package rpc

import (
	"context"
	"errors"
	"testing"

	ptypes "github.com/gogo/protobuf/types"
	"github.com/golang/mock/gomock"
	"github.com/prysmaticlabs/prysm/beacon-chain/internal"
	pbp2p "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
	"github.com/prysmaticlabs/prysm/shared/testutil"
	logTest "github.com/sirupsen/logrus/hooks/test"
)

func TestLatestAttestationContextClosed(t *testing.T) {
	hook := logTest.NewGlobal()
	mockAttestationService := &mockAttestationService{}
	ctx, cancel := context.WithCancel(context.Background())
	beaconServer := &BeaconServer{
		ctx:                ctx,
		attestationService: mockAttestationService,
	}
	exitRoutine := make(chan bool)
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()
	mockStream := internal.NewMockBeaconService_LatestAttestationServer(ctrl)
	go func(tt *testing.T) {
		if err := beaconServer.LatestAttestation(&ptypes.Empty{}, mockStream); err != nil {
			tt.Errorf("Could not call RPC method: %v", err)
		}
		<-exitRoutine
	}(t)
	cancel()
	exitRoutine <- true
	testutil.AssertLogsContain(t, hook, "RPC context closed, exiting goroutine")
}

func TestLatestAttestationFaulty(t *testing.T) {
	attestationService := &mockAttestationService{}
	ctx, cancel := context.WithCancel(context.Background())
	beaconServer := &BeaconServer{
		ctx:                 ctx,
		attestationService:  attestationService,
		incomingAttestation: make(chan *pbp2p.Attestation, 0),
	}
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	exitRoutine := make(chan bool)
	attestation := &pbp2p.Attestation{}

	mockStream := internal.NewMockBeaconService_LatestAttestationServer(ctrl)
	mockStream.EXPECT().Send(attestation).Return(errors.New("something wrong"))
	// Tests a faulty stream.
	go func(tt *testing.T) {
		if err := beaconServer.LatestAttestation(&ptypes.Empty{}, mockStream); err.Error() != "something wrong" {
			tt.Errorf("Faulty stream should throw correct error, wanted 'something wrong', got %v", err)
		}
		<-exitRoutine
	}(t)

	beaconServer.incomingAttestation <- attestation
	cancel()
	exitRoutine <- true
}

func TestLatestAttestation(t *testing.T) {
	hook := logTest.NewGlobal()
	attestationService := &mockAttestationService{}
	ctx, cancel := context.WithCancel(context.Background())
	beaconServer := &BeaconServer{
		ctx:                 ctx,
		attestationService:  attestationService,
		incomingAttestation: make(chan *pbp2p.Attestation, 0),
	}
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	exitRoutine := make(chan bool)
	attestation := &pbp2p.Attestation{}
	mockStream := internal.NewMockBeaconService_LatestAttestationServer(ctrl)
	mockStream.EXPECT().Send(attestation).Return(nil)
	// Tests a good stream.
	go func(tt *testing.T) {
		if err := beaconServer.LatestAttestation(&ptypes.Empty{}, mockStream); err != nil {
			tt.Errorf("Could not call RPC method: %v", err)
		}
		<-exitRoutine
	}(t)
	beaconServer.incomingAttestation <- attestation
	cancel()
	exitRoutine <- true

	testutil.AssertLogsContain(t, hook, "Sending attestation to RPC clients")
}