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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++/server_credentials.h>
#include <grpc++/status.h>
#include <gtest/gtest.h>

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

namespace grpc {
namespace testing {
namespace {

const char kTopic[] = "test topic";
const char kSubscriptionName[] = "subscription name";
const char kData[] = "Message data";

class SubscriberServiceImpl : public tech::pubsub::SubscriberService::Service {
 public:
  Status CreateSubscription(
      ServerContext* context, const tech::pubsub::Subscription* request,
      tech::pubsub::Subscription* response) GRPC_OVERRIDE {
    EXPECT_EQ(request->topic(), kTopic);
    EXPECT_EQ(request->name(), kSubscriptionName);
    return Status::OK;
  }

  Status GetSubscription(ServerContext* context,
                         const tech::pubsub::GetSubscriptionRequest* request,
                         tech::pubsub::Subscription* response) GRPC_OVERRIDE {
    EXPECT_EQ(request->subscription(), kSubscriptionName);
    response->set_topic(kTopic);
    return Status::OK;
  }

  Status DeleteSubscription(
      ServerContext* context,
      const tech::pubsub::DeleteSubscriptionRequest* request,
      proto2::Empty* response) GRPC_OVERRIDE {
    EXPECT_EQ(request->subscription(), kSubscriptionName);
    return Status::OK;
  }

  Status Pull(ServerContext* context, const tech::pubsub::PullRequest* request,
              tech::pubsub::PullResponse* response) GRPC_OVERRIDE {
    EXPECT_EQ(request->subscription(), kSubscriptionName);
    response->set_ack_id("1");
    response->mutable_pubsub_event()->mutable_message()->set_data(kData);
    return Status::OK;
  }

  Status Acknowledge(ServerContext* context,
                     const tech::pubsub::AcknowledgeRequest* request,
                     proto2::Empty* response) GRPC_OVERRIDE {
    return Status::OK;
  }

};

class SubscriberTest : public ::testing::Test {
 protected:
  // Setup a server and a client for SubscriberService.
  void SetUp() GRPC_OVERRIDE {
    int port = grpc_pick_unused_port_or_die();
    server_address_ << "localhost:" << port;
    ServerBuilder builder;
    builder.AddListeningPort(server_address_.str(), grpc::InsecureServerCredentials());
    builder.RegisterService(&service_);
    server_ = builder.BuildAndStart();

    channel_ = CreateChannel(server_address_.str(), grpc::InsecureCredentials(), ChannelArguments());

    subscriber_.reset(new grpc::examples::pubsub::Subscriber(channel_));
  }

  void TearDown() GRPC_OVERRIDE {
    server_->Shutdown();
    subscriber_->Shutdown();
  }

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

  std::shared_ptr<ChannelInterface> channel_;

  std::unique_ptr<grpc::examples::pubsub::Subscriber> subscriber_;
};

TEST_F(SubscriberTest, TestSubscriber) {
  EXPECT_TRUE(subscriber_->CreateSubscription(kTopic,
                                              kSubscriptionName).IsOk());

  grpc::string topic;
  EXPECT_TRUE(subscriber_->GetSubscription(kSubscriptionName,
                                           &topic).IsOk());
  EXPECT_EQ(topic, kTopic);

  grpc::string data;
  EXPECT_TRUE(subscriber_->Pull(kSubscriptionName,
                                &data).IsOk());

  EXPECT_TRUE(subscriber_->DeleteSubscription(kSubscriptionName).IsOk());
}

}  // 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;
}