/*
 *
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#include <chrono>
#include <memory>

#include "test/core/util/test_config.h"
#include "test/cpp/util/echo_duplicate.pb.h"
#include "test/cpp/util/echo.pb.h"
#include "src/cpp/util/time.h"
#include <grpc++/async_unary_call.h>
#include <grpc++/channel_arguments.h>
#include <grpc++/channel_interface.h>
#include <grpc++/client_context.h>
#include <grpc++/create_channel.h>
#include <grpc++/credentials.h>
#include <grpc++/server.h>
#include <grpc++/server_builder.h>
#include <grpc++/server_context.h>
#include <grpc++/server_credentials.h>
#include <grpc++/status.h>
#include <grpc++/stream.h>
#include "test/core/util/port.h"
#include <gtest/gtest.h>

#include <grpc/grpc.h>
#include <grpc/support/thd.h>
#include <grpc/support/time.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);
}

class AsyncEnd2endTest : public ::testing::Test {
 protected:
  AsyncEnd2endTest() : service_(&srv_cq_) {}

  void SetUp() override {
    int port = grpc_pick_unused_port_or_die();
    server_address_ << "localhost:" << port;
    // Setup server
    ServerBuilder builder;
    builder.AddPort(server_address_.str(), grpc::InsecureServerCredentials());
    builder.RegisterAsyncService(&service_);
    server_ = builder.BuildAndStart();
  }

  void TearDown() 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<ChannelInterface> channel = CreateChannel(
        server_address_.str(), InsecureCredentials(), ChannelArguments());
    stub_.reset(grpc::cpp::test::util::TestService::NewStub(channel));
  }

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

  void SendRpc(int num_rpcs) {
    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;
      ServerContext srv_ctx;
      grpc::ServerAsyncResponseWriter<EchoResponse> response_writer(&srv_ctx);

      send_request.set_message("Hello");
      std::unique_ptr<ClientAsyncResponseReader<EchoResponse> > response_reader(
          stub_->Echo(&cli_ctx, send_request, &cli_cq_, tag(1)));

      service_.RequestEcho(&srv_ctx, &recv_request, &response_writer, &srv_cq_,
                           tag(2));

      server_ok(2);
      EXPECT_EQ(send_request.message(), recv_request.message());
      client_ok(1);

      send_response.set_message(recv_request.message());
      response_writer.Finish(send_response, Status::OK, tag(3));
      server_ok(3);

      response_reader->Finish(&recv_response, &recv_status, tag(4));
      client_ok(4);

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

  CompletionQueue cli_cq_;
  CompletionQueue srv_cq_;
  std::unique_ptr<grpc::cpp::test::util::TestService::Stub> stub_;
  std::unique_ptr<Server> server_;
  grpc::cpp::test::util::TestService::AsyncService service_;
  std::ostringstream server_address_;
};

TEST_F(AsyncEnd2endTest, SimpleRpc) {
  ResetStub();
  SendRpc(1);
}

TEST_F(AsyncEnd2endTest, SequentialRpcs) {
  ResetStub();
  SendRpc(10);
}

// Two pings and a final pong.
TEST_F(AsyncEnd2endTest, SimpleClientStreaming) {
  ResetStub();

  EchoRequest send_request;
  EchoRequest recv_request;
  EchoResponse send_response;
  EchoResponse recv_response;
  Status recv_status;
  ClientContext cli_ctx;
  ServerContext srv_ctx;
  ServerAsyncReader<EchoResponse, EchoRequest> srv_stream(&srv_ctx);

  send_request.set_message("Hello");
  std::unique_ptr<ClientAsyncWriter<EchoRequest> > cli_stream(
      stub_->RequestStream(&cli_ctx, &recv_response, &cli_cq_, tag(1)));

  service_.RequestRequestStream(&srv_ctx, &srv_stream, &srv_cq_, tag(2));

  server_ok(2);
  client_ok(1);

  cli_stream->Write(send_request, tag(3));
  client_ok(3);

  srv_stream.Read(&recv_request, tag(4));
  server_ok(4);
  EXPECT_EQ(send_request.message(), recv_request.message());

  cli_stream->Write(send_request, tag(5));
  client_ok(5);

  srv_stream.Read(&recv_request, tag(6));
  server_ok(6);

  EXPECT_EQ(send_request.message(), recv_request.message());
  cli_stream->WritesDone(tag(7));
  client_ok(7);

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

  send_response.set_message(recv_request.message());
  srv_stream.Finish(send_response, 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.IsOk());
}

// One ping, two pongs.
TEST_F(AsyncEnd2endTest, SimpleServerStreaming) {
  ResetStub();

  EchoRequest send_request;
  EchoRequest recv_request;
  EchoResponse send_response;
  EchoResponse recv_response;
  Status recv_status;
  ClientContext cli_ctx;
  ServerContext srv_ctx;
  ServerAsyncWriter<EchoResponse> srv_stream(&srv_ctx);

  send_request.set_message("Hello");
  std::unique_ptr<ClientAsyncReader<EchoResponse> > cli_stream(
      stub_->ResponseStream(&cli_ctx, send_request, &cli_cq_, tag(1)));

  service_.RequestResponseStream(&srv_ctx, &recv_request, &srv_stream, &srv_cq_,
                                 tag(2));

  server_ok(2);
  client_ok(1);
  EXPECT_EQ(send_request.message(), recv_request.message());

  send_response.set_message(recv_request.message());
  srv_stream.Write(send_response, tag(3));
  server_ok(3);

  cli_stream->Read(&recv_response, tag(4));
  client_ok(4);
  EXPECT_EQ(send_response.message(), recv_response.message());

  srv_stream.Write(send_response, tag(5));
  server_ok(5);

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

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

  cli_stream->Read(&recv_response, tag(8));
  client_fail(8);

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

  EXPECT_TRUE(recv_status.IsOk());
}

// One ping, one pong.
TEST_F(AsyncEnd2endTest, SimpleBidiStreaming) {
  ResetStub();

  EchoRequest send_request;
  EchoRequest recv_request;
  EchoResponse send_response;
  EchoResponse recv_response;
  Status recv_status;
  ClientContext cli_ctx;
  ServerContext srv_ctx;
  ServerAsyncReaderWriter<EchoResponse, EchoRequest> srv_stream(&srv_ctx);

  send_request.set_message("Hello");
  std::unique_ptr<ClientAsyncReaderWriter<EchoRequest, EchoResponse> >
      cli_stream(stub_->BidiStream(&cli_ctx, &cli_cq_, tag(1)));

  service_.RequestBidiStream(&srv_ctx, &srv_stream, &srv_cq_, tag(2));

  server_ok(2);
  client_ok(1);

  cli_stream->Write(send_request, tag(3));
  client_ok(3);

  srv_stream.Read(&recv_request, tag(4));
  server_ok(4);
  EXPECT_EQ(send_request.message(), recv_request.message());

  send_response.set_message(recv_request.message());
  srv_stream.Write(send_response, tag(5));
  server_ok(5);

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

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

  srv_stream.Read(&recv_request, 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_TRUE(recv_status.IsOk());
}

// Metadata tests
TEST_F(AsyncEnd2endTest, ClientInitialMetadataRpc) {
  ResetStub();

  EchoRequest send_request;
  EchoRequest recv_request;
  EchoResponse send_response;
  EchoResponse recv_response;
  Status recv_status;

  ClientContext cli_ctx;
  ServerContext srv_ctx;
  grpc::ServerAsyncResponseWriter<EchoResponse> response_writer(&srv_ctx);

  send_request.set_message("Hello");
  std::pair<grpc::string, grpc::string> meta1("key1", "val1");
  std::pair<grpc::string, grpc::string> meta2("key2", "val2");
  cli_ctx.AddMetadata(meta1.first, meta1.second);
  cli_ctx.AddMetadata(meta2.first, meta2.second);

  std::unique_ptr<ClientAsyncResponseReader<EchoResponse> > response_reader(
      stub_->Echo(&cli_ctx, send_request, &cli_cq_, tag(1)));

  service_.RequestEcho(&srv_ctx, &recv_request, &response_writer, &srv_cq_,
                       tag(2));
  server_ok(2);
  EXPECT_EQ(send_request.message(), recv_request.message());
  auto client_initial_metadata = srv_ctx.client_metadata();
  EXPECT_EQ(meta1.second, client_initial_metadata.find(meta1.first)->second);
  EXPECT_EQ(meta2.second, client_initial_metadata.find(meta2.first)->second);
  EXPECT_EQ(static_cast<size_t>(2), client_initial_metadata.size());
  client_ok(1);

  send_response.set_message(recv_request.message());
  response_writer.Finish(send_response, Status::OK, tag(3));

  server_ok(3);

  response_reader->Finish(&recv_response, &recv_status, tag(4));
  client_ok(4);

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

TEST_F(AsyncEnd2endTest, ServerInitialMetadataRpc) {
  ResetStub();

  EchoRequest send_request;
  EchoRequest recv_request;
  EchoResponse send_response;
  EchoResponse recv_response;
  Status recv_status;

  ClientContext cli_ctx;
  ServerContext srv_ctx;
  grpc::ServerAsyncResponseWriter<EchoResponse> response_writer(&srv_ctx);

  send_request.set_message("Hello");
  std::pair<grpc::string, grpc::string> meta1("key1", "val1");
  std::pair<grpc::string, grpc::string> meta2("key2", "val2");

  std::unique_ptr<ClientAsyncResponseReader<EchoResponse> > response_reader(
      stub_->Echo(&cli_ctx, send_request, &cli_cq_, tag(1)));

  service_.RequestEcho(&srv_ctx, &recv_request, &response_writer, &srv_cq_,
                       tag(2));
  server_ok(2);
  EXPECT_EQ(send_request.message(), recv_request.message());
  srv_ctx.AddInitialMetadata(meta1.first, meta1.second);
  srv_ctx.AddInitialMetadata(meta2.first, meta2.second);
  client_ok(1);
  response_writer.SendInitialMetadata(tag(3));
  server_ok(3);

  response_reader->ReadInitialMetadata(tag(4));
  client_ok(4);
  auto server_initial_metadata = cli_ctx.GetServerInitialMetadata();
  EXPECT_EQ(meta1.second, server_initial_metadata.find(meta1.first)->second);
  EXPECT_EQ(meta2.second, server_initial_metadata.find(meta2.first)->second);
  EXPECT_EQ(static_cast<size_t>(2), server_initial_metadata.size());

  send_response.set_message(recv_request.message());
  response_writer.Finish(send_response, Status::OK, tag(5));
  server_ok(5);

  response_reader->Finish(&recv_response, &recv_status, tag(6));
  client_ok(6);

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

TEST_F(AsyncEnd2endTest, ServerTrailingMetadataRpc) {
  ResetStub();

  EchoRequest send_request;
  EchoRequest recv_request;
  EchoResponse send_response;
  EchoResponse recv_response;
  Status recv_status;

  ClientContext cli_ctx;
  ServerContext srv_ctx;
  grpc::ServerAsyncResponseWriter<EchoResponse> response_writer(&srv_ctx);

  send_request.set_message("Hello");
  std::pair<grpc::string, grpc::string> meta1("key1", "val1");
  std::pair<grpc::string, grpc::string> meta2("key2", "val2");

  std::unique_ptr<ClientAsyncResponseReader<EchoResponse> > response_reader(
      stub_->Echo(&cli_ctx, send_request, &cli_cq_, tag(1)));

  service_.RequestEcho(&srv_ctx, &recv_request, &response_writer, &srv_cq_,
                       tag(2));
  server_ok(2);
  EXPECT_EQ(send_request.message(), recv_request.message());
  response_writer.SendInitialMetadata(tag(3));
  server_ok(3);
  client_ok(1);

  send_response.set_message(recv_request.message());
  srv_ctx.AddTrailingMetadata(meta1.first, meta1.second);
  srv_ctx.AddTrailingMetadata(meta2.first, meta2.second);
  response_writer.Finish(send_response, Status::OK, tag(4));

  server_ok(4);

  response_reader->Finish(&recv_response, &recv_status, tag(5));
  client_ok(5);
  EXPECT_EQ(send_response.message(), recv_response.message());
  EXPECT_TRUE(recv_status.IsOk());
  auto server_trailing_metadata = cli_ctx.GetServerTrailingMetadata();
  EXPECT_EQ(meta1.second, server_trailing_metadata.find(meta1.first)->second);
  EXPECT_EQ(meta2.second, server_trailing_metadata.find(meta2.first)->second);
  EXPECT_EQ(static_cast<size_t>(2), server_trailing_metadata.size());
}

TEST_F(AsyncEnd2endTest, MetadataRpc) {
  ResetStub();

  EchoRequest send_request;
  EchoRequest recv_request;
  EchoResponse send_response;
  EchoResponse recv_response;
  Status recv_status;

  ClientContext cli_ctx;
  ServerContext srv_ctx;
  grpc::ServerAsyncResponseWriter<EchoResponse> response_writer(&srv_ctx);

  send_request.set_message("Hello");
  std::pair<grpc::string, grpc::string> meta1("key1", "val1");
  std::pair<grpc::string, grpc::string> meta2(
      "key2-bin", {"\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc", 13});
  std::pair<grpc::string, grpc::string> meta3("key3", "val3");
  std::pair<grpc::string, grpc::string> meta6(
      "key4-bin",
      {"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d", 14});
  std::pair<grpc::string, grpc::string> meta5("key5", "val5");
  std::pair<grpc::string, grpc::string> meta4(
      "key6-bin",
      {"\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee", 15});

  cli_ctx.AddMetadata(meta1.first, meta1.second);
  cli_ctx.AddMetadata(meta2.first, meta2.second);

  std::unique_ptr<ClientAsyncResponseReader<EchoResponse> > response_reader(
      stub_->Echo(&cli_ctx, send_request, &cli_cq_, tag(1)));

  service_.RequestEcho(&srv_ctx, &recv_request, &response_writer, &srv_cq_,
                       tag(2));
  server_ok(2);
  EXPECT_EQ(send_request.message(), recv_request.message());
  auto client_initial_metadata = srv_ctx.client_metadata();
  EXPECT_EQ(meta1.second, client_initial_metadata.find(meta1.first)->second);
  EXPECT_EQ(meta2.second, client_initial_metadata.find(meta2.first)->second);
  EXPECT_EQ(static_cast<size_t>(2), client_initial_metadata.size());
  client_ok(1);

  srv_ctx.AddInitialMetadata(meta3.first, meta3.second);
  srv_ctx.AddInitialMetadata(meta4.first, meta4.second);
  response_writer.SendInitialMetadata(tag(3));
  server_ok(3);
  response_reader->ReadInitialMetadata(tag(4));
  client_ok(4);
  auto server_initial_metadata = cli_ctx.GetServerInitialMetadata();
  EXPECT_EQ(meta3.second, server_initial_metadata.find(meta3.first)->second);
  EXPECT_EQ(meta4.second, server_initial_metadata.find(meta4.first)->second);
  EXPECT_EQ(static_cast<size_t>(2), server_initial_metadata.size());

  send_response.set_message(recv_request.message());
  srv_ctx.AddTrailingMetadata(meta5.first, meta5.second);
  srv_ctx.AddTrailingMetadata(meta6.first, meta6.second);
  response_writer.Finish(send_response, Status::OK, tag(5));

  server_ok(5);

  response_reader->Finish(&recv_response, &recv_status, tag(6));
  client_ok(6);
  EXPECT_EQ(send_response.message(), recv_response.message());
  EXPECT_TRUE(recv_status.IsOk());
  auto server_trailing_metadata = cli_ctx.GetServerTrailingMetadata();
  EXPECT_EQ(meta5.second, server_trailing_metadata.find(meta5.first)->second);
  EXPECT_EQ(meta6.second, server_trailing_metadata.find(meta6.first)->second);
  EXPECT_EQ(static_cast<size_t>(2), server_trailing_metadata.size());
}
}  // namespace
}  // namespace testing
}  // namespace grpc

int main(int argc, char** argv) {
  grpc_test_init(argc, argv);
  grpc_init();
  ::testing::InitGoogleTest(&argc, argv);
  int result = RUN_ALL_TESTS();
  grpc_shutdown();
  google::protobuf::ShutdownProtobufLibrary();
  return result;
}