feat: base work for post translations

test/bds/post_translations_test.exs

@@ -0,0 +1,142 @@
+defmodule BDS.PostTranslationsTest do
+  use ExUnit.Case, async: false
+
+  alias BDS.Metadata
+  alias BDS.Posts
+
+  setup do
+    :ok = Ecto.Adapters.SQL.Sandbox.checkout(BDS.Repo)
+    temp_dir = Path.join(System.tmp_dir!(), "bds-post-translations-#{System.unique_integer([:positive])}")
+    File.mkdir_p!(temp_dir)
+    on_exit(fn -> File.rm_rf(temp_dir) end)
+
+    {:ok, project} = BDS.Projects.create_project(%{name: "Translations", data_path: temp_dir})
+    %{project: project, temp_dir: temp_dir}
+  end
+
+  test "upserted post translations publish with the canonical post, reopen on edit, and delete their file", %{project: project, temp_dir: temp_dir} do
+    assert {:ok, post} =
+             Posts.create_post(%{
+               project_id: project.id,
+               title: "Canonical Post",
+               excerpt: "English summary",
+               content: "Hello world",
+               language: "en"
+             })
+
+    assert {:ok, translation} =
+             Posts.upsert_post_translation(post.id, "de", %{
+               title: "Kanonischer Beitrag",
+               excerpt: "Deutsche Zusammenfassung",
+               content: "Hallo Welt"
+             })
+
+    assert translation.translation_for == post.id
+    assert translation.language == "de"
+    assert translation.status == :draft
+    assert translation.file_path == ""
+    assert translation.content == "Hallo Welt"
+
+    assert {:ok, [listed_translation]} = Posts.list_post_translations(post.id)
+    assert listed_translation.id == translation.id
+
+    assert {:ok, _published_post} = Posts.publish_post(post.id)
+    assert published_translation = Posts.get_post_translation!(translation.id)
+
+    assert published_translation.status == :published
+    assert is_integer(published_translation.published_at)
+    assert published_translation.content == nil
+    assert published_translation.file_path =~ ~r/^posts\/\d{4}\/\d{2}\/canonical-post\.de\.md$/
+
+    translation_path = Path.join(temp_dir, published_translation.file_path)
+    assert File.exists?(translation_path)
+
+    translation_contents = File.read!(translation_path)
+    assert translation_contents =~ "title: Kanonischer Beitrag\n"
+    assert translation_contents =~ "language: de\n"
+    assert translation_contents =~ "status: published\n"
+    assert translation_contents =~ "\n---\nHallo Welt\n"
+
+    assert {:ok, reopened_translation} =
+             Posts.upsert_post_translation(post.id, "de", %{
+               title: "Neu formuliert",
+               excerpt: "Aktualisiert",
+               content: "Neuer Entwurf"
+             })
+
+    assert reopened_translation.status == :draft
+    assert reopened_translation.title == "Neu formuliert"
+    assert reopened_translation.excerpt == "Aktualisiert"
+    assert reopened_translation.content == "Neuer Entwurf"
+    assert reopened_translation.updated_at >= published_translation.updated_at
+
+    assert {:ok, :deleted} = Posts.delete_post_translation(reopened_translation.id)
+    refute File.exists?(translation_path)
+    assert {:ok, []} = Posts.list_post_translations(post.id)
+  end
+
+  test "validate_translations reports missing languages, orphan translation files, and do-not-translate posts", %{project: project, temp_dir: temp_dir} do
+    assert {:ok, _metadata} =
+             Metadata.update_project_metadata(project.id, %{
+               main_language: "en",
+               blog_languages: ["en", "de", "fr"]
+             })
+
+    assert {:ok, translatable_post} =
+             Posts.create_post(%{
+               project_id: project.id,
+               title: "Needs French",
+               content: "Body",
+               language: "en"
+             })
+
+    assert {:ok, _translation} =
+             Posts.upsert_post_translation(translatable_post.id, "de", %{
+               title: "Braucht Französisch",
+               content: "Inhalt"
+             })
+
+    assert {:ok, _published} = Posts.publish_post(translatable_post.id)
+
+    assert {:ok, ignored_post} =
+             Posts.create_post(%{
+               project_id: project.id,
+               title: "Skip Me",
+               content: "Body",
+               language: "en"
+             })
+
+    assert {:ok, ignored_post} = Posts.update_post(ignored_post.id, %{do_not_translate: true})
+    assert {:ok, _published_ignored_post} = Posts.publish_post(ignored_post.id)
+
+    orphan_dir = Path.join([temp_dir, "posts", "2026", "04"])
+    File.mkdir_p!(orphan_dir)
+
+    orphan_path = Path.join(orphan_dir, "orphan.fr.md")
+
+    File.write!(
+      orphan_path,
+      [
+        "---",
+        "id: orphan-translation",
+        "translation_for: missing-post",
+        "language: fr",
+        "title: Orpheline",
+        "status: published",
+        "created_at: 1711843200",
+        "updated_at: 1711929600",
+        "published_at: 1712016000",
+        "---",
+        "Texte orphelin",
+        ""
+      ]
+      |> Enum.join("\n")
+    )
+
+    assert {:ok, report} = Posts.validate_translations(project.id)
+
+    assert report.missing == [%{post_id: translatable_post.id, language: "fr"}]
+    assert report.orphan_files == ["posts/2026/04/orphan.fr.md"]
+    assert report.do_not_translate_posts == [ignored_post.id]
+  end
+end