HW6

src/main/java/Main.java

@@ -6,41 +6,53 @@ import java.util.Scanner;
 
 public class Main {
     static ArrayList<Product> productCatalog = new ArrayList<>();
-    public static void loadProducts() throws IOException{
-        InputStream input = Main.class
-                .getClassLoader()
-                .getResourceAsStream("products.csv");
-        if (input == null) {
-            throw new IOException("products.csv not found");
-        }
-        Scanner scanner = new Scanner(input);
 
-        // TODO:
+    public static void main(String[] args) {
-        // - 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
-
-        // NOTE
-        // - The data in products.csv is guaranteed to be valid.
-    }
-
-    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...");
+            System.err.println("Terminating the program...");
             return;
         }
-        System.out.println("=== Products loaded");
 
-        ReportGenerator reportGenerator = new ReportGenerator("2025_order_details.csv", Collections.unmodifiableList(productCatalog));
+        System.out.println("=== Products loaded ===");
-        reportGenerator.processFile();
+
-        System.out.println("=== Order file processed");
+        ReportGenerator generator = new ReportGenerator("2025_order_details.csv", Collections.unmodifiableList(productCatalog));
-        reportGenerator.saveReport();
+
-        System.out.println("=== Report saved as report.txt");
+        System.out.println("Processing orders...");
+        generator.processFile();
+
+        System.out.println("Saving report...");
+        generator.saveReport();
+
+        System.out.println("Done!");
+    }
+
+    private static void loadProducts() throws IOException {
+        InputStream inputStream = Main.class.getClassLoader().getResourceAsStream("products.csv");
+        if (inputStream == null) {
+            throw new IOException("products.csv not found");
+        }
+
+        try (Scanner scanner = new Scanner(inputStream)) {
+            // خواندن خط به خط فایل محصولات
+            while (scanner.hasNextLine()) {
+                String line = scanner.nextLine().trim();
+                // نادیده گرفتن خطوط خالی یا هدر (در صورت وجود)
+                if (line.isEmpty() || line.toLowerCase().startsWith("productid")) {
+                    continue;
+                }
+
+                String[] parts = line.split(",");
+                if (parts.length >= 3) {
+                    int id = Integer.parseInt(parts[0].trim());
+                    String name = parts[1].trim();
+                    double price = Double.parseDouble(parts[2].trim());
+
+                    productCatalog.add(new Product(id, name, price));
+                }
+            }
+        }
     }
 }

src/main/java/ReportGenerator.java

@@ -1,83 +1,98 @@
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
 import java.util.List;
 
 public class ReportGenerator {
-
     private final String ordersFilePath;
     private final List<Product> productList;
 
-    private double totalFinalCost;
+    private double totalFinalCost = 0.0;
-    private int totalQuantity;
+    private int totalQuantity = 0;
-    private double totalDiscountValue;
+    private double totalDiscountValue = 0.0;
-    private int totalInvalidLines;
+    private int totalInvalidLines = 0;
 
     public ReportGenerator(String ordersFilePath, List<Product> productList) {
         this.ordersFilePath = ordersFilePath;
         this.productList = productList;
     }
 
-    public void processFile()
+    public void processFile() {
-    {
+
-        // TODO:
+        try (BufferedReader br = new BufferedReader(new FileReader(ordersFilePath))) {
-        // 1. Open the order details CSV file
+            String line;
-        // 2. Read the file line by line
+            while ((line = br.readLine()) != null) {
-        // 3. Split each line using comma delimiter
+                line = line.trim();
-        //      (each line is guaranteed to contain exactly two commas)
+                if (line.isEmpty() || line.toLowerCase().startsWith("productid")) {
-        // 4. Each line contains exactly 3 values in the format:
+                    continue;
-        //      [productId],[quantity],[discountPercent]
-        // 5. Attempt to convert values:
-        //      - productId -> int
-        //      - quantity -> int
-        //      - discountPercent -> int
-        //    NOTE:
-        //      - quantity and discountPercent may contain invalid characters
-        //        (e.g., letters instead of numbers).
-        //      - If parsing any value fails (NumberFormatException),
-        //        the entire line must be considered invalid.
-        //      - Use try-catch blocks and exception handling to safely
-        //        handle parsing and validation errors without stopping
-        //        the processing of the remaining lines.
-        // 6. Validate parsed values:
-        //      - productId must be greater than 0
-        //      - quantity must be greater than 0
-        //      - discountPercent must be between 0 and 99 inclusive
-        // 7. Look for a Product in productList that matches productId
-        // 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:
-        //      subtotal = quantity * product price
-        //      discountValue = subtotal * discountPercent / 100
-        //      finalCost = subtotal - discountValue
-        // 10. Update report totals:
-        //      - totalQuantity += quantity
-        //      - totalFinalCost += finalCost
-        //      - totalDiscountValue += discountValue
-        // 11. If any parsing error, validation failure, or missing product occurs:
-        //      - increment totalInvalidLines
-        //      - skip the line and continue processing the next line
-        // 12. Close all file resources
                 }
 
-    public void saveReport()
+                String[] parts = line.split(",");
-    {
+                if (parts.length < 3) {
-        // TODO:
+                    totalInvalidLines++;
-        // 1. Build a formatted report string
+                    continue;
-        // 2. Include:
+                }
-        //      - total quantity
-        //      - total final cost
-        //      - total discount value
-        //      - total invalid lines
-        // 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
+                try {
-        ========= SALES REPORT =========
+
-        Total Quantity Sold: 42
+                    int productId = Integer.parseInt(parts[0].trim());
-        Total Final Cost: $1520.75
+                    int quantity = Integer.parseInt(parts[1].trim());
-        Total Discount Value: $230.50
+                    int discountPercent = Integer.parseInt(parts[2].trim());
-        Invalid Rows: 3
+
-        ================================
+
-        */
+                    if (productId <= 0 || quantity <= 0 || discountPercent < 0 || discountPercent > 99) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+
+
+                    Product matchedProduct = null;
+                    for (Product product : productList) {
+                        if (product.getProductID() == productId) {
+                            matchedProduct = product;
+                            break;
+                        }
+                    }
+
+                    if (matchedProduct == null) {
+                        totalInvalidLines++;
+                        continue; // محصول یافت نشد
+                    }
+
+                    double subtotal = quantity * matchedProduct.getPrice();
+                    double discountValue = subtotal * (discountPercent / 100.0);
+                    double finalCost = subtotal - discountValue;
+
+
+                    totalQuantity += quantity;
+                    totalDiscountValue += discountValue;
+                    totalFinalCost += finalCost;
+
+                } catch (NumberFormatException e) {
+
+                    totalInvalidLines++;
+                }
+            }
+        } catch (IOException e) {
+            System.err.println("Error reading orders file: " + e.getMessage());
+        }
+    }
+
+    public void saveReport() {
+
+        try (BufferedWriter bw = new BufferedWriter(new FileWriter("report.txt"))) {
+            bw.write("========= SALES REPORT =========\n");
+            bw.write("Total Quantity Sold: " + totalQuantity + "\n");
+            // استفاده از String.format برای نمایش دو رقم اعشار
+            bw.write(String.format("Total Final Cost: $%.2f\n", totalFinalCost));
+            bw.write(String.format("Total Discount Value: $%.2f\n", totalDiscountValue));
+            bw.write("Invalid Rows: " + totalInvalidLines + "\n");
+            bw.write("================================\n");
+
+        } catch (IOException e) {
+            System.err.println("Error saving report: " + e.getMessage());
+        }
     }
 }