<?php

namespace Chill\ActivityBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Chill\MainBundle\Form\Type\AppendScopeChoiceTypeTrait;
use Chill\MainBundle\Security\Authorization\AuthorizationHelper;
use Doctrine\Common\Persistence\ObjectManager;
use Chill\MainBundle\Templating\TranslatableStringHelper;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Chill\MainBundle\Entity\User;
use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToTimestampTransformer;
use Symfony\Component\Form\FormEvent;
use Symfony\Component\Form\FormEvents;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\Form\Extension\Core\Type\DateTimeType;
use Chill\ActivityBundle\Form\Type\TranslatableActivityType;
use Chill\ActivityBundle\Form\Type\TranslatableActivityReason;

class ActivityType extends AbstractType
{
    
    use AppendScopeChoiceTypeTrait;
    
    /**
     * the user running this form
     *
     * @var User
     */
    protected $user;
    
    /**
     *
     * @var AuthorizationHelper
     */
    protected $authorizationHelper;
    
    /**
     *
     * @var ObjectManager
     */
    protected $om;
    
    /**
     *
     * @var TranslatableStringHelper
     */
    protected $translatableStringHelper;
    
    protected $timeChoices;
    
    public function __construct(
            TokenStorageInterface $tokenStorage, 
            AuthorizationHelper $authorizationHelper, ObjectManager $om, 
            TranslatableStringHelper $translatableStringHelper,
            array $timeChoices
            ) 
    {
        if (!$tokenStorage->getToken()->getUser() instanceof User) {
            throw new \RuntimeException("you should have a valid user");
        }
        $this->user = $tokenStorage->getToken()->getUser();
        $this->authorizationHelper = $authorizationHelper;
        $this->om = $om;
        $this->translatableStringHelper = $translatableStringHelper;
        $this->timeChoices = $timeChoices;
    }
    
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        // handle times choices
        $timeChoices = array();
        
        foreach ($this->timeChoices as $e) {
            $timeChoices[$e['label']] = $e['seconds'];
        };
        
        $durationTimeTransformer = new DateTimeToTimestampTransformer('GMT', 'GMT');
        $durationTimeOptions = array(
                'choices' => $timeChoices,
                'choices_as_values' => true,
                'placeholder' => 'Choose the duration',
        );
        
        $builder
            ->add('date', 'date', array(
               'required' => true, 
               'widget' => 'single_text', 
               'format' => 'dd-MM-yyyy')
            )
            ->add('durationTime', ChoiceType::class, $durationTimeOptions)
            ->add('remark', 'textarea', array(
               'required' => false,
               'empty_data' => ''
            ))            
            ->add('attendee', ChoiceType::class, array(
               'expanded' => true,
               'required' => false,
               'choices' => array(
                  true => 'present',
                  false => 'not present'
               )
            ))
            ->add('user')
            ->add('scope')
            ->add('reasons', TranslatableActivityReason::class, array(
                'multiple' => true,
                'required' => false
            ))
            ->add('type', TranslatableActivityType::class, array(
                'placeholder' => 'Choose a type',
                'active_only' => true
            ))
        ;
        
        $this->appendScopeChoices($builder, $options['role'], 
              $options['center'], $this->user, $this->authorizationHelper, 
              $this->translatableStringHelper, $this->om);
        
        $builder->get('durationTime')
                ->addModelTransformer($durationTimeTransformer);
        
        
        $builder->get('durationTime')
                ->addEventListener(
                        FormEvents::PRE_SET_DATA, 
                        function(FormEvent $formEvent) use (
                                $timeChoices, 
                                $builder,
                                $durationTimeTransformer,
                                $durationTimeOptions
                                ) 
                        {
                            // set the timezone to GMT, and fix the difference between current and GMT
                            // the datetimetransformer will then handle timezone as GMT
                            $timezoneUTC = new \DateTimeZone('GMT');
                            /* @var $data \DateTime */
                            $data = $formEvent->getData() === NULL ? 
                                    \DateTime::createFromFormat('U', 300) :
                                    $formEvent->getData();
                            $seconds = $data->getTimezone()->getOffset($data);
                            $data->setTimeZone($timezoneUTC);
                            $data->add(new \DateInterval('PT'.$seconds.'S'));

                            // test if the timestamp is in the choices. 
                            // If not, recreate the field with the new timestamp
                            if (!in_array($data->getTimestamp(), $timeChoices)) {
                                // the data are not in the possible values. add them
                                $timeChoices[$data->format('H:i')] = $data->getTimestamp();
                                $form = $builder->create(
                                        'durationTime', 
                                        ChoiceType::class, 
                                        array_merge(
                                                $durationTimeOptions,
                                                array(
                                                    'choices' => $timeChoices,
                                                    'auto_initialize' => false
                                                )
                                                ));
                                $form->addModelTransformer($durationTimeTransformer);
                                $formEvent->getForm()->getParent()->add($form->getForm());
                            }
                        });
    }
    
    /**
     * @param OptionsResolverInterface $resolver
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Chill\ActivityBundle\Entity\Activity'
        ));
        
        $this->appendScopeChoicesOptions($resolver);
    }

    /**
     * @return string
     */
    public function getName()
    {
        return 'chill_activitybundle_activity';
    }
}