$ErrorActionPreference = 'Stop'

function Assert-Match {
  param([string]$Content, [string]$Pattern, [string]$Message)
  if ($Content -notmatch $Pattern) { throw $Message }
}

function Assert-NoCssSurface {
  param([string]$Content, [string]$ClassName)
  foreach ($property in @('border', 'background', 'border-radius')) {
    $pattern = "(?s)\\.$ClassName\\s*\\{[^}]*\\b$property\\s*:"
    if ($Content -match $pattern) {
      throw "G01 empty state must not construct .$ClassName with CSS $property"
    }
  }
}

$root = Split-Path -Parent $PSScriptRoot
$pages = Get-Content -LiteralPath (Join-Path $root 'pages.json') -Raw -Encoding utf8 | ConvertFrom-Json
$paths = @($pages.pages.path)
$g01 = Get-Content -LiteralPath (Join-Path $root 'pages/genealogy/g01-my-genealogies.vue') -Raw -Encoding utf8
$panelPath = Join-Path $root 'static/assets/modules/genealogy/opaque/g01-empty-panel.png'

if (-not ($paths -contains 'pages/genealogy/g01-my-genealogies')) { throw 'G01 route missing' }
if ($paths -contains 'pages/genealogy/g02-empty-genealogies') { throw 'G02 route must be removed; empty state belongs to G01' }

foreach ($required in @(
  'forceEmptyState',
  'query.get("state") === "empty"',
  'g01-empty-panel.png',
  'empty-create-action',
  'empty-search-action',
  'const createGenealogy = () =>',
  '/pages/genealogy/g03-create-genealogy',
  '/pages/genealogy/g06-search-genealogies',
  'const hasGenealogies = computed(() => !forceEmptyState.value && list.value.length > 0);'
)) {
  if ($g01 -notmatch [regex]::Escape($required)) { throw "Missing G01 empty-state contract: $required" }
}

foreach ($className in @('empty-panel', 'empty-create-action', 'empty-search-action')) {
  Assert-NoCssSurface -Content $g01 -ClassName $className
}

if (-not (Test-Path -LiteralPath $panelPath)) { throw 'G01 requires its final raster empty-panel asset' }
Add-Type -AssemblyName System.Drawing
$panel = [System.Drawing.Bitmap]::FromFile($panelPath)
try {
  if ($panel.Width -ne 1122 -or $panel.Height -ne 1402) { throw 'G01 empty-panel asset must remain 1122 x 1402px' }
  $corners = @(
    $panel.GetPixel(0, 0).A,
    $panel.GetPixel(($panel.Width - 1), 0).A,
    $panel.GetPixel(0, ($panel.Height - 1)).A,
    $panel.GetPixel(($panel.Width - 1), ($panel.Height - 1)).A
  )
  if (($corners | Where-Object { $_ -ne 255 }).Count -ne 0) { throw 'G01 empty-panel asset must have opaque outer corners' }
} finally {
  $panel.Dispose()
}

Write-Output 'G01-EMPTY-STATE-CONTRACT PASS'