Notify ninjas on their birthday

lib/bokken/accounts.ex

@@ -258,6 +258,12 @@ defmodule Bokken.Accounts do
     |> Repo.all()
   end
 
+  def list_ninjas_preload(args) do
+    Ninja
+    |> Repo.all()
+    |> Repo.preload(args)
+  end
+
   @doc """
   Gets a single ninja.
 

lib/bokken/application.ex

@@ -15,9 +15,11 @@ defmodule Bokken.Application do
       # Start the PubSub system
       {Phoenix.PubSub, name: Bokken.PubSub},
       # Start the Endpoint (http/https)
-      BokkenWeb.Endpoint
+      BokkenWeb.Endpoint,
       # Start a worker by calling: Bokken.Worker.start_link(arg)
       # {Bokken.Worker, arg}
+      Bokken.Periodically
+      # Executes an endpoint periodically
     ]
 
     # See https://hexdocs.pm/elixir/Supervisor.html

lib/bokken/periodically.ex

@@ -0,0 +1,24 @@
+defmodule Bokken.Periodically do
+  use GenServer
+
+  alias BokkenWeb.NinjaController
+
+  def start_link(_opts) do
+    GenServer.start_link(__MODULE__, %{})
+  end
+
+  def init(state) do
+    schedule_work()
+    {:ok, state}
+  end
+
+  def handle_info(:work, state) do
+    NinjaController.notify_ninja_birthday()
+    schedule_work()
+    {:noreply, state}
+  end
+
+  defp schedule_work() do
+    Process.send_after(self(), :work, 24 * 60 * 60 * 1000)
+  end
+end

lib/bokken_web/controllers/ninja_controller.ex

@@ -3,9 +3,11 @@ defmodule BokkenWeb.NinjaController do
 
   alias Bokken.Accounts
   alias Bokken.Accounts.Ninja
+  alias BokkenWeb.EventsEmails
   alias Bokken.Events.Event
   alias Bokken.Events.Lecture
   alias Bokken.Events.TeamNinja
+  alias Bokken.Mailer
 
   action_fallback BokkenWeb.FallbackController
 
@@ -85,4 +87,29 @@ defmodule BokkenWeb.NinjaController do
       send_resp(conn, :no_content, "")
     end
   end
+
+  def notify_ninja_birthday() do
+    ninjas = Accounts.list_ninjas_preload([:user])
+    current_time = DateTime.utc_now()
+    ninjas
+    |> Enum.map(fn ninja -> (ninja.birthday == current_time)
+      send_email(ninja, EventsEmails.ninja_birthday_email(to: ninja.user.email))
+    end)
+  end
+
+  defp send_email(users, email) do
+    [users]
+    |> List.foldl(
+      %{success: [], fail: []},
+      fn user, accumulator ->
+        case Mailer.deliver(email.(user)) do
+          {:ok, _} ->
+            %{success: [user.email | accumulator[:success]], fail: accumulator[:fail]}
+
+          {:error, _} ->
+            %{success: [accumulator[:success]], fail: [user.email | accumulator[:fail]]}
+        end
+      end
+    )
+  end
 end

lib/bokken_web/emails/event_emails.ex

@@ -54,6 +54,14 @@ defmodule BokkenWeb.EventsEmails do
     |> render_body(:mentor_event_reminder)
   end
 
+  def ninja_birthday_email(to: email) do
+    frontend_url = Application.fetch_env!(:bokken, BokkenWeb.Endpoint)[:frontend_url]
+
+    base_email(to: email)
+    |> subject("[CoderDojo Braga] O Dojo deseja-te parabéns!")
+    |> render_body(:ninja_birthday)
+  end
+
   defp base_email(to: email) do
     new()
     |> from({"CoderDojo Braga", "[email protected]"})

lib/bokken_web/router.ex

@@ -100,6 +100,8 @@ defmodule BokkenWeb.Router do
     post "/notify_signup", EventController, :notify_signup
     post "/notify_selected", EventController, :notify_selected
 
+    post "/notify_ninja_birthday", NinjaController, :notify_ninja_birthday
+
     resources "/bot", BotController, except: [:new, :edit]
   end