module AdvertSelector
  module ApplicationHelper

    def advert_selector_initialize(available_placements = :all)
      Rails.logger.tagged('AdvertSelector') do

        Rails.logger.debug("AdvertSelection initialized")

        @advert_selector_banners_selected = []

        if params[:advert_selector_force]
          $advert_selector_banners_load_time = nil # reload everything
          if (banner = Banner.find_by_id(params[:advert_selector_force])) && banner.start_time.to_i.to_s == params[:advert_selector_force_stamp]
            advert_selector_banner_force(banner)
          end
        end

        advert_selector_banners.each do |banner|
          if available_placements == :all || available_placements.include?(banner.placement.name_sym)
            advert_selector_banner_try(banner)
          end
        end

        Rails.logger.debug("AdvertSelection finished")
      end
      ""
    end

    def advert_selector_force_test_infos
      if @advert_selector_force_banner_infos
        content_tag :div, :id => "advert_selector_info", :class => 'alert alert-info', :style => "position: fixed; bottom: 5px;" do
          content_tag(:strong) { "AdvertSelectorInfos for HelperItems:<br/>".html_safe } +
          content_tag(:ul) {
            @advert_selector_force_banner_infos.to_a.collect{|k, v| content_tag(:li){"#{k} : #{h(v)}".html_safe} }.join("\n").html_safe
          }
        end
      end

    end


    def advert_selector_banner_try(banner)

      if banner.show_now_basics? &&
          advert_selector_placement_free?(banner.placement) &&
          advert_selector_placement_once_per_session_ok?(banner.placement) &&
          advert_selector_banner_frequency_ok?(banner)

        banner.helper_items.each do |hi|
          if hi.content_for?
            content_for hi.name_sym, hi.content.html_safe
          else
            return unless send("advert_selector_#{hi.name}", hi)
          end
        end

        advert_selector_placement_once_per_session_shown(banner.placement)
        advert_selector_banner_frequency_shown(banner)

        banner.add_one_viewcount unless request.user_agent =~ /bot/i

        @advert_selector_banners_selected.push(banner)

        Rails.logger.info("Showing banner (#{banner.id}) #{banner.name} in placement #{banner.placement.name}")
      end

    rescue => e
      begin
        str = "Error with banner #{banner.name} in placement #{banner.placement.name}.\n#{Time.now.iso8601} - #{request.url} - #{params.inspect}\n#{e.inspect}\n\n#{e.backtrace.first(10).join("\n")}"

        AdvertSelector::ErrorsCache.add(str)
        Rails.logger.error(str)
      rescue => e
        Rails.logger.error("ERROR INSIDE ERROR with #{banner.name} in placement #{banner.placement.name} : #{e.inspect}")
      end
    end

    def advert_selector_banner_force(banner)
      @advert_selector_force_banner_infos  = []
      @advert_selector_force_banner_infos.push [:show_now_basics_times_not_used, banner.show_now_basics?(false)]
      @advert_selector_force_banner_infos.push [:show_now_basics_with_times, banner.show_now_basics?]
      @advert_selector_force_banner_infos.push [:placement_free, advert_selector_placement_free?(banner.placement)]
      @advert_selector_force_banner_infos.push [:placement_once_per_session, advert_selector_placement_once_per_session_ok?(banner.placement)]
      @advert_selector_force_banner_infos.push [:frequency, advert_selector_banner_frequency_ok?(banner)]
      banner.helper_items.each do |hi|
        @advert_selector_force_banner_infos.push [hi.name_sym,
                                                           if hi.content_for?
                                                             content_for hi.name_sym, hi.content.html_safe
                                                             content_for(hi.name_sym).first(20)
                                                           else
                                                             send("advert_selector_#{hi.name}", hi)
                                                           end]
      end

      @advert_selector_banners_selected.push(banner)
      Rails.logger.info("ForceShowing banner #{banner.name} in placement #{banner.placement.name}")

    end

    def advert_selector_placement_free?(placement)
      !placement.conflicting_with?(@advert_selector_banners_selected.collect{|b| b.placement.name_sym})
    end

    def advert_selector_placement_once_per_session_ok?(placement)
      !(  placement.only_once_per_session? && session[:advert_selector_session_shown] &&
          session[:advert_selector_session_shown].include?(placement.name) )
    end
    def advert_selector_placement_once_per_session_shown(placement)
      if placement.only_once_per_session?
        session[:advert_selector_session_shown] = [] if session[:advert_selector_session_shown].nil?
        session[:advert_selector_session_shown].push(placement.name)
      end
    end

    def advert_selector_banner_frequency_cookie(banner)
      val, time = cookies["ad_#{banner.id}"].to_s.split(",")
      [val.to_i, time]
    end
    def advert_selector_banner_frequency_ok?(banner)
      !banner.has_frequency? || advert_selector_banner_frequency_cookie(banner).first < banner.frequency
    end
    def advert_selector_banner_frequency_shown(banner)
      return true unless banner.has_frequency?

      val, time = advert_selector_banner_frequency_cookie(banner)
      time = time.blank? ? 1.week.from_now : Time.parse(time)
      val += 1
      cookies["ad_#{banner.id}"] = {:domain => :all, :expires => time, :value => [val, time.iso8601].join(",") }
    end

    ##########################################################

    def advert_selector_request_params_include?(placement)
      key, val = placement.content.to_s.split("=")
      return params[key] == val
    end


    ##########################################################

    $advert_selector_banners = []
    $advert_selector_banners_load_time = nil
    def advert_selector_banners
      if $advert_selector_banners_load_time.nil? || $advert_selector_banners_load_time < 10.minutes.ago || Rails.env.development?
        Rails.logger.info("AdvertSelection fetching banners and placements")
        $advert_selector_banners_load_time = Time.now

        $advert_selector_banners = Banner.find_current
      end

      $advert_selector_banners
    end

  end
end