// Single source of truth for the left navigation on EVERY page.
//
// Two problems this file solves:
//
//  1. Pages that never call renderSidebar() — it self-initialises on
//     DOMContentLoaded, so just including the script is enough.
//
//  2. Pages with their own custom script that renders a DIFFERENT (shorter)
//     menu — a MutationObserver watches the container and re-asserts the full
//     list whenever something replaces it. This is why CDS Alerts and
//     Observations were showing only 10 items while the Dashboard showed all
//     of them: those pages build their own nav after this script has run.
//
// Adding a nav item? Add it to SIDEBAR_ITEMS and it appears everywhere.

const SIDEBAR_ITEMS = [
  { key: 'dashboard',         href: 'dashboard.html',         icon: '🏠',         label: 'Dashboard' },
  { key: 'patients',          href: 'patients.html',          icon: '🧑\u200d⚕️', label: 'Patients' },
  { key: 'conditions',        href: 'conditions.html',        icon: '🩺',         label: 'Conditions' },
  { key: 'observations',      href: 'observations.html',      icon: '📈',         label: 'Observations' },
  { key: 'allergies',         href: 'allergies.html',         icon: '⚠️',         label: 'Allergies' },
  { key: 'medications',       href: 'medications.html',       icon: '💊',         label: 'Medications' },
  { key: 'encounters',        href: 'encounters.html',        icon: '📅',         label: 'Encounters' },
  { key: 'organizations',     href: 'organizations.html',     icon: '🏥',         label: 'Organizations' },
  { key: 'locations',         href: 'locations.html',         icon: '📍',         label: 'Locations' },
  { key: 'practitioners',     href: 'practitioners.html',     icon: '👨‍⚕️',       label: 'Practitioners' },
  { key: 'practitionerroles', href: 'practitionerroles.html', icon: '🩹',         label: 'Practitioner Roles' },
  { key: 'servicerequests',   href: 'servicerequests.html',   icon: '📄',         label: 'Service Requests' },
  { key: 'riskassessments',   href: 'riskassessments.html',   icon: '📊',         label: 'Risk Assessment' },
  { key: 'cdsalerts',         href: 'cdsalerts.html',         icon: '🔔',         label: 'CDS Alerts' },
  { key: 'careplans',         href: 'careplans.html',         icon: '📋',         label: 'Care Plans' },
  { key: 'cdsrules',          href: 'cdsrules.html',          icon: '⚙️',         label: 'CDS Rules' },
  { key: 'users',             href: 'users.html',             icon: '👤',         label: 'Users' }
];

// Pages that deliberately have no sidebar (public / auth screens).
const SIDEBAR_EXCLUDED_PAGES = ['index.html', 'login.html', 'register.html', 'callback.html'];

// Set while this script is writing to the container, so the observer below
// doesn't react to its own changes and loop forever.
let sidebarWriting = false;

function sidebarContainer() {
  return document.getElementById('appSidebar') || document.querySelector('.app-sidebar');
}

// Works out which item to highlight from the URL, so a page doesn't have to
// pass its key in. An explicit key still wins when one is supplied.
function sidebarKeyFromUrl() {
  const file = (window.location.pathname.split('/').pop() || 'dashboard.html').toLowerCase();
  const match = SIDEBAR_ITEMS.find(i => i.href.toLowerCase() === file);
  return match ? match.key : '';
}

function renderSidebar(activeKey) {
  const container = sidebarContainer();
  if (!container) return;

  const key = activeKey || sidebarKeyFromUrl();
  const collapsed = localStorage.getItem('cip_sidebar_collapsed') === '1';

  sidebarWriting = true;

  container.innerHTML = `
    <button class="sidebar-toggle" id="sidebarToggle" type="button"
            title="Collapse / expand menu" aria-label="Toggle navigation">☰</button>
    <nav class="sidebar-nav">
      ${SIDEBAR_ITEMS.map(i => `
        <a href="${i.href}" class="sidebar-link ${i.key === key ? 'active' : ''}" title="${i.label}">
          <span class="sidebar-icon">${i.icon}</span><span class="sidebar-text">${i.label}</span>
        </a>`).join('')}
    </nav>
  `;

  applySidebarState(collapsed);

  document.getElementById('sidebarToggle').addEventListener('click', () => {
    const nowCollapsed = !document.body.classList.contains('sidebar-collapsed');
    applySidebarState(nowCollapsed);
    localStorage.setItem('cip_sidebar_collapsed', nowCollapsed ? '1' : '0');
  });

  // Release on the next tick so the observer ignores this whole write.
  setTimeout(() => { sidebarWriting = false; }, 0);
}

function applySidebarState(collapsed) {
  document.body.classList.toggle('sidebar-collapsed', collapsed);
}

// Re-render if the menu ever ends up with the wrong number of links — which
// is what happens when a page's own script overwrites the container after
// this one has run.
function guardSidebar() {
  const container = sidebarContainer();
  if (!container) return;

  new MutationObserver(() => {
    if (sidebarWriting) return;
    const links = container.querySelectorAll('.sidebar-link').length;
    if (links !== SIDEBAR_ITEMS.length) renderSidebar();
  }).observe(container, { childList: true, subtree: true });
}

function initSidebar() {
  const file = (window.location.pathname.split('/').pop() || '').toLowerCase();
  if (SIDEBAR_EXCLUDED_PAGES.includes(file)) return;

  renderSidebar();
  guardSidebar();

  // Belt and braces for pages whose own script runs late (after images and
  // stylesheets finish loading).
  window.addEventListener('load', () => {
    const container = sidebarContainer();
    if (container && container.querySelectorAll('.sidebar-link').length !== SIDEBAR_ITEMS.length) {
      renderSidebar();
    }
  });
}

if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', initSidebar);
} else {
  initSidebar();
}