const mobileToggle = document.getElementById('mobileToggle')
    const mobilePanel = document.getElementById('mobilePanel')
    const cartDrawer = document.getElementById('cartDrawer')
    const cartOpenButton = document.getElementById('cartOpenButton')
    const mobileCartOpenButton = document.getElementById('mobileCartOpenButton')
    const cartCloseButton = document.getElementById('cartCloseButton')
    const modalBackdrop = document.getElementById('orderModal')
    const modalCloseButton = document.getElementById('modalCloseButton')
    const viewCartButton = document.getElementById('viewCartButton')
    const checkoutButton = document.getElementById('checkoutButton')
    const orderButtons = document.querySelectorAll('[data-open-order]')
    const addToCartButtons = document.querySelectorAll('.add-to-cart')
    const faqItems = document.querySelectorAll('.faq-item')
    const cartCount = document.getElementById('cartCount')
    const mobileCartCount = document.getElementById('mobileCartCount')
    const cartItemsCount = document.getElementById('cartItemsCount')
    const cartTotal = document.getElementById('cartTotal')
    const cartList = document.getElementById('cartList')
    const orderForm = document.getElementById('orderForm')
    const contactForm = document.getElementById('contactForm')
    const orderItemsField = document.getElementById('orderItemsField')
    const orderSuccess = document.getElementById('orderSuccess')
    const contactSuccess = document.getElementById('contactSuccess')
    const wooCommerceConfig = window.test1WooCommerce || null
    const leadFormConfig = window.test1LeadForm || null
    const cartPageUrl = (wooCommerceConfig && wooCommerceConfig.cartUrl) ? wooCommerceConfig.cartUrl : '/cart/'
    const checkoutPageUrl = (wooCommerceConfig && wooCommerceConfig.checkoutUrl) ? wooCommerceConfig.checkoutUrl : '/checkout/'
    const cartPanel = cartDrawer?.querySelector('.cart-panel')
    const modalCard = modalBackdrop?.querySelector('.modal-card')

    let cart = []
    let lastCartTrigger = null
    let lastModalTrigger = null

    const getFocusableElements = container => {
      if (!container) {
        return []
      }

      return Array.from(container.querySelectorAll('a[href], button:not([disabled]), textarea:not([disabled]), input:not([disabled]), select:not([disabled]), [tabindex]:not([tabindex="-1"])'))
        .filter(element => !element.hasAttribute('hidden') && !element.closest('[hidden]'))
    }

    const focusFirstElement = container => {
      const [first] = getFocusableElements(container)

      if (first) {
        first.focus()
      }
    }

    const openMobileMenu = () => {
      mobilePanel.classList.add('active')
      mobileToggle.setAttribute('aria-expanded', 'true')
      document.body.classList.add('menu-open')
    }

    const closeMobileMenu = () => {
      mobilePanel.classList.remove('active')
      mobileToggle.setAttribute('aria-expanded', 'false')
      document.body.classList.remove('menu-open')
    }

    const openCart = triggerElement => {
      lastCartTrigger = triggerElement || document.activeElement
      cartDrawer.classList.add('open')
      cartDrawer.setAttribute('aria-hidden', 'false')
      document.body.classList.add('modal-open')
      focusFirstElement(cartPanel)
    }

    const closeCart = () => {
      const shouldRestoreFocus = cartDrawer.classList.contains('open')
      cartDrawer.classList.remove('open')
      cartDrawer.setAttribute('aria-hidden', 'true')
      document.body.classList.remove('modal-open')

      if (shouldRestoreFocus && lastCartTrigger && typeof lastCartTrigger.focus === 'function') {
        lastCartTrigger.focus()
      }

      lastCartTrigger = null
    }

    const openModal = triggerElement => {
      lastModalTrigger = triggerElement || document.activeElement
      orderItemsField.value = cart.length
        ? cart.map(item => `${item.name} (${item.volume}) - ${item.price} ₽`).join('\n')
        : ''
      modalBackdrop.classList.add('open')
      modalBackdrop.setAttribute('aria-hidden', 'false')
      document.body.classList.add('modal-open')
      focusFirstElement(modalCard)
    }

    const closeModal = () => {
      const shouldRestoreFocus = modalBackdrop.classList.contains('open')
      modalBackdrop.classList.remove('open')
      modalBackdrop.setAttribute('aria-hidden', 'true')
      document.body.classList.remove('modal-open')

      if (shouldRestoreFocus && lastModalTrigger && typeof lastModalTrigger.focus === 'function') {
        lastModalTrigger.focus()
      }

      lastModalTrigger = null
    }

    const renderCart = () => {
      const total = cart.reduce((sum, item) => sum + item.price, 0)
      const count = cart.length

      cartCount.textContent = count
      mobileCartCount.textContent = count
      cartItemsCount.textContent = count
      cartTotal.textContent = `${total} ₽`

      if (!count) {
        cartList.innerHTML = '<div class="empty-state">Корзина пока пуста. Добавьте воду 19 литров, компактные форматы или минеральную воду из каталога.</div>'
        return
      }

      cartList.innerHTML = cart.map((item, index) => `
        <div class="cart-item">
          <div>
            <strong>${item.name}</strong>
            <span>${item.volume} · ${item.price} ₽</span>
          </div>
          <button type="button" data-remove-index="${index}" aria-label="Удалить ${item.name} из корзины">Удалить</button>
        </div>
      `).join('')

      cartList.querySelectorAll('[data-remove-index]').forEach(button => {
        button.addEventListener('click', () => {
          const index = Number(button.dataset.removeIndex)
          cart.splice(index, 1)
          renderCart()
        })
      })
    }

    const submitLeadForm = (formElement, successElement, formType, onSuccess) => {
      if (!formElement || !successElement) {
        return
      }

      formElement.addEventListener('submit', async event => {
        event.preventDefault()

        if (!leadFormConfig?.ajaxUrl || !leadFormConfig?.action || !leadFormConfig?.nonce) {
          window.alert('Форма временно недоступна. Обновите страницу и попробуйте снова.')
          return
        }

        const formData = new window.FormData(formElement)
        formData.append('action', leadFormConfig.action)
        formData.append('nonce', leadFormConfig.nonce)
        formData.append('form_type', formType)

        try {
          const response = await window.fetch(leadFormConfig.ajaxUrl, {
            method: 'POST',
            credentials: 'same-origin',
            body: formData,
          })

          const payload = await response.json().catch(() => null)

          if (!response.ok || !payload?.success) {
            throw new Error('submit_failed')
          }

          successElement.classList.add('visible')
          if (typeof onSuccess === 'function') {
            onSuccess()
          }

          setTimeout(() => {
            formElement.reset()
            successElement.classList.remove('visible')
          }, 2200)
        } catch (error) {
          window.alert('Не удалось отправить заявку. Попробуйте еще раз.')
        }
      })
    }

    mobileToggle.addEventListener('click', () => {
      const isOpen = mobilePanel.classList.contains('active')
      if (isOpen) {
        closeMobileMenu()
        return
      }
      openMobileMenu()
    })

    document.querySelectorAll('.mobile-nav a').forEach(link => {
      link.addEventListener('click', closeMobileMenu)
    })

    addToCartButtons.forEach(button => {
      button.addEventListener('click', () => {
        const productId = Number(button.dataset.productId || 0)

        if (wooCommerceConfig && productId && wooCommerceConfig.addToCartUrl && wooCommerceConfig.checkoutUrl) {
          button.disabled = true

          fetch(wooCommerceConfig.addToCartUrl, {
            method: 'POST',
            headers: {
              'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'
            },
            body: new URLSearchParams({
              product_id: String(productId),
              quantity: '1'
            })
          })
            .then(async response => {
              let payload = null

              try {
                payload = await response.json()
              } catch (error) {
                payload = null
              }

              if (!response.ok) {
                throw new Error('add_to_cart_failed')
              }

              if (payload && payload.error && payload.product_url) {
                window.location.href = payload.product_url
                return
              }

              cart.push({
                name: button.dataset.name,
                volume: button.dataset.volume,
                price: Number(button.dataset.price)
              })
              renderCart()
              openCart(button)
              button.disabled = false
            })
            .catch(() => {
              button.disabled = false
            })

          return
        }

        cart.push({
          name: button.dataset.name,
          volume: button.dataset.volume,
          price: Number(button.dataset.price)
        })
        renderCart()
        openCart(button)
      })
    })

    cartOpenButton.addEventListener('click', () => openCart(cartOpenButton))
    mobileCartOpenButton.addEventListener('click', () => {
      closeMobileMenu()
      openCart(mobileCartOpenButton)
    })
    cartCloseButton.addEventListener('click', closeCart)
    viewCartButton.addEventListener('click', () => {
      window.location.href = cartPageUrl
    })
    checkoutButton.addEventListener('click', () => {
      window.location.href = checkoutPageUrl
    })

    orderButtons.forEach(button => {
      button.addEventListener('click', () => openModal(button))
    })

    modalCloseButton.addEventListener('click', closeModal)

    cartDrawer.addEventListener('click', event => {
      if (event.target === cartDrawer) {
        closeCart()
      }
    })

    modalBackdrop.addEventListener('click', event => {
      if (event.target === modalBackdrop) {
        closeModal()
      }
    })

    faqItems.forEach(item => {
      const trigger = item.querySelector('.faq-question')
      const answer = item.querySelector('.faq-answer')

      if (!trigger || !answer) {
        return
      }

      trigger.addEventListener('click', () => {
        const isOpen = item.classList.contains('open')
        faqItems.forEach(entry => {
          const entryTrigger = entry.querySelector('.faq-question')
          const entryAnswer = entry.querySelector('.faq-answer')

          entry.classList.remove('open')
          entryTrigger?.setAttribute('aria-expanded', 'false')

          if (entryAnswer) {
            entryAnswer.hidden = true
          }
        })
        if (!isOpen) {
          item.classList.add('open')
          trigger.setAttribute('aria-expanded', 'true')
          answer.hidden = false
        }
      })
    })

    submitLeadForm(orderForm, orderSuccess, 'landing_order', () => {
      cart = []
      renderCart()
      setTimeout(() => {
        closeModal()
      }, 700)
    })

    submitLeadForm(contactForm, contactSuccess, 'contacts')

    document.addEventListener('keydown', event => {
      if (event.key !== 'Escape') {
        return
      }
      closeCart()
      closeModal()
      closeMobileMenu()
    })

    renderCart()