from datetime import datetime
from sqlalchemy import DateTime, String, ForeignKey, Index
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


class Event(Base):
    __tablename__ = "events"

    id: Mapped[int] = mapped_column(primary_key=True)
    vehicle_id: Mapped[int] = mapped_column(ForeignKey("vehicles.id", ondelete="CASCADE"))
    timestamp: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=datetime.utcnow)
    type: Mapped[str] = mapped_column(String(50), nullable=False)  # LONG_STOP, OVERSPEED, CONNECTION_LOST
    payload: Mapped[dict] = mapped_column(JSONB, default=dict)

    # Relationships
    vehicle: Mapped["Vehicle"] = relationship(back_populates="events")

    __table_args__ = (
        Index("idx_events_vehicle_ts", "vehicle_id", "timestamp"),
        Index("idx_events_type", "type"),
    )