obj_to_func_2.rb

class AuctionHouse
  attr_accessor :items, :total_sales
  
  def initialize(items)
    @items = items
    @total_sales = 0
  end
  
  def run_auction(bid_list)
    handle_bid_list(bid_list)
    finalize_sales
  end
  
  def announce_status
    announce_items
    announce_sales
  end
  
  private

  def handle_bid_list(bid_list)
    bid_list.each { |item, amount| handle_bid(item, amount) }
  end
  
  def handle_bid(item, amount)
    if item_exists?(item) && accept_bid?(item, amount)
      @items[item] = amount
    end
  end
  
  def item_exists?(item)
    @items.has_key?(item)
  end
  
  def accept_bid?(item, amount)
    @items[item].nil? || amount > @items[item]
  end
    
  def finalize_sales
    calculate_total_sales
    remove_sold_items
  end
  
  def calculate_total_sales
    @items.each_pair do |item, amount|
      @total_sales += amount unless amount.nil?
    end
  end
  
  def remove_sold_items
    @items = @items.select { |item, amount| @items[item].nil? }
  end
  
  def announce_items
    puts "Available items: "
    @items.keys.each_with_index { |item, idx| puts "#{idx + 1}: #{item}" }
  end
  
  def announce_sales
    puts "Total sales: #{dollarize_sales}"
  end

  def dollarize_sales
    "$" + @total_sales.to_s.reverse.scan(/.{1,3}/).join(",").reverse
  end
end

paintings = { "Night Watch" => nil, "American Gothic" => nil, "Tower of Babel" => nil,
              "Friend In Need" => nil, "Potato Eaters" => nil, "Red Balloon" => nil }
auction_house = AuctionHouse.new(paintings)

bids = [["Night Watch", 550000], ["Night Watch", 700000], ["American Gothic", 145000],
        ["Friend In Need", 180000], ["Potato Eaters", 240000], ["Potato Eaters", 300000],
        ["Red Balloon", 1500000], ["Red Balloon", 25], ["Red Balloon", 1800000]]

auction_house.announce_status
  # Available items: 
  # 1: Night Watch
  # 2: American Gothic
  # 3: Tower of Babel
  # 4: Friend In Need
  # 5: Potato Eaters
  # 6: Red Balloon
  # Total sales: $0

auction_house.run_auction(bids)

auction_house.announce_status
  # Available items: 
  # 1: Tower of Babel
  # Total sales: $3,125,000