// ==UserScript==
// @name         Nyaa Nibl Search Buttons
// @namespace    your-namespace
// @version      1.0
// @description  Adds a search button with all title variants (including cleaned #desktop-title) and buttons for each title
// @match        https://kuroiru.co/*
// @grant        none
// @run-at       document-start
// @noframes
// ==/UserScript==

(function() {
  'use strict';

  // --- Shared CSS (applied once globally) ---
  const css = `
    .nyaa-btn {
      display: block;
      margin-top: 4px;
      padding: 4px 8px;
      background: #222;
      color: #aaa;
      border-radius: 4px;
      text-decoration: none;
      cursor: pointer;
      font-size: 90%;
      transition: all 0.2s ease;
    }
    .nyaa-btn:hover {
      background: #555;
      color: #fff;
    }
    .nyaa-btn-main {
      font-size: 100%;
      font-weight: bold;
    }
  `;
  const styleEl = document.createElement('style');
  styleEl.textContent = css;
  document.documentElement.appendChild(styleEl);

  // --- Title cleaning ---
  function cleanTitle(title) {
    return title
      .replace(/\b(Season|S)\s*\d+\b/gi, '')
      .replace(/\b(Part|Pt\.?)\s*\d+\b/gi, '')
      .replace(/\b(OVA|OAD|ONA|Special|SP)\b/gi, '')
      .replace(/[\[\]\(\)]/g, '')
      .replace(/\s*[-\|~]\s*/g, ' ')
      .replace(/\s+/g, ' ')
      .replace(/^[\s,.:;!?'"-]+|[\s,.:;!?'"-]+$/g, '')
      .trim();
  }

  // --- Button insertion logic ---
  function insertNyaaButtons() {
    const titleDiv = document.querySelector('#prompt-title-alt');
    const desktopTitleDiv = document.querySelector('#desktop-title');
    if (!titleDiv) return;

    // Avoid duplicates
    if (document.querySelector('.nyaa-btn-main')) return;

    // Gather titles
    const titles = [];
    if (titleDiv.textContent.trim()) {
      titles.push(
        ...titleDiv.textContent
          .split(',')
          .map(t => t.trim())
          .filter(Boolean)
      );
    }
    if (desktopTitleDiv && desktopTitleDiv.textContent.trim()) {
      const cleaned = cleanTitle(desktopTitleDiv.textContent);
      if (cleaned) titles.push(cleaned);
    }

    // Deduplicate (case-insensitive)
    const uniqueTitles = [...new Set(titles.map(t => t.toLowerCase()))]
      .map(lower => titles.find(t => t.toLowerCase() === lower));

    if (uniqueTitles.length === 0) return;

    // === Main Combined Button ===
    const queryAll = uniqueTitles.map(t => `"${t}"`).join('|');
    const encodedAll = encodeURIComponent(queryAll);
    const searchUrlAll = `https://nyaa.si/?f=0&c=1_2&q=${encodedAll}`;

    const mainBtn = document.createElement('a');
    mainBtn.href = searchUrlAll;
    mainBtn.target = '_blank';
    mainBtn.textContent = 'Nyaa (all)';
    mainBtn.className = 'nyaa-btn nyaa-btn-main';
    titleDiv.insertAdjacentElement('afterend', mainBtn);

    // === Individual Buttons ===
    uniqueTitles.forEach(t => {
      const encodedTitle = encodeURIComponent(t);
      const url = `https://nibl.co.uk/search?query=${encodedTitle}`;

      const btn = document.createElement('a');
      btn.href = url;
      btn.target = '_blank';
      btn.textContent = `Nibl: ${t}`;
      btn.className = 'nyaa-btn';
      mainBtn.insertAdjacentElement('afterend', btn);
    });
  }

  // --- Run once + observe DOM changes ---
  insertNyaaButtons();
  const observer = new MutationObserver(() => insertNyaaButtons());
  observer.observe(document.body, { childList: true, subtree: true });
})();