import "github.com/hibiken/asynq"

func main() {
    client := asynq.NewClient(&asynq.RedisOpt{
        Addr: "localhost:6379",
    })

    t1 := &asynq.Task{
        Type: "send_welcome_email",
        Payload: map[string]interface{}{
          "recipient_id": 1234,
        },
    }

    t2 := &asynq.Task{
        Type: "send_reminder_email",
        Payload: map[string]interface{}{
          "recipient_id": 1234,
        },
    }

    // process the task immediately.
    client.Process(t1, time.Now())

    // process the task 24 hours later.
    client.Process(t2, time.Now().Add(24 * time.Hour))
}

func main() {
    bg := asynq.NewBackground(10, &asynq.RedisOpt{
        Addr: "localhost:6379",
    })

    bg.Run(asynq.HandlerFunc(handler))
}

// if handler returns an error or panics, the task will be retried after some delay.
func handler(t *asynq.Task) error {
    switch t.Type {
        case "send_welcome_email":
            id, err := t.Payload.GetInt("recipient_id")
            if err != nil{
                return err
            }
            fmt.Printf("Send Welcome Email to %d\n", id)

        // ... handle other task types.

        default:
            return fmt.Errorf("unexpected task type: %s", t.Type)
    }
    return nil
}