// 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' }
];

// The collapse + scroll + search styles ship with this script rather than
// css/styles.css. That external file wasn't being picked up on most pages,
// which is why the toggle only ever worked on the dashboard.
const SIDEBAR_STYLES = `
.app-sidebar {
  display: flex;
  flex-direction: column;
  transition: width .16s ease;
  /* Without a bounded height the nav grows instead of scrolling, which is
     why the scrollbar never appeared. */
  max-height: 100vh;
  position: sticky;
  top: 0;
  overflow: hidden;
}
.sidebar-toggle {
  background: rgba(255,255,255,.14); border: none; color: #fff;
  font-size: 1.1rem; line-height: 1; width: 40px; height: 40px;
  border-radius: 10px; margin: 0 .2rem .6rem; cursor: pointer; flex-shrink: 0;
}
.sidebar-toggle:hover { background: rgba(255,255,255,.26); }

/* Hamburger in the top bar, left of the brand. */
.navbar-sidebar-toggle {
  background: rgba(255,255,255,.16); border: none; color: #fff;
  font-size: 1.15rem; line-height: 1; width: 38px; height: 38px;
  border-radius: 9px; margin-right: .75rem; cursor: pointer; flex-shrink: 0;
}
.navbar-sidebar-toggle:hover { background: rgba(255,255,255,.3); }

/* Welcome line at the top of the rail. */
.sidebar-welcome {
  padding: 0 .55rem .55rem; flex-shrink: 0;
  border-bottom: 1px solid rgba(255,255,255,.12); margin-bottom: .55rem;
}
.sidebar-welcome-hi { display: block; font-size: .72rem; color: rgba(255,255,255,.6); }
.sidebar-welcome-name {
  display: block; font-weight: 600; color: #fff; font-size: .95rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* --- Search --- */
.sidebar-search { padding: 0 .35rem .6rem; flex-shrink: 0; }
.sidebar-search input {
  width: 100%; border-radius: 8px; border: 1px solid rgba(255,255,255,.2);
  background: rgba(255,255,255,.12); color: #fff;
  padding: .35rem .6rem; font-size: .85rem;
}
.sidebar-search input::placeholder { color: rgba(255,255,255,.6); }
.sidebar-search input:focus {
  outline: none; border-color: rgba(255,255,255,.5);
  background: rgba(255,255,255,.18);
}
.sidebar-empty {
  color: rgba(255,255,255,.55); font-size: .82rem;
  padding: .5rem .6rem;
}

/* --- Scrollable nav so long menus don't get cut off --- */
.sidebar-nav {
  flex: 1 1 auto;
  overflow-y: auto;
  min-height: 0;
  padding-right: .15rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,.45) rgba(255,255,255,.08);
}
.sidebar-nav::-webkit-scrollbar { width: 10px; }
.sidebar-nav::-webkit-scrollbar-track { background: rgba(0,0,0,.22); border-radius: 5px; }
.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,.65); border-radius: 5px;
  border: 2px solid transparent; background-clip: content-box;
}
.sidebar-nav::-webkit-scrollbar-thumb:hover { background: #fff; background-clip: content-box; }

/* --- Collapsed rail --- */
/* !important because css/styles.css sets .app-sidebar { width: ... } and,
   depending on load order, could otherwise win this. */
body.sidebar-collapsed .app-sidebar,
body.sidebar-collapsed #appSidebar {
  width: 68px !important;
  min-width: 68px !important;
  padding-left: .4rem;
  padding-right: .4rem;
}
body.sidebar-collapsed .sidebar-text { display: none; }
body.sidebar-collapsed .sidebar-search,
body.sidebar-collapsed .sidebar-welcome { display: none; }
body.sidebar-collapsed .sidebar-link { justify-content: center; padding-left: .4rem; padding-right: .4rem; }
`;

function injectSidebarStyles() {
  if (document.getElementById('cip-sidebar-styles')) return;
  const style = document.createElement('style');
  style.id = 'cip-sidebar-styles';
  style.textContent = SIDEBAR_STYLES;
  document.head.appendChild(style);
}

// 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 : '';
}

// Puts the hamburger in the top bar, immediately left of the brand — the
// spot people reach for first. Returns false if the page has no navbar, in
// which case the button stays inside the sidebar as before.
function mountNavbarToggle() {
  const brand = document.querySelector('.navbar-brand');
  if (!brand) return false;

  if (!document.getElementById('sidebarToggle')) {
    const btn = document.createElement('button');
    btn.id = 'sidebarToggle';
    btn.type = 'button';
    btn.className = 'navbar-sidebar-toggle';
    btn.title = 'Collapse / expand menu';
    btn.setAttribute('aria-label', 'Toggle navigation');
    btn.textContent = '☰';
    brand.parentNode.insertBefore(btn, brand);
  }
  return true;
}

// "Welcome, <name>" using whoever signed in. auth.js stores the display name
// under cip_clinician at sign-in.
function currentUserName() {
  try {
    return sessionStorage.getItem('cip_clinician')
        || localStorage.getItem('cip_clinician')
        || '';
  } catch { return ''; }
}

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

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

  sidebarWriting = true;

  const navbarHasToggle = mountNavbarToggle();

  container.innerHTML = `
    ${navbarHasToggle ? '' : `
    <button class="sidebar-toggle" id="sidebarToggle" type="button"
            title="Collapse / expand menu" aria-label="Toggle navigation">☰</button>`}
    <div class="sidebar-welcome" id="sidebarWelcome"></div>
    <div class="sidebar-search">
      <input type="search" id="sidebarSearch" placeholder="Search menu…" autocomplete="off">
    </div>
    <nav class="sidebar-nav" id="sidebarNav">
      ${SIDEBAR_ITEMS.map(i => `
        <a href="${i.href}" class="sidebar-link ${i.key === key ? 'active' : ''}"
           data-label="${i.label.toLowerCase()}" title="${i.label}">
          <span class="sidebar-icon">${i.icon}</span><span class="sidebar-text">${i.label}</span>
        </a>`).join('')}
      <div class="sidebar-empty d-none" id="sidebarNoMatch">No matching page.</div>
    </nav>
  `;

  const name = currentUserName();
  const welcome = document.getElementById('sidebarWelcome');
  if (welcome) {
    welcome.innerHTML = name
      ? `<span class="sidebar-welcome-hi">Welcome,</span>
         <span class="sidebar-welcome-name">${name}</span>`
      : '';
    welcome.classList.toggle('d-none', !name);
  }

  applySidebarState(collapsed);

  // Filter the menu as you type. Expands the rail first if it's collapsed,
  // since the search box is hidden in that state.
  const search = document.getElementById('sidebarSearch');
  if (search) search.oninput = () => {
    const term = search.value.trim().toLowerCase();
    let shown = 0;

    container.querySelectorAll('.sidebar-link').forEach(a => {
      const match = !term || a.dataset.label.includes(term);
      a.classList.toggle('d-none', !match);
      if (match) shown++;
    });

    document.getElementById('sidebarNoMatch').classList.toggle('d-none', shown > 0);
  };

  // Assigned, not added. The navbar button is created once and survives
  // every re-render, so addEventListener stacked a new handler each time —
  // an even number of handlers flipped the state twice per click, which
  // looked exactly like a dead button.
  const toggleBtn = document.getElementById('sidebarToggle');
  if (toggleBtn) {
    toggleBtn.onclick = () => {
      const nowCollapsed = !document.body.classList.contains('sidebar-collapsed');
      applySidebarState(nowCollapsed);
      try {
        localStorage.setItem('cip_sidebar_collapsed', nowCollapsed ? '1' : '0');
      } catch {}
    };
  }

  // 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();
}