"""
@event Event Publisher (Backend/app/events/publisher.py)
@purpose Event Bus publisher for broadcasting domain events across Commerce, Repair, and Core services.
"""
from typing import Dict, Any, List, Callable
import logging

logger = logging.getLogger("EventBus")

_SUBSCRIBERS: Dict[str, List[Callable[[Dict[str, Any]], None]]] = {}

def subscribe(event_type: str, handler: Callable[[Dict[str, Any]], None]):
    if event_type not in _SUBSCRIBERS:
        _SUBSCRIBERS[event_type] = []
    _SUBSCRIBERS[event_type].append(handler)
    logger.info(f"Subscribed handler for event: {event_type}")

def publish_event(event_type: str, payload: Dict[str, Any]):
    logger.info(f"Publishing event [{event_type}] with payload keys: {list(payload.keys())}")
    handlers = _SUBSCRIBERS.get(event_type, [])
    for handler in handlers:
        try:
            handler(payload)
        except Exception as e:
            logger.error(f"Error handling event [{event_type}]: {e}")