Add Push notifications backend support

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

lib/service/notifier/email.ex

@@ -3,10 +3,10 @@ defmodule Mobilizon.Service.Notifier.Email do
   Email notifier
   """
   alias Mobilizon.Activities.Activity
-  alias Mobilizon.Config
+  alias Mobilizon.{Config, Users}
   alias Mobilizon.Service.Notifier
   alias Mobilizon.Service.Notifier.Email
-  alias Mobilizon.Users.User
+  alias Mobilizon.Users.{NotificationPendingNotificationDelay, Setting, User}
   alias Mobilizon.Web.Email.Activity, as: EmailActivity
   alias Mobilizon.Web.Email.Mailer
 
@@ -18,14 +18,61 @@ defmodule Mobilizon.Service.Notifier.Email do
   end
 
   @impl Notifier
-  def send(%User{} = user, %Activity{} = activity) do
-    Email.send(user, [activity])
+  def send(%User{} = user, %Activity{} = activity, options) do
+    Email.send(user, [activity], options)
   end
 
   @impl Notifier
-  def send(%User{email: email, locale: locale}, activities) when is_list(activities) do
-    email
-    |> EmailActivity.direct_activity(activities, locale)
-    |> Mailer.send_email()
+  def send(%User{email: email, locale: locale} = user, activities, options)
+      when is_list(activities) do
+    if can_send?(user) do
+      email
+      |> EmailActivity.direct_activity(activities, Keyword.put(options, :locale, locale))
+      |> Mailer.send_email()
+
+      save_last_notification_time(user)
+      {:ok, :sent}
+    else
+      {:ok, :skipped}
+    end
+  end
+
+  @type notification_type ::
+          :group_notifications
+          | :notification_pending_participation
+          | :notification_pending_membership
+
+  @spec user_notification_delay(User.t(), notification_type()) ::
+          NotificationPendingNotificationDelay.t()
+  defp user_notification_delay(%User{} = user, type \\ :group_notifications) do
+    Map.from_struct(user.settings)[type]
+  end
+
+  @spec can_send?(User.t()) :: boolean()
+  defp can_send?(%User{settings: %Setting{last_notification_sent: last_notification_sent}} = user) do
+    last_notification_sent_or_default = last_notification_sent || DateTime.utc_now()
+    notification_delay = user_notification_delay(user)
+    diff = DateTime.diff(DateTime.utc_now(), last_notification_sent_or_default)
+
+    cond do
+      notification_delay == :none -> false
+      is_nil(last_notification_sent) -> true
+      notification_delay == :direct -> true
+      notification_delay == :one_hour -> diff >= 60 * 60
+      notification_delay == :one_day -> diff >= 24 * 60 * 60
+    end
+  end
+
+  @spec save_last_notification_time(User.t()) :: {:ok, Setting.t()} | {:error, Ecto.Changeset.t()}
+  defp save_last_notification_time(%User{id: user_id}) do
+    attrs = %{user_id: user_id, last_notification_sent: DateTime.utc_now()}
+
+    case Users.get_setting(user_id) do
+      nil ->
+        Users.create_setting(attrs)
+
+      %Setting{} = setting ->
+        Users.update_setting(setting, attrs)
+    end
   end
 end