"""Base repository for common database operations."""
from typing import Generic, TypeVar, Type, List, Optional
from sqlalchemy.orm import Session

ModelType = TypeVar("ModelType")


class BaseRepository(Generic[ModelType]):
    """Base repository with common CRUD operations."""

    def __init__(self, model: Type[ModelType], db: Session):
        """Initialize repository with model and database session."""
        self.model = model
        self.db = db

    def get_by_id(self, id: int) -> Optional[ModelType]:
        """Get a single record by ID."""
        return self.db.query(self.model).filter(self.model.id == id).first()

    def get_all(self) -> List[ModelType]:
        """Get all records."""
        return self.db.query(self.model).all()

    def create(self, **kwargs) -> ModelType:
        """Create a new record."""
        db_obj = self.model(**kwargs)
        self.db.add(db_obj)
        self.db.commit()
        self.db.refresh(db_obj)
        return db_obj

    def update(self, id: int, **kwargs) -> Optional[ModelType]:
        """Update a record by ID."""
        db_obj = self.get_by_id(id)
        if db_obj:
            for key, value in kwargs.items():
                setattr(db_obj, key, value)
            self.db.commit()
            self.db.refresh(db_obj)
        return db_obj

    def delete(self, id: int) -> bool:
        """Delete a record by ID."""
        db_obj = self.get_by_id(id)
        if db_obj:
            self.db.delete(db_obj)
            self.db.commit()
            return True
        return False