module Auth::Concerns::Shopping::CartControllerConcern

  extend ActiveSupport::Concern

  included do
    
  end

  ##if an id is provided in the permitted params then tries to find that in the database, and makes a new cart item out of it.
  #if no id is provided then creates a new cart_item from the permitted params, but excluding the id key.
  #if a collection i.e plural resources is present in the permitted_params and its also there in our auth resources, then create a resource class and resource symbol out of it and assign resource as in the comments.
  def initialize_vars
    
    instantiate_shopping_classes
   
    @auth_shopping_cart_params = permitted_params.fetch(:cart,{})
    
    @auth_shopping_cart = params[:id] ? @auth_shopping_cart_class.find_self(params[:id],current_signed_in_resource) : @auth_shopping_cart_class.new(@auth_shopping_cart_params)
        
  end

  ##override the as_json for cart_item, to show errors if there are any, otherwise just the id.
  def show
    
    not_found if @auth_shopping_cart.nil?
    @auth_shopping_cart.prepare_cart
    @auth_shopping_cart_items = @auth_shopping_cart.cart_items
    
    respond_with @auth_shopping_cart
  end

  ##responds with an array of the created cart items.
  ##resource id is set only during create, never during update.
  def create
    check_for_create(@auth_shopping_cart)
    @auth_shopping_cart = add_owner_and_signed_in_resource(@auth_shopping_cart)
    @auth_shopping_cart.save
    @auth_shopping_cart.process_items
    respond_with @auth_shopping_cart
  end

  ## always returns an empty array.
  def update
    puts "------ came to update cart -----------"
    check_for_update(@auth_shopping_cart)
    @auth_shopping_cart.assign_attributes(@auth_shopping_cart_params)
    @auth_shopping_cart = add_owner_and_signed_in_resource(@auth_shopping_cart)
    puts "Called save."
    @auth_shopping_cart.save
    puts "Came to process items."
    @auth_shopping_cart.process_items
    respond_with @auth_shopping_cart
  end

  ##will respond with nothing, or an array of cart_items that were removed, or whatever errors they have for not remvoing them.
  def destroy    
    check_for_destroy(@auth_shopping_cart)
    @auth_shopping_cart.prepare_cart
    @auth_shopping_cart.destroy
    respond_with @auth_shopping_cart
  end

  ## returns all the carts of the user.
  ## basically all his orders.
  def index
    query_clause = {:resource_id => lookup_resource.id.to_s}
    query_clause.merge({:personality_id => @auth_shopping_cart_params[:personality_id]}) if @auth_shopping_cart_params[:personality_id]
    @auth_shopping_carts = @auth_shopping_cart_class.where(query_clause)
    @auth_shopping_carts = @auth_shopping_carts.to_a
    @auth_shopping_carts.map{|c| c.prepare_cart}
    respond_with @auth_shopping_carts
  end

  def new

  end

  def edit

  end


  ############################################################
  ##
  ##
  ## GIVEN product ids, first create cart items, then  CREATE CART
  ##
  ## USED FROM THE DISCOUNT_OBJECT_SHOW PAGE
  ##
  ############################################################

  def bulk_create
    ## first create cart items.
    ## this will bypass the controller and create problems.
  end


  private

  ## and for add owner resource also , modify right now
  def permitted_params
    params.permit({cart: [:payment_stage, :resource_id,:personality_id, :place_id, :discount_id,:name, :notes, {:add_cart_item_ids => []},{:remove_cart_item_ids => []}]},:id)
  end

end