"""游客对话接口：免认证 /api/chat/visitor。"""

from __future__ import annotations

import uuid
from typing import Annotated

from fastapi import APIRouter, Depends, Request

from app.gateway.visitor_deps import get_visitor_context
from app.model.schemas import AuthContext, VisitorChatRequest, VisitorChatResponseData
from app.repository.audit_repository import AuditRepository
from app.service.visitor_service import run_visitor_chat
from app.utils.input_guard import validate_user_message
from app.utils.response import ok

router = APIRouter(prefix="/api", tags=["visitor"])


@router.post("/chat/visitor")
def visitor_chat(
    body: VisitorChatRequest,
    request: Request,
    ctx: Annotated[AuthContext, Depends(get_visitor_context)],
):
    """游客对话：免认证，不查客户数据，不写 agent_session/agent_message。"""
    message = validate_user_message(body.message)
    session_id = body.session_id or str(uuid.uuid4())

    reply, has_disclaimer, intent, transfer = run_visitor_chat(ctx, message, session_id)

    # 审计落库（agent_type=platform，ENUM 已含）；审计失败不阻断对话主流程
    try:
        AuditRepository().insert(
            trace_id=ctx.trace_id,
            event_type="visitor_chat_completed",
            agent_type="platform",
            actor_id="visitor",
            input_summary={
                "session_id": session_id,
                "intent": intent,
                "transfer": transfer,
                "msg_len": len(message),
            },
            decision="transfer_human" if transfer else "success",
        )
    except Exception:
        pass

    data = VisitorChatResponseData(
        session_id=session_id,
        reply=reply,
        intent=intent,
        has_disclaimer=has_disclaimer,
        transfer_to_human=transfer,
    )
    return ok(data.model_dump(), ctx.trace_id)