class Chef
  module Mixin
    module PowershellOut
      include Chef::Mixin::ShellOut

      begin
        include Chef::Mixin::WindowsArchitectureHelper
      rescue
        # nothing to do, as the include will happen when windows_architecture_helper.rb
        # is loaded.  This is for ease of removal of that library when either
        # powershell_out is core chef or powershell cookbook depends upon version
        # of chef that has Chef::Mixin::WindowsArchitectureHelper in core chef
      end

      def powershell_out(*command_args)
        script = command_args.first
        options = command_args.last.is_a?(Hash) ? command_args.last : nil

        run_command(script, options)
      end

      def powershell_out!(*command_args)
        cmd = powershell_out(*command_args)
        cmd.error!
        cmd
      end

      private
      def run_command(script, options)
        if options && options[:architecture]
          architecture = options[:architecture]
          options.delete(:architecture)
        else
          architecture = node_windows_architecture(node)
        end

        disable_redirection = wow64_architecture_override_required?(node, architecture)

        if disable_redirection
          original_redirection_state = disable_wow64_file_redirection(node)
        end

        command = build_command(script)

        if options
          cmd = shell_out(command, options)
        else
          cmd = shell_out(command)
        end

        if disable_redirection
          restore_wow64_file_redirection(node, original_redirection_state)
        end

        cmd
      end

      def build_command(script)
        flags = [
          # Hides the copyright banner at startup.
          "-NoLogo",
          # Does not present an interactive prompt to the user.
          "-NonInteractive",
          # Does not load the Windows PowerShell profile.
          "-NoProfile",
          # always set the ExecutionPolicy flag
          # see http://technet.microsoft.com/en-us/library/ee176961.aspx
          "-ExecutionPolicy RemoteSigned",
          # Powershell will hang if STDIN is redirected
          # http://connect.microsoft.com/PowerShell/feedback/details/572313/powershell-exe-can-hang-if-stdin-is-redirected
          "-InputFormat None"
        ]

        command = "powershell.exe #{flags.join(' ')} -Command \"#{script}\""
        command
      end
    end
  end
end