"""Pub/sub messaging bus for chat events over Redis.

Provides asynchronous publish hooks for world/room chat and DMs, allowing the
WebSocket real-time gateway (and multi-instance replicas) to receive and fan out
chat messages in real time.
"""

from __future__ import annotations

import json
import logging
from typing import Any

import redis.asyncio as aioredis

from app.config import settings

logger = logging.getLogger(__name__)


async def publish_world_chat_event(
    world_id: int, payload: dict[str, Any], room_id: int | None = None
) -> None:
    """Publish a world chat message event to Redis pub/sub for real-time delivery."""
    try:
        client = aioredis.from_url(settings.REDIS_URL, encoding="utf-8", decode_responses=True)
        async with client:
            channel = f"world:{world_id}:chat"
            data = json.dumps(payload, default=str)
            await client.publish(channel, data)
            if room_id is not None:
                await client.publish(f"room:{room_id}:chat", data)
    except Exception as exc:
        logger.debug("Failed to publish world chat event to Redis: %s", exc)


async def publish_dm_chat_event(
    conversation_id: int, payload: dict[str, Any]
) -> None:
    """Publish a DM chat message event to Redis pub/sub for real-time delivery."""
    try:
        client = aioredis.from_url(settings.REDIS_URL, encoding="utf-8", decode_responses=True)
        async with client:
            channel = f"dm:{conversation_id}:chat"
            data = json.dumps(payload, default=str)
            await client.publish(channel, data)
    except Exception as exc:
        logger.debug("Failed to publish DM chat event to Redis: %s", exc)