# frozen_string_literal: true

require 'facter'

# Detects active ceph service instances via systemctl and exposes facts
# for use in ceph service management profiles.
# rubocop:disable Style/ClassAndModuleChildren
module Unkin
  module Ceph
    # Detects active ceph service instances via systemctl and exposes Facter facts.
    module Utils
      TYPES = %w[mon mgr mds osd].freeze

      def self.services
        output = Facter::Core::Execution.execute(
          'systemctl list-units "ceph*" --no-legend --plain --all 2>/dev/null',
          on_fail: ''
        )
        parse_units(output)
      end

      def self.parse_units(output)
        result = TYPES.each_with_object({}) { |type, hash| hash[type] = [] }
        output.each_line do |line|
          unit = line.split.first
          next unless unit

          match_unit(result, unit)
        end
        result
      end

      def self.match_unit(result, unit)
        TYPES.each do |type|
          match = unit.match(/\Aceph-#{type}@(.+)\.service\z/)
          result[type] << "ceph-#{type}@#{match[1]}" if match
        end
      end

      TYPES.each do |type|
        define_singleton_method(:"#{type}?") { !services[type].empty? }
      end
    end
  end
end
# rubocop:enable Style/ClassAndModuleChildren

Facter.add('ceph_services') do
  setcode { Unkin::Ceph::Utils.services }
end

Unkin::Ceph::Utils::TYPES.each do |type|
  Facter.add("is_ceph_#{type}") do
    setcode { Unkin::Ceph::Utils.public_send(:"#{type}?") }
  end
end