$ErrorActionPreference = 'Stop'

function Assert-Contains {
  param([string]$Content, [string]$Expected, [string]$Message)
  if ($Content -notmatch [regex]::Escape($Expected)) { throw $Message }
}

function Assert-NotContains {
  param([string]$Content, [string]$Unexpected, [string]$Message)
  if ($Content -match [regex]::Escape($Unexpected)) { throw $Message }
}

$root = Split-Path -Parent $PSScriptRoot
$shellPath = Join-Path $root 'components/AuthPageShell.vue'
if (-not (Test-Path -LiteralPath $shellPath)) { throw 'AuthPageShell is missing' }

$shell = Get-Content -LiteralPath $shellPath -Raw -Encoding utf8
foreach ($required in @(
  'class="auth-shell__header"',
  'class="auth-shell__header-image"',
  'a01-vnext-header-v1.png',
  'mode="widthFix"',
  'class="auth-shell__paper"',
  'a01-red-hall-ink-backdrop-v1.png',
  'auth-page-paper.jpg',
  'background-position: center calc(-48.18vw), center top;',
  'background-repeat: no-repeat, repeat-y;',
  '<slot />',
  '<slot name="overlay" />',
  'min-height: var(--app-viewport-height);'
)) {
  Assert-Contains -Content $shell -Expected $required -Message "AuthPageShell is missing: $required"
}

$page = Get-Content -LiteralPath (Join-Path $root 'pages/auth/a01-entry.vue') -Raw -Encoding utf8
Assert-Contains -Content $page -Expected '<AuthPageShell' -Message 'A01 must consume AuthPageShell'
foreach ($forbidden in @('class="page-canvas"', 'class="page-backdrop"', 'mode="scaleToFill"', '1665rpx')) {
  Assert-NotContains -Content $page -Unexpected $forbidden -Message "A01 retains rejected page coordinates: $forbidden"
}

Write-Output 'AUTH-PAGE-SHELL-CONTRACT PASS'