$ErrorActionPreference = 'Stop'

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

function Assert-NoCssSurface {
  param([string]$Content, [string]$ClassName)
  foreach ($property in @('border', 'border-radius')) {
    $pattern = "(?s)\\.$ClassName\\s*\\{[^}]*\\b$property\\s*:"
    if ($Content -match $pattern) { throw "G03 must not construct .$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)
$g03 = Get-Content -LiteralPath (Join-Path $root 'pages/genealogy/g03-create-genealogy.vue') -Raw -Encoding utf8
$g04 = Join-Path $root 'pages/genealogy/g04-first-ancestor.vue'
$panelPath = Join-Path $root 'static/assets/modules/genealogy/transparent/g01-empty-panel-frame.png'

if (-not ($paths -contains 'pages/genealogy/g03-create-genealogy')) { throw 'G03 route missing' }
if ($paths -contains 'pages/genealogy/g04-first-ancestor') { throw 'G04 route must be removed; first-ancestor is a G03 state' }
if (Test-Path -LiteralPath $g04) { throw 'G04 page file must be deleted; first-ancestor is a G03 state' }

foreach ($required in @(
  'const currentStep = ref("create");',
  'query.get("step") === "ancestor"',
  'window.addEventListener("hashchange", syncFlowFromRoute)',
  'step=ancestor&genealogyId=',
  'const createState = ref("form");',
  'const ancestorState = ref("form");',
  'const fieldErrors = reactive({',
  'const duplicateReminderVisible = ref(false);',
  'class="duplicate-reminder-layer"',
  'if (isSubmitting.value) return;',
  '/pages/genealogy/g05-genealogy-overview?genealogyId=',
  'g01-empty-panel-frame.png',
  'a01-scroll-primary-v3.png',
  'create-flow-panel',
  'flow-primary-action',
  'import PageHeader from "@/components/PageHeader.vue";',
  '<PageHeader',
  'custom-back',
  '@back="goBack"'
)) {
  Assert-Contains -Content $g03 -Expected $required -Message "Missing G03 flow contract: $required"
}

foreach ($forbidden in @("from '@/utils/api.js'", 'appApi.', 'uni.showToast', 'uni.showModal', 'uni.showLoading', 'uni.showActionSheet', '/pages/tree/t01-tree-overview?genealogyId=', 'class="flow-header"', 'flow-header__back', 'root-header-cinnabar.jpg')) {
  if ($g03 -match [regex]::Escape($forbidden)) { throw "G03 retains forbidden implementation: $forbidden" }
}

foreach ($className in @('create-flow-panel', 'flow-primary-action')) {
  Assert-NoCssSurface -Content $g03 -ClassName $className
}

if (-not (Test-Path -LiteralPath $panelPath)) { throw 'G03 requires the accepted genealogy paper panel bitmap' }
Add-Type -AssemblyName System.Drawing
$panel = [System.Drawing.Bitmap]::FromFile($panelPath)
try {
  if ($panel.Width -ne 1122 -or $panel.Height -ne 1402) { throw 'G03 paper panel asset must be 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 0 }).Count -ne 0) { throw 'G03 paper panel outer corners must remain transparent' }
} finally {
  $panel.Dispose()
}

Write-Output 'G03-CREATE-FLOW-CONTRACT PASS'