src/main/java/Main.java

@@ -2,6 +2,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.List;
 import java.util.Scanner;
 
 public class Main {
@@ -15,19 +16,20 @@ 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[] columns = 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(columns[0]);
-        // - The data in products.csv is guaranteed to be valid.
+            String name = columns[1];
+            double price = Double.parseDouble(columns[2]);
+
+            productCatalog.add(new Product(productId, name, price));
+        }
     }
 
-    public static void main(String[] args)
+
-    {
+    public static void main(String[] args) throws IOException {
         try {
             loadProducts();
         } catch (IOException e) {

src/main/java/Product.java

@@ -9,6 +9,8 @@ public class Product {
         this.price = price;
     }
 
+
+
     public int getProductID() {
         return productID;
     }
@@ -20,4 +22,5 @@ public class Product {
     public double getPrice() {
         return price;
     }
+
 }

src/main/java/ReportGenerator.java

@@ -1,4 +1,9 @@
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.PrintWriter;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
@@ -13,71 +18,155 @@ public class ReportGenerator {
     public ReportGenerator(String ordersFilePath, List<Product> productList) {
         this.ordersFilePath = ordersFilePath;
         this.productList = productList;
+        this.totalFinalCost = 0.0;
+        this.totalQuantity = 0;
+        this.totalDiscountValue = 0.0;
+        this.totalInvalidLines = 0;
     }
 
-    public void processFile()
+    public void processFile() throws IOException {
-    {
+        Scanner scanner = null;
-        // TODO:
+        InputStream input = null;
-        // 1. Open the order details CSV file
+
-        // 2. Read the file line by line
+        try {
-        // 3. Split each line using comma delimiter
+            input = Main.class
-        //      (each line is guaranteed to contain exactly two commas)
+                    .getClassLoader()
-        // 4. Each line contains exactly 3 values in the format:
+                    .getResourceAsStream("2025_order_details.csv");
-        //      [productId],[quantity],[discountPercent]
+            if (input == null) {
-        // 5. Attempt to convert values:
+                throw new IOException("2025_order_details.csv not found");
-        //      - productId -> int
+            }
-        //      - quantity -> int
+            scanner = new Scanner(input);
-        //      - discountPercent -> int
+            int lineNumber = 0;
-        //    NOTE:
+
-        //      - quantity and discountPercent may contain invalid characters
+            while (scanner.hasNextLine()) {
-        //        (e.g., letters instead of numbers).
+                lineNumber++;
-        //      - If parsing any value fails (NumberFormatException),
+                String line = scanner.nextLine();
-        //        the entire line must be considered invalid.
+
-        //      - Use try-catch blocks and exception handling to safely
+                String[] columns = line.split(",");
-        //        handle parsing and validation errors without stopping
+
-        //        the processing of the remaining lines.
+                int productId = 0;
-        // 6. Validate parsed values:
+                int quantity = 0;
-        //      - productId must be greater than 0
+                int discountPercent = 0;
-        //      - quantity must be greater than 0
+                boolean isValid = true;
-        //      - discountPercent must be between 0 and 99 inclusive
+                String errorReason = "";
-        // 7. Look for a Product in productList that matches productId
+
-        // 8. If no Product with that ID exists in the catalog,
+                //Validation and parsing productId
-        //      the entire line is considered invalid
+                try {
-        // 9. If all values are valid and the product exists, calculate:
+                    productId = Integer.parseInt(columns[0]);
-        //      subtotal = quantity * product price
+                    if (productId <= 0) {
-        //      discountValue = subtotal * discountPercent / 100
+                        isValid = false;
-        //      finalCost = subtotal - discountValue
+                        errorReason = "productId must be > 0 (got " + productId + ")";
-        // 10. Update report totals:
+                    }
-        //      - totalQuantity += quantity
+                } catch (NumberFormatException e) {
-        //      - totalFinalCost += finalCost
+                    isValid = false;
-        //      - totalDiscountValue += discountValue
+                    errorReason = "productId is not a valid integer ('" + columns[0] + "')";
-        // 11. If any parsing error, validation failure, or missing product occurs:
+                }
-        //      - increment totalInvalidLines
+
-        //      - skip the line and continue processing the next line
+                //Validation and parsing quantity (if productId was valid)
-        // 12. Close all file resources
+                if (isValid) {
+                    try {
+                        quantity = Integer.parseInt(columns[1]);
+                        if (quantity <= 0) {
+                            isValid = false;
+                            errorReason = "quantity must be > 0 (got " + quantity + ")";
+                        }
+                    } catch (NumberFormatException e) {
+                        isValid = false;
+                        errorReason = "quantity is not a valid integer ('" + columns[1] + "')";
+                    }
+                }
+
+                //Validation and parsing discountPercent (if productId and quantity were valid)
+                if (isValid) {
+                    try {
+                        discountPercent = Integer.parseInt(columns[2].trim());
+                        if (discountPercent < 0 || discountPercent > 99) {
+                            isValid = false;
+                            errorReason = "discountPercent must be between 0-99 (got " + discountPercent + ")";
+                        }
+                    } catch (NumberFormatException e) {
+                        isValid = false;
+                        errorReason = "discountPercent is not a valid integer ('" + columns[2] + "')";
+                    }
+                }
+
+                //Skipping the line if no Product with that ID exists in the catalog
+                Product product = null;
+                if (isValid) {
+                    product = findProductById(productId);
+                    if (product == null) {
+                        isValid = false;
+                        errorReason = "Product with ID " + productId + " not found in catalog";
+                    }
+                }
+                if (!isValid) {
+                    System.out.println("Line " + lineNumber + " SKIPPED: " + errorReason);
+                    totalInvalidLines++;
+                    continue;
+                }
+
+                double productPrice = product.getPrice();
+                double subtotal = quantity * productPrice;
+                double discountValue = subtotal * discountPercent / 100;
+                double finalCost = subtotal - discountValue;
+
+                totalQuantity += quantity;
+                totalDiscountValue += discountValue;
+                totalFinalCost += finalCost;
+            }
+        } catch (IOException e) {
+            System.err.println("Error reading file: " + e.getMessage());
+            throw e;
+        } finally {
+            if (scanner != null) {
+                scanner.close();
+            }
+            if (input != null) {
+                try {
+                    input.close();
+                } catch (IOException e) {
+                    System.err.println("Error closing input stream: " + e.getMessage());
+                }
+            }
+        }
+    }
+
+    private Product findProductById(int productId) {
+        for (Product product : productList) {
+            if (product.getProductID() == productId) {
+                return product;
+            }
+        }
+        return null;
     }
 
     public void saveReport()
     {
-        // TODO:
+        PrintWriter writer = null;
-        // 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
+        try {
-        ========= SALES REPORT =========
+            StringBuilder report = new StringBuilder();
-        Total Quantity Sold: 42
+            report.append("========= SALES REPORT =========\n");
-        Total Final Cost: $1520.75
+            report.append(String.format("Total Quantity Sold: %d\n", totalQuantity));
-        Total Discount Value: $230.50
+            report.append(String.format("Total Final Cost: $%.2f\n", totalFinalCost));
-        Invalid Rows: 3
+            report.append(String.format("Total Discount Value: $%.2f\n", totalDiscountValue));
-        ================================
+            report.append(String.format("Invalid Rows: %d\n", totalInvalidLines));
-        */
+            report.append("================================\n");
+
+            String outputFileName = "report.txt";
+            writer = new PrintWriter(new FileWriter(outputFileName));
+
+            writer.print(report.toString());
+
+            System.out.println("Report saved successfully to: " + outputFileName);
+            System.out.println("\n" + report.toString());
+        } catch (IOException e) {
+            System.err.println("Error writing report to file: " + e.getMessage());
+            e.printStackTrace();
+        } finally {
+            if (writer != null) {
+                writer.close();
+            }
+        }
     }
 }