Merge pull request 'HW6' (#1) from develop into main

Reviewed-on: Arefe00/HW-06-exceptions-and-file-handling#1

src/main/java/Main.java

@@ -16,14 +16,17 @@ 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
 
-        // NOTE
-        // - The data in products.csv is guaranteed to be valid.
+        while (scanner.hasNextLine()) {
+            String line = scanner.nextLine();
+            String[] parts = line.split(",");
+            int productId = Integer.parseInt(parts[0]);
+            String name = parts[1];
+            double price = Double.parseDouble(parts[2]);
+            Product product = new Product(productId, name, price);
+            productCatalog.add(product);
+
+        }
     }
 
     public static void main(String[] args)

src/main/java/ReportGenerator.java

@@ -1,5 +1,12 @@
 import java.util.List;
 
+import java.io.*;
+import java.util.Scanner;
+import java.io.IOException;
+import java.io.FileWriter;
+import java.io.InputStream;
+import java.util.List;
+
 public class ReportGenerator {
 
     private final String ordersFilePath;
@@ -15,69 +22,77 @@ 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
-        // 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
-    }
+        InputStream input = ReportGenerator.class
+                .getClassLoader()
+                .getResourceAsStream(ordersFilePath);
+        if (input == null) {
+            System.out.println("Order file not found");
+            return;
+        }
+        Scanner scanner = new Scanner(input);
+        while (scanner.hasNextLine()) {
+            String line = scanner.nextLine();
 
+            try {
+                String[] parts = line.split(",");
+                int productId = Integer.parseInt(parts[0]);
+                int quantity = Integer.parseInt(parts[1]);
+                int discountPercent = Integer.parseInt(parts[2]);
+                if (productId <= 0 ||
+                        quantity <= 0 ||
+                        discountPercent < 0 ||
+                        discountPercent > 99) {
+
+                    totalInvalidLines++;
+                    continue;
+                }
+                Product foundProduct = null;
+                int i = 0;
+                while (i < productList.size()) {
+                    Product product = productList.get(i);
+                    if (product.getProductID() == productId) {
+                        foundProduct = product;
+                        break;
+                    }
+                    i++;
+                }
+
+                if (foundProduct == null) {
+                    totalInvalidLines++;
+                    continue;
+                }
+                double subtotal = quantity * foundProduct.getPrice();
+                double discountValue = subtotal * discountPercent / 100.0;
+                double finalCost = subtotal - discountValue;
+                totalQuantity += quantity;
+                totalFinalCost += finalCost;
+                totalDiscountValue += discountValue;
+            } catch (NumberFormatException e) {
+                totalInvalidLines++;
+
+            }
+        }
+
+        scanner.close();
+    }
     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
-        ================================
-        */
+        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.out.println("Error writing report file");
+        }
     }
 }