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Contents
module ActiveMerchant
module Shipping
class ShipmentPacker
class OverweightItem < StandardError
end
# items - array of hashes containing quantity, grams and price.
# ex. [{:quantity => 2, :price => 1.0, :grams => 50}]
# dimensions - [5.0, 15.0, 30.0]
# maximum_weight - maximum weight in grams
# currency - ISO currency code
def self.pack(items, dimensions, maximum_weight, currency)
packages = []
return packages if items.empty?
items = items.map(&:symbolize_keys).map { |item| [item] * item[:quantity].to_i }.flatten
state = :package_empty
while state != :packing_finished
case state
when :package_empty
package_weight, package_value = 0, 0
state = :filling_package
when :filling_package
item = items.shift
item_weight, item_price = item[:grams].to_i, Package.cents_from(item[:price])
if item_weight > maximum_weight
raise OverweightItem, "The item with weight of #{item_weight}g is heavier than the allowable package weight of #{maximum_weight}g"
end
if (package_weight + item_weight) <= maximum_weight
package_weight += item_weight
package_value += item_price
state = :package_full if items.empty?
else
items.unshift(item)
state = :package_full
end
when :package_full
packages << ActiveMerchant::Shipping::Package.new(package_weight, dimensions, :value => package_value, :currency => currency)
state = items.any? ? :package_empty : :packing_finished
end
end
packages
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems