import type { AssetManager } from '@/lib/assets/assetManager'

export type AssetMetaItem = {
  originalName: string
  mimeType: string
  size: number
  hash8: string
  ext: string
  zipPath: string
  integrity: string
  group: 'images' | 'fonts' | 'other'
  referencedAt: string[]
}

export function buildAssetsMetadata(am: AssetManager): Uint8Array {
  const list = am.list()
  const referenced = new Set(am.referencedList())
  const items: AssetMetaItem[] = list.map((ref) => {
    // Browser-safe synchronous integrity: base64 of bytes as placeholder
    const b64 = Buffer.from(ref.bytes).toString('base64')
    const group: 'images' | 'fonts' | 'other' = ref.mimeType.startsWith('image/')
      ? 'images'
      : ref.mimeType.startsWith('font/')
      ? 'fonts'
      : 'other'
    const referencedAt = referenced.has(ref.originalName) ? [`local:${ref.originalName}`] : []
    return {
      originalName: ref.originalName,
      mimeType: ref.mimeType,
      size: ref.bytes.byteLength,
      hash8: ref.hash8,
      ext: ref.ext,
      zipPath: ref.path,
      integrity: `sha256-${b64}`,
      group,
      referencedAt,
    }
  })
  const json = JSON.stringify({ assets: items }, null, 2)
  return new TextEncoder().encode(json)
}