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 precaution as precaution_crud
from app.crud import site as site_crud
from app.crud import study as study_crud
from app.schemas.precaution import PrecautionCreate, PrecautionRead, PrecautionUpdate

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


async def _ensure_site_name_active(db: AsyncSession, study_id: uuid.UUID, site_name: str | None):
    if not site_name:
        return
    active_names = await site_crud.list_active_names(db, study_id)
    if site_name not in active_names:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="中心已停用")


@router.post(
    "/precautions",
    response_model=PrecautionRead,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(require_api_permission("precautions:create"))],
)
async def create_precaution(
    study_id: uuid.UUID,
    precaution_in: PrecautionCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> PrecautionRead:
    await _ensure_study_exists(db, study_id)
    await _ensure_site_name_active(db, study_id, precaution_in.site_name)
    precaution = await precaution_crud.create_precaution(db, study_id, precaution_in, created_by=current_user.id)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="precaution",
        entity_id=precaution.id,
        action="CREATE_PRECAUTION",
        detail=f"注意事项 {precaution.title} 已创建",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )
    return PrecautionRead.model_validate(precaution)


@router.get(
    "/precautions",
    response_model=list[PrecautionRead],
    dependencies=[Depends(require_api_permission("precautions:read"))],
)
async def list_precautions(
    study_id: uuid.UUID,
    site_name: str | None = None,
    keyword: str | None = None,
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db_session),
) -> list[PrecautionRead]:
    await _ensure_study_exists(db, study_id)
    items = await precaution_crud.list_precautions(db, study_id, site_name=site_name, keyword=keyword, skip=skip, limit=limit)
    return [PrecautionRead.model_validate(item) for item in items]


@router.get(
    "/precautions/{precaution_id}",
    response_model=PrecautionRead,
    dependencies=[Depends(require_api_permission("precautions:read"))],
)
async def get_precaution(
    study_id: uuid.UUID,
    precaution_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
) -> PrecautionRead:
    await _ensure_study_exists(db, study_id)
    precaution = await precaution_crud.get_precaution(db, precaution_id)
    if not precaution or precaution.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="注意事项不存在")
    return PrecautionRead.model_validate(precaution)


@router.patch(
    "/precautions/{precaution_id}",
    response_model=PrecautionRead,
    dependencies=[Depends(require_api_permission("precautions:update"))],
)
async def update_precaution(
    study_id: uuid.UUID,
    precaution_id: uuid.UUID,
    precaution_in: PrecautionUpdate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> PrecautionRead:
    await _ensure_study_exists(db, study_id)
    precaution = await precaution_crud.get_precaution(db, precaution_id)
    if not precaution or precaution.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="注意事项不存在")
    await _ensure_site_name_active(db, study_id, precaution.site_name)
    precaution = await precaution_crud.update_precaution(db, precaution, precaution_in)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="precaution",
        entity_id=precaution_id,
        action="UPDATE_PRECAUTION",
        detail=f"注意事项 {precaution_id} 已更新",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )
    return PrecautionRead.model_validate(precaution)


@router.delete(
    "/precautions/{precaution_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(require_api_permission("precautions:delete"))],
)
async def delete_precaution(
    study_id: uuid.UUID,
    precaution_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> None:
    await _ensure_study_exists(db, study_id)
    precaution = await precaution_crud.get_precaution(db, precaution_id)
    if not precaution or precaution.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="注意事项不存在")
    await _ensure_site_name_active(db, study_id, precaution.site_name)
    await precaution_crud.delete_precaution(db, precaution)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="precaution",
        entity_id=precaution_id,
        action="DELETE_PRECAUTION",
        detail=f"注意事项 {precaution_id} 已删除",
        operator_id=current_user.id,
        operator_role=await get_operator_role_label(db, study_id, current_user),
    )