module Fiona7
  module Builder
    class IndirectBlobBuilder
      def initialize(obj, filename, file=nil)
        @obj = obj
        @filename = filename
        @file = file
      end

      def call
        # only publication type can contain children (code = "5")
        if @obj.obj_type_code != "5" || @obj.id == 2001
          parent_path = "/_uploads/#{@obj.id}"
        else
          parent_path = "#{@obj.path}/_uploads"
        end

        parent    = ensure_parent_exists(parent_path)
        ext       = ::File.extname(@filename).to_s[1..-1]
        name      = ::File.basename(@filename, '.' + ext.to_s)
        obj_class = if ['jpg', 'jpeg', 'gif', 'png', 'tif', 'tiff'].include?(ext)
                      'X_Image'
                    else
                      'X_Generic'
                    end

        if @file
          upload = WriteObj.upload(@file, ext, {name: name, parent: parent, obj_class: obj_class}).tap(&:release!)
        else
          upload = WriteObj.create({name: name, parent: parent, obj_class: obj_class}).tap(&:release!)
        end
      end

      protected
      # TODO: extract this code
      def ensure_parent_exists(path)
        remaining  = path.split("/")
        current    = []
        paths      = []
        original   = path

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

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

        # TODO: add an optimization for exiting parents

        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

      def name_and_parent_path_from_path(path)
        components = path.split('/')
        name       = components.pop.presence
        parent_path= components.join('/').presence || '/'

        return name, parent_path
      end
    end
  end
end