"""Geocoding reference tables.

ZipGeo: offline US ZIP -> lat/lng/city/state/metro (source the full ~42k-row
dataset from SimpleMaps US ZIP or Census ZCTA; a small sample is seeded for tests).
Metro: SEO landing-page anchor (pages built in Phase 7; column wired now).
"""
from app.extensions import db


class ZipGeo(db.Model):
    __tablename__ = "zip_geo"

    zip = db.Column(db.String(12), primary_key=True)
    city = db.Column(db.String(80), nullable=False)
    state = db.Column(db.String(2), nullable=False, index=True)
    lat = db.Column(db.Float, nullable=False)
    lng = db.Column(db.Float, nullable=False)
    metro = db.Column(db.String(80), nullable=True, index=True)

    def __repr__(self):
        return f"<ZipGeo {self.zip} {self.city},{self.state}>"


class Metro(db.Model):
    __tablename__ = "metros"

    id = db.Column(db.BigInteger().with_variant(db.Integer, "sqlite"),
                   primary_key=True, autoincrement=True)
    slug = db.Column(db.String(80), unique=True, nullable=False, index=True)
    name = db.Column(db.String(120), nullable=False)
    state = db.Column(db.String(2), nullable=True)
    center_lat = db.Column(db.Float, nullable=True)
    center_lng = db.Column(db.Float, nullable=True)

    def __repr__(self):
        return f"<Metro {self.slug}>"