function UpsertEnvironmentVariable {
    param ([Parameter(Mandatory)][string]$varName)
    if (Test-Path -Path env:$varName) {
        $varValue = [Environment]::GetEnvironmentVariable("$varName", "Machine")
        if ((Read-Host "$varName = $varValue already exists! Do you want to change it [y/n]?") -ne "y") { return; }
    }
    $varValue = Read-Host "Enter value for $varName"
    [Environment]::SetEnvironmentVariable($varName, $varValue, "Machine")
    Write-Host "$varName set to $varValue"
}
 
UpsertEnvironmentVariable "ASPNETCORE_ENVIRONMENT"
UpsertEnvironmentVariable "CP3_SERVICE_URL"
UpsertEnvironmentVariable "DX_SERVICE_URL"
UpsertEnvironmentVariable "CP3_SERVICE_CERT_NAME"
UpsertEnvironmentVariable "DX_SERVICE_CERT_NAME"
UpsertEnvironmentVariable "CP3_SERIAL_NUMBER"
UpsertEnvironmentVariable "GD_SERVER_NAME"
UpsertEnvironmentVariable "SIP_SERVICE_CP3_API_KEY"
 
if ((Read-Host "Restart IIS and code-deploy agent so that they detect new env variables [y/n]?") -eq "y") {
    & iisreset /restart
    Restart-Service -Name codedeployagent
}