[CmdletBinding()]
param(
    [Parameter(Mandatory=$true)]
    [string]$Username,

    [Parameter(Mandatory=$false)]
    [switch]$Wait,

    [Parameter(Mandatory=$false)]
    [int]$TimeoutMinutes=30,

    [Parameter(Mandatory=$false)]
    [int]$IntervalMinutes=1
)

try {
    Start-Transcript -Path C:\cfn\log\Test-ADUser.ps1.txt -Append
    $ErrorActionPreference = "Stop"

    $elapsedMinutes = 0.0
    $startTime = Get-Date
    $userFound = $false
    if (-not $Wait) {
        $TimeoutMinutes = 0
        $IntervalMinutes = 0
    }

    if (-not (Get-Module -ListAvailable -Name ActiveDirectory)) {
        Install-WindowsFeature RSAT-AD-PowerShell
    }

    do {
        if (Get-ADUser -Filter {sAMAccountName -eq $Username}){
            $userFound = $true
            break
        }
        Start-Sleep -Seconds $($IntervalMinutes * 60)
        $elapsedMinutes = ($(Get-Date) - $startTime).TotalMinutes
    } while (($elapsedMinutes -lt $TimeoutMinutes))

    if (-not $userFound) {
        if ($Wait) {
            throw "User account was not found within the timeout of $TimeoutMinutes minutes."
        } else {
            throw "User account was not found."
        }
    }
}
catch {
    $_ | Write-AWSQuickStartException
}