document.addEventListener('DOMContentLoaded', () => {
  const ticketsBody = document.getElementById('tickets-body');
  const closedTicketsBody = document.getElementById('closed-tickets-body');
  const searchInput = document.getElementById('search-tickets');
  const statusFilter = document.getElementById('status-filter');
  const priorityFilter = document.getElementById('priority-filter');
  const categoryFilter = document.getElementById('category-filter');
  const statTotal = document.getElementById('total-tickets');
  const statOpen = document.getElementById('open-tickets');
  const statInProgress = document.getElementById('in-progress-tickets');
  const statClosed = document.getElementById('closed-tickets');
  const statTotalTime = document.getElementById('time-tickets'); // Neu: Gesamtzeit Anzeige

  searchInput.addEventListener('input', refreshTickets);
  statusFilter.addEventListener('change', refreshTickets);
  priorityFilter.addEventListener('change', refreshTickets);
  categoryFilter.addEventListener('change', refreshTickets);

  // Helper: Status/Priority zu "Title-Case-With-Dash"
  function toTitleCaseWithDash(str) {
    return str
      .split(' ')
      .map(word => word.charAt(0).toUpperCase() + word.slice(1).toLowerCase())
      .join('-');
  }

  async function fetchTickets() {
    try {
      const res = await fetch('/api/tickets');
      return await res.json();
    } catch (err) {
      console.error('Error fetching tickets:', err);
      return [];
    }
  }

  async function deleteTicket(id) {
    try {
      const res = await fetch(`/api/tickets/${id}`, {
        method: 'DELETE',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ actor: 'Admin' })
      });
      return await res.json();
    } catch (err) {
      console.error('Error deleting ticket:', err);
    }
  }

  async function refreshTickets() {
    const tickets = await fetchTickets();
    renderTickets(tickets);
    updateStats(tickets);
  }

  function renderTickets(tickets) {
    const status = statusFilter.value;
    const priority = priorityFilter.value;
    const category = categoryFilter.value;
    const searchTerm = searchInput.value.toLowerCase();

    const filtered = tickets.filter(t =>
      (status === 'all' || t.status === status) &&
      (priority === 'all' || t.priority === priority) &&
      (category === 'all' || t.category === category) &&
      (t.title.toLowerCase().includes(searchTerm) ||
        t.description.toLowerCase().includes(searchTerm) ||
        t.requester.toLowerCase().includes(searchTerm))
    ).sort((a, b) => new Date(b.created_at) - new Date(a.created_at));

    const openRows = [];
    const closedRows = [];

    filtered.forEach(ticket => {
      const shortTitle = ticket.title.length > 50 ? ticket.title.slice(0, 50) + '...' : ticket.title;

      // Wandle Status und Priority korrekt in Klassen um
      const statusClass = toTitleCaseWithDash(ticket.status || 'Unknown');
      const priorityClass = toTitleCaseWithDash(ticket.priority || 'None');

      const rowHTML = `
        <tr>
          <td>${ticket.id}</td>
          <td class="ticket-title">${shortTitle}</td>
          <td>${ticket.requester}</td>
          <td>${ticket.category || '-'}</td>
          <td><span class="status-badge status-${statusClass}">${ticket.status || 'Unknown'}</span></td>
          <td><span class="priority-badge priority-${priorityClass}">${ticket.priority || 'None'}</span></td>
          <td>${formatDate(ticket.created_at)}</td>
          <td>${ticket.total_time} min</td>
          <td class="table-actions">
            <button class="table-btn view-btn" data-id="${ticket.id}"><i class="fas fa-eye"></i></button>
            <button class="table-btn delete-btn" data-id="${ticket.id}"><i class="fas fa-trash-alt"></i></button>
          </td>
        </tr>`;

      if (ticket.status === 'Closed') {
        closedRows.push(rowHTML);
      } else {
        openRows.push(rowHTML);
      }
    });

    ticketsBody.innerHTML = openRows.length
      ? openRows.join('')
      : `<tr><td colspan="8" class="empty-table">No open tickets found</td></tr>`;

    if (closedTicketsBody) {
      closedTicketsBody.innerHTML = closedRows.length
        ? closedRows.join('')
        : `<tr><td colspan="8" class="empty-table">No closed tickets</td></tr>`;
    }

    // Event listeners an Buttons hängen
    [...document.querySelectorAll('.view-btn')].forEach(btn =>
      btn.addEventListener('click', () => {
        window.location.href = `/ticketview/ticket-view-admin.html?id=${btn.dataset.id}`;
      })
    );

    [...document.querySelectorAll('.delete-btn')].forEach(btn =>
      btn.addEventListener('click', () => {
        if (confirm('Are you sure you want to delete this ticket?')) {
          deleteTicket(btn.dataset.id).then(refreshTickets);
        }
      })
    );
  }

  function updateStats(tickets) {
    statTotal.textContent = tickets.length;
    statOpen.textContent = tickets.filter(t => t.status === 'Open').length;
    statInProgress.textContent = tickets.filter(t => t.status === 'In Progress').length;
    statClosed.textContent = tickets.filter(t => t.status === 'Closed').length;

    // Gesamtzeit aller Tickets summieren (total_time in Minuten)
    const totalTime = tickets.reduce((sum, ticket) => sum + (ticket.total_time || 0), 0);
    statTotalTime.textContent = `${totalTime} min`;
  }

  function formatDate(date) {
    return new Date(date).toLocaleDateString(undefined, {
      year: 'numeric',
      month: 'short',
      day: 'numeric'
    });
  }

  refreshTickets();
});