import { APPS, HOME_ICON, makeSvg, getDock } from './apps';

const CSS = `
.nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 10;
  display: flex;
  align-items: stretch;
  background: var(--nav-bg);
  border-top: 1px solid var(--nav-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  transition: background 0.3s;
  will-change: auto;
}
[data-theme="paper"] .nav { backdrop-filter: none; -webkit-backdrop-filter: none; }
.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  flex: 1;
  padding: 10px 0;
  border: none;
  background: transparent;
  color: var(--text-faint);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s;
  font-family: 'DM Sans', sans-serif;
}
.nav-btn span { font-size: 10px; letter-spacing: 0.04em; font-weight: 400; }
.nav-btn:hover { color: var(--text-mid); }
.nav-btn.active { color: var(--gold); }
[data-theme="paper"] .nav-btn:hover { background: rgba(0,0,0,0.05); }
[data-theme="paper"] .nav-btn.active { color: #000; }
`;

function injectCss() {
  if (document.getElementById('palace-nav-css')) return;
  const style = document.createElement('style');
  style.id = 'palace-nav-css';
  style.textContent = CSS;
  document.head.appendChild(style);
}

function buildNav() {
  const nav = document.getElementById('nav');
  if (!nav) return;

  const path = window.location.pathname;
  const activeId = path === '/' || path === '/home' ? 'home'
    : path.startsWith('/config') ? 'config'
    : path.startsWith('/') ? path.slice(1).split('/')[0] : path;

  nav.innerHTML = '';

  function makeBtn(href: string, label: string, svgHtml: string, isActive: boolean): HTMLAnchorElement {
    const a = document.createElement('a');
    a.className = 'nav-btn' + (isActive ? ' active' : '');
    a.href = href;
    a.title = label;
    a.innerHTML = svgHtml + '<span>' + label + '</span>';
    return a;
  }

  nav.appendChild(makeBtn('/home', 'Home', HOME_ICON, activeId === 'home'));

  const dock: string[] = getDock();
  dock.forEach(id => {
    const app = APPS.find(a => a.id === id);
    if (!app) return;
    nav.appendChild(makeBtn(app.href, app.label, makeSvg(app.icon), activeId === id));
  });
}

export function initNav() {
  injectCss();
  buildNav();
  document.addEventListener('astro:page-load', buildNav);
  window.addEventListener('pr-dock-changed', () => buildNav());
}