refactoring-1.kt

fun onClickLikeButton() {
    if (viewModel.liked) {
        removeLike()
    } else {
        addLike()
    }
}

private fun addLike() {
    
    //First we update the local model so the user feels the action is instantaneous
    viewModel.liked = true
    viewModel.count++

    //Then we call the API to update it on the server
    apiService.addLike.enqueue({ response -> 

        //If everything goes right, we update the model with the information from the server
        viewModel.count = response.count

    }, { failure ->

        //If any error occurs we should let the user know and go back to the previous state
        Toast.makeToast(activity, "Ops, an error occurred", LENGTH_LONG).show() 

        viewModel.liked = false
        viewModel.count--
    })
}

private removeLike() {
    
    //First we update the local model so the user feels the action is instantaneous
    viewModel.liked = false
    viewModel.count--

    //Then we call the API to update it on the server
    apiService.removeLike.enqueue({ response -> 

        //If everything goes right, we update the model with the information from the server
        viewModel.count = response.count

    }, { failure ->

        //If any error occurs we should let the user know and go back to the previous state
        Toast.makeToast(activity, "Ops, an error occurred", LENGTH_LONG).show() 

        viewModel.liked = true
        viewModel.count++
    })
}