"""WorkoutDay model for the 4-day training split.

Defines the named workout days and their order.
"""

from typing import Optional

from sqlmodel import Field, SQLModel


class WorkoutDay(SQLModel, table=True):
    """A named workout day in the training program.

    Attributes:
        id: Primary key, auto-incremented.
        name: Day name (Push, Pull, Lower, Full Body).
        day_number: Order in the weekly rotation (1-4).
        description: Brief description of the day's focus.
    """

    __tablename__ = "workout_days"

    id: Optional[int] = Field(default=None, primary_key=True)
    name: str = Field(index=True, unique=True)
    day_number: int = Field(unique=True)
    description: str = Field(default="")