# frozen_string_literal: true

# Helpers
module ApplicationHelper
  BRACKETS = /[\[\]]/.freeze
  ALPHA_LARGE = [*'a'..'z', *'A'..'Z'].freeze

  # Devuelve un indentificador aleatorio que puede usarse como atributo
  # HTML. Reemplaza Nanoid. El primer caracter siempre es alfabético.
  #
  # @return [String]
  def random_id
    SecureRandom.urlsafe_base64.tap do |s|
      s[0] = ALPHA_LARGE.sample
    end
  end

  # Devuelve el atributo name de un campo anidado en el formato que
  # esperan los helpers *_field
  #
  # [ 'post', :image, :description ]
  # [ 'post[image]', :description ]
  # 'post[image][description]'
  def field_name_for(*names)
    name = names.pop
    root = names.shift

    names.each do |n|
      root += "[#{n}]"
    end

    [root, name]
  end

  # Obtiene un ID
  #
  # @param base [String]
  # @param attribute [String, Symbol]
  def id_for(base, attribute)
    "#{base.gsub(BRACKETS, '_')}_#{attribute}".squeeze('_')
  end

  def plain_field_name_for(*names)
    root, name = field_name_for(*names)

    "#{root}[#{name}]"
  end

  def distance_of_time_in_words_if_more_than_a_minute(seconds)
    if seconds > 60
      distance_of_time_in_words seconds
    else
      I18n.t('seconds', seconds: seconds)
    end
  end

  # Sanitizador que elimina todo
  #
  # @param html [String]
  # @return [String]
  def text_plain(html)
    sanitize(html, tags: [], attributes: [])
  end

  # Sanitizador con etiquetas y atributos por defecto
  #
  # @param html [String]
  # @param options [Hash]
  # @return [String]
  def sanitize(html, options = {})
    options[:tags] ||= Sutty::ALLOWED_TAGS
    options[:attributes] ||= Sutty::ALLOWED_ATTRIBUTES

    super(html, options)
  end

  # Genera HTML y limpia etiquetas innecesarias
  #
  # @param [String]
  # @param [Hash]
  # @return [String]
  def sanitize_markdown(text, options = {})
    options.merge!(attributes: %w[id href alt class])

    document = CommonMarker
               .render_doc(text,
                           %i[FOOTNOTES SMART],
                           %i[table strikethrough autolink])

    sanitize(document.to_html, options)
  end

  def invalid?(model, field)
    model.errors.messages[field].present?
  end

  def form_control(model, field)
    if invalid? model, field
      'form-control is-invalid'
    else
      'form-control'
    end
  end

  def form_class(model)
    model.errors.messages.empty? ? 'needs-validation' : 'was-validated'
  end

  # Opciones por defecto para el campo de un formulario
  def field_options(attribute, metadata, **extra)
    required = extra.key?(:required) ? extra[:required] : metadata.required

    {
      class: "form-control #{invalid(metadata.post, attribute)} #{extra[:class]}",
      required: required,
      disabled: metadata.disabled?,
      autofocus: (metadata.post.attributes.first == attribute),
      aria: {
        describedby: id_for_help(attribute),
        required: required
      }
    }
  end

  # Devuelve la clase is-invalid si el campo tiene un error
  def invalid(post, attribute)
    'is-invalid' if post.errors[attribute].present?
  end

  # Busca la traducción de una etiqueta en los metadatos de un post
  def post_label_t(*attribute, post:, **extra)
    required = extra.key?(:required) ? extra[:required] : post[attribute.first].required

    label = post_t(*attribute, post: post, type: :label)
    label += I18n.t('posts.attributes.required.label') if required

    label
  end

  def post_help_t(*attribute, post:)
    post_t(*attribute, post: post, type: :help)
  end

  def id_for_help(*attribute)
    "#{attribute.join('-')}-help"
  end

  def id_for_feedback(*attribute)
    "#{attribute.join('-')}-feedback"
  end

  def id_for_datalist(*attribute)
    "#{attribute.join('-')}-datalist"
  end

  private

  def post_t(*attribute, post:, type:)
    post.layout.metadata.dig(*attribute, type.to_s, I18n.locale.to_s) ||
      post.layout.metadata.dig(*attribute, type.to_s, I18n.default_locale.to_s) ||
      I18n.t("posts.attributes.#{attribute.join('.')}.#{type}")
  end
end