[CmdletBinding()]
param([Parameter(Mandatory=$true)][string]$ArchivePath)
$ErrorActionPreference = 'Stop'
Add-Type -AssemblyName System.IO.Compression.FileSystem
$zip = [IO.Compression.ZipFile]::OpenRead((Resolve-Path -LiteralPath $ArchivePath).Path)
try {
    $plists = @($zip.Entries | Where-Object { $_.FullName -match '^[^/]+[.]app/Contents/Info[.]plist$' })
    if ($plists.Count -ne 1) { throw 'Expected exactly one macOS application bundle.' }
    $prefix = $plists[0].FullName -replace 'Info[.]plist$', ''
    $reader = [IO.StreamReader]::new($plists[0].Open())
    try { [xml]$plist = $reader.ReadToEnd() } finally { $reader.Dispose() }
    $executable = $plist.SelectSingleNode('//key[text()="CFBundleExecutable"]/following-sibling::string[1]').InnerText
    $identifier = $plist.SelectSingleNode('//key[text()="CFBundleIdentifier"]/following-sibling::string[1]').InnerText
    if ($identifier -ne 'com.blockline.relaydistrict' -or -not $executable -or $executable.Contains('/')) {
        throw 'Unexpected bundle identity or executable.'
    }
    $binary = $zip.GetEntry($prefix + 'MacOS/' + $executable)
    if (-not $binary -or $binary.Length -lt 1024) { throw 'Application executable missing.' }
    if (($binary.ExternalAttributes -band 0x00490000) -eq 0) { throw 'Unix executable permissions missing. Export directly to ZIP.' }
    $signature = $zip.GetEntry($prefix + '_CodeSignature/CodeResources')
    if (-not $signature -or $signature.Length -eq 0) { throw 'Code signature missing: enable built-in ad-hoc signing in the macOS preset.' }
    $packs = @($zip.Entries | Where-Object { $_.FullName.StartsWith($prefix + 'Resources/') -and $_.FullName.EndsWith('.pck') })
    if ($packs.Count -ne 1 -or $packs[0].Length -lt 1024) { throw 'Game data missing.' }
    Write-Host 'Mac archive structure OK: bundle, executable permissions, signature manifest, game data.'
} finally { $zip.Dispose() }