 client %s with region %s.', getEndpoint(), OBJECT_STORAGE.REGION, lTags())

  return s3Client
}

// ---------------------------------------------------------------------------

export {
  getEndpointParsed,
  getClient
}

// ---------------------------------------------------------------------------

let endpoint: string
function getEndpoint () {
  if (endpoint) return endpoint

  const endpointConfig = CONFIG.OBJECT_STORAGE.ENDPOINT
  endpoint = endpointConfig.startsWith('http://') || endpointConfig.startsWith('https://')
    ? CONFIG.OBJECT_STORAGE.ENDPOINT
    : 'https://' + CONFIG.OBJECT_STORAGE.ENDPOINT

  return endpoint
}