defmodule BlogPhoenix.Context do
  @moduledoc """
  This module is just a regular plug that can look at the conn struct and build
  the appropriate absinthe context.
  """

  @behaviour Plug
  import Plug.Conn

  def init(opts), do: opts

  def call(conn, _) do
    case get_token(conn) do
      {:ok, claims} ->
        context = build_context(claims)
        IO.inspect [context: context]
        put_private(conn, :absinthe, %{context: context})
      {:error, reason} ->
        conn
        |> put_resp_content_type("application/json")
        |> send_resp(403, Poison.encode!(%{error: reason}))
        |> halt
    end
  end

  defp get_token(conn) do
    with ["Bearer " <> token] <- get_req_header(conn, "authorization"),
    {:ok, claims} <- BlogPhoenix.Guardian.decode_and_verify(token)
    do
      {:ok, claims}
    else
      _ -> {:error, "unauthorized"}
    end
  end

  defp build_context(claims) do
    with user <- Map.get(claims, "name") do
      %{current_user: user}
    else
      _ -> %{}
    end
  end

  defp get_user(data) do
    IO.inspect(data)
    BlogPhoenix.Repo.get_by(BlogPhoenix.User, id: id)
  end

end