5 files changed, 87 insertions, 0 deletions
diff --git a/lib/pleroma/conversation.ex b/lib/pleroma/conversation.ex
index be5821ad7..098016af2 100644
--- a/lib/pleroma/conversation.ex
+++ b/lib/pleroma/conversation.ex
@@ -67,6 +67,8 @@ defmodule Pleroma.Conversation do
 
       participations =
         Enum.map(users, fn user ->
+          User.increment_unread_conversation_count(conversation, user)
+
           {:ok, participation} =
             Participation.create_for_user_and_conversation(user, conversation, opts)
 
diff --git a/lib/pleroma/conversation/participation.ex b/lib/pleroma/conversation/participation.ex
index e946f6de2..ab81f3217 100644
--- a/lib/pleroma/conversation/participation.ex
+++ b/lib/pleroma/conversation/participation.ex
@@ -52,6 +52,15 @@ defmodule Pleroma.Conversation.Participation do
     participation
     |> read_cng(%{read: true})
     |> Repo.update()
+    |> case do
+      {:ok, participation} ->
+        participation = Repo.preload(participation, :user)
+        User.set_unread_conversation_count(participation.user)
+        {:ok, participation}
+
+      error ->
+        error
+    end
   end
 
   def mark_as_unread(participation) do
@@ -135,4 +144,12 @@ defmodule Pleroma.Conversation.Participation do
 
     {:ok, Repo.preload(participation, :recipients, force: true)}
   end
+
+  def unread_conversation_count_for_user(user) do
+    from(p in __MODULE__,
+      where: p.user_id == ^user.id,
+      where: not p.read,
+      select: %{count: count(p.id)}
+    )
+  end
 end
diff --git a/lib/pleroma/user.ex b/lib/pleroma/user.ex
index c2f8fa0d7..494a67f22 100644
--- a/lib/pleroma/user.ex
+++ b/lib/pleroma/user.ex
@@ -11,6 +11,7 @@ defmodule Pleroma.User do
   alias Comeonin.Pbkdf2
   alias Ecto.Multi
   alias Pleroma.Activity
+  alias Pleroma.Conversation.Participation
   alias Pleroma.Delivery
   alias Pleroma.Keys
   alias Pleroma.Notification
@@ -842,6 +843,61 @@ defmodule Pleroma.User do
 
   def maybe_update_following_count(user), do: user
 
+  def set_unread_conversation_count(%User{local: true} = user) do
+    unread_query = Participation.unread_conversation_count_for_user(user)
+
+    User
+    |> where([u], u.id == ^user.id)
+    |> join(:inner, [u], p in subquery(unread_query))
+    |> update([u, p],
+      set: [
+        info:
+          fragment(
+            "jsonb_set(?, '{unread_conversation_count}', ?::varchar::jsonb, true)",
+            u.info,
+            p.count
+          )
+      ]
+    )
+    |> select([u], u)
+    |> Repo.update_all([])
+    |> case do
+      {1, [%{info: %User.Info{}} = user]} -> set_cache(user)
+      _ -> {:error, user}
+    end
+  end
+
+  def set_unread_conversation_count(_), do: :noop
+
+  def increment_unread_conversation_count(conversation, %User{local: true} = user) do
+    unread_query =
+      Participation.unread_conversation_count_for_user(user)
+      |> where([p], p.conversation_id == ^conversation.id)
+
+    User
+    |> join(:inner, [u], p in subquery(unread_query))
+    |> update([u, p],
+      set: [
+        info:
+          fragment(
+            "jsonb_set(?, '{unread_conversation_count}', ((?->>'unread_conversation_count')::int + 1)::varchar::jsonb, true)",
+            u.info,
+            u.info
+          )
+      ]
+    )
+    |> where([u], u.id == ^user.id)
+    |> where([u, p], p.count == 0)
+    |> select([u], u)
+    |> Repo.update_all([])
+    |> case do
+      {1, [%{info: %User.Info{}} = user]} -> set_cache(user)
+      _ -> {:error, user}
+    end
+  end
+
+  def increment_unread_conversation_count(_, _), do: :noop
+
   def remove_duplicated_following(%User{following: following} = user) do
     uniq_following = Enum.uniq(following)
 
diff --git a/lib/pleroma/user/info.ex b/lib/pleroma/user/info.ex
index ebd4ddebf..4b5b43d7f 100644
--- a/lib/pleroma/user/info.ex
+++ b/lib/pleroma/user/info.ex
@@ -47,6 +47,7 @@ defmodule Pleroma.User.Info do
     field(:hide_followers, :boolean, default: false)
     field(:hide_follows, :boolean, default: false)
     field(:hide_favorites, :boolean, default: true)
+    field(:unread_conversation_count, :integer, default: 0)
     field(:pinned_activities, {:array, :string}, default: [])
     field(:email_notifications, :map, default: %{"digest" => false})
     field(:mascot, :map, default: nil)
diff --git a/lib/pleroma/web/mastodon_api/views/account_view.ex b/lib/pleroma/web/mastodon_api/views/account_view.ex
index 99169ef95..2d4976891 100644
--- a/lib/pleroma/web/mastodon_api/views/account_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/account_view.ex
@@ -167,6 +167,7 @@ defmodule Pleroma.Web.MastodonAPI.AccountView do
     |> maybe_put_chat_token(user, opts[:for], opts)
     |> maybe_put_activation_status(user, opts[:for])
     |> maybe_put_follow_requests_count(user, opts[:for])
+    |> maybe_put_unread_conversation_count(user, opts[:for])
   end
 
   defp username_from_nickname(string) when is_binary(string) do
@@ -248,6 +249,16 @@ defmodule Pleroma.Web.MastodonAPI.AccountView do
 
   defp maybe_put_activation_status(data, _, _), do: data
 
+  defp maybe_put_unread_conversation_count(data, %User{id: user_id} = user, %User{id: user_id}) do
+    data
+    |> Kernel.put_in(
+      [:pleroma, :unread_conversation_count],
+      user.info.unread_conversation_count
+    )
+  end
+
+  defp maybe_put_unread_conversation_count(data, _, _), do: data
+
   defp image_url(%{"url" => [%{"href" => href} | _]}), do: href
   defp image_url(_), do: nil
 end