import uuid
from datetime import datetime, timezone
from sqlmodel import SQLModel, Field


class Zone(SQLModel, table=True):
    __tablename__ = "zones"

    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
    owner_id: uuid.UUID = Field(foreign_key="users.id", index=True)
    activity_id: uuid.UUID = Field(foreign_key="activities.id")
    # Polygon stored as WKT text for SQLite compatibility.
    # For PostgreSQL/PostGIS, a migration can add a GEOMETRY column.
    polygon_wkt: str  # e.g. "POLYGON((lon lat, lon lat, ...))"
    area_m2: float
    defense_level: int = Field(default=1)
    defense_runs: int = Field(default=0)
    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
    last_reinforced_at: datetime | None = None