Refactor modules into contexts (#78)

* [WIP] break out a few contexts, start refactoring fast index modules

* [WIP] more contexts, this time around slow indexing and downloads

* [WIP] got all tests passing

* [WIP] Added moduledocs

* Built a genserver to rename old jobs on boot

* Added a module naming check; moved things around

* Fixed specs

test/pinchflat/downloading/downloading_helpers_test.exs

@@ -0,0 +1,75 @@
+defmodule Pinchflat.Downloading.DownloadingHelpersTest do
+  use Pinchflat.DataCase
+
+  import Mox
+  import Pinchflat.MediaFixtures
+  import Pinchflat.SourcesFixtures
+
+  alias Pinchflat.Tasks
+  alias Pinchflat.Downloading.DownloadingHelpers
+  alias Pinchflat.Downloading.MediaDownloadWorker
+
+  setup :verify_on_exit!
+
+  describe "enqueue_pending_download_tasks/1" do
+    test "it enqueues a job for each pending media item" do
+      source = source_fixture()
+      media_item = media_item_fixture(source_id: source.id, media_filepath: nil)
+
+      assert :ok = DownloadingHelpers.enqueue_pending_download_tasks(source)
+
+      assert_enqueued(worker: MediaDownloadWorker, args: %{"id" => media_item.id})
+    end
+
+    test "it does not enqueue a job for media items with a filepath" do
+      source = source_fixture()
+      _media_item = media_item_fixture(source_id: source.id, media_filepath: "some/filepath.mp4")
+
+      assert :ok = DownloadingHelpers.enqueue_pending_download_tasks(source)
+
+      refute_enqueued(worker: MediaDownloadWorker)
+    end
+
+    test "it attaches a task to each enqueued job" do
+      source = source_fixture()
+      media_item = media_item_fixture(source_id: source.id, media_filepath: nil)
+
+      assert [] = Tasks.list_tasks_for(:media_item_id, media_item.id)
+
+      assert :ok = DownloadingHelpers.enqueue_pending_download_tasks(source)
+
+      assert [_] = Tasks.list_tasks_for(:media_item_id, media_item.id)
+    end
+
+    test "it does not create a job if the source is set to not download" do
+      source = source_fixture(download_media: false)
+
+      assert :ok = DownloadingHelpers.enqueue_pending_download_tasks(source)
+
+      refute_enqueued(worker: MediaDownloadWorker)
+    end
+
+    test "it does not attach tasks if the source is set to not download" do
+      source = source_fixture(download_media: false)
+      media_item = media_item_fixture(source_id: source.id, media_filepath: nil)
+
+      assert :ok = DownloadingHelpers.enqueue_pending_download_tasks(source)
+      assert [] = Tasks.list_tasks_for(:media_item_id, media_item.id)
+    end
+  end
+
+  describe "dequeue_pending_download_tasks/1" do
+    test "it deletes all pending tasks for a source's media items" do
+      source = source_fixture()
+      media_item = media_item_fixture(source_id: source.id, media_filepath: nil)
+
+      DownloadingHelpers.enqueue_pending_download_tasks(source)
+      assert_enqueued(worker: MediaDownloadWorker, args: %{"id" => media_item.id})
+
+      assert :ok = DownloadingHelpers.dequeue_pending_download_tasks(source)
+
+      refute_enqueued(worker: MediaDownloadWorker)
+      assert [] = Tasks.list_tasks_for(:media_item_id, media_item.id)
+    end
+  end
+end