merge_products_with_same_id_and_same_grouped_addons.js

merge_products_with_same_id_and_same_grouped_addons.js

function merge_products_with_same_id_and_same_grouped_addons(products) {
  var grouped_products_map_by_same_id_and_same_grouped_addons = {}

  var generate_hash_key_for_grouped_addons = function(addons) {
    if (!addons || !addons.sort) return ''
    addons.sort(function(addon1, addon2){ return addon1.id > addon2.id ? 1 : -1})
    return JSON.stringify(addons)
  }

  var generate_hash_key_for_product = function(product) {
    var product_grouped_addons_hash = generate_hash_key_for_grouped_addons(product.grouped_addons)
    var hash_key = product.id + product_grouped_addons_hash
    return hash_key
  }

  products.forEach(function(product) {
    let hash_key = generate_hash_key_for_product(product)
    let group = grouped_products_map_by_same_id_and_same_grouped_addons[hash_key] || []
    group.push(product)
    grouped_products_map_by_same_id_and_same_grouped_addons[hash_key] = group
  });
  
  var clone = function(obj) {
    return JSON.parse(JSON.stringify(obj))
  }

  var merge_products = function(products) {
    var last_product = products[products.length-1]
    var last_grouped_addons = last_product.grouped_addons
    var total_price = products.reduce(function(prev, product) {
      return prev + (Number(product.price) || 0)
    }, 0)
    var result = clone(last_product)
    result.price = total_price
    return result
  }

  var result = Object.keys(grouped_products_map_by_same_id_and_same_grouped_addons).map(function(key) {
    let group_products = grouped_products_map_by_same_id_and_same_grouped_addons[key]
    return merge_products(group_products)
  })

  return result
}