import uuid

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

from app.core.deps import get_current_user, get_db_session, require_study_member, require_study_roles
from app.crud import audit as audit_crud
from app.crud import drug_shipment as shipment_crud
from app.crud import study as study_crud
from app.schemas.drug_shipment import DrugShipmentCreate, DrugShipmentRead, DrugShipmentUpdate

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="Study not found")
    return study


@router.post(
    "/shipments",
    response_model=DrugShipmentRead,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(require_study_roles(["PM", "CRA"]))],
)
async def create_shipment(
    study_id: uuid.UUID,
    shipment_in: DrugShipmentCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> DrugShipmentRead:
    await _ensure_study_exists(db, study_id)
    shipment = await shipment_crud.create_shipment(db, study_id, shipment_in, created_by=current_user.id)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="drug_shipment",
        entity_id=shipment.id,
        action="CREATE_DRUG_SHIPMENT",
        detail=f"Drug shipment {shipment.id} created",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return DrugShipmentRead.model_validate(shipment)


@router.get(
    "/shipments",
    response_model=list[DrugShipmentRead],
    dependencies=[Depends(require_study_member())],
)
async def list_shipments(
    study_id: uuid.UUID,
    site_name: str | None = None,
    tracking_no: str | None = None,
    status: str | None = None,
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db_session),
) -> list[DrugShipmentRead]:
    await _ensure_study_exists(db, study_id)
    items = await shipment_crud.list_shipments(
        db, study_id, site_name=site_name, tracking_no=tracking_no, status=status, skip=skip, limit=limit
    )
    return [DrugShipmentRead.model_validate(item) for item in items]


@router.get(
    "/shipments/{shipment_id}",
    response_model=DrugShipmentRead,
    dependencies=[Depends(require_study_member())],
)
async def get_shipment(
    study_id: uuid.UUID,
    shipment_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
) -> DrugShipmentRead:
    await _ensure_study_exists(db, study_id)
    shipment = await shipment_crud.get_shipment(db, shipment_id)
    if not shipment or shipment.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Shipment not found")
    return DrugShipmentRead.model_validate(shipment)


@router.patch(
    "/shipments/{shipment_id}",
    response_model=DrugShipmentRead,
    dependencies=[Depends(require_study_roles(["PM", "CRA"]))],
)
async def update_shipment(
    study_id: uuid.UUID,
    shipment_id: uuid.UUID,
    shipment_in: DrugShipmentUpdate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> DrugShipmentRead:
    await _ensure_study_exists(db, study_id)
    shipment = await shipment_crud.get_shipment(db, shipment_id)
    if not shipment or shipment.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Shipment not found")
    shipment = await shipment_crud.update_shipment(db, shipment, shipment_in)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="drug_shipment",
        entity_id=shipment_id,
        action="UPDATE_DRUG_SHIPMENT",
        detail=f"Drug shipment {shipment_id} updated",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return DrugShipmentRead.model_validate(shipment)


@router.delete(
    "/shipments/{shipment_id}",
    status_code=status.HTTP_204_NO_CONTENT,
    dependencies=[Depends(require_study_roles(["PM", "CRA"]))],
)
async def delete_shipment(
    study_id: uuid.UUID,
    shipment_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> None:
    await _ensure_study_exists(db, study_id)
    shipment = await shipment_crud.get_shipment(db, shipment_id)
    if not shipment or shipment.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Shipment not found")
    await shipment_crud.delete_shipment(db, shipment)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="drug_shipment",
        entity_id=shipment_id,
        action="DELETE_DRUG_SHIPMENT",
        detail=f"Drug shipment {shipment_id} deleted",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )