[CmdletBinding()]
param(
    [string]$ProjectRoot
)

if (-not $ProjectRoot) {
    $ProjectRoot = Split-Path -Parent $PSScriptRoot
}

# NOTE (see docs/DECISIONS.md): on this host, `regsvr32 /s /u component.wsc` reports
# exit code 0 but leaves the ProgID/CLSID registry entries in place - verified experimentally,
# not a theoretical concern. regsvr32 /u is still attempted first (best effort, harmless if it
# no-ops), then registry state is checked and, if the entries survived, they are removed
# explicitly - scoped to exactly this project's ProgID/CLSID pairs so an unrelated component
# can never be touched even if it happened to reuse a ProgID string.

$components = @(
    @{ Path = (Join-Path $ProjectRoot 'test-app\Controllers\SelfTestController.wsc'); ProgId = 'WscMvc.SelfTestController'; ClassId = '{D2634944-4646-4C55-956E-4C05E7E10904}' },
    @{ Path = (Join-Path $ProjectRoot 'Controllers\HomeController.wsc'); ProgId = 'WscMvc.HomeController'; ClassId = '{87488446-60BE-4068-8368-0B709BB68F3F}' },
    @{ Path = (Join-Path $ProjectRoot 'Framework\Application.wsc'); ProgId = 'WscMvc.Application'; ClassId = '{851C7763-1638-42FE-A166-BF3DD3A96A88}' },
    @{ Path = (Join-Path $ProjectRoot 'Framework\RequestContext.wsc'); ProgId = 'WscMvc.RequestContext'; ClassId = '{1C36FA55-34DF-4974-94B9-D657389362B2}' }
)

function Remove-ProjectComponent {
    param([string]$ProgId, [string]$ClassId)

    $progIdKey = "HKLM:\SOFTWARE\Classes\$ProgId"
    $clsidKey = "HKLM:\SOFTWARE\Classes\CLSID\$ClassId"

    $registeredClassId = $null
    if (Test-Path "$progIdKey\CLSID") {
        $registeredClassId = (Get-ItemProperty "$progIdKey\CLSID" -ErrorAction SilentlyContinue).'(default)'
    }

    if (-not (Test-Path $progIdKey) -and -not (Test-Path $clsidKey)) {
        Write-Output "  Already absent: $ProgId / $ClassId"
        return
    }

    if ($registeredClassId -and $registeredClassId -ne $ClassId) {
        throw "Refusing to remove '$ProgId': registered CLSID ($registeredClassId) does not match this project's expected CLSID ($ClassId). This ProgID may belong to a different component."
    }

    if (Test-Path $progIdKey) {
        Remove-Item -Path $progIdKey -Recurse -Force
        Write-Output "  Removed $progIdKey"
    }
    if (Test-Path $clsidKey) {
        Remove-Item -Path $clsidKey -Recurse -Force
        Write-Output "  Removed $clsidKey"
    }
}

foreach ($component in $components) {
    $path = $component.Path
    if (-not (Test-Path $path)) {
        Write-Warning "Component not found, skipping: $path"
        continue
    }

    Write-Output "Unregistering $path"
    $proc = Start-Process -FilePath 'regsvr32.exe' -ArgumentList "/s /u `"$path`"" -PassThru -Wait -WindowStyle Hidden
    if ($proc.ExitCode -ne 0) {
        Write-Warning "regsvr32 /u reported exit $($proc.ExitCode) for $path; verifying registry state directly"
    }

    Remove-ProjectComponent -ProgId $component.ProgId -ClassId $component.ClassId
}

Write-Output "All WSC-MVC components unregistered."