Untitled

#### 1 ####
## Inventory ##

class Product

  attr_accessor :name, :price

  def initialize(name, price)
    @name = name
    @price = price
  end

end

iPod = Product.new('iPod', 229.00)
iMac = Product.new('iMac', 1199.00)
iPhone = Product.new('iPhone', 49.00)


# #### 2 ####
# ## Add to cart ##

class Item

  attr_accessor :name, :quantity

  def initialize(name, quantity)
    @name = name
    @quantity = quantity
  end

end

class Cart

  attr_accessor :products

  def initialize
    @products = []
  end

  def add_to_cart(product, quantity=1)
    i = self.products.index { |x| x.name == product }
    i.nil? ? @products << Item.new(product, quantity) : self.products[i].quantity += quantity
  end

end

cart = Cart.new()
second_cart = Cart.new()

cart.add_to_cart(iMac, 5)
cart.add_to_cart(iPhone)
cart.add_to_cart(iPod, 2)

second_cart.add_to_cart(iMac,2)
second_cart.add_to_cart(iPod)
second_cart.add_to_cart(iPod)
second_cart.add_to_cart(iPhone,5)

# get the list of product in both carts
list = (cart.products + second_cart.products).collect { |x| x.name }.uniq
# go through the list and create a new cart using the quantities from both carts
tot_cart = Cart.new()
list.each { |x|
  c = cart.products.index { |p| p.name == x }
  q1 = c ? cart.products[c].quantity : 0
  sc = second_cart.products.index { |p| p.name == x }
  q2 = sc ? second_cart.products[sc].quantity : 0
  tot_cart.add_to_cart(x, q1+q2)
  }

puts tot_cart.inspect


# #### 3 ####
# # Purchase details ##
#
#cart.items.each do |item|
#  puts "#{item.product} - #{item.quantity} - #{item.price} US$"
#end
#
# #### 4 ####
# # Sum total value in the cart ##

#puts "The total of your shopping cart is: #{cart.total_cart_value}"
#
# #### 5 ####
# ## Discounts: iPods 2 x 1, iMac => (iPhone - 20%) ##
# puts "You are qualified for the discounted amount of: $#{cart.discount}."
# puts "The total of your purchase is $#{cart.total}."
#