import db from '@adonisjs/lucid/services/db'

/** Releases unchanged for this long are settled (ranges are read in order; the merger adds within minutes). */
const QUIET_HOURS = 6
/**
 * History: a release whose last post is QUIET_HOURS old gets nothing new from the tail, only from the
 * neighbouring ranges' fragments, which the merger adds within minutes: settled once unchanged this long.
 * Waiting QUIET_HOURS after it was read held every history release back from phase 2 for six hours after
 * each reset (the hourly sweeps' resets kept the prober idle; LOG.md 2026-10-12 (13)).
 */
const QUIET_HISTORY_MINUTES = 30
const BATCH = 50_000

/**
 * Settles releases (REBUILD.md, part 8): once nothing has been added for
 * QUIET_HOURS (QUIET_HISTORY_MINUTES once its last post is that old), its completeness is decided: complete when every file the
 * [i/N] counter announced was found, unknown without a counter (phase 2
 * reads par2 sets for those). Phase 2 picks its work from settled releases.
 */
class Settler {
  async run(): Promise<number> {
    let settled = 0
    while (true) {
      const { rowCount } = await db.rawQuery(
        `UPDATE releases SET settled_at = now(), complete = CASE WHEN file_total IS NULL THEN NULL ELSE files >= file_total END
         WHERE id IN (SELECT id FROM releases WHERE settled_at IS NULL AND last_seen_at < now() - make_interval(mins => ?)
           AND (last_seen_at < now() - make_interval(hours => ?) OR coalesce(last_posted_at, posted_at) < now() - make_interval(hours => ?)) LIMIT ?)`,
        [QUIET_HISTORY_MINUTES, QUIET_HOURS, QUIET_HOURS, BATCH]
      )
      settled += rowCount ?? 0
      if ((rowCount ?? 0) < BATCH) return settled
    }
  }
}

export default new Settler()