function Show-Header {
    Clear-Host
    Write-Host "============================================" -ForegroundColor Cyan
    Write-Host "   Network Adapter Configuration Tool" -ForegroundColor Cyan
    Write-Host "============================================" -ForegroundColor Cyan
    Write-Host ""
}

function Get-AdapterChoice {
    Show-Header
    Write-Host "Available Network Adapters:" -ForegroundColor Yellow
    Write-Host ""

    while ($true) {
        $adapters = Get-NetAdapter | Where-Object { $_.Status -ne 'Disabled' }

        if ($adapters.Count -eq 0) {
            Write-Host "No active network adapters found!" -ForegroundColor Red
            Read-Host "Press Enter to exit"
            exit
        }

        $index = 1
        foreach ($adapter in $adapters) {
            $status = if ($adapter.Status -eq 'Up') { 
                "[CONNECTED]" 
            } else { 
                "[" + $adapter.Status.ToUpper() + "]" 
            }

            # Get IP address
            $ipv4 = Get-NetIPAddress -InterfaceIndex $adapter.InterfaceIndex -AddressFamily IPv4 -ErrorAction SilentlyContinue
            $ipAddress = if ($ipv4) { $ipv4.IPAddress } else { "No IP" }

            # Get MAC address in both formats
            $macWindows = $adapter.MacAddress
            $macLinux = $macWindows -replace '-', ':'

            Write-Host "$index. $($adapter.Name)" -ForegroundColor White

            # Colored description + status
            $statusLabel = if ($adapter.Status -eq 'Up') { 'CONNECTED' } else { $adapter.Status.ToUpper() }
            if ($adapter.Status -eq 'Up') { $statusColor = 'Green' }
            elseif ($adapter.Status -in @('Down','NotPresent','Not Present')) { $statusColor = 'Red' }
            else { $statusColor = 'Yellow' }

            Write-Host "    $($adapter.InterfaceDescription) " -ForegroundColor Gray -NoNewline
            Write-Host "[$statusLabel]" -ForegroundColor $statusColor

            # Colored IP and MAC display
            if ($ipv4) {
                Write-Host "    IP: $ipAddress" -ForegroundColor Cyan -NoNewline
            } else {
                Write-Host "    IP: No IP" -ForegroundColor DarkYellow -NoNewline
            }
            Write-Host " | MAC: $macWindows ($macLinux)" -ForegroundColor DarkGray
            $index++
        }

        Write-Host ""
        Write-Host "R. Refresh list" -ForegroundColor White
        Write-Host "P. Add/Remove from System PATH" -ForegroundColor White
        Write-Host "0. Exit" -ForegroundColor Gray
        Write-Host ""

        do {
            $choice = Read-Host "Select adapter number"
            if ($choice -eq '0') {
                exit
            }
            if ($choice -in @('P','p')) {
                Add-ToSystemPath
                return $null
            }
            if ($choice -in @('R','r')) {
                break
            }

            if ($choice -match '^[0-9]+$') {
                $choiceNum = [int]$choice
            } else {
                $choiceNum = -1
            }
        } while ($choiceNum -lt 1 -or $choiceNum -gt $adapters.Count)

        if ($choice -in @('R','r')) {
            Clear-Host
            Show-Header
            continue
        }

        return $adapters[$choiceNum - 1]
    }
}

function Show-AdapterInfo {
    param (
        [Parameter(Mandatory=$true)]
        $Adapter
    )
    
    Show-Header
    Write-Host "Adapter: $($Adapter.Name)" -ForegroundColor Green
    Write-Host "Description: $($Adapter.InterfaceDescription)" -ForegroundColor White
    Write-Host "Status: $($Adapter.Status)" -ForegroundColor $(if ($Adapter.Status -eq 'Up') { 'Green' } else { 'Yellow' })
    Write-Host ""
    
    Write-Host "Hardware Information:" -ForegroundColor Yellow
    $macWindows = $Adapter.MacAddress
    $macLinux = $macWindows -replace '-', ':'
    Write-Host "  MAC Address: $macWindows (Windows)" -ForegroundColor White
    Write-Host "  MAC Address: $macLinux (Linux/Unix)" -ForegroundColor White
    Write-Host "  Link Speed: $($Adapter.LinkSpeed)" -ForegroundColor White
    Write-Host ""
    
    $ipConfig = Get-NetIPConfiguration -InterfaceIndex $Adapter.InterfaceIndex -ErrorAction SilentlyContinue
    $ipv4 = Get-NetIPAddress -InterfaceIndex $Adapter.InterfaceIndex -AddressFamily IPv4 -ErrorAction SilentlyContinue
    
    Write-Host "IPv4 Configuration:" -ForegroundColor Yellow
    
    if ($ipv4) {
        Write-Host "  IP Address: $($ipv4.IPAddress)" -ForegroundColor White
        Write-Host "  Subnet Prefix Length: $($ipv4.PrefixLength) ($(Convert-PrefixToSubnetMask $ipv4.PrefixLength))" -ForegroundColor White
        Write-Host "  DHCP Enabled: $($ipv4.PrefixOrigin -eq 'Dhcp')" -ForegroundColor White
    } else {
        Write-Host "  IP Address: Not configured" -ForegroundColor Gray
    }
    
    if ($ipConfig.IPv4DefaultGateway) {
        Write-Host "  Default Gateway: $($ipConfig.IPv4DefaultGateway.NextHop)" -ForegroundColor White
    } else {
        Write-Host "  Default Gateway: Not configured" -ForegroundColor Gray
    }
    
    $dnsServers = Get-DnsClientServerAddress -InterfaceIndex $Adapter.InterfaceIndex -AddressFamily IPv4 -ErrorAction SilentlyContinue
    if ($dnsServers -and $dnsServers.ServerAddresses) {
        Write-Host "  DNS Servers:" -ForegroundColor White
        foreach ($dns in $dnsServers.ServerAddresses) {
            Write-Host "    - $dns" -ForegroundColor White
        }
    } else {
        Write-Host "  DNS Servers: Not configured" -ForegroundColor Gray
    }
    
    Write-Host ""

    # Adapter details menu: include DHCP, manual IP, lease refresh, DNS flush and presets
    while ($true) {
        Write-Host "Options:" -ForegroundColor Yellow
        Write-Host "1. Set DHCP (enable DHCP on adapter)" -ForegroundColor White
        Write-Host "2. Set Manual IP" -ForegroundColor White
        Write-Host "3. Refresh DHCP lease (release/renew)" -ForegroundColor White
        Write-Host "4. Flush DNS cache" -ForegroundColor White
        Write-Host "5. Presets" -ForegroundColor White
        Write-Host "0. Back" -ForegroundColor Gray
        Write-Host ""

        $sel = Read-Host "Select option"
        switch ($sel) {
            '0' { break }
            '1' {
                Set-DHCPConfiguration -Adapter $Adapter
                # refresh adapter object
                $Adapter = Get-NetAdapter -InterfaceIndex $Adapter.InterfaceIndex -ErrorAction SilentlyContinue
                Clear-Host
                Show-Header
                Write-Host "Adapter: $($Adapter.Name)" -ForegroundColor Green
                continue
            }
            '2' {
                Set-ManualConfiguration -Adapter $Adapter
                $Adapter = Get-NetAdapter -InterfaceIndex $Adapter.InterfaceIndex -ErrorAction SilentlyContinue
                Clear-Host
                Show-Header
                Write-Host "Adapter: $($Adapter.Name)" -ForegroundColor Green
                continue
            }
            '3' {
                Refresh-DHCPLease -Adapter $Adapter
                $Adapter = Get-NetAdapter -InterfaceIndex $Adapter.InterfaceIndex -ErrorAction SilentlyContinue
                Clear-Host
                Show-Header
                Write-Host "Adapter: $($Adapter.Name)" -ForegroundColor Green
                continue
            }
            '4' {
                Flush-DNS
                Clear-Host
                Show-Header
                Write-Host "Adapter: $($Adapter.Name)" -ForegroundColor Green
                continue
            }
            '5' {
                Show-PresetsMenu -Adapter $Adapter
                $Adapter = Get-NetAdapter -InterfaceIndex $Adapter.InterfaceIndex -ErrorAction SilentlyContinue
                Clear-Host
                Show-Header
                Write-Host "Adapter: $($Adapter.Name)" -ForegroundColor Green
                continue
            }
            default {
                Write-Host "Invalid selection" -ForegroundColor Red
                Start-Sleep -Seconds 1
                Clear-Host
                Show-Header
                Write-Host "Adapter: $($Adapter.Name)" -ForegroundColor Green
                continue
            }
        }
    }
}

function Convert-PrefixToSubnetMask {
    param([int]$PrefixLength)
    
    $mask = ([Math]::Pow(2, 32) - [Math]::Pow(2, (32 - $PrefixLength)))
    $bytes = [BitConverter]::GetBytes([UInt32]$mask)
    [Array]::Reverse($bytes)
    return ($bytes -join '.')
}

function Convert-SubnetMaskToPrefix {
    param([string]$SubnetMask)
    
    $octets = $SubnetMask -split '\.'
    $binaryString = ''
    foreach ($octet in $octets) {
        $binaryString += [Convert]::ToString([int]$octet, 2).PadLeft(8, '0')
    }
    return ($binaryString.ToCharArray() | Where-Object { $_ -eq '1' }).Count
}

function Add-ToSystemPath {
    Write-Host ""
    Write-Host "Add NetworkConfig to System PATH" -ForegroundColor Yellow
    Write-Host "="*50 -ForegroundColor Yellow
    Write-Host ""
    
    $scriptPath = Split-Path -Parent $MyInvocation.MyCommand.Path
    
    # Check current PATH
    $userPath = [Environment]::GetEnvironmentVariable('Path', 'User')
    $machinePath = [Environment]::GetEnvironmentVariable('Path', 'Machine')
    
    $isInUserPath = $userPath -split ';' | Where-Object { $_ -eq $scriptPath }
    $isInMachinePath = $machinePath -split ';' | Where-Object { $_ -eq $scriptPath }
    
    Write-Host "Script Location: $scriptPath" -ForegroundColor Cyan
    Write-Host ""
    
    if ($isInUserPath) {
        Write-Host "✓ Already in User PATH" -ForegroundColor Green
    }
    if ($isInMachinePath) {
        Write-Host "✓ Already in System PATH" -ForegroundColor Green
    }
    
    if ($isInUserPath -or $isInMachinePath) {
        Write-Host ""
        Write-Host "Options:" -ForegroundColor Yellow
        Write-Host "1. Remove from User PATH" -ForegroundColor White
        Write-Host "2. Remove from System PATH" -ForegroundColor White
        Write-Host "0. Cancel" -ForegroundColor Gray
        Write-Host ""
        
        $choice = Read-Host "Select option"
        
        switch ($choice) {
            '1' {
                if ($isInUserPath) {
                    try {
                        $newPath = ($userPath -split ';' | Where-Object { $_ -ne $scriptPath }) -join ';'
                        [Environment]::SetEnvironmentVariable('Path', $newPath, 'User')
                        Write-Host "Successfully removed from User PATH!" -ForegroundColor Green
                        Write-Host "You may need to restart your terminals for changes to take effect." -ForegroundColor Yellow
                    }
                    catch {
                        Write-Host "Error removing from User PATH: $($_.Exception.Message)" -ForegroundColor Red
                    }
                } else {
                    Write-Host "Not found in User PATH." -ForegroundColor Yellow
                }
            }
            '2' {
                if ($isInMachinePath) {
                    try {
                        $newPath = ($machinePath -split ';' | Where-Object { $_ -ne $scriptPath }) -join ';'
                        [Environment]::SetEnvironmentVariable('Path', $newPath, 'Machine')
                        Write-Host "Successfully removed from System PATH!" -ForegroundColor Green
                        Write-Host "You may need to restart your terminals for changes to take effect." -ForegroundColor Yellow
                    }
                    catch {
                        Write-Host "Error removing from System PATH: $($_.Exception.Message)" -ForegroundColor Red
                    }
                } else {
                    Write-Host "Not found in System PATH." -ForegroundColor Yellow
                }
            }
        }
    } else {
        Write-Host "Not currently in PATH." -ForegroundColor Gray
        Write-Host ""
        Write-Host "Where would you like to add it?" -ForegroundColor Yellow
        Write-Host "1. User PATH (current user only)" -ForegroundColor White
        Write-Host "2. System PATH (all users - requires admin)" -ForegroundColor White
        Write-Host "0. Cancel" -ForegroundColor Gray
        Write-Host ""
        
        $choice = Read-Host "Select option"
        
        switch ($choice) {
            '1' {
                try {
                    $newPath = $userPath.TrimEnd(';') + ';' + $scriptPath
                    [Environment]::SetEnvironmentVariable('Path', $newPath, 'User')
                    Write-Host "Successfully added to User PATH!" -ForegroundColor Green
                    Write-Host "You can now run 'NetworkConfig' from any terminal." -ForegroundColor Green
                    Write-Host "You may need to restart your terminals for changes to take effect." -ForegroundColor Yellow
                }
                catch {
                    Write-Host "Error adding to User PATH: $($_.Exception.Message)" -ForegroundColor Red
                }
            }
            '2' {
                try {
                    $newPath = $machinePath.TrimEnd(';') + ';' + $scriptPath
                    [Environment]::SetEnvironmentVariable('Path', $newPath, 'Machine')
                    Write-Host "Successfully added to System PATH!" -ForegroundColor Green
                    Write-Host "You can now run 'NetworkConfig' from any terminal." -ForegroundColor Green
                    Write-Host "You may need to restart your terminals for changes to take effect." -ForegroundColor Yellow
                }
                catch {
                    Write-Host "Error adding to System PATH: $($_.Exception.Message)" -ForegroundColor Red
                    Write-Host "Make sure you're running as administrator." -ForegroundColor Yellow
                }
            }
        }
    }
    
    Write-Host ""
    Read-Host "Press Enter to continue"
}

function Refresh-DHCPLease {
    param (
        [Parameter(Mandatory=$false)]
        $Adapter
    )

    Write-Host ""
    Write-Host "Refreshing DHCP lease..." -ForegroundColor Yellow
    try {
        # Attempt a client-side release/renew. This may act on all adapters on some systems.
        Start-Process -FilePath ipconfig -ArgumentList '/release' -NoNewWindow -Wait
        Start-Process -FilePath ipconfig -ArgumentList '/renew' -NoNewWindow -Wait
        Write-Host "DHCP lease refreshed (client-side)." -ForegroundColor Green
    }
    catch {
        Write-Host "Error refreshing DHCP lease: $($_.Exception.Message)" -ForegroundColor Red
    }

    Write-Host ""
    Read-Host "Press Enter to continue"
}

function Flush-DNS {
    param ()

    Write-Host ""
    Write-Host "Flushing DNS cache..." -ForegroundColor Yellow
    try {
        # Use native cmdlet when available
        if (Get-Command -Name Clear-DnsClientCache -ErrorAction SilentlyContinue) {
            Clear-DnsClientCache -ErrorAction Stop
        }

        # Also run ipconfig flushdns for broad compatibility
        Start-Process -FilePath ipconfig -ArgumentList '/flushdns' -NoNewWindow -Wait

        Write-Host "DNS cache flushed." -ForegroundColor Green
    }
    catch {
        Write-Host "Error flushing DNS cache: $($_.Exception.Message)" -ForegroundColor Red
    }

    Write-Host ""
    Read-Host "Press Enter to continue"
}

function Set-DHCPConfiguration {
    param (
        [Parameter(Mandatory=$true)]
        $Adapter
    )
    
    Write-Host ""
    Write-Host "Setting adapter to DHCP..." -ForegroundColor Yellow
    
    try {
        # Remove existing IP configuration
        Remove-NetIPAddress -InterfaceIndex $Adapter.InterfaceIndex -Confirm:$false -ErrorAction SilentlyContinue
        Remove-NetRoute -InterfaceIndex $Adapter.InterfaceIndex -Confirm:$false -ErrorAction SilentlyContinue
        
        # Set to DHCP
        Set-NetIPInterface -InterfaceIndex $Adapter.InterfaceIndex -Dhcp Enabled -ErrorAction Stop
        Set-DnsClientServerAddress -InterfaceIndex $Adapter.InterfaceIndex -ResetServerAddresses -ErrorAction Stop
        
        Write-Host "Successfully configured adapter for DHCP!" -ForegroundColor Green
        Write-Host "The adapter will now obtain IP settings automatically." -ForegroundColor Green
    }
    catch {
        Write-Host "Error configuring DHCP: $($_.Exception.Message)" -ForegroundColor Red
    }
    
    Write-Host ""
    Read-Host "Press Enter to continue"
}

function Set-ManualConfiguration {
    param (
        [Parameter(Mandatory=$true)]
        $Adapter
    )
    
    Write-Host ""
    Write-Host "Manual IP Configuration" -ForegroundColor Yellow
    Write-Host "Leave fields blank to skip configuration for that setting" -ForegroundColor Gray
    Write-Host ""
    
    # Get IP Address
    do {
        $ipAddress = Read-Host "Enter IP Address (e.g., 192.168.1.100)"
        if ([string]::IsNullOrWhiteSpace($ipAddress)) {
            Write-Host "IP Address is required for manual configuration!" -ForegroundColor Red
        }
    } while ([string]::IsNullOrWhiteSpace($ipAddress))
    
    # Validate IP Address
    try {
        [System.Net.IPAddress]::Parse($ipAddress) | Out-Null
    }
    catch {
        Write-Host "Invalid IP Address format!" -ForegroundColor Red
        Read-Host "Press Enter to return to menu"
        return
    }
    
    # Get Subnet Mask
    do {
        $subnetMask = Read-Host "Enter Subnet Mask (e.g., 255.255.255.0) or prefix length (e.g., 24)"
        if ([string]::IsNullOrWhiteSpace($subnetMask)) {
            Write-Host "Subnet Mask is required for manual configuration!" -ForegroundColor Red
        }
    } while ([string]::IsNullOrWhiteSpace($subnetMask))
    
    # Convert subnet mask to prefix length
    if ($subnetMask -match '^\d{1,2}$') {
        $prefixLength = [int]$subnetMask
    } else {
        try {
            $prefixLength = Convert-SubnetMaskToPrefix $subnetMask
        }
        catch {
            Write-Host "Invalid Subnet Mask format!" -ForegroundColor Red
            Read-Host "Press Enter to return to menu"
            return
        }
    }
    
    # Get Default Gateway (optional)
    $gateway = Read-Host "Enter Default Gateway (press Enter to skip)"
    if (![string]::IsNullOrWhiteSpace($gateway)) {
        try {
            [System.Net.IPAddress]::Parse($gateway) | Out-Null
        }
        catch {
            Write-Host "Invalid Gateway format!" -ForegroundColor Red
            Read-Host "Press Enter to return to menu"
            return
        }
    }
    
    # Get DNS Servers (optional)
    $dnsServers = @()
    $dns1 = Read-Host "Enter Primary DNS Server (press Enter to skip)"
    if (![string]::IsNullOrWhiteSpace($dns1)) {
        try {
            [System.Net.IPAddress]::Parse($dns1) | Out-Null
            $dnsServers += $dns1
        }
        catch {
            Write-Host "Invalid DNS Server format!" -ForegroundColor Red
            Read-Host "Press Enter to return to menu"
            return
        }
    }
    
    $dns2 = Read-Host "Enter Secondary DNS Server (press Enter to skip)"
    if (![string]::IsNullOrWhiteSpace($dns2)) {
        try {
            [System.Net.IPAddress]::Parse($dns2) | Out-Null
            $dnsServers += $dns2
        }
        catch {
            Write-Host "Invalid DNS Server format!" -ForegroundColor Red
            Read-Host "Press Enter to return to menu"
            return
        }
    }
    
    # Confirm configuration
    Write-Host ""
    Write-Host "Configuration Summary:" -ForegroundColor Cyan
    Write-Host "  IP Address: $ipAddress/$prefixLength" -ForegroundColor White
    if (![string]::IsNullOrWhiteSpace($gateway)) {
        Write-Host "  Gateway: $gateway" -ForegroundColor White
    }
    if ($dnsServers.Count -gt 0) {
        Write-Host "  DNS Servers: $($dnsServers -join ', ')" -ForegroundColor White
    }
    Write-Host ""
    
    $confirm = Read-Host "Apply this configuration? (Y/N)"
    if ($confirm -ne 'Y' -and $confirm -ne 'y') {
        Write-Host "Configuration cancelled." -ForegroundColor Yellow
        Read-Host "Press Enter to continue"
        return
    }
    
    # Apply configuration
    Write-Host ""
    Write-Host "Applying configuration..." -ForegroundColor Yellow
    
    try {
        # Remove existing IP configuration
        Remove-NetIPAddress -InterfaceIndex $Adapter.InterfaceIndex -Confirm:$false -ErrorAction SilentlyContinue
        Remove-NetRoute -InterfaceIndex $Adapter.InterfaceIndex -Confirm:$false -ErrorAction SilentlyContinue
        
        # Disable DHCP
        Set-NetIPInterface -InterfaceIndex $Adapter.InterfaceIndex -Dhcp Disabled -ErrorAction Stop
        
        # Set IP Address
        New-NetIPAddress -InterfaceIndex $Adapter.InterfaceIndex `
                        -IPAddress $ipAddress `
                        -PrefixLength $prefixLength `
                        -DefaultGateway $(if (![string]::IsNullOrWhiteSpace($gateway)) { $gateway } else { $null }) `
                        -ErrorAction Stop | Out-Null
        
        # Set DNS Servers
        if ($dnsServers.Count -gt 0) {
            Set-DnsClientServerAddress -InterfaceIndex $Adapter.InterfaceIndex `
                                      -ServerAddresses $dnsServers `
                                      -ErrorAction Stop
        }
        
        Write-Host "Configuration applied successfully!" -ForegroundColor Green
    }
    catch {
        Write-Host "Error applying configuration: $($_.Exception.Message)" -ForegroundColor Red
    }
    
    Write-Host ""
    Read-Host "Press Enter to continue"
}

# Presets helpers
function Get-PresetsFilePath {
    return Join-Path $PSScriptRoot 'network-presets.json'
}

function Load-Presets {
    $file = Get-PresetsFilePath
    if (-not (Test-Path $file)) {
        return @()
    }

    try {
        $raw = Get-Content -Path $file -Raw -ErrorAction Stop
        if ([string]::IsNullOrWhiteSpace($raw)) { return @() }
        return $raw | ConvertFrom-Json -ErrorAction Stop
    }
    catch {
        Write-Host "Error loading presets file: $($_.Exception.Message)" -ForegroundColor Red
        return @()
    }
}

function Save-Presets($data) {
    $file = Get-PresetsFilePath
    try {
        $json = $data | ConvertTo-Json -Depth 10
        $json | Set-Content -Path $file -Encoding UTF8 -Force
        return $true
    }
    catch {
        Write-Host "Error saving presets file: $($_.Exception.Message)" -ForegroundColor Red
        return $false
    }
}

function Get-PresetsForAdapter($adapterGuid) {
    $all = Load-Presets
    if ($null -eq $all) { return @() }
    $entry = $all | Where-Object { $_.adapterGuid -eq $adapterGuid }
    if ($entry) { return $entry.presets }
    return @()
}

function Add-OrUpdate-Preset($adapter, $preset) {
    $all = Load-Presets
    if (-not $all) { $all = @() }

    $entry = $all | Where-Object { $_.adapterGuid -eq $adapter.InterfaceGuid }
    if (-not $entry) {
        $entry = [PSCustomObject]@{
            adapterGuid = $adapter.InterfaceGuid
            adapterName = $adapter.Name
            adapterDescription = $adapter.InterfaceDescription
            presets = @()
        }
        $all += $entry
    }

    # Replace existing preset with same name
    $existing = $entry.presets | Where-Object { $_.name -eq $preset.name }
    if ($existing) {
        $entry.presets = ($entry.presets | Where-Object { $_.name -ne $preset.name }) + $preset
    }
    else {
        $entry.presets += $preset
    }

    Save-Presets $all | Out-Null
}

function Remove-Preset($adapterGuid, $presetName) {
    $all = Load-Presets
    if (-not $all) { return $false }
    $entry = $all | Where-Object { $_.adapterGuid -eq $adapterGuid }
    if (-not $entry) { return $false }
    $entry.presets = $entry.presets | Where-Object { $_.name -ne $presetName }
    Save-Presets $all | Out-Null
    return $true
}

function Apply-Preset($adapter, $preset) {
    if ($preset.type -eq 'DHCP') {
        Set-DHCPConfiguration -Adapter $adapter
        return
    }

    try {
        Remove-NetIPAddress -InterfaceIndex $adapter.InterfaceIndex -Confirm:$false -ErrorAction SilentlyContinue
        Remove-NetRoute -InterfaceIndex $adapter.InterfaceIndex -Confirm:$false -ErrorAction SilentlyContinue

        Set-NetIPInterface -InterfaceIndex $adapter.InterfaceIndex -Dhcp Disabled -ErrorAction Stop

        New-NetIPAddress -InterfaceIndex $adapter.InterfaceIndex -IPAddress $preset.ipAddress -PrefixLength $preset.prefixLength -DefaultGateway $(if ($preset.gateway) { $preset.gateway } else { $null }) -ErrorAction Stop | Out-Null

        if ($preset.dns -and $preset.dns.Count -gt 0) {
            Set-DnsClientServerAddress -InterfaceIndex $adapter.InterfaceIndex -ServerAddresses $preset.dns -ErrorAction Stop
        }

        Write-Host "Preset '$($preset.name)' applied successfully." -ForegroundColor Green
    }
    catch {
        Write-Host "Error applying preset: $($_.Exception.Message)" -ForegroundColor Red
    }
    Read-Host "Press Enter to continue"
}

function Show-PresetsMenu {
    param([Parameter(Mandatory=$true)] $Adapter)

    while ($true) {
        Clear-Host
        Show-Header
        Write-Host "Presets for adapter: $($Adapter.Name)" -ForegroundColor Yellow
        $presets = Get-PresetsForAdapter $Adapter.InterfaceGuid
        if ($presets.Count -eq 0) {
            Write-Host "  (No presets saved)" -ForegroundColor Gray
        }
        else {
            $i = 1
            foreach ($p in $presets) {
                Write-Host "  $i. $($p.name) - $($p.type)" -ForegroundColor White
                $i++
            }
        }

        Write-Host "";
        Write-Host "A. Add current config as preset" -ForegroundColor White
        Write-Host "L. Load/apply a preset" -ForegroundColor White
        Write-Host "D. Delete a preset" -ForegroundColor White
        Write-Host "E. Export presets file location" -ForegroundColor White
        Write-Host "0. Back" -ForegroundColor Gray
        Write-Host ""

        $sel = Read-Host "Select option"
        switch ($sel) {
            '0' { break }
            'A' { 'A' } 'a' { 'A' } default { }
        }

        if ($sel -in @('A','a')) {
            # Capture current IPv4 config
            $ipConfig = Get-NetIPConfiguration -InterfaceIndex $Adapter.InterfaceIndex -ErrorAction SilentlyContinue
            $ipv4 = Get-NetIPAddress -InterfaceIndex $Adapter.InterfaceIndex -AddressFamily IPv4 -ErrorAction SilentlyContinue

            $presetName = Read-Host "Preset name"
            if ([string]::IsNullOrWhiteSpace($presetName)) { Write-Host "Name required" -ForegroundColor Red; Start-Sleep -Seconds 1; continue }

            if ($ipv4) {
                $presetObj = [PSCustomObject]@{
                    name = $presetName
                    type = 'Manual'
                    ipAddress = $ipv4.IPAddress
                    prefixLength = $ipv4.PrefixLength
                    gateway = (if ($ipConfig.IPv4DefaultGateway) { $ipConfig.IPv4DefaultGateway.NextHop } else { $null })
                    dns = (Get-DnsClientServerAddress -InterfaceIndex $Adapter.InterfaceIndex -AddressFamily IPv4 -ErrorAction SilentlyContinue).ServerAddresses
                }
            }
            else {
                $presetObj = [PSCustomObject]@{
                    name = $presetName
                    type = 'DHCP'
                }
            }

            Add-OrUpdate-Preset -adapter $Adapter -preset $presetObj
            Write-Host "Preset saved." -ForegroundColor Green
            Start-Sleep -Seconds 1
            continue

        }

        if ($sel -in @('L','l')) {
            if ($presets.Count -eq 0) { Write-Host "No presets." -ForegroundColor Yellow; Start-Sleep -Seconds 1; continue }
            $idx = Read-Host "Enter preset number to apply"
            if ($idx -match '^[0-9]+$') {
                $num = [int]$idx
                if ($num -ge 1 -and $num -le $presets.Count) {
                    $preset = $presets[$num - 1]
                    Apply-Preset -Adapter $Adapter -preset $preset
                }
                else { Write-Host "Invalid selection" -ForegroundColor Red; Start-Sleep -Seconds 1 }
            }
            else { Write-Host "Invalid input" -ForegroundColor Red; Start-Sleep -Seconds 1 }
            continue
        }

        if ($sel -in @('D','d')) {
            if ($presets.Count -eq 0) { Write-Host "No presets." -ForegroundColor Yellow; Start-Sleep -Seconds 1; continue }
            $idx = Read-Host "Enter preset number to delete"
            if ($idx -match '^[0-9]+$') {
                $num = [int]$idx
                if ($num -ge 1 -and $num -le $presets.Count) {
                    $name = $presets[$num - 1].name
                    Remove-Preset -adapterGuid $Adapter.InterfaceGuid -presetName $name | Out-Null
                    Write-Host "Deleted preset '$name'" -ForegroundColor Green
                }
                else { Write-Host "Invalid selection" -ForegroundColor Red }
            }
            else { Write-Host "Invalid input" -ForegroundColor Red }
            Start-Sleep -Seconds 1
            continue
        }

        if ($sel -in @('E','e')) {
            $file = Get-PresetsFilePath
            Write-Host "Presets file: $file" -ForegroundColor Cyan
            Read-Host "Press Enter to continue"
            continue
        }
    }
}

Export-ModuleMember -Function Show-Header, Get-AdapterChoice, Show-AdapterInfo, Convert-PrefixToSubnetMask, Convert-SubnetMaskToPrefix, Add-ToSystemPath, Set-DHCPConfiguration, Set-ManualConfiguration, Get-PresetsFilePath, Load-Presets, Save-Presets, Get-PresetsForAdapter, Add-OrUpdate-Preset, Remove-Preset, Apply-Preset, Show-PresetsMenu, Refresh-DHCPLease, Flush-DNS