require 'mspire/mzml/file_content'
require 'mspire/mzml/source_file'
require 'mspire/mzml/contact'

module Mspire
  class Mzml
    class FileDescription
      # note: FileDescription is NOT paramable!

      # a summary of the different types of spectra, must be present
      attr_accessor :file_content

      # may or may not be present
      attr_accessor :source_files

      # zero to many (just listed in the singular, not enclosed in a list)
      #
      #     <contact>
      #     </contact>
      #     <contact>
      #     </contact>
      attr_accessor :contacts

      # hands the user the object if given a block
      def initialize(file_content=nil, source_files=[], contacts=[])
        @file_content, @source_files, @contacts = file_content, source_files, contacts
        yield(self) if block_given?
        #raise ArgumentError, "FileDescription must have file_content" unless @file_content
      end

      def self.from_xml(xml, link)
        ref_hash = link[:ref_hash]
        file_content_n = xml.child
        obj = self.new( Mspire::Mzml::FileContent.new.describe_self_from_xml!(file_content_n, ref_hash) )

        return obj unless next_n = file_content_n.next

        if next_n.name == 'sourceFileList'
          obj.source_files = next_n.children.map do |source_file_n|
            Mspire::Mzml::SourceFile.from_xml(source_file_n, ref_hash)
          end
          return obj unless next_n = next_n.next
        end

        loop do
          obj.contacts << Mspire::Mzml::Contact.from_xml(contact_n, ref_hash)
          break unless contact_n = contact_n.next
        end
        obj
      end

      def to_xml(builder)
        builder.fileDescription do |fd_n|
          @file_content.to_xml(fd_n)
          if source_files.size > 0
            fd_n.sourceFileList(count: source_files.size) do |sf_n|
              source_files.each do |sf|
                sf.to_xml(sf_n)
              end
            end
          end
          contacts.each do |contact|
            contact.to_xml(fd_n)
          end
        end
      end
    end
  end
end