#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.
    - The output CSV file is saved to C:\Temp\nutanix.csv by default.
    - Requires PowerShell and network connectivity to the Nutanix Prism Element clusters.

.EXAMPLE
    .\Get-NutanixMachines.ps1 -Creds (Get-Credential) -Servers @("nutanixserver1", "nutanixserver2")

    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")
)

# 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)"

# Adding the TrustAllCertsPolicy class to bypass SSL certificate validation
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;
        }
    }
"@

# Bypass SSL certificate validation
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12  

# Create empty array to store results to
$names = @()
$cluster = @()
foreach ($server in $servers)
{
    Write-Host "Please wait processing the server $server this will take a moment..."
    $con = Test-Connection $server -Count 1
    $server_ip = $($con.IPV4Address.IPAddressToString) # Use the IP according the API used. v2/v3/v4 works in PC. For PE, use v2/v3
    $encoded = [System.Convert]::ToBase64String([System.Text.Encoding]::ASCII.GetBytes($credPair))
    $header = @{"Authorization" = "Basic $encoded"}
    $Payload = @{
        kind   = "vm"
    } 
    $JSON = $Payload | convertto-json 
    $method = "post"
    $uri = "https://${server_ip}:9440/api/nutanix/v3/vms/list"
    $cluster_response = Invoke-RestMethod -Uri $uri -Method $method -Body $JSON -ContentType 'application/json' -Headers $header
    switch ([int]$cluster_response.metadata.total_matches)
    {
        {$_ -ge 1000}  {write-host -ForegroundColor red "There is over 1000 entries in $server $($_) vms exist";$Total = [math]::Round($_/400,0)}
        {$_ -le 999 -and $_ -gt 500} {write-host -ForegroundColor yellow "There is over 500 entries in $server $($_) vms exist";$Total = [math]::Round($_/500,0)}
        Default {write-host -ForegroundColor green "There less than 500 entries in $server $($_) vms exist";$Total = [math]::Round($_/500,0)}
    }
    switch ($Total)
    {
        {$_ -eq 0 -or $_ -eq 1} {
            $Payload = @{
                kind   = "vm"
                length = 500
                offset = 0
            } 
            $JSON1 = $Payload | convertto-json
            write-host "Running query 1"
            $cluster += Invoke-RestMethod -Uri $uri -Method $method -Body $JSON1 -ContentType 'application/json' -Headers $header

        }
        '2' {
            $Payload = @{
                kind   = "vm"
                length = 500
                offset = 0
            } 
            $JSON2 = $Payload | convertto-json
            write-host "Running query 1"
            $cluster += Invoke-RestMethod -Uri $uri -Method $method -Body $JSON2 -ContentType 'application/json' -Headers $header
            $Payload = @{
                kind   = "vm"
                length = 500
                offset = 500
            } 
            $JSON3 = $Payload | convertto-json
            write-host "Running query 2"
            $cluster += Invoke-RestMethod -Uri $uri -Method $method -Body $JSON3 -ContentType 'application/json' -Headers $header
        }
        '3' {
            $Payload = @{
                kind   = "vm"
                length = 500
                offset = 0
            } 
            $JSON4 = $Payload | convertto-json
            write-host "Running query 1"
            $cluster += Invoke-RestMethod -Uri $uri -Method $method -Body $JSON4 -ContentType 'application/json' -Headers $header
            $Payload = @{
                kind   = "vm"
                length = 500
                offset = 500
            } 
            $JSON5 = $Payload | convertto-json
            write-host "Running query 2"
            $cluster += Invoke-RestMethod -Uri $uri -Method $method -Body $JSON4 -ContentType 'application/json' -Headers $header        
            $Payload = @{
                kind   = "vm"
                length = 500
                offset = 1000
            } 
            $JSON6 = $Payload | convertto-json
            write-host "Running query 3"
            $cluster += Invoke-RestMethod -Uri $uri -Method $method -Body $JSON6 -ContentType 'application/json' -Headers $header
        }
        Default {Write-Host -ForegroundColor Yellow "I cannot determine how many vms there were"}
    }
}
Write-host "Now collecting all the results and putting into a custom psobject please wait..."
$names += foreach ($item in $($cluster.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"}
    [pscustomobject]@{Name = $vmName; IPs = $vmIPs; Cluster = $($item.status.cluster_reference.name)}
}
$names | Export-Csv C:\Temp\nutanix.csv -NoTypeInformation -Force