class RubyXL::ContentTypes

# File lib/rubyXL/objects/content_types.rb, line 30
def before_write_xml
  content_types_by_ext = {}

  # Collect all extensions and corresponding content types
  root.rels_hash.each_pair { |klass, objects|
    objects.each { |obj|
      next unless klass.const_defined?(:CONTENT_TYPE)
      ext = obj.xlsx_path.extname[1..-1]
      next if ext.nil?
      content_types_by_ext[ext] ||= []
      content_types_by_ext[ext] << klass::CONTENT_TYPE
    }
  }

  self.defaults = [ RubyXL::ContentTypeDefault.new(:extension => 'xml', :content_type => 'application/xml') ]

  # Determine which content types are used most often, and add them to the list of defaults
  content_types_by_ext.each_pair { |ext, content_types_arr|
    next if ext.nil? || defaults.any? { |d| d.extension == ext }
    most_frequent_ct = content_types_arr.group_by { |ct| ct }.values.max_by(&:size).first
    defaults << RubyXL::ContentTypeDefault.new(:extension => ext, :content_type => most_frequent_ct)
  }

  self.overrides = []

  # Add overrides for the files with known extensions but different content types.
  root.rels_hash.each_pair { |klass, objects|
    objects.each { |obj|
      obj_content_type = case
                         when obj.respond_to?(:content_type) then obj.content_type
                         when defined?(klass::CONTENT_TYPE)  then klass::CONTENT_TYPE
                         else next
                         end

      ext = obj.xlsx_path.extname[1..-1]
      next if defaults.any? { |d| (d.extension == ext) && (d.content_type == obj_content_type) }
      overrides << RubyXL::ContentTypeOverride.new(:part_name    => obj.xlsx_path,
                                                   :content_type => obj_content_type)
    }
  }

  true
end

# File lib/rubyXL/objects/content_types.rb, line 26
def xlsx_path
  XLSX_PATH
end