some

class SearchByDocType
  constructor: () ->
    doc_type_select_listener()

  doc_type_select_listener = () ->
    def = new SearchByDocType.Default
    first_type = new SearchByDocType.FirstType
    second_type = new SearchByDocType.SecondType

    if $('#document_type').length > 0
      $('#document_type').on 'change', () ->
        selected_val = $(this).val()
        selected = switch selected_val
          when 'default', ''
            def
          when 'first_type'
            first_type
          when 'second_type'
            second_type
          else
            alert 'Не настроены правила для данного типа документа!'
            def
        selected.set_up_new_fields()

      $('#document_type').trigger 'change'
    else
      def.set_up_new_fields()

class SearchByDocType.Base
  fieldsets: () ->
    {
      basics_fieldset: $('#basics_fieldset'),
      first_fieldset: $('#identity_cards_fieldset'),
      second_fieldset: $('#addresses_fieldset'),	
    }

  field_listener: () ->
      that = this
      @fieldset.on 'change', that.main_validate.bind(that)

  main_validate: () ->
    @fieldset.length > 1

  set_up_new_fields: () ->
    that = this
    @fieldset().each -> that.main_validate(this)

class SearchByDocType.Default extends SearchByDocType.Base
  constructor: () ->
    @fieldset = @fieldsets.first_fieldset
    field_listener()

  main_validate: (fieldset) ->
    console.log 'Default Main Validate' if fieldset.length > 3

class SearchByDocType.FirstType extends SearchByDocType.Base
  constructor: () ->
    @fieldset = @fieldsets.basics_fieldset
    field_listener()

  main_validate: () ->
    console.log 'FirstType Main Validate' if fieldset.length > 5

class SearchByDocType.SecondType extends SearchByDocType.Base
  constructor: () ->
    @fieldset = @fieldsets.second_fieldset
    field_listener()

  main_validate: (fieldset) ->
    console.log 'SecondType Main Validate' if fieldset.length > 7