chess/lib/chess_web/controllers/session_controller.ex

defmodule ChessWeb.SessionController do
  use ChessWeb, :controller

  alias Chess.Auth
  alias Chess.Auth.Guardian
  alias Chess.Store.User

  def new(conn, _params) do
    changeset = User.changeset(%User{})
    render(conn, "new.html", changeset: changeset)
  end

  def create(
        conn,
        %{"user" => %{"email" => email, "password" => password}}
      ) do
    case Auth.authenticate_user(email, password) do
      {:ok, user} ->
        conn
        |> Guardian.Plug.sign_in(user)
        |> put_flash(:info, "You are logged in")
        |> redirect(to: game_path(conn, :index))

      {:error, _error} ->
        changeset = User.changeset(%User{})

        conn
        |> put_flash(:error, "Bad email or password")
        |> render("new.html", changeset: changeset)
    end
  end

  def delete(conn, _params) do
    conn
    |> Guardian.Plug.sign_out()
    |> put_flash(:info, "You are logged out")
    |> redirect(to: page_path(conn, :index))
  end
end