/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package dmultierr

import (
	"fmt"
	"github.com/hashicorp/go-multierror"
	"strings"
)

// MultiErrorFormat provides a format for multierrors. This matches the default format, but if there
// is only one error we will not expand to multiple lines.
func MultiErrorFormat() multierror.ErrorFormatFunc {
	return func(errors []error) string {
		if len(errors) == 1 {
			return errors[0].Error()
		}
		points := make([]string, len(errors))
		for index, err := range errors {
			points[index] = fmt.Sprintf("* %s", err)
		}
		return fmt.Sprintf("%d errors occurred:\n\t%s\n",
			len(errors), strings.Join(points, "\n\t"))
	}
}

func New() *multierror.Error {
	return &multierror.Error{
		ErrorFormat: MultiErrorFormat(),
	}
}
