require 'fastercsv'


class Map < ActiveRecord::Base
  named_scope :lowest_scoring, :conditions => [
      %{`maps`.`points` = (
          SELECT `points` FROM `maps`
          ORDER BY `points` ASC
          LIMIT 1
      )}]

  def self.from_city_name(city_name)
    self.find_or_initialize_by_name(city_name).save!
  end

  def self.pair
    if Mash.count == 0
      self.all(:order => 'RANDOM()', :limit => 2)
    else
      self.lowest_scoring.all(:order => 'RANDOM()', :limit => 2)
    end
  end

  def self.import(csv_filename)
    FasterCSV.parse(open(csv_filename), :headers => true,
        :header_converters => [:downcase, :symbol]).each do |row|
      map = self.find_or_initialize_by_name(
        "#{row[:city]}, #{row[:region]}"
      )
      map.save
      if block_given?
        yield map
      end
    end
  end

  def rounds
    Mash.count(:conditions => ['map_a = :id OR map_b = :id', {:id => self.id}])
  end
end