defmodule Weave.Image do
  @moduledoc """
  Thumbnail processing powered by Rust.

  Downloads images, resizes to 256x256 WebP thumbnails, and computes
  deterministic storage keys based on source URL SHA-256.
  """

  @doc """
  Computes the thumbnail storage key from a source URL.

  Returns `"thumbnails/{sha256_hex[0..32]}.webp"`.

  ## Examples

      iex> Weave.Image.thumbnail_key("https://example.com/photo.jpg")
      "thumbnails/" <> _rest = Weave.Image.thumbnail_key("https://example.com/photo.jpg")

  """
  defdelegate thumbnail_key(source_url), to: Weave.Native

  @doc """
  Downloads an image, resizes to 256x256 WebP, and computes the storage key.

  Returns `{:ok, {key, webp_bytes}}` or `{:error, reason}`.
  """
  defdelegate process_thumbnail(url), to: Weave.Native
end