param(
  [string]$CandidatesPath = "artifacts\music-template-extraction\candidates.json",
  [string]$OutputDir = "artifacts\music-template-extraction\review"
)

$ErrorActionPreference = "Stop"
$data = Get-Content -Raw -Encoding UTF8 -LiteralPath $CandidatesPath | ConvertFrom-Json
$probe = $null
try {
  $probe = New-Object -ComObject KWPP.Application
  try { $probe.Quit() } catch {}
} catch {
  $fallback = Join-Path $PSScriptRoot "render_music_template_candidates.py"
  $python = Get-Command python -ErrorAction Stop
  & $python.Source $fallback $CandidatesPath $OutputDir
  exit $LASTEXITCODE
} finally {
  if ($probe) { [Runtime.InteropServices.Marshal]::ReleaseComObject($probe) | Out-Null }
}
$quotas = @{ child = 7; general = 12; traditional = 7; activity = 7; stage = 7; theory = 7 }
$seenNames = @{}
$seenSignatures = @{}
$selected = [System.Collections.Generic.List[object]]::new()

foreach ($scene in $quotas.Keys) {
  $count = 0
  $items = $data.items | Where-Object {
    $_.scene -eq $scene -and $_.score -ge 78 -and $_.slides -ge 10 -and $_.slides -le 60 -and
    $_.size_mb -le 250 -and $_.median_text -le 120
  } | Sort-Object score -Descending
  foreach ($item in $items) {
    if ($count -ge $quotas[$scene]) { break }
    if ($seenNames.ContainsKey($item.name_key) -or $seenSignatures.ContainsKey($item.signature)) { continue }
    $seenNames[$item.name_key] = $true
    $seenSignatures[$item.signature] = $true
    $selected.Add($item)
    $count += 1
  }
}

New-Item -ItemType Directory -Force -Path $OutputDir | Out-Null
$OutputDir = (Resolve-Path -LiteralPath $OutputDir).Path
$rendered = [System.Collections.Generic.List[object]]::new()
for ($candidateIndex = 0; $candidateIndex -lt $selected.Count; $candidateIndex += 1) {
    $item = $selected[$candidateIndex]
    $id = "candidate-{0:d2}" -f ($candidateIndex + 1)
    $candidateDir = Join-Path $OutputDir $id
    New-Item -ItemType Directory -Force -Path $candidateDir | Out-Null
    $app = $null
    $deck = $null
    try {
      $app = New-Object -ComObject KWPP.Application
      try { $app.Visible = $false } catch {}
      $deck = $app.Presentations.Open($item.path, $true, $true, $false)
      $slideCount = $deck.Slides.Count
      $indexes = @(1, [int][math]::Max(2, [math]::Round($slideCount * 0.25)), [int][math]::Max(2, [math]::Round($slideCount * 0.5)), [int][math]::Max(2, [math]::Round($slideCount * 0.75)), [int]$slideCount) | Sort-Object -Unique
      foreach ($slideIndex in $indexes) {
        $slideIndex = [int]$slideIndex
        $target = Join-Path $candidateDir ("slide-{0:d2}.jpg" -f $slideIndex)
        $deck.Slides.Item($slideIndex).Export($target, "JPG", 640, 360)
      }
      $rendered.Add([pscustomobject]@{
        id = $id
        name = $item.name
        scene = $item.scene
        score = $item.score
        source = $item.path
        slides = $slideCount
        samples = @($indexes | ForEach-Object { "slide-{0:d2}.jpg" -f $_ })
      })
      Write-Host "$id`t$($item.scene)`t$($item.name)"
    }
    catch {
      Write-Warning "$id render failed: $($_.Exception.Message)"
    }
    finally {
      if ($null -ne $deck) { try { $deck.Close() } catch {} }
      if ($null -ne $app) { try { $app.Quit() } catch {} }
      if ($null -ne $deck) { [System.Runtime.InteropServices.Marshal]::FinalReleaseComObject($deck) | Out-Null }
      if ($null -ne $app) { [System.Runtime.InteropServices.Marshal]::FinalReleaseComObject($app) | Out-Null }
      [gc]::Collect()
      [gc]::WaitForPendingFinalizers()
    }
}
@{ items = $rendered } | ConvertTo-Json -Depth 5 | Set-Content -LiteralPath (Join-Path $OutputDir "manifest.json") -Encoding UTF8