<?php
namespace Shopkeeper\VendorNotes\Model\Config\Backend;

use Magento\Config\Model\Config\Backend\Serialized\ArraySerialized;

class HtmlArraySerialized extends ArraySerialized
{
    /**
     * Process data before saving
     * Prevent HTML from being escaped in note fields
     *
     * @return $this
     */
    public function beforeSave()
    {
        $value = $this->getValue();
        
        if (is_array($value)) {
            // Don't escape HTML in the note field
            foreach ($value as &$row) {
                if (isset($row['note'])) {
                    // Decode any previously encoded HTML entities
                    $row['note'] = html_entity_decode($row['note'], ENT_QUOTES, 'UTF-8');
                }
            }
            unset($row);
        }
        
        $this->setValue($value);
        return parent::beforeSave();
    }
}