import { apiAction, toast } from './api.js';
import { initUserPanel } from './ui-user.js';
import { mountLogoutButton, ensureFloatingLogout } from './ui-auth.js';

const state = {
  counts: { templates: 0, sections: 0, blocks: 0, snippets: 0, renders_total: 0 },
  usage: [],
};

async function ensureAuthenticated() {
  try {
    const me = await apiAction('auth.me', { method: 'GET' });
    if (!me?.ok || !me?.user) {
      if (!window.DISABLE_AUTH_REDIRECT) {
        window.location.href = '/login.php';
      }
      return false;
    }
    window.__currentUser = me.user;
    document.documentElement.classList.remove('auth-pending');
    return true;
  } catch {
    return false;
  }
}

function ensureAccess() {
  const role = (window.__currentUser?.role || '').toLowerCase();
  if (role !== 'owner' && role !== 'admin') {
    toast('Kein Zugriff auf das Dashboard', false);
    window.location.href = '/admin/profile.php';
    return false;
  }
  return true;
}

function renderCounts(counts) {
  const mapping = {
    templates: 'count-templates',
    sections: 'count-sections',
    blocks: 'count-blocks',
    snippets: 'count-snippets',
    renders_total: 'count-usage',
  };
  Object.entries(mapping).forEach(([key, id]) => {
    const el = document.getElementById(id);
    if (!el) return;
    const value = counts[key] ?? 0;
    el.textContent = typeof value === 'number' ? value.toLocaleString('de-DE') : value;
  });
}

function formatDate(value) {
  if (!value) return '–';
  try {
    const date = new Date(value);
    if (Number.isNaN(date.getTime())) return value;
    return date.toLocaleString('de-DE');
  } catch {
    return value;
  }
}

function renderUsage(list) {
  const table = document.getElementById('usageTable');
  if (!table) return;
  const tbody = table.querySelector('tbody');
  if (!tbody) return;
  if (!list.length) {
    tbody.innerHTML = '<tr><td colspan="4" class="text-sm text-slate-500">Noch keine Daten vorhanden.</td></tr>';
    return;
  }
  tbody.innerHTML = list.map(item => `
    <tr data-template-id="${item.template_id}">
      <td>${escapeHtml(item.name)}</td>
      <td>${item.render_count.toLocaleString('de-DE')}</td>
      <td>${escapeHtml(formatDate(item.last_rendered_at || item.updated_at))}</td>
      <td class="text-right">
        <button type="button" class="btn" data-reset="${item.template_id}">Zähler zurücksetzen</button>
      </td>
    </tr>
  `).join('');
}

function escapeHtml(str) {
  return String(str ?? '')
    .replace(/&/g, '&amp;')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;')
    .replace(/'/g, '&#39;');
}

async function loadMetrics() {
  try {
    const res = await apiAction('dashboard.metrics', { method: 'GET' });
    if (!res?.ok) throw new Error(res?.error || 'Dashboard konnte nicht geladen werden');
    state.counts = res.counts || state.counts;
    state.usage = Array.isArray(res.usage) ? res.usage : [];
    renderCounts(state.counts);
    renderUsage(state.usage);
  } catch (err) {
    toast(err.message || 'Fehler beim Laden', false);
  }
}

async function resetUsage(templateId) {
  try {
    await apiAction('dashboard.reset_usage', { method: 'POST', data: { template_id: templateId } });
    toast('Zähler zurückgesetzt', true);
    await loadMetrics();
  } catch (err) {
    toast(err.message || 'Zurücksetzen fehlgeschlagen', false);
  }
}

function bindEvents() {
  const refresh = document.getElementById('btn-refresh-dashboard');
  refresh?.addEventListener('click', () => loadMetrics());

  const table = document.getElementById('usageTable');
  table?.addEventListener('click', ev => {
    const btn = ev.target.closest('button[data-reset]');
    if (!btn) return;
    const id = Number(btn.getAttribute('data-reset'));
    if (!id) return;
    if (confirm('Zähler für dieses Template wirklich löschen?')) {
      resetUsage(id);
    }
  });
}

document.addEventListener('DOMContentLoaded', async () => {
  const ok = await ensureAuthenticated();
  if (!ok) return;
  if (!ensureAccess()) return;
  initUserPanel();
  bindEvents();
  await loadMetrics();
  mountLogoutButton('#btn-logout', { redirect: '/login.php' });
  ensureFloatingLogout({ redirect: '/login.php' });
});