let vacations = [];

document.getElementById('vacationForm').addEventListener('submit', function(e) {
  e.preventDefault();
  
  const vacation = {
    id: Date.now(),
    country: document.getElementById('country').value,
    city: document.getElementById('city').value,
    dateFrom: document.getElementById('dateFrom').value,
    dateTo: document.getElementById('dateTo').value,
    budget: document.getElementById('budget').value,
    hotel: document.getElementById('hotel').value,
    tickets: document.getElementById('tickets').value
  };
  
  vacations.push(vacation);
  renderTable();
  this.reset();
});

function renderTable() {
  const tbody = document.getElementById('tableBody');
  const emptyMessage = document.getElementById('emptyMessage');
  const totalCount = document.getElementById('totalCount');
  
  totalCount.textContent = vacations.length;
  
  if (vacations.length === 0) {
    tbody.innerHTML = '';
    emptyMessage.style.display = 'block';
    return;
  }
  
  emptyMessage.style.display = 'none';
  
  tbody.innerHTML = vacations.map(v => {
    const dates = formatDate(v.dateFrom) + ' — ' + formatDate(v.dateTo);
    return `
      <tr>
        <td><strong>${escapeHtml(v.country)}</strong></td>
        <td>${escapeHtml(v.city)}</td>
        <td>${dates}</td>
        <td>$${escapeHtml(v.budget)}</td>
        <td>${escapeHtml(v.hotel) || '—'}</td>
        <td>${escapeHtml(v.tickets) || '—'}</td>
        <td><button class="btn-delete" onclick="deleteVacation(${v.id})">Удалить</button></td>
      </tr>
    `;
  }).join('');
}

function deleteVacation(id) {
  if (confirm('Удалить этот вариант отпуска?')) {
    vacations = vacations.filter(v => v.id !== id);
    renderTable();
  }
}

function formatDate(dateStr) {
  const date = new Date(dateStr);
  return date.toLocaleDateString('ru-RU', { day: 'numeric', month: 'short', year: 'numeric' });
}

function escapeHtml(text) {
  if (!text) return '';
  const div = document.createElement('div');
  div.textContent = text;
  return div.innerHTML;
}

function exportToExcel() {
  if (vacations.length === 0) {
    alert('Сначала добавьте варианты отпуска');
    return;
  }
  
  const headers = ['Страна', 'Город', 'Дата вылета', 'Дата возвращения', 'Бюджет ($)', 'Отель', 'Билеты'];
  const rows = vacations.map(v => [
    v.country,
    v.city,
    v.dateFrom,
    v.dateTo,
    v.budget,
    v.hotel,
    v.tickets
  ]);
  
  const csvContent = '\uFEFF' + [
    headers.join(';'),
    ...rows.map(row => row.map(cell => '"' + String(cell || '').replace(/"/g, '""') + '"').join(';'))
  ].join('\n');
  
  const blob = new Blob([csvContent], { type: 'text/csv;charset=utf-8;' });
  const link = document.createElement('a');
  link.href = URL.createObjectURL(blob);
  link.download = 'otpusk.csv';
  link.click();
}

renderTable();