$ErrorActionPreference = 'Stop'

function ConvertFrom-Utf8Base64 {
  param([string]$Value)
  return [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($Value))
}

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
$entryPath = Join-Path $root 'pages/auth/a01-entry.vue'
$legacyLoginPath = Join-Path $root 'pages/auth/a02-login.vue'
$pagesPath = Join-Path $root 'pages.json'

if (-not (Test-Path -LiteralPath $entryPath)) {
  throw 'Missing the single A01 login page.'
}
if (Test-Path -LiteralPath $legacyLoginPath) {
  throw 'A02 was merged into A01, so the legacy page file must be removed.'
}

$pages = Get-Content -LiteralPath $pagesPath -Raw -Encoding utf8 | ConvertFrom-Json
if ($pages.pages[0].path -ne 'pages/auth/a01-entry') {
  throw 'A01 must remain the first application route.'
}
if ($pages.pages.path -contains 'pages/auth/a02-login') {
  throw 'pages.json must not retain the legacy A02 route.'
}
if ($pages.pages.Count -ne 53) {
  throw "Expected 53 final routes after the A02 merge, found $($pages.pages.Count)."
}

$entry = Get-Content -LiteralPath $entryPath -Raw -Encoding utf8

# Final decorative surfaces must come from real bitmap assets.
foreach ($asset in @(
  'a01-login-header-v1.png',
  'a01-login-header-exact-v2.png',
  'auth-ink-scenery.png',
  'a01-login-scroll-frame-v1.png',
  'a01-title-divider-v2.png',
  'a01-primary-button.png',
  'a01-secondary-button.png',
  'auth-wechat.png',
  'a01-icon-phone-v1.png',
  'a01-icon-lock-v1.png',
  'a01-icon-eye-open-v1.png',
  'a01-icon-eye-closed-pupil-v2.png',
  'a01-icon-sms-code-v2.png',
  'a02-agreement-unchecked.png',
  'a02-agreement-checked.png'
)) {
  Assert-Contains -Content $entry -Expected $asset -Message "A01 is missing asset reference: $asset"
}
foreach ($obsoleteHeaderAsset in @('auth-header.png', 'brand-seal.png', 'a01-paper-transition-v1.png')) {
  Assert-NotContains -Content $entry -Unexpected $obsoleteHeaderAsset -Message "A01 must use the selected design's single exact header bitmap instead of composing $obsoleteHeaderAsset."
}

$requiredCopy = @(
  '55m75b2V5a626LCx',
  '5a+G56CB55m75b2V',
  '6aqM6K+B56CB55m75b2V',
  '5omL5py65Y+3',
  '5a+G56CB',
  '6aqM6K+B56CB',
  '5b+Y6K6w5a+G56CB',
  '6I635Y+W6aqM6K+B56CB',
  '5b6u5L+h55m75b2V',
  '6L+Y5rKh5pyJ6LSm5Y+377yf',
  '5rOo5YaM6LSm5Y+3',
  '44CK55So5oi35Y2P6K6u44CL',
  '44CK6ZqQ56eB5pS/562W44CL'
) | ForEach-Object { ConvertFrom-Utf8Base64 $_ }
foreach ($copy in $requiredCopy) {
  Assert-Contains -Content $entry -Expected $copy -Message "A01 is missing required visible copy: $copy"
}

foreach ($contract in @(
  "const activeLoginMethod = ref('password')",
  'const passwordVisible = ref(false)',
  "const LOGIN_METHOD_STORAGE_KEY = 'a01:last-login-method'",
  'uni.getStorageSync(LOGIN_METHOD_STORAGE_KEY)',
  'uni.setStorageSync(LOGIN_METHOD_STORAGE_KEY, method)',
  'const switchLoginMethod = (method) =>',
  'const togglePasswordVisibility = () =>',
  "url: '/pages/auth/a04-register'",
  "url: '/pages/auth/a05-reset-password'",
  'class="feedback-toast"',
  'class="verification-layer"',
  'class="login-submit"'
)) {
  Assert-Contains -Content $entry -Expected $contract -Message "A01 is missing state or interaction contract: $contract"
}

foreach ($nativeUi in @('uni.showToast', 'uni.showModal', 'uni.showLoading', 'uni.showActionSheet')) {
  Assert-NotContains -Content $entry -Unexpected $nativeUi -Message "A01 must not use native UniApp feedback: $nativeUi"
}
Assert-NotContains -Content $entry -Unexpected "url: '/pages/auth/a02-login" -Message 'A01 must not navigate to A02.'
Assert-NotContains -Content $entry -Unexpected 'brand-intro' -Message 'A01 must remove the legacy oversized brand introduction.'
Assert-NotContains -Content $entry -Unexpected 'min-height: 100vh' -Message 'A01 must not depend on 100vh for its page shell.'
Assert-NotContains -Content $entry -Unexpected 'exact-chrome-overlay' -Message 'A01 must not stack a second full-screen scroll perimeter over the complete scroll frame.'
Assert-NotContains -Content $entry -Unexpected 'auth-design-scenery-v1.png' -Message 'A01 must not use the scenery bitmap that contains stray scroll handles.'
Assert-NotContains -Content $entry -Unexpected 'a01-icon-eye-closed-v1.png' -Message 'A01 hidden-password icon must retain the center pupil instead of using the hollow crossed eye.'
Assert-NotContains -Content $entry -Unexpected 'a01-icon-verification-v1.png' -Message 'A01 SMS field must use a message-code icon instead of a success-state checkmark.'
Assert-NotContains -Content $entry -Unexpected 'a01-icon-sms-code-v1.svg' -Message 'A01 SMS field must use the custom generated icon instead of the temporary third-party SVG.'
Assert-NotContains -Content $entry -Unexpected '@media (max-height:' -Message 'A01 must preserve the design ratio on short screens and scroll instead of compressing with pixel breakpoints.'

Write-Output 'A01-LOGIN-MERGE-CONTRACT PASS'