+ Implemented processFile and saveReport in ReportGenerator

+ Implemented loadProducts in main

src/main/java/Main.java

@@ -15,15 +15,20 @@ public class Main {
         }
         Scanner scanner = new Scanner(input);
 
-        // TODO:
+        while (scanner.hasNextLine()){
-        // - Read each line from products.csv
+            String line = scanner.nextLine();
-        // - For each line, parse productId, name, and price
+            String[] values = line.split(",");
-        // - The format of the file is like this:
-        //      [productId],[name],[price]
-        // - Store Product objects in the productCatalog ArrayList
 
-        // NOTE
+            int productId = Integer.parseInt(values[0]);
-        // - The data in products.csv is guaranteed to be valid.
+            String productName = values[1];
+            double productPrice = Double.parseDouble(values[2]);
+
+            Product product = new Product(productId,productName,productPrice);
+
+            productCatalog.add(product);
+        }
+
+        scanner.close();
     }
 
     public static void main(String[] args)
@@ -43,4 +48,4 @@ public class Main {
         reportGenerator.saveReport();
         System.out.println("=== Report saved as report.txt");
     }
-}
+}

src/main/java/ReportGenerator.java

@@ -1,4 +1,11 @@
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.text.ParseException;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
@@ -8,7 +15,7 @@ public class ReportGenerator {
     private double totalFinalCost;
     private int totalQuantity;
     private double totalDiscountValue;
-    private int totalInvalidLines;
+    private int totalInvalidLines = 0;
 
     public ReportGenerator(String ordersFilePath, List<Product> productList) {
         this.ordersFilePath = ordersFilePath;
@@ -17,67 +24,102 @@ public class ReportGenerator {
 
     public void processFile()
     {
-        // TODO:
+        Path path = Paths.get(ordersFilePath);
-        // 1. Open the order details CSV file
+        try {
-        // 2. Read the file line by line
+            Scanner scanner = new Scanner(path);
-        // 3. Split each line using comma delimiter
+            while(scanner.hasNextLine()){
-        //      (each line is guaranteed to contain exactly two commas)
+                String line = scanner.nextLine();
-        // 4. Each line contains exactly 3 values in the format:
+
-        //      [productId],[quantity],[discountPercent]
+                String[] values = line.split(",");
-        // 5. Attempt to convert values:
+                int productId;
-        //      - productId -> int
+                int quantity;
-        //      - quantity -> int
+                int discount;
-        //      - discountPercent -> int
+
-        //    NOTE:
+                // Product id
-        //      - quantity and discountPercent may contain invalid characters
+
-        //        (e.g., letters instead of numbers).
+                try{
-        //      - If parsing any value fails (NumberFormatException),
+                    productId = Integer.parseInt(values[0]);
-        //        the entire line must be considered invalid.
+                    if (productId <= 0 ){
-        //      - Use try-catch blocks and exception handling to safely
+                        System.err.println("Error, invalid product id : " + productId);
-        //        handle parsing and validation errors without stopping
+                        totalInvalidLines++;
-        //        the processing of the remaining lines.
+                        continue;
-        // 6. Validate parsed values:
+                    }
-        //      - productId must be greater than 0
+                }
-        //      - quantity must be greater than 0
+                catch (NumberFormatException e){
-        //      - discountPercent must be between 0 and 99 inclusive
+                    System.err.println("Error, invalid format for product id : " + values[0]);
-        // 7. Look for a Product in productList that matches productId
+                    totalInvalidLines++;
-        // 8. If no Product with that ID exists in the catalog,
+                    continue;
-        //      the entire line is considered invalid
+                }
-        // 9. If all values are valid and the product exists, calculate:
+
-        //      subtotal = quantity * product price
+                // Quantity
-        //      discountValue = subtotal * discountPercent / 100
+
-        //      finalCost = subtotal - discountValue
+                try{
-        // 10. Update report totals:
+                    quantity = Integer.parseInt(values[1]);
-        //      - totalQuantity += quantity
+                    if (quantity <= 0){
-        //      - totalFinalCost += finalCost
+                        System.err.println("Error, invalid quantity amount : " + quantity);
-        //      - totalDiscountValue += discountValue
+                        totalInvalidLines++;
-        // 11. If any parsing error, validation failure, or missing product occurs:
+                        continue;
-        //      - increment totalInvalidLines
+                    }
-        //      - skip the line and continue processing the next line
+                }
-        // 12. Close all file resources
+                catch (NumberFormatException e){
+                    System.err.println("Error, invalid format for quantity : " + values[1]);
+                    totalInvalidLines++;
+                    continue;
+                }
+
+                // Discount
+
+                try {
+                    discount = Integer.parseInt(values[2]);
+                    if (discount < 0 || discount > 99){
+                        System.err.println("Error, invalid discount amount : " + discount);
+                        totalInvalidLines++;
+                        continue;
+                    }
+                }
+                catch (NumberFormatException e){
+                    System.err.println("Error, invalid format for discount : " + values[2]);
+                    totalInvalidLines++;
+                    continue;
+                }
+
+                try {
+                    Product product = productList.get(productId - 1);
+
+                    double subTotal = quantity * product.getPrice();
+                    double discountValue = subTotal * discount / 100;
+                    double finalCost = subTotal - discountValue;
+
+                    totalQuantity += quantity;
+                    totalFinalCost += finalCost;
+                    totalDiscountValue += discountValue;
+                }
+                catch (IndexOutOfBoundsException e){
+                    System.err.println("Error, no such product exists with this id : " + productId);
+                    totalInvalidLines++;
+                    continue;
+                }
+            }
+            scanner.close();
+        } catch (IOException e) {
+            System.out.println("Unable to read order details.");
+        }
     }
 
     public void saveReport()
     {
-        // TODO:
+        try{
-        // 1. Build a formatted report string
+            FileWriter fileWriter = new FileWriter("report.txt");
-        // 2. Include:
+            fileWriter.write(" ========= SALES REPORT =========\n");
-        //      - total quantity
+            fileWriter.write("Total Quantity Sold:  " + totalQuantity + "\n");
-        //      - total final cost
+            fileWriter.write("Total Final Cost : $" + totalFinalCost + "\n");
-        //      - total discount value
+            fileWriter.write("Total Discount Value : $" + totalDiscountValue + "\n");
-        //      - total invalid lines
+            fileWriter.write("Invalid Rows : " + totalInvalidLines + "\n");
-        // 3. Create/open output report file (name it report.txt)
+            fileWriter.write("================================");
-        // 4. Write report string into file
+            fileWriter.close();
-        // 5. Handle file writing exceptions
+        }
-        // 6. Close writer resources
+        catch (IOException e) {
-
+            System.err.println(e.getMessage());
-        /* Example Structure
+        }
-        ========= SALES REPORT =========
-        Total Quantity Sold: 42
-        Total Final Cost: $1520.75
-        Total Discount Value: $230.50
-        Invalid Rows: 3
-        ================================
-        */
     }
 }