#Powershell Magic Back once again with the Powershell 🥓 flavour

<#
.SYNOPSIS
    Retrieves a list of virtual machines from specified Nutanix servers and exports their details to a CSV file.

.DESCRIPTION
    This script connects to one or more Nutanix Prism Element clusters using provided credentials, retrieves information about virtual machines (VMs), and exports the VM names, IP addresses, and server names to a CSV file. It bypasses SSL certificate validation for API requests and supports multiple servers.

.PARAMETER Creds
    The PSCredential object containing the username and password for Nutanix API authentication. If not provided, prompts for credentials.

.PARAMETER Servers
    An array of Nutanix server hostnames or IP addresses to query. Defaults to a predefined list of five servers.

.NOTES
    - The script bypasses SSL certificate validation, which may pose a security risk in production environments.
    - Requires PowerShell and network connectivity to the Nutanix Prism Element clusters.

.EXAMPLE
    .\Get-NutanixMachines.ps1 -Creds (Get-Credential) -Servers @("nutanixserver1", "nutanixserver2") -FilePath C:\Temp\NutanixVMs.csv

    Prompts for credentials and retrieves VM information from the specified Nutanix servers.
#>
param(
    [Parameter(Mandatory = $true)]
    [PSCredential]$Creds = $(Get-Credential),
    [Parameter(Mandatory = $false)]
    [string[]]$Servers = @("nutanixserver1", "nutanixserver2", "nutanixserver3")
    [Parameter(Mandatory = $true)]
    [ValidateScript({ Test-Path (Split-Path $_ -Parent) })]
    [string]$FilePath
)
# Using credential information to use in script.
$accessKey = $Creds.UserName
$secretKey = $Creds.Password

# Convert the secure string password to plain text for API authentication
$BSTR = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($secretKey)
$ptp = [System.Runtime.InteropServices.Marshal]::PtrToStringAuto($BSTR)
$credPair = "$($accessKey):$($ptp)"

# Trust all SSL certificates
add-type @"
    using System.Net;
    using System.Security.Cryptography.X509Certificates;
    public class TrustAllCertsPolicy : ICertificatePolicy {
        public bool CheckValidationResult(
            ServicePoint srvPoint, X509Certificate certificate,
            WebRequest request, int certificateProblem) {
            return true;
        }
    }
"@

[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

# Prepare output array
$names = @()

# Loop through each cluster
foreach ($server in $Servers) {
    Write-Host "Processing server: $server..."
    try {
        $con = Test-Connection $server -Count 1 -ErrorAction Stop
        $server_ip = $con.IPV4Address.IPAddressToString
        $encoded = [System.Convert]::ToBase64String([System.Text.Encoding]::ASCII.GetBytes($credPair))
        $header = @{"Authorization" = "Basic $encoded"}
        $method = "post"
        $uri = "https://${server_ip}:9440/api/nutanix/v3/vms/list"
        $offset = 0
        $length = 100
        do {
            $Payload = @{
                kind   = "vm"
                length = $length
                offset = $offset
            }
            $JSON = $Payload | ConvertTo-Json -Depth 10
            $cluster_response = Invoke-RestMethod -Uri $uri -Method $method -Body $JSON -ContentType 'application/json' -Headers $header
            foreach ($item in $cluster_response.entities) {
                $vmName = $item.status.name
                if ($item.status.resources.power_state -eq "ON") {
                    $vmIPs = (($item.status.resources.nic_list.ip_endpoint_list.ip) -replace "{|}", "") -join "-"
                } else {
                    $vmIPs = "PoweredOff"
                }
                $names += [pscustomobject]@{
                    Name    = $vmName
                    IPs     = $vmIPs
                    Server  = $server
                    Cluster = $item.status.cluster_reference.name
                }
            }
            $offset += $length
        } while ($cluster_response.entities.Count -eq $length)
    } catch {
        Write-Warning "Failed to process $server : $_"
    }
}

# Export results to CSV
$names | Export-Csv $FilePath -NoTypeInformation -Force
Write-Host "Export complete: $FilePath"