-- Guided tours: curated ordered stops with per-painting text.

CREATE TABLE IF NOT EXISTS tours (
  id SERIAL PRIMARY KEY,
  title VARCHAR(200) NOT NULL,
  description TEXT NOT NULL DEFAULT '',
  status VARCHAR(20) NOT NULL DEFAULT 'draft'
    CHECK (status IN ('draft', 'published')),
  cover_painting_id INTEGER REFERENCES paintings(id) ON DELETE SET NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS tours_status_idx ON tours (status);
CREATE INDEX IF NOT EXISTS tours_updated_at_idx ON tours (updated_at DESC);

CREATE TABLE IF NOT EXISTS tour_stops (
  id SERIAL PRIMARY KEY,
  tour_id INTEGER NOT NULL REFERENCES tours(id) ON DELETE CASCADE,
  painting_id INTEGER NOT NULL REFERENCES paintings(id) ON DELETE CASCADE,
  sort_order INTEGER NOT NULL DEFAULT 0,
  body TEXT NOT NULL DEFAULT '',
  UNIQUE (tour_id, painting_id)
);

CREATE INDEX IF NOT EXISTS tour_stops_tour_idx ON tour_stops (tour_id, sort_order);
CREATE INDEX IF NOT EXISTS tour_stops_painting_idx ON tour_stops (painting_id);

CREATE OR REPLACE FUNCTION tours_touch_updated_at()
RETURNS TRIGGER AS $$
BEGIN
  NEW.updated_at = now();
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS tours_updated_at ON tours;
CREATE TRIGGER tours_updated_at
  BEFORE UPDATE ON tours
  FOR EACH ROW EXECUTE PROCEDURE tours_touch_updated_at();