from datetime import datetime

from sqlmodel import SQLModel, Field, UniqueConstraint


class ListingDecision(SQLModel, table=True):
    __table_args__ = (
        UniqueConstraint(
            'user_id', 'listing_id', 'listing_type',
            name='uq_decision_user_listing',
        ),
    )

    id: int | None = Field(default=None, primary_key=True)
    user_id: int = Field(nullable=False, foreign_key="user.id", index=True)
    listing_id: int = Field(nullable=False, index=True)
    listing_type: str = Field(nullable=False)  # "RENT" or "BUY"
    decision: str = Field(nullable=False)       # "liked" | "disliked" | "seen"
    # Total price at the time the user marked the listing seen. Only set for
    # decision="seen"; used client-side to resurface listings whose price has
    # changed since the user dismissed them.
    price_at_decision: float | None = Field(default=None, nullable=True)
    created_at: datetime = Field(default_factory=datetime.utcnow)
    updated_at: datetime = Field(default_factory=datetime.utcnow)