Make mentions send notifications

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/service/activity/discussion.ex

@@ -3,9 +3,12 @@ defmodule Mobilizon.Service.Activity.Discussion do
   Insert a discussion activity
   """
   alias Mobilizon.{Actors, Discussions}
-  alias Mobilizon.Discussions.Discussion
+  alias Mobilizon.Actors.Actor
+  alias Mobilizon.Discussions.{Comment, Discussion}
   alias Mobilizon.Service.Activity
-  alias Mobilizon.Service.Workers.ActivityBuilder
+  alias Mobilizon.Service.Workers.{ActivityBuilder, LegacyNotifierBuilder}
+
+  import Mobilizon.Service.Activity.Utils, only: [maybe_inserted_at: 0]
 
   @behaviour Activity
 
@@ -24,16 +27,22 @@ defmodule Mobilizon.Service.Activity.Discussion do
     author_id = Keyword.get(options, :actor_id, author.id)
     old_discussion = Keyword.get(options, :old_discussion)
 
-    ActivityBuilder.enqueue(:build_activity, %{
-      "type" => "discussion",
-      "subject" => subject,
-      "subject_params" => subject_params(discussion, subject, old_discussion),
-      "group_id" => group.id,
-      "author_id" => author_id,
-      "object_type" => "discussion",
-      "object_id" => if(subject != "discussion_deleted", do: to_string(discussion.id), else: nil),
-      "inserted_at" => DateTime.utc_now()
-    })
+    send_mention_notifications(subject, discussion, discussion.last_comment, options)
+
+    ActivityBuilder.enqueue(
+      :build_activity,
+      %{
+        "type" => "discussion",
+        "subject" => subject,
+        "subject_params" => subject_params(discussion, subject, old_discussion),
+        "group_id" => group.id,
+        "author_id" => author_id,
+        "object_type" => "discussion",
+        "object_id" =>
+          if(subject != "discussion_deleted", do: to_string(discussion.id), else: nil)
+      }
+      |> Map.merge(maybe_inserted_at())
+    )
   end
 
   def insert_activity(_, _), do: {:ok, nil}
@@ -53,4 +62,41 @@ defmodule Mobilizon.Service.Activity.Discussion do
   defp subject_params(%Discussion{} = discussion, _, _) do
     %{discussion_slug: discussion.slug, discussion_title: discussion.title}
   end
+
+  # An actor is mentionned
+  @spec send_mention_notifications(String.t(), Discussion.t(), Comment.t(), Keyword.t()) ::
+          {:ok, Oban.Job.t()} | {:ok, :skipped}
+  defp send_mention_notifications(
+         subject,
+         %Discussion{
+           id: discussion_id,
+           title: title,
+           slug: slug,
+           actor: %Actor{id: group_id, type: :Group}
+         },
+         %Comment{actor_id: actor_id, mentions: mentions},
+         _options
+       )
+       when subject in ["discussion_created", "discussion_replied"] and length(mentions) > 0 do
+    LegacyNotifierBuilder.enqueue(
+      :legacy_notify,
+      %{
+        "subject" => :discussion_mention,
+        "subject_params" => %{
+          discussion_slug: slug,
+          discussion_title: title
+        },
+        "type" => :discussion,
+        "object_type" => :discussion,
+        "author_id" => actor_id,
+        "group_id" => group_id,
+        "object_id" => to_string(discussion_id),
+        "mentions" => Enum.map(mentions, & &1.actor_id)
+      }
+    )
+
+    {:ok, :enqueued}
+  end
+
+  defp send_mention_notifications(_, _, _, _), do: {:ok, :skipped}
 end