# Prefer a Gitea-hosted node:20-alpine so docker build does not HEAD registry-1.docker.io.
# Order: Gitea -> optional NODE_IMAGE_SOURCE -> regional/official mirrors -> Docker Hub last.
# ASCII only: Windows PowerShell 5.1 + act_runner mis-parses backtick escapes in this file.
param(
  [Parameter(Mandatory = $true)][string]$RegistryPrefix,
  [string]$OutFile = '.ci-node-image',
  [string]$HubImage = 'node:20-alpine',
  [AllowEmptyString()]
  [string]$ExtraSources = ''
)

$ErrorActionPreference = 'Continue'
$mirror = "$RegistryPrefix/node:20-alpine"
$nl = [char]10

function Test-Image([string]$Name) {
  docker image inspect $Name 2>&1 | Out-Null
  return ($LASTEXITCODE -eq 0)
}

function Invoke-Pull([string]$Name, [int]$Attempts) {
  for ($i = 1; $i -le $Attempts; $i++) {
    Write-Host "docker pull $Name (attempt $i/$Attempts)"
    docker pull $Name
    if ($LASTEXITCODE -eq 0) { return $true }
    if ($i -lt $Attempts) { Start-Sleep -Seconds 5 }
  }
  return $false
}

function Save-Choice([string]$Name) {
  $utf8 = New-Object System.Text.UTF8Encoding $false
  $path = Join-Path (Get-Location) $OutFile
  [System.IO.File]::WriteAllText($path, ($Name + $nl), $utf8)
  Write-Host "NODE_IMAGE=$Name"
}

function Publish-Mirror([string]$Src) {
  Write-Host "Tagging $Src as $mirror"
  docker tag $Src $mirror
  if ($LASTEXITCODE -ne 0) { return $false }
  docker push $mirror
  if ($LASTEXITCODE -ne 0) {
    Write-Host "Could not push $mirror - docker build will use the local tag (legacy builder)."
    $flag = Join-Path (Get-Location) '.ci-use-legacy-builder'
    New-Item -ItemType File -Path $flag -Force | Out-Null
  }
  Save-Choice $mirror
  return $true
}

if (Test-Image $mirror) {
  Write-Host "Using local $mirror"
  Save-Choice $mirror
  exit 0
}

if (Invoke-Pull $mirror 1) {
  Save-Choice $mirror
  exit 0
}

$sources = New-Object System.Collections.ArrayList
if (-not [string]::IsNullOrWhiteSpace($ExtraSources)) {
  foreach ($part in ($ExtraSources -split ',')) {
    $src = $part.Trim()
    if ($src.Length -gt 0) { [void]$sources.Add($src) }
  }
}
# Iran-reachable proxy of Docker Hub official images, then public official mirrors, Hub last.
foreach ($src in @(
    'docker.arvancloud.ir/library/node:20-alpine',
    'public.ecr.aws/docker/library/node:20-alpine',
    'mirror.gcr.io/library/node:20-alpine',
    $HubImage
  )) {
  if (-not $sources.Contains($src)) { [void]$sources.Add($src) }
}

foreach ($src in $sources) {
  if (Test-Image $src) {
    Write-Host "Found local $src"
    if (Publish-Mirror $src) { exit 0 }
  }
}

foreach ($src in $sources) {
  if (Invoke-Pull $src 2) {
    if (Publish-Mirror $src) { exit 0 }
  }
}

Write-Host "Could not pull node:20-alpine from Gitea, mirrors, or Docker Hub."
Write-Host "Set repository variable NODE_IMAGE_SOURCE to a reachable image, for example:"
Write-Host "  docker.arvancloud.ir/library/node:20-alpine"
Write-Host "Or on the Windows runner:"
Write-Host "  docker pull docker.arvancloud.ir/library/node:20-alpine"
Write-Host "  docker tag docker.arvancloud.ir/library/node:20-alpine $mirror"
Write-Host "  docker push $mirror"
exit 1