src/main/java/Main.java

@@ -2,10 +2,14 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.InputMismatchException;
 import java.util.Scanner;
 
 public class Main {
+
     static ArrayList<Product> productCatalog = new ArrayList<>();
+
+
     public static void loadProducts() throws IOException{
         InputStream input = Main.class
                 .getClassLoader()
@@ -15,6 +19,20 @@ public class Main {
         }
         Scanner scanner = new Scanner(input);
 
+        while (scanner.hasNextLine()){
+            String line = scanner.nextLine();
+            String[] lines = line.split(",");
+
+            int id = Integer.parseInt(lines[0]);
+            String name = lines[1];
+            double price = Double.parseDouble(lines[2]);
+
+            Product product = new Product(id , name , price);
+            productCatalog.add(product);
+
+        }
+
+
         // TODO:
         // - Read each line from products.csv
         // - For each line, parse productId, name, and price

src/main/java/ReportGenerator.java

@@ -1,14 +1,18 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.PrintWriter;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
     private final String ordersFilePath;
     private final List<Product> productList;
 
-    private double totalFinalCost;
-    private int totalQuantity;
-    private double totalDiscountValue;
-    private int totalInvalidLines;
+    private double totalFinalCost =0;
+    private int totalQuantity=0;
+    private double totalDiscountValue=0;
+    private int totalInvalidLines=0;
 
     public ReportGenerator(String ordersFilePath, List<Product> productList) {
         this.ordersFilePath = ordersFilePath;
@@ -17,6 +21,64 @@ public class ReportGenerator {
 
     public void processFile()
     {
+        File inputfile = new File(ordersFilePath);
+        Scanner input = null;
+        try {
+            input = new Scanner(inputfile);
+        } catch (FileNotFoundException e) {
+            System.out.println("We cannot open csv file");;
+        }
+
+        while (input.hasNextLine()){
+            
+
+            
+            try{
+                String line = input.nextLine();
+                String[] data = line.split(",");
+                int id = Integer.parseInt(data[0]);
+                int quantity = Integer.parseInt(data[1]);
+                int discount = Integer.parseInt(data[2]);
+
+                if(quantity <= 0 || discount<0 || discount>= 100 || id <= 0 || id > 9){
+                    totalInvalidLines++;
+                    continue;
+                }
+
+                Product myProduct = null;
+                for (Product p : productList) {
+                    if (p.getProductID() == id) {
+                        myProduct = p;
+                        break;
+                    }
+                }
+
+                if (myProduct == null) {
+                    totalInvalidLines++;
+                    continue;
+                }
+
+
+                double subtotal = quantity * myProduct.getPrice();
+                double discountValue = subtotal * (discount / 100.0);
+                double finalCost = subtotal - discountValue;
+
+                totalQuantity += quantity;
+                totalFinalCost += finalCost;
+                totalDiscountValue += discountValue;
+
+
+
+            }catch (NumberFormatException e){
+                totalInvalidLines++;
+                continue;
+            }
+            
+
+
+        }
+
+        input.close();
         // TODO:
         // 1. Open the order details CSV file
         // 2. Read the file line by line
@@ -59,6 +121,21 @@ public class ReportGenerator {
 
     public void saveReport()
     {
+
+
+        try {
+            PrintWriter report = new PrintWriter("Report.txt");
+            report.println("=======REPORT========");
+            report.println("Totsl Quantity sold :" + totalQuantity);
+            report.println("Toal final cost: $" + totalFinalCost);
+            report.println("Total discount value : $" + totalDiscountValue);
+            report.println("Invalid rows: " + totalInvalidLines);
+            report.println("=====================");
+            report.close();
+
+        } catch (FileNotFoundException e) {
+            throw new RuntimeException(e);
+        }
         // TODO:
         // 1. Build a formatted report string
         // 2. Include: