Merge pull request 'HW-06' (#1) from develop into main

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

90 / 100

problems  :

1 - Validation : if(id<=0 || quantity<=0 || discountPercent<0 || discountPercent>99)
test : 1,5,120 -> wrong output

2 - totalDiscountValue

src/main/java/Main.java

@@ -1,7 +1,10 @@
 import java.io.IOException;
 import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.List;
 import java.util.Scanner;
 
 public class Main {
@@ -15,6 +18,20 @@ public class Main {
         }
         Scanner scanner = new Scanner(input);
 
+        int productId=0;
+        String name=" ";
+        double price=0;
+
+        while (scanner.hasNextLine()) {
+            String line = scanner.nextLine();
+            String[] parts = line.split(",");
+            productId = Integer.parseInt(parts[0]);
+            price= Double.parseDouble(parts[2]);
+            Product p= new Product(productId, parts[1],price);
+            productCatalog.add(p);
+            }
+
+
         // TODO:
         // - Read each line from products.csv
         // - For each line, parse productId, name, and price

src/main/java/ReportGenerator.java

@@ -1,4 +1,7 @@
 import java.util.List;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.io.IOException;
 
 public class ReportGenerator {
 
@@ -17,6 +20,54 @@ public class ReportGenerator {
 
     public void processFile()
     {
+        try {
+            List<String> lines = Files.readAllLines(Paths.get(ordersFilePath));
+
+            for(String line: lines)
+            {
+                String[] parts = line.split(",");
+                int id=0;
+                int quantity=0;
+                int discountPercent=0;
+                double subtotal=0;
+                double discountValue=0;
+                double finalCost=0;
+
+                try {
+                    id = Integer.parseInt(parts[0]);
+                    quantity=Integer.parseInt(parts[1]);
+                    discountPercent=Integer.parseInt(parts[2]);
+
+                    if(id<=0 || quantity<=0 || discountPercent<0 || discountPercent>99) {
+                        totalDiscountValue++;
+                        continue;
+                    }
+                    if(!exist(id, productList)) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+
+                    for(Product p:productList)
+                    {
+                        if(id== p.getProductID())
+                        {
+                            subtotal = quantity * p.getPrice();
+                            discountValue = subtotal * discountPercent / 100;
+                            finalCost = subtotal - discountValue;
+                        }
+                    }
+
+                    totalQuantity += quantity;
+                    totalFinalCost += finalCost;
+                }
+                catch (NumberFormatException e) {
+                    continue;
+                }
+            }
+        }
+        catch (IOException e) {
+            e.printStackTrace();
+        }
         // TODO:
         // 1. Open the order details CSV file
         // 2. Read the file line by line
@@ -57,8 +108,33 @@ public class ReportGenerator {
         // 12. Close all file resources
     }
 
+    public boolean exist(int id, List<Product> productList)
+    {
+        for(Product p:productList)
+        {
+            if(id== p.getProductID())
+                return true;
+        }
+        return false;
+    }
+
     public void saveReport()
     {
+            String report = "========= SALES REPORT =========\n";
+            report += "Total Quantity Sold: " + totalQuantity + "\n";
+            report += "Total Final Cost: $" + String.format("%.2f", totalFinalCost) + "\n";
+            report += "Total Discount Value: $" + String.format("%.2f", totalDiscountValue) + "\n";
+            report += "Invalid Rows: " + totalInvalidLines + "\n";
+            report += "================================\n";
+
+            try {
+                Files.writeString(Paths.get("report.txt"), report);
+                System.out.println("Report saved successfully!");
+            } catch (IOException e) {
+                System.err.println("Error saving report: " + e.getMessage());
+                e.printStackTrace();
+
+        }
         // TODO:
         // 1. Build a formatted report string
         // 2. Include: