#Requires -Version 5.1
<#
    JbTecWiz Support Centre -- generated fix script

    Fault : FSMO roles are on a domain controller that is gone
    Fix   : Bring it back and transfer the roles properly
    Source: https://jbtecwiz.com/support/srv-id-fsmo

    Run as     : Elevated PowerShell
    Expect     : 40 minutes
    Risk       : medium
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    The holder can be brought back online. A transfer is always preferable
    to a seizure.

    HOW TO UNDO IT
    Roles can be transferred back the same way.

    This script walks the fix one step at a time and asks before each
    one. Steps with no command are things you do yourself -- it prints
    those and waits. Run with -DryRun to print without executing.

    --------------------------------------------------------------------
    NO WARRANTY - USE AT YOUR OWN RISK

    This script is provided by JbTecWiz as-is and with no warranty of any
    kind, express or implied. You run it entirely at your own risk.

    JbTecWiz accepts no liability for any loss or damage arising from its
    use, including but not limited to data loss, downtime, or configuration
    changes that turn out to be wrong for your system.

    You are responsible for reading this script before running it, for
    satisfying yourself that it suits the machine in front of you, and for
    having a working backup first. Some steps cannot be undone.
    --------------------------------------------------------------------
#>

[CmdletBinding()]
param(
    # Print every step and command without running anything.
    [switch]$DryRun,
    # Do not ask before each step. Read the script first if you use this.
    [switch]$Unattended
)

$ErrorActionPreference = 'Stop'
$script:Failed = 0

function Write-Rule { param([string]$Text)
    Write-Host ''
    Write-Host ('-' * 70) -ForegroundColor DarkGray
    if ($Text) { Write-Host $Text -ForegroundColor Cyan }
}

function Show-Prose { param([string]$Text, [string]$Colour = "Gray")
    if (-not $Text) { return }
    $words = $Text -split "\s+"; $line = "  "
    foreach ($w in $words) {
        if (($line.Length + $w.Length) -gt 74) { Write-Host $line -ForegroundColor $Colour; $line = "  " }
        $line += "$w "
    }
    if ($line.Trim()) { Write-Host $line -ForegroundColor $Colour }
}

function Invoke-Step {
    param(
        [int]$Number, [string]$Do, [string]$Why,
        [scriptblock]$Command, [switch]$Manual, [string]$Shell = "powershell"
    )
    Write-Rule "  Step $Number of 4"
    Show-Prose $Do "White"
    if ($Why) { Write-Host ""; Show-Prose $Why "DarkGray" }

    if ($Manual) {
        Write-Host ''
        Write-Host '  -> Do this yourself, then press Enter to carry on.' -ForegroundColor Yellow
        if (-not $Unattended -and -not $DryRun) { [void](Read-Host) }
        return
    }

    Write-Host ''
    foreach ($l in ($Command.ToString().Trim() -split "`n")) {
        Write-Host ("    " + $l.Trim()) -ForegroundColor Green
    }
    Write-Host ''

    if ($DryRun) { Write-Host "  (dry run -- not executed)" -ForegroundColor DarkGray; return }
    if (-not $Unattended) {
        $a = Read-Host "  Run this step? [Y]es / [S]kip / [Q]uit"
        if ($a -match "^[Qq]") { Write-Host "  Stopped at your request."; exit 0 }
        if ($a -match "^[Ss]") { Write-Host "  Skipped." -ForegroundColor DarkGray; return }
    }
    try { & $Command }
    catch {
        $script:Failed++
        Write-Host ("  Step $Number failed: " + $_.Exception.Message) -ForegroundColor Red
        Show-Prose "The rest of the fix may depend on this. Read the write-up before carrying on." "Red"
        if (-not $Unattended) {
            $c = Read-Host "  Carry on anyway? [y/N]"
            if ($c -notmatch "^[Yy]") { exit 1 }
        }
    }
}

Write-Rule
Write-Host '  FSMO roles are on a domain controller that is gone' -ForegroundColor White
Write-Host '  Bring it back and transfer the roles properly' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: medium   Reversible   40 minutes'
Write-Host ''
Show-Prose 'No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.' 'DarkYellow'
Write-Rule

if (-not $Unattended -and -not $DryRun) {
    $go = Read-Host '  Ready? [y/N]'
    if ($go -notmatch "^[Yy]") { Write-Host "  Nothing was changed."; exit 0 }
}

Invoke-Step -Number 1 -Do 'Find out where each role currently sits.' -Command {
    netdom query fsmo
    Get-ADForest | Format-List SchemaMaster,DomainNamingMaster
    Get-ADDomain | Format-List PDCEmulator,RIDMaster,InfrastructureMaster
}

Invoke-Step -Number 2 -Do 'Bring the holder online and confirm replication is healthy before transferring.' -Command {
    repadmin /replsummary
    dcdiag /s:DC01 /v | Select-String -Pattern 'failed|passed test' | Select-Object -First 40
}

Invoke-Step -Number 3 -Do 'Transfer the roles to the intended controller.' -Why 'A transfer is a negotiated handover: both controllers agree and the old holder stops claiming the role. A seizure is unilateral and leaves the old holder believing it is still the owner, which is why it must never be brought back onto the network afterwards.' -Command {
    Move-ADDirectoryServerOperationMasterRole -Identity DC02 -OperationMasterRole PDCEmulator,RIDMaster,InfrastructureMaster,SchemaMaster,DomainNamingMaster
}

Invoke-Step -Number 4 -Do 'Verify and let replication settle.' -Command {
    netdom query fsmo
    repadmin /syncall /AdeP
}

Write-Rule "  Confirm it worked"
Show-Prose 'netdom query fsmo names the intended controller for all five roles and dcdiag passes.' 'White'
Write-Host ''
if (-not $DryRun) {
    netdom query fsmo; dcdiag /test:knowsofroleholders /v | Select-String 'passed|failed'
}

Write-Rule
if ($script:Failed -gt 0) {
    Write-Host ("  Finished with " + $script:Failed + " failed step(s).") -ForegroundColor Yellow
    Show-Prose 'Read the full write-up at https://jbtecwiz.com/support/srv-id-fsmo' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Roles can be transferred back the same way.' 'DarkGray'
Write-Rule