import type { HttpContext } from '@adonisjs/core/http'
import NzbService from '#services/nzb_service'
import SearchService, { type SortOrder } from '#services/search_service'
import { expandCategories } from '#lib/newznab/index'

const flag = (value: unknown) => value === '1' || value === 'true' || value === true

/** A size in MB from the query string, as bytes. */
function megabytes(value: unknown): number | undefined {
  const mb = Number(value)
  return value !== undefined && value !== '' && Number.isFinite(mb) && mb >= 0 ? Math.round(mb * 1024 * 1024) : undefined
}

/** The catalog for the web interface (REBUILD.md, part 9). */
export default class ReleasesController {
  /** GET /api/v1/releases?q=&cat=5000,2040&readable=1&complete=1&min_size=&max_size=(MB)&source=&poster=&sort=&page=&per_page= */
  async index({ request }: HttpContext) {
    const qs = request.qs()
    const categories = String(qs.cat ?? '')
      .split(',')
      .map((c) => Number(c.trim()))
      .filter((c) => Number.isInteger(c) && c > 0)
    return SearchService.search({
      q: typeof qs.q === 'string' ? qs.q : undefined,
      categories: categories.length ? expandCategories(categories) : undefined,
      readable: flag(qs.readable),
      complete: flag(qs.complete),
      source: typeof qs.source === 'string' && qs.source ? qs.source : undefined,
      poster: typeof qs.poster === 'string' && qs.poster ? qs.poster : undefined,
      minSize: megabytes(qs.min_size),
      maxSize: megabytes(qs.max_size),
      sort: qs.sort as SortOrder | undefined,
      page: Number(qs.page) || 1,
      perPage: Number(qs.per_page) || 50,
      // The page shows "1,000+"; counting further made filter clicks slow.
      countLimit: 1000,
    })
  }

  /** GET /api/v1/releases/:id, with its files */
  async show({ params, response }: HttpContext) {
    const release = await SearchService.release(Number(params.id))
    return release ?? response.notFound({ error: 'Release not found' })
  }

  /** GET /api/v1/releases/:id/nzb */
  async nzb({ params, response }: HttpContext) {
    const nzb = await NzbService.build(Number(params.id))
    if (!nzb) return response.notFound({ error: 'Release not found' })
    const filename = `${nzb.name.replace(/[^\w.\-()[\] ]+/g, '_').slice(0, 180) || 'release'}.nzb`
    response.header('Content-Type', 'application/x-nzb')
    response.header('Content-Disposition', `attachment; filename="${filename}"`)
    return response.send(nzb.xml)
  }

  /** GET /api/v1/stats */
  async stats() {
    return SearchService.stats()
  }
}