defmodule Flagsmith.SDK.Client do
  use TypedEctoSchema
  alias Flagsmith.SDK

  import Ecto.Changeset,
    only: [
      cast: 3,
      apply_action: 2,
      validate_required: 2
    ]

  @default_url "https://api.flagsmith.com/api/v1"
  @auth_header "X-Environment-Key"
  @primary_key false

  typed_embedded_schema do
    field(:environment_key, SDK.MaybeFunction)
    field(:base_url, SDK.MaybeFunction, default_value: @default_url)
  end

  @spec default_url() :: String.t()
  def default_url(), do: @default_url

  @spec new(SDK.Types.environment_key(), SDK.Types.base_url()) :: SDK.Client.t()
  def new(environment_key, base_url) do
    %__MODULE__{}
    |> cast(%{environment_key: environment_key, base_url: base_url}, [:environment_key, :base_url])
    |> validate_required([:environment_key, :base_url])
    |> apply_action(:insert)
  end

  def auth_middleware(environment_key) when is_binary(environment_key),
    do: {Tesla.Middleware.Headers, auth_header(environment_key)}

  def base_url_middleware(base_url) when is_binary(base_url),
    do: {Tesla.Middleware.BaseUrl, base_url}

  defp auth_header(environment_key), do: [{@auth_header, environment_key}]
end