<?php
class AttributeGroup extends AttributeGroupCore 
{
    /**
     * @Override
     * On vient directement recup que les attributeCombinaisons avec l'id_attribute = 0
     */
    public static function cleanDeadCombinations()
    {
        $attributeCombinations = Db::getInstance()->ExecuteS('
            SELECT pac.`id_attribute`, pa.`id_product_attribute` 
            FROM `'._DB_PREFIX_.'product_attribute` pa LEFT JOIN `'._DB_PREFIX_.'product_attribute_combination` pac ON (pa.`id_product_attribute` = pac.`id_product_attribute`)
            WHERE pac.`id_attribute`=0
        ');
        $toRemove = array();
        foreach ($attributeCombinations AS $attributeCombination)
            if ((int)($attributeCombination['id_attribute']) == 0)
                $toRemove[] = (int)($attributeCombination['id_product_attribute']);
        if (!empty($toRemove) AND Db::getInstance()->Execute('DELETE FROM `'._DB_PREFIX_.'product_attribute` WHERE `id_product_attribute` IN ('.implode(', ', $toRemove).')') === false)
            return false;
        return true;
    }

    public function delete()
    {
        /* Select children in order to find linked combinations */
        $attributeIds = Db::getInstance()->ExecuteS('SELECT `id_attribute` FROM `'._DB_PREFIX_.'attribute` WHERE `id_attribute_group` = '.(int)($this->id));
        if ($attributeIds === false)
            return false;
        /* Removing attributes to the found combinations */
        $toRemove = array();
        foreach ($attributeIds AS $attribute)
            $toRemove[] = (int)($attribute['id_attribute']);
        if (!empty($toRemove) AND Db::getInstance()->Execute('DELETE FROM `'._DB_PREFIX_.'product_attribute_combination` WHERE `id_attribute` IN ('.implode(', ', $toRemove).')') === false)
            return false;
        /* Remove combinations if they do not possess attributes anymore */
        if (!self::cleanDeadCombinations())
            return false;
        /* Also delete related attributes */
        if (Db::getInstance()->Execute('DELETE FROM `'._DB_PREFIX_.'attribute_lang` WHERE `id_attribute` IN (SELECT id_attribute FROM `'._DB_PREFIX_.'attribute` WHERE `id_attribute_group` = '.(int)($this->id).')') === false OR Db::getInstance()->Execute('DELETE FROM `'._DB_PREFIX_.'attribute` WHERE `id_attribute_group` = '.(int)($this->id)) === false)
            return false;
        $return = parent::delete();
        if($return)
            Module::hookExec('afterDeleteAttributeGroup', array('id_attribute_group' => $this->id));
        return $return;
    }
}