import JSZip from 'jszip'
import type { ZipEntry } from '@/types/images'

const IMAGE_EXTS = new Set(['heic', 'heif', 'jpg', 'jpeg', 'png'])

/**
 * Extrait toutes les images d'un fichier ZIP.
 * Structure attendue : dossier-ref/image.ext (le nom du dossier = référence produit).
 */
export async function readImagesFromZip(file: File): Promise<ZipEntry[]> {
  const zip = await JSZip.loadAsync(file)

  const entries: Array<{ relativePath: string; entry: JSZip.JSZipObject }> = []
  zip.forEach((relativePath, entry) => {
    if (!entry.dir) entries.push({ relativePath, entry })
  })

  const results: ZipEntry[] = []

  for (const { relativePath, entry } of entries) {
    if (relativePath.startsWith('__MACOSX/')) continue

    const parts = relativePath.split('/').filter((p) => p.length > 0)
    const filename = parts[parts.length - 1]
    if (filename.startsWith('.')) continue

    const dotIdx = filename.lastIndexOf('.')
    if (dotIdx === -1) continue
    const ext = filename.slice(dotIdx + 1).toLowerCase()
    if (!IMAGE_EXTS.has(ext)) continue

    const folder = parts.length > 1 ? parts[0] : filename.slice(0, dotIdx)
    const isHeic = ext === 'heic' || ext === 'heif'
    const mimeType = isHeic
      ? 'image/heic'
      : ext === 'jpg' || ext === 'jpeg'
        ? 'image/jpeg'
        : 'image/png'

    const rawBlob = await entry.async('blob')
    const blob = new Blob([rawBlob], { type: mimeType })

    results.push({ folder, filename: filename.slice(0, dotIdx), ext, blob, isHeic })
  }

  return results
}