#
# Author:: AJ Christensen (<aj@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/provider/group/groupadd"
require "etc"

class Chef
  class Provider
    class Group
      class Suse < Chef::Provider::Group::Groupadd
        provides :group, platform: "opensuse", platform_version: "< 12.3"
        provides :group, platform: "suse", platform_version: "< 12.0"

        def load_current_resource
          super
        end

        def define_resource_requirements
          super
          requirements.assert(:all_actions) do |a|
            a.assertion { ::File.exist?("/usr/sbin/groupmod") }
            a.failure_message Chef::Exceptions::Group, "Could not find binary /usr/sbin/groupmod for #{new_resource.name}"
            # No whyrun alternative: this component should be available in the base install of any given system that uses it
          end

          requirements.assert(:create, :manage, :modify) do |a|
            a.assertion do
              begin
                to_add(new_resource.members).all? { |member| Etc.getpwnam(member) }
              rescue
                false
              end
            end
            a.failure_message Chef::Exceptions::Group, "Could not add users #{to_add(new_resource.members).join(', ')} to #{new_resource.group_name}: one of these users does not exist"
            a.whyrun "Could not find one of these users: #{to_add(new_resource.members).join(', ')}. Assuming it will be created by a prior step"
          end
        end

        def set_members(members)
          to_remove(members).each do |member|
            remove_member(member)
          end

          to_add(members).each do |member|
            add_member(member)
          end
        end

        def to_add(members)
          members - current_resource.members
        end

        def add_member(member)
          shell_out!("groupmod", "-A", member, new_resource.group_name)
        end

        def to_remove(members)
          current_resource.members - members
        end

        def remove_member(member)
          shell_out!("groupmod", "-R", member, new_resource.group_name)
        end

      end
    end
  end
end