#
# Author:: Adam Jacob (<adam@chef.io>)
# Author:: Tyler Cloke (<tyler@chef.io>)
# Copyright:: Copyright 2008-2016, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require "chef/resource"
require "chef/provider/execute"

class Chef
  class Resource
    class Execute < Chef::Resource

      identity_attr :command

      # The ResourceGuardInterpreter wraps a resource's guards in another resource.  That inner resource
      # needs to behave differently during (for example) why_run mode, so we flag it here. For why_run mode
      # we still want to execute the guard resource even if we are not executing the wrapping resource.
      # Only execute resources (and subclasses) can be guard interpreters.
      attr_accessor :is_guard_interpreter

      default_action :run

      def initialize(name, run_context = nil)
        super
        @command = name
        @backup = 5
        @creates = nil
        @cwd = nil
        @environment = nil
        @group = nil
        @path = nil
        @returns = 0
        @timeout = nil
        @user = nil
        @umask = nil
        @default_guard_interpreter = :execute
        @is_guard_interpreter = false
        @live_stream = false
      end

      def umask(arg = nil)
        set_or_return(
          :umask,
          arg,
          :kind_of => [ String, Integer ]
        )
      end

      def command(arg = nil)
        set_or_return(
          :command,
          arg,
          :kind_of => [ String, Array ]
        )
      end

      def creates(arg = nil)
        set_or_return(
          :creates,
          arg,
          :kind_of => [ String ]
        )
      end

      def cwd(arg = nil)
        set_or_return(
          :cwd,
          arg,
          :kind_of => [ String ]
        )
      end

      def environment(arg = nil)
        set_or_return(
          :environment,
          arg,
          :kind_of => [ Hash ]
        )
      end

      alias :env :environment

      def group(arg = nil)
        set_or_return(
          :group,
          arg,
          :kind_of => [ String, Integer ]
        )
      end

      def live_stream(arg = nil)
        set_or_return(
          :live_stream,
          arg,
          :kind_of => [ TrueClass, FalseClass ])
      end

      def path(arg = nil)
        Chef::Log.warn "The 'path' attribute of 'execute' is not used by any provider in Chef 11 or Chef 12. Use 'environment' attribute to configure 'PATH'. This attribute will be removed in Chef 13."

        set_or_return(
          :path,
          arg,
          :kind_of => [ Array ]
        )
      end

      def returns(arg = nil)
        set_or_return(
          :returns,
          arg,
          :kind_of => [ Integer, Array ]
        )
      end

      def timeout(arg = nil)
        set_or_return(
          :timeout,
          arg,
          :kind_of => [ Integer, Float ]
        )
      end

      property :user, [ String, Integer ]

      property :domain, String

      property :password, String, sensitive: true

      def self.set_guard_inherited_attributes(*inherited_attributes)
        @class_inherited_attributes = inherited_attributes
      end

      def self.guard_inherited_attributes(*inherited_attributes)
        # Similar to patterns elsewhere, return attributes from this
        # class and superclasses as a form of inheritance
        ancestor_attributes = []

        if superclass.respond_to?(:guard_inherited_attributes)
          ancestor_attributes = superclass.guard_inherited_attributes
        end

        ancestor_attributes.concat(@class_inherited_attributes ? @class_inherited_attributes : []).uniq
      end

      def after_created
        validate_identity_platform(user, password, domain)
        identity = qualify_user(user, password, domain)
        domain(identity[:domain])
        user(identity[:user])
      end

      def validate_identity_platform(specified_user, password = nil, specified_domain = nil)
        if Chef::Platform.windows?
          if specified_user && password.nil?
            raise ArgumentError, "A value for `password` must be specified when a value for `user` is specified on the Windows platform"
          end
        else
          if password || specified_domain
            raise Exceptions::UnsupportedPlatform, "Values for `domain` and `password` are only supported on the Windows platform"
          end
        end
      end

      def qualify_user(specified_user, password = nil, specified_domain = nil)
        domain = specified_domain
        user = specified_user

        if specified_user.nil? && ! specified_domain.nil?
          raise ArgumentError, "The domain `#{specified_domain}` was specified, but no user name was given"
        end

        # if domain is provided in both username and domain
        if specified_user && ((specified_user.include? '\\') || (specified_user.include? "@")) && specified_domain
          raise ArgumentError, "The domain is provided twice. Username: `#{specified_user}`, Domain: `#{specified_domain}`. Please specify domain only once."
        end

        if ! specified_user.nil? && specified_domain.nil?
          # Splitting username of format: Domain\Username
          domain_and_user = user.split('\\')

          if domain_and_user.length == 2
            domain = domain_and_user[0]
            user = domain_and_user[1]
          elsif domain_and_user.length == 1
            # Splitting username of format: Username@Domain
            domain_and_user = user.split("@")
            if domain_and_user.length == 2
              domain = domain_and_user[1]
              user = domain_and_user[0]
            elsif domain_and_user.length != 1
              raise ArgumentError, "The specified user name `#{user}` is not a syntactically valid user name"
            end
          end
        end

        if ( password || domain ) && user.nil?
          raise ArgumentError, "A value for `password` or `domain` was specified without specification of a value for `user`"
        end

        { domain: domain, user: user }
      end

      set_guard_inherited_attributes(
        :cwd,
        :environment,
        :group,
        :user,
        :umask
      )

    end
  end
end