require 'fiona7/name_and_parent_from_path'

module Fiona7
  module Builder
    # given a path it will ensure that all objects on this path exist
    # (or will be created if neccessary)
    class ContainerChainBuilder
      def initialize(path)
        @path = path
      end

      def call
        ensure_parent_exists(@path)
      end

      private

      include NameAndParentFromPath

      def ensure_parent_exists(path)
        # in most cases the parent is allready there and there is nothing
        # to do here at all.
        if obj = WriteObj.find_by_path(obj)
          return obj
        end

        remaining  = path.split("/")
        current    = []
        paths      = []
        original   = path

        while !remaining.empty?
          current.push(remaining.shift)

          path = current.join('/').presence || '/'
          paths.push(path)
        end

        paths.each do |path|
          if !WriteObj.exists?(path: path)
            name, parent_path = name_and_parent_path_from_path(path)
            WriteObj.create!(name: name, parent_obj_id: WriteObj.find_by_path(parent_path).id, obj_class: 'X_Container')
          end
        end

        WriteObj.find_by_path(original) || (raise "Tried to make sure that the parent under '#{original}' exist, but it does not :(")
      end
    end
  end
end