src/main/java/Main.java

@@ -6,7 +6,7 @@ import java.util.Scanner;
 
 public class Main {
     static ArrayList<Product> productCatalog = new ArrayList<>();
-    public static void loadProducts() throws IOException{
+    public static void loadProducts() throws IOException {
         InputStream input = Main.class
                 .getClassLoader()
                 .getResourceAsStream("products.csv");
@@ -15,15 +15,17 @@ public class Main {
         }
         Scanner scanner = new Scanner(input);
 
-        // TODO:
-        // - Read each line from products.csv
-        // - For each line, parse productId, name, and price
-        // - The format of the file is like this:
-        //      [productId],[name],[price]
-        // - Store Product objects in the productCatalog ArrayList
+        while (scanner.hasNextLine()) {
+            String line = scanner.nextLine();
+            String[] parts = line.split(",");
 
-        // NOTE
-        // - The data in products.csv is guaranteed to be valid.
+            int id = Integer.parseInt(parts[0]);
+            String name = parts[1];
+            double price = Double.parseDouble(parts[2]);
+
+            productCatalog.add(new Product(id, name, price));
+        }
+        scanner.close();
     }
 
     public static void main(String[] args)

src/main/java/ReportGenerator.java

@@ -1,4 +1,8 @@
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
@@ -15,69 +19,64 @@ public class ReportGenerator {
         this.productList = productList;
     }
 
-    public void processFile()
-    {
-        // TODO:
-        // 1. Open the order details CSV file
-        // 2. Read the file line by line
-        // 3. Split each line using comma delimiter
-        //      (each line is guaranteed to contain exactly two commas)
-        // 4. Each line contains exactly 3 values in the format:
-        //      [productId],[quantity],[discountPercent]
-        // 5. Attempt to convert values:
-        //      - productId -> int
-        //      - quantity -> int
-        //      - discountPercent -> int
-        //    NOTE:
-        //      - quantity and discountPercent may contain invalid characters
-        //        (e.g., letters instead of numbers).
-        //      - If parsing any value fails (NumberFormatException),
-        //        the entire line must be considered invalid.
-        //      - Use try-catch blocks and exception handling to safely
-        //        handle parsing and validation errors without stopping
-        //        the processing of the remaining lines.
-        // 6. Validate parsed values:
-        //      - productId must be greater than 0
-        //      - quantity must be greater than 0
-        //      - discountPercent must be between 0 and 99 inclusive
-        // 7. Look for a Product in productList that matches productId
-        // 8. If no Product with that ID exists in the catalog,
-        //      the entire line is considered invalid
-        // 9. If all values are valid and the product exists, calculate:
-        //      subtotal = quantity * product price
-        //      discountValue = subtotal * discountPercent / 100
-        //      finalCost = subtotal - discountValue
-        // 10. Update report totals:
-        //      - totalQuantity += quantity
-        //      - totalFinalCost += finalCost
-        //      - totalDiscountValue += discountValue
-        // 11. If any parsing error, validation failure, or missing product occurs:
-        //      - increment totalInvalidLines
-        //      - skip the line and continue processing the next line
-        // 12. Close all file resources
+    public void processFile() {
+        try {
+            Scanner scanner = new Scanner(new File(ordersFilePath));
+            while (scanner.hasNextLine()) {
+                String line = scanner.nextLine();
+                String[] parts = line.split(",");
+
+                try {
+                    int productId = Integer.parseInt(parts[0]);
+                    int quantity = Integer.parseInt(parts[1]);
+                    int discount = Integer.parseInt(parts[2]);
+
+                    if (productId <= 0 || quantity <= 0 || discount < 0 || discount > 99) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+                    Product found = null;
+                    for (Product p : productList) {
+                        if (p.getProductID() == productId) {
+                            found = p;
+                            break;
+                        }
+                    }
+                    if (found == null) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+
+                    double subtotal = quantity * found.getPrice();
+                    double discountValue = subtotal * discount / 100.0;
+                    double finalCost = subtotal - discountValue;
+
+                    totalQuantity += quantity;
+                    totalFinalCost += finalCost;
+                    totalDiscountValue += discountValue;
+
+                } catch (NumberFormatException e) {
+                    totalInvalidLines++;
+                }
+            }
+            scanner.close();
+        } catch (IOException e) {
+            System.out.println("Error reading order file: " + e.getMessage());
+        }
     }
 
-    public void saveReport()
-    {
-        // TODO:
-        // 1. Build a formatted report string
-        // 2. Include:
-        //      - total quantity
-        //      - total final cost
-        //      - total discount value
-        //      - total invalid lines
-        // 3. Create/open output report file (name it report.txt)
-        // 4. Write report string into file
-        // 5. Handle file writing exceptions
-        // 6. Close writer resources
-
-        /* Example Structure
-        ========= SALES REPORT =========
-        Total Quantity Sold: 42
-        Total Final Cost: $1520.75
-        Total Discount Value: $230.50
-        Invalid Rows: 3
-        ================================
-        */
+    public void saveReport() {
+        try {
+            FileWriter writer = new FileWriter("report.txt");
+            writer.write("========= SALES REPORT =========\n");
+            writer.write("Total Quantity Sold: " + totalQuantity + "\n");
+            writer.write(String.format("Total Final Cost: $%.2f%n", totalFinalCost));
+            writer.write(String.format("Total Discount Value: $%.2f%n", totalDiscountValue));
+            writer.write("Invalid Rows: " + totalInvalidLines + "\n");
+            writer.write("================================\n");
+            writer.close();
+        } catch (IOException e) {
+            System.out.println("Error writing report: " + e.getMessage());
+        }
     }
 }