#Requires -RunAsAdministrator

$taskName  = 'Weekly Disk Cleanup'
$taskDescr = 'Runs cleanmgr.exe /sagerun:1 every Saturday at 20:00'

# Action
$action = New-ScheduledTaskAction `
    -Execute 'C:\Windows\System32\cleanmgr.exe' `
    -Argument '/sagerun:1'

# Trigger - ώρα ως [datetime] αντί για string
$trigger = New-ScheduledTaskTrigger `
    -Weekly `
    -DaysOfWeek Saturday `
    -At ([datetime]'20:00')

# Settings
$settings = New-ScheduledTaskSettingsSet `
    -StartWhenAvailable `
    -AllowStartIfOnBatteries `
    -DontStopIfGoingOnBatteries

# Principal - SYSTEM αντί για current user (αποφεύγει προβλήματα με username)
$principal = New-ScheduledTaskPrincipal `
    -UserId 'SYSTEM' `
    -LogonType ServiceAccount `
    -RunLevel Highest

# Αφαίρεσε αν υπάρχει ήδη
Unregister-ScheduledTask -TaskName $taskName -Confirm:$false -ErrorAction SilentlyContinue

# Δημιουργία task
Register-ScheduledTask `
    -TaskName $taskName `
    -Description $taskDescr `
    -Action $action `
    -Trigger $trigger `
    -Settings $settings `
    -Principal $principal