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

DATABASE_URL = "sqlite:///./todo.db"
engine = create_engine(DATABASE_URL, connect_args={'check_same_thread': False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

class Task(Base):
    __tablename__ = "tasks"
    id = Column(Integer, primary_key=True, index=True)
    title = Column(String(255), nullable=False)
    description = Column(Text, nullable=True)
    due_date = Column(Date, nullable=True)
    status = Column(Enum('pending', 'completed'), default='pending')

class User(Base):
    __tablename__ = "users"
    id = Column(Integer, primary_key=True, index=True)
    username = Column(String(255), unique=True, nullable=False)
    email = Column(String(255), unique=True, nullable=False)
    password_hash = Column(String(255), nullable=False)

Base.metadata.create_all(bind=engine)