BlackRidge - Nav Always Expanded

Nav groups are expanded by default. Click headers to collapse. Remembers collapsed state across refreshes.
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// ==UserScript==
// @name         BlackRidge - Nav Always Expanded
// @namespace    blackridge.alwaysdisplay
// @version      1.0.1
// @description  Nav groups are expanded by default. Click headers to collapse. Remembers collapsed state across refreshes.
// @author       User
// @match        https://blackridgerpg.com/*
// @match        https://www.blackridgerpg.com/*
// @grant        none
// @run-at       document-start
// @license      MIT
// ==/UserScript==

(function () {
  'use strict';

  const STORAGE_KEY = 'br-nav-collapsed';
  const NAV_GROUPS = [
    'navgroup-city',
    'navgroup-ops',
    'navgroup-arsenal',
    'navgroup-finances',
    'navgroup-bureau'
  ];
  let isDelegatedToggleBound = false;
  let navObserver = null;
  let applyScheduled = false;

  // Load collapsed set from localStorage
  function loadCollapsed() {
    try {
      return new Set(JSON.parse(localStorage.getItem(STORAGE_KEY) || '[]'));
    } catch {
      return new Set();
    }
  }

  // Save collapsed set to localStorage
  function saveCollapsed(collapsedSet) {
    try {
      localStorage.setItem(STORAGE_KEY, JSON.stringify([...collapsedSet]));
    } catch {
      // Ignore storage failures; the current click should still update the UI.
    }
  }

  // Apply open/closed visual state to a group
  function applyGroupState(id, isCollapsed) {
    const group = document.getElementById(id);
    if (!group) return;

    const items = group.querySelector('.nav-group-items');
    const arrow = group.querySelector('.nav-group-arrow');
    const header = group.querySelector('.nav-group-header');

    group.classList.toggle('open', !isCollapsed);

    if (items) {
      const desiredDisplay = isCollapsed ? 'none' : '';
      if (items.style.display !== desiredDisplay) {
        items.style.display = desiredDisplay;
      }
    }
    if (arrow) {
      const desiredArrow = isCollapsed ? '\u25b8' : '\u25be';
      if (arrow.textContent !== desiredArrow) {
        arrow.textContent = desiredArrow;
      }
    }
    if (header) {
      const desiredExpanded = String(!isCollapsed);
      if (header.getAttribute('aria-expanded') !== desiredExpanded) {
        header.setAttribute('aria-expanded', desiredExpanded);
      }
      if (header.hasAttribute('onclick')) {
        header.removeAttribute('onclick');
      }
    }
  }

  function toggleGroup(id, collapsedSet) {
    if (collapsedSet.has(id)) {
      collapsedSet.delete(id);
    } else {
      collapsedSet.add(id);
    }
    saveCollapsed(collapsedSet);
    applyGroupState(id, collapsedSet.has(id));
  }

  function applyAllStates(collapsedSet) {
    NAV_GROUPS.forEach(id => {
      applyGroupState(id, collapsedSet.has(id));
    });
  }

  function bindDelegatedToggle(collapsedSet) {
    if (isDelegatedToggleBound) return;

    document.addEventListener('click', event => {
      if (!(event.target instanceof Element)) return;

      const header = event.target.closest('.nav-group-header');
      if (!header) return;

      const group = header.closest('.nav-group');
      if (!group || !NAV_GROUPS.includes(group.id)) return;

      // Use script-controlled toggle behavior and avoid conflicts with inline handlers.
      event.preventDefault();
      event.stopPropagation();
      event.stopImmediatePropagation();
      header.removeAttribute('onclick');
      toggleGroup(group.id, collapsedSet);
    }, true);

    isDelegatedToggleBound = true;
  }

  function scheduleApplyAllStates(collapsedSet) {
    if (applyScheduled) return;

    applyScheduled = true;
    requestAnimationFrame(() => {
      applyScheduled = false;
      applyAllStates(collapsedSet);
    });
  }

  function watchNavRerenders(collapsedSet) {
    if (navObserver) return;

    navObserver = new MutationObserver(() => {
      scheduleApplyAllStates(collapsedSet);
    });

    navObserver.observe(document.documentElement || document, {
      childList: true,
      subtree: true,
      attributes: true,
      attributeFilter: ['class', 'onclick', 'style']
    });
  }

  function init() {
    const collapsed = loadCollapsed();

    bindDelegatedToggle(collapsed);
    watchNavRerenders(collapsed);
    applyAllStates(collapsed);
    scheduleApplyAllStates(collapsed);
  }

  init();
})();