from sqlalchemy import create_engine, Column, Integer, String, Text, Enum, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from datetime import datetime

DATABASE_URL = "sqlite:///./todos.db"
engine = create_engine(DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

class TodoStatus(Enum):
    completed = 'completed'
    pending = 'pending'

class Todo(Base):
    __tablename__ = "todos"
    id = Column(Integer, primary_key=True, index=True)
    title = Column(String(255), nullable=False)
    description = Column(Text, nullable=True)
    status = Column(Enum(TodoStatus), default=TodoStatus.pending)
    created_at = Column(DateTime, default=datetime.utcnow)

Base.metadata.create_all(bind=engine)