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_roles, require_study_member, require_study_roles
from app.crud import study as study_crud
from app.schemas.study import StudyCreate, StudyRead, StudyUpdate

router = APIRouter()


@router.post("/", response_model=StudyRead, status_code=status.HTTP_201_CREATED, dependencies=[Depends(require_roles(["ADMIN"]))])
async def create_study(
    study_in: StudyCreate,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> StudyRead:
    existing = await study_crud.get_by_code(db, study_in.code)
    if existing:
        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Study code already exists")
    study = await study_crud.create(db, study_in, created_by=current_user.id)
    return study


@router.get("/", response_model=list[StudyRead])
async def list_studies(
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db_session),
    current_user=Depends(get_current_user),
) -> list[StudyRead]:
    if current_user.role == "ADMIN":
        studies = await study_crud.list_studies(db, skip=skip, limit=limit)
    else:
        studies = await study_crud.list_studies_for_user(db, current_user.id, skip=skip, limit=limit)
    return list(studies)


@router.get("/{study_id}", response_model=StudyRead, dependencies=[Depends(require_study_member())])
async def get_study(
    study_id: uuid.UUID,
    db: AsyncSession = Depends(get_db_session),
) -> StudyRead:
    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.patch(
    "/{study_id}",
    response_model=StudyRead,
    dependencies=[Depends(require_study_roles(["PM"]))],
)
async def update_study(
    study_id: uuid.UUID,
    study_in: StudyUpdate,
    db: AsyncSession = Depends(get_db_session),
) -> StudyRead:
    study = await study_crud.get(db, study_id)
    if not study:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Study not found")
    updated = await study_crud.update(db, study, study_in)
    return updated