Merge pull request 'implement exercises. Add optional product catalog export' (#1) from develpe into main

Reviewed-on: f.mirabootalebi/HW-06-exceptions-and-file-handling#1

product_catalog.txt

@@ -0,0 +1,11 @@
+===== PRODUCT CATALOG =====
+1,Apple iPhone 16,999.99
+2,Samsung Galaxy S24,899.99
+3,Google Pixel 7,799.99
+4,OnePlus 11,699.99
+5,Sony WH-1000XM5 Headphones,349.99
+6,Apple MacBook Air,1199.99
+7,Dell XPS 13 Laptop,1099.99
+8,Amazon Echo Dot,49.99
+9,Fitbit Charge 5,129.99
+===========================

src/main/java/Main.java

@@ -24,6 +24,21 @@ public class Main {
 
         // NOTE
         // - The data in products.csv is guaranteed to be valid.
+        while (scanner.hasNextLine()) {
+            String line = scanner.nextLine();
+
+            String[] elements = line.split(",");
+
+            int productId = Integer.parseInt(elements[0]);
+            String name = elements[1];
+            double price = Double.parseDouble(elements[2]);
+
+            Product product = new Product(productId, name, price);
+            productCatalog.add(product);
+        }
+
+        scanner.close();
+
     }
 
     public static void main(String[] args)
@@ -42,5 +57,8 @@ public class Main {
         System.out.println("=== Order file processed");
         reportGenerator.saveReport();
         System.out.println("=== Report saved as report.txt");
+        //additional
+        reportGenerator.saveProductCatalog();
+        System.out.println("=== Product catalog saved");
     }
 }

src/main/java/ReportGenerator.java

@@ -55,6 +55,50 @@ public class ReportGenerator {
         //      - increment totalInvalidLines
         //      - skip the line and continue processing the next line
         // 12. Close all file resources
+
+        try(java.util.Scanner sc = new java.util.Scanner(new java.io.File(ordersFilePath))){
+            while(sc.hasNextLine()) {
+                String line = sc.nextLine();
+                String[] elements = line.split(",");
+
+                try {
+                    int productId = Integer.parseInt(elements[0]);
+                    int quantity = Integer.parseInt(elements[1]);
+                    int discountPercent = Integer.parseInt(elements[2]);
+
+                    if (productId <= 0 || quantity <= 0 || discountPercent < 0 || discountPercent > 99) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+
+                    Product foundProduct = null;
+
+                    for (Product pro : productList) {
+                        if (pro.getProductID() == productId) {
+                            foundProduct = pro;
+                            break;
+                        }
+                    }
+
+                    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++;
+                }
+            }
+        }
+        catch(java.io.IOException e) {
+            System.err.println("Error reading order file: " + ordersFilePath);
+        }
     }
 
     public void saveReport()
@@ -79,5 +123,36 @@ public class ReportGenerator {
         Invalid Rows: 3
         ================================
         */
+        String report = "========= SALES REPORT =========\n" + "Total Quantity Sold: " + totalQuantity + "\n" + "Total Final Cost: $" + String.format("%.2f", totalFinalCost) + "\n" + "Total Discount Value: $" + String.format("%.2f", totalDiscountValue) + "\n" + "Invalid Rows: " + totalInvalidLines + "\n" + "================================";
+
+        try(java.io.PrintWriter writer = new java.io.PrintWriter(new java.io.FileWriter("report.txt"))) {
+            writer.println(report);
         }
+        catch(java.io.IOException e) {
+            System.err.println("Error writing report file");
+        }
+
+    }
+    //additional
+    public void saveProductCatalog() {
+        try (java.io.PrintWriter writer =
+                     new java.io.PrintWriter(new java.io.FileWriter("product_catalog.txt"))) {
+
+            writer.println("===== PRODUCT CATALOG =====");
+
+            for (Product product : productList) {
+                writer.println(
+                        product.getProductID() + "," +
+                                product.getProductName() + "," +
+                                String.format("%.2f", product.getPrice())
+                );
+            }
+
+            writer.println("===========================");
+
+        } catch (java.io.IOException e) {
+            System.err.println("Error writing product catalog file");
+        }
+    }
+
 }