require 'chef/chef_fs/file_system/base_fs_object'
require 'chef/chef_fs/file_system/nonexistent_fs_object'

class Chef
  module ChefFS
    module FileSystem
      class MultiplexedDir < BaseFSDir
        def initialize(*multiplexed_dirs)
          @multiplexed_dirs = multiplexed_dirs.flatten
          super(@multiplexed_dirs[0].name, @multiplexed_dirs[0].parent)
        end

        attr_reader :multiplexed_dirs

        def write_dir
          multiplexed_dirs[0]
        end

        def children
          begin
            result = []
            seen = {}
            # If multiple things have the same name, the first one wins.
            multiplexed_dirs.each do |dir|
              dir.children.each do |child|
                if seen[child.name]
                  Chef::Log.warn("Child with name '#{child.name}' found in multiple directories: #{seen[child.name].path_for_printing} and #{child.path_for_printing}")
                else
                  result << child
                  seen[child.name] = child
                end
              end
            end
            result
          end
        end

        def can_have_child?(name, is_dir)
          write_dir.can_have_child?(name, is_dir)
        end

        def create_child(name, file_contents = nil)
          @children = nil
          write_dir.create_child(name, file_contents)
        end
      end
    end
  end
end