module Fetching
  class ClubsFetcher < InfoFetcher
    URL = 'http://api.eliteprospects.com:80/beta/teams'.freeze
    LIMIT = 1000.freeze
    FIELDS = %w(name country.name locality.name latestTeamStats.league.name).freeze

    class << self

      def fetch
        raw_attrs = get_raw_clubs_attributes
        parse_clubs_attributes(raw_attrs)
      end

      private

      def get_raw_clubs_attributes(filter = {})
        attrs = []
        (0..total_count).step(LIMIT).each do |offset|
          attrs += get_attrs_part(offset, FIELDS, filter)
        end
        attrs
      end

      def parse_clubs_attributes(raw_clubs_attrs)
        clubs_attrs = []
        raw_clubs_attrs.each do |raw_attrs|
          address = [raw_attrs.fetch('country', nil)&.fetch('name', nil),
                     raw_attrs.fetch('locality', nil)&.fetch('name', nil)].join(' ')
          division = raw_attrs.fetch('latestTeamStats', nil)&.fetch('league')&.fetch('name')
          club_attrs = { name: raw_attrs['name'],
                          address: address,
                          division: division
                        }
          clubs_attrs << club_attrs
        end
        clubs_attrs
      end

      def total_count
        path = URL + '?limit=0'
        response = HTTParty.get(path)
        JSON.parse(response.body)['metadata']['totalCount']
      end

      def get_attrs_part(offset, fields, filter = {})
        _fields = fields.join(',')
        _filter = filter.map { |k, v| "#{k}=#{v}" }.join('&')
        path = URL + "?limit=#{LIMIT}&offset=#{offset}&filter=(#{_filter})&fields=#{_fields}"
        response = HTTParty.get(path)
        JSON.parse(response.body)['data']
      end
    end
  end
end