/*
Copyright 2021 The KodeRover Authors.

Licensed 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 kube

import (
	"regexp"
)

var invalidChars = regexp.MustCompile(`[^a-z0-9A-Z\-_.]`)

// a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end
// with an alphanumeric character (e.g. 'MyValue',  or 'my_value',  or '12345', regex used for validation is
// '(([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9])?')

func MakeSafeLabelValue(value string) string {
	return invalidChars.ReplaceAllString(value, "_")
}

func MergeLabels(from, to map[string]string) map[string]string {
	if to == nil {
		to = make(map[string]string)
	}

	for k, v := range from {
		to[k] = v
	}

	return to
}
