Concept controller

Controller.php

<?php

class Controller
{
    protected $user;
    protected $service;

    public function __construct(User $user, Service $service)
    {
        $this->user = $user;
        $this->service = $service;
    }

    public function list(Collection $items): Output
    {
        $output = new Output();
        $output->setVariable('items', $items);

        return $output;
    }

    public function get(Item $item): Output
    {
        $output = new Output();
        $output->setVariable('item', $item);

        return $output;
    }

    public function create(Input $input): Output
    {
        $item = new Item();
        $data = $input->get('data');

        try {
            $service->serialize($item, $data);

            if (!$service->validate($item)) {
                throw new Exception('Not valid');
            }

            $service->create($item);

            $output->notify('alert.success', 'Item created');
            $output->setVariable('item', $item);
            $output->setStatus(Output::STATUS_OK);
        } catch (Exception $e) {
            $output->notify('alert.error', 'Failed to create');
            $output->notify('log.error', $e->getMessage());
            $output->setStatus(Output::STATUS_ERROR);
        }

        return $output;
    }

    public function update(Item $item, Input $input): Output
    {
        $data = $input->get('data');

        try {
            $service->serialize($item, $data);

            if (!$service->validate($item)) {
                throw new Exception('Not valid');
            }

            $service->update($item);

            $output->notify('alert.success', 'Item updated');
            $output->setVariable('item', $item);
            $output->setStatus(Output::STATUS_OK);
        } catch (Exception $e) {
            $output->notify('alert.error', 'Failed to update');
            $output->notify('log.error', $e->getMessage());
            $output->setStatus(Output::STATUS_ERROR);
        }

        return $output;
    }

    public function delete(Item $item, Input $input): Output
    {
        $output = new Output();

        if (!$input->confirm()) {
            $output->notify('alert.warning', 'Sure?');
            $output->setVariable('item', $item);
            $output->setStatus(Output::STATUS_OK);

            return $output;
        }

        try {
            if ($input->cancelled()) {
                $output->notify('alert.info', 'Delete canceled');
            } else {
                $service->delete($item);
                $output->notify('alert.success', 'Item deleted');
            }

            $output->setStatus(Output::STATUS_OK);
        } catch (Exception $e) {
            $output->notify('alert.error', 'Failed to delete');
            $output->notify('log.error', $e->getMessage());
            $output->setStatus(Output::STATUS_ERROR);
        }

        return $output;
    }
}