func TestOldUnoM(t *testing.T) {
	popr := math_rand.New(math_rand.NewSource(time.Now().UnixNano()))
	older := NewPopulatedOldUnoM(popr, true)
	// need optional field to be always initialized, to check it's lost in this test
	older.Field1 = proto.String(randStringUnrecognized(popr))
	data1, err := proto.Marshal(older)
	if err != nil {
		panic(err)
	}

	newer := &UnoM{}
	if err := proto.Unmarshal(data1, newer); err != nil {
		panic(err)
	}
	data2, err := proto.Marshal(newer)
	if err != nil {
		panic(err)
	}

	older2 := &OldUnoM{}
	if err := proto.Unmarshal(data2, older2); err != nil {
		panic(err)
	}

	// check that Field1 is lost
	if older2.Field1 != nil {
		t.Fatalf("field must be lost, but it's not, older: %#v, older2: %#v", older, older2)
	}

	// now restore Field1 and messages should be equal now
	older2.Field1 = older.Field1
	if err := older.VerboseEqual(older2); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", older, older2, err)
	}
}

func (this *fullReader) ReadMsg(msg proto.Message) error {
	length, err := this.r.Read(this.buf)
	if err != nil {
		return err
	}
	return proto.Unmarshal(this.buf[:length], msg)
}

func Generate(req *plugin.CodeGeneratorRequest) *plugin.CodeGeneratorResponse {
	// Begin by allocating a generator. The request and response structures are stored there
	// so we can do error handling easily - the response structure contains the field to
	// report failure.
	g := generator.New()
	g.Request = req

	g.CommandLineParameters(g.Request.GetParameter())

	// Create a wrapped version of the Descriptors and EnumDescriptors that
	// point to the file that defines them.
	g.WrapTypes()

	g.SetPackageNames()
	g.BuildTypeNameMap()

	g.GenerateAllFiles()

	gtest := generator.New()

	data, err := proto.Marshal(req)
	if err != nil {
		g.Error(err, "failed to marshal modified proto")
	}
	if err := proto.Unmarshal(data, gtest.Request); err != nil {
		g.Error(err, "parsing modified proto")
	}

	if len(gtest.Request.FileToGenerate) == 0 {
		gtest.Fail("no files to generate")
	}

	gtest.CommandLineParameters(gtest.Request.GetParameter())

	// Create a wrapped version of the Descriptors and EnumDescriptors that
	// point to the file that defines them.
	gtest.WrapTypes()

	gtest.SetPackageNames()
	gtest.BuildTypeNameMap()

	gtest.GeneratePlugin(testgen.NewPlugin())

	for i := 0; i < len(gtest.Response.File); i++ {
		if strings.Contains(*gtest.Response.File[i].Content, `//These tests are generated by github.com/gogo/protobuf/plugin/testgen`) {
			gtest.Response.File[i].Name = proto.String(strings.Replace(*gtest.Response.File[i].Name, ".pb.go", "pb_test.go", -1))
			g.Response.File = append(g.Response.File, gtest.Response.File[i])
		}
	}

	for i := 0; i < len(g.Response.File); i++ {
		formatted, err := format.Source([]byte(g.Response.File[i].GetContent()))
		if err != nil {
			g.Error(err, "go format error")
		}
		fmts := string(formatted)
		g.Response.File[i].Content = &fmts
	}
	return g.Response
}

//See another version of this test in proto/extensions_test.go
func TestGetExtensionStability(t *testing.T) {
	check := func(m *NoExtensionsMap) bool {
		ext1, err := proto.GetExtension(m, E_FieldB1)
		if err != nil {
			t.Fatalf("GetExtension() failed: %s", err)
		}
		ext2, err := proto.GetExtension(m, E_FieldB1)
		if err != nil {
			t.Fatalf("GetExtension() failed: %s", err)
		}
		return ext1.(*NinOptNative).Equal(ext2)
	}
	msg := &NoExtensionsMap{Field1: proto.Int64(2)}
	ext0 := &NinOptNative{Field1: proto.Float64(1)}
	if err := proto.SetExtension(msg, E_FieldB1, ext0); err != nil {
		t.Fatalf("Could not set ext1: %s", ext0)
	}
	if !check(msg) {
		t.Errorf("GetExtension() not stable before marshaling")
	}
	bb, err := proto.Marshal(msg)
	if err != nil {
		t.Fatalf("Marshal() failed: %s", err)
	}
	msg1 := &NoExtensionsMap{}
	err = proto.Unmarshal(bb, msg1)
	if err != nil {
		t.Fatalf("Unmarshal() failed: %s", err)
	}
	if !check(msg1) {
		t.Errorf("GetExtension() not stable after unmarshaling")
	}
}

func TestUnmarshalPartiallyPopulatedOptionalFieldsFails(t *testing.T) {
	// Fill in all fields, then randomly remove one.
	dataOut := &test.NinOptNative{
		Field1:  proto.Float64(0),
		Field2:  proto.Float32(0),
		Field3:  proto.Int32(0),
		Field4:  proto.Int64(0),
		Field5:  proto.Uint32(0),
		Field6:  proto.Uint64(0),
		Field7:  proto.Int32(0),
		Field8:  proto.Int64(0),
		Field9:  proto.Uint32(0),
		Field10: proto.Int32(0),
		Field11: proto.Uint64(0),
		Field12: proto.Int64(0),
		Field13: proto.Bool(false),
		Field14: proto.String("0"),
		Field15: []byte("0"),
	}
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	fieldName := "Field" + strconv.Itoa(r.Intn(15)+1)
	field := reflect.ValueOf(dataOut).Elem().FieldByName(fieldName)
	fieldType := field.Type()
	field.Set(reflect.Zero(fieldType))
	encodedMessage, err := proto.Marshal(dataOut)
	if err != nil {
		t.Fatalf("Unexpected error when marshalling dataOut: %v", err)
	}
	dataIn := NidOptNative{}
	err = proto.Unmarshal(encodedMessage, &dataIn)
	if err.Error() != `proto: required field "`+fieldName+`" not set` {
		t.Fatalf(`err.Error() != "proto: required field "`+fieldName+`" not set"; was "%s" instead`, err.Error())
	}
}

func TestRoundTripProto3(t *testing.T) {
	m := &pb.Message{
		Name:         "David",          // (2 | 1<<3): 0x0a 0x05 "David"
		Hilarity:     pb.Message_PUNS,  // (0 | 2<<3): 0x10 0x01
		HeightInCm:   178,              // (0 | 3<<3): 0x18 0xb2 0x01
		Data:         []byte("roboto"), // (2 | 4<<3): 0x20 0x06 "roboto"
		ResultCount:  47,               // (0 | 7<<3): 0x38 0x2f
		TrueScotsman: true,             // (0 | 8<<3): 0x40 0x01
		Score:        8.1,              // (5 | 9<<3): 0x4d <8.1>

		Key: []uint64{1, 0xdeadbeef},
		Nested: &pb.Nested{
			Bunny: "Monty",
		},
	}
	t.Logf(" m: %v", m)

	b, err := proto.Marshal(m)
	if err != nil {
		t.Fatalf("proto.Marshal: %v", err)
	}
	t.Logf(" b: %q", b)

	m2 := new(pb.Message)
	if err := proto.Unmarshal(b, m2); err != nil {
		t.Fatalf("proto.Unmarshal: %v", err)
	}
	t.Logf("m2: %v", m2)

	if !proto.Equal(m, m2) {
		t.Errorf("proto.Equal returned false:\n m: %v\nm2: %v", m, m2)
	}
}

func TestZeroLengthOptionalBytes(t *testing.T) {
	roundtrip := func(f *Foo) *Foo {
		data, err := proto.Marshal(f)
		if err != nil {
			panic(err)
		}
		newF := &Foo{}
		err = proto.Unmarshal(data, newF)
		if err != nil {
			panic(err)
		}
		return newF
	}

	f := &Foo{}
	roundtrippedF := roundtrip(f)
	if roundtrippedF.Bar != nil {
		t.Fatalf("should be nil")
	}

	f.Bar = []byte{}
	roundtrippedF = roundtrip(f)
	if roundtrippedF.Bar == nil {
		t.Fatalf("should not be nil")
	}
	if len(roundtrippedF.Bar) != 0 {
		t.Fatalf("should be empty")
	}
}

func TestCastawayMarshalTo(t *testing.T) {
	popr := math_rand.New(math_rand.NewSource(time.Now().UnixNano()))
	p := NewPopulatedCastaway(popr, false)
	size := p.Size()
	data := make([]byte, size)
	for i := range data {
		data[i] = byte(popr.Intn(256))
	}
	_, err := p.MarshalTo(data)
	if err != nil {
		panic(err)
	}
	msg := &Castaway{}
	if err := github_com_gogo_protobuf_proto.Unmarshal(data, msg); err != nil {
		panic(err)
	}
	for i := range data {
		data[i] = byte(popr.Intn(256))
	}
	if err := p.VerboseEqual(msg); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", msg, p, err)
	}
	if !p.Equal(msg) {
		t.Fatalf("%#v !Proto %#v", msg, p)
	}
}

func TestGetExtensionStability(t *testing.T) {
	check := func(m *pb.MyMessage) bool {
		ext1, err := proto.GetExtension(m, pb.E_Ext_More)
		if err != nil {
			t.Fatalf("GetExtension() failed: %s", err)
		}
		ext2, err := proto.GetExtension(m, pb.E_Ext_More)
		if err != nil {
			t.Fatalf("GetExtension() failed: %s", err)
		}
		return ext1 == ext2
	}
	msg := &pb.MyMessage{Count: proto.Int32(4)}
	ext0 := &pb.Ext{}
	if err := proto.SetExtension(msg, pb.E_Ext_More, ext0); err != nil {
		t.Fatalf("Could not set ext1: %s", ext0)
	}
	if !check(msg) {
		t.Errorf("GetExtension() not stable before marshaling")
	}
	bb, err := proto.Marshal(msg)
	if err != nil {
		t.Fatalf("Marshal() failed: %s", err)
	}
	msg1 := &pb.MyMessage{}
	err = proto.Unmarshal(bb, msg1)
	if err != nil {
		t.Fatalf("Unmarshal() failed: %s", err)
	}
	if !check(msg1) {
		t.Errorf("GetExtension() not stable after unmarshaling")
	}
}

func TestOldNewOldNew(t *testing.T) {
	popr := math_rand.New(math_rand.NewSource(time.Now().UnixNano()))
	older := NewPopulatedOldWithGroup(popr, true)
	data1, err := proto.Marshal(older)
	if err != nil {
		panic(err)
	}
	newer := &NewNoGroup{}
	if err := proto.Unmarshal(data1, newer); err != nil {
		panic(err)
	}
	data2, err := proto.Marshal(newer)
	if err != nil {
		panic(err)
	}
	bluer := &OldWithGroup{}
	if err := proto.Unmarshal(data2, bluer); err != nil {
		panic(err)
	}
	if err := older.VerboseEqual(bluer); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", older, bluer, err)
	}

	data3, err := proto.Marshal(bluer)
	if err != nil {
		panic(err)
	}
	purple := &NewNoGroup{}
	if err := proto.Unmarshal(data3, purple); err != nil {
		panic(err)
	}
	data4, err := proto.Marshal(purple)
	if err != nil {
		panic(err)
	}
	magenta := &OldWithGroup{}
	if err := proto.Unmarshal(data4, magenta); err != nil {
		panic(err)
	}
	if err := older.VerboseEqual(magenta); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", older, magenta, err)
	}
}

func TestUnmarshalErrorsWhenRequiredFieldIsNotPresent(t *testing.T) {
	missingRequiredField := []byte{0x12, 0x8, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c}
	data := RequiredExample{}
	err := proto.Unmarshal(missingRequiredField, &data)
	if err == nil {
		t.Fatalf("err == nil; was %v instead", err)
	}
	if err.Error() != `proto: required field "theRequiredString" not set` {
		t.Fatalf(`err.Error() != "proto: required field "theRequiredString" not set"; was "%s" instead`, err.Error())
	}
}

func TestUnmarshalPopulatedOptionalFieldsAsRequiredSucceeds(t *testing.T) {
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	dataOut := test.NewPopulatedNidOptNative(r, true)
	encodedMessage, err := proto.Marshal(dataOut)
	if err != nil {
		t.Fatalf("Unexpected error when marshalling dataOut: %v", err)
	}
	dataIn := NidOptNative{}
	err = proto.Unmarshal(encodedMessage, &dataIn)
	if err != nil {
		t.Fatalf("err != nil; was %v instead", err)
	}
}

func TestUnmarshalSucceedsWhenRequiredIsNotPresent(t *testing.T) {
	dataOut := RequiredExample{
		TheRequiredString: proto.String("present"),
	}
	encodedMessage, err := proto.Marshal(&dataOut)
	if err != nil {
		t.Fatalf("Unexpected error when marshalling dataOut: %v", err)
	}
	dataIn := RequiredExample{}
	err = proto.Unmarshal(encodedMessage, &dataIn)
	if err != nil {
		t.Fatalf("err != nil; was %v instead", err)
	}
}

func TestNewOld(t *testing.T) {
	popr := math_rand.New(math_rand.NewSource(time.Now().UnixNano()))
	newer := NewPopulatedNewNoGroup(popr, true)
	data1, err := proto.Marshal(newer)
	if err != nil {
		panic(err)
	}
	older := &OldWithGroup{}
	if err := proto.Unmarshal(data1, older); err != nil {
		panic(err)
	}
	data2, err := proto.Marshal(older)
	if err != nil {
		panic(err)
	}
	bluer := &NewNoGroup{}
	if err := proto.Unmarshal(data2, bluer); err != nil {
		panic(err)
	}
	if err := newer.VerboseEqual(bluer); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", newer, bluer, err)
	}
}

func BenchmarkUnmarshalNinOptStructWhole(b *testing.B) {
	r := math_rand.New(math_rand.NewSource(time.Now().UnixNano()))
	for i := 0; i < b.N; i++ {
		b.StopTimer()
		p := test.NewPopulatedNinOptStruct(r, false)
		data, err := proto.Marshal(p)
		if err != nil {
			panic(err)
		}
		b.StartTimer()
		pp := &test.NinOptStruct{}
		proto.Unmarshal(data, pp)
	}
}

func TestCastawayVerboseEqual(t *testing.T) {
	popr := math_rand.New(math_rand.NewSource(time.Now().UnixNano()))
	p := NewPopulatedCastaway(popr, false)
	data, err := github_com_gogo_protobuf_proto.Marshal(p)
	if err != nil {
		panic(err)
	}
	msg := &Castaway{}
	if err := github_com_gogo_protobuf_proto.Unmarshal(data, msg); err != nil {
		panic(err)
	}
	if err := p.VerboseEqual(msg); err != nil {
		t.Fatalf("%#v !VerboseEqual %#v, since %v", msg, p, err)
	}
}

func TestRepeatedOptional(t *testing.T) {
	repeated := &FooWithRepeated{Bar: [][]byte{[]byte("a"), []byte("b")}}
	data, err := proto.Marshal(repeated)
	if err != nil {
		panic(err)
	}
	optional := &Foo{}
	err = proto.Unmarshal(data, optional)
	if err != nil {
		panic(err)
	}

	if !bytes.Equal(optional.Bar, []byte("b")) {
		t.Fatalf("should return the last entry")
	}
}

func TestBugUuid(t *testing.T) {
	u := &CustomContainer{CustomStruct: NidOptCustom{Id: Uuid{}}}
	data, err := proto.Marshal(u)
	if err != nil {
		panic(err)
	}
	u2 := &CustomContainer{}
	err = proto.Unmarshal(data, u2)
	if err != nil {
		panic(err)
	}
	t.Logf("%+v", u2)
	if u2.CustomStruct.Id != nil {
		t.Fatalf("should be nil")
	}
}

func Read() *plugin.CodeGeneratorRequest {
	g := generator.New()
	data, err := ioutil.ReadAll(os.Stdin)
	if err != nil {
		g.Error(err, "reading input")
	}

	if err := proto.Unmarshal(data, g.Request); err != nil {
		g.Error(err, "parsing input proto")
	}

	if len(g.Request.FileToGenerate) == 0 {
		g.Fail("no files to generate")
	}
	return g.Request
}

func (this *varintReader) ReadMsg(msg proto.Message) error {
	length64, err := binary.ReadUvarint(this.r)
	if err != nil {
		return err
	}
	length := int(length64)
	if length < 0 || length > this.maxSize {
		return io.ErrShortBuffer
	}
	if len(this.buf) < length {
		this.buf = make([]byte, length)
	}
	buf := this.buf[:length]
	if _, err := io.ReadFull(this.r, buf); err != nil {
		return err
	}
	return proto.Unmarshal(buf, msg)
}