ensl.org/app/models/contest.rb

class Contest < ActiveRecord::Base
  include Extra

  WEIGHT = 30.0
  STATUS_OPEN = 0
  STATUS_PROGRESS = 1
  STATUS_CLOSED = 3
  TYPE_LADDER = 0
  TYPE_LEAGUE = 1
  TYPE_BRACKET = 2

  attr_protected :id, :updated_at, :created_at

  scope :active, :conditions => ["status != ?", STATUS_CLOSED]
  scope :inactive, :conditions => {:status => STATUS_CLOSED}
  scope :joinable, :conditions => {:status => STATUS_OPEN}
  scope :with_contesters, :include => :contesters
  scope :ordered, :order => "start DESC"
  scope :nsls1, :conditions => ["name LIKE ?", "NSL S1:%"]
  scope :nsls2, :conditions => ["name LIKE ?", "NSL S2:%"]
  scope :ns1seasons, :conditions => ["name LIKE ?", "S%:%"]

  has_many :matches, :dependent => :destroy
  has_many :weeks, :dependent => :destroy
  has_many :contesters, :dependent => :destroy, :include => :team
  has_many :predictions, :through => :matches
  has_many :brackets
  has_many :preds_with_score,
    :source => :predictions,
    :through => :matches,
    :select => "predictions.id, predictions.user_id,
    SUM(result) AS correct,
    SUM(result)/COUNT(*)*100 AS score,
    COUNT(*) AS total",
    :conditions => "result IS NOT NULL",
    :group => "predictions.user_id",
    :order => "correct DESC"
  has_and_belongs_to_many :maps
  belongs_to :demos, :class_name => "Directory"
  belongs_to :winner, :class_name => "Contester"
  belongs_to :rules, :class_name => "Article"

  validates_presence_of :name, :start, :end, :status, :default_time
  validates_length_of :name, :in => 1..50
  validates_length_of :short_name, :in => 1..8, :allow_nil => true
  validate :validate_status
  validate :validate_contest_type

  def to_s
    name
  end

  def status_s
    statuses[status]
  end

  def default_s
    "Sunday " + default_time.to_s
  end

  def statuses
    {STATUS_OPEN => "In Progress (signups open)", STATUS_PROGRESS => "In Progress (signups closed)", STATUS_CLOSED => "Closed"}
  end

  def types
    {TYPE_LADDER => "Ladder", TYPE_LEAGUE => "League", TYPE_BRACKET => "Bracket"}
  end

  def validate_status
    errors.add :status, I18n.t(:invalid_status) unless statuses.include? status
  end

  def validate_contest_type
    errors.add :contest_type, I18n.t(:contests_invalidtype) unless types.include? contest_type
  end

  def recalculate
    Match.update_all("diff = null, points1 = null, points2 = null", {:contest_id => self.id})
    Contester.update_all("score = 0, win = 0, loss = 0, draw = 0, extra = 0", {:contest_id => self.id})
    matches.finished.chrono.each do |match|
      match.recalculate
      match.save
    end
  end

  def elo_score score1, score2, diff, level = self.modulus_base, weight = self.weight, moduluses = [self.modulus_even, self.modulus_3to1, self.modulus_4to0]
    points = (score2-score1).abs
    modulus = moduluses[0].to_f if points <= 1
    modulus = moduluses[1].to_f if points == 2
    modulus = moduluses[2].to_f if points >= 3
    if score1 == score2
      result = 0.5
    elsif score1 > score2
      result = 1.0
    elsif score2 > score1
      result = 0.0
    end
    prob = 1.0/(10**(diff.to_f/weight.to_f)+1.0)
    total = (level.to_f*modulus*(result-prob)).round
    return total
  end

  def can_create? cuser
    cuser and cuser.admin?
  end

  def can_update? cuser
    cuser and cuser.admin?
  end

  def can_destroy? cuser
    cuser and cuser.admin?
  end
end