# Copyright (c) 2020 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true

cs__scoped_require 'socket'

cs__scoped_require 'contrast/extensions/ruby_core/module'
cs__scoped_require 'contrast/components/interface'
cs__scoped_require 'contrast/utils/object_share'
cs__scoped_require 'contrast/utils/string_utils'

module Contrast
  module Utils
    # Gather information about the application and server environment
    # that the agent is running in.
    class EnvironmentUtil
      CS_VERSION = 'VERSION'

      # Possible names of constants that would hold version info
      # TODO - RUBY-770
      VERSION_CONSTANT_CANDIDATES = %w[
        VERSION
        ::VERSION
        Version::VERSION
        ::Version::VERSION
        ::Application::VERSION
      ].cs__freeze

      class << self
        ######### These are helpers ####################

        def present? str
          !str.nil? && !str.to_s.empty?
        end

        ######### Actually env/framework dependent ####################

        # See CONTRAST-16380 for more details
        # TODO RUBY-770
        def determine_application_version
          @_determine_application_version ||= begin
            candidates = VERSION_CONSTANT_CANDIDATES.map do |name|
              # If there's a constant named 'name' (VERSION, etc.), get its value.
              begin
                name.split('::').inject(Object) do |mod, class_name|
                  mod.cs__const_get(class_name)
                end
              rescue LoadError, StandardError
                nil
              end
            end
            candidates.compact!
            candidate = candidates.first || ENV[CS_VERSION]

            case candidate
            when Hash
              candidate.values.join(Contrast::Utils::ObjectShare::PERIOD)
            when Array
              candidate.join(Contrast::Utils::ObjectShare::PERIOD)
            when String
              candidate
            when NilClass
              return nil
            else
              candidate.inspect
            end
          end
        end

        # Read libraries from the gemfile and append to the given ApplicationUpdate message
        # or other class that has a libraries map association
        # TODO - RUBY-770
        def add_library_to_app_update app_update_pb, library_tags = ''
          libraries = Contrast::Utils::GemfileReader.instance.library_pb_list
          libraries.each do |n|
            n.tags = library_tags
            app_update_pb.libraries[n.hash_code] = n
          end
        end
      end
    end
  end
end