#requires -Version 5.1
<#
Generate .rdp files for each PC from clientpc.csv.
Output directory defaults to .\RDP under the current directory.
#>

[CmdletBinding(SupportsShouldProcess = $true)]
param(
    [string]$ClientPcCsvPath = '.\clientpc.csv',
    [string]$RdpOutputDirectory = '.\RDP',
    [int]$DesktopWidth = 1920,
    [int]$DesktopHeight = 1080
)

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

function New-RdpShortcutFiles {
    param(
        [Parameter(Mandatory)] [string]$CsvPath,
        [Parameter(Mandatory)] [string]$OutputDirectory,
        [Parameter(Mandatory)] [int]$Width,
        [Parameter(Mandatory)] [int]$Height
    )

    $resolvedCsvPath = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($CsvPath)
    $resolvedOutputDirectory = $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($OutputDirectory)

    if (-not (Test-Path -LiteralPath $resolvedCsvPath -PathType Leaf)) {
        throw ("CSV file not found: {0}" -f $resolvedCsvPath)
    }

    if (-not (Test-Path -LiteralPath $resolvedOutputDirectory -PathType Container)) {
        if ($PSCmdlet.ShouldProcess($resolvedOutputDirectory, 'Create RDP output directory')) {
            New-Item -Path $resolvedOutputDirectory -ItemType Directory -Force | Out-Null
        }
    }

    $clients = $null
    foreach ($enc in @('UTF8', 'Default', 'Unicode', 'OEM')) {
        try {
            $tryRows = Import-Csv -LiteralPath $resolvedCsvPath -Encoding $enc
            if ($tryRows -and $tryRows.Count -gt 0) {
                $clients = $tryRows
                break
            }
        }
        catch {
            continue
        }
    }

    if (-not $clients -or $clients.Count -eq 0) {
        throw 'No rows were found in CSV.'
    }

    $columnNames = $clients[0].PSObject.Properties.Name
    if ($columnNames.Count -lt 2) {
        throw 'CSV must contain at least two columns: computer name and login id.'
    }

    $computerColumn = $columnNames[0]
    $loginIdColumn = $columnNames[1]
    $createdCount = 0

    foreach ($client in $clients) {
        $computerName = [string]$client.$computerColumn
        $loginId = [string]$client.$loginIdColumn

        if ([string]::IsNullOrWhiteSpace($computerName)) {
            Write-Warning 'Skipped a row because computer name is empty.'
            continue
        }

        $rdpFilePath = Join-Path -Path $resolvedOutputDirectory -ChildPath ("{0}.rdp" -f $computerName)
        $rdpContent = @(
            'screen mode id:i:2',
            'use multimon:i:0',
            ("desktopwidth:i:{0}" -f $Width),
            ("desktopheight:i:{0}" -f $Height),
            'session bpp:i:32',
            'prompt for credentials:i:1',
            'administrative session:i:0',
            'redirectclipboard:i:1',
            'audiomode:i:0',
            'authentication level:i:2',
            'enablecredsspsupport:i:1',
            ("full address:s:{0}" -f $computerName),
            ("username:s:{0}" -f $loginId)
        )

        if ($PSCmdlet.ShouldProcess($rdpFilePath, 'Create RDP shortcut file')) {
            Set-Content -LiteralPath $rdpFilePath -Value $rdpContent -Encoding Unicode
            $createdCount++
        }
    }

    return [PSCustomObject]@{
        OutputDirectory = $resolvedOutputDirectory
        Count = $createdCount
    }
}

$result = New-RdpShortcutFiles -CsvPath $ClientPcCsvPath -OutputDirectory $RdpOutputDirectory -Width $DesktopWidth -Height $DesktopHeight
Write-Host ("Created RDP files: {0} / Output: {1}" -f $result.Count, $result.OutputDirectory) -ForegroundColor Green