src/domain/training/planned_session.py

from typing import Literal, Optional
from pydantic import BaseModel, Field
from datetime import datetime, date
import uuid


class PlannedSession(BaseModel):
    """
    Represents a planned running session for a specific week.
    Goal-informed and editable.
    """

    id: uuid.UUID = Field(default_factory=uuid.uuid4)
    runner_id: uuid.UUID
    week_start_date: date
    session_type: Literal["weekday", "long_run"]
    planned_date: date
    target_distance_km: float
    completed_run_id: Optional[str] = None
    created_at: datetime = Field(default_factory=datetime.now)

    class Config:
        frozen = False  # Allow mutation for completed_run_id