vue-storefront/core/lib/taxcalc.js

A Vue.js, PWA eCommerce frontend

export function calculateProductTax (product, taxClasses, taxCountry = 'PL', taxRegion = '') {
  let rateFound = false
  let taxClass = taxClasses.find((el) => el.product_tax_class_ids.indexOf(parseInt(product.tax_class_id) >= 0))
  if (taxClass) {
    for (let rate of taxClass.rates) { // TODO: add check for zip code ranges (!)
      if (rate.tax_country_id === taxCountry && (rate.region_name === taxRegion || rate.tax_region_id === 0 || !rate.region_name)) {
        product.price = parseFloat(product.price)
        product.priceInclTax = (product.price + product.price * (parseFloat(rate.rate) / 100))
        product.priceTax = (product.price * (parseFloat(rate.rate) / 100))

        product.special_price = parseFloat(product.special_price)
        product.specialPriceInclTax = (parseFloat(product.special_price) + parseFloat(product.special_price) * (parseFloat(rate.rate) / 100))
        product.specialPriceTax = (parseFloat(product.special_price) * (parseFloat(rate.rate) / 100))

        if (product.special_price && (product.special_price < product.price)) {
          product.originalPrice = product.price
          product.originalPriceInclTax = product.priceInclTax
          product.originalPriceTax = product.priceTax

          product.price = parseFloat(product.special_price)
          product.priceInclTax = product.specialPriceInclTax
          product.priceTax = product.specialPriceTax
        } else {
          product.special_price = 0 // the same price as original; it's not a promotion
        }

        if (product.configurable_children) {
          for (let configurableChild of product.configurable_children) {
            if (configurableChild.custom_attributes) {
              for (let opt of configurableChild.custom_attributes) {
                configurableChild[opt.attribute_code] = opt.value
              }
            }
            configurableChild.price = parseFloat(configurableChild.price)
            configurableChild.priceInclTax = (configurableChild.price + configurableChild.price * (parseFloat(rate.rate) / 100))
            configurableChild.priceTax = (configurableChild.price * (parseFloat(rate.rate) / 100))

            configurableChild.specialPriceInclTax = (parseFloat(configurableChild.special_price) + parseFloat(configurableChild.special_price) * (parseFloat(rate.rate) / 100))
            configurableChild.specialPriceTax = (parseFloat(configurableChild.special_price) * (parseFloat(rate.rate) / 100))

            if (configurableChild.special_price && (configurableChild.special_price < configurableChild.price)) {
              configurableChild.originalPrice = parseFloat(configurableChild.price)
              configurableChild.originalPriceInclTax = configurableChild.priceInclTax
              configurableChild.originalPriceTax = configurableChild.priceTax

              configurableChild.price = parseFloat(configurableChild.special_price)
              configurableChild.priceInclTax = configurableChild.specialPriceInclTax
              configurableChild.priceTax = configurableChild.specialPriceTax
            } else {
              configurableChild.special_price = 0
            }

            if (configurableChild.priceInclTax < product.priceInclTax || product.price === 0) { // always show the lowest price
              product.priceInclTax = parseFloat(configurableChild.priceInclTax)
              product.priceTax = parseFloat(configurableChild.priceTax)
              product.price = parseFloat(configurableChild.price)
              product.special_price = parseFloat(configurableChild.special_price)
              product.specialPriceInclTax = configurableChild.specialPriceInclTax
              product.specialPriceTax = configurableChild.specialPriceTax
              product.originalPrice = configurableChild.originalPrice
              product.originalPriceInclTax = configurableChild.originalPriceInclTax
              product.originalPriceTax = configurableChild.originalPriceTax
            }
          }
        }
        rateFound = true
        console.debug('Tax rate ' + rate.code + ' = ' + rate.rate + '% found for ' + taxCountry + ' / ' + taxRegion)
        break
      }
    }
  }
  if (!rateFound) {
    console.log('No such tax class id: ' + product.tax_class_id + ' or rate not found for ' + taxCountry + ' / ' + taxRegion)
    product.priceInclTax = product.price
    product.priceTax = 0
    product.specialPriceInclTax = 0
    product.specialPriceTax = 0
    if (product.configurable_children) {
      for (let configurableChildren of product.configurable_children) {
        configurableChildren.priceInclTax = configurableChildren.price
        configurableChildren.priceTax = 0
        configurableChildren.specialPriceInclTax = 0
        configurableChildren.specialPriceTax = 0
      }
    }
  }
}