// Hook: AfterPowerPoint
// Remove draft slides and any slide marked Hidden in the source deck.
//
// A draft slide is identified by its first shape having a name that starts
// with "_DRAFT" - a convention authors use to leave reviewer notes or
// internal-only content in the source. Hidden slides are also removed. If
// removing them would leave an empty deck, the job halts with an error.

if (Presentation == null)
{
    AddError($"No presentation available for '{OutputName}'.");
    return;
}

var removed = new List<int>();

for (int i = Presentation.Slides.Count - 1; i >= 0; i--)
{
    var slide = Presentation.Slides[i];
    bool isDraft = slide.Shapes.Count > 0
        && (slide.Shapes[0].Name?.StartsWith("_DRAFT", StringComparison.OrdinalIgnoreCase) ?? false);
    bool isHidden = slide.Hidden;

    if (isDraft || isHidden)
    {
        Presentation.Slides.RemoveAt(i);
        removed.Add(i + 1);
    }
}

if (Presentation.Slides.Count == 0)
{
    AddError($"All slides in '{OutputName}' were removed as drafts/hidden; refusing to ship an empty deck.");
}

if (removed.Count > 0)
{
    AddWarning($"Removed {removed.Count} draft/hidden slide(s) from '{OutputName}' (positions: {string.Join(", ", removed)}).");
}
else
{
    Logger.LogInformation($"No draft or hidden slides found in '{OutputName}'.");
}