start-os/ui/src/app/util/package-loading-progress.ts

import { InstallProgress } from 'src/app/services/patch-db/data-model'

export function packageLoadingProgress (
  loadData: InstallProgress,
): ProgressData {
  let {
    downloaded,
    validated,
    unpacked,
    size,
    'download-complete': downloadComplete,
    'validation-complete': validationComplete,
    'unpack-complete': unpackComplete,
  } = loadData

  // only permit 100% when "complete" == true
  downloaded = downloadComplete ? size : Math.max(downloaded - 1, 0)
  validated = validationComplete ? size : Math.max(validated - 1, 0)
  unpacked = unpackComplete ? size : Math.max(unpacked - 1, 0)

  const downloadWeight = 1
  const validateWeight = 0.2
  const unpackWeight = 0.7

  const numerator = Math.floor(
    downloadWeight * downloaded +
      validateWeight * validated +
      unpackWeight * unpacked,
  )

  const denominator = Math.floor(
    size * (downloadWeight + validateWeight + unpackWeight),
  )
  const totalProgress = Math.floor(100 * numerator / denominator)
  return {
    totalProgress,
    downloadProgress: Math.floor((100 * downloaded) / size),
    validateProgress: Math.floor((100 * validated) / size),
    unpackProgress: Math.floor((100 * unpacked) / size),
    isComplete: downloadComplete && validationComplete && unpackComplete,
    display: totalProgress > 98 ? 'Finalizing' : `${totalProgress}%`,
  }
}

export interface ProgressData {
  totalProgress: number
  downloadProgress: number
  validateProgress: number
  unpackProgress: number
  isComplete: boolean
  display: string
}