[CmdletBinding()]
param(
    [Parameter(Mandatory=$True,Position=0,HelpMessage="The script will output to .CSV datastore statistics for the provided vCenter Server hostname or FQDN")]
    [string]$vCenter
    )

Import-Module VMware.VimAutomation.Core | Out-Null

try {
    Connect-VIServer -Server $vCenter -Protocol https -Force -ErrorVariable err -ErrorAction SilentlyContinue | Out-Null
} catch { 
    Out-Null
} finally {
    if ($err.Count -eq 0) {
        Write-Output "Fetching DataStore statistics..."

        $datastores = get-datastore
        $report = foreach ($store in $datastores) {
            $store | Select @{N='Datacenter';E={$_.Datacenter.Name}},
                @{N='DSCluster';E={Get-DatastoreCluster -Datastore $_ | Select -ExpandProperty Name}},
                Name,CapacityGB,@{N='FreespaceGB';E={[math]::Round($_.FreespaceGB,2)}},
                @{N='VMCount';E={$_.ExtensionData.VM.Count}},
                @{N='ProvisionedSpaceGB';E={[math]::Round(($_.ExtensionData.Summary.Capacity - $_.Extensiondata.Summary.FreeSpace + $_.ExtensionData.Summary.Uncommitted)/1GB,2)}},
                @{N='UnCommittedGB';E={[math]::Round($_.ExtensionData.Summary.Uncommitted/1GB,2)}},
                @{N='FreeGB/CapacityGB %';E={[math]::Round(($_.FreespaceGB/$_.CapacityGB)*100,2  -f 000.00)}},
                @{N='ProvisionedGB/CapacityGB %';E={[math]::Round(($_.ExtensionData.Summary.Capacity - $_.Extensiondata.Summary.FreeSpace + $_.ExtensionData.Summary.Uncommitted)/$_.CapacityGB/1GB*100,2 -f 000.00)}}
            }
            $report | Sort-Object -Property 'ProvisionedGB/CapacityGB %' | Export-Csv datastore-stats.CSV -NoTypeInformation -UseCulture 
            ls datastore-stats.CSV
            disconnect-viserver -Confirm:$false
    } else { 
        Write-Output "failed to connect to ${vCenter}. Exiting."
        Exit
    }
}