module Vagrant
  module Plugin
    module V2
      # The base class for a guest. A guest represents an installed system
      # within a machine that Vagrant manages. There are some portions of
      # Vagrant which are OS-specific such as mountaing shared folders and
      # halting the machine, and this abstraction allows the implementation
      # for these to be seperate from the core of Vagrant.
      class Guest
        class BaseError < Errors::VagrantError
          error_namespace("vagrant.guest.base")
        end

        include Vagrant::Util

        # The VM which this system is tied to.
        attr_reader :vm

        # Initializes the system. Any subclasses MUST make sure this
        # method is called on the parent. Therefore, if a subclass overrides
        # `initialize`, then you must call `super`.
        def initialize(vm)
          @vm = vm
        end

        # This method is automatically called when the system is available (when
        # Vagrant can successfully SSH into the machine) to give the system a chance
        # to determine the distro and return a distro-specific system.
        #
        # If this method returns nil, then this instance is assumed to be
        # the most specific guest implementation.
        def distro_dispatch
        end

        # Halt the machine. This method should gracefully shut down the
        # operating system. This method will cause `vagrant halt` and associated
        # commands to _block_, meaning that if the machine doesn't halt
        # in a reasonable amount of time, this method should just return.
        #
        # If when this method returns, the machine's state isn't "powered_off,"
        # Vagrant will proceed to forcefully shut the machine down.
        def halt
          raise BaseError, :_key => :unsupported_halt
        end

        # Mounts a shared folder.
        #
        # This method should create, mount, and properly set permissions
        # on the shared folder. This method should also properly
        # adhere to any configuration values such as `shared_folder_uid`
        # on `config.vm`.
        #
        # @param [String] name The name of the shared folder.
        # @param [String] guestpath The path on the machine which the user
        #   wants the folder mounted.
        # @param [Hash] options Additional options for the shared folder
        #   which can be honored.
        def mount_shared_folder(name, guestpath, options)
          raise BaseError, :_key => :unsupported_shared_folder
        end

        # Mounts a shared folder via NFS. This assumes that the exports
        # via the host are already done.
        def mount_nfs(ip, folders)
          raise BaseError, :_key => :unsupported_nfs
        end

        # Configures the given list of networks on the virtual machine.
        #
        # The networks parameter will be an array of hashes where the hashes
        # represent the configuration of a network interface. The structure
        # of the hash will be roughly the following:
        #
        # {
        #   :type      => :static,
        #   :ip        => "192.168.33.10",
        #   :netmask   => "255.255.255.0",
        #   :interface => 1
        # }
        #
        def configure_networks(networks)
          raise BaseError, :_key => :unsupported_configure_networks
        end

        # Called to change the hostname of the virtual machine.
        def change_host_name(name)
          raise BaseError, :_key => :unsupported_host_name
        end
      end
    end
  end
end