from datetime import datetime
from sqlalchemy import String, Integer, ForeignKey, DateTime, func, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column, relationship
from app.core.database import Base


class Watchlist(Base):
    __tablename__ = "watchlist"
    __table_args__ = (UniqueConstraint("user_id", "symbol", name="uq_user_symbol"),)

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), index=True)
    symbol: Mapped[str] = mapped_column(String(20), nullable=False)
    name: Mapped[str] = mapped_column(String(50), nullable=False)
    sort_order: Mapped[int] = mapped_column(Integer, default=0)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    user: Mapped["User"] = relationship(back_populates="watchlist")