class ComboGroup
{
    /**
     * Creates a new combo group for a Welcart item and returns it
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $args
     * @param array $payload
     * @return GenericError|ComboGroupType
     */
    public function create(array $args, array $payload) {
        $comboSetId = (int)$args['comboSetId'];
        $label = !empty($payload['label']) ? (string)$payload['label'] : '';
        $optional = !empty($payload['optional']) ? (bool)$payload['optional'] : false;
        $enableMultiSelect = !empty($payload['enableMultiSelect']) ? (bool)$payload['enableMultiSelect'] : false;
        return API\ComboGroup::createComboGroup($comboSetId, $label, $optional, $enableMultiSelect);
    }

    /**
     * Gets a combo group by id or returns all groups
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $args
     * @param array $payload
     * @return GenericError|ComboGroupType|ComboGroupType[]
     */
    public function get(array $args, array $payload) {
        $comboSetId = (int)$args['comboSetId'];
        $id = !empty($payload['groupId']) ? (int)$payload['groupId'] : null;
        if (!empty($id)) {
            return API\ComboGroup::getComboGroupById($id);
        }

        return API\ComboGroup::getAllComboGroupsByComboSetId($comboSetId);
    }

    /**
     * Updates a combo group and returns it
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $args
     * @param array $payload
     * @return GenericError|ComboGroupType
     */
    public function update(array $args, array $payload) {
        $groupId = (int)$args['groupId'];
        $label = !empty($payload['label']) ? (string)$payload['label'] : '';
        $optional = !empty($payload['optional']) ? (bool)$payload['optional'] : false;
        $enableMultiSelect = !empty($payload['enableMultiSelect']) ? (bool)$payload['enableMultiSelect'] : false;
        return API\ComboGroup::updateComboGroup($groupId, $label, $optional, $enableMultiSelect);
    }

    /**
     * Deletes a combo group
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $args
     * @return GenericError|string `success` on success
     */
    public function delete(array $args) {
        $groupId = (int)$args['groupId'];
        $res = API\ComboGroup::deleteComboGroup($groupId);
        if ($res instanceof GenericError) {
            return $res;
        }

        return 'success';
    }

    /**
     * Duplicates a combo group
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $args
     * @param array $payload
     * @return GenericError|ComboGroupType
     */
    public function duplicate(array $args, array $payload) {
        $groupId = (int)$args['groupId'];
        $label = !empty($payload['label']) ? (string)$payload['label'] : '';

        return API\ComboGroup::duplicateComboGroup($groupId, $label);
    }

    /**
     * Re-orders all groups in a combo item
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @param array $args
     * @param array $payload
     * @return GenericError|ComboGroupType[]
     */
    public function reorder(array $args, array $payload) {
        $comboSetId = (int)$args['comboSetId'];
        $groupIds = (array)$payload['groupIds'];
        $res = API\ComboGroup::reorderComboGroups($comboSetId, $groupIds);
        if ($res instanceof GenericError) {
            return $res;
        }

        return API\ComboGroup::getAllComboGroupsByComboSetId($comboSetId);
    }
}