from sqlalchemy import String, Boolean, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship
from app.models.base import Base, TimestampMixin


class Subject(TimestampMixin, Base):
    __tablename__ = "subjects"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    color: Mapped[str] = mapped_column(String(7), default="#10B981")  # hex color
    icon: Mapped[str] = mapped_column(String(10), default="📚")       # emoji
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)

    user: Mapped["User"] = relationship("User", back_populates="subjects")  # noqa: F821
    schedule_blocks: Mapped[list["ScheduleBlock"]] = relationship(  # noqa: F821
        "ScheduleBlock", back_populates="subject"
    )
    activity_logs: Mapped[list["ActivityLog"]] = relationship(  # noqa: F821
        "ActivityLog", back_populates="subject"
    )