defmodule Polymarket.Schemas.EventMetadata do
  @moduledoc """
  Internal metadata attached to an `Event` returned by the Gamma API.
  """

  use TypedEctoSchema

  alias Polymarket.JsonUtil
  alias Polymarket.Schemas.Coerce

  @primary_key false

  @derive Jason.Encoder
  typed_embedded_schema do
    field(:context_requires_regen, :boolean)
    field(:context_description, :string)
    field(:context_updated_at, :utc_datetime_usec)
  end

  @doc "Builds an `EventMetadata` 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__{
       context_requires_regen: attrs["context_requires_regen"],
       context_description: attrs["context_description"],
       context_updated_at: Coerce.to_datetime(attrs["context_updated_at"])
     }}
  end
end