import { BaseCommand } from '@adonisjs/core/ace'
import { CommandOptions } from '@adonisjs/core/types/ace'
import db from '@adonisjs/lucid/services/db'

const BATCH = 50_000

/**
 * One-off (LOG.md 2026-10-08 (14)): copies the content types and archive
 * listings still on `files` into file_details, a partition at a time.
 * Values written since the deploy (by the new code, into file_details) win:
 * a file that has details already is skipped.
 */
export default class FilesMoveDetails extends BaseCommand {
  public static commandName = 'files:move-details'
  public static description = "Copies files' content types and archive listings into file_details."

  public static options: CommandOptions = {
    startApp: true,
  }

  public async run() {
    const { rows: partitions } = await db.rawQuery(
      `SELECT c.relname FROM pg_inherits i JOIN pg_class c ON c.oid = i.inhrelid WHERE i.inhparent = 'files'::regclass ORDER BY c.relname`
    )
    let total = 0
    for (const { relname } of partitions) {
      const started = Date.now()
      const { rows } = await db.rawQuery(`SELECT min(id) AS lo, max(id) AS hi FROM ${relname}`)
      if (rows[0].lo === null) continue
      let copied = 0
      // Short statements in id order: one statement over a whole partition took 30 minutes, and the
      // garbage filter deleted files meanwhile, which failed the foreign key (LOG.md 2026-10-08 (15)).
      for (let lo = Number(rows[0].lo); lo <= Number(rows[0].hi); lo += BATCH) {
        for (let attempt = 1; ; attempt++) {
          try {
            const result = await db.rawQuery(
              `INSERT INTO file_details (file_id, content_type, archive)
               SELECT id, content_type, archive FROM ${relname}
               WHERE id >= ? AND id < ? AND (content_type IS NOT NULL OR archive IS NOT NULL)
               ON CONFLICT (file_id) DO NOTHING`,
              [lo, lo + BATCH]
            )
            copied += result.rowCount ?? 0
            break
          } catch (error: any) {
            // A file deleted while this batch ran: the batch again, without it.
            if (error.code !== '23503' || attempt >= 5) throw error
          }
        }
      }
      total += copied
      this.logger.info(`${relname}: ${copied} copied in ${Math.round((Date.now() - started) / 1000)} s.`)
    }
    this.logger.info(`${total} files' details copied.`)
  }
}