/**
 * duo MUSIC EXCHANGE — https://duomusicexchange.com
 *
 * 月別HTML: /schedule/YYYY/index_YYYY-MM.html
 * DOM構造:
 *   <section id="daybox">
 *     <div class="date"><span class="day">01</span></div>
 *     <div class="sche-details">
 *       <span class="artist">アーティスト名</span>
 *       <span class="details-title">イベントタイトル</span>
 *       <dl class="row">
 *         <dt>OPEN/START</dt><dd>18:00 / 19:00</dd>
 *         <dt>ADV./DOOR</dt><dd>¥3,000 / ¥3,500</dd>
 *         <dt>Ticket.</dt><dd><a href="...">...</a></dd>
 *       </dl>
 *     </div>
 *   </section>
 */
import * as cheerio from "cheerio";
import type { Scraper, VenueMeta } from "./base";
import type { EventInput } from "~/lib/db.server";

export const venue: VenueMeta = {
  id: "duo-music-exchange",
  name: "duo MUSIC EXCHANGE",
  url: "https://duomusicexchange.com",
  area: "渋谷",
  capacity: 700,
};

async function scrapeMonth(year: number, month: number): Promise<EventInput[]> {
  const mm = String(month).padStart(2, "0");
  const url = `${venue.url}/schedule/${year}/index_${year}-${mm}.html`;
  const res = await fetch(url);
  if (!res.ok) return [];
  const $ = cheerio.load(await res.text());
  const events: EventInput[] = [];

  $("section#daybox").each((_, el) => {
    const $el = $(el);

    const dayStr = $el.find(".date .day").first().text().trim();
    const day = parseInt(dayStr, 10);
    if (!day) return;
    const date = `${year}-${mm}-${String(day).padStart(2, "0")}`;

    const artist = $el.find(".sche-details .artist").first().text().trim() || null;
    const title = $el.find(".sche-details .details-title").first().text().trim();
    if (!title) return;

    let openTime: string | null = null;
    let startTime: string | null = null;
    let price: string | null = null;
    let ticketUrl: string | null = null;

    $el.find("dl.row dt").each((_, dt) => {
      const label = $(dt).text().trim();
      const $dd = $(dt).next("dd");
      if (/OPEN/i.test(label)) {
        const times = $dd.text().trim().match(/(\d{1,2}:\d{2})/g) ?? [];
        openTime = times[0] ?? null;
        startTime = times[1] ?? null;
      } else if (/ADV/i.test(label)) {
        price = $dd.text().trim() || null;
      } else if (/Ticket/i.test(label)) {
        ticketUrl = $dd.find("a[href]").first().attr("href") ?? null;
      }
    });

    const imgSrc = $el.find("img").first().attr("src") ?? null;
    const imageUrl = imgSrc
      ? (imgSrc.startsWith("http") ? imgSrc : `${venue.url}/schedule/${year}/${imgSrc}`)
      : null;

    events.push({
      venue_id: venue.id,
      title,
      artist,
      date,
      open_time: openTime,
      start_time: startTime,
      price,
      ticket_url: ticketUrl,
      image_url: imageUrl,
      source_url: url,
    });
  });

  return events;
}

export const scraper: Scraper = {
  venue,
  async scrape(): Promise<EventInput[]> {
    const now = new Date();
    const months = [0, 1, 2].map((offset) => {
      const d = new Date(now.getFullYear(), now.getMonth() + offset, 1);
      return { year: d.getFullYear(), month: d.getMonth() + 1 };
    });
    const results = await Promise.all(months.map(({ year, month }) => scrapeMonth(year, month)));
    return results.flat();
  },
};