# backup-freshness.ps1 — age (s) of newest matching file in a folder.

$Url     = "YOUR_URL/backup"
$Folder  = "C:\Backups"
$Pattern = "*.bak"

$Newest = Get-ChildItem -LiteralPath $Folder -Filter $Pattern -File -ErrorAction SilentlyContinue `
        | Sort-Object LastWriteTimeUtc -Descending | Select-Object -First 1

if ($Newest) {
  $Age  = [int]([DateTime]::UtcNow - $Newest.LastWriteTimeUtc).TotalSeconds
  $Body = (@{
    hostname           = $env:COMPUTERNAME
    folder             = $Folder
    pattern            = $Pattern
    newest_file        = $Newest.Name
    newest_size_mb     = [math]::Round($Newest.Length / 1MB, 1)
    newest_age_seconds = $Age
  }) | ConvertTo-Json -Compress
} else {
  $Body = (@{
    hostname = $env:COMPUTERNAME; folder = $Folder; pattern = $Pattern
    newest_file = $null; newest_age_seconds = -1
  }) | ConvertTo-Json -Compress
}

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