# frozen_string_literal: true

module Facter
  module Resolvers
    module Aix
      class Networking < BaseResolver
        init_resolver

        class << self
          private

          def post_resolve(fact_name)
            @fact_list.fetch(fact_name) { read_netstat(fact_name) }
          end

          def read_netstat(fact_name)
            @fact_list[:interfaces] = {}
            output = Facter::Core::Execution.execute('netstat -rn', logger: log)
            output = output.each_line.select { |line| (line =~ /\s\s[0-9]+.[0-9]+.[0-9]+.[0-9]+|\s\s.*:[0-9a-f]+/) }
            extract_interfaces(output)

            populate_with_mtu_and_mac!(@fact_list[:interfaces])
            get_primary_interface_info(output)
            ::Resolvers::Utils::Networking.expand_main_bindings(@fact_list)
            @fact_list[fact_name]
          end

          def get_primary_interface_info(output)
            primary_interface_info = output.find { |line| line =~ /=>/ }&.split(' ')
            @fact_list[:primary_interface] = primary_interface_info[5] if primary_interface_info
          end

          def extract_interfaces(netstat_output)
            netstat_output.each do |line|
              next if line =~ /default/

              info = line.split("\s")
              mask_length = info[0].match(%r{/([0-9]+)|%([0-9]+)})
              next unless mask_length

              is_ipv4 = info[1] =~ /[0-9]+.[0-9]+.[0-9]+.[0-9]+/
              build_bindings(info[5], info[1], mask_length[1] || mask_length[2], is_ipv4)
            end
          end

          def build_bindings(name, ip, mask_length, is_ipv4)
            bind_to_add = is_ipv4 ? :bindings : :bindings6
            ip = ip.gsub(/%[0-9]$/, '') # remove mask information if it exists
            mask_length = mask_length.to_i - 1 unless is_ipv4
            @fact_list[:interfaces][name] ||= {}
            @fact_list[:interfaces][name][bind_to_add] ||= []
            @fact_list[:interfaces][name][bind_to_add] << ::Resolvers::Utils::Networking.build_binding(ip, mask_length)
          end

          def populate_with_mtu_and_mac!(interfaces)
            output = Facter::Core::Execution.execute('netstat -in', logger: log)
            output.each_line do |line|
              next if line =~ /Name\s/

              info = line.split("\s")
              interface_name = info[0]
              mac = info[3][/^([0-9a-f]{1,2}[\.:-]){5}([0-9a-f]{1,2})$/]
              interfaces[interface_name][:mtu] = info[1].to_i
              interfaces[interface_name][:mac] = format_mac_address(mac) if mac
            end
          end

          def format_mac_address(address)
            address.split('.').map { |e| format('%<mac_address>02s', mac_address: e) }.join(':').tr(' ', '0')
          end
        end
      end
    end
  end
end