class SimpleForm::Inputs::CollectionInput

def self.boolean_collection
  [ [I18n.t(:"simple_form.yes", default: 'Yes'), true],
    [I18n.t(:"simple_form.no", default: 'No'), false] ]
end

def collection
  @collection ||= begin
    collection = options.delete(:collection) || self.class.boolean_collection
    collection.respond_to?(:call) ? collection.call : collection.to_a
  end
end

def collection_includes_basic_objects?(collection_classes)
  (collection_classes & BASIC_OBJECT_CLASSES).any?
end

def detect_collection_classes(some_collection = collection)
  some_collection.map(&:class).uniq
end

def detect_collection_methods
  label, value = options.delete(:label_method), options.delete(:value_method)
  unless label && value
    common_method_for = detect_common_display_methods
    label ||= common_method_for[:label]
    value ||= common_method_for[:value]
  end
  [label, value]
end

def detect_common_display_methods(collection_classes = detect_collection_classes)
  collection_translated = translate_collection if collection_classes == [Symbol]
  if collection_translated || collection_classes.include?(Array)
    { label: :first, value: :second }
  elsif collection_includes_basic_objects?(collection_classes)
    { label: :to_s, value: :to_s }
  else
    detect_method_from_class(collection_classes)
  end
end

def detect_method_from_class(collection_classes)
  sample = collection.first || collection.last
  { label: SimpleForm.collection_label_methods.find { |m| sample.respond_to?(m) },
    value: SimpleForm.collection_value_methods.find { |m| sample.respond_to?(m) } }
end

def has_required?
  super && (input_options[:include_blank] || input_options[:prompt].present? || multiple?)
end

def input(wrapper_options = nil)
  raise NotImplementedError,
    "input should be implemented by classes inheriting from CollectionInput"
end

def input_options
  options = super
  options[:include_blank] = true unless skip_include_blank?
  translate_option options, :prompt
  translate_option options, :include_blank
  options
end

def multiple?
  !!options[:input_html].try(:[], :multiple)
end

def skip_include_blank?
  (options.keys & %i[prompt include_blank default selected]).any? || multiple?
end

def translate_collection
  if translated_collection = translate_from_namespace(:options)
    @collection = collection.map do |key|
      html_key = "#{key}_html".to_sym
      if translated_collection[html_key]
        [translated_collection[html_key].html_safe || key, key.to_s]
      else
        [translated_collection[key] || key, key.to_s]
      end
    end
    true
  end
end

def translate_option(options, key)
  if options[key] == :translate
    namespace = key.to_s.pluralize
    options[key] = translate_from_namespace(namespace, true)
  end
end