from app import db
from app.utils.time_utils import now_eastern


class FacilityScoreAlert(db.Model):
    """Records each score-trend alert sent for a facility.

    Used by send_score_alerts() to deduplicate cron notifications:
    if an alert row exists for a facility within the last 24 hours,
    no new alert is sent even if the score is still below threshold.
    """
    __tablename__ = 'facility_score_alerts'

    id          = db.Column(db.Integer, primary_key=True)
    facility_id = db.Column(db.Integer, db.ForeignKey('facilities.id', ondelete='CASCADE'), nullable=False)
    sent_at     = db.Column(db.DateTime, nullable=False, default=now_eastern)
    current_avg = db.Column(db.Numeric(5, 2), nullable=False)
    prior_avg   = db.Column(db.Numeric(5, 2), nullable=False)
    delta       = db.Column(db.Numeric(5, 2), nullable=False)

    facility = db.relationship('Facility', foreign_keys=[facility_id])

    def __repr__(self):
        return f'<FacilityScoreAlert facility={self.facility_id} delta={self.delta} sent={self.sent_at}>'