class Sprangular::CartsController < Sprangular::BaseController

  def show
    return not_found unless @order = current_order

    render json: @order,
           scope: current_spree_user,
           serializer: Sprangular::OrderSerializer,
           root: false
  end

  # Adds a new item to the order (creating a new order if none already exists)
  def add_variant
    order = current_order(create_order_if_necessary: true)
    variant  = Spree::Variant.find(params[:variant_id])
    quantity = params[:quantity].to_i

    if quantity.between?(1, 2_147_483_647)
      begin
        order.contents.add(variant, quantity)
        order.ensure_updated_shipments
        @order = order.reload
        render 'spree/api/orders/show'
      rescue ActiveRecord::RecordInvalid => e
        invalid_resource!(e.record)
      end
    else
      invalid_resource!(order)
    end
  end

  def update_variant
    variant_id = params[:variant_id].to_i

    @order = current_order(create_order_if_necessary: true)

    line_item = @order.line_items.detect { |li| li.variant_id == variant_id }
    data = {
      variant_id: variant_id,
      quantity: params[:quantity]
    }
    data.merge!(id: line_item.id) if line_item
    @order.contents.update_cart(line_items_attributes: { '0' => data })

    render 'spree/api/orders/show'
  end

  def change_variant
    old_variant_id = params[:old_variant_id].to_i
    new_variant_id = params[:new_variant_id].to_i

    @order = current_order(create_order_if_necessary: true)

    existing = @order.line_items.detect { |li| li.variant_id == new_variant_id }
    old = @order.line_items.detect { |li| li.variant_id == old_variant_id }

    if existing
      existing.update(variant_id: new_variant_id, quantity: existing.quantity + old.quantity)
      old.destroy
    else
      old.update(variant_id: new_variant_id)
    end

    @order.reload

    render 'spree/api/orders/show'
  end

  def remove_adjustment
    @order = current_order(create_order_if_necessary: true)
    adjustment = @order.adjustments.where(id: params[:adjustment_id]).first!
    promotion = @order.promotions.where('spree_promotions.id' => adjustment.source.promotion_id).first!
    @order.promotions.delete(promotion)
    adjustment.destroy

    @order.update_totals

    render 'spree/api/orders/show'
  end

  def destroy
    if @order = current_order
      @order.empty!
      @order.state ='cart'
      @order.save!
      render 'spree/api/orders/show'
    else
      not_found
    end
  end

  def guest_login
    order = current_order(create_order_if_necessary: true)
    if params[:order][:email] =~ Devise.email_regexp && order.update_attribute(:email, params[:order][:email])
      render json: { order: order, email: order.email }, status: 200
    else
      invalid_resource!(order)
    end
  end
end