促销计算价格

整单优惠的价格按照比例均摊到每一订单行价格

	/**
	 * 按照百分比分摊 order级别的discount
	 * 当商品行价格<需要扣减的价格，取商品行价格作为抵扣
	 * 如果到最后个产品商品行依然<需要扣减的价格，抛出异常
	 * @param orderLines
	 * @param orderPayment
	 * @param wholePromotions
	 * @return
	 * @throws OrderValidateException 
	 */
	private BigDecimal divideWholeDiscount(List<OrderLineCommand> orderLines,BigDecimal orderPayment,BigDecimal origionOrderPayment ,List<OrderPromotionCommand> wholePromotions) throws OrderValidateException{
		/*if(orderPayment==null||orderPayment.compareTo(BigDecimal.ZERO)<1){
			throw new OrderValidateException("payment less than zero",ValidateException.ORDER_DISCOUNT_VALIDATE_EXCEPTION);
		}*/
		
		BigDecimal sumDiscount = BigDecimal.ZERO;
		if(wholePromotions!=null){
			BigDecimal wholeDiscount = BigDecimal.ZERO;
			for(OrderPromotionCommand wholePromotion : wholePromotions){
				wholeDiscount = wholeDiscount.add(wholePromotion.getDiscountAmount());
			}
			sumDiscount = sumDiscount.add(wholeDiscount);
			
			Collections.sort(orderLines,new Comparator<OrderLineCommand>() {
				public int compare(OrderLineCommand o1, OrderLineCommand o2) {
					if(Validator.isNullOrEmpty(o1)||Validator.isNullOrEmpty(o2))
						return 0;
					return o1.getSubTotal().compareTo(o2.getSubTotal());
				}
			});
			
			int index = 0;
			BigDecimal appliedDiscount = BigDecimal.ZERO;
			for(OrderLineCommand orderLine : orderLines){
				index++;
				BigDecimal disPriceSum = orderLine.getSubTotal();
				logger.debug("whole discount adjust ...:disPriceSum="+disPriceSum+",index="+index+",skuId="+orderLine.getSkuId()+",subtotal="+orderLine.getSubTotal());
				BigDecimal adjustment = BigDecimal.ZERO;
				if(index==orderLines.size()){
					//这里表示是最后一个商品了，剩余的discount全叠加在上面
					BigDecimal lastDiscount = wholeDiscount.subtract(appliedDiscount);
					if(disPriceSum.compareTo(lastDiscount)<0){
						throw new OrderValidateException("discount greater than order payment",ValidateException.ORDER_DISCOUNT_VALIDATE_EXCEPTION);
					}else{
						adjustment = adjustment.add(lastDiscount);
					}
				}else{
					BigDecimal percent = BigDecimal.ZERO;
					//获取当前商品行在整单里的一个百分比，取整
					if(orderPayment.compareTo(BigDecimal.ZERO) ==1){
						percent = disPriceSum.divide(orderPayment,BigDecimal.ROUND_HALF_UP,4);
					}
					else if(origionOrderPayment.compareTo(BigDecimal.ZERO) == 1){
						percent = disPriceSum.divide(origionOrderPayment,BigDecimal.ROUND_HALF_UP,4);
					}
					adjustment = wholeDiscount.multiply(percent);
					adjustment = adjustment.setScale(2, BigDecimal.ROUND_HALF_UP);
					if(disPriceSum.compareTo(adjustment)<1){
						adjustment = disPriceSum;
					}
				}
				appliedDiscount = appliedDiscount.add(adjustment);
				
				orderLine.setDiscount(orderLine.getDiscount().add(adjustment));
				orderLine.setDiscountPrice(getDiscountPrice(orderLine.getSalePrice(), orderLine.getQuantity(), orderLine.getDiscount()));
				orderLine.setSubTotal(orderLine.getSubTotal().subtract(adjustment));
				logger.debug("whole discount adjust ...:adjustment="+adjustment);
			}
		}
		return sumDiscount;
	}

	private BigDecimal getDiscountPrice(BigDecimal salesPrice,Integer qty,BigDecimal discountAmount){
		BigDecimal qty_b = BigDecimal.valueOf(qty);
		BigDecimal discountPrice 
			= salesPrice.multiply(qty_b).subtract(discountAmount).divide(qty_b,2,RoundingMode.HALF_UP);
		Money m_dp = new Money(discountPrice); 
		return m_dp.getAmount();
	}