FEAT:fixing

src/main/java/com/pos/app/controller/AnalyticsController.java

@@ -3,6 +3,7 @@
 import com.pos.app.annotations.BaseController;
 import com.pos.app.model.response.BaseResponse;
 import org.springframework.data.domain.Pageable;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 
@@ -33,4 +34,7 @@ BaseResponse getReportSales(
             @RequestParam(value = "start-date", required = false) Date startDate,
             @RequestParam(value = "end-date", required = false) Date endDate
     );
+
+    @GetMapping("v1/download-report")
+    ResponseEntity<byte[]> downloadReport();
 }

src/main/java/com/pos/app/controller/impl/AnalyticsControllerImpl.java

@@ -7,6 +7,7 @@
 import com.pos.app.utils.ResponseHelper;
 import lombok.RequiredArgsConstructor;
 import org.springframework.data.domain.Pageable;
+import org.springframework.http.ResponseEntity;
 
 import java.util.Date;
 
@@ -36,4 +37,10 @@ public BaseResponse getAnalyticsChartRevenue(Date startDate, Date endDate) {
     public BaseResponse getReportSales(Pageable pageable, Date startDate, Date endDate) {
         return ResponseHelper.createBaseResponse(analyticsService.getReportSales(pageable, startDate, endDate));
     }
+
+    @Override
+    public ResponseEntity<byte[]> downloadReport() {
+
+        return analyticsService.downloadReport();
+    }
 }

src/main/java/com/pos/app/model/response/ResponseSalesReport.java

@@ -18,7 +18,6 @@
 @JsonSerialize
 @JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
 public class ResponseSalesReport {
-
     private String productName;
     private String productId;
     private String orderId;

src/main/java/com/pos/app/repositories/OrderProductRepository.java

@@ -28,4 +28,15 @@ public interface OrderProductRepository extends JpaRepository<OrderProduct, Stri
             "join Transaction  as t on t.order.id = o.id " +
             "order by op.createdDate desc ")
     Page<Object[]> getSalesReport(Pageable pageable);
+
+    @Query(value = "select p.id, p.name," +
+            " o.id, op.qty, op.pricePerQty," +
+            " op.totalPrice, t.totalTransaction, " +
+            "t.taxPercentage, op.createdDate" +
+            " from OrderProduct as op " +
+            "join Product  as p on op.product.id = p.id " +
+            "join Order as o on o.id = op.order.id " +
+            "join Transaction  as t on t.order.id = o.id " +
+            "order by op.createdDate desc ")
+    List<Object[]> getSalesReport();
 }

src/main/java/com/pos/app/service/AnalyticsService.java

@@ -5,6 +5,7 @@
 import com.pos.app.model.response.ResponseSalesReport;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
+import org.springframework.http.ResponseEntity;
 
 import java.util.Date;
 import java.util.List;
@@ -18,4 +19,7 @@ public interface AnalyticsService {
     List<ResponseChartOrder> getAnalyticsChartRevenue(Date startDate, Date endDate);
 
     Page getReportSales(Pageable pageable, Date startDate, Date endDate);
+
+    ResponseEntity<byte[]> downloadReport();
+
 }

src/main/java/com/pos/app/service/impl/AnalyticsServiceImpl.java

@@ -13,8 +13,14 @@
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageImpl;
 import org.springframework.data.domain.Pageable;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 
+import java.io.ByteArrayOutputStream;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
 import java.math.BigInteger;
 import java.util.ArrayList;
 import java.util.Date;
@@ -111,4 +117,41 @@ public Page getReportSales(Pageable pageable, Date startDate, Date endDate) {
             throw new SystemErrorException(e);
         }
     }
+
+    @Override
+    public ResponseEntity<byte[]> downloadReport() {
+        List<Object[]> orderProductPage = orderProductRepository.getSalesReport();
+        try {
+            String[] headers = {"Product Name", "Product ID", "order ID", "qty", "price per qty", "total price", "total transaction", "tax", "date"};
+            String[][] data = new String[orderProductPage.size()][headers.length];
+
+            int index = 0;
+            for (Object[] obj : orderProductPage) {
+                String[] objData = new String[obj.length];
+                for (int i = 0; i < obj.length; i++) {
+                    objData[i] = obj[i] != null ? obj[i].toString() : "";
+                }
+                data[index] = objData;
+                index++;
+            }
+            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+            PrintWriter writer = new PrintWriter(new OutputStreamWriter(byteArrayOutputStream));
+
+            writer.println(String.join(",", headers));
+
+            for (String[] row : data) {
+                writer.println(String.join(",", row));
+            }
+
+            writer.flush();
+            writer.close();
+
+            HttpHeaders httpHeaders = new HttpHeaders();
+            httpHeaders.add("Content-Disposition", "attachment; filename=data.csv");
+
+            return new ResponseEntity<>(byteArrayOutputStream.toByteArray(), httpHeaders, HttpStatus.OK);
+        } catch (Exception e) {
+            throw new SystemErrorException(e);
+        }
+    }
 }