[CmdletBinding()]
param (
    [Parameter()]
    [switch]
    $ShowInfo
)

# Välj nätadapter
$NetAdapter = Get-NetAdapter | Out-Gridview -PassThru

# Importera inställningar från CSV (ur samma mapp som scriptet)
$ImportedScope = Import-Csv $PSScriptRoot\NetworkSelection.csv -Delimiter "," | Out-GridView -PassThru

# Om inget alternativ väljs - skippa
if (![string]::IsNullOrEmpty($ImportedScope.Network)) {

    if ($ImportedScope.Network -eq 'DHCP') {

        # Fortsätt om DHCP är inaktiverad
        If (!(Get-NetIPInterface -InterfaceIndex $NetAdapter.ifindex -AddressFamily IPv4).Dhcp -as [bool]) {

            # Ta bort gamla routes om det finns
            if ((Get-NetIPConfiguration -InterfaceIndex $NetAdapter.ifindex).Ipv4DefaultGateway -as [bool]) {
                Remove-NetRoute -InterfaceIndex $NetAdapter.ifindex -Confirm:$false | Out-Null
            }

            # Därefter aktivera DHCP & återställ DNS
            Set-NetIPInterface -InterfaceIndex $NetAdapter.ifindex -DHCP Enabled -AddressFamily IPV4
            Set-DnsClientServerAddress -InterfaceIndex $NetAdapter.ifindex -ResetServerAddresses
            }

            # Se om internet fungerar, om inte kör /renew
            Start-Sleep 4
            if(!(Test-NetConnection -DiagnoseRouting).RouteDiagnosticsSucceeded){
                Write-Host "Running ipconfig /renew $($NetAdapter.Name)" -Foregroundcolor DarkYellow
                Start-Process ipconfig -ArgumentList "/renew $($NetAdapter.Name)" -Wait
            }

    } else {
        # Rensa gamla inställningar
        $NetAdapter | Remove-NetIPAddress -Confirm:$false
        $NetAdapter | Remove-NetRoute -Confirm:$false

        # Sätt interface alternativ för valt "Network"
        Set-DnsClientServerAddress -InterfaceIndex $NetAdapter.ifindex -ServerAddresses ($ImportedScope.dns1,$ImportedScope.dns2)
        New-NetIPAddress -InterfaceIndex $NetAdapter.ifindex -IPAddress $ImportedScope.IPAddress -AddressFamily IPv4 -PrefixLength $ImportedScope.SubnetMask -DefaultGateway $ImportedScope.DefaultGateway | Out-Null
    }
}

if ($ShowInfo) {
    Write-Host "`n[INFO] $($ImportedScope.Network)"
    Write-Host "`n --NetIPInterface" -Foregroundcolor DarkGreen
    Get-NetIPInterface -InterfaceIndex $NetAdapter.ifindex -AddressFamily IPv4
    Write-Host "`n --NetIPConfiguration(DefaultGateway)" -Foregroundcolor DarkGreen
    Get-NetIPConfiguration -InterfaceIndex $NetAdapter.ifindex | Select-Object -ExpandProperty Ipv4DefaultGateway | Format-Table
}