$ErrorActionPreference = 'Stop'

$root = (Resolve-Path (Join-Path $PSScriptRoot '..\..')).Path
$docDir = Join-Path $root 'doc'
$source = Get-ChildItem -LiteralPath $docDir -Filter '*.docx' | Sort-Object Length -Descending | Select-Object -First 1
if (-not $source) { throw 'doc目录中未找到待导出的DOCX文件' }
$docxPath = $source.FullName
$pdfPath = Join-Path $docDir ($source.BaseName + '.pdf')
$tempDocxPath = Join-Path $PSScriptRoot 'revised-manual-for-pdf.docx'

Copy-Item -LiteralPath $docxPath -Destination $tempDocxPath -Force

$word = $null
$doc = $null
try {
    $word = New-Object -ComObject Word.Application
    $word.Visible = $false
    $word.DisplayAlerts = 0
    $doc = $word.Documents.Open($tempDocxPath, $false, $false)
    if ($doc.TablesOfContents.Count -gt 0) {
        for ($index = 1; $index -le $doc.TablesOfContents.Count; $index++) {
            try { $doc.TablesOfContents.Item($index).Update() } catch { }
        }
    }
    $doc.Save()
    $doc.ExportAsFixedFormat($pdfPath, 17)
    Write-Output "DOCX=$docxPath"
    Write-Output "PDF=$pdfPath"
}
finally {
    if ($doc) { try { $doc.Close($false) } catch { } }
    if ($word) { try { $word.Quit() } catch { } }
    if ($doc) { [void][Runtime.InteropServices.Marshal]::ReleaseComObject($doc) }
    if ($word) { [void][Runtime.InteropServices.Marshal]::ReleaseComObject($word) }
    [GC]::Collect()
    [GC]::WaitForPendingFinalizers()
    if (Test-Path -LiteralPath $tempDocxPath) { Remove-Item -LiteralPath $tempDocxPath -Force -ErrorAction SilentlyContinue }
}