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 verification as verification_crud
from app.crud import study as study_crud
from app.schemas.verification import VerificationCreate, VerificationRead, VerificationUpdate

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.put(
    "/",
    response_model=VerificationRead,
    status_code=status.HTTP_200_OK,
    dependencies=[Depends(require_study_roles(["PM", "CRA"]))],
)
async def upsert_verification(
    study_id: uuid.UUID,
    payload: VerificationCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> VerificationRead:
    await _ensure_study_exists(db, study_id)
    try:
        vp = await verification_crud.upsert_progress(db, study_id, payload)
    except ValueError as exc:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)) from exc
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="verification",
        entity_id=vp.id,
        action="UPSERT_VERIFICATION",
        detail=f"{payload.level} progress subject {payload.subject_id} upserted",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return VerificationRead.model_validate(vp)


@router.get(
    "/",
    response_model=list[VerificationRead],
    dependencies=[Depends(require_study_member())],
)
async def list_verifications(
    study_id: uuid.UUID,
    site_id: uuid.UUID | None = None,
    subject_id: uuid.UUID | None = None,
    level: str | None = None,
    db: AsyncSession = Depends(get_db_session),
) -> list[VerificationRead]:
    await _ensure_study_exists(db, study_id)
    items = await verification_crud.list_progress(db, study_id, site_id=site_id, subject_id=subject_id, level=level)
    return [VerificationRead.model_validate(i) for i in items]


@router.get(
    "/subjects/{subject_id}/{level}",
    response_model=VerificationRead,
    dependencies=[Depends(require_study_member())],
)
async def get_verification(
    study_id: uuid.UUID,
    subject_id: uuid.UUID,
    level: str,
    db: AsyncSession = Depends(get_db_session),
) -> VerificationRead:
    await _ensure_study_exists(db, study_id)
    vp = await verification_crud.get_progress(db, study_id, subject_id, level)
    if not vp:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Verification not found")
    return VerificationRead.model_validate(vp)


@router.patch(
    "/{verification_id}",
    response_model=VerificationRead,
    dependencies=[Depends(require_study_roles(["PM", "CRA"]))],
)
async def update_verification(
    study_id: uuid.UUID,
    verification_id: uuid.UUID,
    payload: VerificationUpdate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> VerificationRead:
    await _ensure_study_exists(db, study_id)
    vp = await verification_crud.get_by_id(db, verification_id)
    if not vp or vp.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Verification not found")

    updated = await verification_crud.update_progress(db, vp, payload)
    await audit_crud.log_action(
        db,
        study_id=study_id,
        entity_type="verification",
        entity_id=verification_id,
        action="UPSERT_VERIFICATION",
        detail=f"{updated.level} progress subject {updated.subject_id} updated",
        operator_id=current_user.id,
        operator_role=current_user.role,
    )
    return VerificationRead.model_validate(updated)