package adapter;

/**
 * Adapter Design Pattern — Runnable Demo
 *
 * Demonstrates wrapping an incompatible StripeClient behind
 * the PaymentGateway interface your application expects.
 *
 * Run: javac adapter/*.java && java adapter.Main
 * Article: https://ankurm.com/adapter-design-pattern-java/
 */
public class Main {

    public static void main(String[] args) {
        System.out.println("=== Adapter Design Pattern Demo ===\n");

        // --- Object Adapter: Stripe ---
        System.out.println("-- Using Stripe via Adapter --");
        StripeClient stripeClient = new StripeClient("sk_test_4eC39HqLyjWDarjtT1zdp7dc");
        PaymentGateway stripeGateway = new StripePaymentAdapter(stripeClient);

        OrderService orderService = new OrderService(stripeGateway);
        orderService.processOrder("ORD-001", "cus_abc123", 99.99);

        System.out.println("\n-- Testing refund --");
        boolean refunded = stripeGateway.refund("ch_ORD-001", 99.99);
        System.out.println("Refund issued: " + refunded);

        // --- JDK Example: InputStreamReader as Adapter ---
        System.out.println("\n-- JDK Adapter: InputStreamReader --");
        // InputStreamReader adapts InputStream (byte-based) to Reader (char-based)
        // The client (BufferedReader) only knows about Reader, not InputStream
        System.out.println("InputStreamReader wraps System.in (InputStream) as a Reader.");
        System.out.println("Your code reads chars; the adapter handles byte-to-char conversion.");

        System.out.println("\n=== Demo complete ===");
    }
}