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

/**
 * Candidates the prober may claim (Prober.claim): `ready` once their release
 * settled (the settler sets it), `unreadable` when that release had no
 * readable name then. The claims joined releases for both and started at
 * random points of the queue; in its newer half nothing had settled, so a
 * slice scanned to the end (0.3 s a slice, 20 slices, 5 tiers: the prober
 * stood still for minutes per claim; LOG.md 2026-10-12 (20)). With an index
 * over the claimable rows only.
 */
export default class extends BaseSchema {
  static disableTransactions = true

  async up() {
    this.schema.raw(`ALTER TABLE probe_candidates ADD COLUMN IF NOT EXISTS ready boolean NOT NULL DEFAULT false`)
    this.schema.raw(`ALTER TABLE probe_candidates ADD COLUMN IF NOT EXISTS unreadable boolean NOT NULL DEFAULT false`)
    this.schema.raw(
      `UPDATE probe_candidates pc SET ready = true, unreadable = NOT r.readable FROM releases r
       WHERE r.id = pc.release_id AND r.settled_at IS NOT NULL AND NOT pc.ready`
    )
    this.schema.raw(`CREATE INDEX CONCURRENTLY IF NOT EXISTS probe_candidates_ready_idx ON probe_candidates (kind, unreadable, id) WHERE status = 'waiting' AND ready`)
    this.schema.raw(`DROP INDEX CONCURRENTLY IF EXISTS probe_candidates_kind_waiting_idx`)
  }

  async down() {
    this.schema.raw(`DROP INDEX CONCURRENTLY IF EXISTS probe_candidates_ready_idx`)
    this.schema.raw(`ALTER TABLE probe_candidates DROP COLUMN IF EXISTS ready, DROP COLUMN IF EXISTS unreadable`)
  }
}