// Copyright © 2019 Banzai Cloud
//
// 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 network

import (
	"net"

	"emperror.dev/errors"
)

func Contains(cidr string, ip net.IP) (bool, error) {
	_, c, err := net.ParseCIDR(cidr)
	if err != nil {
		return false, err
	}

	return c.Contains(ip), nil
}

func ContainsFirst(cidr string, ips []net.IP) (net.IP, error) {
	for _, ip := range ips {
		if ok, err := Contains(cidr, ip); err == nil && ok {
			return ip, nil
		}
	}

	return nil, errors.Errorf("cidr %q does not contain ip %q", cidr, ips)
}
