// Go support for Protocol Buffers - Google's data interchange format
//
// Copyright 2014 The Go Authors.  All rights reserved.
// https://github.com/golang/protobuf
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package proto_test

import (
	"fmt"
	"reflect"
	"testing"

	"github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/golang/protobuf/proto"
	pb "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/golang/protobuf/proto/testdata"
)

func TestGetExtensionsWithMissingExtensions(t *testing.T) {
	msg := &pb.MyMessage{}
	ext1 := &pb.Ext{}
	if err := proto.SetExtension(msg, pb.E_Ext_More, ext1); err != nil {
		t.Fatalf("Could not set ext1: %s", ext1)
	}
	exts, err := proto.GetExtensions(msg, []*proto.ExtensionDesc{
		pb.E_Ext_More,
		pb.E_Ext_Text,
	})
	if err != nil {
		t.Fatalf("GetExtensions() failed: %s", err)
	}
	if exts[0] != ext1 {
		t.Errorf("ext1 not in returned extensions: %T %v", exts[0], exts[0])
	}
	if exts[1] != nil {
		t.Errorf("ext2 in returned extensions: %T %v", exts[1], exts[1])
	}
}

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 TestGetExtensionDefaults(t *testing.T) {
	var setFloat64 float64 = 1
	var setFloat32 float32 = 2
	var setInt32 int32 = 3
	var setInt64 int64 = 4
	var setUint32 uint32 = 5
	var setUint64 uint64 = 6
	var setBool = true
	var setBool2 = false
	var setString = "Goodnight string"
	var setBytes = []byte("Goodnight bytes")
	var setEnum = pb.DefaultsMessage_TWO

	type testcase struct {
		ext  *proto.ExtensionDesc // Extension we are testing.
		want interface{}          // Expected value of extension, or nil (meaning that GetExtension will fail).
		def  interface{}          // Expected value of extension after ClearExtension().
	}
	tests := []testcase{
		{pb.E_NoDefaultDouble, setFloat64, nil},
		{pb.E_NoDefaultFloat, setFloat32, nil},
		{pb.E_NoDefaultInt32, setInt32, nil},
		{pb.E_NoDefaultInt64, setInt64, nil},
		{pb.E_NoDefaultUint32, setUint32, nil},
		{pb.E_NoDefaultUint64, setUint64, nil},
		{pb.E_NoDefaultSint32, setInt32, nil},
		{pb.E_NoDefaultSint64, setInt64, nil},
		{pb.E_NoDefaultFixed32, setUint32, nil},
		{pb.E_NoDefaultFixed64, setUint64, nil},
		{pb.E_NoDefaultSfixed32, setInt32, nil},
		{pb.E_NoDefaultSfixed64, setInt64, nil},
		{pb.E_NoDefaultBool, setBool, nil},
		{pb.E_NoDefaultBool, setBool2, nil},
		{pb.E_NoDefaultString, setString, nil},
		{pb.E_NoDefaultBytes, setBytes, nil},
		{pb.E_NoDefaultEnum, setEnum, nil},
		{pb.E_DefaultDouble, setFloat64, float64(3.1415)},
		{pb.E_DefaultFloat, setFloat32, float32(3.14)},
		{pb.E_DefaultInt32, setInt32, int32(42)},
		{pb.E_DefaultInt64, setInt64, int64(43)},
		{pb.E_DefaultUint32, setUint32, uint32(44)},
		{pb.E_DefaultUint64, setUint64, uint64(45)},
		{pb.E_DefaultSint32, setInt32, int32(46)},
		{pb.E_DefaultSint64, setInt64, int64(47)},
		{pb.E_DefaultFixed32, setUint32, uint32(48)},
		{pb.E_DefaultFixed64, setUint64, uint64(49)},
		{pb.E_DefaultSfixed32, setInt32, int32(50)},
		{pb.E_DefaultSfixed64, setInt64, int64(51)},
		{pb.E_DefaultBool, setBool, true},
		{pb.E_DefaultBool, setBool2, true},
		{pb.E_DefaultString, setString, "Hello, string"},
		{pb.E_DefaultBytes, setBytes, []byte("Hello, bytes")},
		{pb.E_DefaultEnum, setEnum, pb.DefaultsMessage_ONE},
	}

	checkVal := func(test testcase, msg *pb.DefaultsMessage, valWant interface{}) error {
		val, err := proto.GetExtension(msg, test.ext)
		if err != nil {
			if valWant != nil {
				return fmt.Errorf("GetExtension(): %s", err)
			}
			if want := proto.ErrMissingExtension; err != want {
				return fmt.Errorf("Unexpected error: got %v, want %v", err, want)
			}
			return nil
		}

		// All proto2 extension values are either a pointer to a value or a slice of values.
		ty := reflect.TypeOf(val)
		tyWant := reflect.TypeOf(test.ext.ExtensionType)
		if got, want := ty, tyWant; got != want {
			return fmt.Errorf("unexpected reflect.TypeOf(): got %v want %v", got, want)
		}
		tye := ty.Elem()
		tyeWant := tyWant.Elem()
		if got, want := tye, tyeWant; got != want {
			return fmt.Errorf("unexpected reflect.TypeOf().Elem(): got %v want %v", got, want)
		}

		// Check the name of the type of the value.
		// If it is an enum it will be type int32 with the name of the enum.
		if got, want := tye.Name(), tye.Name(); got != want {
			return fmt.Errorf("unexpected reflect.TypeOf().Elem().Name(): got %v want %v", got, want)
		}

		// Check that value is what we expect.
		// If we have a pointer in val, get the value it points to.
		valExp := val
		if ty.Kind() == reflect.Ptr {
			valExp = reflect.ValueOf(val).Elem().Interface()
		}
		if got, want := valExp, valWant; !reflect.DeepEqual(got, want) {
			return fmt.Errorf("unexpected reflect.DeepEqual(): got %v want %v", got, want)
		}

		return nil
	}

	setTo := func(test testcase) interface{} {
		setTo := reflect.ValueOf(test.want)
		if typ := reflect.TypeOf(test.ext.ExtensionType); typ.Kind() == reflect.Ptr {
			setTo = reflect.New(typ).Elem()
			setTo.Set(reflect.New(setTo.Type().Elem()))
			setTo.Elem().Set(reflect.ValueOf(test.want))
		}
		return setTo.Interface()
	}

	for _, test := range tests {
		msg := &pb.DefaultsMessage{}
		name := test.ext.Name

		// Check the initial value.
		if err := checkVal(test, msg, test.def); err != nil {
			t.Errorf("%s: %v", name, err)
		}

		// Set the per-type value and check value.
		name = fmt.Sprintf("%s (set to %T %v)", name, test.want, test.want)
		if err := proto.SetExtension(msg, test.ext, setTo(test)); err != nil {
			t.Errorf("%s: SetExtension(): %v", name, err)
			continue
		}
		if err := checkVal(test, msg, test.want); err != nil {
			t.Errorf("%s: %v", name, err)
			continue
		}

		// Set and check the value.
		name += " (cleared)"
		proto.ClearExtension(msg, test.ext)
		if err := checkVal(test, msg, test.def); err != nil {
			t.Errorf("%s: %v", name, err)
		}
	}
}

func TestExtensionsRoundTrip(t *testing.T) {
	msg := &pb.MyMessage{}
	ext1 := &pb.Ext{
		Data: proto.String("hi"),
	}
	ext2 := &pb.Ext{
		Data: proto.String("there"),
	}
	exists := proto.HasExtension(msg, pb.E_Ext_More)
	if exists {
		t.Error("Extension More present unexpectedly")
	}
	if err := proto.SetExtension(msg, pb.E_Ext_More, ext1); err != nil {
		t.Error(err)
	}
	if err := proto.SetExtension(msg, pb.E_Ext_More, ext2); err != nil {
		t.Error(err)
	}
	e, err := proto.GetExtension(msg, pb.E_Ext_More)
	if err != nil {
		t.Error(err)
	}
	x, ok := e.(*pb.Ext)
	if !ok {
		t.Errorf("e has type %T, expected testdata.Ext", e)
	} else if *x.Data != "there" {
		t.Errorf("SetExtension failed to overwrite, got %+v, not 'there'", x)
	}
	proto.ClearExtension(msg, pb.E_Ext_More)
	if _, err = proto.GetExtension(msg, pb.E_Ext_More); err != proto.ErrMissingExtension {
		t.Errorf("got %v, expected ErrMissingExtension", e)
	}
	if _, err := proto.GetExtension(msg, pb.E_X215); err == nil {
		t.Error("expected bad extension error, got nil")
	}
	if err := proto.SetExtension(msg, pb.E_X215, 12); err == nil {
		t.Error("expected extension err")
	}
	if err := proto.SetExtension(msg, pb.E_Ext_More, 12); err == nil {
		t.Error("expected some sort of type mismatch error, got nil")
	}
}

func TestNilExtension(t *testing.T) {
	msg := &pb.MyMessage{
		Count: proto.Int32(1),
	}
	if err := proto.SetExtension(msg, pb.E_Ext_Text, proto.String("hello")); err != nil {
		t.Fatal(err)
	}
	if err := proto.SetExtension(msg, pb.E_Ext_More, (*pb.Ext)(nil)); err == nil {
		t.Error("expected SetExtension to fail due to a nil extension")
	} else if want := "proto: SetExtension called with nil value of type *testdata.Ext"; err.Error() != want {
		t.Errorf("expected error %v, got %v", want, err)
	}
	// Note: if the behavior of Marshal is ever changed to ignore nil extensions, update
	// this test to verify that E_Ext_Text is properly propagated through marshal->unmarshal.
}
