import os from 'os'
import {info} from '@actions/core'

// Used for controlling the highWaterMark value of the zip that is being streamed
// The same value is used as the chunk size that is use during upload to blob storage
export function getUploadChunkSize(): number {
  return 8 * 1024 * 1024 // 8 MB Chunks
}

export function getRuntimeToken(): string {
  const token = process.env['ACTIONS_RUNTIME_TOKEN']
  if (!token) {
    throw new Error('Unable to get the ACTIONS_RUNTIME_TOKEN env variable')
  }
  return token
}

export function getResultsServiceUrl(): string {
  const resultsUrl = process.env['ACTIONS_RESULTS_URL']
  if (!resultsUrl) {
    throw new Error('Unable to get the ACTIONS_RESULTS_URL env variable')
  }

  return new URL(resultsUrl).origin
}

export function isGhes(): boolean {
  const ghUrl = new URL(
    process.env['GITHUB_SERVER_URL'] || 'https://github.com'
  )

  const hostname = ghUrl.hostname.trimEnd().toUpperCase()
  const isGitHubHost = hostname === 'GITHUB.COM'
  const isGheHost = hostname.endsWith('.GHE.COM')
  const isLocalHost = hostname.endsWith('.LOCALHOST')

  return !isGitHubHost && !isGheHost && !isLocalHost
}

export function getGitHubWorkspaceDir(): string {
  const ghWorkspaceDir = process.env['GITHUB_WORKSPACE']
  if (!ghWorkspaceDir) {
    throw new Error('Unable to get the GITHUB_WORKSPACE env variable')
  }
  return ghWorkspaceDir
}

// The maximum value of concurrency is 300.
// This value can be changed with ACTIONS_ARTIFACT_UPLOAD_CONCURRENCY variable.
export function getConcurrency(): number {
  const numCPUs = os.cpus().length
  let concurrencyCap = 32

  if (numCPUs > 4) {
    const concurrency = 16 * numCPUs
    concurrencyCap = concurrency > 300 ? 300 : concurrency
  }

  const concurrencyOverride = process.env['ACTIONS_ARTIFACT_UPLOAD_CONCURRENCY']
  if (concurrencyOverride) {
    const concurrency = parseInt(concurrencyOverride)
    if (isNaN(concurrency) || concurrency < 1) {
      throw new Error(
        'Invalid value set for ACTIONS_ARTIFACT_UPLOAD_CONCURRENCY env variable'
      )
    }

    if (concurrency < concurrencyCap) {
      info(
        `Set concurrency based on the value set in ACTIONS_ARTIFACT_UPLOAD_CONCURRENCY.`
      )
      return concurrency
    }

    info(
      `ACTIONS_ARTIFACT_UPLOAD_CONCURRENCY is higher than the cap of ${concurrencyCap} based on the number of cpus. Set it to the maximum value allowed.`
    )
    return concurrencyCap
  }

  // default concurrency to 5
  return 5
}

export function getUploadChunkTimeout(): number {
  const timeoutVar = process.env['ACTIONS_ARTIFACT_UPLOAD_TIMEOUT_MS']
  if (!timeoutVar) {
    return 300000 // 5 minutes
  }

  const timeout = parseInt(timeoutVar)
  if (isNaN(timeout)) {
    throw new Error(
      'Invalid value set for ACTIONS_ARTIFACT_UPLOAD_TIMEOUT_MS env variable'
    )
  }

  return timeout
}

// This value can be changed with ACTIONS_ARTIFACT_MAX_ARTIFACT_COUNT variable.
// Defaults to 1000 as a safeguard for rate limiting.
export function getMaxArtifactListCount(): number {
  const maxCountVar =
    process.env['ACTIONS_ARTIFACT_MAX_ARTIFACT_COUNT'] || '1000'

  const maxCount = parseInt(maxCountVar)
  if (isNaN(maxCount) || maxCount < 1) {
    throw new Error(
      'Invalid value set for ACTIONS_ARTIFACT_MAX_ARTIFACT_COUNT env variable'
    )
  }

  return maxCount
}