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

Reviewed-on: Arshida_0/HW-06-exceptions-and-file-handling-Arshida#1

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;
@@ -6,7 +8,7 @@ import java.util.Scanner;
 
 public class Main {
     static ArrayList<Product> productCatalog = new ArrayList<>();
-    public static void loadProducts() throws IOException{
+    public static void loadProducts() throws IOException {
         InputStream input = Main.class
                 .getClassLoader()
                 .getResourceAsStream("products.csv");
@@ -15,7 +17,7 @@ public class Main {
         }
         Scanner scanner = new Scanner(input);
 
-        // TODO:
+        // TODO:  .
         // - Read each line from products.csv
         // - For each line, parse productId, name, and price
         // - The format of the file is like this:
@@ -24,6 +26,17 @@ public class Main {
 
         // NOTE
         // - The data in products.csv is guaranteed to be valid.
+
+        while (scanner.hasNextLine()) {
+            String line = scanner.nextLine();
+            String[] fields = line.split(",");
+            int id = Integer.parseInt(fields[0]);
+            String name = fields[1];
+            double price = Double.parseDouble(fields[2]);
+            Product product = new Product(id, name, price);
+            productCatalog.add(product);
+        }
+        scanner.close();
     }
 
     public static void main(String[] args)

src/main/java/ReportGenerator.java

@@ -1,3 +1,4 @@
+import java.io.*;
 import java.util.List;
 
 public class ReportGenerator {
@@ -55,6 +56,55 @@ public class ReportGenerator {
         //      - increment totalInvalidLines
         //      - skip the line and continue processing the next line
         // 12. Close all file resources
+
+
+
+        try (FileReader fileReader = new FileReader(ordersFilePath)) {
+            BufferedReader bufferedReader = new BufferedReader(fileReader);
+            String line;
+            while ((line = bufferedReader.readLine()) != null) {
+                String[] fields = line.split(",");
+                try {
+                    int productId_rd = Integer.parseInt(fields[0]);
+                    int quantity_rd = Integer.parseInt(fields[1]);
+                    int discountPercent_rd = Integer.parseInt(fields[2]);
+
+                    if ((productId_rd <= 0)||(quantity_rd <= 0)||(discountPercent_rd < 0)||(discountPercent_rd > 99)) {
+                        totalInvalidLines++;
+                        continue;
+                    }
+
+                    boolean isTheId = false;
+
+                    for (Product p : productList) {
+                        if (p.getProductID() == productId_rd) {
+                            double subtotal = quantity_rd * p.getPrice();
+                            double discountValue = subtotal * discountPercent_rd / 100;
+                            double finalCost = subtotal - discountValue;
+                            totalFinalCost += finalCost;
+                            totalQuantity += quantity_rd;
+                            totalDiscountValue += discountValue;
+                            isTheId = true;
+                            break;
+                        }
+                    }
+
+                    if (!isTheId) {
+                        totalInvalidLines++;
+                    }
+                }
+                catch (NumberFormatException e) {
+                    totalInvalidLines++;
+                }
+            }
+            bufferedReader.close();
+        }
+        catch (IOException e) {
+            System.out.println("Can't read " + ordersFilePath);
+            System.out.println(e.getMessage());
+        }
+
+
     }
 
     public void saveReport()
@@ -79,5 +129,17 @@ public class ReportGenerator {
         Invalid Rows: 3
         ================================
         */
+
+        String report_format = "========= SALES REPORT =========\nTotal Quantity Sold: %d\nTotal Final Cost: %.4f\nTotal Discount Value: %.4f\nInvalid Rows: %d\n================================\n";
+        String report_str = String.format(report_format, totalQuantity, totalFinalCost, totalDiscountValue, totalInvalidLines);
+
+        try (FileWriter fw = new FileWriter("report.txt", true)) {
+            BufferedWriter bw = new BufferedWriter(fw);
+            bw.write(report_str);
+            bw.close();
+        }
+        catch (IOException e) {
+            System.out.println(e.getMessage());
+        }
     }
 }