function solve() {
  const [generateBtn, buyBtn] = Array.from(document.querySelectorAll('button'));
  const [input, output] = Array.from(document.querySelectorAll('textarea'));
  const tbody = document.querySelector('tbody');

  generateBtn.addEventListener('click', generate);
  buyBtn.addEventListener('click', buy);

  const items = []; // closure

  function buy() {
    let list = [];
    let total = 0;
    let decoration = 0;
    let bought = items.filter((i) => i.isChecked());

    for (let item of bought) {
      list.push(item.name);
      total += Number(item.price);
      decoration += Number(item.decFactor);
    }
    decoration /= bought.length;

    output.value = [
      `Bought furniture: ${list.join(', ')}`,
      `Total price: ${total.toFixed(2)}`,
      `Average decoration factor: ${decoration}`,
    ].join('\n');
  }

  function generate() {
    const data = JSON.parse(input.value);

    for (let item of data) {
      const row = document.createElement('tr');

      row.appendChild(createColumn('img', item.img)); // Image column
      row.appendChild(createColumn('p', item.name)); // Name column
      row.appendChild(createColumn('p', item.price)); // Price column
      row.appendChild(createColumn('p', item.decFactor)); // Decoration column

      // Input column
      const c5 = document.createElement('td');
      const checkbox = document.createElement('input');
      checkbox.type = 'checkbox';
      c5.appendChild(checkbox);
      row.appendChild(c5);

      tbody.appendChild(row);

      items.push({
        ...item,
        isChecked,
      });

      function isChecked() {
        return checkbox.checked;
      }
    }
  }

  function createColumn(type, content) {
    const result = document.createElement('td');
    let inner;

    if (type == 'img') {
      inner = document.createElement('img');
      inner.src = content;
    } else {
      inner = document.createElement('p');
      inner.textContent = content;
    }
    result.appendChild(inner);
    return result;
  }
}