<?php

namespace FME\PopupWindowMessage\Setup;
use Magento\Framework\Setup\UpgradeSchemaInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\SchemaSetupInterface;
use Magento\Framework\DB\Ddl\Table;

class UpgradeSchema implements UpgradeSchemaInterface
{
    public function upgrade(SchemaSetupInterface $setup, ModuleContextInterface $context)
    {
        $installer = $setup;
        $installer->startSetup();
        if (version_compare($context->getVersion(), '1.0.9') < 0) {
            $tableName = $setup->getTable('fme_pwm_master');
            // Check if the table already exists
            if ($installer->TableExists($tableName)) {
                $setup->getConnection()->addColumn(
                    $installer->getTable('fme_pwm_master'),
                    'priority',
                    [
                        'type' => \Magento\Framework\DB\Ddl\Table::TYPE_TEXT,
                        'nullable' => false,
                        'comment' => 'priority',
                    ]
                );
            }
        }
        $installer->endSetup();
    }
}