'use strict';

const normalize = value => String(value || '').normalize('NFKD').toLowerCase().replace(/[^a-z0-9]+/g, '');

function seriesLink(value) {
  let url;
  try { url = new URL(String(value || '')); } catch { return null; }
  if (url.protocol !== 'https:') return null;
  const weeb = /^\/series\/([A-Z0-9]{26})(?:\/[^/?#]+)?\/?$/i.exec(url.pathname);
  if (url.hostname === 'weebcentral.com' && weeb) return {
    source: 'weebcentral', label: 'WeebCentral', seriesId: weeb[1].toUpperCase(),
    url: `https://weebcentral.com${url.pathname.replace(/\/$/, '')}`,
  };
  const dex = /^\/title\/([0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12})(?:\/[^/?#]+)?\/?$/i.exec(url.pathname);
  if (['mangadex.org', 'www.mangadex.org'].includes(url.hostname) && dex) return {
    source: 'mangadex', label: 'MangaDex', seriesId: dex[1].toLowerCase(),
    url: `https://mangadex.org/title/${dex[1].toLowerCase()}`,
  };
  return null;
}

const keyOf = link => `${link.source}:${link.seriesId}`;

function hosterLinks(entry, owned, queue = []) {
  const names = new Set([entry.title, ...(entry.aliases || [])].map(normalize));
  const known = new Map();
  for (const source of owned?.meta?.sources || []) {
    const link = seriesLink(source.url);
    if (link) known.set(keyOf(link), { ...link, origin: 'library' });
  }
  const jobs = [];
  for (const item of queue) {
    const link = seriesLink(item.url);
    if (!link) continue;
    if (item.libraryMangaId && owned && item.libraryMangaId !== owned.id) continue;
    if (!(owned && item.libraryMangaId === owned.id) && !names.has(normalize(item.title)) && !known.has(keyOf(link))) continue;
    if (!known.has(keyOf(link))) known.set(keyOf(link), { ...link, origin: 'queue title match' });
    jobs.push({ id: item.id, source: link.source, seriesId: link.seriesId, kind: item.kind, status: item.status });
  }
  return { links: [...known.values()], jobs };
}

module.exports = { seriesLink, hosterLinks };