"""World visit tracking model for discovery analytics.

docs/planning/discovery.md (task b377353b8167).
"""

from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Index
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from app.database import Base


class WorldVisit(Base):
    __tablename__ = "world_visits"

    id = Column(Integer, primary_key=True, index=True)
    world_id = Column(Integer, ForeignKey("worlds.id", ondelete="CASCADE"), nullable=False, index=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True, index=True)
    anonymous_token = Column(String(255), nullable=True)
    visited_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False, index=True)

    __table_args__ = (
        Index("ix_world_visits_world_visited_at", "world_id", "visited_at"),
    )

    world = relationship("World", back_populates="visits")
    user = relationship("User")