ensl.org/app/models/contest.rb

# == Schema Information
#
# Table name: contests
#
#  id           :integer          not null, primary key
#  contest_type :integer          default(0), not null
#  default_time :time
#  end          :datetime
#  modulus_3to1 :float(24)
#  modulus_4to0 :float(24)
#  modulus_base :integer
#  modulus_even :float(24)
#  name         :string(255)
#  short_name   :string(255)
#  start        :datetime
#  status       :integer
#  weight       :integer
#  created_at   :datetime
#  updated_at   :datetime
#  demos_id     :integer
#  rules_id     :integer
#  winner_id    :integer
#
# Indexes
#
#  index_contests_on_demos_id   (demos_id)
#  index_contests_on_rules_id   (rules_id)
#  index_contests_on_status     (status)
#  index_contests_on_winner_id  (winner_id)
#

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

  scope :active, -> { where.not(status: STATUS_CLOSED) }
  scope :inactive, -> { where(status: STATUS_CLOSED) }
  scope :joinable, -> { where(table[:status].eq(STATUS_OPEN).and(table[:end].gt(Time.now.utc))) }
  scope :with_contesters, -> { includes(:contesters) }
  scope :ordered, -> { order("start DESC") }
  scope :nsls1, -> { where("name LIKE ?", "NSL S1:%") }
  scope :nsls2, -> { where("name LIKE ?", "NSL S2:%") }
  scope :ns1seasons, -> { where("name LIKE ?", "S%:%") }

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

  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.where(contest_id: self.id).update_all("diff = null, points1 = null, points2 = null")
    Contester.where(contest_id: self.id).update_all("score = 0, win = 0, loss = 0, draw = 0, extra = 0")
    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 update_ranks contester, old_rank, new_rank
    if old_rank < new_rank
      Contester.update_all(["score = score -1, trend = ?", Contester::TREND_UP],
                           ["contest_id = ? and score > ? and score <= ?",
                            self.id, old_rank, new_rank])
      contester.trend = Contester::TREND_DOWN
    elsif old_rank > new_rank
      Contester.update_all(["score = score + 1, trend = ?", Contester::TREND_DOWN],
                           ["contest_id = ? and score < ? and score >= ?",
                            self.id, old_rank, new_rank])
      contester.trend = Contester::TREND_UP
    end
    contester.score = new_rank
  end

  def ladder_ranks_unique?
    c = Contester.where({:contest_id => self.id})
    c.uniq.pluck(:score).count == c.count
  end

  def can_join?(cuser)
    cuser and !cuser&.banned?(Ban::TYPE_LEAGUE) and \
      (cuser&.lead_teams.not_in_contest(self).exists?) and \
      Contest.joinable.where(id: self).exists?
  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

  def self.params params, cuser
    params.require(:contest).permit(:name, :start, :end, :status, :default_time,
                                    :contest_type, :winner_id, :demos_id, :short_name,
                                    :weight, :modulus_base, :modulus_even,
                                    :modulus_3to1, :modulus_4to0, :rules_id)
  end
end