tyrbo/lolsummoners

class StatsUpdater
  def self.update_all
    total = REGIONS.keys.reduce(0) { |sum, x| sum += StatsUpdater.new(x).update }

    Redis.current.set("total_all", total)

    build_stats
  end

  def self.build_stats
    stats = Stats.where.not(region: "all").group_by(&:name)
    stats.keys.each do |stat|
      values = stats[stat].map { |x| JSON.parse(x.value) }
      hash = values.reduce { |m, x| m.merge(x) { |_, o, n| o + n } }
      
      stat = Stats.find_or_initialize_by(region: "all", name: stat)
      stat.value = hash.to_json
      stat.save
    end
  end

  attr_reader :region
  TIERS = ['BRONZE', 'SILVER', 'GOLD', 'PLATINUM', 'DIAMOND', 'MASTER', 'CHALLENGER']

  def initialize(region)
    @region = region
  end

  def update
    total = TIERS.reduce(0) { |sum, tier| sum += update_tier(tier) }
    Redis.current.set("total_#{region}", total)
    total
  end

  def update_tier(tier)
    counts = counts_for_tier(tier)
    counts["total"] = counts.values.reduce(0, :+)

    stats = Stats.find_or_initialize_by(region: region, name: tier.downcase)
    stats.value = counts.to_json
    stats.save

    counts["total"]
  end

  private

  def counts_for_tier(tier)
    PlayerLeague.joins(:league)
      .group(:division)
      .where(leagues: { tier: tier, region: region })
      .count(:division)
  end
end