from datetime import UTC, date, datetime, timedelta

from fastapi import APIRouter, Depends, HTTPException, Query, Request, status
from sqlalchemy import func, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.api.deps import ensure_service_employee, get_current_telegram_user, log_audit
from app.db.session import get_session
from app.models.car import (
    Car,
    CarServiceLink,
    MaintenanceRecommendation,
    ServiceAppointment,
    ServiceCenter,
    ServiceCenterBookingSettings,
    ServiceCenterHoliday,
    ServiceVisit,
)
from app.models.user import User
from app.schemas.service_center import ServiceVisitRead
from app.schemas.sto_booking import (
    AppointmentCancel,
    AppointmentCreate,
    AppointmentCreateWorkOrder,
    AppointmentDecision,
    AppointmentProposeTime,
    AppointmentRead,
    AvailableSlotRead,
    MaintenanceRecommendationBook,
    MaintenanceRecommendationCreate,
    MaintenanceRecommendationRead,
    ServiceCatalogItem,
    ServiceCenterBookingSettingsRead,
    ServiceCenterBookingSettingsUpsert,
    ServiceCenterHolidayCreate,
    ServiceCenterHolidayRead,
    STODashboardRead,
)
from app.services.rate_limit import check_rate_limit
from app.services.sto_booking import (
    calculate_available_slots,
    create_service_notification,
    ensure_oil_recommendation,
    ensure_slot_available,
    estimate_duration,
    get_booking_settings,
    money_to_float,
    notify_service_staff,
)
from app.services.work_orders import add_status_history, assign_work_order_number

APPROVED_SERVICE_STATUSES = {"verified", "approved"}

router = APIRouter(tags=["sto-booking"])


def _utc(value: datetime) -> datetime:
    if value.tzinfo is None:
        return value.replace(tzinfo=UTC)
    return value.astimezone(UTC)


async def _approved_service_center(session: AsyncSession, service_center_id: int) -> ServiceCenter:
    center = await session.get(ServiceCenter, service_center_id)
    if center is None or center.verification_status not in APPROVED_SERVICE_STATUSES:
        raise HTTPException(status_code=404, detail="Service center not found")
    return center


async def _owned_vehicle(session: AsyncSession, vehicle_id: int, user: User) -> Car:
    vehicle = await session.get(Car, vehicle_id)
    if vehicle is None:
        raise HTTPException(status_code=404, detail="Vehicle not found")
    if vehicle.owner_id != user.id:
        raise HTTPException(status_code=403, detail="Forbidden")
    return vehicle


async def _appointment_for_owner(session: AsyncSession, appointment_id: int, user: User) -> ServiceAppointment:
    appointment = await session.get(ServiceAppointment, appointment_id)
    if appointment is None:
        raise HTTPException(status_code=404, detail="Appointment not found")
    if appointment.owner_id != user.id:
        raise HTTPException(status_code=403, detail="Forbidden")
    return appointment


async def _appointment_for_sto(session: AsyncSession, appointment_id: int, user: User) -> ServiceAppointment:
    appointment = await session.get(ServiceAppointment, appointment_id)
    if appointment is None:
        raise HTTPException(status_code=404, detail="Appointment not found")
    await ensure_service_employee(session, appointment.service_center_id, user, {"owner", "manager", "receptionist"})
    return appointment


def _ensure_appointment_deletable(appointment: ServiceAppointment) -> None:
    if appointment.linked_work_order_id or appointment.status in {"converted_to_work_order", "completed"}:
        raise HTTPException(status_code=409, detail="Appointment already has a work order and cannot be deleted")


async def _restore_recommendation_after_appointment_delete(
    session: AsyncSession,
    appointment: ServiceAppointment,
) -> None:
    if not appointment.source_recommendation_id:
        return
    recommendation = await session.get(MaintenanceRecommendation, appointment.source_recommendation_id)
    if recommendation is not None and recommendation.status == "booked":
        recommendation.status = "active"
        recommendation.source_appointment_id = None


@router.get("/sto/catalog", response_model=list[ServiceCatalogItem])
async def get_sto_catalog(
    city: str | None = None,
    specialization: str | None = None,
    open_today: bool = False,
    has_slots: bool = False,
    session: AsyncSession = Depends(get_session),
) -> list[ServiceCatalogItem]:
    stmt = select(ServiceCenter).where(ServiceCenter.verification_status.in_(APPROVED_SERVICE_STATUSES))
    if city:
        stmt = stmt.where(ServiceCenter.city.ilike(f"%{city}%"))
    if specialization:
        stmt = stmt.where(ServiceCenter.specializations.is_not(None))
    stmt = stmt.order_by(ServiceCenter.rating_avg.desc().nullslast(), ServiceCenter.display_name.asc())
    centers = list((await session.execute(stmt)).scalars())
    today = date.today()
    result: list[ServiceCatalogItem] = []
    for center in centers:
        settings = await get_booking_settings(session, center.id)
        if open_today and today.weekday() not in (settings.working_days or []):
            continue
        if specialization and specialization.lower() not in " ".join(center.specializations or []).lower():
            continue
        nearest_slot_at = None
        if has_slots or settings.accepts_online_booking:
            slots = await calculate_available_slots(
                session,
                service_center_id=center.id,
                date_from=today,
                date_to=today + timedelta(days=14),
                duration_minutes=60,
                limit=1,
            )
            nearest_slot_at = slots[0][0] if slots else None
            if has_slots and nearest_slot_at is None:
                continue
        result.append(
            ServiceCatalogItem(
                id=center.id,
                display_name=center.display_name,
                name=center.name,
                city=center.city,
                address=center.address,
                specializations=center.specializations,
                working_hours=center.working_hours,
                rating_avg=float(center.rating_avg) if center.rating_avg is not None else None,
                reviews_count=center.reviews_count,
                nearest_slot_at=nearest_slot_at,
                accepts_online_booking=settings.accepts_online_booking,
            )
        )
    return result


@router.get("/sto/{service_center_id}/available-slots", response_model=list[AvailableSlotRead])
async def get_available_slots(
    service_center_id: int,
    service_type: str = "maintenance",
    date_from: date | None = None,
    date_to: date | None = None,
    duration_minutes: int | None = Query(default=None, ge=10, le=1440),
    session: AsyncSession = Depends(get_session),
) -> list[AvailableSlotRead]:
    await _approved_service_center(session, service_center_id)
    start_date = date_from or date.today()
    end_date = date_to or start_date + timedelta(days=14)
    if end_date < start_date:
        raise HTTPException(status_code=400, detail="date_to must be after date_from")
    duration = estimate_duration(service_type, duration_minutes)
    slots = await calculate_available_slots(
        session,
        service_center_id=service_center_id,
        date_from=start_date,
        date_to=end_date,
        duration_minutes=duration,
    )
    return [AvailableSlotRead(start_at=start, end_at=end) for start, end in slots]


@router.post("/appointments", response_model=AppointmentRead, status_code=status.HTTP_201_CREATED)
async def create_appointment(
    payload: AppointmentCreate,
    request: Request,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceAppointment:
    await check_rate_limit(scope="appointment_create", limit=20, window_seconds=3600, request=request, user=current_user, session=session)
    await _approved_service_center(session, payload.service_center_id)
    vehicle = await _owned_vehicle(session, payload.vehicle_id, current_user)
    duration = estimate_duration(payload.service_type, payload.estimated_duration_minutes)
    start_at = _utc(payload.requested_start_at)
    end_at = await ensure_slot_available(
        session,
        service_center_id=payload.service_center_id,
        start_at=start_at,
        duration_minutes=duration,
    )
    if payload.source_recommendation_id:
        recommendation = await session.get(MaintenanceRecommendation, payload.source_recommendation_id)
        if recommendation is None or recommendation.vehicle_id != vehicle.id:
            raise HTTPException(status_code=400, detail="Recommendation does not belong to vehicle")
    appointment = ServiceAppointment(
        service_center_id=payload.service_center_id,
        vehicle_id=vehicle.id,
        owner_id=current_user.id,
        created_by=current_user.id,
        service_type=payload.service_type,
        service_name=payload.service_name,
        requested_start_at=start_at,
        requested_end_at=end_at,
        estimated_duration_minutes=duration,
        status="requested",
        customer_comment=payload.customer_comment,
        source_recommendation_id=payload.source_recommendation_id,
    )
    session.add(appointment)
    await session.flush()
    if payload.source_recommendation_id:
        recommendation.status = "booked"
        recommendation.source_appointment_id = appointment.id
    await notify_service_staff(
        session,
        service_center_id=appointment.service_center_id,
        notification_type="appointment.requested",
        title="Новая заявка на запись",
        body=f"{appointment.service_name}: {appointment.requested_start_at:%Y-%m-%d %H:%M}",
        appointment_id=appointment.id,
    )
    await log_audit(
        session,
        actor=current_user,
        action="appointment.create",
        target_type="service_appointment",
        target_id=appointment.id,
    )
    await session.commit()
    await session.refresh(appointment)
    return appointment


@router.get("/appointments/my", response_model=list[AppointmentRead])
async def get_my_appointments(
    status_filter: str | None = Query(default=None, alias="status"),
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> list[ServiceAppointment]:
    stmt = (
        select(ServiceAppointment)
        .where(ServiceAppointment.owner_id == current_user.id)
        .order_by(ServiceAppointment.requested_start_at.desc())
    )
    if status_filter:
        stmt = stmt.where(ServiceAppointment.status == status_filter)
    return list((await session.execute(stmt)).scalars())


@router.post("/appointments/{appointment_id}/cancel", response_model=AppointmentRead)
async def cancel_appointment(
    appointment_id: int,
    payload: AppointmentCancel,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceAppointment:
    appointment = await _appointment_for_owner(session, appointment_id, current_user)
    if appointment.status in {"completed", "cancelled_by_owner", "cancelled_by_customer", "cancelled_by_sto"}:
        raise HTTPException(status_code=409, detail="Appointment cannot be cancelled")
    appointment.status = "cancelled_by_owner"
    appointment.cancelled_at = datetime.now(UTC)
    appointment.cancellation_reason = payload.reason
    await notify_service_staff(
        session,
        service_center_id=appointment.service_center_id,
        notification_type="appointment.cancelled_by_owner",
        title="Клиент отменил запись",
        body=payload.reason,
        appointment_id=appointment.id,
    )
    await log_audit(session, actor=current_user, action="appointment.cancel", target_type="service_appointment", target_id=appointment_id)
    await session.commit()
    await session.refresh(appointment)
    return appointment


@router.delete("/appointments/{appointment_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_appointment_by_owner(
    appointment_id: int,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> None:
    appointment = await _appointment_for_owner(session, appointment_id, current_user)
    _ensure_appointment_deletable(appointment)
    await _restore_recommendation_after_appointment_delete(session, appointment)
    await notify_service_staff(
        session,
        service_center_id=appointment.service_center_id,
        notification_type="appointment.deleted_by_owner",
        title="Клиент удалил запись",
        body=f"{appointment.service_name}: {appointment.requested_start_at:%Y-%m-%d %H:%M}",
        appointment_id=None,
    )
    await log_audit(
        session,
        actor=current_user,
        action="appointment.delete_by_owner",
        target_type="service_appointment",
        target_id=appointment_id,
    )
    await session.delete(appointment)
    await session.commit()


@router.post("/appointments/{appointment_id}/accept-proposed-time", response_model=AppointmentRead)
async def accept_proposed_time(
    appointment_id: int,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceAppointment:
    appointment = await _appointment_for_owner(session, appointment_id, current_user)
    if appointment.status != "proposed_new_time" or not appointment.proposed_start_at or not appointment.proposed_end_at:
        raise HTTPException(status_code=409, detail="Appointment has no proposed time")
    await ensure_slot_available(
        session,
        service_center_id=appointment.service_center_id,
        start_at=appointment.proposed_start_at,
        duration_minutes=appointment.estimated_duration_minutes,
        exclude_appointment_id=appointment.id,
    )
    appointment.confirmed_start_at = appointment.proposed_start_at
    appointment.confirmed_end_at = appointment.proposed_end_at
    appointment.requested_start_at = appointment.proposed_start_at
    appointment.requested_end_at = appointment.proposed_end_at
    appointment.status = "confirmed"
    await notify_service_staff(
        session,
        service_center_id=appointment.service_center_id,
        notification_type="appointment.proposed_time_accepted",
        title="Клиент принял новое время",
        appointment_id=appointment.id,
    )
    await log_audit(session, actor=current_user, action="appointment.accept_proposed_time", target_type="service_appointment", target_id=appointment_id)
    await session.commit()
    await session.refresh(appointment)
    return appointment


@router.post("/appointments/{appointment_id}/reject-proposed-time", response_model=AppointmentRead)
async def reject_proposed_time(
    appointment_id: int,
    payload: AppointmentDecision,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceAppointment:
    appointment = await _appointment_for_owner(session, appointment_id, current_user)
    if appointment.status != "proposed_new_time":
        raise HTTPException(status_code=409, detail="Appointment has no proposed time")
    appointment.status = "rejected_by_sto"
    appointment.service_center_comment = payload.comment
    await notify_service_staff(
        session,
        service_center_id=appointment.service_center_id,
        notification_type="appointment.proposed_time_rejected",
        title="Клиент отклонил новое время",
        body=payload.comment,
        appointment_id=appointment.id,
    )
    await log_audit(session, actor=current_user, action="appointment.reject_proposed_time", target_type="service_appointment", target_id=appointment_id)
    await session.commit()
    await session.refresh(appointment)
    return appointment


@router.get("/sto/dashboard", response_model=STODashboardRead)
async def get_sto_dashboard(
    service_center_id: int,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> STODashboardRead:
    await ensure_service_employee(session, service_center_id, current_user)
    center = await session.get(ServiceCenter, service_center_id)
    if center is None:
        raise HTTPException(status_code=404, detail="Service center not found")
    month_start = date.today().replace(day=1)
    connected_vehicles = int(
        (await session.execute(select(func.count(CarServiceLink.id)).where(
            CarServiceLink.service_center_id == service_center_id,
            CarServiceLink.status == "approved",
            CarServiceLink.is_active.is_(True),
        ))).scalar_one() or 0
    )
    pending_links = int(
        (await session.execute(select(func.count(CarServiceLink.id)).where(
            CarServiceLink.service_center_id == service_center_id,
            CarServiceLink.status == "pending",
        ))).scalar_one() or 0
    )
    pending_appointments = int(
        (await session.execute(select(func.count(ServiceAppointment.id)).where(
            ServiceAppointment.service_center_id == service_center_id,
            ServiceAppointment.status == "requested",
        ))).scalar_one() or 0
    )
    confirmed_appointments = int(
        (await session.execute(select(func.count(ServiceAppointment.id)).where(
            ServiceAppointment.service_center_id == service_center_id,
            ServiceAppointment.status.in_(["confirmed", "confirmed_by_sto"]),
        ))).scalar_one() or 0
    )
    active_work_orders = int(
        (await session.execute(select(func.count(ServiceVisit.id)).where(
            ServiceVisit.service_center_id == service_center_id,
            ServiceVisit.status.in_(["draft", "diagnosis", "waiting_owner_approval", "approved_by_owner", "in_progress", "pending_owner_confirmation"]),
        ))).scalar_one() or 0
    )
    completed_result = await session.execute(
        select(func.count(ServiceVisit.id), func.coalesce(func.sum(ServiceVisit.total_cost), 0)).where(
            ServiceVisit.service_center_id == service_center_id,
            ServiceVisit.status == "confirmed",
            ServiceVisit.visit_date >= month_start,
        )
    )
    completed_count, revenue_month = completed_result.one()
    average_check = money_to_float(revenue_month) / int(completed_count or 1)
    warnings = []
    settings = await get_booking_settings(session, service_center_id)
    if not settings.accepts_online_booking:
        warnings.append("online_booking_disabled")
    if pending_links:
        warnings.append("pending_vehicle_links")
    if pending_appointments:
        warnings.append("pending_appointments")
    if not center.facade_photo_url:
        warnings.append("missing_facade_photo")
    return STODashboardRead(
        service_center_id=service_center_id,
        connected_vehicles=connected_vehicles,
        pending_vehicle_links=pending_links,
        active_appointments=pending_appointments + confirmed_appointments,
        pending_appointments=pending_appointments,
        confirmed_appointments=confirmed_appointments,
        active_work_orders=active_work_orders,
        completed_work_orders_month=int(completed_count or 0),
        revenue_month=money_to_float(revenue_month),
        average_check_month=average_check,
        rating_avg=float(center.rating_avg) if center.rating_avg is not None else None,
        reviews_count=center.reviews_count,
        warnings=warnings,
    )


@router.get("/sto/calendar", response_model=list[AppointmentRead])
async def get_sto_calendar(
    service_center_id: int,
    date_from: datetime | None = None,
    date_to: datetime | None = None,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> list[ServiceAppointment]:
    await ensure_service_employee(session, service_center_id, current_user)
    start_at = _utc(date_from or datetime.now(UTC) - timedelta(days=1))
    end_at = _utc(date_to or start_at + timedelta(days=30))
    stmt = (
        select(ServiceAppointment)
        .where(
            ServiceAppointment.service_center_id == service_center_id,
            ServiceAppointment.requested_start_at >= start_at,
            ServiceAppointment.requested_start_at <= end_at,
        )
        .order_by(ServiceAppointment.requested_start_at.asc())
    )
    return list((await session.execute(stmt)).scalars())


@router.get("/sto/appointments", response_model=list[AppointmentRead])
async def get_sto_appointments(
    service_center_id: int,
    status_filter: str | None = Query(default=None, alias="status"),
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> list[ServiceAppointment]:
    await ensure_service_employee(session, service_center_id, current_user)
    stmt = select(ServiceAppointment).where(ServiceAppointment.service_center_id == service_center_id)
    if status_filter:
        stmt = stmt.where(ServiceAppointment.status == status_filter)
    stmt = stmt.order_by(ServiceAppointment.requested_start_at.desc())
    return list((await session.execute(stmt)).scalars())


@router.post("/sto/appointments/{appointment_id}/confirm", response_model=AppointmentRead)
async def confirm_appointment(
    appointment_id: int,
    payload: AppointmentDecision,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceAppointment:
    appointment = await _appointment_for_sto(session, appointment_id, current_user)
    if appointment.status not in {"requested", "proposed_new_time"}:
        raise HTTPException(status_code=409, detail="Appointment cannot be confirmed")
    await ensure_slot_available(
        session,
        service_center_id=appointment.service_center_id,
        start_at=appointment.requested_start_at,
        duration_minutes=appointment.estimated_duration_minutes,
        exclude_appointment_id=appointment.id,
    )
    appointment.status = "confirmed_by_sto"
    appointment.confirmed_start_at = appointment.requested_start_at
    appointment.confirmed_end_at = appointment.requested_end_at
    appointment.service_center_comment = payload.comment
    await create_service_notification(
        session,
        recipient_user_id=appointment.owner_id,
        service_center_id=appointment.service_center_id,
        appointment_id=appointment.id,
        notification_type="appointment.confirmed",
        title="СТО подтвердило запись",
        body=f"{appointment.service_name}: {appointment.confirmed_start_at:%Y-%m-%d %H:%M}",
    )
    await log_audit(session, actor=current_user, action="appointment.confirm", target_type="service_appointment", target_id=appointment_id)
    await session.commit()
    await session.refresh(appointment)
    return appointment


@router.post("/sto/appointments/{appointment_id}/reject", response_model=AppointmentRead)
async def reject_appointment(
    appointment_id: int,
    payload: AppointmentDecision,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceAppointment:
    appointment = await _appointment_for_sto(session, appointment_id, current_user)
    if appointment.status in {"completed", "cancelled_by_owner", "cancelled_by_customer", "cancelled_by_sto"}:
        raise HTTPException(status_code=409, detail="Appointment cannot be rejected")
    appointment.status = "rejected_by_sto"
    appointment.service_center_comment = payload.comment
    await create_service_notification(
        session,
        recipient_user_id=appointment.owner_id,
        service_center_id=appointment.service_center_id,
        appointment_id=appointment.id,
        notification_type="appointment.rejected",
        title="СТО отклонило запись",
        body=payload.comment,
    )
    await log_audit(session, actor=current_user, action="appointment.reject", target_type="service_appointment", target_id=appointment_id)
    await session.commit()
    await session.refresh(appointment)
    return appointment


@router.delete("/sto/appointments/{appointment_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_appointment_by_sto(
    appointment_id: int,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> None:
    appointment = await _appointment_for_sto(session, appointment_id, current_user)
    _ensure_appointment_deletable(appointment)
    await _restore_recommendation_after_appointment_delete(session, appointment)
    await create_service_notification(
        session,
        recipient_user_id=appointment.owner_id,
        service_center_id=appointment.service_center_id,
        appointment_id=None,
        notification_type="appointment.deleted_by_sto",
        title="СТО удалило запись",
        body=f"{appointment.service_name}: {appointment.requested_start_at:%Y-%m-%d %H:%M}",
        idempotency_key=f"appointment:{appointment.id}:deleted_by_sto",
    )
    await log_audit(
        session,
        actor=current_user,
        action="appointment.delete_by_sto",
        target_type="service_appointment",
        target_id=appointment_id,
    )
    await session.delete(appointment)
    await session.commit()


@router.post("/sto/appointments/{appointment_id}/propose-time", response_model=AppointmentRead)
async def propose_appointment_time(
    appointment_id: int,
    payload: AppointmentProposeTime,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceAppointment:
    appointment = await _appointment_for_sto(session, appointment_id, current_user)
    if appointment.status in {"completed", "cancelled_by_owner", "cancelled_by_customer", "cancelled_by_sto"}:
        raise HTTPException(status_code=409, detail="Appointment cannot be changed")
    duration = estimate_duration(appointment.service_type, payload.estimated_duration_minutes or appointment.estimated_duration_minutes)
    proposed_start = _utc(payload.proposed_start_at)
    proposed_end = await ensure_slot_available(
        session,
        service_center_id=appointment.service_center_id,
        start_at=proposed_start,
        duration_minutes=duration,
        exclude_appointment_id=appointment.id,
    )
    appointment.estimated_duration_minutes = duration
    appointment.proposed_start_at = proposed_start
    appointment.proposed_end_at = proposed_end
    appointment.status = "proposed_new_time"
    appointment.service_center_comment = payload.comment
    await create_service_notification(
        session,
        recipient_user_id=appointment.owner_id,
        service_center_id=appointment.service_center_id,
        appointment_id=appointment.id,
        notification_type="appointment.proposed_new_time",
        title="СТО предложило другое время",
        body=f"{proposed_start:%Y-%m-%d %H:%M}",
    )
    await log_audit(session, actor=current_user, action="appointment.propose_time", target_type="service_appointment", target_id=appointment_id)
    await session.commit()
    await session.refresh(appointment)
    return appointment


@router.post("/sto/appointments/{appointment_id}/create-work-order", response_model=ServiceVisitRead, status_code=status.HTTP_201_CREATED)
async def create_work_order_from_appointment(
    appointment_id: int,
    payload: AppointmentCreateWorkOrder,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceVisit:
    appointment = await _appointment_for_sto(session, appointment_id, current_user)
    employee = await ensure_service_employee(session, appointment.service_center_id, current_user, {"owner", "manager", "receptionist"})
    if appointment.status not in {"confirmed", "confirmed_by_sto"}:
        raise HTTPException(status_code=409, detail="Only confirmed appointment can become work order")
    if appointment.linked_work_order_id:
        visit = await session.get(ServiceVisit, appointment.linked_work_order_id)
        if visit is None:
            raise HTTPException(status_code=404, detail="Linked work order not found")
        return visit
    vehicle = await session.get(Car, appointment.vehicle_id)
    if vehicle is None:
        raise HTTPException(status_code=404, detail="Vehicle not found")
    visit = ServiceVisit(
        service_center_id=appointment.service_center_id,
        vehicle_id=appointment.vehicle_id,
        owner_id=appointment.owner_id,
        created_by_employee_id=employee.id,
        assigned_employee_id=employee.id,
        visit_date=(appointment.confirmed_start_at or appointment.requested_start_at).date(),
        odometer=payload.odometer if payload.odometer is not None else vehicle.current_odometer,
        status="draft",
        customer_complaint=appointment.customer_comment,
        notes=payload.notes or appointment.customer_comment,
        opened_at=datetime.now(UTC),
    )
    session.add(visit)
    await session.flush()
    await assign_work_order_number(session, visit)
    await add_status_history(session, visit, to_status="diagnosis", actor=current_user, comment="Created from appointment")
    appointment.linked_work_order_id = visit.id
    appointment.status = "converted_to_work_order"
    await create_service_notification(
        session,
        recipient_user_id=appointment.owner_id,
        service_center_id=appointment.service_center_id,
        appointment_id=appointment.id,
        notification_type="work_order.created",
        title="СТО создало заказ-наряд",
        body=visit.work_order_number,
        idempotency_key=f"work_order:{visit.id}:created",
    )
    await log_audit(session, actor=current_user, action="appointment.create_work_order", target_type="service_appointment", target_id=appointment_id, metadata={"service_visit_id": visit.id})
    await session.commit()
    await session.refresh(visit)
    return visit


@router.get("/sto/settings/booking", response_model=ServiceCenterBookingSettingsRead)
async def read_booking_settings(
    service_center_id: int,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceCenterBookingSettings:
    await ensure_service_employee(session, service_center_id, current_user, {"owner", "manager", "receptionist"})
    return await get_booking_settings(session, service_center_id)


@router.post("/sto/settings/booking", response_model=ServiceCenterBookingSettingsRead)
async def upsert_booking_settings(
    payload: ServiceCenterBookingSettingsUpsert,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceCenterBookingSettings:
    await ensure_service_employee(session, payload.service_center_id, current_user, {"owner", "manager"})
    settings = await get_booking_settings(session, payload.service_center_id)
    for field, value in payload.model_dump(exclude={"service_center_id"}).items():
        setattr(settings, field, value)
    await log_audit(session, actor=current_user, action="sto_booking_settings.update", target_type="service_center", target_id=payload.service_center_id)
    await session.commit()
    await session.refresh(settings)
    return settings


@router.post("/sto/settings/holidays", response_model=ServiceCenterHolidayRead, status_code=status.HTTP_201_CREATED)
async def create_holiday(
    payload: ServiceCenterHolidayCreate,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> ServiceCenterHoliday:
    await ensure_service_employee(session, payload.service_center_id, current_user, {"owner", "manager"})
    holiday = ServiceCenterHoliday(**payload.model_dump())
    session.add(holiday)
    await log_audit(session, actor=current_user, action="sto_holiday.create", target_type="service_center", target_id=payload.service_center_id)
    await session.commit()
    await session.refresh(holiday)
    return holiday


@router.get("/vehicles/{vehicle_id}/maintenance-recommendations", response_model=list[MaintenanceRecommendationRead])
async def get_maintenance_recommendations(
    vehicle_id: int,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> list[MaintenanceRecommendation]:
    vehicle = await _owned_vehicle(session, vehicle_id, current_user)
    await ensure_oil_recommendation(session, vehicle)
    await session.commit()
    stmt = (
        select(MaintenanceRecommendation)
        .where(MaintenanceRecommendation.vehicle_id == vehicle_id)
        .order_by(MaintenanceRecommendation.status.asc(), MaintenanceRecommendation.due_date.asc().nullslast())
    )
    return list((await session.execute(stmt)).scalars())


@router.post("/vehicles/{vehicle_id}/maintenance-recommendations", response_model=MaintenanceRecommendationRead, status_code=status.HTTP_201_CREATED)
async def create_maintenance_recommendation(
    vehicle_id: int,
    payload: MaintenanceRecommendationCreate,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> MaintenanceRecommendation:
    await _owned_vehicle(session, vehicle_id, current_user)
    recommendation = MaintenanceRecommendation(vehicle_id=vehicle_id, status="active", **payload.model_dump())
    session.add(recommendation)
    await create_service_notification(
        session,
        recipient_user_id=current_user.id,
        notification_type="maintenance_recommendation.created",
        title="Добавлена рекомендация ТО",
        body=payload.title,
        send_telegram=False,
    )
    await log_audit(session, actor=current_user, action="maintenance_recommendation.create", target_type="vehicle", target_id=vehicle_id)
    await session.commit()
    await session.refresh(recommendation)
    return recommendation


@router.post("/maintenance-recommendations/{recommendation_id}/dismiss", response_model=MaintenanceRecommendationRead)
async def dismiss_maintenance_recommendation(
    recommendation_id: int,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> MaintenanceRecommendation:
    recommendation = await session.get(MaintenanceRecommendation, recommendation_id)
    if recommendation is None:
        raise HTTPException(status_code=404, detail="Recommendation not found")
    await _owned_vehicle(session, recommendation.vehicle_id, current_user)
    recommendation.status = "dismissed"
    await log_audit(session, actor=current_user, action="maintenance_recommendation.dismiss", target_type="maintenance_recommendation", target_id=recommendation_id)
    await session.commit()
    await session.refresh(recommendation)
    return recommendation


@router.post("/maintenance-recommendations/{recommendation_id}/book", response_model=MaintenanceRecommendationRead)
async def mark_recommendation_booked(
    recommendation_id: int,
    payload: MaintenanceRecommendationBook,
    session: AsyncSession = Depends(get_session),
    current_user: User = Depends(get_current_telegram_user),
) -> MaintenanceRecommendation:
    recommendation = await session.get(MaintenanceRecommendation, recommendation_id)
    if recommendation is None:
        raise HTTPException(status_code=404, detail="Recommendation not found")
    await _owned_vehicle(session, recommendation.vehicle_id, current_user)
    appointment = await _appointment_for_owner(session, payload.appointment_id, current_user)
    if appointment.vehicle_id != recommendation.vehicle_id:
        raise HTTPException(status_code=400, detail="Appointment does not match recommendation vehicle")
    recommendation.status = "booked"
    recommendation.source_appointment_id = appointment.id
    appointment.source_recommendation_id = recommendation.id
    await log_audit(session, actor=current_user, action="maintenance_recommendation.book", target_type="maintenance_recommendation", target_id=recommendation_id, metadata={"appointment_id": appointment.id})
    await session.commit()
    await session.refresh(recommendation)
    return recommendation