Merge PR 'Complete Home Work 6 and file handling tasks' (#1) from develop into main

Full Mark

src/main/java/Main.java

@@ -15,15 +15,15 @@ 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[] parts = line.split(",");
-        // - The format of the file is like this:
+            int productId = Integer.parseInt(parts[0]);
-        //      [productId],[name],[price]
+            String name = parts[1];
-        // - Store Product objects in the productCatalog ArrayList
+            double price = Double.parseDouble(parts[2]);
-
+            productCatalog.add(new Product(productId, name, price));
-        // NOTE
+        }
-        // - The data in products.csv is guaranteed to be valid.
+        scanner.close();
     }
 
     public static void main(String[] args)

src/main/java/ReportGenerator.java

@@ -1,3 +1,8 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
 import java.util.List;
 
 public class ReportGenerator {
@@ -17,67 +22,69 @@ public class ReportGenerator {
 
     public void processFile()
     {
-        // TODO:
+        try {
-        // 1. Open the order details CSV file
+            BufferedReader reader = new BufferedReader(new FileReader(ordersFilePath));
-        // 2. Read the file line by line
+            String line;
-        // 3. Split each line using comma delimiter
+
-        //      (each line is guaranteed to contain exactly two commas)
+            while ((line = reader.readLine()) != null) {
-        // 4. Each line contains exactly 3 values in the format:
+                try {
-        //      [productId],[quantity],[discountPercent]
+                    String[] parts = line.split(",");
-        // 5. Attempt to convert values:
+                    int productId = Integer.parseInt(parts[0]);
-        //      - productId -> int
+                    int quantity = Integer.parseInt(parts[1]);
-        //      - quantity -> int
+                    int discountPercent = Integer.parseInt(parts[2]);
-        //      - discountPercent -> int
+
-        //    NOTE:
+                    if (quantity <= 0 || discountPercent < 0 || discountPercent > 99) {
-        //      - quantity and discountPercent may contain invalid characters
+                        totalInvalidLines++;
-        //        (e.g., letters instead of numbers).
+                        continue;
-        //      - If parsing any value fails (NumberFormatException),
+                    }
-        //        the entire line must be considered invalid.
+
-        //      - Use try-catch blocks and exception handling to safely
+                    Product foundProduct = null;
-        //        handle parsing and validation errors without stopping
+                    for (Product p : productList) {
-        //        the processing of the remaining lines.
+                        if (p.getProductID() == productId) {
-        // 6. Validate parsed values:
+                            foundProduct = p;
-        //      - productId must be greater than 0
+                            break;
-        //      - 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,
+                    if (foundProduct == null) {
-        //      the entire line is considered invalid
+                        totalInvalidLines++;
-        // 9. If all values are valid and the product exists, calculate:
+                        continue;
-        //      subtotal = quantity * product price
+                    }
-        //      discountValue = subtotal * discountPercent / 100
+
-        //      finalCost = subtotal - discountValue
+                    double subtotal = quantity * foundProduct.getPrice();
-        // 10. Update report totals:
+                    double discountValue = subtotal * discountPercent / 100.0;
-        //      - totalQuantity += quantity
+                    double finalCost = subtotal - discountValue;
-        //      - totalFinalCost += finalCost
+
-        //      - totalDiscountValue += discountValue
+                    totalQuantity += quantity;
-        // 11. If any parsing error, validation failure, or missing product occurs:
+                    totalFinalCost += finalCost;
-        //      - increment totalInvalidLines
+                    totalDiscountValue += discountValue;
-        //      - skip the line and continue processing the next line
+
-        // 12. Close all file resources
+                } catch (NumberFormatException e) {
+                    totalInvalidLines++;
+                }
+            }
+
+            reader.close();
+        } catch (IOException e) {
+            System.err.println("Error reading order file: " + e.getMessage());
+        }
     }
 
     public void saveReport()
     {
-        // TODO:
+        try {
-        // 1. Build a formatted report string
+            PrintWriter writer = new PrintWriter(new FileWriter("report.txt"));
-        // 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
+            writer.println("========= SALES REPORT =========");
-        ========= SALES REPORT =========
+            writer.println("Total Quantity Sold: " + totalQuantity);
-        Total Quantity Sold: 42
+            writer.printf("Total Final Cost: $%.2f%n", totalFinalCost);
-        Total Final Cost: $1520.75
+            writer.printf("Total Discount Value: $%.2f%n", totalDiscountValue);
-        Total Discount Value: $230.50
+            writer.println("Invalid Rows: " + totalInvalidLines);
-        Invalid Rows: 3
+            writer.println("================================");
-        ================================
+
-        */
+            writer.close();
+        } catch (IOException e) {
+            System.err.println("Error writing report: " + e.getMessage());
+        }
     }
 }