# Copyright (c) 2022 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true

require 'contrast/components/scope'
require 'cs__os_information/cs__os_information'

module Contrast
  module Utils
    # Simple utility used to make OS calls and determine state. For that state
    # which will not change at runtime, such as the operating system, the
    # Utility memozies to avoid multiple lookups.
    module OS
      extend Contrast::Components::Scope::InstanceMethods

      class << self
        def running?
          result = false
          with_contrast_scope do
            process = `ps aux | grep contrast-servic[e]`
            processes = process.split("\n")
            result = !processes.empty? && processes.any? { |process_descriptor| !process_descriptor.include?('grep') }
          end
          result
        end

        # check if service was killed and is a zombie process
        # returns an array of zombie process PIDs as strings; empty array if there are none
        def zombie_pids
          with_contrast_scope do
            # retrieve pid of service processes
            zombie_pid_list = `ps aux | grep contrast-servic[e] | grep Z | awk '{print $2}'`
            zombie_pid_list.split("\n")
          end
        end

        # Check current OS type
        # returns true if check is correct or false if not
        def windows?
          return @_windows unless @_windows.nil?

          @_windows = !(/cygwin|mswin|mingw|bccwin|wince|emx/ =~ RUBY_PLATFORM).nil?
        end

        def mac?
          @_mac = RUBY_PLATFORM.include? 'darwin' if @_mac.nil?
          @_mac
        end

        def unix?
          !windows?
        end

        def linux?
          (unix? and !mac?)
        end

        def jruby?
          @_jruby = RUBY_ENGINE == 'jruby' if @_jruby.nil?
          @_jruby
        end
      end
    end
  end
end