'use strict';

const { SlowHttp } = require('../lib/http');
const { fallbackDirection } = require('../../reading-direction');
const parser = require('../plugins/weebcentral');
const { parse } = require('../plugins/registry');
const { sourceDate } = require('../../chapter-dates');

function weebCentralInfo(value) {
  let url;
  try { url = new URL(String(value)); } catch { return null; }
  if (url.protocol !== 'https:' || url.hostname !== 'weebcentral.com') return null;
  const match = /^\/series\/([A-Z0-9]+)(?:\/([^/?#]+))?\/?$/i.exec(url.pathname);
  if (!match) return null;
  const title = decodeURIComponent(match[2] || match[1]).replace(/[-_]+/g, ' ').trim();
  return { source: 'weebcentral', id: match[1].toUpperCase(), title, url: `https://weebcentral.com/series/${match[1]}${match[2] ? `/${match[2]}` : ''}` };
}

const parseChapters = (html, baseUrl) => parser.catalog({ html, url: baseUrl }).chapters;
const parsePageUrls = (html, baseUrl) => parser.pages({ html, url: baseUrl }).pages;

async function discoverWeebCatalog(seriesUrl, http) {
  const seriesHtml = await (await http.get(seriesUrl, { accept: 'text/html' })).text();
  const { title, listUrl } = parse('weebcentral', 'series', { html: seriesHtml, url: seriesUrl });
  const listHtml = listUrl ? await (await http.get(listUrl, { accept: 'text/html', catalog: true })).text() : seriesHtml;
  const parsed = parse('weebcentral', 'catalog', { html: listHtml, url: seriesUrl });
  const chapterLinks = parsed.chapterLinks;
  const chapters = parsed.chapters.sort((a, b) =>
    Number(a.book?.number || 1) - Number(b.book?.number || 1)
    || Number(a.releaseKind === 'volume') - Number(b.releaseKind === 'volume')
    || Number(a.number) - Number(b.number));
  return { title, chapters, chapterLinks,
    ...(chapterLinks && !chapters.length ? { availability: { reason: 'unrecognized-labels',
      message: `WeebCentral lists ${chapterLinks} chapter links, but their numbering labels are not recognized by the parser.` } } : {}),
  };
}

async function discoverWeebChapter(chapter, http) {
  const pageHtml = await (await http.get(chapter.url, { accept: 'text/html' })).text();
  const { manifestUrl } = parse('weebcentral', 'chapter', { html: pageHtml, url: chapter.url });
  const source = sourceDate(chapter.uploadedAt, 'WeebCentral', chapter.uploadBatch);
  const fragment = await (await http.get(`${manifestUrl}&reading_style=long_strip&current_page=1`, { accept: 'text/html' })).text();
  const parsed = parse('weebcentral', 'pages', { html: fragment, url: manifestUrl });
  const pages = parsed.pages.map(url => ({ url, headers: { referer: chapter.url } }));
  if (!pages.length) throw new Error(`No pages found for chapter ${chapter.number}`);
  return {
    number: chapter.number, title: chapter.title || '',
    ...(chapter.special ? { special: true, label: chapter.label, sourceId: chapter.id,
      sourceNumber: chapter.volume, releaseKind: chapter.releaseKind, volume: chapter.volume } : {}),
    ...(chapter.book ? { book: chapter.book } : {}),
    ...(source ? { dates: { source } } : {}),
    source: { name: 'WeebCentral', url: chapter.url }, pages,
  };
}

async function discoverWeebCentral(seriesUrl, options = {}) {
  const http = new SlowHttp(options.http || {});
  const catalog = await discoverWeebCatalog(seriesUrl, http);
  const chapters = catalog.chapters
    .sort((a, b) => Number(b.number) - Number(a.number))
    .slice(0, options.limit || 3)
    .sort((a, b) => Number(a.number) - Number(b.number));
  const output = [];
  for (const chapter of chapters) {
    output.push(await discoverWeebChapter(chapter, http));
  }
  return {
    version: 1,
    series: { title: catalog.title, ...fallbackDirection(), sources: [{ name: 'WeebCentral', url: seriesUrl }], scraper: { ids: { weebcentral: seriesUrl.split('/series/')[1]?.split('/')[0] } } },
    http: options.http || {}, chapters: output,
  };
}

module.exports = { weebCentralInfo, discoverWeebCentral, discoverWeebCatalog, discoverWeebChapter, parseChapters, parsePageUrls };