from __future__ import annotations
import time
from typing import List
from ..dsl import LocalEvent, PlanDelta

class FixFeedSimulator:
  """
  Lightweight FIX feed simulator that emits LocalEvent and PlanDelta samples.
  This is intentionally simplistic and deterministic for MVP replay demos.
  """
  def __init__(self, seed: int = 1):
    self.seed = seed

  def generate_stream(self) -> List[object]:
    t = time.time()
    # Create a LocalEvent tick followed by a PlanDelta
    md1 = LocalEvent(
      event_id="md1",
      event_type="MDTick",
      asset="ABC",
      venue="FIX_GATEWAY",
      timestamp=t,
      payload={"price": 101.5, "size": 100},
    )
    plan = PlanDelta(
      delta_id="d1",
      timestamp=t + 0.01,
      author="sim",
      contract_id="ABC",
      delta_payload={"action": "BUY", "qty": 10, "limit": 102.0},
      signature="sig",
    )
    return [md1, plan]