Merge pull request 'develop' (#1) from develop into main { score : 500/500 }

Reviewed-on: #1

src/main/java/Main.java

@@ -1,3 +1,5 @@
+import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
@@ -14,7 +16,15 @@ public class Main {
             throw new IOException("products.csv not found");
         }
         Scanner scanner = new Scanner(input);
-
+        while (scanner.hasNextLine()) {
+            String line = scanner.nextLine();
+            String[] parts = line.split(",");
+            int productID = Integer.parseInt(parts[0].trim());
+            String productName = parts[1].trim();
+            double price = Double.parseDouble(parts[2].trim());
+            Product product = new Product(productID, productName, price);
+            productCatalog.add(product);
+        }
         // TODO:
         // - Read each line from products.csv
         // - For each line, parse productId, name, and price

src/main/java/ReportGenerator.java

@@ -1,4 +1,9 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.PrintWriter;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
@@ -17,6 +22,64 @@ public class ReportGenerator {
 
     public void processFile()
     {
+        //opening orders and doing the math
+        try {
+            File source = new File(ordersFilePath);
+            Scanner scanner = new Scanner(source);
+
+            //reading line by line
+            while (scanner.hasNextLine()) {
+                int productId;
+                int count;
+                int discountPercent;
+                String line = scanner.nextLine();
+                String[] parts  = line.split(",");
+                try {
+                    productId = Integer.parseInt(parts[0].trim());
+                    if (productId < 1 || productId > productList.size()) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+
+                } catch (NumberFormatException e) {
+                    totalInvalidLines++;
+                    continue;
+                }
+                try {
+                    count = Integer.parseInt(parts[1].trim());
+                    if(count < 1) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+                } catch (NumberFormatException e) {
+                    totalInvalidLines++;
+                    continue;
+                }
+                try {
+                    discountPercent = Integer.parseInt(parts[2].trim());
+                    if (discountPercent < 0 || discountPercent > 99) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+                } catch (NumberFormatException e) {
+                    totalInvalidLines++;
+                    continue;
+                }
+
+                //computing the results
+                double cost = count * productList.get(productId - 1).getPrice();
+                double discount = count * productList.get(productId - 1).getPrice() * discountPercent / 100;
+                totalFinalCost += cost - discount;
+                totalDiscountValue += discount;
+                totalQuantity += count;
+
+            }
+            scanner.close();
+        } catch (FileNotFoundException e) {
+        System.out.println("File not found.");
+        } catch (IOException e) {
+            System.out.println(e.getMessage());
+        }
         // TODO:
         // 1. Open the order details CSV file
         // 2. Read the file line by line
@@ -59,6 +122,22 @@ public class ReportGenerator {
 
     public void saveReport()
     {
+        try {
+            File file = new File("report.txt");
+            PrintWriter printWriter = new PrintWriter(file);
+            printWriter.println("========= SALES REPORT =========");
+            printWriter.println("Total Quantity Sold: " + totalQuantity);
+            printWriter.printf("Total Final Cost: %.2f\n", totalFinalCost);
+            printWriter.printf("Total Discount Value: %.2f\n", totalDiscountValue);
+            printWriter.println("Invalid Lines: " + totalInvalidLines);
+            printWriter.println("================================");
+            printWriter.close();
+        } catch (FileNotFoundException e) {
+            System.out.println("File not found.");
+        } catch (IOException e) {
+            System.out.println(e.getMessage());
+        }
+
         // TODO:
         // 1. Build a formatted report string
         // 2. Include: