Assignment-6

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");
@@ -15,19 +15,27 @@ 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();
 
-        // NOTE
-        // - The data in products.csv is guaranteed to be valid.
+            if (line.isBlank()) {
+                continue;
+            }
+
+            String[] parts = line.split(",");
+
+            int productID = Integer.parseInt(parts[0].trim());
+            String name = parts[1].trim();
+            double price = Double.parseDouble(parts[2].trim());
+
+            Product product = new Product(productID, name, price);
+            productCatalog.add(product);
+        }
+
+        scanner.close();
     }
 
-    public static void main(String[] args)
-    {
+    public static void main(String[] args) {
         try {
             loadProducts();
         } catch (IOException e) {
@@ -43,4 +51,4 @@ public class Main {
         reportGenerator.saveReport();
         System.out.println("=== Report saved as report.txt");
     }
-}
+}

src/main/java/Product.java

@@ -20,4 +20,4 @@ public class Product {
     public double getPrice() {
         return price;
     }
-}
+}

src/main/java/ReportGenerator.java

@@ -1,4 +1,9 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileWriter;
+import java.io.IOException;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
@@ -15,69 +20,82 @@ 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() {
+        File file = new File(ordersFilePath);
+        if (!file.exists()) {
+            System.err.println("File not found: " + ordersFilePath);
+            return;
+        }
+
+        try (Scanner scanner = new Scanner(file)) {
+
+            while (scanner.hasNextLine()) {
+                String line = scanner.nextLine();
+
+                if (line.isBlank()) {
+                    continue;
+                }
+
+                try {
+                    String[] parts = line.split(",");
+
+                    if (parts.length != 3) {
+                        throw new Exception("Invalid line structure");
+                    }
+
+                    int productID = Integer.parseInt(parts[0].trim());
+                    int quantity = Integer.parseInt(parts[1].trim());
+                    int discountPercent = Integer.parseInt(parts[2].trim());
+
+                    if (productID <= 0 || quantity <= 0 || discountPercent < 0 || discountPercent > 99) {
+                        throw new Exception("Values out of logical bounds");
+                    }
+
+                    Product matchedProduct = null;
+                    for (Product p : productList) {
+                        if (p.getProductID() == productID) {
+                            matchedProduct = p;
+                            break;
+                        }
+                    }
+
+                    if (matchedProduct == null) {
+                        throw new Exception("Product ID does not exist");
+                    }
+
+                    double subTotal = quantity * matchedProduct.getPrice();
+                    double discountValue = subTotal * discountPercent / 100.0;
+                    double finalCost = subTotal - discountValue;
+
+                    totalQuantity += quantity;
+                    totalFinalCost += finalCost;
+                    totalDiscountValue += discountValue;
+
+                } catch (Exception e) {
+                    totalInvalidLines++;
+                }
+            }
+        } catch (FileNotFoundException e) {
+            System.err.println("Error opening 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() {
+        String report = "========= SALES REPORT =========\n" +
+                "Total Quantity Sold: " + totalQuantity + "\n" +
+                "Total Final Cost: $" + totalFinalCost + "\n" +
+                "Total Discount Value: $" + totalDiscountValue + "\n" +
+                "Invalid Rows: " + totalInvalidLines + "\n" +
+                "================================";
+
+        try {
+            FileWriter writer = new FileWriter("report.txt");
+            writer.write(report);
+            writer.close();
+        } catch (IOException e) {
+            System.err.println("Error writing the report file");
+        }
     }
 }