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#include <memory>

#include <grpc++/channel.h>
#include <grpc++/client_context.h>
#include <grpc++/create_channel.h>
#include <grpc++/server.h>
#include <grpc++/server_builder.h>
#include <grpc++/server_context.h>
#include <grpc/grpc.h>
#include <grpc/support/thd.h>
#include <grpc/support/time.h>
#include <gtest/gtest.h>

#include "src/proto/grpc/testing/duplicate/echo_duplicate.grpc.pb.h"
#include "src/proto/grpc/testing/echo.grpc.pb.h"
#include "test/core/util/port.h"
#include "test/core/util/test_config.h"
#include "test/cpp/util/string_ref_helper.h"

using grpc::testing::EchoRequest;
using grpc::testing::EchoResponse;

namespace grpc {
namespace testing {

namespace {

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

// Handlers to handle async request at a server. To be run in a separate thread.
void HandleEcho(::grpc::Service* service, ServerCompletionQueue* cq) {
  ServerContext srv_ctx;
  grpc::ServerAsyncResponseWriter<EcoResponse> response_writer(&srv_ctx);
  EchoRequest recv_request;
  EchoResponse send_response;
  service->RequestEcho(&srv_ctx, &recv_request, &response_writer, cq, cq, tag(1));
  Verify(cq, 1, true);
  send_response.set_message(recv_request.message());
  response_writer.Finish(send_response, Status::OK, tag(2));
  Verify(cq, 2, true);
}

void HandleClientStreaming(::grpc::Service* service, ServerCompletionQueue* cq) {
  ServerContext srv_ctx;
  EchoRequest recv_request;
  EchoResponse send_response;
  ServerAsyncReader<EchoResponse, EchoRequest> srv_stream(&srv_ctx);
  service_.RequestRequestStream(&srv_ctx, &srv_stream, cq, cq, tag(1));
  Verify(cq, 1, true);
  do {
    srv_stream.Read(&recv_request, tag(2));
  } while (VerifyReturnSuccess(2));
  srv_stream.Finish(send_response, Status::OK, tag(3));
  Verify(cq, 3, true);
}

class HybridEnd2endTest : public ::testing::Test {
 protected:
  HybridEnd2endTest() {}

  void SetUpServer(::grpc::Service* service) {
    int port = grpc_pick_unused_port_or_die();
    server_address_ << "localhost:" << port;

    // Setup server
    ServerBuilder builder;
    builder.AddListeningPort(server_address_.str(),
                             grpc::InsecureServerCredentials());
    builder.RegisterService(&service_);
    cq_ = builder.AddCompletionQueue();
    server_ = builder.BuildAndStart();
  }

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

  void ResetStub() {
    std::shared_ptr<Channel> channel =
        CreateChannel(server_address_.str(), InsecureChannelCredentials());
    stub_ = grpc::testing::EchoTestService::NewStub(channel);
  }

  void TestAllMethods() {
    SendEcho();
    SendSimpleClientStreaming();
  }

  void SendEcho() {
    EchoRequest send_request;
    EchoResponse recv_response;
    ClientContext cli_ctx;
    send_request.set_message("Hello");
    Status recv_status = stub_->Echo(&cli_ctx, send_request, &recv_response);
    EXPECT_EQ(send_request.message(), recv_response.message());
    EXPECT_TRUE(recv_status.ok());
  }

  void SendSimpleClientStreaming() {
    EchoRequest send_request;
    EchoResponse recv_response;
    ClientContext cli_ctx;
    send_request.set_message("Hello");
    auto stream = stub_->RequestStream(&cli_ctx, &recv_response);
    for (int i = 0; i < 5; i++) {
      EXPECT_TRUE(stream->Write(&send_request));
    }
    Status recv_status = stream->Finish();
    EXPECT_EQ(send_request.message(), recv_response.message());
    EXPECT_TRUE(recv_status.ok());
  }

  std::unique_ptr<ServerCompletionQueue> cq_;
  std::unique_ptr<grpc::testing::EchoTestService::Stub> stub_;
  std::unique_ptr<Server> server_;
  std::ostringstream server_address_;
};

TEST_F(HybridEnd2endTest, AsyncEchorequestStream) {
  WithAsyncMethod_Echo<WithAsyncMethod_RequestStream<EchoTestService> > service;
  SetUpServer(&service);
  ResetStub();
  std::thread echo_handler_thread(HandleEcho, &service, cq_.get());
  std::thread request_stream_thread(HandleClientStreaming, &service, cq_.get());
  TestAllMethods();
  echo_handler_thread.join();
  request_stream_thread.join();
}



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

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