/**
 * RIPS 八王子 — http://rips.rinkydink.info/rips/schedule
 *
 * WordPress + My Calendar プラグイン。
 * イベント構造:
 *   <ul class='mc-list'>
 *     <li id='list-YYYY-MM-DD' class='mc-events ...'>
 *       <strong class="event-date">5/1(金)</strong>
 *       <div class='list-event ...'>
 *         <meta itemprop='startDate' content='YYYY-MM-DDTHH:MM:SS' />
 *         <h3 class='event-title summary'>タイトル</h3>
 *         <div class='longdesc description'>
 *           <p>アーティスト1<br/>アーティスト2</p>
 *           <p>OPEN HH:MM START HH:MM<br/>adv:XXXX door:XXXX</p>
 *         </div>
 *       </div>
 *     </li>
 *   </ul>
 *
 * ?yr=YYYY&month=M&dy&cid=... でページネーション
 */
import * as cheerio from "cheerio";
import type { Scraper, VenueMeta } from "./base";
import type { EventInput } from "~/lib/db.server";

export const venue: VenueMeta = {
  id: "rips-hachioji",
  name: "RIPS 八王子",
  url: "http://rips.rinkydink.info/rips",
  area: "八王子",
};

const SCHEDULE_BASE = "http://rips.rinkydink.info/rips/schedule";
const CID = "mc-35df894f2fa16157a96dd95b6cded5c1";

function parseHtml(html: string): EventInput[] {
  const $ = cheerio.load(html);
  const events: EventInput[] = [];

  $("ul.mc-list > li[id^='list-']").each((_, li) => {
    const $li = $(li);
    const dateMatch = $li.attr("id")?.match(/^list-(\d{4}-\d{2}-\d{2})$/);
    if (!dateMatch) return;
    const date = dateMatch[1];

    $li.find("div.list-event").each((_, eventEl) => {
      const $event = $(eventEl);

      const title = $event.find("h3.event-title").text().trim();
      if (!title) return;

      let artist: string | null = null;
      let open_time: string | null = null;
      let start_time: string | null = null;
      let price: string | null = null;
      let image_url: string | null = null;

      const $desc = $event.find("div.longdesc.description");
      if ($desc.length) {
        image_url = $desc.find("img").first().attr("src") ?? null;

        const paragraphs: string[] = [];
        $desc.find("p").each((_, p) => {
          const $p = $(p).clone();
          $p.find("br").replaceWith("\n");
          const text = $p.text().trim();
          if (text) paragraphs.push(text);
        });

        const timeParaIdx = paragraphs.findIndex((p) =>
          /(?:open|pen)\s+\d{1,2}:\d{2}/i.test(p)
        );

        if (timeParaIdx !== -1) {
          const timePara = paragraphs[timeParaIdx];
          const openMatch = timePara.match(/(?:open|pen)\s+(\d{1,2}:\d{2})/i);
          const startMatch = timePara.match(/start\s+(\d{1,2}:\d{2})/i);
          if (openMatch) open_time = openMatch[1];
          if (startMatch) start_time = startMatch[1];

          const priceLines = timePara
            .split("\n")
            .map((l) => l.trim())
            .filter((l) => /adv|door/i.test(l));
          if (priceLines.length) price = priceLines.join(" / ");

          const artistLines = paragraphs
            .filter((_, i) => i !== timeParaIdx)
            .flatMap((p) => p.split("\n").map((l) => l.trim()))
            .filter((l) => l && !/^出演$/.test(l));
          if (artistLines.length) artist = artistLines.join("、");
        } else if (paragraphs.length) {
          const artistLines = paragraphs
            .flatMap((p) => p.split("\n").map((l) => l.trim()))
            .filter((l) => l && !/^出演$/.test(l));
          if (artistLines.length) artist = artistLines.join("、");
        }
      }

      events.push({
        venue_id: venue.id,
        title,
        artist,
        date,
        open_time,
        start_time,
        price,
        image_url,
        ticket_url:
          $event
            .find(
              "a[href*='livepocket'], a[href*='eplus'], a[href*='pia'], a[href*='l-tike'], a[href*='tiget']"
            )
            .first()
            .attr("href") ?? null,
        source_url: SCHEDULE_BASE,
      });
    });
  });

  return events;
}

export const scraper: Scraper = {
  venue,
  async scrape(): Promise<EventInput[]> {
    const now = new Date();
    const urls = [0, 1, 2].map((offset) => {
      const d = new Date(now.getFullYear(), now.getMonth() + offset, 1);
      return `${SCHEDULE_BASE}?yr=${d.getFullYear()}&month=${d.getMonth() + 1}&dy&cid=${CID}`;
    });

    const htmls = await Promise.all(
      urls.map((url) => fetch(url).then((r) => (r.ok ? r.text() : "")))
    );

    const seen = new Set<string>();
    return htmls
      .flatMap(parseHtml)
      .filter((e) => {
        const key = `${e.date}|${e.title}`;
        if (seen.has(key)) return false;
        seen.add(key);
        return true;
      });
  },
};