"""
ChatOrchestrator：AI 回复用户模块的编排层
负责路由（Profile vs Interview）、调用 Specialist Agent、统一 Redis 持久化与错误处理
"""
from datetime import datetime
from typing import TYPE_CHECKING, List, Optional

from sqlalchemy.ext.asyncio import AsyncSession

from app.agents.chat.helpers import save_message
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.logging import get_logger
from app.features.memoir.state_service import get_or_create_state

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

logger = get_logger(__name__)


class ChatOrchestrator:
    """
    聊天编排器：根据用户资料完成度路由到 ProfileAgent 或 InterviewAgent，
    统一管理 Redis 写入。
    """

    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,
    ) -> List[str]:
        """
        处理用户消息，返回 AI 回复列表。
        根据 missing_fields 路由到 ProfileAgent 或 InterviewAgent，
        统一写入 Redis。
        """

        # --- 资料收集模式 ---
        if user:
            missing = get_missing_profile_fields_fn(user)
            if missing:
                try:
                    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)
                    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 "",
                    )
                    await self._save_messages(
                        conversation_id=conversation_id,
                        user_message=user_message,
                        response_text="\n\n".join(responses),
                        is_from_voice=is_from_voice,
                        voice_session_id=voice_session_id,
                        user_message_timestamp=user_message_timestamp,
                    )
                    return responses
                except Exception as e:
                    logger.error(f"资料收集处理失败: {e}", exc_info=True)

        # --- 正式访谈模式 ---
        user_id = user.id if user else None
        if not user_id:
            return ["抱歉，无法识别用户。"]

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

        from app.agents.chat.prompts_profile import format_user_profile_context

        user_profile_context = ""
        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,
            )

        responses = 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,
        )
        await self._save_messages(
            conversation_id=conversation_id,
            user_message=user_message,
            response_text="\n\n".join(responses),
            is_from_voice=is_from_voice,
            voice_session_id=voice_session_id,
            user_message_timestamp=user_message_timestamp,
        )
        return responses

    async def _save_messages(
        self,
        conversation_id: str,
        user_message: str,
        response_text: str,
        is_from_voice: bool = False,
        voice_session_id: Optional[str] = None,
        user_message_timestamp: Optional[datetime] = None,
    ) -> None:
        """统一写入 Human + AI 消息到 Redis"""
        human_msg_type = "audio" if is_from_voice else "text"
        await save_message(
            conversation_id,
            "human",
            user_message,
            message_type=human_msg_type,
            voice_session_id=voice_session_id,
            timestamp=user_message_timestamp,
        )
        await save_message(conversation_id, "ai", response_text)

    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,
    ) -> List[str]:
        """委托 ProfileAgent 生成资料追问，并写入 Redis"""
        responses = 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,
        )
        response_text = "\n\n".join(responses)
        await self._save_messages(
            conversation_id=conversation_id,
            user_message=user_message,
            response_text=response_text,
            is_from_voice=is_from_voice,
            voice_session_id=voice_session_id,
            user_message_timestamp=user_message_timestamp,
        )
        return responses

    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，并写入 Redis"""
        responses = await self.profile_agent.generate_profile_greeting(
            conversation_id=conversation_id,
            missing_fields=missing_fields,
            nickname=nickname,
        )
        response_text = "\n\n".join(responses)
        await save_message(conversation_id, "ai", response_text)
        return responses

    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,
    ) -> List[str]:
        """委托 InterviewAgent 生成访谈回复，并写入 Redis"""
        responses = 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,
        )
        response_text = "\n\n".join(responses)
        await self._save_messages(
            conversation_id=conversation_id,
            user_message=user_message,
            response_text=response_text,
            is_from_voice=is_from_voice,
            voice_session_id=voice_session_id,
            user_message_timestamp=user_message_timestamp,
        )
        return responses

    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 = "",
    ) -> List[str]:
        """委托 InterviewAgent 生成开场白，并写入 Redis"""
        responses = await self.interview_agent.generate_opening_message(
            conversation_id=conversation_id,
            memoir_state=memoir_state,
            user_profile_context=user_profile_context,
        )
        response_text = "\n\n".join(responses)
        await save_message(conversation_id, "ai", response_text)
        return responses