CREATE EXTENSION IF NOT EXISTS postgis;

CREATE TABLE IF NOT EXISTS bands (
  id          BIGSERIAL PRIMARY KEY,
  ma_id       BIGINT UNIQUE NOT NULL,
  name        TEXT NOT NULL,
  country     TEXT,
  location_text TEXT,
  status      TEXT,
  genre       TEXT,
  formed_year INT,
  lat         DOUBLE PRECISION,
  lon         DOUBLE PRECISION,
  geom        GEOGRAPHY(Point, 4326),
  data        JSONB NOT NULL DEFAULT '{}'::jsonb,
  created_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at  TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE OR REPLACE FUNCTION bands_set_geom() RETURNS trigger AS $$
BEGIN
  IF NEW.lat IS NOT NULL AND NEW.lon IS NOT NULL THEN
    NEW.geom := ST_SetSRID(ST_MakePoint(NEW.lon, NEW.lat), 4326)::geography;
  ELSE
    NEW.geom := NULL;
  END IF;
  NEW.updated_at := now();
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS trg_bands_set_geom ON bands;
CREATE TRIGGER trg_bands_set_geom
BEFORE INSERT OR UPDATE OF lat, lon ON bands
FOR EACH ROW EXECUTE FUNCTION bands_set_geom();

CREATE INDEX IF NOT EXISTS idx_bands_country ON bands (country);
CREATE INDEX IF NOT EXISTS idx_bands_status  ON bands (status);
CREATE INDEX IF NOT EXISTS idx_bands_genre   ON bands (genre);
CREATE INDEX IF NOT EXISTS idx_bands_geom    ON bands USING GIST (geom);
CREATE INDEX IF NOT EXISTS idx_bands_data_gin ON bands USING GIN (data);