from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from .database import Base


class User(Base):
    """
    User model for authentication and authorization
    """
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    email = Column(String, unique=True, index=True, nullable=False)
    username = Column(String, unique=True, index=True, nullable=False)
    hashed_password = Column(String, nullable=False)
    is_active = Column(Boolean, default=True)
    is_superuser = Column(Boolean, default=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

    todos = relationship("Todo", back_populates="owner", cascade="all, delete-orphan")


class Todo(Base):
    """
    Todo model representing a task to be done
    """
    __tablename__ = "todos"

    id = Column(Integer, primary_key=True, index=True)
    title = Column(String, nullable=False)
    description = Column(String, nullable=True)
    completed = Column(Boolean, default=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

    # Add relationship to User
    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    owner = relationship("User", back_populates="todos")