require 'fiona7/attribute_writers/attribute_writer'


module Fiona7
  module AttributeWriters
    class BinaryAsBinary < AttributeWriter
      def call(value, claimed_type=nil)
        if value.kind_of?(File)
          self.special_upload_handling(self.attr_name, value)
        elsif value.kind_of?(ActionDispatch::Http::UploadedFile)
          self.special_upload_uploaded_handling(self.attr_name, value)
        elsif value.nil?
          self.obj.set(self.attr_name, '')
        elsif value.kind_of?(Hash)
          source_blob_id = value["id"] || value["id_to_copy"]
          filename       = value["filename"]
          content_type   = value["content_type"]

          # There is a little bit of magic behind this.
          # This will pass some data directly to the crul_obj
          # bypassing self.obj.set(), but calling self.obj.save
          # afterwards still persists the data correctly
          #
          # This works the same way as Reactor::Tools::Uploader
          Fiona7::Builder::LazyBlobCopier.new({
            destination_obj:  self.obj,
            attr_name:        self.attr_name,
            source_blob_id:   source_blob_id,
            filename:         filename,
            content_type:     content_type
          }).call

          # NOTE: no self.obj.set() required here
        else
          raise Scrivito::ClientError.new("Invalid input for binary field", 422)
        end
      end

      protected

      def special_upload_handling(attribute_name, file)
        if !self.obj.binary?
          # standard handling!
          self.obj.set(attribute_name.to_s, self.upload_file(file))
        else
          ext  = ::File.extname(file.path).to_s[1..-1]
          self.obj.upload(file, ext)
        end
      end

      def special_upload_uploaded_handling(attribute_name, file)
        if !self.obj.binary?
          # standard handling!
          self.obj.set(attribute_name.to_s, self.upload_uploaded_file(file))
        else
          ext  = ::File.extname(file.original_filename).to_s[1..-1]
          self.obj.upload(file.open, ext)
        end
      end

      def upload_file(file)
        upload = Fiona7::Builder::IndirectBlobBuilder.new(self.obj, ::File.basename(file.path), file).call
        encoded_id = Fiona7::BlobIdGenerator.new(upload.id, upload.last_changed).call
        {title: encoded_id, destination_object: upload}
      end

      def upload_uploaded_file(file)
        upload = Fiona7::Builder::IndirectBlobBuilder.new(self.obj, file.original_filename, file.open).call
        encoded_id = Fiona7::BlobIdGenerator.new(upload.id, upload.last_changed).call
        {title: encoded_id, destination_object: upload}
      end
    end
  end
end