QCoder AC Problem List Highlighter

QCoderの問題一覧でAC済み問題を緑色にする
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// ==UserScript==
// @name         QCoder AC Problem List Highlighter
// @namespace    https://qcoder.jp/
// @version      1.0.0
// @description  QCoderの問題一覧でAC済み問題を緑色にする
// @match        https://qcoder.jp/*
// @match        https://www.qcoder.jp/*
// @grant        none
// @license      MIT
// ==/UserScript==

(() => {
  'use strict';

  const m = location.pathname.match(/\/(?:ja|en)\/contests\/([^/]+)/);
  if (!m) return;

  const contestId = m[1];
  const isProblemList =
    /^\/(?:ja|en)\/contests\/[^/]+\/?$/.test(location.pathname);

  if (!isProblemList) return;

  const GREEN = '#dff6dd';
  const BORDER = '#2eaf4a';

  const norm = s => (s || '').replace(/\s+/g, ' ').trim();

  async function fetchAcceptedLabels() {
    const res = await fetch(`/api/contests/${contestId}/submissions/me`, {
      credentials: 'include',
    });

    if (!res.ok) return new Set();

    const submissions = await res.json();

    return new Set(
      submissions
        .filter(s => s.submissionStatusCode === 'AC')
        .map(s => s.problemLabel)
    );
  }

  function getProblemLabelFromRow(tr) {
    const firstCell = tr.querySelector('td');
    if (!firstCell) return null;

    const text = norm(firstCell.innerText || firstCell.textContent);
    const m = text.match(/^([A-Z]+\d+)/);
    return m ? m[1] : null;
  }

  function paint(acLabels) {
    document.querySelectorAll('tr').forEach(tr => {
      const label = getProblemLabelFromRow(tr);
      if (!label || !acLabels.has(label)) return;

      tr.style.backgroundColor = GREEN;
      tr.style.borderLeft = `8px solid ${BORDER}`;

      const a = tr.querySelector('a');
      if (a && !tr.querySelector('.qcoder-ac-badge')) {
        a.insertAdjacentHTML(
          'afterend',
          `<span class="qcoder-ac-badge" style="margin-left:8px;color:${BORDER};font-weight:bold;">AC</span>`
        );
      }
    });
  }

  fetchAcceptedLabels().then(paint);
})();