// Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
//
// 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 server

import (
	log "github.com/Sirupsen/logrus"
	"github.com/osrg/gobgp/packet"
	"os"
	"time"
)

type dumper struct {
	ch chan *broadcastBGPMsg
}

func (d *dumper) sendCh() chan *broadcastBGPMsg {
	return d.ch
}

func newDumper(filename string) (*dumper, error) {
	f, err := os.Create(filename)
	if err != nil {
		return nil, err
	}

	ch := make(chan *broadcastBGPMsg, 16)

	go func() {
		for {
			m := <-ch
			subtype := bgp.MESSAGE_AS4
			mp := bgp.NewBGP4MPMessage(m.peerAS, m.localAS, 0, m.peerAddress.String(), m.localAddress.String(), m.fourBytesAs, m.message)
			if m.fourBytesAs == false {
				subtype = bgp.MESSAGE
			}
			bm, err := bgp.NewMRTMessage(uint32(time.Now().Unix()), bgp.BGP4MP, subtype, mp)
			if err != nil {
				log.WithFields(log.Fields{
					"Topic": "mrt",
					"Data":  m,
				}).Warn(err)
				continue
			}
			buf, err := bm.Serialize()
			if err != nil {
				log.WithFields(log.Fields{
					"Topic": "mrt",
					"Data":  m,
				}).Warn(err)
			} else {
				f.Write(buf)
			}
		}
	}()
	return &dumper{
		ch: ch,
	}, nil
}