.idea/.name

@@ -0,0 +1 @@
+Main.java

src/main/java/Main.java

@@ -3,6 +3,8 @@ import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Scanner;
+// @Author: Hesam Ghazi
+// Student Number: 403222015
 
 public class Main {
     static ArrayList<Product> productCatalog = new ArrayList<>();
@@ -13,17 +15,22 @@ public class Main {
         if (input == null) {
             throw new IOException("products.csv not found");
         }
-        Scanner scanner = new Scanner(input);
 
-        // TODO:
+try(Scanner scanner = new Scanner(input)) {
-        // - Read each line from products.csv
+    while (scanner.hasNextLine()) {
-        // - For each line, parse productId, name, and price
+        String line = scanner.nextLine().trim();
-        // - The format of the file is like this:
+        if (line.isEmpty()) continue;
-        //      [productId],[name],[price]
+        String[] parts = line.split(",");
-        // - Store Product objects in the productCatalog ArrayList
+        if (parts.length == 3) {
+            int productId = Integer.parseInt(parts[0].trim());
+            String name = parts[1].trim();
+            double price = Double.parseDouble(parts[2].trim());
 
-        // NOTE
+            productCatalog.add(new Product(productId, name, price));
-        // - The data in products.csv is guaranteed to be valid.
+        }
+
+    }
+}
     }
 
     public static void main(String[] args)

src/main/java/ReportGenerator.java

@@ -1,4 +1,9 @@
+import java.io.InputStream;
+import java.io.FileWriter;
+import java.io.PrintWriter;
+import java.io.IOException;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
@@ -15,69 +20,93 @@ public class ReportGenerator {
         this.productList = productList;
     }
 
-    public void processFile()
+    public void processFile() {
-    {
-        // TODO:
         // 1. Open the order details CSV file
-        // 2. Read the file line by line
+        InputStream input = Main.class.getClassLoader().getResourceAsStream(ordersFilePath);
-        // 3. Split each line using comma delimiter
+        if (input == null) {
-        //      (each line is guaranteed to contain exactly two commas)
+            System.err.println("Order details file not found: " + ordersFilePath);
-        // 4. Each line contains exactly 3 values in the format:
+            return;
-        //      [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 saveReport()
+        // 2. Read the file line by line using try-with-resources (Automatic closing)
-    {
+        try (Scanner scanner = new Scanner(input)) {
-        // TODO:
+            while (scanner.hasNextLine()) {
-        // 1. Build a formatted report string
+                String line = scanner.nextLine().trim();
-        // 2. Include:
+                if (line.isEmpty()) continue;
-        //      - 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
+                // Inner try-catch protects the outer loop from breaking if one row fails
-        ========= SALES REPORT =========
+                try {
-        Total Quantity Sold: 42
+                    // 3. & 4. Split each line using comma delimiter
-        Total Final Cost: $1520.75
+                    String[] parts = line.split(",");
-        Total Discount Value: $230.50
+                    if (parts.length != 3) {
-        Invalid Rows: 3
+                        throw new IllegalArgumentException("Line does not contain exactly 3 values");
-        ================================
+                    }
-        */
+
+                    // 5. Attempt to convert values
+                    // (Catching IllegalArgumentException below will naturally catch NumberFormatException here)
+                    int productId = Integer.parseInt(parts[0].trim());
+                    int quantity = Integer.parseInt(parts[1].trim());
+                    int discountPercent = Integer.parseInt(parts[2].trim());
+
+                    // 6. Validate parsed values
+                    if (productId <= 0) {
+                        throw new IllegalArgumentException("Product ID must be greater than 0");
+                    }
+                    if (quantity <= 0) {
+                        throw new IllegalArgumentException("Quantity must be greater than 0");
+                    }
+                    if (discountPercent < 0 || discountPercent > 99) {
+                        throw new IllegalArgumentException("Discount percent must be between 0 and 99 inclusive");
+                    }
+
+                    // 7. Look for a Product in productList that matches productId
+                    Product matchingProduct = null;
+                    for (Product p : productList) {
+                        if (p.getProductID() == productId) {
+                            matchingProduct = p;
+                            break;
+                        }
+                    }
+
+                    // 8. If no Product with that ID exists, consider it invalid
+                    if (matchingProduct == null) {
+                        throw new IllegalArgumentException("Product ID does not exist in catalog");
+                    }
+
+                    // 9. Calculations
+                    double subtotal = quantity * matchingProduct.getPrice();
+                    double discountValue = (subtotal * discountPercent) / 100.0;
+                    double finalCost = subtotal - discountValue;
+
+                    // 10. Update report totals
+                    this.totalQuantity += quantity;
+                    this.totalFinalCost += finalCost;
+                    this.totalDiscountValue += discountValue;
+
+                } catch (IllegalArgumentException e) {
+                    // 11. Handles both NumberFormatException and custom validation failures smoothly
+                    this.totalInvalidLines++;
+                    // Continues automatically to the next line in the while loop
+                }
+            }
+        } // 12. Scanner resource is safely closed here
+    }
+
+    public void saveReport() {
+        // 3. Create/open output report file (name it report.txt) using try-with-resources
+        try (PrintWriter writer = new PrintWriter(new FileWriter("report.txt"))) {
+
+            // 1. & 2. Build and write the formatted report string
+            writer.println("===== SALES REPORT =====");
+            writer.println();
+            writer.printf("Total Quantity: %d%n", totalQuantity);
+            writer.printf("Total Final Cost: %.2f%n", totalFinalCost);
+            writer.printf("Total Discount Value: %.2f%n", totalDiscountValue);
+            writer.printf("Invalid Lines: %d%n", totalInvalidLines);
+
+        } catch (IOException e) {
+            // 5. Handle file writing exceptions
+            System.err.println("Error generating report file: " + e.getMessage());
+        } // 6. PrintWriter resource safely closed here
     }
 }