document.addEventListener('DOMContentLoaded', () => {
  fetch('data.json')
    .then(r => r.json())
    .then(data => {
      renderMenu(data.menu);
      renderShopping(data.shopping);
    })
    .catch(err => console.error('Ошибка загрузки данных:', err));
});

// ---- Меню -------------------------------------------------
function renderMenu(menu) {
  const tbody = document.querySelector('#menu-table tbody');
  menu.forEach(item => {
    const tr = document.createElement('tr');
    const tdDay = document.createElement('td');
    tdDay.textContent = item.day;
    const tdBreak = document.createElement('td');
    tdBreak.textContent = `${item.breakfast} (${item.breakfast_kcal} ккал)`;
    const tdLunch = document.createElement('td');
    tdLunch.textContent = `${item.lunch} (${item.lunch_kcal} ккал)`;
    const tdDinner = document.createElement('td');
    tdDinner.textContent = `${item.dinner} (${item.dinner_kcal} ккал)`;
    const tdSnack = document.createElement('td');
    tdSnack.textContent = `${item.snack || ''} (${item.snack_kcal || 0} ккал)`;
    const tdCoffee = document.createElement('td');
    tdCoffee.textContent = `${item.coffee || ''} (${item.coffee_kcal || 0} ккал)`;
    const tdTea = document.createElement('td');
    tdTea.textContent = `${item.tea || ''} (${item.tea_kcal || 0} ккал)`;
    const tdTotal = document.createElement('td');
    const totalKcal = (item.breakfast_kcal || 0) + (item.lunch_kcal || 0) + (item.dinner_kcal || 0) + (item.snack_kcal || 0) + (item.coffee_kcal || 0) + (item.tea_kcal || 0);
    tdTotal.textContent = `${totalKcal} ккал`;
    const tdGrams = document.createElement('td');
    tdGrams.textContent = `${item.grams || ''} г`;
    tr.append(tdDay, tdBreak, tdLunch, tdDinner, tdSnack, tdCoffee, tdTea, tdTotal, tdGrams);
    tbody.appendChild(tr);
  });
}

// ---- План покупок ------------------------------------------
function renderShopping(weeks) {
  // сохраняем данные для экспорта
  window._shoppingData = weeks;
  const container = document.getElementById('weeks');
  weeks.forEach(week => {
    const weekDiv = document.createElement('div');
    weekDiv.className = 'week';
    const header = document.createElement('div');
    header.className = 'week-header';
    header.textContent = `Неделя ${week.week}`;
    const itemsDiv = document.createElement('div');
    itemsDiv.className = 'week-items';
    itemsDiv.style.display = 'none';
    header.addEventListener('click', () => {
      itemsDiv.style.display = itemsDiv.style.display === 'none' ? 'block' : 'none';
    });
    // таблица категорий
    const table = document.createElement('table');
    const tbody = document.createElement('tbody');
    week.items.forEach(cat => {
      const trCat = document.createElement('tr');
      const tdCat = document.createElement('td');
      tdCat.colSpan = 2;
      tdCat.style.fontWeight = 'bold';
      tdCat.textContent = cat.category;
      trCat.appendChild(tdCat);
      tbody.appendChild(trCat);
      cat.items.forEach(it => {
        const tr = document.createElement('tr');
        const tdName = document.createElement('td');
        const tdQty = document.createElement('td');
        tdName.textContent = it.name;
        tdQty.textContent = it.qty;
        tr.append(tdName, tdQty);
        tbody.appendChild(tr);
      });
    });
    table.appendChild(tbody);
    itemsDiv.appendChild(table);
    weekDiv.appendChild(header);
    weekDiv.appendChild(itemsDiv);
    container.appendChild(weekDiv);
  });
}

// ---- Экспорт в CSV (Excel) --------------------------------
function exportToCsv() {
  if (!window._shoppingData) return;
  let csv = '\uFEFFWeek,Category,Item,Qty\n';
  window._shoppingData.forEach(week => {
    week.items.forEach(cat => {
      cat.items.forEach(it => {
        csv += `${week.week},${cat.category},${it.name},${it.qty}\n`;
      });
    });
  });
  const blob = new Blob([csv], { type: 'text/csv;charset=utf-8;' });
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url;
  a.download = 'shopping_plan.csv';
  a.style.display = 'none';
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  URL.revokeObjectURL(url);
}

document.getElementById('exportBtn').addEventListener('click', exportToCsv);