$ErrorActionPreference = 'Stop'

$root = Split-Path -Parent $PSScriptRoot
Add-Type -AssemblyName System.Drawing

$assets = @(
  'static/assets/icons/common/location-v1.png',
  'static/assets/icons/common/member-meta-v1.png',
  'static/assets/icons/common/admin-v1.png',
  'static/assets/icons/genealogy/seal-current-frame-v1.png',
  'static/assets/icons/genealogy/seal-row-frame-v1.png',
  'static/assets/icons/action/create-cloud-v2.png'
)

foreach ($asset in $assets) {
  $bitmap = [System.Drawing.Bitmap]::FromFile((Join-Path $root $asset))
  $width = [int]$bitmap.Width
  $height = [int]$bitmap.Height
  $corners = @(
    $bitmap.GetPixel(0, 0).A,
    $bitmap.GetPixel(($width - 1), 0).A,
    $bitmap.GetPixel(0, ($height - 1)).A,
    $bitmap.GetPixel(($width - 1), ($height - 1)).A
  )
  $visiblePixels = 0
  for ($y = 0; $y -lt $height; $y++) {
    for ($x = 0; $x -lt $width; $x++) {
      if ($bitmap.GetPixel($x, $y).A -gt 24) { $visiblePixels++ }
    }
  }
  $bitmap.Dispose()
  if (($corners | Where-Object { $_ -ne 0 }).Count -ne 0) { throw "$asset has opaque outer corners." }
  if ($visiblePixels -lt 80) { throw "$asset has no usable visible artwork." }
  Write-Output "PASS $asset transparent corners and visible artwork"
}