import db from '@adonisjs/lucid/services/db'
import logger from '@adonisjs/core/services/logger'
import coordinatorConfig from '#config/coordinator'

/** How often the catalog's size is measured (pg_tablespace_size walks its files). */
const CHECK_MS = 60_000

/**
 * The catalog's room on the NVMe (CATALOG_MAX_NVME_GB, like voyager 1's
 * BACKFILL_MAX_NVME_GB): once its tablespace (the database's
 * default_tablespace) is over the cap, only the tail and the stored ranges
 * (priority below 0) are leased and prefetched, and history waits. After
 * reset 24 the catalog grew ~3.7 GB an hour, root down to 31 GB free with
 * 600k history ranges to go (LOG.md 2026-10-14 (53)). Off when unset.
 */
class CatalogSpace {
  private checkedAt = 0
  private over = false

  async full(): Promise<boolean> {
    const cap = coordinatorConfig.catalogMaxNvmeGb
    if (!cap) return false
    if (Date.now() - this.checkedAt < CHECK_MS) return this.over
    this.checkedAt = Date.now()
    const { rows } = await db.rawQuery(
      `SELECT pg_tablespace_size(coalesce(nullif(current_setting('default_tablespace'), ''), 'pg_default')) AS bytes`
    )
    const bytes = Number(rows[0].bytes)
    const was = this.over
    this.over = bytes > cap * 1e9
    if (this.over !== was) {
      logger.info(`Catalog ${(bytes / 1e9).toFixed(1)} GB of ${cap}: history ${this.over ? 'paused (tail and stored ranges only)' : 'resumed'}.`)
    }
    return this.over
  }
}

export default new CatalogSpace()