import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.stereotype.Service;

@App
public class Base {
    public static void main(String[] args) {
        SpringApplication.run(Base.class, args);
    }
}

// Controller Layer
@RestController
class GreetingController {

    private final GreetingService greetingService;

    // Constructor-based Dependency Injection
    public GreetingController(GreetingService greetingService) {
        this.greetingService = greetingService;
    }

    @GetMapping("/greet")
    public String greet(@RequestParam(value = "name", defaultValue = "World") String name) {
        return greetingService.getGreetingMessage(name);
    }
}

// Service Layer
@Service
class GreetingService {
    public String getGreetingMessage(String name) {
        return "Hello, " + name + "! Welcome to the BPE Window";
    }
}

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