defmodule NDCLogger do

  def event(provider_label, method, params, request_xml, response_xml) do
    logger_config = Application.get_env(:NDCEx, :logger)
    if !is_nil(logger_config) && (logger_config[:methods] == :all || Enum.member?(logger_config[:methods], method)) do
      log_to_output(provider_label, params, request_xml, response_xml, logger_config)
    end
  end
  defp log_to_output(provider_label, params, request_xml, response_xml, logger_config) do

    {file, content} = openFile(provider_label)

    {{year, mon, day}, {hh, mm, ss}} = :os.timestamp |> :calendar.now_to_datetime
    datetime = "#{year}/#{mon}/#{day} #{hh}:#{mm}:#{ss}"

    writeInFile(file, content, "")

    if Enum.member?([:both, :console], logger_config[:params]), do: IO.inspect params
    if Enum.member?([:both, :file], logger_config[:params]), do: writeInFile(file, params, "\nPARAMS #{datetime}\n")

    if Enum.member?([:both, :console], logger_config[:request]), do: IO.puts request_xml
    if Enum.member?([:both, :file], logger_config[:request]), do: writeInFile(file, request_xml, "\n\nREQUEST #{datetime}\n")

    if Enum.member?([:both, :console], logger_config[:response]), do: IO.inspect response_xml
    if Enum.member?([:both, :file], logger_config[:response]), do: writeInFile(file, response_xml, "\n\nRESPONSE #{datetime}\n")

    File.close file
  end
  defp openFile(provider_label) do
    filename = "logs/#{provider_label}.log"
    content = if File.exists?(filename), do: filename |> File.read!, else: ""
    case File.open filename, [:write] do
      {:ok, file} -> {file, content}
      {:error, reason} ->
        IO.inspect reason
        {nil, content}
    end
  end
  defp writeInFile(file, data, type) do
    if(file !== nil) do
      IO.binwrite(file, type)
      IO.binwrite(file, data)
    end
  end
end