from sqlalchemy.orm import Session
from sqlalchemy.exc import IntegrityError
from fastapi import HTTPException, status
from typing import Optional
from . import repository
from .schema import InsuranceproviderCreate, InsuranceproviderUpdate


def create_insuranceprovider(db: Session, data: InsuranceproviderCreate):
    try:
        obj = repository.create(db, data.model_dump())
        db.commit()
        db.refresh(obj)
        return obj
    except IntegrityError as exc:
        db.rollback()
        msg = str(exc.orig).lower() if exc.orig else ""
        if "unique" in msg or "duplicate" in msg:
            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Insurance provider with this name already exists.")
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Data integrity error.")
    except HTTPException:
        db.rollback()
        raise
    except Exception:
        db.rollback()
        raise


def get_insuranceprovider_by_id(db: Session, entity_id: str):
    obj = repository.get_by_id(db, entity_id)
    if not obj:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Insurance provider not found.")
    return obj


def list_insuranceproviders(db: Session, limit: int, offset: int, search: Optional[str] = None) -> dict:
    items = repository.list_all(db, limit=limit, offset=offset, search=search)
    total = repository.count_all(db, search=search)
    return {"items": items, "total": total, "limit": limit, "offset": offset}


def update_insuranceprovider(db: Session, entity_id: str, data: InsuranceproviderUpdate):
    update_data = data.model_dump(exclude_unset=True)
    if not update_data:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="No fields to update.")
    try:
        obj = repository.update(db, entity_id, update_data)
        if not obj:
            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Insurance provider not found.")
        db.commit()
        db.refresh(obj)
        return obj
    except IntegrityError as exc:
        db.rollback()
        msg = str(exc.orig).lower() if exc.orig else ""
        if "unique" in msg or "duplicate" in msg:
            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Insurance provider with this name already exists.")
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Data integrity error.")
    except HTTPException:
        db.rollback()
        raise
    except Exception:
        db.rollback()
        raise


def delete_insuranceprovider(db: Session, entity_id: str):
    try:
        success = repository.delete(db, entity_id)
        if not success:
            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Insurance provider not found.")
        db.commit()
        return {"detail": "Insurance provider deleted successfully."}
    except IntegrityError as exc:
        db.rollback()
        msg = str(exc.orig).lower() if exc.orig else ""
        if "foreign key" in msg:
            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Cannot delete insurance provider as it is referenced by existing patients.")
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Data integrity error.")
    except HTTPException:
        db.rollback()
        raise
    except Exception:
        db.rollback()
        raise