import logging
from typing import Optional, Any
from core.schema import StandardMessage, StandardResponse
from core.events.event_bus import bus

logger = logging.getLogger("cs_agent")

class BusinessEngine:
    """
    业务逻辑中枢（备用引擎，主流程由 Orchestrator + Brain 处理）。
    仅在 Orchestrator 不可用时作为降级方案。
    """
    def __init__(self, agent_instance: Any = None):
        self.agent = agent_instance

    async def handle_message(self, msg: StandardMessage) -> StandardResponse:
        content = (msg.content or "")
        logger.info(f"[Engine] 收到来自 {msg.platform} 的消息: {msg.user_id} -> {content[:50]}")

        return StandardResponse(
            reply_content="稍等哈，设计师马上来。",
            metadata={"acc_id": msg.acc_id, "acc_type": msg.acc_type}
        )

    async def emit_image_result(self, user_id: str, platform: str, url: str, acc_id: str):
        """
        这是一个业务触发器示例：当图片处理完成时，由 Engine 主动发广播。
        """
        await bus.emit(
            "MESSAGE_OUTBOUND",
            user_id=user_id,
            platform=platform,
            response=StandardResponse(
                reply_content=url,
                msg_type=1, # 图片
                metadata={"acc_id": acc_id}
            )
        )