defmodule ExWechat.Template do
  @moduledoc """
    Template APIs
  """


  alias ExWechat.Util




  @doc """
    fetch all private templates
  """
  def query do
    "https://api.weixin.qq.com/cgi-bin/template/get_all_private_template?access_token=#{ExWechat.token}"
      |> HTTPoison.get
      |> Util.parse_resp
      |> Util.check_wechat_resp
  end


  @doc """
    send template message
  """
  def send(uid, template, message, url \\ nil) do
    data = message
            |> Enum.reduce(%{}, fn({k,v}, acc) ->
                  acc |> Map.put(k, %{value: v})
               end)

    content = do_make_content url,
                %{
                  touser: uid,
                  template_id: template,
                  data: data
                }


    "https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=#{ExWechat.token}"
      |> HTTPoison.post(Poison.encode!(content))
      |> Util.parse_resp
      |> Util.check_wechat_resp
  end



  defp do_make_content(nil, content), do: content
  defp do_make_content(url, content), do: content |> Map.put(:url, url)
end