$ErrorActionPreference = 'Stop'

$root = Split-Path -Parent $PSScriptRoot

function Remove-JavaScriptComments([string]$Content) {
  # 注释不能伪造迁移计数；字符串必须保留，才能继续捕获方括号与 Reflect 取值。
  $builder = [System.Text.StringBuilder]::new($Content.Length)
  $state = 'code'
  $quote = [char]0
  $stringReturnState = 'code'
  $commentReturnState = 'code'
  $templateReturnStates = [System.Collections.Generic.Stack[string]]::new()
  $templateExpressionDepths = [System.Collections.Generic.Stack[int]]::new()
  for ($index = 0; $index -lt $Content.Length; $index += 1) {
    $character = $Content[$index]
    $next = if ($index + 1 -lt $Content.Length) { $Content[$index + 1] } else { [char]0 }

    if ($state -eq 'template-string') {
      [void]$builder.Append($character)
      if ($character -eq [char]92 -and $index + 1 -lt $Content.Length) {
        $index += 1
        [void]$builder.Append($Content[$index])
      } elseif ($character -eq [char]96) {
        $state = $templateReturnStates.Pop()
      } elseif ($character -eq [char]36 -and $next -eq [char]123) {
        [void]$builder.Append($next)
        $index += 1
        $templateExpressionDepths.Push(1)
        $state = 'template-code'
      }
      continue
    }

    if ($state -in @('code', 'template-code')) {
      if ($state -eq 'template-code' -and $character -eq [char]123) {
        $depth = $templateExpressionDepths.Pop() + 1
        $templateExpressionDepths.Push($depth)
        [void]$builder.Append($character)
      } elseif ($state -eq 'template-code' -and $character -eq [char]125) {
        $depth = $templateExpressionDepths.Pop() - 1
        [void]$builder.Append($character)
        if ($depth -eq 0) {
          $state = 'template-string'
        } else {
          $templateExpressionDepths.Push($depth)
        }
      } elseif ($state -eq 'code' -and $character -eq [char]60 -and $index + 3 -lt $Content.Length -and $Content.Substring($index, 4) -eq '<!--') {
        $state = 'html-comment'
        [void]$builder.Append('    ')
        $index += 3
      } elseif ($character -eq [char]96) {
        $templateReturnStates.Push($state)
        $state = 'template-string'
        [void]$builder.Append($character)
      } elseif ($character -in @([char]39, [char]34)) {
        $stringReturnState = $state
        $state = 'string'
        $quote = $character
        [void]$builder.Append($character)
      } elseif ($character -eq [char]47 -and $next -eq [char]47) {
        $state = 'line-comment'
        $commentReturnState = if ($templateExpressionDepths.Count -gt 0) { 'template-code' } else { 'code' }
        [void]$builder.Append('  ')
        $index += 1
      } elseif ($character -eq [char]47 -and $next -eq [char]42) {
        $state = 'block-comment'
        $commentReturnState = if ($templateExpressionDepths.Count -gt 0) { 'template-code' } else { 'code' }
        [void]$builder.Append('  ')
        $index += 1
      } else {
        [void]$builder.Append($character)
      }
      continue
    }

    if ($state -eq 'string') {
      [void]$builder.Append($character)
      if ($character -eq [char]92 -and $index + 1 -lt $Content.Length) {
        $index += 1
        [void]$builder.Append($Content[$index])
      } elseif ($character -eq $quote) {
        $state = $stringReturnState
      }
      continue
    }

    if ($state -eq 'line-comment') {
      if ($character -in @([char]10, [char]13)) {
        $state = $commentReturnState
        [void]$builder.Append($character)
      } else {
        [void]$builder.Append(' ')
      }
      continue
    }

    if ($state -eq 'html-comment') {
      if ($character -eq [char]45 -and $index + 2 -lt $Content.Length -and $Content.Substring($index, 3) -eq '-->') {
        $state = 'code'
        [void]$builder.Append('   ')
        $index += 2
      } elseif ($character -in @([char]10, [char]13)) {
        [void]$builder.Append($character)
      } else {
        [void]$builder.Append(' ')
      }
      continue
    }

    if ($character -eq [char]42 -and $next -eq [char]47) {
      $state = $commentReturnState
      [void]$builder.Append('  ')
      $index += 1
    } elseif ($character -in @([char]10, [char]13)) {
      [void]$builder.Append($character)
    } else {
      [void]$builder.Append(' ')
    }
  }
  return $builder.ToString()
}

function Remove-HtmlComments([string]$Content) {
  return [regex]::Replace(
    $Content,
    '(?s)<!--.*?-->',
    { param($match) $match.Value -replace '[^\r\n]', ' ' }
  )
}

function Get-ScannableSource([string]$Content, [string]$Extension) {
  if ($Extension -ne '.vue') { return Remove-JavaScriptComments $Content }

  # SFC 必须分段处理：先遮蔽顶层 script/style，再把完整 markup（含嵌套 template）
  # 按 HTML 处理；template 中的 https:// 绝不是 JS 注释。
  $builder = [System.Text.StringBuilder]::new()
  $codeBlockPattern = '(?is)<(?<Tag>script|style)\b[^>]*>(?<Body>.*?)</\k<Tag>>'
  $blocks = [regex]::Matches(
    $Content,
    $codeBlockPattern
  )
  $markup = [regex]::Replace(
    $Content,
    $codeBlockPattern,
    { param($match) $match.Value -replace '[^\r\n]', ' ' }
  )
  [void]$builder.AppendLine((Remove-HtmlComments $markup))
  foreach ($block in $blocks) {
    [void]$builder.AppendLine((Remove-JavaScriptComments $block.Groups['Body'].Value))
  }
  return $builder.ToString()
}

$navigationMethodPattern = 'navigateTo|navigateBack|redirectTo|reLaunch|switchTab'
$navigationReferencePattern = '\b(?:' + $navigationMethodPattern + ')\b'
$switchTabReferencePattern = '\bswitchTab\b'
$stackReferencePattern = '\bgetCurrentPages\b'
$declarativeNavigationPattern = '<\s*navigator\b'
$dynamicUniAccessPattern = '(?:\buni\b|\(\s*uni\s*\))\s*(?:\?\.)?\s*\[|\bReflect\.(?:get|apply)\s*\(\s*uni\b'
$escapedUniValuePattern = '\buni\b(?!\s*(?:\?\.|\.|\[|-))'

foreach ($sample in @(
  'uni.navigateTo',
  '(uni).navigateBack',
  'uni?.["redirectTo"]',
  "const {`n  reLaunch: replace`n} = uni",
  'const u = uni; u.switchTab',
  'Reflect.get(uni, "navigateTo")'
)) {
  if ((Remove-JavaScriptComments $sample) -notmatch $navigationReferencePattern) {
    throw "导航源扫描正则漏检受保护语法：$sample"
  }
}
foreach ($sample in @(
  '// uni.navigateTo()',
  '/* Reflect.get(uni, "navigateBack") */',
  '<!-- uni.redirectTo({}) -->',
  'const label = `${ /* uni.reLaunch() */ safe }`'
)) {
  if ((Remove-JavaScriptComments $sample) -match $navigationReferencePattern) {
    throw "导航源扫描不得让注释伪造迁移计数：$sample"
  }
}
foreach ($sample in @('<navigator url="/pages/demo">', 'uni?.[method]', '(uni)[method]', 'Reflect.get(uni, method)')) {
  $sanitized = Remove-JavaScriptComments $sample
  if ($sanitized -notmatch $declarativeNavigationPattern -and $sanitized -notmatch $dynamicUniAccessPattern) {
    throw "导航源扫描漏检声明式或动态 Uni 导航入口：$sample"
  }
}
foreach ($sample in @('const u = uni', 'consume(uni)', 'const u = globalThis.uni')) {
  if ((Remove-JavaScriptComments $sample) -notmatch $escapedUniValuePattern) {
    throw "导航源扫描漏检 Uni 对象逃逸：$sample"
  }
}
$sfcUrlSample = '<template><text>https://example.test/a</text><button @click="uni.navigateTo({ url: target })"></button></template>'
if ((Get-ScannableSource $sfcUrlSample '.vue') -notmatch '\bnavigateTo\b') {
  throw '导航源扫描把 template 的 https:// 误判为注释并漏掉后续真实调用'
}
$nestedTemplateSample = '<template><template v-if="ready"><text>安全内容</text></template><button @click="uni.redirectTo({ url: target })"></button></template>'
if ((Get-ScannableSource $nestedTemplateSample '.vue') -notmatch '\bredirectTo\b') {
  throw '导航源扫描在嵌套 template 结束标签处提前停止'
}
$templateLiteralUrlSample = 'const url = `https://example.test/a`; uni.reLaunch({ url })'
if ((Remove-JavaScriptComments $templateLiteralUrlSample) -notmatch '\breLaunch\b') {
  throw '导航源扫描把模板字符串中的 https:// 误判为行注释'
}
# 这是任务 3—9 的临时、精确迁移债务账本：每迁移一个文件就必须同轮删除
# 对应行并收紧计数；任务 10 必须把该列表清空，而不是保留长期白名单。
$expectedMigrationDebt = @()

$excludedDirectories = @('.agents', '.git', '.hbuilderx', 'design-pipeline', 'docs', 'node_modules', 'static', 'tests', 'unpackage')
$productionFiles = @(
  Get-ChildItem -LiteralPath $root -File |
    Where-Object { $_.Extension -in @('.vue', '.js') }
  foreach ($directory in Get-ChildItem -LiteralPath $root -Directory | Where-Object { $_.Name -notin $excludedDirectories }) {
    Get-ChildItem -LiteralPath $directory.FullName -Recurse -File |
      Where-Object { $_.Extension -in @('.vue', '.js') }
  }
)
$sourceFiles = @($productionFiles | Where-Object {
  $relativePath = $_.FullName.Substring($root.Length + 1).Replace('\', '/')
  $relativePath -match '^(components|pages)/'
})

foreach ($file in $productionFiles) {
  $content = Get-ScannableSource ([System.IO.File]::ReadAllText($file.FullName, [System.Text.Encoding]::UTF8)) $file.Extension
  $relativePath = $file.FullName.Substring($root.Length + 1).Replace('\', '/')
  if ($content -match $declarativeNavigationPattern) {
    throw "声明式 navigator 绕过了唯一导航网关：$relativePath"
  }
  if ($content -match $dynamicUniAccessPattern) {
    throw "动态 Uni 属性或反射调用绕过了可审计导航合同：$relativePath"
  }
  if ($relativePath -ne 'utils/navigation.js' -and $content -match $escapedUniValuePattern) {
    throw "Uni 对象被作为值传递或保存，无法静态审计导航调用：$relativePath"
  }
}
$actualMigrationDebt = @()
$switchTabOwners = @()
foreach ($file in $sourceFiles) {
  $content = Get-ScannableSource ([System.IO.File]::ReadAllText($file.FullName, [System.Text.Encoding]::UTF8)) $file.Extension
  $relativePath = $file.FullName.Substring($root.Length + 1).Replace('\', '/')
  $navigateToCount = [regex]::Matches($content, '\bnavigateTo\b').Count
  $navigateBackCount = [regex]::Matches($content, '\bnavigateBack\b').Count
  $redirectToCount = [regex]::Matches($content, '\bredirectTo\b').Count
  $reLaunchCount = [regex]::Matches($content, '\breLaunch\b').Count
  $navigationCount = $navigateToCount + $navigateBackCount + $redirectToCount + $reLaunchCount
  $stackCount = [regex]::Matches($content, $stackReferencePattern).Count
  $routeLiteralCount = [regex]::Matches($content, '/pages/').Count
  if ($content -match $switchTabReferencePattern) { $switchTabOwners += $relativePath }
  if (($navigationCount + $stackCount + $routeLiteralCount) -gt 0) {
    $actualMigrationDebt += "$relativePath|$navigateToCount|$navigateBackCount|$redirectToCount|$reLaunchCount|$stackCount|$routeLiteralCount"
  }
}
$actualMigrationDebt = @($actualMigrationDebt | Sort-Object)

if ($switchTabOwners.Count -gt 0) {
  throw "项目没有原生 tabBar，不得调用 uni.switchTab：$($switchTabOwners -join ', ')"
}
if (($actualMigrationDebt -join "`n") -ne ($expectedMigrationDebt -join "`n")) {
  $unexpected = @($actualMigrationDebt | Where-Object { $_ -notin $expectedMigrationDebt })
  $missing = @($expectedMigrationDebt | Where-Object { $_ -notin $actualMigrationDebt })
  throw "导航迁移债务漂移；新增/计数变化：$($unexpected -join ', ')；已消失但未收紧：$($missing -join ', ')"
}

foreach ($file in $productionFiles | Where-Object {
  $_.FullName.Substring($root.Length + 1).Replace('\', '/') -notmatch '^(components|pages)/'
}) {
  $content = Get-ScannableSource ([System.IO.File]::ReadAllText($file.FullName, [System.Text.Encoding]::UTF8)) $file.Extension
  $relativePath = $file.FullName.Substring($root.Length + 1).Replace('\', '/')
  $hasNavigationRuntime = $content -match "$navigationReferencePattern|$stackReferencePattern"
  $hasRouteLiteral = $content.Contains('/pages/')
  if ($content -match $switchTabReferencePattern) {
    throw "项目没有原生 tabBar，utils 也不得调用 uni.switchTab：$relativePath"
  }
  if ($hasNavigationRuntime -and $relativePath -ne 'utils/navigation.js') {
    throw "导航网关外的 utils 文件调用 Uni 导航或页面栈：$relativePath"
  }
  if ($hasRouteLiteral -and $relativePath -ne 'utils/navigation-routes.js') {
    throw "路由注册表外的 utils 文件保存业务页面路径：$relativePath"
  }
}

$fallbackOwners = @(
  $productionFiles | Where-Object {
    (Get-ScannableSource ([System.IO.File]::ReadAllText($_.FullName, [System.Text.Encoding]::UTF8)) $_.Extension) -match 'fallbackUrl|fallback-url'
  } | ForEach-Object { $_.FullName.Substring($root.Length + 1).Replace('\', '/') }
)
if ($fallbackOwners.Count -gt 0) {
  throw "旧 fallbackUrl 合同必须全局删除：$($fallbackOwners -join ', ')"
}

Write-Output "NAVIGATION-SOURCE-SCAN-CONTRACT PASS MIGRATION-DEBT=$($actualMigrationDebt.Count)"