module SimpleActiveLinkTo
  ACTIVE_OPTIONS = %i[active class_active class_inactive active_disable].freeze

  # Wrapper around link_to. Accepts following params:
  #   :active         => Boolean | Symbol | Regex | Controller/Action Pair
  #   :class_active   => String
  #   :class_inactive => String
  #   :active_disable => Boolean
  # Example usage:
  #   simple_active_link_to('/users', class_active: 'enabled')
  def simple_active_link_to(*args, &block)
    name = block_given? ? capture(&block) : args.shift
    url = url_for(args.shift)
    link_options = args.shift&.dup || {}
    active_options = link_options.extract!(*ACTIVE_OPTIONS)

    css_class = "#{link_options[:class]} #{active_link_to_class(url, active_options)}"
    css_class.strip!
    link_options[:class] = css_class if css_class != ''

    is_active = is_active_link?(url, active_options[:active])
    link_options[:'aria-current'] = 'page' if is_active

    if active_options[:active_disable] == true && is_active
      content_tag(:span, name, link_options)
    else
      link_to(name, url, link_options)
    end
  end

  # Returns css class name. Takes the link's URL and its params
  # Example usage:
  #   active_link_to_class('/root', class_active: 'on', class_inactive: 'off')
  #
  def active_link_to_class(url, options = {})
    if is_active_link?(url, options[:active])
      options[:class_active] || 'active'
    else
      options[:class_inactive] || ''
    end
  end

  # Returns true or false based on the provided path and condition
  # Possible condition values are:
  #                  Boolean -> true | false
  #                   Symbol -> :exclusive | :inclusive
  #                    Regex -> /regex/
  #   Controller/Action Pair -> [[:controller], [:action_a, :action_b]]
  #
  # Example usage:
  #
  #   is_active_link?('/root', true)
  #   is_active_link?('/root', :exclusive)
  #   is_active_link?('/root', /^\/root/)
  #   is_active_link?('/root', ['users', ['show', 'edit']])
  #
  def is_active_link?(url, condition = nil)
    @is_active_link ||= {}
    @is_active_link[[url, condition]] ||= begin
      original_url = url
      url = Addressable::URI.parse(url).path
      path = request.original_fullpath
      case condition
      when :inclusive, nil
        path.match?(%r{^#{Regexp.escape(url).chomp('/')}(/.*|\?.*)?$})
      when :exclusive
        path.match?(%r{^#{Regexp.escape(url)}/?(\?.*)?$})
      when :exact
        path == original_url
      when Regexp
        path.match?(condition)
      when Array
        controllers = Array(condition[0])
        actions     = Array(condition[1])
        (controllers.blank? || controllers.member?(params[:controller])) &&
          (actions.blank? || actions.member?(params[:action])) ||
          controllers.any? do |controller, action|
            params[:controller] == controller.to_s && params[:action] == action.to_s
          end
      when TrueClass
        true
      when FalseClass
        false
      when Hash
        condition.all? do |key, value|
          params[key].to_s == value.to_s
        end
      end
    end
  end
end

ActiveSupport.on_load :action_view do
  include SimpleActiveLinkTo
end