Merge pull request 'tamrin 6' (#1) from develop into main

Reviewed-on: navid299/HW-06-exceptions-and-file-handling#1

src/main/java/Main.java

@@ -14,20 +14,19 @@ public class Main {
             throw new IOException("products.csv not found");
         }
         Scanner scanner = new Scanner(input);
-
-        // TODO:
-        // - 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.
+        while (scanner.hasNextLine()){
+            String line = scanner.nextLine();
+            String[] lineArray = line.split(",");
+            int productID = Integer.parseInt(lineArray[0]);
+            String productName = lineArray[1];
+            double price =  Double.parseDouble(lineArray[2]);
+            Product pro = new Product(productID ,productName,price);
+            productCatalog.add(pro);
+        }
     }
 
-    public static void main(String[] args)
-    {
+    public static void main(String[] args) throws IOException {
+
         try {
             loadProducts();
         } catch (IOException e) {

src/main/java/ReportGenerator.java

@@ -1,4 +1,9 @@
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileWriter;
+import java.io.IOException;
 import java.util.List;
+import java.util.Scanner;
 
 public class ReportGenerator {
 
@@ -13,71 +18,93 @@ public class ReportGenerator {
     public ReportGenerator(String ordersFilePath, List<Product> productList) {
         this.ordersFilePath = ordersFilePath;
         this.productList = productList;
+        totalFinalCost = 0 ;
+        totalQuantity = 0;
+        totalDiscountValue = 0;
+        totalInvalidLines = 0 ;
     }
 
-    public void processFile()
-    {
-        // TODO:
-        // 1. Open the order details CSV file
-        // 2. Read the file line by line
-        // 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:
-        //      [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 processFile() throws FileNotFoundException {
+        File file = new File(ordersFilePath);
+        Scanner in = new Scanner(file);
 
-    public void saveReport()
-    {
-        // TODO:
-        // 1. Build a formatted report string
-        // 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
+        while (in.hasNextLine()){
+            String line = in.nextLine();
+            String[] lineArray = line.split(",");
+            int productId;
+            int quantity;
+            int discountPercent;
 
-        /* Example Structure
-        ========= SALES REPORT =========
-        Total Quantity Sold: 42
-        Total Final Cost: $1520.75
-        Total Discount Value: $230.50
-        Invalid Rows: 3
-        ================================
-        */
+            try {
+                 productId = Integer.parseInt(lineArray[0]);
+            }catch (NumberFormatException e){
+                totalInvalidLines += 1;
+                continue;
+            }
+            if (productId <= 0 )  {
+                totalInvalidLines +=1;
+                continue;
+            }
+            try {
+                quantity = Integer.parseInt(lineArray[1]);
+
+            }catch (NumberFormatException e){
+                totalInvalidLines += 1;
+                continue;
+            }
+            if (quantity <= 0  )  {
+                totalInvalidLines +=1;
+                continue;
+            }
+            try {
+                discountPercent = Integer.parseInt(lineArray[2]);
+
+            }catch (NumberFormatException e){
+                totalInvalidLines +=1 ;
+                continue;
+            }
+            if (discountPercent < 0 || discountPercent> 99 )  {
+                totalInvalidLines +=1;
+                continue;
+            }
+            boolean productIdExist = false;
+            Product pro = null ;
+            for (Product product : productList) {
+                if (product.getProductID() == productId) {
+                    pro = product;
+                    productIdExist = true;
+                    break;
+                }
+            }
+            if (!productIdExist){
+                totalInvalidLines += 1 ;
+                continue;
+            }
+
+            double subtotal = quantity * pro.getPrice();
+            double discountValue = subtotal * ((double) discountPercent / 100);
+            double finalCost = subtotal - discountValue;
+
+
+            totalQuantity += quantity;
+            totalFinalCost += finalCost;
+            totalDiscountValue += discountValue;
+            }
+            in.close();
+        }
+
+
+    public void saveReport() throws IOException {
+        String report = "";
+        report += ("========= SALES REPORT ========="+"\n");
+        report += ("Total Quantity Sold: "+totalQuantity+"\n");
+        report += ("Total Final Cost: $"+totalFinalCost+"\n");
+        report += ("Total Discount Value: $"+totalDiscountValue+"\n");
+        report += ("Invalid Rows: "+totalInvalidLines+"\n");
+        report += ("================================"+"\n");
+        File file = new File("report.txt");
+        FileWriter fileWriter = new FileWriter(file);
+        fileWriter.write(report);
+        fileWriter.close();
     }
 }