# ================================
# Turn on Dark Mode for all users
# ================================
$subKeys = Get-ChildItem "Registry::HKEY_USERS" |
           Where-Object {
               $_.Name -notmatch "_Classes$" -and
               $_.PSChildName -notin @("S-1-5-18","S-1-5-19","S-1-5-20")
           }

foreach ($sid in $subKeys) {

    $regPath = "Registry::HKEY_USERS\$($sid.PSChildName)\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize"

    if (-not (Test-Path $regPath)) {
        New-Item -Path $regPath -Force | Out-Null
    }

    Set-ItemProperty -Path $regPath -Name AppsUseLightTheme -Type DWord -Value 0
    Set-ItemProperty -Path $regPath -Name SystemUsesLightTheme -Type DWord -Value 0

    Write-Host "Dark mode enabled for SID: $($sid.PSChildName)"
}

# ================================
# Set brightness best efficiency (40% default)
# ================================
$brightness = Get-WmiObject -Namespace root\wmi -Class WmiMonitorBrightnessMethods
$brightness.WmiSetBrightness(1, 40)

# ================================
# Screen Saver OFF for all users
# ================================
$users = Get-ChildItem "Registry::HKEY_USERS" |
         Where-Object {
             $_.Name -notmatch "_Classes$" -and
             $_.PSChildName -notin @("S-1-5-18","S-1-5-19","S-1-5-20")
         }

foreach ($user in $users) {

    $regPath = "Registry::HKEY_USERS\$($user.PSChildName)\Control Panel\Desktop"

    if (-not (Test-Path $regPath)) {
        New-Item -Path $regPath -Force | Out-Null
    }

    Set-ItemProperty -Path $regPath -Name "ScreenSaveActive"   -Value "0" -Force
    Set-ItemProperty -Path $regPath -Name "ScreenSaveTimeOut"  -Value "0" -Force
    Remove-ItemProperty -Path $regPath -Name "SCRNSAVE.EXE" -ErrorAction SilentlyContinue

    Write-Host "Screen saver disabled for SID: $($user.PSChildName)"
}


$scheme = "scheme_current"

# ================================
# Sleep after 3 minutes
# ================================
powercfg /setacvalueindex $scheme SUB_SLEEP STANDBYIDLE 180
powercfg /setdcvalueindex $scheme SUB_SLEEP STANDBYIDLE 180

# ================================
# Turn off screen after 3 minutes
# ================================
powercfg /setacvalueindex $scheme SUB_VIDEO VIDEOIDLE 180
powercfg /setdcvalueindex $scheme SUB_VIDEO VIDEOIDLE 180