import db from '@adonisjs/lucid/services/db'
import { sevenZipVolume } from '#lib/sevenzip/index'

/**
 * The database side of 7z listings (CONCEPT.md D19): which volumes make up
 * an archive. Listing itself (first segment, tail, bsdtar) is
 * lib/sevenzip/list.ts, run by inspection here or on a node.
 */
class SevenZipService {
  /**
   * The volumes of the archive `file` belongs to, in order, when all of them
   * up to the highest number seen are there; null otherwise. An unsplit (or
   * unnamed) archive is its own only volume.
   */
  async volumes(file: any): Promise<any[] | null> {
    const name = String(file.real_name ?? file.filename)
    const volume = sevenZipVolume(name)
    if (!volume) return [file]
    if (!file.release_id) return null
    const base = name.replace(/\.\d+$/, '').toLowerCase()
    const rows = await db
      .from('files')
      .where('release_id', file.release_id)
      .whereRaw(`lower(coalesce(real_name, filename)) LIKE ? ESCAPE '\\'`, [`${base.replace(/[\\%_]/g, '\\$&')}.%`])
    const byNumber = new Map<number, any>()
    for (const row of rows) {
      const n = sevenZipVolume(String(row.real_name ?? row.filename))
      if (n && !byNumber.has(n)) byNumber.set(n, row)
    }
    const max = Math.max(0, ...byNumber.keys())
    const ordered = Array.from({ length: max }, (_, i) => byNumber.get(i + 1))
    return max > 0 && ordered.every(Boolean) ? ordered : null
  }
}

export default new SevenZipService()