from app import db


class ReceiverCoverage(db.Model):
    __tablename__ = "receiver_coverages"

    location_mgrs_short = db.Column(db.String(9), primary_key=True)
    date = db.Column(db.Date, primary_key=True)

    max_signal_quality = db.Column(db.Float)
    max_altitude = db.Column(db.Float(precision=2))
    min_altitude = db.Column(db.Float(precision=2))
    aircraft_beacon_count = db.Column(db.Integer)

    device_count = db.Column(db.SmallInteger)

    # Relations
    receiver_id = db.Column(db.Integer, db.ForeignKey("receivers.id", ondelete="SET NULL"), primary_key=True)
    receiver = db.relationship("Receiver", foreign_keys=[receiver_id], backref=db.backref("receiver_coverages", order_by="ReceiverCoverage.date.asc()"))


db.Index("ix_receiver_coverages_date_receiver_id", ReceiverCoverage.date, ReceiverCoverage.receiver_id)
db.Index("ix_receiver_coverages_receiver_id_date", ReceiverCoverage.receiver_id, ReceiverCoverage.date)