Motherless Quick Favorite

Add a ♥ favorite button to each thumbnail; detects existing favorites via staggered fetches
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// ==UserScript==
// @name         Motherless Quick Favorite
// @namespace    https://motherless.com/
// @version      1.2
// @description  Add a ♥ favorite button to each thumbnail; detects existing favorites via staggered fetches
// @author       You
// @match        https://motherless.com/*
// @grant        GM_xmlhttpRequest
// @connect      motherless.com
// @license      MIT
// ==/UserScript==

(function () {
  'use strict';

  // Delay between each status-check fetch (ms). Increase if you get rate-limited.
  const FETCH_DELAY_MS = 400;

  const BUTTON_STYLE = `
    position: absolute;
    top: 4px;
    left: 4px;
    z-index: 999;
    background: rgba(0,0,0,0.65);
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 5px 9px;
    font-size: 20px;
    cursor: pointer;
    line-height: 1;
    transition: background 0.15s;
  `;

  function getMediaId(thumbEl) {
    const inner = thumbEl.querySelector('[data-codename]');
    if (inner) return inner.getAttribute('data-codename');
    const link = thumbEl.querySelector('a[href]');
    if (!link) return null;
    const match = link.getAttribute('href').match(/\/([A-Z0-9]+)$/i);
    return match ? match[1] : null;
  }

  function setButtonState(btn, state) {
    if (state === 'favorited') {
      btn.textContent = '♥';
      btn.style.background = 'rgba(180,30,30,0.85)';
      btn.disabled = true;
      btn.title = 'Already favorited';
    } else if (state === 'loading') {
      btn.textContent = '…';
      btn.style.background = 'rgba(0,0,0,0.65)';
      btn.disabled = true;
    } else if (state === 'done') {
      btn.textContent = '♥';
      btn.style.background = 'rgba(180,30,30,0.85)';
      btn.disabled = true;
      btn.title = 'Favorited!';
    } else if (state === 'error') {
      btn.textContent = '✕';
      btn.style.background = 'rgba(180,0,0,0.85)';
      btn.disabled = false;
      btn.title = 'Error – click to retry';
    }
  }

  function checkFavoriteStatus(mediaId, btn) {
    GM_xmlhttpRequest({
      method: 'GET',
      url: `https://motherless.com/${mediaId}`,
      headers: { 'Referer': window.location.href },
      onload: function (res) {
        if (res.status === 200) {
          // If the "remove from favorites" button is present, it's already favorited
          if (res.responseText.indexOf('button-favorites-remove-upload') !== -1) {
            setButtonState(btn, 'favorited');
          }
          // else leave as default ♡
        }
      },
    });
  }

  function favoriteMedia(mediaId, btn) {
    setButtonState(btn, 'loading');

    GM_xmlhttpRequest({
      method: 'POST',
      url: `https://motherless.com/favorites/add?codename=${mediaId}`,
      headers: {
        'X-Requested-With': 'XMLHttpRequest',
        'Content-Type': 'application/x-www-form-urlencoded',
        'Referer': window.location.href,
      },
      onload: function (res) {
        if (res.status === 200) {
          setButtonState(btn, 'done');
        } else {
          console.warn('[QuickFav] Unexpected status:', res.status);
          setButtonState(btn, 'error');
        }
      },
      onerror: function () {
        setButtonState(btn, 'error');
      },
    });
  }

  // Queue of {mediaId, btn} pending a status check
  const checkQueue = [];
  let queueRunning = false;

  function enqueueCheck(mediaId, btn) {
    checkQueue.push({ mediaId, btn });
    if (!queueRunning) runQueue();
  }

  function runQueue() {
    if (checkQueue.length === 0) {
      queueRunning = false;
      return;
    }
    queueRunning = true;
    const { mediaId, btn } = checkQueue.shift();
    checkFavoriteStatus(mediaId, btn);
    setTimeout(runQueue, FETCH_DELAY_MS);
  }

  function injectButtons() {
    const thumbs = document.querySelectorAll('.thumb-container:not([data-qfav])');

    thumbs.forEach(function (thumb) {
      thumb.setAttribute('data-qfav', '1');

      const mediaId = getMediaId(thumb);
      if (!mediaId) return;

      const pos = window.getComputedStyle(thumb).position;
      if (pos === 'static') thumb.style.position = 'relative';

      const btn = document.createElement('button');
      btn.textContent = '♡';
      btn.title = 'Quick Favorite';
      btn.setAttribute('style', BUTTON_STYLE);

      btn.addEventListener('mouseenter', () => {
        if (!btn.disabled) btn.style.background = 'rgba(200,40,40,0.9)';
      });
      btn.addEventListener('mouseleave', () => {
        if (!btn.disabled) btn.style.background = 'rgba(0,0,0,0.65)';
      });

      btn.addEventListener('click', function (e) {
        e.preventDefault();
        e.stopPropagation();
        favoriteMedia(mediaId, btn);
      });

      thumb.appendChild(btn);

      // Queue a status check with staggered delay
      enqueueCheck(mediaId, btn);
    });
  }

  injectButtons();

  const observer = new MutationObserver(function () {
    injectButtons();
  });

  observer.observe(document.body, { childList: true, subtree: true });
})();