Add checking and updating DeepL usage information

lib/outlook/translators.ex

@@ -16,12 +16,10 @@ defmodule Outlook.Translators do
 
   def get_deepl_account!(id), do: Repo.get!(DeeplAccount, id)
 
-  def get_deepl_auth_key(user_id) do
-    query =
-      from DeeplAccount,
-        where: [user_id: ^user_id],
-        select: [:auth_key]
-    Repo.one!(query)
+  def get_deepl_auth_key(user) do
+    deepl_account_for_user(user)
+    |> select([:auth_key])
+    |> Repo.one()
     |> Map.get(:auth_key)
   end
 
@@ -45,6 +43,10 @@ defmodule Outlook.Translators do
     DeeplAccount.changeset(deepl_account, attrs)
   end
 
+  def increase_our_character_count(user, billed_characters) do
+    deepl_account_for_user(user)
+    |> Repo.update_all([inc: [our_character_count: billed_characters]])
+  end
 
   def translate(translation, current_user) do
     %{lang: target_lang,
@@ -64,6 +66,11 @@ defmodule Outlook.Translators do
     Task.start_link(Deepl, :translate, args)
   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)
+  end
+
   defp prepare_article(tree) do
     # Logger.info "so far."
     HtmlDocComponent.render_doc(%{tree: tree})

lib/outlook/translators/deepl.ex

@@ -10,6 +10,12 @@ defmodule Outlook.Translators.Deepl do
     send(pid, {:progress, %{progress: nil}})
   end
 
+  def get_usage_counts(auth_key) do
+    response = HTTPoison.get!("https://api-free.deepl.com/v2/usage",
+      ["Authorization": "DeepL-Auth-Key #{auth_key}"])
+    Jason.decode!(response.body, keys: :atoms)
+  end
+
   # @options [ssl: [{:versions, [:'tlsv1.2']}], recv_timeout: 500]
 
   @doc """

lib/outlook/translators/deepl_account.ex

@@ -18,6 +18,6 @@ defmodule Outlook.Translators.DeeplAccount do
   def changeset(deepl_account, attrs) do
     deepl_account
     |> cast(attrs, [:name, :description, :auth_key, :character_limit, :character_count, :our_character_count, :user_id])
-    |> validate_required([:name, :description, :auth_key, :character_limit, :user_id])
+    |> validate_required([:name, :description, :auth_key, :user_id])
   end
 end

lib/outlook_web/live/translation_live/form_component.ex

@@ -68,7 +68,7 @@ defmodule OutlookWeb.TranslationLive.FormComponent do
 
   def update(%{deepl_translation: translation}, socket) do
     tunit_keys = Map.keys(socket.assigns.translation_content)
-    case Outlook.Translators.process_translation_result(translation, tunit_keys) do
+    case Outlook.Translators.process_translation_result(translation, tunit_keys, socket.assigns.current_user) do
       {:ok, new_translation_content} ->
         {:ok, socket
           |> assign(translation_content: new_translation_content)