Feat : shipping fee difference

jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/business/domain/logistic/CostTrialCalculation.java

@@ -32,9 +32,19 @@ public class CostTrialCalculation {
 
     private final BigDecimal additionalCost;
 
+    private final BigDecimal previousUnitPrice;
 
-    private CostTrialCalculation(String countryCode, String logisticsChannelName, String logisticChannelCode, BigDecimal unitPrice, BigDecimal shippingCost,
-                                 BigDecimal registrationCost, BigDecimal additionalCost, Date effectiveDate) {
+    private final BigDecimal previousShippingCost;
+
+    private final BigDecimal previousRegistrationCost;
+
+    private final BigDecimal previousAdditionalCost;
+
+
+
+    private CostTrialCalculation(String countryCode, String logisticsChannelName, String logisticChannelCode,
+                                 BigDecimal unitPrice, BigDecimal shippingCost, BigDecimal registrationCost, BigDecimal additionalCost, Date effectiveDate,
+                                 BigDecimal previousUnitPrice,BigDecimal previousShippingCost, BigDecimal previousRegistrationCost, BigDecimal previousAdditionalCost) {
         this.countryCode = countryCode;
         this.logisticsChannelName = logisticsChannelName;
         this.logisticChannelCode = logisticChannelCode;
@@ -43,15 +53,28 @@ public class CostTrialCalculation {
         this.registrationCost = registrationCost;
         this.additionalCost = additionalCost;
         this.effectiveDate = effectiveDate;
+        this.previousUnitPrice = previousUnitPrice;
+        this.previousShippingCost = previousShippingCost;
+        this.previousRegistrationCost = previousRegistrationCost;
+        this.previousAdditionalCost = previousAdditionalCost;
     }
 
-    public CostTrialCalculation(LogisticChannelPrice price, int weight, String logisticsChannelName, String code) {
+    public CostTrialCalculation(LogisticChannelPrice price, LogisticChannelPrice previousPrice,int weight, String logisticsChannelName, String code) {
         this(price.getEffectiveCountry(), logisticsChannelName, code, price.getCalUnitPrice(), price.calculateShippingPrice(BigDecimal.valueOf(weight)),
-                price.getRegistrationFee(), price.getAdditionalCost(), price.getEffectiveDate());
+                price.getRegistrationFee(), price.getAdditionalCost(), price.getEffectiveDate(),
+                previousPrice.getCalUnitPrice(), previousPrice.calculateShippingPrice(BigDecimal.valueOf(weight)), previousPrice.getRegistrationFee(), previousPrice.getAdditionalCost()
+        );
     }
 
     @JsonProperty("TotalCost")
     public double getTotalCost() {
         return shippingCost.add(registrationCost).add(additionalCost).setScale(2, RoundingMode.CEILING).doubleValue();
     }
+
+    @JsonProperty("CostDifference")
+    public double getCostDifference() {
+        double previousCost = previousShippingCost.add(previousRegistrationCost).add(previousAdditionalCost).setScale(2, RoundingMode.CEILING).doubleValue();
+        BigDecimal diff = BigDecimal.valueOf((getTotalCost() - previousCost) / previousCost * 100);
+        return diff.setScale(2, RoundingMode.CEILING).doubleValue();
+    }
 }

jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/business/mapper/LogisticChannelPriceMapper.java

@@ -34,7 +34,7 @@ public interface LogisticChannelPriceMapper extends BaseMapper<LogisticChannelPr
      * @param countryList      the country, represented by 2 letters code
      * @return one propre price
      */
-    LogisticChannelPrice findBy(
+    List<LogisticChannelPrice> findBy(
             @Param("channelName") String channelName,
             @Param("date") Date shippingTime,
             @Param("trueWeight") BigDecimal weight,

jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/business/mapper/xml/LogisticChannelPriceMapper.xml

@@ -33,7 +33,7 @@
           AND effective_date <= #{date}
           AND active = 1
         ORDER BY effective_date DESC
-        LIMIT 1    </select>
+        LIMIT 2    </select>
 
     <select id="findPricesBy" resultType="org.jeecg.modules.business.entity.LogisticChannelPrice">
         SELECT lcp.id, lcp.create_by, lcp.create_time, lcp.update_by, lcp.update_time,

jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/business/service/ILogisticChannelService.java

@@ -47,7 +47,7 @@ public interface ILogisticChannelService extends IService<LogisticChannel> {
      * @param country     2 letters code of the destination country
      * @return one suitable logistic channel price
      */
-    LogisticChannelPrice findLogisticsChannelPrice(String channelName, Date date, int trueWeight, List<String> country);
+    List<LogisticChannelPrice> findLogisticsChannelPrice(String channelName, Date date, int trueWeight, List<String> country);
 
 
     List<CostTrialCalculation> logisticChannelTrial(int weight, int volume, List<String> countryList);

jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/business/service/impl/LogisticChannelPriceServiceImpl.java

@@ -90,13 +90,16 @@ public class LogisticChannelPriceServiceImpl extends ServiceImpl<LogisticChannel
 
         String countryCode = countryService.findByEnName(order.getCountry()).getCode();
 
-        LogisticChannelPrice price = logisticChannelPriceMapper.findBy(
+        List<LogisticChannelPrice> priceList = logisticChannelPriceMapper.findBy(
                 logisticChannelName,
                 order.getShippingTime(),
                 weight,
                 Collections.singletonList(countryCode)
         );
-
+        // find the one with latest effective date
+        LogisticChannelPrice price = priceList.stream()
+                .max(Comparator.comparing(LogisticChannelPrice::getEffectiveDate))
+                .orElse(null);
         if (price == null) {
             throw new UserException("Can't find price for channel {}, shipped at {}, weight {}, country {}",
                     logisticChannelName,

jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/business/service/impl/LogisticChannelServiceImpl.java

@@ -78,7 +78,7 @@ public class LogisticChannelServiceImpl extends ServiceImpl<LogisticChannelMappe
     }
 
     @Override
-    public LogisticChannelPrice findLogisticsChannelPrice(String channelName, Date date, int trueWeight, List<String> countryList) {
+    public List<LogisticChannelPrice> findLogisticsChannelPrice(String channelName, Date date, int trueWeight, List<String> countryList) {
         return logisticChannelPriceMapper.findBy(channelName, new java.util.Date(), BigDecimal.valueOf(trueWeight), countryList);
     }
 
@@ -98,9 +98,15 @@ public class LogisticChannelServiceImpl extends ServiceImpl<LogisticChannelMappe
                     } else {
                         trueWeight = weight;
                     }
-                    LogisticChannelPrice price = findLogisticsChannelPrice(channelName, new Date(), trueWeight, countryList);
+                    List<LogisticChannelPrice> priceList = findLogisticsChannelPrice(channelName, new Date(), trueWeight, countryList);
+                    LogisticChannelPrice price = priceList.stream()
+                            .max(Comparator.comparing(LogisticChannelPrice::getEffectiveDate))
+                            .orElse(null);
+                    LogisticChannelPrice previousPrice = priceList.stream()
+                            .min(Comparator.comparing(LogisticChannelPrice::getEffectiveDate))
+                            .orElse(null);
                     if (price != null) {
-                        return new CostTrialCalculation(price, trueWeight, internalName, code);
+                        return new CostTrialCalculation(price, previousPrice, trueWeight, internalName, code);
                     } else {
                         return null;
                     }