LogMsg "Cleanup-SystemTempFiles.ps1"

## Path to the system temp folder
$SysTemp = "${Env:SystemRoot}\TEMP"

## When deleting temp files en masse, only delete files/folders older than the number of days specified here
$OlderThan = 7
$TimeDelta = New-TimeSpan -Days $OlderThan

## Only run this section if we have administrative privileges
If ( IsAdmin )
{
    LogMsg "Running with administrative privileges"

    ## Remove all *.evtx files from $SysTemp
    $EventLogs = Get-ChildItem -Path "${SysTemp}\*" -File -Filter *.evtx
    If ( $EventLogs )
    {
        LogMsg "Deleting all event logs from ${SysTemp}"
        ForEach ( $EventLog in $EventLogs ) { Remove-Item $EventLog -Force -ErrorAction SilentlyContinue }
    }

    ## Remove misc logs and error reports
    $MiscLogs = Get-ChildItem -Path "${SysTemp}\*" -File -Include "${Env:COMPUTERNAME}-*.log", "AppxErrorReport_*.txt"
    If ( $MiscLogs )
    {
        LogMsg "Deleting misc logs from ${SysTemp}"
        ForEach ( $MiscLog in $MiscLogs ) { Remove-Item $MiscLog -Force -ErrorAction SilentlyContinue }
    }
    
    ## Remove archived CBS logs
    $CBSLogs = Get-ChildItem -Path "${Env:SystemRoot}\Logs\CBS\*" -File -Include "CbsPersist_*.log", "CbsPersist_*.cab"
    If ( $CBSLogs )
    {
        LogMsg "Deleting archived CBS logs from ${Env:SystemRoot}\Logs\CBS"
        ForEach ( $CBSLog in $CBSLogs ) { Remove-Item $CBSLog -Force -ErrorAction SilentlyContinue }
        
    }

    ## Remove all system temp files older than 7 days
    $OldTempFiles = Get-ChildItem -Path $SysTemp | Where { $_.LastWriteTime -lt ((Get-Date) - $TimeDelta) }
    If ( $OldTempFiles )
    {
        LogMsg "Deleting all temp files not modified in ${OlderThan} day(s) from ${SysTemp}"
        ForEach ( $OldTempFile in $OldTempFiles ) { Remove-Item $OldTempFile -Force -Recurse -ErrorAction SilentlyContinue }
    }

    ## Turn off system hibernation if it's in use
    If ( Test-Path "${Env:SystemDrive}\hiberfil.sys" )
    {
        LogMsg "Turning off system hibernation"
        Try { Start-Process "powercfg" -ArgumentList "-h off" -Wait }
        Catch { LogErr $_.Exception.Message }
    }
}

## Only run this section if we don't have administrative privileges
Else
{
    LogMsg "Running without administrative privileges"

    ## Remove all system temp files older than 7 days
    $OldTempFiles = Get-ChildItem -Path $Env:TEMP | Where { $_.LastWriteTime -lt ((Get-Date) - $TimeDelta) }
    If ( $OldTempFiles )
    {
        LogMsg "Deleting all temp files not modified in ${OlderThan} day(s) from ${Env:TEMP}"
        ForEach ( $OldTempFile in $OldTempFiles ) { Remove-Item $OldTempFile -Force -Recurse -ErrorAction SilentlyContinue }
    }
}