# Manage regions, mostly get stats out of them
class RegionsController < InheritedResources::Base
  def stats
    @region_events = Event.joins(:related_region).group(:name)
      .order('count(name) desc').count :name

    @city_events = Event.group(:city).having('count(city) > 3')
      .order('count(city) desc').count :city

    @year_events = Event.group(year_grouping).count

    @month_events = Event.group(year_grouping, month_grouping).count
  end

  private

  def year_grouping
    if %w(Mysql2 MySQL PostgreSQL).include? Event.connection.adapter_name
      'extract(year from start_time)'
    elsif Event.connection.adapter_name == 'SQLite'
      'strftime("%Y", start_time)'
    end
  end

  def month_grouping
    if %w(Mysql2 MySQL PostgreSQL).include? Event.connection.adapter_name
      'extract(month from start_time)'
    elsif Event.connection.adapter_name == 'SQLite'
      'strftime("%m", start_time)'
    end
  end
end