metamaps--metamaps/app/controllers/topics_controller.rb

class TopicsController < ApplicationController
  include TopicsHelper

  before_filter :require_user, only: [:create, :update, :destroy]
    
  respond_to :html, :js, :json
    
  # GET /topics/autocomplete_topic
  def autocomplete_topic
    @current = current_user
    term = params[:term]
    if term && !term.empty?
    	# !connor term here needs to have .downcase
      @topics = Topic.where('LOWER("name") like ?', term.downcase + '%').order('"name"')
      
      #read this next line as 'delete a topic if its private and you're either 1. logged out or 2. logged in but not the topic creator
      @topics.delete_if {|t| t.permission == "private" && (!authenticated? || (authenticated? && @current.id != t.user_id)) }
    else
      @topics = []
    end
    render json: autocomplete_array_json(@topics)
  end
  
  # GET topics/:id
  def show
    @current = current_user
    @topic = Topic.find(params[:id]).authorize_to_show(@current)
	
    if @topic
	  @relatives = @topic.network_as_json(@current).html_safe
    else
	  redirect_to root_url and return
    end
	
    respond_to do |format|
      format.html { respond_with(@topic, @user) }
      #format.json { respond_with(@relatives) }
      format.json { render :json => @topic }
    end
  end

  # POST /topics
  # POST /topics.json
  def create
    @topic = Topic.new(params[:topic])

    respond_to do |format|
      if @topic.save
        format.json { render json: @topic, status: :created }
      else
        format.json { render json: @topic.errors, status: :unprocessable_entity }
      end
    end
  end
  
  # PUT /topics/1
  # PUT /topics/1.json
  def update
    @topic = Topic.find(params[:id])

    respond_to do |format|
      if @topic.update_attributes(params[:topic])
        format.json { head :no_content }
      else
        format.json { render json: @topic.errors, status: :unprocessable_entity }
      end
    end
  end
  
  # DELETE topics/:id
  def destroy
	  @current = current_user
	  @topic = Topic.find(params[:id]).authorize_to_edit(@current)
	  
    if @topic 
      @synapses = @topic.synapses
      @mappings = @topic.mappings
    
      @synapses.each do |synapse| 
        synapse.mappings.each do |m|
        
          @map = m.map
          @map.touch(:updated_at)
        
          #push notify to anyone viewing same map in realtime (see mapping.rb to understand the 'message' action)
          m.message 'destroy',@current.id
        
          m.delete
        end
        
        synapse.delete
      end
    
      @mappings.each do |mapping| 
      
        @map = mapping.map
        @map.touch(:updated_at)
        
        #push notify to anyone viewing a map with this topic in realtime (see mapping.rb to understand the 'message' action)
        mapping.message 'destroy',@current.id
      
        mapping.delete
      end
    
      @topic.delete
    end
      
    respond_to do |format|
      format.js { render :json => "success" }
    end
  end
end