from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, ARRAY, Index
from sqlalchemy.dialects.postgresql import ENUM
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
import enum

from app.database import Base


class WorldVisibility(enum.Enum):
    PUBLIC = "public"
    PRIVATE = "private"
    FRIENDS_ONLY = "friends_only"


class World(Base):
    __tablename__ = "worlds"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String(255), nullable=False)
    description = Column(Text, nullable=True)
    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    visibility = Column(
        ENUM(WorldVisibility, name="world_visibility", create_type=False),
        default=WorldVisibility.PUBLIC,
    )
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

    # Discovery metadata
    category = Column(String(100), nullable=True, index=True)
    tags = Column(ARRAY(String), nullable=True, server_default="{}")
    play_count = Column(Integer, nullable=False, server_default="0")
    last_played_at = Column(DateTime(timezone=True), nullable=True)

    # GIN index on tags for efficient tag-based queries
    __table_args__ = (
        Index("ix_worlds_tags", "tags", postgresql_using="gin"),
    )

    owner = relationship("User", back_populates="worlds")
    assets = relationship("Asset", back_populates="world", cascade="all, delete-orphan")
    visits = relationship("WorldVisit", back_populates="world", cascade="all, delete-orphan")