from fastapi import APIRouter, Depends
from sqlalchemy.orm import Session
from starlette.responses import StreamingResponse

from app.core.response import ApiResponse, ok
from app.core.user_context import UserContext, get_user_context
from app.db.session import get_db
from app.schemas.evaluation import CreateEvaluationRequest, EvaluationResponse
from app.schemas.session import (
    ChatRequest,
    ChatResponse,
    CreateOrderRequest,
    CreateOrderResponse,
    CreateSessionRequest,
    CreateSessionResponse,
    OrderItemsResponse,
    SessionStatusResponse,
    SubmitDiagnosisRequest,
    SubmitDiagnosisResponse,
    SubmitTreatmentRequest,
    SubmitTreatmentResponse,
    HintRequest,
    HintResponse,
)
from app.services.evaluation_service import EvaluationService
from app.services.order_service import OrderService
from app.services.session_service import SessionService

router = APIRouter()


@router.post("", response_model=ApiResponse[CreateSessionResponse])
def create_session(
    payload: CreateSessionRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """创建训练会话：初始化 user_id 隔离的训练会话和短期 memory。"""
    result = SessionService(db).create_session(ctx, payload)
    db.commit()
    return ok(result)


@router.post("/{session_id}/chat", response_model=ApiResponse[ChatResponse])
async def chat(
    session_id: int,
    payload: ChatRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """非流式问诊：发送医生问题并返回 AI 病人回复。"""
    result = await SessionService(db).chat(ctx, session_id, payload.message)
    db.commit()
    return ok(result)


@router.post("/{session_id}/chat/stream", response_class=StreamingResponse)
async def chat_stream(
    session_id: int,
    payload: ChatRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """流式问诊：返回 SSE 格式的 AI 病人增量回复。"""
    response = await SessionService(db).stream_chat(ctx, session_id, payload.message)
    db.commit()
    return StreamingResponse(
        response,
        media_type="text/event-stream",
        headers={
            "Cache-Control": "no-cache",
            "Connection": "keep-alive",
            "X-Accel-Buffering": "no",
        },
    )


@router.get("/{session_id}/order-items", response_model=ApiResponse[OrderItemsResponse])
def list_order_items(
    session_id: int,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """检查项目列表：返回当前病例可申请项目，不返回检查结果。"""
    return ok(OrderService(db).list_order_items(session_id, ctx.user_id))


@router.post("/{session_id}/orders", response_model=ApiResponse[CreateOrderResponse])
def create_order(
    session_id: int,
    payload: CreateOrderRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """申请检查检验：从数据库读取并返回结构化结果。"""
    result = OrderService(db).create_order(session_id, ctx.user_id, payload.item_code)
    db.commit()
    return ok(result)


@router.post("/{session_id}/complete-inquiry", response_model=ApiResponse[SessionStatusResponse])
def complete_inquiry(
    session_id: int,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """完成问诊：从问诊阶段进入诊断阶段。"""
    result = SessionService(db).complete_inquiry(ctx, session_id)
    db.commit()
    return ok(result)


@router.post("/{session_id}/hints", response_model=ApiResponse[HintResponse])
async def generate_hints(
    session_id: int,
    payload: HintRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """新手模式提示：根据当前问诊上下文生成缺失维度和下一步问题。"""
    result = await SessionService(db).generate_hints(ctx, session_id, payload)
    db.commit()
    return ok(result)


@router.post("/{session_id}/hints/stream", response_class=StreamingResponse)
async def stream_hints(
    session_id: int,
    payload: HintRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """流式练习提示：返回一句话形式的 SSE 提示。"""
    response = await SessionService(db).stream_hints(ctx, session_id, payload)
    db.commit()
    return StreamingResponse(
        response,
        media_type="text/event-stream",
        headers={
            "Cache-Control": "no-cache",
            "Connection": "keep-alive",
            "X-Accel-Buffering": "no",
        },
    )


@router.get("/{session_id}/physical-exams", response_model=ApiResponse[OrderItemsResponse])
def list_physical_exam_items(
    session_id: int,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """体格检查列表：返回当前病例可申请的体格检查项目。"""
    return ok(OrderService(db).list_physical_exam_items(session_id, ctx.user_id))


@router.get("/{session_id}/auxiliary-exams", response_model=ApiResponse[OrderItemsResponse])
def list_auxiliary_exam_items(
    session_id: int,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """辅助检查列表：返回当前病例可申请的辅助检查项目。"""
    return ok(OrderService(db).list_auxiliary_exam_items(session_id, ctx.user_id))


@router.post("/{session_id}/physical-exams/{item_code}", response_model=ApiResponse[CreateOrderResponse])
def create_physical_exam_order(
    session_id: int,
    item_code: str,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """体格检查结果：按项目编码返回数据库固定结果。"""
    result = OrderService(db).create_physical_exam_order(session_id, ctx.user_id, item_code)
    db.commit()
    return ok(result)


@router.post("/{session_id}/auxiliary-exams/{item_code}", response_model=ApiResponse[CreateOrderResponse])
def create_auxiliary_exam_order(
    session_id: int,
    item_code: str,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """辅助检查结果：按项目编码返回数据库固定结果。"""
    result = OrderService(db).create_auxiliary_exam_order(session_id, ctx.user_id, item_code)
    db.commit()
    return ok(result)


@router.post("/{session_id}/diagnosis", response_model=ApiResponse[SubmitDiagnosisResponse])
def submit_diagnosis(
    session_id: int,
    payload: SubmitDiagnosisRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """提交诊断：保存主要诊断、鉴别诊断和诊断依据。"""
    result = SessionService(db).submit_diagnosis(ctx, session_id, payload)
    db.commit()
    return ok(result)


@router.post("/{session_id}/treatment", response_model=ApiResponse[SubmitTreatmentResponse])
def submit_treatment(
    session_id: int,
    payload: SubmitTreatmentRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """提交治疗方案：保存治疗、风险、沟通和随访内容。"""
    result = SessionService(db).submit_treatment(ctx, session_id, payload)
    db.commit()
    return ok(result)


@router.post("/{session_id}/evaluation", response_model=ApiResponse[EvaluationResponse])
async def create_evaluation(
    session_id: int,
    payload: CreateEvaluationRequest,
    ctx: UserContext = Depends(get_user_context),
    db: Session = Depends(get_db),
):
    """生成评价报告：检索指南并调用 Scoring Agent 生成结构化评价。"""
    result = await EvaluationService(db).create_evaluation(ctx, session_id, payload)
    db.commit()
    return ok(result)