from sqlalchemy import String, Text, Boolean, Date, Time, Integer, ForeignKey, func
from sqlalchemy.orm import Mapped, mapped_column, relationship
from datetime import datetime, date, time
from typing import Optional
from app.database import Base


class Todo(Base):
    __tablename__ = "todos"

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    user_id: Mapped[int] = mapped_column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    priority: Mapped[str] = mapped_column(String(20), default="medium")
    due_date: Mapped[Optional[date]] = mapped_column(Date, nullable=True)
    due_time: Mapped[Optional[time]] = mapped_column(Time, nullable=True)
    completed: Mapped[bool] = mapped_column(Boolean, default=False)
    completed_at: Mapped[Optional[datetime]] = mapped_column(nullable=True)
    category: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
    recurrence_rule: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
    reset_at: Mapped[Optional[datetime]] = mapped_column(nullable=True, index=True)
    next_due_date: Mapped[Optional[date]] = mapped_column(Date, nullable=True)
    project_id: Mapped[Optional[int]] = mapped_column(Integer, ForeignKey("projects.id", ondelete="SET NULL"), nullable=True)
    created_at: Mapped[datetime] = mapped_column(default=func.now(), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(default=func.now(), onupdate=func.now(), server_default=func.now())

    # Relationships
    project: Mapped[Optional["Project"]] = relationship(back_populates="todos")