defmodule Polymarket.Schemas.FeeSchedule do
  @moduledoc """
  Fee schedule for a market. Part of a NewMarketEvent.
  """

  use TypedEctoSchema

  alias Polymarket.JsonUtil
  alias Polymarket.Schemas.Coerce

  @primary_key false

  @derive Jason.Encoder
  typed_embedded_schema do
    field(:exponent, :float)
    field(:rate, :float)
    field(:rebate_rate, :float)
    field(:taker_only, :boolean)
  end

  @doc "Builds a `FeeSchedule` from a decoded (JSON) map, coercing each field."
  @spec from_attrs(map()) :: {:ok, t()}
  def from_attrs(attrs) do
    attrs = JsonUtil.snake_case_keys(attrs)

    {:ok,
     %__MODULE__{
       exponent: Coerce.to_float(attrs["exponent"]),
       rate: Coerce.to_float(attrs["rate"]),
       rebate_rate: Coerce.to_float(attrs["rebate_rate"]),
       taker_only: attrs["taker_only"]
     }}
  end
end