import uuid

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.deps import get_operator_role_label, get_current_user, get_db_session, require_study_not_locked, require_api_permission
from app.crud import audit as audit_crud
from app.crud import material_equipment as equipment_crud
from app.crud import study as study_crud
from app.schemas.material_equipment import MaterialEquipmentCreate, MaterialEquipmentRead, MaterialEquipmentUpdate

router = APIRouter()


async def _ensure_study_exists(db: AsyncSession, study_id: uuid.UUID):
    study = await study_crud.get(db, study_id)
    if not study:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="项目不存在")
    return study


def _validate_calibration(need_calibration: bool, calibration_cycle_days: int | None):
    if need_calibration and (calibration_cycle_days is None or calibration_cycle_days < 1):
        raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail="需要校准时校准周期必须大于0")


@router.post(
    "/equipment",
    response_model=MaterialEquipmentRead,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(require_api_permission("material_equipments:create")), Depends(require_study_not_locked())],
)
async def create_equipment(
    study_id: uuid.UUID,
    equipment_in: MaterialEquipmentCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> MaterialEquipmentRead:
    await _ensure_study_exists(db, study_id)
    _validate_calibration(equipment_in.need_calibration, equipment_in.calibration_cycle_days)
    if not equipment_in.need_calibration:
        equipment_in = equipment_in.model_copy(update={"calibration_cycle_days": None})
    item = await equipment_crud.create_equipment(db, study_id, equipment_in, created_by=current_user.id)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="material_equipment",
        entity_id=item.id,
        action="CREATE_MATERIAL_EQUIPMENT",
        detail=f"设备 {item.id} 已创建",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )
    return MaterialEquipmentRead.model_validate(item)


@router.get(
    "/equipment",
    response_model=list[MaterialEquipmentRead],
    dependencies=[Depends(require_api_permission("material_equipments:read"))],
)
async def list_equipments(
    study_id: uuid.UUID,
    name: str | None = None,
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db_session),
) -> list[MaterialEquipmentRead]:
    await _ensure_study_exists(db, study_id)
    items = await equipment_crud.list_equipments(db, study_id, name=name, skip=skip, limit=limit)
    return [MaterialEquipmentRead.model_validate(item) for item in items]


@router.get(
    "/equipment/{equipment_id}",
    response_model=MaterialEquipmentRead,
    dependencies=[Depends(require_api_permission("material_equipments:read"))],
)
async def get_equipment(
    study_id: uuid.UUID,
    equipment_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
) -> MaterialEquipmentRead:
    await _ensure_study_exists(db, study_id)
    item = await equipment_crud.get_equipment(db, equipment_id)
    if not item or item.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="设备记录不存在")
    return MaterialEquipmentRead.model_validate(item)


@router.patch(
    "/equipment/{equipment_id}",
    response_model=MaterialEquipmentRead,
    dependencies=[Depends(require_api_permission("material_equipments:update")), Depends(require_study_not_locked())],
)
async def update_equipment(
    study_id: uuid.UUID,
    equipment_id: uuid.UUID,
    equipment_in: MaterialEquipmentUpdate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> MaterialEquipmentRead:
    await _ensure_study_exists(db, study_id)
    item = await equipment_crud.get_equipment(db, equipment_id)
    if not item or item.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="设备记录不存在")

    next_need_calibration = equipment_in.need_calibration if equipment_in.need_calibration is not None else item.need_calibration
    next_cycle = equipment_in.calibration_cycle_days if equipment_in.calibration_cycle_days is not None else item.calibration_cycle_days
    _validate_calibration(next_need_calibration, next_cycle)
    if not next_need_calibration:
        equipment_in = equipment_in.model_copy(update={"calibration_cycle_days": None})

    item = await equipment_crud.update_equipment(db, item, equipment_in)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="material_equipment",
        entity_id=equipment_id,
        action="UPDATE_MATERIAL_EQUIPMENT",
        detail=f"设备 {equipment_id} 已更新",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )
    return MaterialEquipmentRead.model_validate(item)


@router.delete(
    "/equipment/{equipment_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(require_api_permission("material_equipments:delete")), Depends(require_study_not_locked())],
)
async def delete_equipment(
    study_id: uuid.UUID,
    equipment_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> None:
    await _ensure_study_exists(db, study_id)
    item = await equipment_crud.get_equipment(db, equipment_id)
    if not item or item.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="设备记录不存在")
    await equipment_crud.delete_equipment(db, item)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="material_equipment",
        entity_id=equipment_id,
        action="DELETE_MATERIAL_EQUIPMENT",
        detail=f"设备 {equipment_id} 已删除",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )