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Ruby Test Cart
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require 'bigdecimal' | |
class Item | |
attr_accessor :code, :name, :price | |
def initialize(code, name, price) | |
@code = code | |
@name = name | |
@price = BigDecimal.new("#{price}") | |
end | |
end | |
class Promotion | |
def initialize | |
@promo_rules = Hash.new | |
end | |
def add_promotion_rule(name, rule) | |
@promo_rules[name] = rule | |
end | |
def remove_promotion_rule(name) | |
if @promo_rules.has_key?(name) | |
@promo_rules.delete(name) | |
else | |
puts "Promo rule not found" | |
end | |
end | |
def promo_rules | |
@promo_rules | |
end | |
end | |
class Checkout | |
def initialize(promotional_rules) | |
@cart = [] | |
@promo_rules = promotional_rules.promo_rules #ugly | |
@cart_total = BigDecimal.new(0) | |
end | |
def scan(*item) | |
item.each {|item| @cart << item } | |
end | |
def apply_promo_rules | |
puts @promo_rules.to_s | |
@promo_rules.each_pair do |name,rule| | |
rule.call @cart | |
end | |
end | |
#This will shave trailing zeros but Rails has helpers for currency | |
def total | |
self.apply_promo_rules | |
@cart.each { |item| cart_total =+ item.price } | |
@cart_total.to_s | |
end | |
def cart | |
@cart | |
end | |
end | |
#Test run | |
item1 = Item.new('001', "Lavender heart", 9.25) | |
item2 = Item.new('002', "Personalised cufflinks", 45.00) | |
item3 = Item.new('003', "Kids T-Shirt", 19.95) | |
promotional_rules = Promotion.new | |
ten_percent_discount_over_sixty = Proc.new { | |
cart.each { |item| cart_total += item.price } | |
if cart_total >= 60.00 | |
cart_total =- cart_total * 0.1 | |
end | |
} | |
lavender_hearts_discount = Proc.new { | |
count = @cart.each do |item| | |
if item.code == '001' | |
count += 1 | |
end | |
end | |
if count > 1 | |
@cart.each do |item| | |
if item.code == '001' && item.price == 9.25 | |
item.price = 8.50 | |
end | |
end | |
else | |
item.price = 9.25 | |
end | |
} | |
promotional_rules.add_promotion_rule("lavender", lavender_hearts_discount) | |
promotional_rules.add_promotion_rule("ten percent", ten_percent_discount_over_sixty) | |
co = Checkout.new(promotional_rules) | |
co.scan(item1, item2, item3) |
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