<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Form\Extension\Core\Type;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormBuilder;
use Symfony\Component\Form\Exception\CreationException;
use Symfony\Component\Form\Exception\FormException;
use Symfony\Component\Form\Extension\Core\ChoiceList\PaddedChoiceList;
use Symfony\Component\Form\Extension\Core\ChoiceList\MonthChoiceList;
use Symfony\Component\Form\FormView;
use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToLocalizedStringTransformer;
use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToArrayTransformer;
use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToStringTransformer;
use Symfony\Component\Form\Extension\Core\DataTransformer\DateTimeToTimestampTransformer;
use Symfony\Component\Form\ReversedTransformer;

class DateType extends AbstractType
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilder $builder, array $options)
    {
        $format = $options['format'];
        $pattern = null;

        $allowedFormatOptionValues = array(
            \IntlDateFormatter::FULL,
            \IntlDateFormatter::LONG,
            \IntlDateFormatter::MEDIUM,
            \IntlDateFormatter::SHORT,
        );

        // If $format is not in the allowed options, it's considered as the pattern of the formatter if it is a string
        if (!in_array($format, $allowedFormatOptionValues, true)) {
            if (is_string($format)) {
                $defaultOptions = $this->getDefaultOptions($options);

                $format = $defaultOptions['format'];
                $pattern = $options['format'];
            } else {
                throw new CreationException('The "format" option must be one of the IntlDateFormatter constants (FULL, LONG, MEDIUM, SHORT) or a string representing a custom pattern');
            }
        }

        $formatter = new \IntlDateFormatter(
            \Locale::getDefault(),
            $format,
            \IntlDateFormatter::NONE,
            \DateTimeZone::UTC,
            \IntlDateFormatter::GREGORIAN,
            $pattern
        );

        if ($options['widget'] === 'single_text') {
            $builder->appendClientTransformer(new DateTimeToLocalizedStringTransformer($options['data_timezone'], $options['user_timezone'], $format, \IntlDateFormatter::NONE, \IntlDateFormatter::GREGORIAN, $pattern));
        } else {
            $yearOptions = $monthOptions = $dayOptions = array();

            if ($options['widget'] === 'choice') {
                if (is_array($options['empty_value'])) {
                    $options['empty_value'] = array_merge(array('year' => null, 'month' => null, 'day' => null), $options['empty_value']);
                } else {
                    $options['empty_value'] = array('year' => $options['empty_value'], 'month' => $options['empty_value'], 'day' => $options['empty_value']);
                }

                // Only pass a subset of the options to children
                $yearOptions = array(
                    'choice_list' => new PaddedChoiceList(
                        array_combine($options['years'], $options['years']), 4, '0', STR_PAD_LEFT
                    ),
                    'empty_value' => $options['empty_value']['year'],
                    'required' => $options['required'],
                );
                $monthOptions = array(
                    'choice_list' => new MonthChoiceList(
                        $formatter, $options['months']
                    ),
                    'empty_value' => $options['empty_value']['month'],
                    'required' => $options['required'],
                );
                $dayOptions = array(
                    'choice_list' => new PaddedChoiceList(
                        array_combine($options['days'], $options['days']), 2, '0', STR_PAD_LEFT
                    ),
                    'empty_value' => $options['empty_value']['day'],
                    'required' => $options['required'],
                );
            }

            $builder
                ->add('year', $options['widget'], $yearOptions)
                ->add('month', $options['widget'], $monthOptions)
                ->add('day', $options['widget'], $dayOptions)
                ->appendClientTransformer(new DateTimeToArrayTransformer(
                    $options['data_timezone'], $options['user_timezone'], array('year', 'month', 'day')
                ))
            ;
        }

        if ($options['input'] === 'string') {
            $builder->appendNormTransformer(new ReversedTransformer(
                new DateTimeToStringTransformer($options['data_timezone'], $options['data_timezone'], 'Y-m-d')
            ));
        } else if ($options['input'] === 'timestamp') {
            $builder->appendNormTransformer(new ReversedTransformer(
                new DateTimeToTimestampTransformer($options['data_timezone'], $options['data_timezone'])
            ));
        } else if ($options['input'] === 'array') {
            $builder->appendNormTransformer(new ReversedTransformer(
                new DateTimeToArrayTransformer($options['data_timezone'], $options['data_timezone'], array('year', 'month', 'day'))
            ));
        }

        $builder
            ->setAttribute('formatter', $formatter)
            ->setAttribute('widget', $options['widget']);
    }

    /**
     * {@inheritdoc}
     */
    public function buildViewBottomUp(FormView $view, FormInterface $form)
    {
        $view->set('widget', $form->getAttribute('widget'));

        if ($view->hasChildren()) {
            $pattern = $form->getAttribute('formatter')->getPattern();

            // set right order with respect to locale (e.g.: de_DE=dd.MM.yy; en_US=M/d/yy)
            // lookup various formats at http://userguide.icu-project.org/formatparse/datetime
            if (preg_match('/^([yMd]+).+([yMd]+).+([yMd]+)$/', $pattern)) {
                $pattern = preg_replace(array('/y+/', '/M+/', '/d+/'), array('{{ year }}', '{{ month }}', '{{ day }}'), $pattern);
            } else {
                // default fallback
                $pattern = '{{ year }}-{{ month }}-{{ day }}';
            }

            $view->set('date_pattern', $pattern);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getDefaultOptions(array $options)
    {
        return array(
            'years'         => range(date('Y') - 5, date('Y') + 5),
            'months'        => range(1, 12),
            'days'          => range(1, 31),
            'widget'        => 'choice',
            'input'         => 'datetime',
            'format'        => \IntlDateFormatter::MEDIUM,
            'data_timezone' => null,
            'user_timezone' => null,
            'empty_value'   => null,
            // Don't modify \DateTime classes by reference, we treat
            // them like immutable value objects
            'by_reference'  => false,
        );
    }

    /**
     * {@inheritdoc}
     */
    public function getAllowedOptionValues(array $options)
    {
        return array(
            'input'     => array(
                'datetime',
                'string',
                'timestamp',
                'array',
            ),
            'widget'    => array(
                'single_text',
                'text',
                'choice',
            ),
        );
    }

    /**
     * {@inheritdoc}
     */
    public function getParent(array $options)
    {
        return $options['widget'] === 'single_text' ? 'field' : 'form';
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'date';
    }
}
