param(
  [string]$SourceRoot = "\\192.168.178.58\backups",
  [string]$DestinationRoot = "H:\kallilab-nearline-backups",
  [switch]$WhatIf
)

$ErrorActionPreference = "Stop"

$Jobs = @(
  @{
    Name = "borg-dumps-latest"
    Source = Join-Path $SourceRoot "borg\dumps\latest"
    Destination = Join-Path $DestinationRoot "borg-dumps\latest"
    Purpose = "Latest database/application dumps (Unraid-Flash-Artefakte bewusst ausgeschlossen, weil 0600 root:root - dafuer bleibt die Hetzner-Borg-Kette die Restore-Quelle)"
    # /XF schliesst bewusst die unraid-flash-config-Artefakte aus,
    # weil sie hostseitig 0600 root:root sind und der SMB-Share das
    # nicht ueberbruecken kann. Restore-Quelle dafuer bleibt das
    # Hetzner-Borg-Repo (siehe docs/RESTORE_MATRIX.md Tier 1 Unraid OS Flash).
    ExcludeFiles = @("unraid-flash-config.tar.gz", "unraid-flash-config.tar.gz.sha256", "unraid-flash-config.manifest.txt")
  },
  @{
    Name = "gitea-bundles"
    Source = Join-Path $SourceRoot "git-bundles\gitea"
    Destination = Join-Path $DestinationRoot "git-bundles\gitea"
    Purpose = "Verified bare-repository bundles for Gitea bootstrap"
    ExcludeFiles = @()
  }
)

function Assert-PathExists {
  param(
    [string]$Path,
    [string]$Label
  )

  if (-not (Test-Path -LiteralPath $Path)) {
    throw "$Label not found: $Path"
  }
}

function Invoke-RobocopyJob {
  param(
    [hashtable]$Job,
    [string]$LogRoot
  )

  $logPath = Join-Path $LogRoot ("{0}-{1}.log" -f (Get-Date -Format "yyyyMMdd-HHmmss"), $Job.Name)
  New-Item -ItemType Directory -Force -Path $Job.Destination | Out-Null

  $args = @(
    $Job.Source,
    $Job.Destination,
    "/E",
    "/COPY:DAT",
    "/DCOPY:DAT",
    "/R:2",
    "/W:5",
    "/FFT",
    "/XJ",
    "/XD",
    ".tmp",
    "/NP",
    "/TEE",
    "/LOG:$logPath"
  )

  if ($Job.ContainsKey("ExcludeFiles") -and $Job.ExcludeFiles.Count -gt 0) {
    $args += "/XF"
    $args += $Job.ExcludeFiles
  }

  Write-Host "Running robocopy job: $($Job.Name)"
  Write-Host "  Source:      $($Job.Source)"
  Write-Host "  Destination: $($Job.Destination)"

  & robocopy @args
  $code = $LASTEXITCODE

  if ($code -gt 7) {
    throw "Robocopy job '$($Job.Name)' failed with exit code $code. See log: $logPath"
  }

  [pscustomobject]@{
    Name = $Job.Name
    Source = $Job.Source
    Destination = $Job.Destination
    ExitCode = $code
    Log = $logPath
  }
}

Assert-PathExists -Path $SourceRoot -Label "Source root"

foreach ($job in $Jobs) {
  Assert-PathExists -Path $job.Source -Label "Source for job '$($job.Name)'"
}

if ($WhatIf) {
  Write-Host "H:/ nearline pull plan only. No files will be copied."
  Write-Host "SourceRoot: $SourceRoot"
  Write-Host "DestinationRoot: $DestinationRoot"
  Write-Host ""
  foreach ($job in $Jobs) {
    Write-Host "- $($job.Name)"
    Write-Host "  Purpose:     $($job.Purpose)"
    Write-Host "  Source:      $($job.Source)"
    Write-Host "  Destination: $($job.Destination)"
  }
  exit 0
}

$destinationDrive = Split-Path -Qualifier $DestinationRoot
Assert-PathExists -Path $destinationDrive -Label "Destination drive"

$logRoot = Join-Path $DestinationRoot "_logs"
$reportRoot = Join-Path $DestinationRoot "_reports"
New-Item -ItemType Directory -Force -Path $DestinationRoot, $logRoot, $reportRoot | Out-Null

$results = foreach ($job in $Jobs) {
  Invoke-RobocopyJob -Job $job -LogRoot $logRoot
}

$reportPath = Join-Path $reportRoot ("nearline-pull-{0}.md" -f (Get-Date -Format "yyyy-MM-dd-HHmmss"))

$lines = @()
$lines += "# H:/ Nearline Pull Report - $(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')"
$lines += ""
$lines += "- Source root: ``$SourceRoot``"
$lines += "- Destination root: ``$DestinationRoot``"
$lines += "- Mode: non-destructive copy, no ``/MIR``, no purge"
$lines += ""
$lines += "| Job | Exit code | Source | Destination | Log |"
$lines += "|---|---:|---|---|---|"
foreach ($result in $results) {
  $lines += "| $($result.Name) | $($result.ExitCode) | ``$($result.Source)`` | ``$($result.Destination)`` | ``$($result.Log)`` |"
}
$lines += ""
$lines += "Expected critical artifacts after run:"
$lines += ""
$lines += "- ``borg-dumps/latest/immich.dump``"
$lines += "- ``borg-dumps/latest/komodo-mongo.archive.gz``"
$lines += "- ``git-bundles/gitea/latest-report.md``"
$lines += "- ``git-bundles/gitea/micha/*.bundle``"
$lines += ""
$lines += "Bewusst NICHT in Nearline-Scope:"
$lines += ""
$lines += "- ``unraid-flash-config.tar.gz`` (hostseitig 0600 root:root; Restore aus Hetzner-Borg)"

$lines | Set-Content -LiteralPath $reportPath -Encoding UTF8

Write-Host "H:/ nearline pull completed."
Write-Host "Report: $reportPath"