# frozen_string_literal: true

module Facter
  class VirtualDetector
    def initialize
      @log = Facter::Log.new(self)
    end

    def platform # rubocop:disable Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
      fact_value = check_docker_lxc || check_dmi || check_gce || retrieve_from_virt_what || check_vmware
      fact_value ||= check_open_vz || check_vserver || check_xen || check_other_facts || check_lspci || 'physical'

      fact_value
    end

    def check_docker_lxc
      @log.debug('Checking Docker and LXC')
      Facter::Resolvers::Containers.resolve(:vm)
    end

    def check_dmi
      @log.debug('Checking DMI')
      vendor = Facter::Resolvers::DmiDecode.resolve(:vendor)
      @log.debug("dmi detected vendor: #{vendor}")
      return 'kvm' if vendor =~ /Amazon/

      'xen' if vendor =~ /Xen/
    end

    def check_gce
      @log.debug('Checking GCE')
      bios_vendor = Facter::Resolvers::Linux::DmiBios.resolve(:bios_vendor)
      'gce' if bios_vendor&.include?('Google')
    end

    def check_vmware
      @log.debug('Checking VMware')
      Facter::Resolvers::Vmware.resolve(:vm)
    end

    def retrieve_from_virt_what
      @log.debug('Checking virtual_what')
      Facter::Resolvers::VirtWhat.resolve(:vm)
    end

    def check_open_vz
      @log.debug('Checking OpenVZ')
      Facter::Resolvers::OpenVz.resolve(:vm)
    end

    def check_vserver
      @log.debug('Checking VServer')
      Facter::Resolvers::VirtWhat.resolve(:vserver)
    end

    def check_xen
      @log.debug('Checking XEN')
      Facter::Resolvers::Xen.resolve(:vm)
    end

    def check_other_facts
      @log.debug('Checking others')
      product_name = Facter::Resolvers::Linux::DmiBios.resolve(:product_name)
      bios_vendor =  Facter::Resolvers::Linux::DmiBios.resolve(:bios_vendor)
      return 'kvm' if bios_vendor&.include?('Amazon EC2')
      return unless product_name

      Facter::FactsUtils::HYPERVISORS_HASH.each { |key, value| return value if product_name.include?(key) }

      nil
    end

    def check_lspci
      @log.debug('Checking lspci')
      Facter::Resolvers::Lspci.resolve(:vm)
    end
  end
end