defmodule UPYun.Util do

  def request(method, url, headers, body \\ nil) when body == nil or is_map(body) do
    default_headers = %{
      'accept' => 'application/vnd.hex.beta+elixir',
      'accept-encoding' => 'gzip',
      'user-agent' => user_agent()}
    headers = Dict.merge(default_headers, headers)

    http_opts = [ssl: ssl_opts(url), relaxed: true]
    opts = [body_format: :binary]
    url = String.to_char_list(url)

    cond do
      body ->
        request = {url, Map.to_list(headers), 'application/vnd.hex+elixir', body}
      method in [:put, :post] ->
        request = {url, Map.to_list(headers), 'application/vnd.hex+elixir', '%{}'}
      true ->
        request = {url, Map.to_list(headers)}
    end

    case :httpc.request(method, request, http_opts, opts, :hex) do
      {:ok, response} ->
        handle_response(response)
      {:error, reason} ->
        {:http_error, reason}
    end
  end
end