import { describe, it, expect } from 'vitest'
import { AssetManager } from '@/lib/assets/assetManager'
import { buildAssetsMetadata, type AssetMetaItem } from '@/lib/exporter/assets.meta'

function u8(n: number): Uint8Array {
  const arr = new Uint8Array(n)
  for (let i = 0; i < n; i++) arr[i] = (i * 17) & 0xff
  return arr
}

describe('referencedAt is populated when rewriteUrl is used', () => {
  it('marks originalName as referenced via local:<name>', async () => {
    const am = new AssetManager({ maxBytes: 1024 * 1024, allowedExts: ['png'] })
    await am.add({ name: 'hero.png', type: 'image/png', bytes: u8(16) })
    // use rewriteUrl to simulate page referencing the local asset
    const rewritten = am.rewriteUrl('local:hero.png')
    expect(rewritten).toMatch(/assets\//)
    const metaBytes = buildAssetsMetadata(am)
    const obj = JSON.parse(new TextDecoder().decode(metaBytes)) as { assets: AssetMetaItem[] }
    expect(obj.assets.length).toBe(1)
    const a = obj.assets[0]
    expect(Array.isArray(a.referencedAt)).toBe(true)
    expect(a.referencedAt).toContain('local:hero.png')
  })
})