Add basic functions for keeping track of Deepl account usage

lib/outlook/translators.ex

@@ -48,6 +48,19 @@ defmodule Outlook.Translators do
     |> Repo.update_all([inc: [our_character_count: billed_characters]])
   end
 
+  def get_uptodate_deepl_counts(user) do
+    deepl_counts = Deepl.get_usage_counts(get_deepl_auth_key(user))
+    our_character_count = deepl_account_for_user(user)
+    |> select([:our_character_count])
+    |> Repo.one()
+    |> Map.get(:our_character_count)
+    most_accurate = max(our_character_count, deepl_counts.character_count)
+    %{character_limit: deepl_counts.character_limit,
+      character_count: deepl_counts.character_count,
+      our_character_count: our_character_count,
+      percent_used: most_accurate * 100 / deepl_counts.character_limit}
+  end
+
   def translate(translation, current_user) do
     %{language: target_lang,
       article: %{content: article_tree, language: source_lang}
@@ -71,6 +84,14 @@ defmodule Outlook.Translators do
     process_translation(result.translation, tunit_ids)
   end
 
+  def update_deepl_counts(user, counts) do
+    deepl_account_for_user(user)
+    |> Repo.update_all([set: [
+      character_limit: counts.character_limit,
+      character_count: counts.character_count
+    ]])
+  end
+
   defp deepl_account_for_user(user) when is_struct(user), do: deepl_account_for_user(user.id)
   defp deepl_account_for_user(user_id) do
     DeeplAccount |> where(user_id: ^user_id)