package main

import (
	"context"
	"fmt"
	"log"

	"github.com/screwyprof/interactor/v2"
)

// TestRequest represents a test request.
type TestRequest struct{}

// TestResponse represents a test response.
type TestResponse struct {
	Result int
}

// UseCase is an example use case implementation.
type UseCase struct {
	Res int
}

// Run runs the use case with the given request.
//
// The response is returned by reference to avoid extra allocations.
func (uc UseCase) Run(ctx context.Context, req TestRequest, res *TestResponse) error {
	res.Result = uc.Res
	return nil
}

func main() {
	// Create a use case.
	useCaseRunner := &UseCase{Res: 42}

	// Create a new dispatcher and register the use case runner.
	dispatcher := interactor.NewDispatcher()
	dispatcher.Register(TestRequest{}, interactor.MustAdapt(useCaseRunner.Run))

	// Run the use case
	var res TestResponse
	if err := dispatcher.Run(context.Background(), TestRequest{}, &res); err != nil {
		log.Fatal(err)
	}

	fmt.Printf("The answer to life, the universe, and everything: %d\n", res.Result)
}