package rpc

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io/ioutil"
	"testing"

	"github.com/gogo/protobuf/proto"
	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
	ethpb "github.com/prysmaticlabs/prysm/proto/eth/v1alpha1"
	"github.com/prysmaticlabs/prysm/shared/event"
	"github.com/prysmaticlabs/prysm/shared/params"
	"github.com/prysmaticlabs/prysm/shared/testutil"
	"github.com/sirupsen/logrus"
	logTest "github.com/sirupsen/logrus/hooks/test"
)

func init() {
	logrus.SetLevel(logrus.DebugLevel)
	logrus.SetOutput(ioutil.Discard)
}

type mockOperationService struct {
	pendingAttestations []*ethpb.Attestation
}

func (ms *mockOperationService) IncomingAttFeed() *event.Feed {
	return new(event.Feed)
}

func (ms *mockOperationService) IncomingExitFeed() *event.Feed {
	return new(event.Feed)
}

func (ms *mockOperationService) HandleAttestations(_ context.Context, _ proto.Message) error {
	return nil
}

func (ms *mockOperationService) IsAttCanonical(_ context.Context, att *ethpb.Attestation) (bool, error) {
	return true, nil
}

func (ms *mockOperationService) AttestationPool(_ context.Context, expectedSlot uint64) ([]*ethpb.Attestation, error) {
	if ms.pendingAttestations != nil {
		return ms.pendingAttestations, nil
	}
	return []*ethpb.Attestation{
		{
			AggregationBits: []byte{0xC0},
			Data: &ethpb.AttestationData{
				Crosslink: &ethpb.Crosslink{
					Shard:    params.BeaconConfig().SlotsPerEpoch,
					DataRoot: params.BeaconConfig().ZeroHash[:],
				},
			},
		},
		{
			AggregationBits: []byte{0xC1},
			Data: &ethpb.AttestationData{
				Crosslink: &ethpb.Crosslink{
					Shard:    params.BeaconConfig().SlotsPerEpoch,
					DataRoot: params.BeaconConfig().ZeroHash[:],
				},
			},
		},
		{
			AggregationBits: []byte{0xC2},
			Data: &ethpb.AttestationData{
				Crosslink: &ethpb.Crosslink{
					Shard:    params.BeaconConfig().SlotsPerEpoch,
					DataRoot: params.BeaconConfig().ZeroHash[:],
				},
			},
		},
	}, nil
}

type mockChainService struct {
	blockFeed            *event.Feed
	stateFeed            *event.Feed
	attestationFeed      *event.Feed
	stateInitializedFeed *event.Feed
	canonicalBlocks      map[uint64][]byte
	targets              map[uint64]*pb.AttestationTarget
}

func (m *mockChainService) StateInitializedFeed() *event.Feed {
	return m.stateInitializedFeed
}

func (m *mockChainService) ReceiveBlock(ctx context.Context, block *ethpb.BeaconBlock) (*pb.BeaconState, error) {
	return &pb.BeaconState{}, nil
}

func (m *mockChainService) ApplyForkChoiceRule(ctx context.Context, block *ethpb.BeaconBlock, computedState *pb.BeaconState) error {
	return nil
}

func (m *mockChainService) CanonicalBlockFeed() *event.Feed {
	return new(event.Feed)
}

func (m *mockChainService) UpdateCanonicalRoots(block *ethpb.BeaconBlock, root [32]byte) {

}

func (m mockChainService) SaveHistoricalState(beaconState *pb.BeaconState) error {
	return nil
}

func (m mockChainService) IsCanonical(slot uint64, hash []byte) bool {
	return bytes.Equal(m.canonicalBlocks[slot], hash)
}

func (m *mockChainService) AttestationTargets(justifiedState *pb.BeaconState) (map[uint64]*pb.AttestationTarget, error) {
	return m.targets, nil
}

func newMockChainService() *mockChainService {
	return &mockChainService{
		blockFeed:            new(event.Feed),
		stateFeed:            new(event.Feed),
		attestationFeed:      new(event.Feed),
		stateInitializedFeed: new(event.Feed),
	}
}

type mockSyncService struct {
}

func (ms *mockSyncService) Status() error {
	return nil
}

func (ms *mockSyncService) Syncing() bool {
	return false
}

func TestLifecycle_OK(t *testing.T) {
	hook := logTest.NewGlobal()
	rpcService := NewRPCService(context.Background(), &Config{
		Port:        "7348",
		CertFlag:    "alice.crt",
		KeyFlag:     "alice.key",
		SyncService: &mockSyncService{},
	})

	rpcService.Start()

	testutil.AssertLogsContain(t, hook, "Starting service")
	testutil.AssertLogsContain(t, hook, "Listening on port")

	rpcService.Stop()
	testutil.AssertLogsContain(t, hook, "Stopping service")

}

func TestRPC_BadEndpoint(t *testing.T) {
	hook := logTest.NewGlobal()

	rpcService := NewRPCService(context.Background(), &Config{
		Port:        "ralph merkle!!!",
		SyncService: &mockSyncService{},
	})

	testutil.AssertLogsDoNotContain(t, hook, "Could not listen to port in Start()")
	testutil.AssertLogsDoNotContain(t, hook, "Could not load TLS keys")
	testutil.AssertLogsDoNotContain(t, hook, "Could not serve gRPC")

	rpcService.Start()

	testutil.AssertLogsContain(t, hook, "Starting service")
	testutil.AssertLogsContain(t, hook, "Could not listen to port in Start()")

	rpcService.Stop()
}

func TestStatus_CredentialError(t *testing.T) {
	credentialErr := errors.New("credentialError")
	s := &Service{credentialError: credentialErr}

	if err := s.Status(); err != s.credentialError {
		t.Errorf("Wanted: %v, got: %v", s.credentialError, s.Status())
	}
}

func TestRPC_InsecureEndpoint(t *testing.T) {
	hook := logTest.NewGlobal()
	rpcService := NewRPCService(context.Background(), &Config{
		Port:        "7777",
		SyncService: &mockSyncService{},
	})

	rpcService.Start()

	testutil.AssertLogsContain(t, hook, "Starting service")
	testutil.AssertLogsContain(t, hook, fmt.Sprint("Listening on port"))
	testutil.AssertLogsContain(t, hook, "You are using an insecure gRPC connection")

	rpcService.Stop()
	testutil.AssertLogsContain(t, hook, "Stopping service")
}