# Adds 1 background(s) from https://behindme.onneby.com to Microsoft Teams.
# Writes only to Teams' own custom-background folder for the current user.
$ErrorActionPreference = 'Stop'
$ProgressPreference = 'SilentlyContinue'

$backgrounds = @(
  @{ Guid = 'bf085683-a35f-42c2-a30b-1b474afe953f'; Ext = 'jpg'; Image = 'https://behindme.onneby.com/images/dm1fo17efd.jpg'; Thumb = 'https://behindme.onneby.com/images/dm1fo17efd_thumb.jpg' }
)

$targets = @(
  # New Teams (2023+)
  @{ App = (Join-Path $env:LOCALAPPDATA 'Packages\MSTeams_8wekyb3d8bbwe');
     Dir = (Join-Path $env:LOCALAPPDATA 'Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams\Backgrounds\Uploads') },
  # Classic Teams
  @{ App = (Join-Path $env:APPDATA 'Microsoft\Teams');
     Dir = (Join-Path $env:APPDATA 'Microsoft\Teams\Backgrounds\Uploads') }
)

$installed = 0
foreach ($target in $targets) {
  if (-not (Test-Path $target.App)) { continue }
  New-Item -ItemType Directory -Force -Path $target.Dir | Out-Null
  foreach ($bg in $backgrounds) {
    Invoke-WebRequest -UseBasicParsing -Uri $bg.Image -OutFile (Join-Path $target.Dir "$($bg.Guid).$($bg.Ext)")
    Invoke-WebRequest -UseBasicParsing -Uri $bg.Thumb -OutFile (Join-Path $target.Dir "$($bg.Guid)_thumb.$($bg.Ext)")
  }
  Write-Host "Added $($backgrounds.Count) background(s) to $($target.Dir)"
  $installed++
}

if ($installed -eq 0) {
  Write-Warning "Couldn't find Microsoft Teams for this user. Download the image instead and use 'Add new' under Backgrounds in a meeting."
} else {
  Write-Host "Done. In Teams, start or join a meeting (Calendar > Meet now works) and open the background effects next to the camera switch. Quit and reopen Teams if they don't show up yet."
}