require "forwardable"

require "sequel"

require_relative "db"
require_relative "open_skill"

module RankKing
  class Pool < Sequel::Model
    one_to_many :items
    one_to_many :axes, class: "RankKing::Axis"
  end

  class Item < Sequel::Model
    many_to_one :pool
    one_to_many :ratings
  end

  class Axis < Sequel::Model(DB[:axes])
    many_to_one :pool
    one_to_many :ratings
  end

  class Rating < Sequel::Model
    many_to_one :item
    many_to_one :axis

    extend Forwardable
    def_delegators :openskill, :ordinal, :with

    def openskill
      OpenSkill::Rating.new(mu: self.mu, sigma: self.sigma)
    end
  end

  class Ranking < Sequel::Model
    many_to_one :axis
    many_to_one :winner, class: "RankKing::Item"
    many_to_one :loser, class: "RankKing::Item"
  end
end