from sqlalchemy import Column, String, Boolean, Float, DateTime, Integer
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from app.db.session import Base


class Device(Base):
    __tablename__ = "devices"

    id = Column(String, primary_key=True, index=True)
    name = Column(String, index=True)
    description = Column(String, nullable=True)
    model = Column(String, default="SIM7000E")
    firmware_version = Column(String, nullable=True)
    
    # Status information
    is_active = Column(Boolean, default=True)
    last_seen = Column(DateTime(timezone=True), nullable=True)
    battery_level = Column(Float, nullable=True)
    signal_strength = Column(Integer, nullable=True)  # RSSI value
    
    # Location information
    latitude = Column(Float, nullable=True)
    longitude = Column(Float, nullable=True)
    altitude = Column(Float, nullable=True)
    
    # Timestamps
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
    
    # Relationships
    telemetry = relationship("Telemetry", back_populates="device", cascade="all, delete-orphan")
    logs = relationship("Log", back_populates="device", cascade="all, delete-orphan")