import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.*;

@RestController
public class CheckoutController {
    @GetMapping("/checkout")
    public Map checkout(
            @RequestParam String products,
            @RequestParam(required = false) String coupon) {

        // Parse products
        Map productQuantities = new HashMap<>();
        for (String productEntry : products.split(",")) {
            String[] parts = productEntry.split(":");
            productQuantities.put(
                    parts[0], // Product ID
                    Integer.parseInt(parts[1]) // Quantity
            );
        }

        // Build result
        Map result = new HashMap<>();
        result.put("products", productQuantities);
        result.put("coupon", coupon != null ? coupon : "No coupon applied");

        return result;
    }
}