Should I refactor this code?

The code is for a view debate page. The code is supposed to determine whether or not to show an add reply form to the viewing user.

If the user is logged in, and the user is not the creator of the debate, then check if the user already replied to the debate.

If the user did not already reply to the debate then show the form... Otherwise, Check If the user wants to edit their already existing reply by looking in the url for the reply id

If any of these tests dont pass, Then I save the reason as an int and pass that to a switch statement in the view.

The logic seems easy enough, but my code seems a little sloppy.

Here's the code.. (using Kohana V2.3.4)

public function view($id = 0)
{
    $debate = ORM::factory('debate')->with('user')->with('category')->find($id);

    if ($debate->loaded == FALSE)
    {
        url::redirect();
    }

    // series of tests to show an add reply form
    if ($this->logged_in)
    {
        // is the viewer the creator?
        if ($this->user->id != $debate->user->id)
        {
            // has the user already replied?
            if (ORM::factory('reply')
                ->where(array('debate_id' => $id, 'user_id' => $this->user->id))
                ->count_all() == 0)
            {
                $form = $errors = array
                (
                    'body'      => '',
                    'choice_id' => '',
                    'add'       => ''
                );

                if ($post = $this->input->post())
                {
                    $reply = ORM::factory('reply');

                    // validate and insert the reply
                    if ($reply->add($post, TRUE))
                    {
                        url::redirect(url::current());
                    }

                    $form   = arr::overwrite($form,   $post->as_array());
                    $errors = arr::overwrite($errors, $post->errors('reply_errors'));
                }
            }
            // editing a reply?
            else if (($rid = (int) $this->input->get('edit'))
                    AND ($reply = ORM::factory('reply')
                                ->where(array('debate_id' => $id, 'user_id' => $this->user->id))
                                ->find($rid)))
            {
                $form = $errors = array
                (
                    'body'      => '',
                    'choice_id' => '',
                    'add'       => ''
                );

                // autocomplete the form
                $form = arr::overwrite($form, $reply->as_array());

                if ($post = $this->input->post())
                {
                    // validate and insert the reply
                    if ($reply->edit($post, TRUE))
                    {
                        url::redirect(url::current());
                    }

                    $form   = arr::overwrite($form,   $post->as_array());
                    $errors = arr::overwrite($errors, $post->errors('reply_errors'));
                }
            }
            else
            {
                // user already replied
                $reason = 3;
            }
        }
        else
        {
            // user started the debate
            $reason = 2;
        }
    }
    else
    {
        // user is not logged in.
        $reason = 1;
    }

    $limits = Kohana::config('app/debate.limits');
    $page   = (int) $this->input->get('page', 1);
    $offset = ($page > 0) ? ($page - 1) * $limits['replies'] : 0;

    $replies = ORM::factory('reply')->with('user')->with('choice')->where('replies.debate_id', $id);

    $this->template->title  = $debate->topic;
    $this->template->debate = $debate;
    $this->template->body   = View::factory('debate/view')
        ->set('debate',     $debate)
        ->set('replies',    $replies->find_all($limits['replies'], $offset))
        ->set('pagination', Pagination::factory(array
            (
                'style'          => 'digg',
                'items_per_page' => $limits['replies'],
                'query_string'   => 'page',
                'auto_hide'      => TRUE,
                'total_items'    => $total = $replies->count_last_query()
            ))
        )
        ->set('total', $t开发者_如何学Pythonotal);

    // are we showing the add reply form?
    if (isset($form, $errors))
    {
        $this->template->body->add_reply_form = View::factory('reply/add_reply_form')
            ->set('debate', $debate)
            ->set('form',   $form)
            ->set('errors', $errors);
    }
    else
    {
        $this->template->body->reason = $reason;
    }
}

Heres the view, theres some logic in here that determines what message to show the user.

<!-- Add Reply Form -->
<?php if (isset($add_reply_form)): ?>

    <?php echo $add_reply_form; ?>

<?php else: ?>

    <?php
        switch ($reason)
        {
            case 1 :
                // not logged in, show a message
                $message = 'Add your ' . html::anchor('login?url=' . url::current(TRUE), '<b>vote</b>') . ' to this discussion';
                break;

            case 2 :
                // started the debate. dont show a message for that.
                $message = NULL;
                break;

            case 3:
                // already replied, show a message
                $message = 'You have already replied to this debate';
                break;

            default:
                // unknown reason. dont show a message
                $message = NULL;
                break;
        }
    ?>

    <?php echo app::show_message($message, 'h2'); ?>

<?php endif; ?>
<!-- End Add Reply Form -->

Should I refactor the add reply logic into another function or something.... It all works, it just seems real sloppy.

Thanks

Edit: I took all answers into consideration. Since I wasn't adding anything new at the moment and had time to kill, I chose to refactor the code. After a little thought, a better solution popped out to me. The whole process took me about 30 minutes, and I would say it was worth it. Thanks to all for your answers

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Yes, refactor. Remove the PHP and use a real language. ;)

Seriously though, do refactor - avoid nesting if statements so deeply (doing so obfuscates logic & makes testing harder) and chunk monolithic sections into separate functions/methods.

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No. If you've got one more line of code to write elsewhere on this project, spend your time on that instead.

As is often the case, there will be a ton of different ways to solve the same problem your code is solving. But if you've already solved the problem then take note of what you've learnt here and move on. If this code does turn out to be a weak link later on in development, then fine; you've got proof and a concrete validation that it should be re-factored. Until then you're wasting time that could be spent pushing the project forward by re-inventing your re-invention of the wheel.

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I'd say Yes. Refactor it, measure the time it takes you, then when all done assess the improvement. How much time did it take? Was it worth it? So refactor it as an experiment. And please let us know your results. Bottom line: was it worth refactoring?

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avoid nested if statement :)

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Yes, refactor. If you run a cyclomatic complexity analysis against this code, it would probably return a pretty high number (bad). Elaborate case/switch statements, nested if's all contribute to a higher score.

A future developer who may need to work with this codebase would potentially run a cyclomatic complexity analysis before diving in, and probably estimate that there is relatively high risk/complexity in dealing with this codebase.