Send opponent an email if they're offline

lib/chess/emails.ex

@@ -2,6 +2,10 @@ defmodule Chess.Emails do
   @moduledoc false
 
   import Bamboo.Email
+  import ChessWeb.GameView, only: [opponent: 2]
+
+  alias Chess.Repo
+  alias Chess.Store.User
 
   def new_game_email(conn, game) do
     new_email()
@@ -14,4 +18,19 @@ defmodule Chess.Emails do
       Game link: #{ChessWeb.Router.Helpers.game_url(conn, :show, game)}
     """)
   end
+
+  def opponent_moved_email(socket, game) do
+    user = Repo.get(User, socket.assigns.user_id)
+    opponent = opponent(game, socket.assigns.user_id)
+
+    new_email()
+    |> to(opponent)
+    |> from({"64squares", "games@64squares.club"})
+    |> subject(
+      "[64squares] #{user.name} has moved."
+    )
+    |> text_body("""
+      Game link: #{ChessWeb.Router.Helpers.game_url(socket, :show, game)}
+    """)
+  end
 end

lib/chess_web/channels/game_channel.ex

@@ -6,6 +6,8 @@ defmodule ChessWeb.GameChannel do
   import ChessWeb.GameView, only: [player: 2, opponent: 2]
 
   alias Chess.Board
+  alias Chess.Emails
+  alias Chess.Mailer
   alias Chess.MoveList
   alias Chess.Moves
   alias Chess.Repo.Queries
@@ -42,14 +44,17 @@ defmodule ChessWeb.GameChannel do
   end
 
   def handle_in("game:move", params, socket) do
+    game =
+      socket.assigns.user_id
+      |> Queries.game_for_info(socket.assigns.game_id)
+
     move_params = convert_params(params)
 
-    socket.assigns.user_id
-    |> Queries.game_with_moves(socket.assigns.game_id)
+    game
     |> Moves.make_move(move_params)
     |> case do
       {:ok, _} ->
-        send_update(socket)
+        update_opponent(socket, game)
 
         {:noreply, socket}
       {:error, :game, changeset, _} ->
@@ -80,6 +85,24 @@ defmodule ChessWeb.GameChannel do
     {:reply, {:ok, reply}, socket}
   end
 
+  def update_opponent(socket, game) do
+    opponent_id =
+      opponent(game, socket.assigns.user_id).id
+      |> Integer.to_string
+
+    "game:#{game.id}"
+    |> Presence.list
+    |> case do
+      %{^opponent_id => _} ->
+        send_update(socket)
+      _ ->
+        send_update(socket)
+        socket
+        |> Emails.opponent_moved_email(game)
+        |> Mailer.deliver_later
+    end
+  end
+
   def track_presence(socket) do
     {:ok, _} = Presence.track(socket, socket.assigns.user_id, %{
       user_id: socket.assigns.user_id,

lib/chess_web/channels/user_socket.ex

@@ -29,7 +29,7 @@ defmodule ChessWeb.UserSocket do
         :error
     end
   end
-  def connect(%{}, socket), do: :error
+  def connect(%{}, _socket), do: :error
 
   # Socket id's are topics that allow you to identify all sockets for a given user:
   #

lib/chess_web/controllers/game_controller.ex

@@ -1,9 +1,10 @@
 defmodule ChessWeb.GameController do
   use ChessWeb, :controller
 
+  alias Chess.Emails
+  alias Chess.Mailer
   alias Chess.Store.Game
   alias Chess.Store.User
-  alias Chess.Mailer
 
   import Chess.Auth, only: [current_user: 1]
 
@@ -42,7 +43,7 @@ defmodule ChessWeb.GameController do
     |> case do
       {:ok, game} ->
         conn
-        |> Chess.Emails.new_game_email(
+        |> Emails.new_game_email(
           game
           |> Repo.preload(:user)
           |> Repo.preload(:opponent)

test/chess/store/move_test.exs

@@ -10,7 +10,6 @@ defmodule Chess.Store.MoveTest do
   alias Chess.Store.Move
 
   describe "move" do
-
     test "move is valid with a game, a from, and a to" do
       user = insert(:user, %{email: "link@hyrule.com"})
       opponent = insert(:user, %{email: "zelda@hyrule.com"})

test/features/moves_test.exs

@@ -1,5 +1,6 @@
 defmodule Chess.Features.MovesTest do
   use ChessWeb.FeatureCase
+  use Bamboo.Test, shared: true
 
   import Wallaby.Query
 
@@ -31,6 +32,37 @@ defmodule Chess.Features.MovesTest do
     |> refute_has(square_containing("f4-r1", "white.pawn"))
   end
 
+  test "opponents recieves an email on move", %{session: session} do
+    user = insert(:user, %{
+      name: "Link",
+      email: "link@hyrule.com",
+      password: "ilovezelda"
+    })
+    opponent = insert(:user, %{
+      name: "Zelda",
+      email: "zelda@hyrule.com",
+      password: "ganonsucks"
+    })
+
+    session
+    |> login("link@hyrule.com", "ilovezelda")
+    |> visit("/games")
+    |> click(link("New game"))
+    |> select("game[opponent_id]", option: "Zelda")
+    |> click(button("Create game"))
+
+    assert_email_delivered_with(to: [{opponent.name, opponent.email}])
+
+    session
+    |> click(css("#f4-r1"))
+    |> click(css("#f4-r3"))
+
+    assert_email_delivered_with(
+      to: [{opponent.name, opponent.email}],
+      subject: "[64squares] #{user.name} has moved."
+    )
+  end
+
   test "cannot move the opponents pieces", %{session: session} do
     insert(:user, %{
       name: "Zelda",