function Get-DomainControllers([string]$BaseDN){
    $strFilter = "(&(objectCategory=Computer))"

    $objDomain = New-Object System.DirectoryServices.DirectoryEntry("LDAP://ou=domain controllers,"+ $BaseDN)

    $objSearcher = New-Object System.DirectoryServices.DirectorySearcher
    $objSearcher.SearchRoot = $objDomain
    $objSearcher.PageSize = 1000
    $objSearcher.Filter = $strFilter
    $objSearcher.SearchScope = "Subtree"

    $colResults = $objSearcher.FindAll()
    $dc = @()
    foreach($objResult in $colResults){
        $objItem = $objResult.Properties
        $dc += $objItem.name
    }

    return $dc
}

function Run-Report([string]$computer){
    $path = "C:\Users\lfalk\Desktop\AD_Helth_Check\"+$computer+"\"
    if ((Test-Path -path $path) -ne $true)
    {
        New-Item $path -type directory
    }

    $tempPath = $path+"DCDiag.txt"
    echo "**** Running DCDiag Status ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { dcdiag /v } >> $tempPath

    $tempPath = $path+"Global_Catalog.txt"
    echo "**** Finding Global Catalogs ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { dsquery server -isgc } >> $tempPath

    $tempPath = $path+"DNS_TEST.txt"
    echo "**** Running DCDiag DNS Test ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { dcdiag /test:dns } >> $tempPath

    $tempPath = $path+"DNS_Registration.txt"
    echo "**** Test DNS Registration ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { dcdiag /test:registerindns /dnsdomain:omni.lan } >> $tempPath

    $tempPath = $path+"Network_Diag.txt"
    echo "**** Network Connectivity Tester ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { netdiag /v } >> $tempPath

    $tempPath = $path+"Verify_Trust.txt"
    echo "**** Verify Trust Relationships ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { netdom query /verify trust } >> $tempPath

    $tempPath = $path+"Show_Replications.txt"
    echo "**** Show Replication and if it was successful or not ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { repadmin /showreps } >> $tempPath

    $tempPath = $path+"Replication_Errors.txt"
    echo "**** Replicatoin Errors check ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { repadmin /replsum /errorsonly } >> $tempPath

    $tempPath = $path+"DHCP_Servers.txt"
    echo "**** verify the DHCP server count and names ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { Netsh dhcp show server } >> $tempPath

    $tempPath = $path+"GPO_Status.txt"
    echo "**** Checking GPO Status ****" > $tempPath
    Invoke-Command -ComputerName $computer -ScriptBlock { gpotool /v } >> $tempPath

}


$DCs = Get-DomainControllers("dc=omni,dc=lan")

foreach($DC in $DCs){
    Start-Job { Run-Report($DC) }
}