defmodule Tesla.Middleware.Opts do
  @moduledoc """
  Set default opts for all requests.

  ## Examples

  ```elixir
  defmodule MyClient do
    def client do
      Tesla.client([
        {Tesla.Middleware.Opts, [some: "option"]}
      ])
    end
  end
  ```
  """

  @behaviour Tesla.Middleware

  @impl Tesla.Middleware
  def call(env, next, opts) do
    adapter =
      env.opts
      |> Keyword.get(:adapter, [])
      |> Keyword.merge(opts[:adapter] || [])

    opts =
      env.opts
      |> Keyword.merge(opts)
      |> Keyword.put(:adapter, adapter)

    Tesla.run(%{env | opts: opts}, next)
  end
end