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

/**
 * Binaries that were flagged conflicted before part_conflicts existed lost
 * their extra articles, so splitting them only reshuffles the first article
 * per part number, a mix of different volumes. Mark them as never to be
 * split, and remove the volumes and files the first splitter run made from
 * them (see LOG.md, 2026-09-28).
 */
export default class extends BaseSchema {
  async up() {
    this.defer(async (db) => {
      await db.rawQuery(`
        WITH boundary AS (
          SELECT migration_time FROM adonis_schema WHERE name LIKE '%1768620764790%'
        ), legacy AS (
          SELECT id FROM binaries
          WHERE conflicted_at IS NOT NULL AND parent_binary_id IS NULL
            AND conflicted_at < (SELECT migration_time FROM boundary)
        ), instances AS (
          SELECT id, file_id FROM binaries WHERE parent_binary_id IN (SELECT id FROM legacy)
        ), deleted_files AS (
          DELETE FROM files WHERE id IN (SELECT file_id FROM instances WHERE file_id IS NOT NULL)
        ), deleted_instances AS (
          DELETE FROM binaries WHERE id IN (SELECT id FROM instances)
        )
        -- 'infinity': last_seen_at > split_at is never true, so SplitService skips them.
        UPDATE binaries SET split_at = 'infinity' WHERE id IN (SELECT id FROM legacy)
      `)
    })
  }

  async down() {
    // The removed volumes were unverifiable; nothing to restore.
  }
}