$ErrorActionPreference = 'Stop'

$decode = {
  param([string]$value)
  [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($value))
}

$root = (Resolve-Path '.').Path
$requiredPaths = @(
  (& $decode 'ZG9jcy9kZXNpZ24='),
  (& $decode 'ZG9jcy9kZXNpZ24v6KeG6KeJ6K6+6K6h5Lqk5o6l5omL5YaMLm1k'),
  (& $decode 'ZG9jcy9kZXNpZ24v6KeG6KeJ6K+B5o2u57Si5byVLm1k'),
  (& $decode 'ZG9jcy9kZXNpZ24vRDFf5a6J5Y2T6KeG6KeJ6KeE6IyD5LiO6aG16Z2i5aOzLm1k'),
  (& $decode 'ZG9jcy9kZXNpZ24vUDAwX+mhtemdoue7k+aehOS4jui1hOS6p+a4heWNlS5tZA==')
)

foreach ($path in $requiredPaths) {
  if (-not (Test-Path $path)) { throw "required handoff path missing: $path" }
}

if (-not (Test-Path '.gitignore')) { throw '.gitignore is required' }
$ignore = Get-Content -Raw -Encoding UTF8 '.gitignore'
foreach ($pattern in @('/tmp/', '/unpackage/', '/docs/superpowers/specs/design/', '/tmp-g01-icon-audit.png')) {
  if (-not $ignore.Contains($pattern)) { throw "missing ignore pattern: $pattern" }
}

if (Test-Path 'docs/superpowers/specs/design') {
  throw 'misplaced design archive remains inside repository'
}

$screens = Get-ChildItem 'docs/design/screens' -File -Recurse
$screenBytes = ($screens | Measure-Object Length -Sum).Sum
if ($screens.Count -gt 35) { throw "too many handoff screenshots: $($screens.Count)" }
if ($screenBytes -gt 20MB) { throw "handoff screenshots exceed 20MB: $([math]::Round($screenBytes / 1MB, 2))MB" }

$indexPath = (& $decode 'ZG9jcy9kZXNpZ24v6KeG6KeJ6K+B5o2u57Si5byVLm1k')
$index = Get-Content -Raw -Encoding UTF8 $indexPath
$links = [regex]::Matches($index, '\[[^\]]+\]\(([^)]+)\)')
foreach ($link in $links) {
  $target = Join-Path (Split-Path $indexPath) $link.Groups[1].Value
  if (-not (Test-Path $target)) { throw "broken evidence link: $($link.Groups[1].Value)" }
}

Write-Output "REPOSITORY-HANDOFF-SIZE-CONTRACT PASS files=$($screens.Count) mb=$([math]::Round($screenBytes / 1MB, 2)) links=$($links.Count)"