ex_wechat

defmodule ExWechat.Helpers.ApiHelper do
  @moduledoc """
    praser data from api description file.
  """
  use ExWechat.Base
  import ExWechat.Helpers.ApiParser

  @api_path Path.join(__DIR__, "../apis")

  def process_api_definition_data(needed)
  def process_api_definition_data(nil),     do: process_api_definition_data(:all)
  def process_api_definition_data(:all),    do: all_api_definition_data
  def process_api_definition_data(needed),  do: Map.take(all_api_definition_data, needed)

  defp all_definition_files, do: _all_definition_files(api_definition_files)
  defp _all_definition_files(user_define_path)
  defp _all_definition_files(nil), do: all_files_in_folder(@api_path)
  defp _all_definition_files(user_define_path), do: all_files_in_folder(@api_path) ++ all_files_in_folder(user_define_path)

  defp all_files_in_folder(path) do
    Path.wildcard(path <> "/*")
  end

  # get all the data of all the api definition file
  defp all_api_definition_data, do: _all_definition_data(all_definition_files)
  defp _all_definition_data(files, result \\ %{})
  defp _all_definition_data([], result) do
    # IO.inspect result
    result
  end
  defp _all_definition_data([file | tail], result) do
    key = get_key_from_path(file)
    data = Map.put(result, key,
              Map.get(result, key, []) ++ (file |> api_definition_data))
    _all_definition_data(tail, data)
  end

  defp get_key_from_path(path), do: path |> String.split("/") |> List.last |> String.to_atom

  defp api_definition_data(path) do
    File.stream!(path, [], :line)
    |> Stream.map(&String.trim/1)
    |> Stream.reject(&(String.length(&1) == 0))
    |> Enum.to_list
    |> do_parse_api_data
  end
end