<?php

class Upgrade8 extends UpgradeNew
{
    // overi, jestli je opravnene provest upgrade
    public function checkRightfulness_1()
    {
        $change = true;

        $SQL = sqlQuery('SHOW FIELDS FROM '.getTableName('products_variations'));
        while ($row = sqlFetchArray($SQL)) {
            if ($row['Field'] == 'price') {
                $change = false;
                break;
            }
        }

        return $change;
    }

    // provest samotny upgrade
    public function makeChanges_1()
    {
        sqlQuery('ALTER TABLE '.getTableName('products_variations').' ADD price INT NULL AFTER delivery_time;');

        $this->upgradeOK();
    }

    // overi, jestli je opravnene provest upgrade
    public function checkRightfulness_2()
    {
        $change = false;

        $SQL = sqlQuery('SHOW FIELDS FROM '.getTableName('products_variations_choices_values'));
        while ($row = sqlFetchArray($SQL)) {
            if ($row['Field'] == 'id_product') {
                $change = true;
                break;
            }
        }

        return $change;
    }

    // provest samotny upgrade
    public function makeChanges_2()
    {
        sqlQuery('UPDATE '.getTableName('products_variations_combination').' pvc 
								JOIN '.getTableName('products_variations_choices_values').' pvcv2 ON pvc.id_value=pvcv2.id 
								SET pvc.id_value = (
									SELECT MIN(pvcv.id) 
									FROM '.getTableName('products_variations_choices_values').' pvcv 
									WHERE pvcv.value = pvcv2.value AND pvc.id_label = pvcv.id_label
								);', '@');

        sqlQuery('CREATE TEMPORARY TABLE tmp_variation AS SELECT MIN(id) AS id,id_label,value,code FROM '.getTableName('products_variations_choices_values').' pvcv GROUP BY value,id_label', '@');

        sqlQuery('DELETE pvcv FROM '.getTableName('products_variations_choices_values').' pvcv LEFT JOIN tmp_variation USING(id) WHERE tmp_variation.id IS NULL;', '@');

        sqlQuery('ALTER TABLE '.getTableName('products_variations_choices_values').' DROP FOREIGN KEY `products_variations_choices_values_ibfk_2`;', '@');

        sqlQuery('ALTER TABLE '.getTableName('products_variations_choices_values').' DROP id_product;', '@');

        sqlQuery('DROP TABLE tmp_variation;', '@');

        $this->upgradeOK();
    }
}