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[CmdletBinding(SupportsShouldProcess)]
param(
    [Parameter(Position = 0)]
    [string]$Path,
    [Parameter(Position = 1)]
    [string[]]$Name,

    [ValidateScript({ Test-Path -LiteralPath $_ -PathType Leaf })]
    [string]$NameFile,

    [switch]$NoBanner
)


if (-not $NoBanner) {
    Write-Host ''
    Write-Host '==============================' -ForegroundColor Cyan
    Write-Host '    Mass Folder Creation'       -ForegroundColor Cyan
    Write-Host '==============================' -ForegroundColor Cyan
    Write-Host ''
}


while ([string]::IsNullOrWhiteSpace($Path)) {
    $Path = (Read-Host 'Parent directory (e.g. D:\Projects)').Trim().Trim('"')
}

if ($NameFile) {
    $Name = @($Name) + @(
        Get-Content -LiteralPath $NameFile |
            ForEach-Object { $_.Trim() } |
            Where-Object { $_ }
    ) | Where-Object { $_ }
}

while (-not $Name) {
    $answer = Read-Host 'Folder names, separated by commas (e.g. Docs, Scripts, Backups)'
    $Name = $answer -split ',' |
        ForEach-Object { $_.Trim().Trim('"') } |
        Where-Object { $_ }
}


# Reject characters Windows does not allow in folder names
$invalid = [IO.Path]::GetInvalidFileNameChars() | Where-Object { $_ -notin '\', '/' }
$invalidPattern = '[{0}]' -f [regex]::Escape(-join $invalid)

# Make sure the parent exists
if (-not (Test-Path -LiteralPath $Path)) {
    if ($PSCmdlet.ShouldProcess($Path, 'Create parent directory')) {
        New-Item -ItemType Directory -Path $Path -Force | Out-Null
    }
}

$created = 0; $skipped = 0; $failed = 0

foreach ($folder in $Name) {
    if ($folder -match $invalidPattern) {
        Write-Warning "Skipping '$folder': contains invalid characters."
        $failed++
        continue
    }

    $target = Join-Path -Path $Path -ChildPath $folder

    if (Test-Path -LiteralPath $target) {
        Write-Verbose "Exists, skipping: $target"
        $skipped++
        continue
    }

    if ($PSCmdlet.ShouldProcess($target, 'Create directory')) {
        try {
            New-Item -ItemType Directory -Path $target -ErrorAction Stop | Out-Null
            Write-Host "Created: $target" -ForegroundColor Green
            $created++
        }
        catch {
            Write-Warning "Failed to create '$target': $($_.Exception.Message)"
            $failed++
        }
    }
}

Write-Host "`nDone. Created: $created | Skipped (already existed): $skipped | Failed: $failed"


    }