begin {
    function Uninstall-IPerf3 {
        [CmdletBinding()]
        param (
            [Parameter()]
            [String]
            $DestinationPath = 'C:\Program Files\iperf3'
        )

        begin {
            $Service = Get-Service -Name iperf3server -ErrorAction SilentlyContinue
        }

        process {
            if ($null -eq $Service) {
                Write-Host "Service is not installed"
            } else {
                try {
                    & "C:\Program Files\nssm\win64\nssm.exe" remove iperf3server confirm
                } catch {
                    Write-Error "Failed to uninstall service. $_"
                }
            }

            # Remove Program Files folder
            Remove-Item -Path $DestinationPath -Recurse -Force

            # Remove from PATH
            $RegexPath = $DestinationPath -replace '\\', '\\'
            [Environment]::SetEnvironmentVariable("Path", ($env:Path -replace ";$RegexPath\\",''), [System.EnvironmentVariableTarget]::Machine)
        }
    }
}

process {
    if (-not (Test-Path (Join-Path -Path $DestinationPath -ChildPath 'iperf3.exe'))) {
        Write-Host 'iPerf3 is not installed.'
    } else {
        Uninstall-IPerf3
    }
}