param(
    [Parameter(Mandatory=$true)]
    [string]$TargetHost,
    [int]$ShutdownTimeoutSeconds = 10
)

# 1) Is target computer running?
if (-not (Test-Connection -ComputerName $TargetHost -Quiet -Count 1)) { 
    Write-Host "$TargetHost is not accessible; exiting" -ForegroundColor Red
    exit 1	
}

# 2) Initiate shutdown
Write-Host "Initiating $TargetHost remote shutdown" -ForegroundColor Cyan
# Force running apps to close, either /f or /t >0
shutdown /s /m \\$TargetHost /t $ShutdownTimeoutSeconds /f /c "Remote shutdown"

# 3) Wait until it stops responding to ping
do {
    Start-Sleep -Seconds 2
} while (Test-Connection -ComputerName $TargetHost -Quiet -Count 1)

# Optional extra safety delay
Start-Sleep -Seconds 10

# 4)
Write-Host "Remote shutdown confirmed; $TargetHost should be ready to cut power." -ForegroundColor Cyan

# 5) Now it’s safe to cut power at the PDU / relay
# (call your PDU API or GPIO control here)