Introduce the group activity section

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

lib/graphql/schema/activity.ex

@@ -0,0 +1,78 @@
+defmodule Mobilizon.GraphQL.Schema.ActivityType do
+  @moduledoc """
+  Schema representation for Activity
+  """
+  use Absinthe.Schema.Notation
+
+  alias Mobilizon.Actors.{Actor, Member}
+  alias Mobilizon.Discussions.Discussion
+  alias Mobilizon.Events.Event
+  alias Mobilizon.Posts.Post
+  alias Mobilizon.Resources.Resource
+
+  enum :activity_type do
+    value(:event, description: "Activities concerning events")
+    value(:post, description: "Activities concerning posts")
+    value(:discussion, description: "Activities concerning discussions")
+    value(:resource, description: "Activities concerning resources")
+    value(:group, description: "Activities concerning group settings")
+    value(:member, description: "Activities concerning members")
+  end
+
+  object :activity_param_item do
+    field(:key, :string)
+    field(:value, :string)
+  end
+
+  interface :activity_object do
+    field(:id, :id)
+
+    resolve_type(fn
+      %Event{}, _ ->
+        :event
+
+      %Post{}, _ ->
+        :post
+
+      %Actor{type: "Group"}, _ ->
+        :group
+
+      %Member{}, _ ->
+        :member
+
+      %Resource{}, _ ->
+        :resource
+
+      %Discussion{}, _ ->
+        :discussion
+
+      %Actor{type: :Group}, _ ->
+        :group
+
+      _, _ ->
+        nil
+    end)
+  end
+
+  @desc """
+  A paginated list of activity items
+  """
+  object :paginated_activity_list do
+    field(:elements, list_of(:activity), description: "A list of activities")
+    field(:total, :integer, description: "The total number of elements in the list")
+  end
+
+  object :activity do
+    field(:id, :id, description: "The activity item ID")
+    field(:inserted_at, :datetime, description: "When was the activity inserted")
+    field(:priority, :integer)
+    field(:type, :activity_type)
+    field(:subject, :string)
+    field(:subject_params, list_of(:activity_param_item))
+    field(:message, :string)
+    field(:message_params, list_of(:activity_param_item))
+    field(:object, :activity_object)
+    field(:author, :actor)
+    field(:group, :group)
+  end
+end