/** Shipping zones and methods. */

/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
export const up = (pgm) => {
  pgm.sql(`
    CREATE TABLE shipping_zones (
      id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
      name text NOT NULL,
      country text NOT NULL,
      postal_code_prefix text,
      active boolean NOT NULL DEFAULT true,
      created_at timestamptz NOT NULL DEFAULT now(),
      updated_at timestamptz NOT NULL DEFAULT now()
    )
  `);
  pgm.sql('CREATE INDEX shipping_zones_country_idx ON shipping_zones (country, active)');

  pgm.sql(`
    CREATE TABLE shipping_methods (
      id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
      zone_id uuid NOT NULL REFERENCES shipping_zones(id) ON DELETE CASCADE,
      name text NOT NULL,
      base_cost_cents integer NOT NULL,
      free_shipping_threshold_cents integer,
      active boolean NOT NULL DEFAULT true,
      created_at timestamptz NOT NULL DEFAULT now(),
      updated_at timestamptz NOT NULL DEFAULT now(),
      CONSTRAINT shipping_methods_base_cost_non_negative CHECK (base_cost_cents >= 0),
      CONSTRAINT shipping_methods_threshold_non_negative CHECK (free_shipping_threshold_cents IS NULL OR free_shipping_threshold_cents >= 0)
    )
  `);
  pgm.sql('CREATE INDEX shipping_methods_zone_id_idx ON shipping_methods (zone_id)');
};

/** @param {import('node-pg-migrate').MigrationBuilder} pgm */
export const down = (pgm) => {
  pgm.sql('DROP TABLE IF EXISTS shipping_methods');
  pgm.sql('DROP TABLE IF EXISTS shipping_zones');
};