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

Reviewed-on: #1

100 / 100 * 0.7 delay

src/main/java/Main.java

@@ -6,7 +6,8 @@ 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");
@@ -15,23 +16,30 @@ public class Main {
         }
         Scanner scanner = new Scanner(input);
 
-        // TODO:
+        while (scanner.hasNextLine()) {
-        // - Read each line from products.csv
+            String line = scanner.nextLine().trim();
-        // - For each line, parse productId, name, and price
+            if (line.isEmpty()) {
-        // - The format of the file is like this:
+                continue;
-        //      [productId],[name],[price]
+            }
-        // - Store Product objects in the productCatalog ArrayList
 
-        // NOTE
+            String[] parts = line.split(",");
-        // - The data in products.csv is guaranteed to be valid.
+            if (parts.length == 3) {
+                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) {
-            System.err.println("Error reading products");
+            System.err.println("Error reading products: " + e.getMessage());
             System.out.println("Terminating the program...");
             return;
         }
@@ -43,4 +51,4 @@ public class Main {
         reportGenerator.saveReport();
         System.out.println("=== Report saved as report.txt");
     }
-}
+}

src/main/java/ReportGenerator.java

@@ -1,4 +1,9 @@
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
@@ -15,69 +20,87 @@ public class ReportGenerator {
         this.productList = productList;
     }
 
-    public void processFile()
+    public void processFile() {
-    {
+        Scanner scanner = null;
-        // TODO:
+        try {
-        // 1. Open the order details CSV file
+            File file = new File(ordersFilePath);
-        // 2. Read the file line by line
+            scanner = new Scanner(file);
-        // 3. Split each line using comma delimiter
+
-        //      (each line is guaranteed to contain exactly two commas)
+            while (scanner.hasNextLine()) {
-        // 4. Each line contains exactly 3 values in the format:
+                String line = scanner.nextLine().trim();
-        //      [productId],[quantity],[discountPercent]
+                if (line.isEmpty()) {
-        // 5. Attempt to convert values:
+                    continue;
-        //      - productId -> int
+                }
-        //      - quantity -> int
+
-        //      - discountPercent -> int
+                try {
-        //    NOTE:
+                    String[] parts = line.split(",");
-        //      - quantity and discountPercent may contain invalid characters
+                    if (parts.length != 3) {
-        //        (e.g., letters instead of numbers).
+                        totalInvalidLines++;
-        //      - If parsing any value fails (NumberFormatException),
+                        continue;
-        //        the entire line must be considered invalid.
+                    }
-        //      - Use try-catch blocks and exception handling to safely
+
-        //        handle parsing and validation errors without stopping
+                    int productId = Integer.parseInt(parts[0].trim());
-        //        the processing of the remaining lines.
+                    int quantity = Integer.parseInt(parts[1].trim());
-        // 6. Validate parsed values:
+                    int discountPercent = Integer.parseInt(parts[2].trim());
-        //      - productId must be greater than 0
+
-        //      - quantity must be greater than 0
+                    if (productId <= 0 || quantity <= 0 || discountPercent < 0 || discountPercent > 99) {
-        //      - discountPercent must be between 0 and 99 inclusive
+                        totalInvalidLines++;
-        // 7. Look for a Product in productList that matches productId
+                        continue;
-        // 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:
+                    Product matchedProduct = null;
-        //      subtotal = quantity * product price
+                    for (Product p : productList) {
-        //      discountValue = subtotal * discountPercent / 100
+                        if (p.getProductID() == productId) {
-        //      finalCost = subtotal - discountValue
+                            matchedProduct = p;
-        // 10. Update report totals:
+                            break;
-        //      - totalQuantity += quantity
+                        }
-        //      - totalFinalCost += finalCost
+                    }
-        //      - totalDiscountValue += discountValue
+
-        // 11. If any parsing error, validation failure, or missing product occurs:
+                    if (matchedProduct == null) {
-        //      - increment totalInvalidLines
+                        totalInvalidLines++;
-        //      - skip the line and continue processing the next line
+                        continue;
-        // 12. Close all file resources
+                    }
+
+                    double subtotal = quantity * matchedProduct.getPrice();
+                    double discountValue = (subtotal * discountPercent) / 100.0;
+                    double finalCost = subtotal - discountValue;
+
+                    totalQuantity += quantity;
+                    totalFinalCost += finalCost;
+                    totalDiscountValue += discountValue;
+
+                } catch (NumberFormatException e) {
+                    totalInvalidLines++;
+                }
+            }
+        } catch (IOException e) {
+            System.err.println("Error reading orders file: " + e.getMessage());
+        } finally {
+            if (scanner != null) {
+                scanner.close();
+            }
+        }
     }
 
-    public void saveReport()
+    public void saveReport() {
-    {
+        PrintWriter writer = null;
-        // TODO:
+        try {
-        // 1. Build a formatted report string
+            StringBuilder sb = new StringBuilder();
-        // 2. Include:
+            sb.append("===== SALES REPORT =====\n\n");
-        //      - total quantity
+            sb.append(String.format("Total Quantity: %d\n", totalQuantity));
-        //      - total final cost
+            sb.append(String.format("Total Final Cost: %.2f\n", totalFinalCost));
-        //      - total discount value
+            sb.append(String.format("Total Discount Value: %.2f\n", totalDiscountValue));
-        //      - total invalid lines
+            sb.append(String.format("Invalid Lines: %d\n", totalInvalidLines));
-        // 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 = new PrintWriter(new FileWriter("report.txt"));
-        ========= SALES REPORT =========
+            writer.print(sb.toString());
-        Total Quantity Sold: 42
+
-        Total Final Cost: $1520.75
+        } catch (IOException e) {
-        Total Discount Value: $230.50
+            System.err.println("Error writing report file: " + e.getMessage());
-        Invalid Rows: 3
+        } finally {
-        ================================
+            if (writer != null) {
-        */
+                writer.close();
+            }
+        }
     }
 }