param(
    [Parameter(Mandatory=$true)][string]$Name,
    [Parameter(Mandatory=$true)][string]$ManifestPath,
    [switch]$Remove
)
$ErrorActionPreference = 'Stop'
if ($Name -notmatch '^com\.youtubedl\.test_[a-f0-9]{16}$') { throw 'Only isolated test hosts are allowed.' }
$taskManifest = [IO.Path]::GetFullPath($ManifestPath)
$taskKey = "Registry::HKEY_CURRENT_USER\Software\Microsoft\Edge\NativeMessagingHosts\$Name"
if (Test-Path -LiteralPath $taskKey) {
    $taskRegistered = (Get-Item -LiteralPath $taskKey).GetValue('')
    if ($taskRegistered -and $taskRegistered -ne $taskManifest) { throw 'Test registration belongs to another path.' }
}
if ($Remove) {
    if (Test-Path -LiteralPath $taskKey) { Remove-Item -LiteralPath $taskKey }
} else {
    $taskData = Get-Content -LiteralPath $taskManifest -Raw | ConvertFrom-Json
    if ($taskData.name -ne $Name) { throw 'Wrong test host manifest.' }
    New-Item -Path $taskKey -Force | Out-Null
    Set-Item -LiteralPath $taskKey -Value $taskManifest
    if ((Get-Item -LiteralPath $taskKey).GetValue('') -ne $taskManifest) { throw 'Test registration was not written.' }
}