import { BaseSchema } from '@adonisjs/lucid/schema'

/**
 * When a group's articles were posted, sampled from the news server (ranges:dates; app/services/group_dates.ts), and
 * from those each range's estimated posting date, so ranges can be chosen by era: ranges:capture --from --to marks a
 * posting-time window of every group for the corpus (voyager 3's test data; REBUILD.md, corpus). `stored_at`: the
 * range is complete in the corpus (the prefetcher saw its range.json), so the corpus fill skips it without looking.
 */
export default class extends BaseSchema {
  async up() {
    this.schema.raw(`
      CREATE TABLE IF NOT EXISTS group_dates (
        group_id integer NOT NULL REFERENCES groups (id) ON DELETE CASCADE,
        article bigint NOT NULL,
        posted_at timestamptz NOT NULL,
        PRIMARY KEY (group_id, article)
      )`)
    this.schema.raw(`ALTER TABLE ranges ADD COLUMN IF NOT EXISTS est_date timestamptz`)
    this.schema.raw(`ALTER TABLE ranges ADD COLUMN IF NOT EXISTS stored_at timestamptz`)
  }

  async down() {
    this.schema.raw(`ALTER TABLE ranges DROP COLUMN IF EXISTS stored_at`)
    this.schema.raw(`ALTER TABLE ranges DROP COLUMN IF EXISTS est_date`)
    this.schema.raw(`DROP TABLE IF EXISTS group_dates`)
  }
}