<?php

namespace WorkflowBundle\Twig;

use Symfony\Component\Workflow\Registry;

class WorkflowExtension extends \Twig_Extension
{
    private $workflowRegistry;

    public function __construct(Registry $workflowRegistry)
    {
        $this->workflowRegistry = $workflowRegistry;
    }

    public function getFunctions()
    {
        return array(
            new \Twig_SimpleFunction('workflow_can', array($this, 'canTransition')),
            new \Twig_SimpleFunction('workflow_transitions', array($this, 'getEnabledTransitions')),
            new \Twig_SimpleFunction('workflow_correct_state', array($this, 'isCorrectState')),
            new \Twig_SimpleFunction('get_class', array($this, 'getClass'))
        );
    }

    public function isCorrectState($object, $name = null) 
    {
        try {
            $places = $this->workflowRegistry->get($object, $name)->getDefinition()->getPlaces();
        } catch (\Exception $e) {
            $places = array();
        }

        $state = $object->getCurrentState();
        
        if(is_null($state)) return false;

        if(isset($places[$state])) return true;

        return false;
    }

    public function canTransition($object, $transition, $name = null)
    {
        return $this->workflowRegistry->get($object, $name)->can($object, $transition);
    }

    public function getEnabledTransitions($object, $name = null)
    {
        try {
            $return = $this->workflowRegistry->get($object, $name)->getEnabledTransitions($object);
        } catch (\Exception $e) {
            $return = array();
        }
        
        return $return;
    }

    public function getName()
    {
        return 'workflow';
    }

    public function getClass($object)
    {
        return get_class($object);
    }
}