life-echo/api/app/agents/chat/orchestrator.py

"""
ChatOrchestrator：AI 回复用户模块的编排层
负责路由（Profile vs Interview）、调用 Specialist Agent；持久化由 feature 层 ConversationHistoryStore 完成。
"""

import time
from datetime import datetime
from typing import TYPE_CHECKING, List, Optional

from sqlalchemy.ext.asyncio import AsyncSession

from app.agents.chat.agent_turn import AgentChatTurn
from app.agents.chat.interview_agent import InterviewAgent
from app.agents.chat.profile_agent import ProfileAgent
from app.agents.state_schema import MemoirStateSchema
from app.core.agent_logging import agent_summary_enabled, log_agent_detail
from app.core.logging import get_logger
from app.agents.chat.stage_detection import (
    detect_primary_life_stage,
    life_stage_display_name,
)
from app.core.config import settings
from app.core.dependencies import get_llm_provider
from app.features.conversation.input_normalize import normalize_chat_input_for_agent
from app.features.memoir.state_service import get_or_create_state, switch_stage


def _llm_for_chat_input_normalize():
    try:
        p = get_llm_provider()
        return getattr(p, "langchain_llm", None)
    except Exception:
        return None


if TYPE_CHECKING:
    from app.features.user.models import User

logger = get_logger(__name__)

_UNAUTH_TURN = AgentChatTurn(
    messages=["暂时没法继续对话，请先登录后再试。"], skip_tts=True
)


async def _fetch_interview_memory_evidence(
    db: AsyncSession,
    user_id: str,
    user_message: str,
) -> str:
    """按本轮用户话检索记忆，格式化为短文本；失败或未启用时返回空串。"""
    from app.core.dependencies import get_embedding_provider
    from app.features.memory.evidence_format import format_evidence_chunks_for_prompt
    from app.features.memory.service import MemoryService

    if not settings.chat_memory_retrieval_enabled:
        return ""
    msg = (user_message or "").strip()
    if not msg:
        return ""
    try:
        ms = MemoryService(db, embedding_provider=get_embedding_provider())
        bundle = await ms.retrieve(user_id, msg, top_k=settings.chat_memory_top_k)
        text = format_evidence_chunks_for_prompt(bundle.model_dump())
        t = (text or "").strip()
        if not t:
            return ""
        max_c = settings.chat_memory_evidence_max_chars
        if len(t) > max_c:
            return t[: max_c - 3] + "..."
        return t
    except Exception as e:
        try:
            await db.rollback()
        except Exception as rollback_error:
            logger.warning("访谈记忆检索失败后回滚也失败: {}", rollback_error)
        logger.warning("访谈记忆检索失败: {}", e)
        return ""


class ChatOrchestrator:
    """
    聊天编排器：根据用户资料完成度路由到 ProfileAgent 或 InterviewAgent。
    不直接写入 Redis/DB；由 WS pipeline / ConversationHistoryStore 落库并同步缓存。
    """

    def __init__(self):
        self.profile_agent = ProfileAgent()
        self.interview_agent = InterviewAgent()

    async def process_user_message(
        self,
        conversation_id: str,
        user_message: str,
        user: Optional["User"],
        conversation,  # 用于更新 conversation_stage
        is_from_voice: bool,
        voice_session_id: Optional[str],
        db: AsyncSession,
        apply_extracted_profile_fn,
        get_missing_profile_fields_fn,
        get_filled_profile_fields_fn,
        user_message_timestamp: Optional[datetime] = None,
        audio_duration_seconds: Optional[int] = None,
    ) -> AgentChatTurn:
        """
        处理用户消息，返回 AI 回复（分段 + 是否跳过 TTS）。
        根据 missing_fields 路由到 ProfileAgent 或 InterviewAgent。
        """
        t0 = time.perf_counter()

        # --- 资料收集模式 ---
        if user:
            missing = get_missing_profile_fields_fn(user)
            if missing:
                try:
                    log_agent_detail(
                        logger,
                        "ChatOrchestrator route=profile conversation_id={} "
                        "missing_fields={} user_msg_len={}",
                        conversation_id,
                        missing,
                        len(user_message or ""),
                    )
                    extracted = await self.profile_agent.extract_profile_from_message(
                        user_message, missing, conversation_id=conversation_id
                    )
                    if extracted:
                        await apply_extracted_profile_fn(user, extracted, db)

                    remaining = get_missing_profile_fields_fn(user)
                    filled = get_filled_profile_fields_fn(user)
                    interview_stage_hint = ""
                    if not remaining:
                        st = await get_or_create_state(user.id, db)
                        interview_stage_hint = life_stage_display_name(st.current_stage)
                    responses = await self.profile_agent.generate_profile_followup(
                        conversation_id=conversation_id,
                        user_message=user_message,
                        missing_fields=remaining,
                        filled_fields=filled,
                        nickname=user.nickname or "",
                        interview_stage_hint=interview_stage_hint,
                    )
                    if agent_summary_enabled():
                        logger.info(
                            "ChatOrchestrator.process_user_message route=profile "
                            "duration_ms={:.2f} conversation_id={} response_segments={}",
                            (time.perf_counter() - t0) * 1000,
                            conversation_id,
                            len(responses),
                        )
                    return AgentChatTurn(messages=responses, skip_tts=False)
                except Exception as e:
                    logger.error(f"资料收集处理失败: {e}", exc_info=True)
                    return AgentChatTurn(
                        messages=["不好意思刚才没接住，你再说一遍好吗？"],
                        skip_tts=False,
                    )

        # --- 正式访谈模式 ---
        user_id = user.id if user else None
        if not user_id:
            if agent_summary_enabled():
                logger.info(
                    "ChatOrchestrator.process_user_message route=unauth "
                    "duration_ms={:.2f} conversation_id={}",
                    (time.perf_counter() - t0) * 1000,
                    conversation_id,
                )
            return _UNAUTH_TURN

        log_agent_detail(
            logger,
            "ChatOrchestrator route=interview conversation_id={} user_msg_len={}",
            conversation_id,
            len(user_message or ""),
        )
        llm_n = None
        if settings.chat_input_normalize_enabled and (
            (settings.chat_input_normalize_mode or "").strip().lower() == "llm"
        ):
            llm_n = _llm_for_chat_input_normalize()
        normalized_user_message = normalize_chat_input_for_agent(
            user_message or "",
            llm=llm_n,
        )
        state = await get_or_create_state(user_id, db)
        detected = await detect_primary_life_stage(
            normalized_user_message,
            state.current_stage,
            self.interview_agent.llm,
        )
        if detected != state.current_stage:
            state = await switch_stage(user_id, detected, db)

        if conversation and conversation.conversation_stage != state.current_stage:
            conversation.conversation_stage = state.current_stage
            await db.commit()

        from app.agents.chat.background_voice import infer_background_voice
        from app.agents.chat.prompts_profile import format_user_profile_context

        user_profile_context = ""
        background_voice = "default"
        if user:
            user_profile_context = format_user_profile_context(
                birth_year=user.birth_year,
                birth_place=user.birth_place,
                grew_up_place=user.grew_up_place,
                occupation=user.occupation,
            )
            background_voice = infer_background_voice(user.occupation)

        memory_evidence_text = await _fetch_interview_memory_evidence(
            db, user_id, normalized_user_message
        )

        turn = await self.interview_agent.generate_response_with_state(
            conversation_id=conversation_id,
            user_message=user_message,
            memoir_state=state,
            user_profile_context=user_profile_context,
            detected_user_stage=detected,
            memory_evidence_text=memory_evidence_text,
            background_voice=background_voice,
            normalized_user_message=normalized_user_message,
        )
        if agent_summary_enabled():
            logger.info(
                "ChatOrchestrator.process_user_message route=interview "
                "duration_ms={:.2f} conversation_id={} stage={} response_segments={} skip_tts={}",
                (time.perf_counter() - t0) * 1000,
                conversation_id,
                state.current_stage,
                len(turn.messages),
                turn.skip_tts,
            )
        return turn

    async def extract_profile_from_message(
        self,
        user_message: str,
        missing_fields: List[str],
        conversation_id: Optional[str] = None,
    ):
        """委托 ProfileAgent 提取资料"""
        return await self.profile_agent.extract_profile_from_message(
            user_message, missing_fields, conversation_id=conversation_id
        )

    async def generate_profile_followup(
        self,
        conversation_id: str,
        user_message: str,
        missing_fields: List[str],
        filled_fields: dict,
        nickname: str = "",
        is_from_voice: bool = False,
        voice_session_id: str | None = None,
        user_message_timestamp: datetime | None = None,
        audio_duration_seconds: int | None = None,
    ) -> List[str]:
        """委托 ProfileAgent 生成资料追问（持久化由调用方负责）。"""
        return await self.profile_agent.generate_profile_followup(
            conversation_id=conversation_id,
            user_message=user_message,
            missing_fields=missing_fields,
            filled_fields=filled_fields,
            nickname=nickname,
        )

    async def generate_profile_greeting(
        self,
        conversation_id: str,
        missing_fields: List[str],
        nickname: str = "",
    ) -> List[str]:
        """委托 ProfileAgent 生成资料收集开场白（持久化由调用方负责）。"""
        return await self.profile_agent.generate_profile_greeting(
            conversation_id=conversation_id,
            missing_fields=missing_fields,
            nickname=nickname,
        )

    async def generate_response_with_state(
        self,
        conversation_id: str,
        user_message: str,
        memoir_state: MemoirStateSchema,
        user_profile_context: str = "",
        is_from_voice: bool = False,
        voice_session_id: str | None = None,
        user_message_timestamp: datetime | None = None,
        audio_duration_seconds: int | None = None,
        detected_user_stage: str | None = None,
        memory_evidence_text: str = "",
        background_voice: str = "default",
        normalized_user_message: str | None = None,
    ) -> AgentChatTurn:
        """委托 InterviewAgent 生成访谈回复（持久化由调用方负责）。"""
        return await self.interview_agent.generate_response_with_state(
            conversation_id=conversation_id,
            user_message=user_message,
            memoir_state=memoir_state,
            user_profile_context=user_profile_context,
            detected_user_stage=detected_user_stage,
            memory_evidence_text=memory_evidence_text,
            background_voice=background_voice,
            normalized_user_message=normalized_user_message,
        )

    def detect_user_stage(self, user_message: str) -> str:
        """委托 InterviewAgent 检测用户阶段"""
        return self.interview_agent._detect_user_stage(user_message)

    async def generate_opening_message(
        self,
        conversation_id: str,
        memoir_state: MemoirStateSchema,
        user_profile_context: str = "",
        background_voice: str = "default",
    ) -> List[str]:
        """
        委托 InterviewAgent 生成访谈开场白（持久化由调用方 ConversationHistoryStore 负责）。
        """
        return await self.interview_agent.generate_opening_message(
            conversation_id=conversation_id,
            memoir_state=memoir_state,
            user_profile_context=user_profile_context,
            background_voice=background_voice,
        )