from datetime import datetime
from typing import TYPE_CHECKING, List

from sqlalchemy import Boolean, DateTime, ForeignKey, String, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.core.database.models.base import Base

if TYPE_CHECKING:
    from app.core.database.models.approach import ApproachModel
    from app.core.database.models.training import TrainingModel


class ExerciseModel(Base):
    __tablename__ = "exercises"

    id: Mapped[int] = mapped_column(primary_key=True)
    training_id: Mapped[int] = mapped_column(
        ForeignKey("trainings.id", ondelete="CASCADE"), index=True
    )
    name: Mapped[str] = mapped_column(String(255), index=True)
    splitted_weight: Mapped[bool] = mapped_column(Boolean, server_default="false")
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )

    training: Mapped["TrainingModel"] = relationship(back_populates="exercises")
    approaches: Mapped[List["ApproachModel"]] = relationship(
        back_populates="exercise",
        cascade="all, delete-orphan",
        passive_deletes=True,
        order_by="ApproachModel.id",
    )