diff --git a/src/main/java/Main.java b/src/main/java/Main.java index 148a46e..82ed83d 100644 --- a/src/main/java/Main.java +++ b/src/main/java/Main.java @@ -4,43 +4,65 @@ import java.util.ArrayList; import java.util.Collections; import java.util.Scanner; -public class Main { +public class Main +{ static ArrayList productCatalog = new ArrayList<>(); - public static void loadProducts() throws IOException{ + + public static void loadProducts() throws IOException + { InputStream input = Main.class .getClassLoader() .getResourceAsStream("products.csv"); - if (input == null) { + + if (input == null) + { 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 + try (Scanner scanner = new Scanner(input)) + { + while (scanner.hasNextLine()) + { + String line = scanner.nextLine(); - // NOTE - // - The data in products.csv is guaranteed to be valid. + if (line.trim().isEmpty()) continue; + + + String[] parts = line.split(","); + + if (parts.length >= 3) + { + int productId = Integer.parseInt(parts[0].trim()); + String name = parts[1].trim(); + double price = Double.parseDouble(parts[2].trim()); + + productCatalog.add(new Product(productId, name, price)); + } + } + } } public static void main(String[] args) { - try { + try + { loadProducts(); - } catch (IOException e) { - System.err.println("Error reading products"); + } catch (IOException e) + { + System.err.println("Error reading products: " + e.getMessage()); System.out.println("Terminating the program..."); return; } System.out.println("=== Products loaded"); + + ReportGenerator reportGenerator = new ReportGenerator("2025_order_details.csv", Collections.unmodifiableList(productCatalog)); reportGenerator.processFile(); System.out.println("=== Order file processed"); + + reportGenerator.saveReport(); System.out.println("=== Report saved as report.txt"); } -} +} \ No newline at end of file diff --git a/src/main/java/Product.java b/src/main/java/Product.java index dfc6aee..f4a2e64 100644 --- a/src/main/java/Product.java +++ b/src/main/java/Product.java @@ -1,23 +1,29 @@ -public class Product { +public class Product +{ private final int productID; private final String productName; private final double price; - public Product(int productID, String productName, double price) { + public Product(int productID, String productName, double price) + { this.productID = productID; this.productName = productName; this.price = price; } - public int getProductID() { + public int getProductID() + { return productID; } - public String getProductName() { + public String getProductName() + { return productName; } - public double getPrice() { + public double getPrice() + { return price; } } + diff --git a/src/main/java/ReportGenerator.java b/src/main/java/ReportGenerator.java index 8eb458b..d7da1ce 100644 --- a/src/main/java/ReportGenerator.java +++ b/src/main/java/ReportGenerator.java @@ -1,6 +1,12 @@ +import java.io.BufferedReader; +import java.io.FileReader; +import java.io.FileWriter; +import java.io.IOException; +import java.io.PrintWriter; import java.util.List; -public class ReportGenerator { + public class ReportGenerator + { private final String ordersFilePath; private final List productList; @@ -10,74 +16,93 @@ public class ReportGenerator { private double totalDiscountValue; private int totalInvalidLines; - public ReportGenerator(String ordersFilePath, List productList) { + public ReportGenerator(String ordersFilePath, List productList) + { this.ordersFilePath = ordersFilePath; this.productList = productList; } 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 + try (BufferedReader reader = new BufferedReader(new FileReader(ordersFilePath))) + { + + String line; + + while ((line = reader.readLine()) != null) + { + try + { + String[] parts = line.split(","); + + int productId = Integer.parseInt(parts[0].trim()); + int quantity = Integer.parseInt(parts[1].trim()); + int discountPercent = Integer.parseInt(parts[2].trim()); + + if (productId <= 0 || quantity <= 0 || discountPercent < 0 || discountPercent > 99) + { + totalInvalidLines++; + continue; + } + + Product product = findProductById(productId); + + if (product == null) + { + totalInvalidLines++; + continue; + } + + double subtotal = quantity * product.getPrice(); + double discountValue = subtotal * discountPercent / 100.0; + double finalCost = subtotal - discountValue; + + totalQuantity += quantity; + totalDiscountValue += discountValue; + totalFinalCost += finalCost; + + } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) + { + totalInvalidLines++; + } + } + + } catch (IOException e) + { + System.out.println("Error reading file: " + e.getMessage()); + } } + private Product findProductById(int productId) + { + for (Product product : productList) + { + if (product.getProductID() == productId) + { + return product; + } + } + + return null; + } + + + 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 + try (PrintWriter writer = new PrintWriter(new FileWriter("report.txt"))) + { - /* Example Structure - ========= SALES REPORT ========= - Total Quantity Sold: 42 - Total Final Cost: $1520.75 - Total Discount Value: $230.50 - Invalid Rows: 3 - ================================ - */ + writer.println("========= SALES REPORT ========="); + writer.println("Total Quantity Sold: " + totalQuantity); + writer.printf("Total Final Cost: $%.2f%n", totalFinalCost); + writer.printf("Total Discount Value: $%.2f%n", totalDiscountValue); + writer.println("Invalid Rows: " + totalInvalidLines); + writer.println("================================"); + + } catch (IOException e) + { + System.out.println("Error writing report: " + e.getMessage()); + } } } \ No newline at end of file