feat: D1-15 implement drag-and-drop image chain (import+thumbnails+link+insert) with tests

lib/bds/desktop/shell_live/editor_image_drop.ex

@@ -0,0 +1,110 @@
+defmodule BDS.Desktop.ShellLive.EditorImageDrop do
+  @moduledoc false
+
+  # Implements the drag-and-drop image chain described in
+  # action_patterns.allium DragDropImageChain (trigger: editor_post.allium
+  # PostDragDropImage). A single image file dropped on the post editor body
+  # runs four synchronous steps the user waits on, then two background steps
+  # whose results are auto-applied without a modal.
+
+  require Logger
+
+  alias BDS.{AI, Media, Metadata, Posts}
+
+  @doc """
+  Synchronous portion of the chain (steps 1-4):
+
+    1. importMedia(file) -> media record + file copy + base sidecar
+    2. generateThumbnails(media) -> small/medium/large/ai (done inside import_media)
+    3. linkMediaToPost(media, post) -> update sidecar linkedPostIds
+    4. caller inserts the returned markdown at the cursor
+
+  Returns `{:ok, media, markdown}` where `markdown` is the reference inserted at
+  the cursor. These steps are not AI activities, so they run regardless of
+  airplane mode.
+  """
+  @spec import_and_link(String.t(), String.t(), String.t()) ::
+          {:ok, Media.Media.t(), String.t()} | {:error, term()}
+  def import_and_link(project_id, post_id, source_path) do
+    with {:ok, media} <-
+           Media.import_media(%{project_id: project_id, source_path: source_path}),
+         {:ok, _link} <- Media.link_media_to_post(media.id, post_id) do
+      {:ok, media, markdown_for(media)}
+    end
+  end
+
+  @doc """
+  Markdown reference inserted at the cursor (step 4): `![](bds-media://id)` for
+  images, a plain link for other file types.
+  """
+  @spec markdown_for(Media.Media.t()) :: String.t()
+  def markdown_for(media) do
+    if String.starts_with?(media.mime_type || "", "image/") do
+      "![](bds-media://#{media.id})"
+    else
+      "[#{media.original_name}](bds-media://#{media.id})"
+    end
+  end
+
+  @doc """
+  Background portion of the chain (steps 5-6), gated behind airplane mode:
+
+    5. aiImageAnalysis(media) -> results auto-applied to media metadata (no modal)
+    6. if auto-translate enabled (post.do_not_translate == false):
+         translateMediaMetadata(media, lang) for each blog language
+
+  Only runs for images. Failures are logged and never roll back the import.
+  """
+  @spec enrich(Media.Media.t(), String.t(), String.t()) :: :ok
+  def enrich(media, post_id, language) do
+    if image?(media) do
+      with {:ok, result} <- AI.analyze_image(media.id, language: language),
+           {:ok, _updated} <-
+             Media.update_media(media.id, %{
+               title: result.title,
+               alt: result.alt,
+               caption: result.caption
+             }) do
+        maybe_translate(media.id, post_id, language)
+      else
+        {:error, reason} ->
+          Logger.warning("Drag-drop AI analysis failed for #{media.id}: #{inspect(reason)}")
+      end
+    end
+
+    :ok
+  end
+
+  defp maybe_translate(media_id, post_id, language) do
+    post = Posts.get_post(post_id)
+
+    if post && not post.do_not_translate do
+      translate_targets(post.project_id, language)
+      |> Enum.each(fn target ->
+        case AI.translate_media(media_id, target) do
+          {:ok, translation} ->
+            Media.upsert_media_translation(media_id, target, %{
+              title: translation.title,
+              alt: translation.alt,
+              caption: translation.caption
+            })
+
+          {:error, reason} ->
+            Logger.warning(
+              "Drag-drop media translation failed for #{media_id} -> #{target}: #{inspect(reason)}"
+            )
+        end
+      end)
+    end
+  end
+
+  defp translate_targets(project_id, language) do
+    {:ok, metadata} = Metadata.get_project_metadata(project_id)
+
+    [metadata.main_language | metadata.blog_languages || []]
+    |> Enum.reject(&(&1 == language or is_nil(&1)))
+    |> Enum.uniq()
+  end
+
+  defp image?(media), do: String.starts_with?(media.mime_type || "", "image/")
+end