import uuid

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

from app.core.deps import get_db_session, require_study_member, require_study_roles
from app.crud import site as site_crud
from app.crud import study as study_crud
from app.schemas.site import SiteCreate, SiteRead, SiteUpdate

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(
    "/",
    response_model=SiteRead,
    status_code=status.HTTP_201_CREATED,
    dependencies=[Depends(require_study_roles(["PM"]))],
)
async def create_site(
    study_id: uuid.UUID,
    site_in: SiteCreate,
    db: AsyncSession = Depends(get_db_session),
) -> SiteRead:
    await _ensure_study_exists(db, study_id)
    site = await site_crud.create_site(db, study_id, site_in)
    return site


@router.get(
    "/",
    response_model=list[SiteRead],
    dependencies=[Depends(require_study_member())],
)
async def list_sites(
    study_id: uuid.UUID,
    skip: int = 0,
    limit: int = 100,
    db: AsyncSession = Depends(get_db_session),
) -> list[SiteRead]:
    await _ensure_study_exists(db, study_id)
    sites = await site_crud.list_by_study(db, study_id, skip=skip, limit=limit)
    return list(sites)


@router.patch(
    "/{site_id}",
    response_model=SiteRead,
    dependencies=[Depends(require_study_roles(["PM"]))],
)
async def update_site(
    study_id: uuid.UUID,
    site_id: uuid.UUID,
    site_in: SiteUpdate,
    db: AsyncSession = Depends(get_db_session),
) -> SiteRead:
    await _ensure_study_exists(db, study_id)
    site = await site_crud.get_site(db, site_id)
    if not site or site.study_id != study_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Site not found")
    updated = await site_crud.update_site(db, site, site_in)
    return updated