from sqlalchemy import Column, Integer, String, Float, DateTime, JSON
from sqlalchemy.sql import func
from app.core.database import Base


class MeterReading(Base):
    """电表读数时序数据"""
    __tablename__ = "meter_readings"

    time = Column(DateTime(timezone=True), primary_key=True, nullable=False)
    meter_id = Column(Integer, primary_key=True, nullable=False)
    meter_name = Column(String(100))
    forward_active_energy = Column(Float)   # 正向有功电能 kWh
    reverse_active_energy = Column(Float)   # 反向有功电能 kWh
    active_power = Column(Float)            # 有功功率 kW
    reactive_power = Column(Float)          # 无功功率 kvar
    power_factor = Column(Float)            # 功率因数
    voltage_a = Column(Float)               # A相电压 V
    voltage_b = Column(Float)               # B相电压 V
    voltage_c = Column(Float)               # C相电压 V
    current_a = Column(Float)               # A相电流 A
    current_b = Column(Float)               # B相电流 A
    current_c = Column(Float)               # C相电流 A
    raw_json = Column(JSON)                 # 原始数据包