from abc import ABC, abstractmethod

from internal_types.types import OHLC, BidAsk, Instrument, Position


# todo:
#   handle strategy that trades multiple instruments
#   fractional position/volume for crypto
#   callback for async order
#
#   def instruments_to_trade
#   def 'stuff' to stream (stock price, vix, ...)
class Strategy(ABC):

  @abstractmethod
  def unfilled_positions(self, instr: Instrument) -> Position:
    pass

  @abstractmethod
  def order_filled(self, new_pos: Position):
    pass

  @abstractmethod
  def process_bid_ask(self, bid_ask: BidAsk):
    pass

  @abstractmethod
  def process_ohlc(self, ohlc: OHLC):
    pass

  @abstractmethod
  def net_liquid_value(self, at_price: float) -> float:
    pass