# ad-replication.ps1 — domain controller replication summary via repadmin.
# Run on a DC (or any host with RSAT-AD installed).

$Url      = "YOUR_URL/ad-repl"
$Output   = & repadmin /replsummary 2>&1
$ExitCode = $LASTEXITCODE

if ($ExitCode -ne 0) {
  $Body = (@{
    hostname   = $env:COMPUTERNAME
    error      = "repadmin exit $ExitCode"
    output_excerpt = ($Output | Select-Object -First 20) -join "`n"
  }) | ConvertTo-Json -Compress
  Invoke-RestMethod -Uri $Url -Method Post -Body $Body -ContentType "application/json" -TimeoutSec 15 | Out-Null
  exit 1
}

$Failures = 0
$FailingLines = @()
# repadmin /replsummary rows look like:
#   Source DSA       largest delta    fails/total %%   error
#   DC01                   00m:01s     0/  6  0
foreach ($line in $Output) {
  if ($line -match '^\s*\S+\s+\S+\s+(\d+)\s*/\s*\d+\s+\S+') {
    $fails = [int]$matches[1]
    if ($fails -gt 0) {
      $Failures += $fails
      $FailingLines += $line.Trim()
    }
  }
}

$Body = (@{
  hostname        = $env:COMPUTERNAME
  total_failures  = $Failures
  failing_summary = $FailingLines
}) | ConvertTo-Json -Compress -Depth 4

Invoke-RestMethod -Uri $Url -Method Post -Body $Body `
  -ContentType "application/json" -TimeoutSec 15 | Out-Null