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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.MigrationHelper.LegacyActivity do
+  @moduledoc """
+  Legacy "activities" schema needed for old migrations.
+  """
+  use Ecto.Schema
+
+  alias Pleroma.Activity.Queries
+  alias Pleroma.Bookmark
+  alias Pleroma.MigrationHelper.LegacyActivity, as: Activity
+  alias Pleroma.Notification
+  alias Pleroma.Object
+  alias Pleroma.Repo
+  alias Pleroma.ReportNote
+  alias Pleroma.User
+
+  import Ecto.Query
+
+  @type t :: %__MODULE__{}
+  @type actor :: String.t()
+
+  @primary_key {:id, FlakeId.Ecto.CompatType, autogenerate: true}
+
+  schema "activities" do
+    field(:data, :map)
+    field(:local, :boolean, default: true)
+    field(:actor, :string)
+    field(:recipients, {:array, :string}, default: [])
+    field(:thread_muted?, :boolean, virtual: true)
+
+    # A field that can be used if you need to join some kind of other
+    # id to order / paginate this field by
+    field(:pagination_id, :string, virtual: true)
+
+    # This is a fake relation,
+    # do not use outside of with_preloaded_user_actor/with_joined_user_actor
+    has_one(:user_actor, User, on_delete: :nothing, foreign_key: :id)
+    # This is a fake relation, do not use outside of with_preloaded_bookmark/get_bookmark
+    has_one(:bookmark, Bookmark, foreign_key: :activity_id)
+    # This is a fake relation, do not use outside of with_preloaded_report_notes
+    has_many(:report_notes, ReportNote, foreign_key: :activity_id)
+    has_many(:notifications, Notification, on_delete: :delete_all, foreign_key: :activity_id)
+
+    # Attention: this is a fake relation, don't try to preload it blindly and expect it to work!
+    # The foreign key is embedded in a jsonb field.
+    #
+    # To use it, you probably want to do an inner join and a preload:
+    #
+    # ```
+    # |> join(:inner, [activity], o in Object,
+    #      on: fragment("(?->>'id') = COALESCE((?)->'object'->> 'id', (?)->>'object')",
+    #        o.data, activity.data, activity.data))
+    # |> preload([activity, object], [object: object])
+    # ```
+    #
+    # As a convenience, Activity.with_preloaded_object() sets up an inner join and preload for the
+    # typical case.
+    has_one(:object, Object, on_delete: :nothing, foreign_key: :id)
+
+    timestamps()
+  end
+
+  def with_joined_object(query, join_type \\ :inner) do
+    join(query, join_type, [activity], o in Object,
+      on:
+        fragment(
+          "(?->>'id') = COALESCE(?->'object'->>'id', ?->>'object')",
+          o.data,
+          activity.data,
+          activity.data
+        ),
+      as: :object
+    )
+  end
+
+  def with_preloaded_object(query, join_type \\ :inner) do
+    query
+    |> has_named_binding?(:object)
+    |> if(do: query, else: with_joined_object(query, join_type))
+    |> preload([activity, object: object], object: object)
+  end
+
+  def all_by_ids_with_object(ids) do
+    Activity
+    |> where([a], a.id in ^ids)
+    |> with_preloaded_object()
+    |> Repo.all()
+  end
+
+  @doc """
+  Accepts `ap_id` or list of `ap_id`.
+  Returns a query.
+  """
+  @spec create_by_object_ap_id(String.t() | [String.t()]) :: Ecto.Queryable.t()
+  def create_by_object_ap_id(ap_id) do
+    Activity
+    |> Queries.by_object_id(ap_id)
+    |> Queries.by_type("Create")
+  end
+end