defmodule ComfycampWeb.OauthController do
  use ComfycampWeb, :controller

  alias Comfycamp.SSO
  alias Comfycamp.SSO.OIDCApp

  def confirm(conn, %{"client_id" => client_id, "response_type" => "code"} = params) do
    app = %OIDCApp{enabled: true} = SSO.get_oidc_app!(client_id)

    render(conn, :confirm,
      page_title: "Подтвердите вход",
      app_name: app.name,
      params: URI.encode_query(params)
    )
  end

  def generate_code(conn, %{"client_id" => client_id, "redirect_uri" => redirect_uri} = params) do
    %OIDCApp{enabled: true} = SSO.get_oidc_app!(client_id)

    uri = build_redirect_uri(redirect_uri, "test_code", params["state"])
    redirect(conn, external: uri)
  end

  defp build_redirect_uri(redirect_uri, code, state) do
    parsed_uri = URI.parse(redirect_uri)

    query =
      build_query_params(code, state)
      |> URI.encode_query()

    %{parsed_uri | query: query}
    |> URI.to_string()
  end

  defp build_query_params(code, state) do
    params = %{"code" => code}

    if state do
      Map.put(params, "state", state)
    else
      params
    end
  end
end