import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
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");
        }

        try (Scanner scanner = new Scanner(input))
        {
            while (scanner.hasNextLine())
            {
                String line = scanner.nextLine();

                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
        {
            loadProducts();
        } 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");
    }
}