# Build-Schritt: Glossar-Thumbnails als WebP generieren
# Quelle:  App/assets/img/glossar/*.png, *.jpg
# Ziel:    App/assets/img/glossar/thumbs/*.webp  (480x270, q=75)
# Skip-Regel: Thumb existiert UND ist neuer als Original

$ErrorActionPreference = 'Stop'

$magick = 'C:\Program Files\ImageMagick-7.1.2-Q16-HDRI\magick.exe'
if (-not (Test-Path $magick)) {
    # Fallback: PATH (falls neuere Version installiert)
    $cmd = Get-Command magick -ErrorAction SilentlyContinue
    if ($cmd) { $magick = $cmd.Source }
    else {
        Write-Error "ImageMagick nicht gefunden. Installation: winget install ImageMagick.ImageMagick"
        exit 1
    }
}

$srcDir   = 'C:\xampp\htdocs\geograsim\App\assets\img\glossar'
$thumbDir = Join-Path $srcDir 'thumbs'

if (-not (Test-Path $thumbDir)) {
    New-Item -ItemType Directory -Path $thumbDir | Out-Null
    Write-Host "Thumbs-Ordner angelegt: $thumbDir"
}

$sources = Get-ChildItem -Path $srcDir -File | Where-Object { $_.Extension -match '^\.(png|jpg|jpeg)$' }

$total       = $sources.Count
$generated   = 0
$skipped     = 0
$failed      = 0
$sumSrcBytes = 0
$sumDstBytes = 0

Write-Host ""
Write-Host "Quelle: $srcDir"
Write-Host "Ziel:   $thumbDir"
Write-Host "Files:  $total PNG/JPG gefunden"
Write-Host ('-' * 60)

foreach ($src in $sources) {
    $base    = [System.IO.Path]::GetFileNameWithoutExtension($src.Name)
    $dstPath = Join-Path $thumbDir "$base.webp"

    $needBuild = $true
    if (Test-Path $dstPath) {
        $dst = Get-Item $dstPath
        if ($dst.LastWriteTime -ge $src.LastWriteTime) {
            $needBuild = $false
        }
    }

    if (-not $needBuild) {
        $skipped++
        $sumSrcBytes += $src.Length
        $sumDstBytes += (Get-Item $dstPath).Length
        Write-Host ("[SKIP] {0}  (Thumb aktuell)" -f $src.Name)
        continue
    }

    try {
        & $magick $src.FullName -resize '480x270^' -gravity center -extent 480x270 -quality 75 $dstPath
        if ($LASTEXITCODE -ne 0) { throw "magick exit $LASTEXITCODE" }

        $dstSize  = (Get-Item $dstPath).Length
        $srcSize  = $src.Length
        $reduce   = [math]::Round((1 - $dstSize / $srcSize) * 100, 1)
        $sumSrcBytes += $srcSize
        $sumDstBytes += $dstSize
        $generated++
        Write-Host ("[GEN]  {0,-45}  {1,8:N0} B  ->  {2,7:N0} B  (-{3}%)" -f $src.Name, $srcSize, $dstSize, $reduce)
    }
    catch {
        $failed++
        Write-Host ("[FAIL] {0}  --  {1}" -f $src.Name, $_.Exception.Message) -ForegroundColor Red
    }
}

Write-Host ('-' * 60)
$srcMB = [math]::Round($sumSrcBytes / 1MB, 2)
$dstMB = [math]::Round($sumDstBytes / 1MB, 2)
$pct   = if ($sumSrcBytes -gt 0) { [math]::Round((1 - $sumDstBytes / $sumSrcBytes) * 100, 1) } else { 0 }

Write-Host ""
Write-Host ("Generiert : {0}" -f $generated)
Write-Host ("Skipped   : {0}" -f $skipped)
Write-Host ("Failed    : {0}" -f $failed)
Write-Host ("Total     : {0} / {1}" -f ($generated + $skipped + $failed), $total)
Write-Host ""
Write-Host ("Originale : {0} MB" -f $srcMB)
Write-Host ("Thumbs    : {0} MB" -f $dstMB)
Write-Host ("Ersparnis : -{0}%" -f $pct)