/**
 * 東高円寺二万電圧 — https://den-atsu.com
 *
 * WordPress カスタムテーマ。月別スケジュールページ構造:
 *   <p class="p1">■YYYY.M/D(day)</p>          ← 日付マーカー
 *   <p class="p1"><span style="color:red">タイトル</span></p>  ← タイトル (複数行あり)
 *   <p class="p1">アーティスト名</p>            ← 出演者 (複数行あり)
 *   <p class="p1">open.HH:MM start.HH:MM\nadv.Nyen door.Nyen\n<a>チケット</a></p>
 *   <p>&nbsp;</p>                               ← イベント区切り
 */
import * as cheerio from "cheerio";
import type { Scraper, VenueMeta } from "./base";
import type { EventInput } from "~/lib/db.server";

export const venue: VenueMeta = {
  id: "den-atsu",
  name: "東高円寺二万電圧",
  url: "https://den-atsu.com",
  area: "東高円寺",
  capacity: 130,
};

const TICKET_LINK_SELECTOR =
  'a[href*="eplus"], a[href*="livepocket"], a[href*="tiget"], a[href*="pia.jp"], a[href*="ticket"]';

function parseHtml(html: string, year: number, month: number): EventInput[] {
  const $ = cheerio.load(html);
  const events: EventInput[] = [];
  const sourceUrl = `https://den-atsu.com/schedule/${year}-${month}-schedule/`;

  // Collect all <p> elements under the content section
  const paras = $("div.inner p").toArray();

  let i = 0;
  while (i < paras.length) {
    const $p = $(paras[i]);
    const text = $p.text().trim();

    // Date marker: ■YYYY.M/D(day)
    const dateMatch = text.match(/^■(\d{4})\.(\d{1,2})\/(\d{1,2})/);
    if (!dateMatch) {
      i++;
      continue;
    }
    const date = `${dateMatch[1]}-${dateMatch[2].padStart(2, "0")}-${dateMatch[3].padStart(2, "0")}`;
    i++;

    // Title: consecutive p.p1 containing red-colored spans
    const titleParts: string[] = [];
    while (i < paras.length) {
      const $cur = $(paras[i]);
      if ($cur.find("span[style*='color']").length === 0) break;
      const part = $cur.text().trim();
      if (part) titleParts.push(part);
      i++;
    }
    const title = titleParts.join(" ").trim();
    if (!title) continue;

    // Artists: p.p1 or plain p without red spans, not time/price lines
    const artistParts: string[] = [];
    while (i < paras.length) {
      const $cur = $(paras[i]);
      const t = $cur.text().trim();
      if (!t || t === " ") { i++; break; }  // blank separator → done
      if (t.match(/^■\d{4}/)) break;             // next event
      if ($cur.find("span[style*='color']").length > 0) break;
      if (t.match(/^open\./i) || t.match(/^adv\./i)) break;
      artistParts.push(t);
      i++;
    }
    const artist = artistParts.join("、").trim() || null;

    // Info line: open/start times, adv/door prices, ticket link
    let openTime: string | null = null;
    let startTime: string | null = null;
    let price: string | null = null;
    let ticketUrl: string | null = null;

    while (i < paras.length) {
      const $cur = $(paras[i]);
      const t = $cur.text().trim();
      if (!t || t === " ") { i++; break; }
      if (t.match(/^■\d{4}/)) break;

      const openMatch = t.match(/open\.(\d{1,2}:\d{2})/i);
      const startMatch = t.match(/start\.(\d{1,2}:\d{2})/i);
      const advMatch = t.match(/adv\.([\d,]+)yen/i);
      const doorMatch = t.match(/door\.([\d,]+)yen/i);

      if (openMatch) openTime = openMatch[1];
      if (startMatch) startTime = startMatch[1];

      if (advMatch && doorMatch) {
        price = `前売 ¥${advMatch[1]} / 当日 ¥${doorMatch[1]}`;
      } else if (advMatch) {
        price = `前売 ¥${advMatch[1]}`;
      }

      if (!ticketUrl) {
        ticketUrl = $cur.find(TICKET_LINK_SELECTOR).first().attr("href") ?? null;
      }
      i++;
    }

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

  return events;
}

export const scraper: Scraper = {
  venue,
  async scrape(): Promise<EventInput[]> {
    const now = new Date();
    const targets = [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(
      targets.map(async ({ year, month }) => {
        const url = `https://den-atsu.com/schedule/${year}-${month}-schedule/`;
        const res = await fetch(url);
        if (!res.ok) return [];
        return parseHtml(await res.text(), year, month);
      })
    );

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