module OpenConferenceWare
  class UserFavoritesController < ApplicationController
    # Don't assign @event for "modify" action, it doesn't need it and will be slowed by it.
    skip_before_filter :assign_events, only: :modify
    skip_before_filter :assign_current_event_without_redirecting, only: :modify

    before_filter :assert_user
    before_filter :authentication_required, only: :modify
    before_filter :assert_record_ownership, only: :modify

    # GET /favorites
    # GET /favorites.xml
    # GET /favorites.json
    def index
      @user_favorites = Defer {
        view_cache_key = "favorites,user_#{@user.id}.#{request.format},join_#{params[:join]}"
        Rails.cache.fetch(view_cache_key) {
          # The :join argument is sent by the AJAX UI to fetch a terse list of
          # proposal_ids so it can display stars next to favorited proposals.
          if params[:join] == "1"
            UserFavorite.proposal_ids_for(@user)
          else
            @user.favorites.populated
          end
        }
      }

      respond_to do |format|
        format.html # index.html.erb
        format.xml  { render xml: Undefer(@user_favorites) }
        format.json { render json: Undefer(@user_favorites) }
        format.ics {
          return redirect_to user_favorites_path(@user) unless schedule_visible?
          render text: Proposal.to_icalendar(
            @user_favorites.scheduled,
            title: "#{@user.label.possessiveize} favorites",
            url_helper: lambda {|item| session_url(item)})
        }
      end
    end

    # PUT /favorites/1.xml
    # PUT /favorites/1.json
    def modify
      unless params[:proposal_id].blank? || params[:mode].blank? || !['add','remove'].include?(params[:mode])
        @user_favorite = \
          case params[:mode]
          when 'add'
            UserFavorite.add(@user.id, params[:proposal_id])
          when 'remove'
            UserFavorite.remove(@user.id, params[:proposal_id])
          end

        respond_to do |format|
          format.xml  { head :ok }
          format.json { render json: @user_favorite }
        end
      else
        errors = {error: 'Malformed request.'}
        respond_to do |format|
          format.xml  { render xml: errors, status: :unprocessable_entity }
          format.json { render json: errors, status: :unprocessable_entity }
        end
      end
    end

  end
end