# frozen_string_literal: true

require 'date'

module Facter
  module Resolvers
    module Windows
      class Uptime < BaseResolver
        @log = Facter::Log.new(self)
        @fact_list ||= {}

        class << self
          private

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

          def substract_system_uptime_from_ole
            win = Win32Ole.new
            opsystem = win.return_first('SELECT LocalDateTime,LastBootUpTime FROM Win32_OperatingSystem')
            unless opsystem
              @log.debug 'WMI query returned no results'\
          'for Win32_OperatingSystem with values LocalDateTime and LastBootUpTime.'
              return
            end

            local_time = opsystem.LocalDateTime
            last_bootup = opsystem.LastBootUpTime

            return DateTime.parse(local_time).to_time - DateTime.parse(last_bootup).to_time if local_time && last_bootup

            nil
          end

          def calculate_system_uptime(fact_name)
            seconds = substract_system_uptime_from_ole.to_i if substract_system_uptime_from_ole
            if !seconds || seconds.negative?
              @log.debug 'Unable to determine system uptime!'
              return
            end

            hours = seconds / 3600
            days = hours / 24

            result = { seconds: seconds, hours: hours, days: days }

            result[:uptime] = determine_uptime(result)
            build_fact_list(result)

            @fact_list[fact_name]
          end

          def determine_uptime(result_hash)
            minutes = (result_hash[:seconds] - result_hash[:hours] * 3600) / 60

            if result_hash[:days].zero?
              "#{result_hash[:hours]}:#{minutes} hours"
            elsif result_hash[:days] == 1
              "#{result_hash[:days]} day"
            else
              "#{result_hash[:days]} days"
            end
          end

          def build_fact_list(system_uptime)
            @fact_list[:days] = system_uptime[:days]
            @fact_list[:hours] = system_uptime[:hours]
            @fact_list[:seconds] = system_uptime[:seconds]
            @fact_list[:uptime] = system_uptime[:uptime]
          end
        end
      end
    end
  end
end