function solve () {
  let textAreaElements = document.getElementsByTagName('textarea')
  let buttonsElement = document.getElementsByTagName('button')
  let tbody = document.getElementsByTagName('tbody')[0]

  document.getElementsByTagName('input')[0].disabled = false
  buttonsElement[0].addEventListener('click', generate)
  buttonsElement[1].addEventListener('click', buy)

  function generate () {
    let furnitureListInput = JSON.parse(textAreaElements[0].value)
    for (let i = 0; i < furnitureListInput.length; i++) {
      let table = document.getElementsByTagName('tr')[1].cloneNode(true)
      addFurniture(furnitureListInput[i], table)
    }
  }

  function addFurniture (furniture, table) {
    table.getElementsByTagName('img')[0].src = furniture['img']
    table.getElementsByTagName('p')[0].textContent = furniture['name']
    table.getElementsByTagName('p')[1].textContent = furniture['price']
    table.getElementsByTagName('p')[2].textContent = furniture['decFactor']
    tbody.appendChild(table)
  }

  function buy () {
    let furniture = []
    let totalPrice = 0
    let averageFactor = 0
    let checkbox = Array.from(document.getElementsByTagName('input'))
    for (let i = 0; i < checkbox.length; i++) {
      if (checkbox[i].checked) {
        let tableElements = checkbox[i].parentElement.parentElement
        let name = tableElements.getElementsByTagName('p')[0].textContent
        furniture.push(name)
        let price = tableElements.getElementsByTagName('p')[1].textContent
        totalPrice += +price
        let decFactor = tableElements.getElementsByTagName('p')[2].textContent
        averageFactor += +decFactor
      }
    }
    document.getElementsByTagName(
      'textarea'
    )[1].value += `Bought furniture: ${furniture.join(', ')}\n`
    document.getElementsByTagName(
      'textarea'
    )[1].value += `Total price: ${totalPrice.toFixed(2)}\n`
    document.getElementsByTagName(
      'textarea'
    )[1].value += `Average decoration factor: ${averageFactor /
      furniture.length}`
  }

  ;(function () {
    let newTr = document.createElement('tr')

    let imgTd = document.createElement('td')
    let imgTag = document.createElement('img')
    imgTd.appendChild(imgTag)

    let productTd = document.createElement('td')
    let productP = document.createElement('p')
    productTd.appendChild(productP)

    let priceTd = document.createElement('td')
    let priceP = document.createElement('p')
    priceTd.appendChild(priceP)

    let decFacTd = document.createElement('td')
    let decFacP = document.createElement('p')
    decFacTd.appendChild(decFacP)

    let checkBoxTd = document.createElement('td')
    let checkBoxInput = document.createElement('input')
    checkBoxInput.setAttribute('type', 'checkbox')
    checkBoxTd.appendChild(checkBoxInput)

    newTr.appendChild(imgTd)
    newTr.appendChild(productTd)
    newTr.appendChild(priceTd)
    newTr.appendChild(decFacTd)
    newTr.appendChild(checkBoxTd)

    tbody.appendChild(newTr)
  })()
}