defmodule Polymarket.Schemas.NewMarketEvent do
  @moduledoc """
  New market event. Announces a freshly created market on the websocket feed.
  """

  use TypedEctoSchema

  alias Polymarket.JsonUtil
  alias Polymarket.Schemas.Coerce
  alias Polymarket.Schemas.EventMessage
  alias Polymarket.Schemas.FeeSchedule

  @primary_key false

  @derive Jason.Encoder
  typed_embedded_schema do
    field(:id, :string)
    field(:active, :boolean)
    field(:line, :string)
    field(:description, :string)
    field(:question, :string)
    field(:market, :string)
    field(:condition_id, :string)
    field(:slug, :string)
    # Assumed to be an array of tag strings; only seen empty so far.
    field(:tags, {:array, :string})
    field(:clob_token_ids, {:array, :string})
    field(:assets_ids, {:array, :string})
    field(:outcomes, {:array, :string})
    field(:taker_base_fee, :integer)
    field(:order_price_min_tick_size, :float)
    field(:fees_enabled, :boolean)
    field(:group_item_title, :string)
    # Empty string in samples; kept as a string since the populated format is
    # unknown (Gamma models the equivalent field as a datetime).
    field(:game_start_time, :string)
    field(:sports_market_type, :string)
    # Unix epoch in milliseconds, delivered as a string (e.g. "1779660930454").
    field(:timestamp, :integer)
    field(:event_type, :string)

    embeds_one(:fee_schedule, FeeSchedule)
    embeds_one(:event_message, EventMessage)
  end

  @required [:id, :market, :condition_id, :timestamp, :event_type]

  @doc """
  Builds a `NewMarketEvent` from a decoded (atom-keyed) websocket message,
  coercing each value to its field type. Returns
  `{:error, {:missing_fields, fields}}` when a required field is absent.
  """
  @spec from_attrs(map()) :: {:ok, t()} | {:error, {:missing_fields, [atom()]}}
  def from_attrs(attrs) do
    attrs = JsonUtil.snake_case_keys(attrs)

    %__MODULE__{
      id: attrs["id"],
      active: attrs["active"],
      line: attrs["line"],
      description: attrs["description"],
      question: attrs["question"],
      market: attrs["market"],
      condition_id: attrs["condition_id"],
      slug: attrs["slug"],
      tags: attrs["tags"],
      clob_token_ids: attrs["clob_token_ids"],
      assets_ids: attrs["assets_ids"],
      outcomes: attrs["outcomes"],
      taker_base_fee: Coerce.to_int(attrs["taker_base_fee"]),
      order_price_min_tick_size: Coerce.to_float(attrs["order_price_min_tick_size"]),
      fees_enabled: attrs["fees_enabled"],
      group_item_title: attrs["group_item_title"],
      game_start_time: attrs["game_start_time"],
      sports_market_type: attrs["sports_market_type"],
      timestamp: Coerce.to_int(attrs["timestamp"]),
      event_type: attrs["event_type"],
      fee_schedule: Coerce.embed(FeeSchedule, attrs["fee_schedule"]),
      event_message: Coerce.embed(EventMessage, attrs["event_message"])
    }
    |> Coerce.require_fields(@required)
  end
end