const CONFIG_URL = '/services.json?v=1';
const LOCAL_CONFIG_KEY = 'mischlabs.dashboard.config';

const icons = {
  shield: '<path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"></path><path d="M9 12l2 2 4-4"></path>',
  folder: '<path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z"></path>',
  lock: '<rect x="3" y="11" width="18" height="11" rx="2"></rect><path d="M7 11V7a5 5 0 0 1 10 0v4"></path><circle cx="12" cy="16" r="1"></circle>',
  film: '<rect x="2" y="2" width="20" height="20" rx="2.2"></rect><line x1="7" y1="2" x2="7" y2="22"></line><line x1="17" y1="2" x2="17" y2="22"></line><line x1="2" y1="12" x2="22" y2="12"></line>',
  headphones: '<path d="M3 18v-6a9 9 0 0 1 18 0v6"></path><path d="M21 19a2 2 0 0 1-2 2h-1a2 2 0 0 1-2-2v-3a2 2 0 0 1 2-2h3zM3 19a2 2 0 0 0 2 2h1a2 2 0 0 0 2-2v-3a2 2 0 0 0-2-2H3z"></path>',
  book: '<path d="M2 3h6a4 4 0 0 1 4 4v14a3 3 0 0 0-3-3H2z"></path><path d="M22 3h-6a4 4 0 0 0-4 4v14a3 3 0 0 1 3-3h7z"></path>',
  git: '<circle cx="12" cy="12" r="4"></circle><line x1="1.05" y1="12" x2="7" y2="12"></line><line x1="17.01" y1="12" x2="22.96" y2="12"></line><path d="M12 1.05V7"></path><path d="M12 17.01v5.95"></path>',
  chess: '<path d="M8 16l-1 4h10l-1-4"></path><path d="M6.5 16h11"></path><path d="M12 2a2 2 0 0 1 2 2c0 1.1-.9 2-2 3-1.1-1-2-1.9-2-3a2 2 0 0 1 2-2z"></path><path d="M9 7 6 10.5c-.6.7-.2 1.5.7 1.5h10.6c.9 0 1.3-.8.7-1.5L15 7"></path><path d="M9 12v4"></path><path d="M15 12v4"></path>',
  user: '<path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path><circle cx="12" cy="7" r="4"></circle>'
};

let cards = [];
let sections = [];
let config = null;
let activeFilter = 'all';
let categoryById = new Map();

const searchInput = document.querySelector('#serviceSearch');
const segments = [...document.querySelectorAll('.segment')];
const emptyState = document.querySelector('#emptyState');
const onlineCount = document.querySelector('#onlineCount');
const serviceCount = document.querySelector('#serviceCount');
const lastChecked = document.querySelector('#lastChecked');
const dashboardSections = document.querySelector('#dashboardSections');

function normalize(value) {
  return String(value || '').toLowerCase().trim();
}

function getLocalConfig() {
  try {
    const raw = window.localStorage.getItem(LOCAL_CONFIG_KEY);
    return raw ? JSON.parse(raw) : null;
  } catch {
    return null;
  }
}

async function loadConfig() {
  const response = await fetch(CONFIG_URL, { cache: 'no-store' });
  const baseConfig = await response.json();
  return getLocalConfig() || baseConfig;
}

function serviceSearchText(service) {
  return [
    service.name,
    service.description,
    service.domain,
    service.category,
    service.keywords
  ].join(' ');
}

function createServiceCard(service) {
  const category = categoryById.get(service.category);
  const card = document.createElement('a');
  card.href = service.url;
  card.target = '_blank';
  card.rel = 'noopener';
  card.className = 'card service-card';
  card.dataset.category = service.category;
  card.dataset.url = service.url;
  card.dataset.name = serviceSearchText(service);
  card.innerHTML = `
    <span class="status-dot" aria-label="Status wird geprueft"></span>
    <div class="card-icon" style="--accent: ${service.accent};">
      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
        ${icons[service.icon] || icons.folder}
      </svg>
    </div>
    <div class="card-content">
      <span class="card-category">${category?.label || 'Dienst'}</span>
      <h3>${service.name}</h3>
      <p>${service.description}</p>
    </div>
    <span class="card-domain">${service.domain}</span>
  `;
  return card;
}

function renderDashboard(nextConfig) {
  dashboardSections.innerHTML = '';
  serviceCount.textContent = String(nextConfig.services.length);
  categoryById = new Map(nextConfig.categories.map((category) => [category.id, category]));

  const section = document.createElement('section');
  section.className = 'section service-overview';
  section.innerHTML = `
    <div class="section-heading">
      <div>
        <p class="section-kicker" id="overviewKicker">Dashboard</p>
        <h2 id="overviewTitle">Alle Dienste</h2>
      </div>
      <span class="section-count" id="overviewCount">${nextConfig.services.length} Dienste</span>
    </div>
    <div class="grid"></div>
  `;

  const grid = section.querySelector('.grid');
  nextConfig.services.forEach((service) => grid.appendChild(createServiceCard(service)));
  dashboardSections.appendChild(section);

  cards = [...document.querySelectorAll('.service-card')];
  sections = [...document.querySelectorAll('.section')];
  updateOverviewHeading(nextConfig.services.length);
}

function updateOverviewHeading(visibleCards) {
  const activeCategory = categoryById.get(activeFilter);
  const term = normalize(searchInput.value);
  const kicker = document.querySelector('#overviewKicker');
  const title = document.querySelector('#overviewTitle');
  const count = document.querySelector('#overviewCount');
  if (!kicker || !title || !count) return;

  kicker.textContent = activeCategory ? activeCategory.label : 'Dashboard';
  title.textContent = activeCategory ? activeCategory.title : 'Alle Dienste';
  count.textContent = `${visibleCards} ${visibleCards === 1 ? 'Dienst' : 'Dienste'}${term ? ' gefunden' : ''}`;
}

function updateVisibility() {
  const term = normalize(searchInput.value);
  let visibleCards = 0;

  cards.forEach((card) => {
    const categoryMatches = activeFilter === 'all' || card.dataset.category === activeFilter;
    const searchMatches = !term || normalize(card.dataset.name).includes(term);
    const isVisible = categoryMatches && searchMatches;
    card.hidden = !isVisible;
    if (isVisible) visibleCards += 1;
  });

  sections.forEach((section) => {
    const hasVisibleCards = [...section.querySelectorAll('.service-card')].some((card) => !card.hidden);
    section.hidden = !hasVisibleCards;
  });

  updateOverviewHeading(visibleCards);
  emptyState.hidden = visibleCards !== 0;
}

function setActiveFilter(nextFilter) {
  activeFilter = nextFilter;
  segments.forEach((segment) => {
    const isActive = segment.dataset.filter === nextFilter;
    segment.classList.toggle('is-active', isActive);
    segment.setAttribute('aria-selected', String(isActive));
  });
  updateVisibility();
}

async function probeService(card) {
  const controller = new AbortController();
  const timeout = window.setTimeout(() => controller.abort(), 4500);

  try {
    await fetch(card.dataset.url, {
      method: 'GET',
      mode: 'no-cors',
      cache: 'no-store',
      signal: controller.signal
    });
    card.classList.add('is-online');
    card.classList.remove('is-offline');
    card.classList.remove('is-unknown');
    card.querySelector('.status-dot').setAttribute('aria-label', 'Online');
    return true;
  } catch (error) {
    const isTimeout = error.name === 'AbortError';
    card.classList.toggle('is-offline', isTimeout);
    card.classList.toggle('is-unknown', !isTimeout);
    card.classList.remove('is-online');
    card.querySelector('.status-dot').setAttribute(
      'aria-label',
      isTimeout ? 'Nicht erreichbar' : 'Im Browser nicht pruefbar'
    );
    return isTimeout ? false : null;
  } finally {
    window.clearTimeout(timeout);
  }
}

async function refreshStatus() {
  const results = await Promise.allSettled(cards.map(probeService));
  const online = results.filter((result) => result.status === 'fulfilled' && result.value).length;
  const unknown = results.filter((result) => result.status === 'fulfilled' && result.value === null).length;
  onlineCount.textContent = String(online);
  lastChecked.textContent = `Status geprueft: ${new Date().toLocaleTimeString('de-DE', {
    hour: '2-digit',
    minute: '2-digit'
  })}${unknown ? `, ${unknown} im Browser nicht pruefbar` : ''}`;
}

function scheduleStatusRefresh() {
  const run = () => refreshStatus().catch(() => {
    onlineCount.textContent = '--';
    lastChecked.textContent = 'Status aktuell nicht verfuegbar.';
  });

  if ('requestIdleCallback' in window) {
    window.requestIdleCallback(run, { timeout: 2000 });
  } else {
    window.setTimeout(run, 600);
  }
}

segments.forEach((segment) => {
  segment.addEventListener('click', () => setActiveFilter(segment.dataset.filter));
});

searchInput.addEventListener('input', updateVisibility);

if ('serviceWorker' in navigator) {
  window.addEventListener('load', () => {
    navigator.serviceWorker.register('/sw.js').catch(() => {});
  });
}

loadConfig()
  .then((nextConfig) => {
    config = nextConfig;
    renderDashboard(config);
    updateVisibility();
    scheduleStatusRefresh();
  })
  .catch(() => {
    dashboardSections.innerHTML = '<p class="empty-state">Dashboard-Konfiguration konnte nicht geladen werden.</p>';
    onlineCount.textContent = '--';
  });