import type { Chapter, ChapterViewModel, ImageAsset } from './types';

function countByStatus(images: ImageAsset[], status: string): number {
  return images.filter((img) => img.status === status).length;
}

export function toChapterViewModel(chapter: Chapter): ChapterViewModel {
  const images = chapter.images ?? [];
  const completedCount = countByStatus(images, 'completed');

  return {
    id: chapter.id,
    title: chapter.title,
    category: chapter.category,
    orderIndex: chapter.order_index,
    isEmpty: chapter.status === 'empty' || !chapter.content,
    isNew: chapter.is_new,
    hasImages: images.length > 0,
    allImagesReady: images.length > 0 && completedCount === images.length,
    pendingImageCount:
      countByStatus(images, 'pending') + countByStatus(images, 'processing'),
    failedImageCount: countByStatus(images, 'failed'),
    sections: chapter.sections ?? [],
    coverImageUrl: chapter.cover_image?.url ?? null,
    updatedAt: chapter.updated_at,
  };
}

export function toChapterViewModels(chapters: Chapter[]): ChapterViewModel[] {
  return chapters.map(toChapterViewModel);
}