<#
.SYNOPSIS
    Arrow-key bay picker for Wax/Trace Export / Backup / Install scripts.

.DESCRIPTION
    Reads bay-config.csv (asset_tag,ftpak_version,model,user_id) and presents
    an Up/Down picker. Returns the chosen asset_tag to stdout so the calling
    script can capture it. Always appends an "Other (manual entry)" option.

    Same UX as the WinPE select-waxtrace-asset.ps1 used by startnet.cmd.
    Distinct from that script because it returns the asset tag via stdout
    rather than writing to a file, and presents the richer per-bay columns
    (FTPak version + model + USER ID) from bay-config.csv.

.PARAMETER ConfigCsv
    Path to bay-config.csv. Defaults to a sibling file next to this script.

.PARAMETER Title
    Header text shown above the picker. Defaults to "Wax/Trace Asset".

.OUTPUTS
    String. The chosen asset_tag, printed to stdout. Empty string on cancel.

.EXAMPLE
    $asset = & .\Select-WaxtraceAsset.ps1
    $asset = & .\Select-WaxtraceAsset.ps1 -ConfigCsv 'C:\foo\bay-config.csv' -Title 'Pick bay to back up'
#>
[CmdletBinding()]
param(
    [string]$ConfigCsv = (Join-Path $PSScriptRoot 'bay-config.csv'),
    [string]$Title     = 'Wax/Trace Asset'
)

$ErrorActionPreference = 'Continue'

function Read-BayList {
    param([string]$Path)
    if (-not (Test-Path -LiteralPath $Path)) { return @() }
    try {
        return Import-Csv -LiteralPath $Path |
               Sort-Object -Property asset_tag
    } catch {
        return @()
    }
}

function Show-Menu {
    param([object[]]$Items, [int]$Selected, [string]$Title)
    Clear-Host
    Write-Host ''
    Write-Host '  ============================================================'
    Write-Host "    $Title"
    Write-Host '  ============================================================'
    Write-Host ''
    Write-Host '  Up / Down arrows = navigate, Enter = select, Esc = cancel'
    Write-Host ''
    Write-Host ('    {0,-10} {1,-8} {2,-10} {3}' -f 'ASSET', 'FTPAK', 'MODEL', 'USER ID')
    Write-Host ('    {0,-10} {1,-8} {2,-10} {3}' -f '-----', '-----', '-----', '-------')
    for ($i = 0; $i -lt $Items.Count; $i++) {
        $item = $Items[$i]
        if ($item -is [string]) {
            $line = $item
        } else {
            $line = '{0,-10} {1,-8} {2,-10} {3}' -f $item.asset_tag, $item.ftpak_version, $item.model, $item.user_id
        }
        if ($i -eq $Selected) {
            Write-Host ('  > ' + $line) -ForegroundColor Black -BackgroundColor White
        } else {
            Write-Host ('    ' + $line)
        }
    }
    Write-Host ''
}

$bays = @(Read-BayList -Path $ConfigCsv)
$menuItems = @()
foreach ($b in $bays) { $menuItems += $b }
$menuItems += '** Other (enter asset tag manually) **'

if ($menuItems.Count -eq 1) {
    # Only the manual-entry sentinel: CSV missing or unparseable. Fall back
    # to a plain prompt rather than wedging the operator in an empty menu.
    Write-Host "  (bay-config.csv not readable at $ConfigCsv - falling back to manual entry)"
    $manual = Read-Host "  Enter asset tag (e.g. WJRP9999) or blank to abort"
    if ($manual) { return $manual.Trim().ToUpper() } else { return '' }
}

$sel = 0
while ($true) {
    Show-Menu -Items $menuItems -Selected $sel -Title $Title
    $key = [System.Console]::ReadKey($true)
    switch ($key.Key) {
        'UpArrow'   { if ($sel -gt 0) { $sel-- } }
        'DownArrow' { if ($sel -lt ($menuItems.Count - 1)) { $sel++ } }
        'Enter'     {
            if ($sel -eq ($menuItems.Count - 1)) {
                Write-Host ''
                $manual = Read-Host '  Enter asset tag (e.g. WJRP9999) or blank to abort'
                if ($manual) {
                    return $manual.Trim().ToUpper()
                } else {
                    return ''
                }
            } else {
                return $bays[$sel].asset_tag
            }
        }
        'Escape'    { return '' }
    }
}