import { downscaleImage } from './image-downscale'

function file(name: string, type: string, bytes = 100) {
  return new File([new Uint8Array(bytes)], name, { type })
}

describe('downscaleImage (best-effort, jsdom has no canvas/createImageBitmap)', () => {
  it('returns non-image files untouched', async () => {
    const f = file('deck.pdf', 'application/pdf')
    expect(await downscaleImage(f)).toBe(f)
  })

  it('returns GIFs untouched (may be animated)', async () => {
    const f = file('anim.gif', 'image/gif')
    expect(await downscaleImage(f)).toBe(f)
  })

  it('returns SVGs untouched (vector)', async () => {
    const f = file('logo.svg', 'image/svg+xml')
    expect(await downscaleImage(f)).toBe(f)
  })

  it('falls back to the original image when the environment cannot rasterize', async () => {
    // In jsdom createImageBitmap is undefined → best-effort returns original.
    const f = file('photo.png', 'image/png', 5_000_000)
    expect(await downscaleImage(f)).toBe(f)
  })
})