# thanks to Eric Davis for the base lottery code http://gist.github.com/164109
require 'ostruct'
 
class BugMashLottery
  PRIZE_LIMIT = 1
 
  attr_accessor :tickets
 
  # http://wiki.railsbridge.org/projects/railsbridge/wiki/BugMash
  def prizes
    [
     OpenStruct.new(:sponsor => "Mike Gunderloy", :prize => "Rails Rescue Handbook"),
     OpenStruct.new(:sponsor => "Mike Gunderloy", :prize => "Rails Freelancing Handbook"),
     OpenStruct.new(:sponsor => "Blue Box Group", :prize => "1 TB Time Capsule courtesy"),
     OpenStruct.new(:sponsor => "Less Everything", :prize => "1 Annual Subscription to Less Accounting"),
     OpenStruct.new(:sponsor => "Less Everything", :prize => "1 Annual Subscription to Less Time Spent"),
     OpenStruct.new(:sponsor => "Peepcode Screencasts", :prize => "1 Credit"),
     OpenStruct.new(:sponsor => "Peepcode Screencasts", :prize => "1 Credit"),
     OpenStruct.new(:sponsor => "Little Stream Software", :prize => '1 set of books "Producing Open Source Software: How to Run a Successful Free Software Project" and "The Art of Community: Building the New Age of Participation'),
     OpenStruct.new(:sponsor => "EngineYard", :prize => "1 Tee Shirt"),
     OpenStruct.new(:sponsor => "EngineYard", :prize => "1 Tee Shirt"),
    ]
  end
 
  def bugmash_participants
    { 
      'Elad Meidar' => 2950,
      'John Trupiano' => 2375,
      'sr.iniv.t' => 2125,
      'Jay Pignata' => 2000,
      'Matías Flores' => 1750,
      'Elomar França' => 1550,
      'John Pignata' => 1000,
      'Luciano G Panaro' => 1000,
      'Matias Flores' => 1000,
      'Gaius Centus Novus' => 700,
      'Blue Box Jesse' => 625,
      'hsume2' => 450,
      'Blue Box Stephen' => 450,
      'Robert Rouse' => 375,
      'Joe Van Dyk' => 375,
      'Kieran P' => 325,
      'dira' => 325,
      'David Trasbo' => 300,
      'Akira Matsuda' => 300,
      'hsume2 (Henry)' => 275,
      'Mike Enriquez' => 225,
      'Lena Herrmann' => 175,
      'John Guenin' => 175,
      'Blue Box Chris' => 175,
      'Daniel Hofstetter' => 175,
      'Ken Richard' => 150,
      'kolo' => 150,
      'rbxbx' => 125,
      'Lawrence Pit' => 125,
      'Pat Allan' => 100,
      'Chad Woolley' => 100,
      'jroes' => 100,
      'Jordan Brough' => 100,
      'Erik Ostrom' => 75,
      'andhapp' => 75,
      'Ed Schmalzle' => 75,
      'luciano.panaro' => 75,
      'Elise Huard' => 75,
      'rishav' => 75,
      'MOROHASHI Kyosuke' => 75,
      'Ben Woodcroft' => 50,
      'Alex Kahn' => 50,
      'Eloy Duran' => 50,
      'Sam Ruby' => 50,
      'John Woods' => 50,
      'Nikolai Lugovoi' => 50,
      'Claudio Poli' => 50,
      'Josh Sharpe' => 25,
      'Jakub Kuźma' => 25,
      'Matt Jones' => 25,
      'qmx' => 25,
      'cohitre' => 25,
      'Stephen Blackstone' => 25
    }
  end
 
  def generate_tickets(participants)
    tickets = []
    participants.each do |participant, points|
      number_of_tickets = (points.to_f / 100.0).ceil
 
      (1..number_of_tickets).each do
        tickets << participant
      end
    end
    @tickets = tickets.sort_by {rand}
  end
 
  def pull_winners(participants=nil)
    participants ||= bugmash_participants
    generate_tickets(participants)
    winners = []
    prizes.each do |prize|
      lucky_winner = @tickets.pop
      while has_already_won_prize_from_sponsor?(lucky_winner, prize, winners)
        put_ticket_back_in_lottery(lucky_winner)
        lucky_winner = @tickets.pop
      end
      winners << OpenStruct.new(:participant => lucky_winner, :prize => prize)
      remove_participant_from_lottery(lucky_winner) if has_reached_prize_limit?(lucky_winner, winners)
    end
    winners
  end
 
  def remove_participant_from_lottery(participant)
    @tickets = @tickets.reject {|p| p == participant}
  end
 
  def has_reached_prize_limit?(participant, winners)
    prize_count = winners.select {|winner| winner.participant == participant}
    prize_count.size == PRIZE_LIMIT
  end
 
  def has_already_won_prize_from_sponsor?(participant, prize, winners)
    winners.select {|winner| winner.participant == participant}.detect {|winner| winner.prize.sponsor == prize.sponsor}
  end
 
  def put_ticket_back_in_lottery(ticket)
    @tickets.insert(rand(@tickets.size - 1), ticket)
  end
 
  def run_lottery
    pull_winners.each do |winner|
      puts "#{winner.participant} has won #{winner.prize.prize} from #{winner.prize.sponsor}"
    end
  end
end