class Cart < ActiveRecord::Base
  has_many :item_in_carts, -> { order "created_at" }
  belongs_to :delivery_destination
 
  def self.get_current(anonymous_id, user_id)
      safe_user_id = (user_id > 0) ? user_id : nil

      if user_id > 0
          uCart = Cart.where(user_id: user_id).where(ordered: false).first

          uCart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
          return uCart
      else

          anonymousCart = Cart.where(anonymous_id_string: anonymous_id).where(ordered: false).first

          anonymousCart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
          return anonymousCart
      end
  end

  def self.find_or_create(anonymous_id, user_id)

      safe_user_id = (user_id > 0) ? user_id : nil

      if user_id > 0
          #we're logged in
          # users anonymous stuff
          anonymousCart = Cart.where(anonymous_id_string: anonymous_id).where(ordered: false).first

          # users stuff in the db, create if needed
          uCart = Cart.where(user_id: user_id).where(ordered: false).first
          uCart ||= Cart.create!(user_id: safe_user_id, ordered: false )

          # now we have two carts for this logged in user, since he is logged in,
          # we'll merge everything

          if anonymousCart 
            # the user has an anonymous cart we need to merge it into ucart and delete it afterwards
            anonymousCart.item_in_carts.each do |item|
                uCart.item_in_carts << item
            end

            uCart.save
            anonymousCart.delete
          end

          uCart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
          return uCart
      else

          # we're not logged in
          # get the anonymous cart, create if needed
          anonymousCart = Cart.where(anonymous_id_string: anonymous_id).where(ordered: false).first
          anonymousCart ||= Cart.create!(anonymous_id_string: anonymous_id, user_id: safe_user_id, ordered: false )

          anonymousCart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
          return anonymousCart
      end
  #  logger.debug "Cart.find_or_create"
  
    #cart = Cart.where(anonymous_id_string: anonymous_id).where(ordered: false).first
    #safe_user_id = (user_id > 0) ? user_id : nil

    #if cart != nil && user_id > 0
        ## we have anonymous cart but also a user id
        ## we need to merge carts

        #uCart = Cart.where(user_id: user_id).where(ordered: false).first
        #uCart ||= Cart.create!(user_id: safe_user_id, ordered: false )

        #uCart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
        #logger.debug "Cart also found with aid but now has valid user id"

        #cart.item_in_carts.each do |item|
            #ucart.item_in_carts << item
        #end
        ##cart.user_id = safe_user_id
        ##cart.anonymous_id_string = nil
        ##cart.save
        #uCart.save
        #cart.delete
        ##cart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
        #return uCart
    #end

    #if cart != nil
        #return cart
    #end

    #cart = Cart.where(user_id: user_id).where(ordered: false).first

    #if cart != nil
        #logger.debug "Cart found by user_id"
        #cart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
        #return cart
    #end

    #logger.debug "Cart with aid will be used!"
    #cart ||= Cart.create!(anonymous_id_string: anonymous_id, user_id: safe_user_id, ordered: false )

    #cart.delivery_destination ||= DeliveryDestination.find_or_create(anonymous_id, user_id);
    #return cart
  end
end