#
# Author:: Seth Chisamore <schisamo@chef.io>
# Cookbook Name:: chef_handler
# Provider:: default
#
# Copyright:: 2011-2016, Chef Software, Inc <legal@chef.io>
#
# 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.
#

include ::ChefHandler::Helpers

def whyrun_supported?
  true
end

# This action needs to find an rb file that presumably contains the indicated class in it and the
# load that file.  It then instantiates that class by name and registers it as a handler.
action :enable do
  class_name = new_resource.class_name
  new_resource.supports.each do |type, enable|
    next unless enable
    converge_by("disable #{class_name} as a #{type} handler") do
      unregister_handler(type, class_name)
    end
  end

  handler = nil
  converge_by("load #{class_name} from #{new_resource.source}") do
    require new_resource.source
    _, klass = get_class(class_name)
    handler = klass.send(:new, *collect_args(new_resource.arguments))
  end

  new_resource.supports.each do |type, enable|
    next unless enable
    converge_by("enable #{new_resource} as a #{type} handler") do
      register_handler(type, handler)
    end
  end
end

action :disable do
  new_resource.supports.each_key do |type|
    converge_by("disable #{new_resource} as a #{type} handler") do
      unregister_handler(type, new_resource.class_name)
    end
  end
end

def load_current_resource
  @current_resource = Chef::Resource::ChefHandler.new(new_resource.name)
  @current_resource.class_name(new_resource.class_name)
  @current_resource.source(new_resource.source)
  @current_resource
end

private

def collect_args(resource_args = [])
  if resource_args.is_a? Array
    resource_args
  else
    [resource_args]
  end
end