"""Base repository with generic CRUD operations"""

from typing import TypeVar, Generic, Type, List, Optional, Any
from sqlalchemy.orm import Session
from sqlalchemy import select
from app.db.database import Base as SQLAlchemyBase

T = TypeVar("T", bound=SQLAlchemyBase)


class BaseRepository(Generic[T]):
    """Generic repository for CRUD operations"""

    def __init__(self, session: Session, model: Type[T]):
        self.session = session
        self.model = model

    def create(self, **kwargs) -> T:
        """Create and return new instance"""
        instance = self.model(**kwargs)
        self.session.add(instance)
        self.session.commit()
        self.session.refresh(instance)
        return instance

    def get_by_id(self, id: Any) -> Optional[T]:
        """Get instance by primary key"""
        return self.session.query(self.model).filter(self.model.id == id).first()

    def get_all(self, skip: int = 0, limit: int = 100) -> List[T]:
        """Get all instances with pagination"""
        return (
            self.session.query(self.model)
            .offset(skip)
            .limit(limit)
            .all()
        )

    def update(self, id: Any, **kwargs) -> Optional[T]:
        """Update instance by id"""
        instance = self.get_by_id(id)
        if instance:
            for key, value in kwargs.items():
                setattr(instance, key, value)
            self.session.commit()
            self.session.refresh(instance)
        return instance

    def delete(self, id: Any) -> bool:
        """Delete instance by id"""
        instance = self.get_by_id(id)
        if instance:
            self.session.delete(instance)
            self.session.commit()
            return True
        return False

    def exists(self, **kwargs) -> bool:
        """Check if instance exists with given filters"""
        return self.session.query(self.model).filter_by(**kwargs).first() is not None

    def count(self, **kwargs) -> int:
        """Count instances with given filters"""
        return self.session.query(self.model).filter_by(**kwargs).count()