module Alchemy
  module PgSearch

    # Provides full text search methods in your controller
    #
    module ControllerMethods

      # Adds a +before_action+ to your controller
      #
      def self.included(controller)
        controller.send(:before_action, :perform_search, only: :show)
        controller.send(:helper_method, :search_result_page)
        controller.send(:helper, Alchemy::PgSearch::SearchHelper)
      end

      private

      # Performs a full text search with +PgSearch+.
      #
      # Gets invoked everytime 'query' is given in params.
      #
      # This method only sets the +@search_results+ instance variable.
      #
      # You have to redirect to the search result page within a search form.
      #
      # === Alchemy provides a handy helper for rendering the search form:
      #
      #  render_search_form
      #
      # === Note
      #
      # If in preview mode a fake search value "lorem" will be set.
      #
      # @see Alchemy::PagesHelper#render_search_form
      #
      def perform_search
        if self.class == Alchemy::Admin::PagesController && params[:query].blank?
          params[:query] = 'lorem'
        end
        return if params[:query].blank?
        @search_results = search_results
        if paginate_per
          @search_results = @search_results.page(params[:page]).per(paginate_per)
        end
      end

      # Find Pages that have what is provided in "query" param with PgSearch
      #
      # @return [Array]
      #
      def search_results
        pages = Alchemy::PgSearch.config[:page_search_scope].pages
        # Since CanCan cannot (oh the irony) merge +accessible_by+ scope with pg_search scopes,
        # we need to fake a page object here
        if can? :show, Alchemy::Page.new(restricted: true, public_on: Date.current)
          pages.full_text_search(params[:query])
        else
          pages.not_restricted.full_text_search(params[:query])
        end
      end

      # A view helper that loads the search result page.
      #
      # @return [Alchemy::Page]
      #
      def search_result_page
        @search_result_page ||= begin
          page = Page.published.find_by(
            page_layout: search_result_page_layout['name'],
            language_id: Language.current.id
          )
          if page.nil?
            logger.warn "\n++++++\nNo published search result page found. Please create one or publish your search result page.\n++++++\n"
          end
          page
        end
      end

      def search_result_page_layout
        page_layout = PageLayout.get_all_by_attributes(searchresults: true).first
        if page_layout.nil?
          raise "No searchresults page layout found. Please add page layout with `searchresults: true` into your `page_layouts.yml` file."
        end
        page_layout
      end

      def paginate_per
        Alchemy::PgSearch.config[:paginate_per]
      end
    end
  end
end