/**
 * Dashboard View
 * Shows stats overview, distribution charts, and recent tickets.
 */
const DashboardView = {
  async render() {
    const container = document.getElementById('view-container');
    container.innerHTML = '<div class="loading-screen"><div class="spinner"></div><p>Caricamento dashboard...</p></div>';

    try {
      const stats = await App.api('/api/dashboard/stats');

      const maxByState = Math.max(...(stats.by_state || []).map(s => parseInt(s.count)), 1);
      const maxByPriority = Math.max(...(stats.by_priority || []).map(s => parseInt(s.count)), 1);
      const maxByQueue = Math.max(...(stats.by_queue || []).map(s => parseInt(s.count)), 1);

      container.innerHTML = `
        <!-- Stats Cards -->
        <div class="stats-grid">
          <div class="stat-card accent">
            <div class="stat-label">Ticket Aperti</div>
            <div class="stat-value">${stats.total_open}</div>
          </div>
          <div class="stat-card">
            <div class="stat-label">Creati Oggi</div>
            <div class="stat-value">${stats.created_today}</div>
          </div>
          <div class="stat-card">
            <div class="stat-label">Creati Settimana</div>
            <div class="stat-value">${stats.created_this_week}</div>
          </div>
          <div class="stat-card ${stats.escalated > 0 ? 'danger' : ''}">
            <div class="stat-label">Escalated</div>
            <div class="stat-value">${stats.escalated}</div>
          </div>
        </div>

        <!-- Distributions -->
        <div class="distribution-section">
          <div class="card">
            <div class="card-title">Per Stato</div>
            ${(stats.by_state || []).map(s => `
              <div class="dist-bar-container">
                <div class="dist-bar-header">
                  <span class="dist-bar-label">${s.state}</span>
                  <span class="dist-bar-value">${s.count}</span>
                </div>
                <div class="dist-bar-track">
                  <div class="dist-bar-fill" style="width: ${(parseInt(s.count) / maxByState * 100).toFixed(1)}%"></div>
                </div>
              </div>
            `).join('')}
            ${(stats.by_state || []).length === 0 ? '<p style="color:var(--text-tertiary);font-size:0.85rem;">Nessun dato</p>' : ''}
          </div>

          <div class="card">
            <div class="card-title">Per Priorità</div>
            ${(stats.by_priority || []).map((p, idx) => `
              <div class="dist-bar-container">
                <div class="dist-bar-header">
                  <span class="dist-bar-label">${p.priority}</span>
                  <span class="dist-bar-value">${p.count}</span>
                </div>
                <div class="dist-bar-track">
                  <div class="dist-bar-fill" style="width: ${(parseInt(p.count) / maxByPriority * 100).toFixed(1)}%; background: linear-gradient(90deg, var(--priority-${idx + 1}-text, var(--accent-primary)), var(--accent-secondary));"></div>
                </div>
              </div>
            `).join('')}
            ${(stats.by_priority || []).length === 0 ? '<p style="color:var(--text-tertiary);font-size:0.85rem;">Nessun dato</p>' : ''}
          </div>

          <div class="card">
            <div class="card-title">Per Coda (Top 10)</div>
            ${(stats.by_queue || []).map(q => `
              <div class="dist-bar-container">
                <div class="dist-bar-header">
                  <span class="dist-bar-label">${q.queue}</span>
                  <span class="dist-bar-value">${q.count}</span>
                </div>
                <div class="dist-bar-track">
                  <div class="dist-bar-fill" style="width: ${(parseInt(q.count) / maxByQueue * 100).toFixed(1)}%"></div>
                </div>
              </div>
            `).join('')}
            ${(stats.by_queue || []).length === 0 ? '<p style="color:var(--text-tertiary);font-size:0.85rem;">Nessun dato</p>' : ''}
          </div>
        </div>

        <!-- Recent Tickets -->
        <div class="card">
          <div class="card-title">Ticket Recenti</div>
          ${(stats.recent_tickets || []).length > 0 ? `
            <table class="recent-tickets-table">
              <thead>
                <tr>
                  <th>Numero</th>
                  <th>Titolo</th>
                  <th>Stato</th>
                  <th>Priorità</th>
                  <th>Coda</th>
                  <th>Data</th>
                </tr>
              </thead>
              <tbody>
                ${stats.recent_tickets.map(t => `
                  <tr onclick="window.location.hash='#/tickets/${t.id}'">
                    <td><span class="ticket-tn">${t.tn}</span></td>
                    <td class="ticket-title-cell">${App.escapeHtml(t.title || '')}</td>
                    <td><span class="badge badge-state" data-state-type="${(t.state_name || '').toLowerCase()}">${t.state_name}</span></td>
                    <td><span class="badge badge-priority" data-priority="${t.priority_name ? App.priorityIndex(t.priority_name) : 3}">${t.priority_name}</span></td>
                    <td><span class="badge badge-queue">${t.queue_name}</span></td>
                    <td style="color:var(--text-tertiary);font-size:0.78rem;">${App.formatDate(t.create_time)}</td>
                  </tr>
                `).join('')}
              </tbody>
            </table>
          ` : `
            <div class="empty-state">
              <div class="empty-state-icon">📭</div>
              <div class="empty-state-text">Nessun ticket recente</div>
            </div>
          `}
        </div>
      `;

      // Animate bars after render
      requestAnimationFrame(() => {
        document.querySelectorAll('.dist-bar-fill').forEach(bar => {
          const w = bar.style.width;
          bar.style.width = '0%';
          requestAnimationFrame(() => { bar.style.width = w; });
        });
      });

      // Update open ticket count in sidebar badge
      const badge = document.getElementById('open-ticket-count');
      if (badge && stats.total_open > 0) {
        badge.textContent = stats.total_open;
      }

    } catch (err) {
      container.innerHTML = `
        <div class="empty-state">
          <div class="empty-state-icon">⚠️</div>
          <div class="empty-state-text">Errore caricamento dashboard</div>
          <div class="empty-state-sub">${App.escapeHtml(err.message)}</div>
        </div>
      `;
    }
  },
};