from __future__ import annotations

import json
from typing import Dict, Any, List

from .trace import LocalEvent, PlanDelta, OrderEvent, FillEvent


class FixFeedAdapter:
    """Starter FIX feed adapter (simulation).

    Emits LocalEvent instances as JSON over an in-process queue for now.
    """

    def __init__(self) -> None:
        self._outbox: List[str] = []

    def emit(self, event: LocalEvent) -> None:
        self._outbox.append(json.dumps(event.to_dict()))

    def drain(self) -> List[str]:
        out, self._outbox = self._outbox, []
        return out


class ExchangeGatewaySandbox:
    """Starter exchange gateway sandbox (simulation).

    Consumes JSON messages and returns a parsed dict representation.
    """

    def __init__(self) -> None:
        self._inbox: List[str] = []

    def receive(self, payload: str) -> None:
        self._inbox.append(payload)

    def parse_all(self) -> List[Dict[str, Any]]:
        messages = [json.loads(p) for p in self._inbox]
        self._inbox.clear()
        return messages