module Eco
  module API
    class UseCases
      class OozeSamples
        module Helpers
          module OozeHandlers
            def merge_values(origin, append, klass: nil, delimiter: "\n")
              return origin if !append || append.to_s.strip.empty?
              return append if !origin || origin.to_s.strip.empty?
              case klass
              when Ecoportal::API::V2::Page::Component::RichTextField
                merge_values(origin, append, delimiter: "\n")
              when Ecoportal::API::V2::Page::Component::PlainTextField
                merge_values(origin, append, delimiter: "\n")
              when Ecoportal::API::V2::Page::Component::SelectionField
                merge_values(origin, append, delimiter: delimiter)
              when Ecoportal::API::V2::Page::Component::ReferenceField
                merge_values(origin, append, delimiter: delimiter)
              when Ecoportal::API::V2::Page::Component::PeopleField
                merge_values(origin, append, delimiter: delimiter)
              when Ecoportal::API::V2::Page::Component::DateField
                origin
              when Ecoportal::API::V2::Page::Component::NumberField
                origin
              when Ecoportal::API::V2::Page::Component::GaugeField
                origin
              when Ecoportal::API::V2::Page::Component::ChecklistField
                merge_values(origin, append, delimiter: delimiter)
              when Ecoportal::API::V2::Page::Component::ActionField
                merge_values(origin, append, delimiter: delimiter)
              when Ecoportal::API::V2::Page::Component::FilesField
                merge_values(origin, append, delimiter: delimiter)
              when Ecoportal::API::V2::Page::Component::ImagesField
                merge_values(origin, append, delimiter: delimiter)
              when Ecoportal::API::V2::Page::Component::GeoField
                merge_values(origin, append, delimiter: delimiter)
              when Ecoportal::API::V2::Page::Component::LawField
                merge_values(origin, append, delimiter: delimiter)
              else
                [origin, append].join(delimiter)
              end
            end

            def merge_arrays(ref, plus)
              return ref if ref == plus
              href_idx  = array_indexes(ref)
              hplus_idx = array_indexes(plus)

              shared = ref & plus
              hshared_ref_idx = href_idx.slice(*shared)

              # hidx_plus_shared = hplus_idx.slice(*shared).each_with_object({}) do |(e, idx), reversed|
              #   reversed[idx] = e
              # end
              # shared_plus_idxs = hidx_plus_shared.keys.reverse
              shared_plus_idxs = hplus_idx.values_at(*shared).sort.reverse

              only_plus = plus - ref
              honly_plus_idx = hplus_idx.slice(*only_plus)

              hplus_ref_idx = honly_plus_idx.each_with_object({}) do |(e, idx), hplus_ref_idx|
                ps_idx = shared_plus_idxs.bsearch {|i| idx >= i}
                rs_idx = ps_idx ? hshared_ref_idx[plus[ps_idx]] : -1
                hplus_ref_idx[e] = rs_idx
              end.group_by do |e, idx|
                idx
              end.to_a.sort_by do |(idx, pairs)|
                idx
              end.reverse.to_h.transform_values do |pairs|
                pairs.map(&:first)
              end
              hplus_ref_idx.each_with_object(ref.dup) do |(idx, elements), ref|
                ref.insert(idx+1, *elements)
              end
            end

            def array_indexes(ary)
              ary.each_with_index.to_h
            end
          end
        end
      end
    end
  end
end