/*
   Copyright 2014 CoreOS, Inc.

   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 flags

import (
	"errors"
	"fmt"
	"net"
	"strconv"
	"strings"
)

// IPAddressPort implements the flag.Value interface. The argument
// is validated as "ip:port".
type IPAddressPort struct {
	IP   string
	Port int
}

func (a *IPAddressPort) Set(arg string) error {
	arg = strings.TrimSpace(arg)

	parts := strings.SplitN(arg, ":", 2)
	if len(parts) != 2 {
		return errors.New("bad format in address specification")
	}

	if net.ParseIP(parts[0]) == nil {
		return errors.New("bad IP in address specification")
	}

	port, err := strconv.Atoi(parts[1])
	if err != nil {
		return errors.New("bad port in address specification")
	}

	a.IP = parts[0]
	a.Port = port

	return nil
}

func (a *IPAddressPort) String() string {
	return fmt.Sprintf("%s:%d", a.IP, a.Port)
}