require 'uri'

module ApplicationHelper

  INDEXED_PAGES = [

    %w[pages index],

    %w[pages help],

    %w[pages privacy],

    %w[local_petitions index],

     %w[local_petitions show],

    %w[petitions index],

    %w[petitions show],

    %w[petitions new],

    %w[archived/petitions index],

    %w[archived/petitions show]

  ]

  def increment(amount = 1)

    @counter ||= 0

    @counter += amount

  end

  def home_page?

    params.values_at(:controller, :action) == %w[pages index]

  end

  def create_petition_page?

    params[:controller] == 'petitions' && params[:action].in?(%w[check create new])

  end

  def petition_page?

    params.values_at(:controller, :action) == %w[petitions show]

  end

  def open_petition_page?

    petition_page? && @petition.open?

  end

  def archived_petition_page?

    params[:controller] == 'archived/petitions' && params[:action] == 'show'

  end

  def back_url

    referer_url || 'javascript:history.back()'

  end

  def noindex_page?

    !params.values_at(:controller, :action).in?(INDEXED_PAGES)

  end

  def original_url

    request.original_url.force_encoding('utf-8')

  end

  private

  def referer_url

    begin

      uri = URI.parse(request.referer)

      %i[scheme host port].all?{ |k| uri.send(k) == request.send(k) } ? request.referer : nil

    rescue URI::InvalidURIError => e

      nil

    end

  end

end