param(
    [string]$ScriptPath = "scripts/open-offline-real-frmP2PChat.ps1"
)

$ErrorActionPreference = "Stop"
$repo = Resolve-Path -LiteralPath (Join-Path $PSScriptRoot "..")
$target = if ([System.IO.Path]::IsPathRooted($ScriptPath)) {
    $ScriptPath
}
else {
    Join-Path $repo $ScriptPath
}

if (-not (Test-Path -LiteralPath $target)) {
    throw "script not found: $target"
}

$text = Get-Content -LiteralPath $target -Raw
$requiredPatterns = @(
    @{ Name = "x86 PowerShell guard"; Pattern = "Environment]::Is64BitProcess" },
    @{ Name = "AssemblyResolve dependency loader"; Pattern = "AssemblyResolve" },
    @{ Name = "fake runtime mode parameter"; Pattern = "RuntimeMode" },
    @{ Name = "self chat variant"; Pattern = "SelfChat" },
    @{ Name = "skip roster variant"; Pattern = "SkipRosterManager" },
    @{ Name = "CLR IL offset extraction"; Pattern = "GetILOffset" },
    @{ Name = "IL offset JSON field"; Pattern = "il_offset_hex" },
    @{ Name = "Config.BaseConfig fake runtime"; Pattern = "<BaseConfig>k__BackingField" },
    @{ Name = "remote control config key"; Pattern = "Remote_Control_Visible" },
    @{ Name = "fake frmMain activation target"; Pattern = "<frmMain>k__BackingField" },
    @{ Name = "UserInfo cache warmup"; Pattern = "UserInfoCache" },
    @{ Name = "result artifact output"; Pattern = "real-frmP2PChat-result" }
)

$missing = @()
foreach ($item in $requiredPatterns) {
    if ($text -notmatch $item.Pattern) {
        $missing += $item.Name
    }
}

if ($missing.Count -gt 0) {
    throw "contract missing: $($missing -join ', ')"
}

[pscustomobject]@{
    ok = $true
    script = $target
    checked = $requiredPatterns.Count
} | ConvertTo-Json -Compress