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#include <google/protobuf/stubs/common.h>

#include <grpc++/channel_arguments.h>
#include <grpc++/channel_interface.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++/status.h>
#include <gtest/gtest.h>

#include "examples/pubsub/publisher.h"
#include "test/core/util/port.h"
#include "test/core/util/test_config.h"

using grpc::ChannelInterface;

namespace grpc {
namespace testing {
namespace {

const char kProjectId[] = "project id";
const char kTopic[] = "test topic";
const char kMessageData[] = "test message data";

class PublisherServiceImpl : public tech::pubsub::PublisherService::Service {
 public:
  Status CreateTopic(::grpc::ServerContext* context,
                     const ::tech::pubsub::Topic* request,
                     ::tech::pubsub::Topic* response) override {
    EXPECT_EQ(request->name(), kTopic);
    return Status::OK;
  }

  Status Publish(ServerContext* context,
                 const ::tech::pubsub::PublishRequest* request,
                 ::proto2::Empty* response) override {
    EXPECT_EQ(request->message().data(), kMessageData);
    return Status::OK;
  }

  Status GetTopic(ServerContext* context,
                  const ::tech::pubsub::GetTopicRequest* request,
                  ::tech::pubsub::Topic* response) override {
    EXPECT_EQ(request->topic(), kTopic);
    return Status::OK;
  }

 Status ListTopics(ServerContext* context,
                   const ::tech::pubsub::ListTopicsRequest* request,
                   ::tech::pubsub::ListTopicsResponse* response) override {
   std::ostringstream ss;
   ss << "cloud.googleapis.com/project in (/projects/" << kProjectId << ")";
   EXPECT_EQ(request->query(), ss.str());
   response->add_topic()->set_name(kTopic);
   return Status::OK;
 }

 Status DeleteTopic(ServerContext* context,
                    const ::tech::pubsub::DeleteTopicRequest* request,
                    ::proto2::Empty* response) override {
    EXPECT_EQ(request->topic(), kTopic);
    return Status::OK;
 }

};

class PublisherTest : public ::testing::Test {
 protected:
  // Setup a server and a client for PublisherService.
  void SetUp() override {
    int port = grpc_pick_unused_port_or_die();
    server_address_ << "localhost:" << port;
    ServerBuilder builder;
    builder.AddPort(server_address_.str());
    builder.RegisterService(&service_);
    server_ = builder.BuildAndStart();

    channel_ = CreateChannel(server_address_.str(), ChannelArguments());

    publisher_.reset(new grpc::examples::pubsub::Publisher(channel_));
  }

  void TearDown() override {
    server_->Shutdown();
    publisher_->Shutdown();
  }

  std::ostringstream server_address_;
  std::unique_ptr<Server> server_;
  PublisherServiceImpl service_;

  std::shared_ptr<ChannelInterface> channel_;

  std::unique_ptr<grpc::examples::pubsub::Publisher> publisher_;
};

TEST_F(PublisherTest, TestPublisher) {
  EXPECT_TRUE(publisher_->CreateTopic(kTopic).IsOk());

  EXPECT_TRUE(publisher_->Publish(kTopic, kMessageData).IsOk());

  EXPECT_TRUE(publisher_->GetTopic(kTopic).IsOk());

  std::vector<grpc::string> topics;
  EXPECT_TRUE(publisher_->ListTopics(kProjectId, &topics).IsOk());
  EXPECT_EQ(topics.size(), 1);
  EXPECT_EQ(topics[0], kTopic);
}

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

int main(int argc, char** argv) {
  grpc_test_init(argc, argv);
  grpc_init();
  ::testing::InitGoogleTest(&argc, argv);
  gpr_log(GPR_INFO, "Start test ...");
  int result = RUN_ALL_TESTS();
  grpc_shutdown();
  return result;
}