# Removes the Homelab Manager agent from this Windows machine: deletes its scheduled task, the installed
# script, and its credentials file.
#
# Run in an ELEVATED Windows PowerShell (Run as administrator):
#
#   [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
#   iex ((New-Object Net.WebClient).DownloadString('https://homelab.example.lan/agent/windows/uninstall.ps1'))
#
# (With a self-signed certificate, also run
#   [Net.ServicePointManager]::ServerCertificateValidationCallback = { $true }
# first.)
#
# NOTE: keep this file plain ASCII (it is downloaded as text).

$ErrorActionPreference = 'Stop'

$script:TaskName = 'Homelab Manager Agent'
$script:InstallDir = Join-Path $env:ProgramData 'HomelabManager'

function Uninstall-Agent {
  $identity = [Security.Principal.WindowsIdentity]::GetCurrent()
  if (-not ([Security.Principal.WindowsPrincipal]$identity).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
    throw 'This uninstaller must be run as Administrator. Open PowerShell with "Run as administrator" and try again.'
  }

  Write-Output 'Removing Homelab Manager agent...'

  if (Get-ScheduledTask -TaskName $script:TaskName -ErrorAction SilentlyContinue) {
    Stop-ScheduledTask -TaskName $script:TaskName -ErrorAction SilentlyContinue
    Unregister-ScheduledTask -TaskName $script:TaskName -Confirm:$false
  }

  # Only the files this agent installed - never the folder wholesale, in case something else was put beside them.
  foreach ($name in 'homelab-manager-agent.ps1', 'agent.json') {
    $path = Join-Path $script:InstallDir $name
    if (Test-Path -LiteralPath $path) { [System.IO.File]::Delete($path) }
  }
  if ((Test-Path -LiteralPath $script:InstallDir) -and -not (Get-ChildItem -LiteralPath $script:InstallDir -Force)) {
    [System.IO.Directory]::Delete($script:InstallDir)
  }

  Write-Output 'Done. The agent no longer runs or reports from this machine.'
  Write-Output 'Its entry (and task history) in Homelab Manager is untouched - delete it from the Servers page if you no longer want it tracked.'
}

Uninstall-Agent