class Cart
  include Reloadable

  attr_reader :items

  def initialize
    @items = []
  end

  def total_price
    @items.inject(0) { |sum, item| sum + item.price }
  end

  def total_items
    @items.inject(0) { |sum, item| sum + item.quantity }
  end

  def add_product(product)
    current_item = @items.find{|item| item.product == product}
    if current_item
      current_item.increment_quantity
    else
      current_item = CartItem.new(product)
      @items << current_item
    end
    current_item
  end

  def remove_product(product)
    current_item = @items.find{|item| item.product == product}
    if current_item.quantity > 1
      current_item.quantity = current_item.quantity - 1
    elsif current_item.quantity == 1
      @items.delete(current_item)
    end
    current_item
  end

end