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#include <memory>

#include <grpc/grpc.h>
#include <grpc/support/thd.h>
#include <grpc/support/time.h>
#include <grpc++/impl/proto_utils.h>
#include <grpc++/channel.h>
#include <grpc++/client_context.h>
#include <grpc++/create_channel.h>
#include <grpc++/credentials.h>
#include <grpc++/generic/async_generic_service.h>
#include <grpc++/generic/generic_stub.h>
#include <grpc++/server.h>
#include <grpc++/server_builder.h>
#include <grpc++/server_context.h>
#include <grpc++/server_credentials.h>
#include <grpc++/support/slice.h>
#include <gtest/gtest.h>

#include "test/core/util/port.h"
#include "test/core/util/test_config.h"
#include "test/cpp/util/echo.grpc.pb.h"

using grpc::cpp::test::util::EchoRequest;
using grpc::cpp::test::util::EchoResponse;
using std::chrono::system_clock;

namespace grpc {
namespace testing {
namespace {

void* tag(int i) { return (void*)(gpr_intptr)i; }

void verify_ok(CompletionQueue* cq, int i, bool expect_ok) {
  bool ok;
  void* got_tag;
  EXPECT_TRUE(cq->Next(&got_tag, &ok));
  EXPECT_EQ(expect_ok, ok);
  EXPECT_EQ(tag(i), got_tag);
}

bool ParseFromByteBuffer(ByteBuffer* buffer, grpc::protobuf::Message* message) {
  std::vector<Slice> slices;
  buffer->Dump(&slices);
  grpc::string buf;
  buf.reserve(buffer->Length());
  for (auto s = slices.begin(); s != slices.end(); s++) {
    buf.append(reinterpret_cast<const char*>(s->begin()), s->size());
  }
  return message->ParseFromString(buf);
}

std::unique_ptr<ByteBuffer> SerializeToByteBuffer(
    grpc::protobuf::Message* message) {
  grpc::string buf;
  message->SerializeToString(&buf);
  gpr_slice s = gpr_slice_from_copied_string(buf.c_str());
  Slice slice(s, Slice::STEAL_REF);
  return std::unique_ptr<ByteBuffer>(new ByteBuffer(&slice, 1));
}

class GenericEnd2endTest : public ::testing::Test {
 protected:
  GenericEnd2endTest() : generic_service_("*"), server_host_("localhost") {}

  void SetUp() GRPC_OVERRIDE {
    int port = grpc_pick_unused_port_or_die();
    server_address_ << server_host_ << ":" << port;
    // Setup server
    ServerBuilder builder;
    builder.AddListeningPort(server_address_.str(),
                             InsecureServerCredentials());
    builder.RegisterAsyncGenericService(&generic_service_);
    srv_cq_ = builder.AddCompletionQueue();
    server_ = builder.BuildAndStart();
  }

  void TearDown() GRPC_OVERRIDE {
    server_->Shutdown();
    void* ignored_tag;
    bool ignored_ok;
    cli_cq_.Shutdown();
    srv_cq_->Shutdown();
    while (cli_cq_.Next(&ignored_tag, &ignored_ok))
      ;
    while (srv_cq_->Next(&ignored_tag, &ignored_ok))
      ;
  }

  void ResetStub() {
    std::shared_ptr<Channel> channel =
        CreateChannel(server_address_.str(), InsecureCredentials());
    generic_stub_.reset(new GenericStub(channel));
  }

  void server_ok(int i) { verify_ok(srv_cq_.get(), i, true); }
  void client_ok(int i) { verify_ok(&cli_cq_, i, true); }
  void server_fail(int i) { verify_ok(srv_cq_.get(), i, false); }
  void client_fail(int i) { verify_ok(&cli_cq_, i, false); }

  void SendRpc(int num_rpcs) {
    const grpc::string kMethodName("/grpc.cpp.test.util.TestService/Echo");
    for (int i = 0; i < num_rpcs; i++) {
      EchoRequest send_request;
      EchoRequest recv_request;
      EchoResponse send_response;
      EchoResponse recv_response;
      Status recv_status;

      ClientContext cli_ctx;
      GenericServerContext srv_ctx;
      GenericServerAsyncReaderWriter stream(&srv_ctx);

      // The string needs to be long enough to test heap-based slice.
      send_request.set_message("Hello world. Hello world. Hello world.");
      std::unique_ptr<GenericClientAsyncReaderWriter> call =
          generic_stub_->Call(&cli_ctx, kMethodName, &cli_cq_, tag(1));
      client_ok(1);
      std::unique_ptr<ByteBuffer> send_buffer =
          SerializeToByteBuffer(&send_request);
      call->Write(*send_buffer, tag(2));
      client_ok(2);
      call->WritesDone(tag(3));
      client_ok(3);

      generic_service_.RequestCall(&srv_ctx, &stream, srv_cq_.get(),
                                   srv_cq_.get(), tag(4));

      verify_ok(srv_cq_.get(), 4, true);
      EXPECT_EQ(server_host_, srv_ctx.host().substr(0, server_host_.length()));
      EXPECT_EQ(kMethodName, srv_ctx.method());
      ByteBuffer recv_buffer;
      stream.Read(&recv_buffer, tag(5));
      server_ok(5);
      EXPECT_TRUE(ParseFromByteBuffer(&recv_buffer, &recv_request));
      EXPECT_EQ(send_request.message(), recv_request.message());

      send_response.set_message(recv_request.message());
      send_buffer = SerializeToByteBuffer(&send_response);
      stream.Write(*send_buffer, tag(6));
      server_ok(6);

      stream.Finish(Status::OK, tag(7));
      server_ok(7);

      recv_buffer.Clear();
      call->Read(&recv_buffer, tag(8));
      client_ok(8);
      EXPECT_TRUE(ParseFromByteBuffer(&recv_buffer, &recv_response));

      call->Finish(&recv_status, tag(9));
      client_ok(9);

      EXPECT_EQ(send_response.message(), recv_response.message());
      EXPECT_TRUE(recv_status.ok());
    }
  }

  CompletionQueue cli_cq_;
  std::unique_ptr<ServerCompletionQueue> srv_cq_;
  std::unique_ptr<grpc::cpp::test::util::TestService::Stub> stub_;
  std::unique_ptr<grpc::GenericStub> generic_stub_;
  std::unique_ptr<Server> server_;
  AsyncGenericService generic_service_;
  const grpc::string server_host_;
  std::ostringstream server_address_;
};

TEST_F(GenericEnd2endTest, SimpleRpc) {
  ResetStub();
  SendRpc(1);
}

TEST_F(GenericEnd2endTest, SequentialRpcs) {
  ResetStub();
  SendRpc(10);
}

// One ping, one pong.
TEST_F(GenericEnd2endTest, SimpleBidiStreaming) {
  ResetStub();

  const grpc::string kMethodName("/grpc.cpp.test.util.TestService/BidiStream");
  EchoRequest send_request;
  EchoRequest recv_request;
  EchoResponse send_response;
  EchoResponse recv_response;
  Status recv_status;
  ClientContext cli_ctx;
  GenericServerContext srv_ctx;
  GenericServerAsyncReaderWriter srv_stream(&srv_ctx);

  cli_ctx.set_compression_algorithm(GRPC_COMPRESS_GZIP);
  send_request.set_message("Hello");
  std::unique_ptr<GenericClientAsyncReaderWriter> cli_stream =
      generic_stub_->Call(&cli_ctx, kMethodName, &cli_cq_, tag(1));
  client_ok(1);

  generic_service_.RequestCall(&srv_ctx, &srv_stream, srv_cq_.get(),
                               srv_cq_.get(), tag(2));

  verify_ok(srv_cq_.get(), 2, true);
  EXPECT_EQ(server_host_, srv_ctx.host().substr(0, server_host_.length()));
  EXPECT_EQ(kMethodName, srv_ctx.method());

  std::unique_ptr<ByteBuffer> send_buffer =
      SerializeToByteBuffer(&send_request);
  cli_stream->Write(*send_buffer, tag(3));
  client_ok(3);

  ByteBuffer recv_buffer;
  srv_stream.Read(&recv_buffer, tag(4));
  server_ok(4);
  EXPECT_TRUE(ParseFromByteBuffer(&recv_buffer, &recv_request));
  EXPECT_EQ(send_request.message(), recv_request.message());

  send_response.set_message(recv_request.message());
  send_buffer = SerializeToByteBuffer(&send_response);
  srv_stream.Write(*send_buffer, tag(5));
  server_ok(5);

  cli_stream->Read(&recv_buffer, tag(6));
  client_ok(6);
  EXPECT_TRUE(ParseFromByteBuffer(&recv_buffer, &recv_response));
  EXPECT_EQ(send_response.message(), recv_response.message());

  cli_stream->WritesDone(tag(7));
  client_ok(7);

  srv_stream.Read(&recv_buffer, tag(8));
  server_fail(8);

  srv_stream.Finish(Status::OK, tag(9));
  server_ok(9);

  cli_stream->Finish(&recv_status, tag(10));
  client_ok(10);

  EXPECT_EQ(send_response.message(), recv_response.message());
  EXPECT_TRUE(recv_status.ok());
}

}  // namespace
}  // namespace testing
}  // namespace grpc

int main(int argc, char** argv) {
  grpc_test_init(argc, argv);
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}