<?php

namespace App\Event\Form\Element;

use App\Event\Model as EventModel;
use Qs_Array;
use Zend_Form_Element_Xhtml;

class ProductList extends Zend_Form_Element_Xhtml
{
    protected $_isArray = false;

    protected $_eventId;
    protected $_products;

    public function loadDefaultDecorators()
    {
        if ($this->loadDefaultDecoratorsIsDisabled()) {
            return $this;
        }

        $decorators = $this->getDecorators();
        if (empty($decorators)) {
            $this->addDecorator('ProductList')
                ->addDecorator('Errors')
                ->addDecorator('Description', ['tag' => 'p', 'class' => 'description'])
                ->addDecorator('HtmlTag', [
                        'tag'   => 'dd',
                        'class' => 'event-products',
                        'id'    => ['callback' => [get_class($this), 'resolveElementId']]
                    ])
                ->addDecorator('Label', ['tag' => 'dt']);
        }
        return $this;
    }

    public function getEventId()
    {
        if (null == $this->_eventId) {
            throw new \Exception('Required property "' . __CLASS__ . '->_eventId" is missing');
        }
        return $this->_eventId;
    }

    public function setEventId($eventId)
    {
        $this->_eventId = $eventId;
        $this->_products = null;
        return $this;
    }

    public function isValid($value, $context = null)
    {
        if (parent::isValid($value, $context)) {
            $this->_validateProducts($this->getValue());
        }
        return !$this->hasErrors();
    }

    protected function _validateProducts($value)
    {
        $productIds = Qs_Array::fetchColAll((array) $this->getProducts(), 'id');
        foreach ((array) $value as $productId => $count) {
            if (!in_array($productId, $productIds)) {
                $this->addError('Unknown product ID "' . $productId . '"');
                continue;
            }
            if ($count < 0) {
                $this->addError('Quantity can\'t be less than zero "' . $count . '"');
            }
        }
        return $this;
    }

    public function getProducts()
    {
        if (null === $this->_products) {
            $this->_products = EventModel::readProducts($this->getEventId());
        }
        return $this->_products;
    }

}