// Copyright (C) 2014, 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 zebra

import (
	"encoding/binary"
	"github.com/stretchr/testify/assert"
	"net"
	"testing"
)

func Test_Header(t *testing.T) {
	assert := assert.New(t)

	//DecodeFromBytes
	buf := make([]byte, 6)
	binary.BigEndian.PutUint16(buf[0:], 10)
	buf[2] = HEADER_MARKER
	buf[3] = VERSION
	binary.BigEndian.PutUint16(buf[4:], uint16(IPV4_ROUTE_ADD))
	h := &Header{}
	err := h.DecodeFromBytes(buf)
	assert.Equal(nil, err)

	//Serialize
	buf, err = h.Serialize()
	assert.Equal(nil, err)
	h2 := &Header{}
	err = h2.DecodeFromBytes(buf)
	assert.Equal(nil, err)
	assert.Equal(h, h2)

	// header_size mismatch
	buf = make([]byte, HEADER_SIZE-1)
	binary.BigEndian.PutUint16(buf[0:], 10)
	buf[2] = 0xff
	buf[3] = 0x02
	h3 := &Header{}
	err = h3.DecodeFromBytes(buf)
	assert.NotEqual(nil, err)
}

func Test_InterfaceUpdateBody(t *testing.T) {
	assert := assert.New(t)

	//DecodeFromBytes
	buf := make([]byte, INTERFACE_NAMSIZ+49)
	pos := INTERFACE_NAMSIZ
	binary.BigEndian.PutUint32(buf[pos:], 1)
	pos += 4
	buf[pos] = INTERFACE_ACTIVE
	pos += 1
	binary.BigEndian.PutUint64(buf[pos:], 1)
	pos += 8 // flags
	binary.BigEndian.PutUint32(buf[pos:], 1)
	pos += 4 // metric
	binary.BigEndian.PutUint32(buf[pos:], 1500)
	pos += 4 // MTU
	binary.BigEndian.PutUint32(buf[pos:], 1500)
	pos += 4 // MTU6
	binary.BigEndian.PutUint32(buf[pos:], 200)
	pos += 4 // bandwidth
	binary.BigEndian.PutUint32(buf[pos:], 6)
	pos += 4 // hwaddr_len
	mac, _ := net.ParseMAC("01:23:45:67:89:ab")
	copy(buf[pos:pos+6], []byte(mac))
	pos += 4
	b := &InterfaceUpdateBody{}
	err := b.DecodeFromBytes(buf)
	assert.Equal(nil, err)
	assert.Equal("01:23:45:67:89:ab", b.HardwareAddr.String())

	buf = make([]byte, INTERFACE_NAMSIZ+28)
	b = &InterfaceUpdateBody{}
	err = b.DecodeFromBytes(buf)
	assert.NotEqual(nil, err)
}

func Test_InterfaceAddressUpdateBody(t *testing.T) {
	assert := assert.New(t)

	//DecodeFromBytes
	buf := make([]byte, 11)
	pos := 0
	binary.BigEndian.PutUint32(buf[pos:], 0)
	pos += 4
	buf[pos] = 0x01
	pos += 1
	buf[pos] = 0x2
	pos += 1
	ip := net.ParseIP("192.168.100.1").To4()
	copy(buf[pos:pos+4], []byte(ip))
	pos += 4
	buf[pos] = byte(24)

	b := &InterfaceAddressUpdateBody{}
	err := b.DecodeFromBytes(buf)
	assert.Equal(uint32(0), b.Index)
	assert.Equal(uint8(1), b.Flags)
	assert.Equal("192.168.100.1", b.Prefix.String())
	assert.Equal(uint8(24), b.Length)

	// af invalid
	buf[5] = 0x4
	pos += 1
	b = &InterfaceAddressUpdateBody{}
	err = b.DecodeFromBytes(buf)
	assert.NotEqual(nil, err)
}

func Test_RouterIDUpdateBody(t *testing.T) {
	assert := assert.New(t)

	//DecodeFromBytes
	buf := make([]byte, 6)
	pos := 0
	buf[pos] = 0x2
	pos += 1
	ip := net.ParseIP("192.168.100.1").To4()
	copy(buf[pos:pos+4], []byte(ip))
	pos += 4
	buf[pos] = byte(32)

	b := &RouterIDUpdateBody{}
	err := b.DecodeFromBytes(buf)
	assert.Equal(nil, err)
	assert.Equal("192.168.100.1", b.Prefix.String())
	assert.Equal(uint8(32), b.Length)

	// af invalid
	buf[0] = 0x4
	pos += 1
	b = &RouterIDUpdateBody{}
	err = b.DecodeFromBytes(buf)
	assert.NotEqual(nil, err)
}

func Test_IPRouteBody_IPv4(t *testing.T) {
	assert := assert.New(t)

	//DecodeFromBytes IPV4_ROUTE
	buf := make([]byte, 22)
	buf[0] = byte(ROUTE_CONNECT)
	buf[1] = byte(FLAG_SELECTED)
	buf[2] = MESSAGE_NEXTHOP | MESSAGE_DISTANCE | MESSAGE_METRIC
	buf[3] = 24
	ip := net.ParseIP("192.168.100.0").To4()
	copy(buf[4:7], []byte(ip))

	buf[7] = 1
	nexthop := net.ParseIP("0.0.0.0").To4()
	copy(buf[8:12], []byte(nexthop))

	buf[12] = 1
	binary.BigEndian.PutUint32(buf[13:], 1)
	buf[17] = 0 // distance
	binary.BigEndian.PutUint32(buf[18:], 1)
	r := &IPRouteBody{Api: IPV4_ROUTE_ADD}
	err := r.DecodeFromBytes(buf)

	assert.Equal(nil, err)
	assert.Equal("192.168.100.0", r.Prefix.String())
	assert.Equal(uint8(0x18), r.PrefixLength)
	assert.Equal(uint8(MESSAGE_NEXTHOP|MESSAGE_DISTANCE|MESSAGE_METRIC), r.Message)
	assert.Equal("0.0.0.0", r.Nexthops[0].String())
	assert.Equal(uint32(1), r.Ifindexs[0])
	assert.Equal(uint8(0), r.Distance)
	assert.Equal(uint32(1), r.Metric)

	//Serialize
	buf, err = r.Serialize()
	assert.Equal(nil, err)
	assert.Equal([]byte{0x2, 0x10, 0xd}, buf[0:3])
	assert.Equal([]byte{0x0, 0x1}, buf[3:5])
	assert.Equal(byte(24), buf[5])
	ip = net.ParseIP("192.168.100.0").To4()
	assert.Equal([]byte(ip)[0:3], buf[6:9])
	assert.Equal(byte(NEXTHOP_IPV4), buf[10])
	assert.Equal(byte(NEXTHOP_IFINDEX), buf[15])
	assert.Equal(byte(0x0), buf[20])

	bi := make([]byte, 4)
	binary.BigEndian.PutUint32(bi, 1)
	assert.Equal(bi, buf[21:])

	// length invalid
	buf = make([]byte, 18)
	buf[0] = byte(ROUTE_CONNECT)
	buf[1] = byte(FLAG_SELECTED)
	buf[2] = MESSAGE_NEXTHOP | MESSAGE_DISTANCE | MESSAGE_METRIC
	buf[3] = 24
	ip = net.ParseIP("192.168.100.0").To4()
	copy(buf[4:7], []byte(ip))
	buf[7] = 1
	nexthop = net.ParseIP("0.0.0.0").To4()
	copy(buf[8:12], []byte(nexthop))
	buf[12] = 1
	binary.BigEndian.PutUint32(buf[13:], 1)

	r = &IPRouteBody{Api: IPV4_ROUTE_ADD}
	err = r.DecodeFromBytes(buf)
	assert.Equal("message length invalid", err.Error())

	// no nexthop
	buf = make([]byte, 12)
	buf[0] = byte(ROUTE_CONNECT)
	buf[1] = byte(FLAG_SELECTED)
	buf[2] = MESSAGE_DISTANCE | MESSAGE_METRIC
	buf[3] = 24
	ip = net.ParseIP("192.168.100.0").To4()
	copy(buf[4:7], []byte(ip))
	buf[7] = 1
	binary.BigEndian.PutUint32(buf[8:], 0)
	r = &IPRouteBody{Api: IPV6_ROUTE_ADD}
	err = r.DecodeFromBytes(buf)
	assert.Equal(nil, err)

}

func Test_IPRouteBody_IPv6(t *testing.T) {
	assert := assert.New(t)

	//DecodeFromBytes IPV6_ROUTE
	buf := make([]byte, 39)
	buf[0] = byte(ROUTE_CONNECT)
	buf[1] = byte(FLAG_SELECTED)
	buf[2] = MESSAGE_NEXTHOP | MESSAGE_DISTANCE | MESSAGE_METRIC
	buf[3] = 64
	ip := net.ParseIP("2001:db8:0:f101::").To16()
	copy(buf[4:12], []byte(ip))

	buf[12] = 1
	nexthop := net.ParseIP("::").To16()
	copy(buf[13:29], []byte(nexthop))
	// ifindex
	buf[29] = 1
	binary.BigEndian.PutUint32(buf[30:], 1)

	buf[34] = 0 // distance
	binary.BigEndian.PutUint32(buf[35:], 1)
	r := &IPRouteBody{Api: IPV6_ROUTE_ADD}
	err := r.DecodeFromBytes(buf)

	assert.Equal(nil, err)
	assert.Equal("2001:db8:0:f101::", r.Prefix.String())
	assert.Equal(uint8(64), r.PrefixLength)
	assert.Equal(uint8(MESSAGE_NEXTHOP|MESSAGE_DISTANCE|MESSAGE_METRIC), r.Message)
	assert.Equal("::", r.Nexthops[0].String())
	assert.Equal(uint32(1), r.Ifindexs[0])
	assert.Equal(uint8(0), r.Distance)
	assert.Equal(uint32(1), r.Metric)

	//Serialize
	buf, err = r.Serialize()
	assert.Equal(nil, err)
	assert.Equal([]byte{0x2, 0x10, 0xd}, buf[0:3])
	assert.Equal([]byte{0x0, 0x1}, buf[3:5])
	assert.Equal(byte(64), buf[5])
	ip = net.ParseIP("2001:db8:0:f101::").To16()
	assert.Equal([]byte(ip)[0:8], buf[6:14])
	assert.Equal(byte(2), buf[14])
	assert.Equal(byte(NEXTHOP_IPV6), buf[15])
	ip = net.ParseIP("::").To16()
	assert.Equal([]byte(ip), buf[16:32])
	assert.Equal(byte(NEXTHOP_IFINDEX), buf[32])
	bi := make([]byte, 4)
	binary.BigEndian.PutUint32(bi, 1)
	assert.Equal(bi, buf[33:37])

	//distance
	assert.Equal(byte(0), buf[37])
	bi = make([]byte, 4)
	binary.BigEndian.PutUint32(bi, 1)
	assert.Equal(bi, buf[38:])

	// length invalid
	buf = make([]byte, 50)
	buf[0] = byte(ROUTE_CONNECT)
	buf[1] = byte(FLAG_SELECTED)
	buf[2] = MESSAGE_NEXTHOP | MESSAGE_DISTANCE | MESSAGE_METRIC
	buf[3] = 24
	ip = net.ParseIP("2001:db8:0:f101::").To4()
	copy(buf[4:12], []byte(ip))
	buf[13] = 1
	nexthop = net.ParseIP("::").To16()
	copy(buf[14:30], []byte(nexthop))
	buf[31] = 1
	binary.BigEndian.PutUint32(buf[32:], 1)

	r = &IPRouteBody{Api: IPV6_ROUTE_ADD}
	err = r.DecodeFromBytes(buf)
	assert.Equal("message length invalid", err.Error())

	// no nexthop
	buf = make([]byte, 11)
	buf[0] = byte(ROUTE_CONNECT)
	buf[1] = byte(FLAG_SELECTED)
	buf[2] = MESSAGE_DISTANCE | MESSAGE_METRIC
	buf[3] = 16
	ip = net.ParseIP("2501::").To16()
	copy(buf[4:6], []byte(ip))
	buf[6] = 1
	binary.BigEndian.PutUint32(buf[7:], 0)
	r = &IPRouteBody{Api: IPV6_ROUTE_ADD}
	err = r.DecodeFromBytes(buf)
	assert.Equal(nil, err)
}