# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.HTTP.AdapterHelper.Gun do
  @behaviour Pleroma.HTTP.AdapterHelper

  alias Pleroma.Gun.ConnectionPool
  alias Pleroma.HTTP.AdapterHelper

  require Logger

  @defaults [
    connect_timeout: 5_000,
    domain_lookup_timeout: 5_000,
    tls_handshake_timeout: 5_000,
    retry: 1,
    retry_timeout: 1000,
    await_up_timeout: 5_000
  ]

  @spec options(keyword(), URI.t()) :: keyword()
  def options(incoming_opts \\ [], %URI{} = uri) do
    proxy =
      Pleroma.Config.get([:http, :proxy_url])
      |> AdapterHelper.format_proxy()

    config_opts = Pleroma.Config.get([:http, :adapter], [])

    @defaults
    |> Keyword.merge(config_opts)
    |> add_scheme_opts(uri)
    |> AdapterHelper.maybe_add_proxy(proxy)
    |> Keyword.merge(incoming_opts)
  end

  @spec after_request(keyword()) :: :ok
  def after_request(opts) do
    if opts[:conn] && opts[:body_as] != :chunks do
      ConnectionPool.release_conn(opts[:conn])
    end

    :ok
  end

  defp add_scheme_opts(opts, %{scheme: "http"}), do: opts

  defp add_scheme_opts(opts, %{scheme: "https"}) do
    opts
    |> Keyword.put(:certificates_verification, true)
    |> Keyword.put(:tls_opts, log_level: :warning)
  end

  @spec get_conn(URI.t(), keyword()) :: {:ok, keyword()} | {:error, atom()}
  def get_conn(uri, opts) do
    case ConnectionPool.get_conn(uri, opts) do
      {:ok, conn_pid} -> {:ok, Keyword.merge(opts, conn: conn_pid, close_conn: false)}
      err -> err
    end
  end
end