/* ── Severity config ─────────────────────────────────────────────────────── */
const SEV = {
  '-1': { label: 'OK',       color: '#2da44e' },
   '2': { label: 'Warning',  color: '#c69026' },
   '3': { label: 'Average',  color: '#e16f24' },
   '4': { label: 'High',     color: '#d1242f' },
   '5': { label: 'Disaster', color: '#8250df' },
};

const COUNTRY_NAMES = {
  AT: 'Austria', AUT: 'Austria', AUSTRIA: 'Austria',
  SK: 'Slovakia', SVK: 'Slovakia', SLOVAKIA: 'Slovakia',
};

const COUNTRY_FLAGS = {
  AT: 'at', AUT: 'at', AUSTRIA: 'at',
  SK: 'sk', SVK: 'sk', SLOVAKIA: 'sk',
};

function countryLabel(code) {
  return COUNTRY_NAMES[code?.toUpperCase()] || code || 'Unknown';
}

function countryFlagUrl(code) {
  const fc = COUNTRY_FLAGS[code?.toUpperCase()];
  return fc ? `https://flagcdn.com/32x24/${fc}.png` : null;
}

function sevInfo(sev) {
  return SEV[String(sev)] || SEV['-1'];
}

/* ── State ───────────────────────────────────────────────────────────────── */
let currentView      = 'restaurants';
let refreshTimer     = null;
let zabbixUrl        = '';
let customerTagValue = 'QWE';
let hasRendered      = false;
let lastDataKey      = null;
const REFRESH_MS     = 30_000;

/* ── Boot ────────────────────────────────────────────────────────────────── */
document.addEventListener('DOMContentLoaded', async () => {
  try {
    const cfg = await apiFetch('/api/config');
    zabbixUrl        = cfg.zabbixUrl.replace(/\/$/, '');
    customerTagValue = cfg.customerTagValue || 'QWE';
  } catch (_) {}
  initControls();
  loadData();
  scheduleRefresh();
});

/* ── Controls ────────────────────────────────────────────────────────────── */
function initControls() {
  document.querySelectorAll('.toggle-btn').forEach(btn => {
    btn.addEventListener('click', () => {
      document.querySelectorAll('.toggle-btn').forEach(b => b.classList.remove('active'));
      btn.classList.add('active');
      currentView = btn.dataset.view;
      hasRendered = false;
      lastDataKey = null;
      loadData();
    });
  });

  document.getElementById('refresh-btn').addEventListener('click', () => {
    loadData();
    scheduleRefresh();
  });

  document.getElementById('modal-close-btn').addEventListener('click', closeModal);
  document.getElementById('modal').addEventListener('click', e => {
    if (e.target === e.currentTarget) closeModal();
  });
  document.addEventListener('keydown', e => {
    if (e.key === 'Escape') closeModal();
  });
}

/* ── Data loading ────────────────────────────────────────────────────────── */
async function loadData() {
  setRefreshSpinner(true);
  if (!hasRendered) showPageLoading();

  try {
    const endpoint = currentView === 'restaurants' ? '/api/restaurants' : '/api/devices';
    const [items, stats] = await Promise.all([
      apiFetch(endpoint),
      apiFetch('/api/stats').catch(() => ({})),
    ]);
    const key = JSON.stringify({ items, stats });
    if (key !== lastDataKey) {
      lastDataKey = key;
      renderCountryColumns(items, stats);
      updateSummary(items);
    }
    setLastUpdated(new Date());
    hasRendered = true;
  } catch (e) {
    showPageError(e.message);
  } finally {
    setRefreshSpinner(false);
  }
}

function scheduleRefresh() {
  clearTimeout(refreshTimer);
  refreshTimer = setTimeout(() => { loadData(); scheduleRefresh(); }, REFRESH_MS);
}

/* ── Country column layout ───────────────────────────────────────────────── */
function renderCountryColumns(items, stats = {}) {
  const byCountry = {};
  for (const item of items) {
    const key = item.country || '';
    if (!byCountry[key]) byCountry[key] = [];
    byCountry[key].push(item);
  }

  const countries = Object.keys(byCountry).sort();
  const wrap = document.getElementById('countries-wrap');

  if (countries.length === 0) {
    wrap.innerHTML = '<div class="page-center"><p>No items found.</p></div>';
    return;
  }

  const frag = document.createDocumentFragment();
  const refs = [];

  countries.forEach(country => {
    const col = document.createElement('div');
    col.className = 'country-col';

    const colItems = byCountry[country];
    const flagUrl  = countryFlagUrl(country);
    const flagImg  = flagUrl
      ? `<img src="${flagUrl}" alt="" style="height:22px;width:auto;border-radius:2px;flex-shrink:0;">`
      : '';

    const s = stats[country];
    const statsHtml = s
      ? `${s.hostCount.toLocaleString()} hosts · ${s.itemCount.toLocaleString()} items · ${s.triggerCount.toLocaleString()} triggers`
      : '';

    const hdr = document.createElement('div');
    hdr.className = 'country-col-header';
    hdr.innerHTML = `
      <span style="display:flex;align-items:center;gap:10px;">${flagImg}${esc(countryLabel(country))}</span>
      <span class="country-col-stats">${statsHtml}</span>
    `;

    const body = document.createElement('div');
    body.className = 'country-col-body';

    const grid = document.createElement('div');
    grid.className = 'hex-grid';
    body.appendChild(grid);
    col.appendChild(hdr);
    col.appendChild(body);
    frag.appendChild(col);

    refs.push({ grid, body, colItems });
  });

  // Single atomic swap — old content replaced in one operation
  wrap.replaceChildren(frag);

  // Measure layout and render hex items after browser has laid out the new columns
  requestAnimationFrame(() => {
    const hexW   = parseInt(getComputedStyle(document.documentElement).getPropertyValue('--hex-w'));
    const hexGap = parseInt(getComputedStyle(document.documentElement).getPropertyValue('--hex-gap'));
    refs.forEach(({ grid, body, colItems }) => {
      const colW   = body.clientWidth - 40;
      const perRow = Math.max(2, Math.floor(colW / (hexW + hexGap)));
      renderHexGrid(grid, colItems, perRow);
      renderProblemList(body, colItems);
    });
  });
}

function renderHexGrid(container, items, perRow) {
  const rows = chunk(items, perRow);
  const wrap = document.createElement('div');
  wrap.className = 'hex-col-wrap';

  rows.forEach((row, ri) => {
    const rowEl = document.createElement('div');
    rowEl.className = 'hex-row' + (ri % 2 === 1 ? ' offset' : '');
    row.forEach(item => rowEl.appendChild(buildHex(item)));
    wrap.appendChild(rowEl);
  });

  container.innerHTML = '';
  container.appendChild(wrap);
}

/* ── Hex builder ─────────────────────────────────────────────────────────── */
function buildHex(item) {
  const sev    = item.severity;
  const info   = sevInfo(sev);
  const label  = item.location || item.name || '—';
  const id     = item.location || item.deviceType || '';
  const type   = item.location ? 'restaurant' : 'device';
  const issues = item.problemCount || 0;
  const hosts  = item.hostCount   || 0;

  const el = document.createElement('div');
  el.className = `hex-item sev-${sev}${type === 'device' ? ' hex-item--device' : ''}`;
  el.style.background = info.color;
  el.title = `${label}\n${hosts} host(s) · ${issues} issue(s) · ${info.label}\n\nClick: details   Double-click: open in Zabbix`;

  const labelEl = document.createElement('span');
  labelEl.className   = 'hex-label';
  labelEl.textContent = label;
  el.appendChild(labelEl);

  const hostsEl = document.createElement('span');
  hostsEl.className   = 'hex-hosts';
  hostsEl.textContent = `${hosts} host${hosts !== 1 ? 's' : ''}`;
  el.appendChild(hostsEl);

  if (issues > 0) {
    const countEl = document.createElement('span');
    countEl.className   = 'hex-count';
    countEl.textContent = `${issues} issue${issues !== 1 ? 's' : ''}`;
    el.appendChild(countEl);
  }

  // Use timer to distinguish single click (modal) from double click (Zabbix)
  let clickTimer = null;
  el.addEventListener('click', () => {
    clearTimeout(clickTimer);
    clickTimer = setTimeout(() => openModal(type, id, label, String(sev)), 240);
  });
  el.addEventListener('dblclick', () => {
    clearTimeout(clickTimer);
    window.open(buildZabbixProblemsUrl(type, id), '_blank');
  });
  return el;
}

/* ── Modal ───────────────────────────────────────────────────────────────── */
async function openModal(type, id, label, sev) {
  const modal = document.getElementById('modal');
  const info  = sevInfo(sev);

  document.getElementById('modal-title').textContent        = label;
  document.getElementById('modal-sev-dot').style.background = info.color;
  document.getElementById('modal-body').innerHTML =
    '<div class="modal-loading"><div class="spinner"></div></div>';
  modal.style.display = 'flex';

  try {
    const items = await apiFetch(
      `/api/detail?type=${encodeURIComponent(type)}&id=${encodeURIComponent(id)}`
    );
    renderModalBody(document.getElementById('modal-body'), items);
  } catch (e) {
    document.getElementById('modal-body').innerHTML =
      `<div class="error-box">Failed to load details: ${esc(e.message)}</div>`;
  }
}

function renderModalBody(body, items) {
  if (!items || items.length === 0) {
    body.innerHTML = '<p style="color:var(--text-muted);font-size:0.85rem;">No hosts found.</p>';
    return;
  }

  body.innerHTML = items.map(host => {
    const info = sevInfo(String(host.severity));

    const problemsHtml = host.problems.length === 0
      ? `<p class="no-problems">✓ No active problems</p>`
      : `<div class="problem-list">${host.problems.map(p => {
          const pi = sevInfo(String(p.priority));
          return `
            <div class="problem-row">
              <span class="problem-pip" style="background:${pi.color}"></span>
              <div>
                <div class="problem-text">${esc(p.description)}</div>
                <div class="problem-time">${esc(p.lastchange)}</div>
              </div>
            </div>`;
        }).join('')}</div>`;

    return `
      <div class="host-card">
        <div class="host-card-header">
          <span class="host-name" title="${esc(host.name)}">${esc(host.name)}</span>
          <span class="sev-badge" style="background:${info.color}">${esc(info.label)}</span>
        </div>
        ${problemsHtml}
      </div>`;
  }).join('');
}

/* ── Problem list (below hex grid) ──────────────────────────────────────── */
function renderProblemList(container, items) {
  const withProblems = items.filter(i => i.problems && i.problems.length > 0);
  if (withProblems.length === 0) return;

  const section = document.createElement('div');
  section.className = 'problems-section';

  const title = document.createElement('div');
  title.className = 'problems-section-title';
  title.textContent = 'Active Problems';
  section.appendChild(title);

  for (const item of withProblems) {
    const label = item.location || item.name || '—';

    const group = document.createElement('div');
    group.className = 'problem-group';

    const groupHdr = document.createElement('div');
    groupHdr.className = 'problem-group-header';
    groupHdr.innerHTML =
      `<span class="problem-group-label">${esc(label)}</span>` +
      `<span class="problem-group-count">${item.problems.length}</span>`;
    group.appendChild(groupHdr);

    for (const p of item.problems) {
      const info = sevInfo(String(p.priority));
      const row  = document.createElement('div');
      row.className = 'problem-list-row';
      row.innerHTML =
        `<span class="pl-dot" style="background:${info.color}"></span>` +
        `<span class="pl-host">${esc(p.hostName)}</span>` +
        `<span class="pl-desc">${esc(p.description)}</span>` +
        `<span class="pl-time">${timeAgo(p.lastchange)}</span>`;
      group.appendChild(row);
    }

    section.appendChild(group);
  }

  container.appendChild(section);
}

function timeAgo(unixSeconds) {
  const diff = Math.floor(Date.now() / 1000) - unixSeconds;
  if (diff < 60)    return `${diff}s ago`;
  if (diff < 3600)  return `${Math.floor(diff / 60)}m ago`;
  if (diff < 86400) return `${Math.floor(diff / 3600)}h ago`;
  return `${Math.floor(diff / 86400)}d ago`;
}

function buildZabbixProblemsUrl(type, id) {
  // Zabbix 7.x URL parameter format (no filter_ prefix)
  const p = [
    'action=problem.view',
    'show=1',        // Recent problems
    'evaltype=0',    // AND tag matching
    // Exclude Not classified (0) and Information (1) — show Warning and above
    'severities[]=2',
    'severities[]=3',
    'severities[]=4',
    'severities[]=5',
  ];

  if (type === 'restaurant') {
    p.push(`tags[0][tag]=customer`);
    p.push(`tags[0][value]=${encodeURIComponent(customerTagValue)}`);
    p.push(`tags[0][operator]=1`);
    p.push(`tags[1][tag]=location`);
    p.push(`tags[1][value]=${encodeURIComponent(id)}`);
    p.push(`tags[1][operator]=1`);
  } else {
    p.push(`tags[0][tag]=customer`);
    p.push(`tags[0][value]=${encodeURIComponent(customerTagValue)}`);
    p.push(`tags[0][operator]=1`);
    p.push(`tags[1][tag]=deviceType`);
    p.push(`tags[1][value]=${encodeURIComponent(id)}`);
    p.push(`tags[1][operator]=1`);
  }

  return `${zabbixUrl}/zabbix.php?${p.join('&')}`;
}

function closeModal() {
  document.getElementById('modal').style.display = 'none';
}

/* ── UI helpers ──────────────────────────────────────────────────────────── */
function showPageLoading() {
  document.getElementById('countries-wrap').innerHTML =
    '<div class="page-center"><div class="spinner"></div><p>Loading…</p></div>';
}

function showPageError(msg) {
  document.getElementById('countries-wrap').innerHTML =
    `<div class="error-box">Error: ${esc(msg)}</div>`;
}

function setRefreshSpinner(on) {
  document.getElementById('refresh-btn').classList.toggle('spinning', on);
}

function updateSummary(items) {
  const issues = items.filter(i => i.severity >= 2).length;
  document.getElementById('summary').innerHTML = issues > 0
    ? `<strong>${items.length}</strong> items · <strong style="color:#d1242f">${issues} with issues</strong>`
    : `<strong>${items.length}</strong> items · <strong style="color:#2da44e">All OK</strong>`;
}

function setLastUpdated(date) {
  document.getElementById('last-updated').textContent =
    `Updated ${date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' })}`;
}

/* ── Fetch wrapper ───────────────────────────────────────────────────────── */
async function apiFetch(url) {
  const res  = await fetch(url);
  const data = await res.json();
  if (!res.ok || data.error) throw new Error(data.error || `HTTP ${res.status}`);
  return data;
}

/* ── Utils ───────────────────────────────────────────────────────────────── */
function esc(str) {
  return String(str)
    .replace(/&/g, '&amp;').replace(/</g, '&lt;')
    .replace(/>/g, '&gt;').replace(/"/g, '&quot;');
}

function chunk(arr, size) {
  const out = [];
  for (let i = 0; i < arr.length; i += size) out.push(arr.slice(i, i + size));
  return out;
}