completing all files

src/main/java/Main.java

@@ -1,3 +1,5 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
@@ -6,6 +8,7 @@ import java.util.Scanner;
 
 public class Main {
     static ArrayList<Product> productCatalog = new ArrayList<>();
+
     public static void loadProducts() throws IOException{
         InputStream input = Main.class
                 .getClassLoader()
@@ -13,15 +16,25 @@ public class Main {
         if (input == null) {
             throw new IOException("products.csv not found");
         }
-        Scanner scanner = new Scanner(input);
 
-        // TODO:
+        try (Scanner scanner = new Scanner(input)) {
-        // - Read each line from products.csv
-        // - For each line, parse productId, name, and price
-        // - The format of the file is like this:
-        //      [productId],[name],[price]
-        // - Store Product objects in the productCatalog ArrayList
 
+            while (scanner.hasNextLine()) {
+
+                String line = scanner.nextLine();
+                String[] items = line.split(",");
+
+                int productId = Integer.parseInt(items[0].trim());
+                String name = items[1].trim();
+                double price = Double.parseDouble(items[2].trim());
+
+                Product product = new Product(productId, name, price);
+                productCatalog.add(product);
+            }
+
+        } catch (Exception e) {
+            System.out.println(e.getMessage());
+        }
         // NOTE
         // - The data in products.csv is guaranteed to be valid.
     }
@@ -42,5 +55,6 @@ public class Main {
         System.out.println("=== Order file processed");
         reportGenerator.saveReport();
         System.out.println("=== Report saved as report.txt");
+
     }
 }

src/main/java/ReportGenerator.java

@@ -1,14 +1,18 @@
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.util.ArrayList;
 import java.util.List;
+import java.io.*;
 
 public class ReportGenerator {
 
     private final String ordersFilePath;
     private final List<Product> productList;
 
-    private double totalFinalCost;
+    private double totalFinalCost = 0;
-    private int totalQuantity;
+    private int totalQuantity = 0;
-    private double totalDiscountValue;
+    private double totalDiscountValue = 0;
-    private int totalInvalidLines;
+    private int totalInvalidLines = 0;
 
     public ReportGenerator(String ordersFilePath, List<Product> productList) {
         this.ordersFilePath = ordersFilePath;
@@ -17,9 +21,70 @@ public class ReportGenerator {
 
     public void processFile()
     {
+
         // TODO:
         // 1. Open the order details CSV file
         // 2. Read the file line by line
+        try {
+            FileReader reader = new FileReader(this.ordersFilePath);
+            BufferedReader bufferedReader = new BufferedReader(reader);
+
+            String line;
+
+            while ((line = bufferedReader.readLine()) != null) {
+                try {
+
+                    String[] values = line.split(",");
+
+                    // Convert to integers
+                    int productId = Integer.parseInt(values[0].trim());
+                    int quantity = Integer.parseInt(values[1].trim());
+                    int discountPercent = Integer.parseInt(values[2].trim());
+
+                    // Validate values
+                    if (productId <= 0 || productId > 9 || quantity <= 0 || discountPercent < 0 || discountPercent > 99) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+
+                    // Check if product exists in productList?
+                    Product product = null;
+                    for (Product p : productList) {
+                        if (p.getProductID() == productId) {
+                            product = p;
+                            break;
+                        }
+                    }
+
+                    if (product == null) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+                    else {
+                        double subtotal = quantity * product.getPrice();
+                        double discountValue = subtotal * discountPercent / 100;
+                        double finalCost = subtotal - discountValue;
+
+                        totalQuantity += quantity;
+                        totalDiscountValue += discountValue;
+                        totalFinalCost += finalCost;
+                    }
+
+                } catch (NumberFormatException e) {
+
+                    totalInvalidLines++;
+                    continue;
+                }
+            }
+
+            bufferedReader.close();
+            reader.close();
+
+        } catch (FileNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
         // 3. Split each line using comma delimiter
         //      (each line is guaranteed to contain exactly two commas)
         // 4. Each line contains exactly 3 values in the format:
@@ -71,13 +136,28 @@ public class ReportGenerator {
         // 5. Handle file writing exceptions
         // 6. Close writer resources
 
+        try {
+            FileWriter writer = new FileWriter("report.txt");
+            writer.write("========= SALES REPORT =========\n");
+            writer.write("Total Quantity Sold: " + totalQuantity);
+            writer.write(String.format("\nTotal Final Cost: $%.2f", totalFinalCost));
+            writer.write(String.format("\nTotal Discount Value: $%.2f", totalDiscountValue));
+            writer.write("\nInvalid Rows: " + totalInvalidLines);
+            writer.write("\n================================");
+
+            writer.close();
+
+        } catch (Exception e) {
+            System.out.println(e.getMessage());
+        }
+
         /* Example Structure
         ========= SALES REPORT =========
         Total Quantity Sold: 42
         Total Final Cost: $1520.75
         Total Discount Value: $230.50
         Invalid Rows: 3
-        ================================
+        =================================
         */
     }
 }