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

    Fault : "No Remote Desktop license servers available"
    Fix   : Stand up and activate a licence server
    Source: https://jbtecwiz.com/support/srv-rds-licensing

    Run as     : Elevated PowerShell
    Expect     : 1-2 hours
    Risk       : medium
    Reversible : yes

    WHEN THIS IS THE RIGHT FIX
    There is no licence server. Note that the grace period cannot be
    extended or reset -- you need real CALs.

    HOW TO UNDO IT
    Uninstall-WindowsFeature RDS-Licensing. Activated CALs stay tied to that
    server, so plan this before installing them.

    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 5"
    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 '  "No Remote Desktop license servers available"' -ForegroundColor White
Write-Host '  Stand up and activate a licence server' -ForegroundColor Cyan
Write-Host ''
Write-Host '  Risk: medium   Reversible   1-2 hours'
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 'Install the role.' -Command {
    Install-WindowsFeature RDS-Licensing, RDS-Licensing-UI
}

Invoke-Step -Number 2 -Do 'Activate the server through the RD Licensing Manager wizard -- it needs to talk to Microsoft, by internet, web browser or phone.' -Manual

Invoke-Step -Number 3 -Do 'Install the CALs you have purchased, choosing Per User or Per Device to match your agreement.' -Manual

Invoke-Step -Number 4 -Do 'In an AD domain, add the licence server to the Terminal Server License Servers group so it can track Per User CALs.' -Why 'Per User CAL tracking writes to the user object in AD. Without this membership the server issues licences but cannot record them, and reporting is wrong.' -Command {
    Add-ADGroupMember -Identity 'Terminal Server License Servers' -Members 'RDLIC$'
}

Invoke-Step -Number 5 -Do 'Point the session hosts at it using the previous fix.' -Manual

Write-Rule "  Confirm it worked"
Show-Prose 'RD Licensing Diagnoser reports no issues and users connect.' 'White'

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-rds-licensing' 'Yellow'
} else {
    Write-Host '  Finished.' -ForegroundColor Green
}
Write-Host ''
Show-Prose 'To undo: Uninstall-WindowsFeature RDS-Licensing. Activated CALs stay tied to that server, so plan this before installing them.' 'DarkGray'
Write-Rule