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#include "test/cpp/interop/interop_client.h"

#include <memory>

#include <unistd.h>

#include <grpc/grpc.h>
#include <grpc/support/log.h>
#include <grpc++/channel_interface.h>
#include <grpc++/client_context.h>
#include <grpc++/status.h>
#include <grpc++/stream.h>
#include "test/proto/test.grpc.pb.h"
#include "test/cpp/interop/empty.grpc.pb.h"
#include "test/cpp/interop/messages.grpc.pb.h"

namespace grpc {
namespace testing {

namespace {
// The same value is defined by the Java client.
const std::vector<int> request_stream_sizes = {27182, 8, 1828, 45904};
const std::vector<int> response_stream_sizes = {31415, 9, 2653, 58979};
const int kNumResponseMessages = 2000;
const int kResponseMessageSize = 1030;
const int kReceiveDelayMilliSeconds = 20;
const int kLargeRequestSize = 314159;
const int kLargeResponseSize = 271812;
}  // namespace

InteropClient::InteropClient(std::shared_ptr<ChannelInterface> channel)
    : channel_(channel) {}

void InteropClient::AssertOkOrPrintErrorStatus(const Status& s) {
  if (s.IsOk()) {
    return;
  }
  gpr_log(GPR_INFO, "Error status code: %d, message: %s", s.code(),
          s.details().c_str());
  GPR_ASSERT(0);
}

void InteropClient::DoEmpty() {
  gpr_log(GPR_INFO, "Sending an empty rpc...");
  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));

  Empty request = Empty::default_instance();
  Empty response = Empty::default_instance();
  ClientContext context;

  Status s = stub->EmptyCall(&context, request, &response);
  AssertOkOrPrintErrorStatus(s);

  gpr_log(GPR_INFO, "Empty rpc done.");
}

// Shared code to set large payload, make rpc and check response payload.
void InteropClient::PerformLargeUnary(SimpleRequest* request,
                                      SimpleResponse* response) {
  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));

  ClientContext context;
  request->set_response_type(PayloadType::COMPRESSABLE);
  request->set_response_size(kLargeResponseSize);
  grpc::string payload(kLargeRequestSize, '\0');
  request->mutable_payload()->set_body(payload.c_str(), kLargeRequestSize);

  Status s = stub->UnaryCall(&context, *request, response);

  AssertOkOrPrintErrorStatus(s);
  GPR_ASSERT(response->payload().type() == PayloadType::COMPRESSABLE);
  GPR_ASSERT(response->payload().body() ==
             grpc::string(kLargeResponseSize, '\0'));
}

void InteropClient::DoComputeEngineCreds(
    const grpc::string& default_service_account,
    const grpc::string& oauth_scope) {
  gpr_log(GPR_INFO,
          "Sending a large unary rpc with compute engine credentials ...");
  SimpleRequest request;
  SimpleResponse response;
  request.set_fill_username(true);
  request.set_fill_oauth_scope(true);
  PerformLargeUnary(&request, &response);
  gpr_log(GPR_INFO, "Got username %s", response.username().c_str());
  gpr_log(GPR_INFO, "Got oauth_scope %s", response.oauth_scope().c_str());
  GPR_ASSERT(!response.username().empty());
  GPR_ASSERT(response.username().c_str() == default_service_account);
  GPR_ASSERT(!response.oauth_scope().empty());
  const char* oauth_scope_str = response.oauth_scope().c_str();
  GPR_ASSERT(oauth_scope.find(oauth_scope_str) != grpc::string::npos);
  gpr_log(GPR_INFO, "Large unary with compute engine creds done.");
}

void InteropClient::DoServiceAccountCreds(const grpc::string& username,
                                          const grpc::string& oauth_scope) {
  gpr_log(GPR_INFO,
          "Sending a large unary rpc with service account credentials ...");
  SimpleRequest request;
  SimpleResponse response;
  request.set_fill_username(true);
  request.set_fill_oauth_scope(true);
  PerformLargeUnary(&request, &response);
  GPR_ASSERT(!response.username().empty());
  GPR_ASSERT(!response.oauth_scope().empty());
  GPR_ASSERT(username.find(response.username()) != grpc::string::npos);
  const char* oauth_scope_str = response.oauth_scope().c_str();
  GPR_ASSERT(oauth_scope.find(oauth_scope_str) != grpc::string::npos);
  gpr_log(GPR_INFO, "Large unary with service account creds done.");
}

void InteropClient::DoJwtTokenCreds(const grpc::string& username) {
  gpr_log(GPR_INFO, "Sending a large unary rpc with JWT token credentials ...");
  SimpleRequest request;
  SimpleResponse response;
  request.set_fill_username(true);
  PerformLargeUnary(&request, &response);
  GPR_ASSERT(!response.username().empty());
  GPR_ASSERT(username.find(response.username()) != grpc::string::npos);
  gpr_log(GPR_INFO, "Large unary with JWT token creds done.");
}

void InteropClient::DoLargeUnary() {
  gpr_log(GPR_INFO, "Sending a large unary rpc...");
  SimpleRequest request;
  SimpleResponse response;
  PerformLargeUnary(&request, &response);
  gpr_log(GPR_INFO, "Large unary done.");
}

void InteropClient::DoRequestStreaming() {
  gpr_log(GPR_INFO, "Sending request steaming rpc ...");
  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));

  ClientContext context;
  StreamingInputCallRequest request;
  StreamingInputCallResponse response;

  std::unique_ptr<ClientWriter<StreamingInputCallRequest>> stream(
      stub->StreamingInputCall(&context, &response));

  int aggregated_payload_size = 0;
  for (unsigned int i = 0; i < request_stream_sizes.size(); ++i) {
    Payload* payload = request.mutable_payload();
    payload->set_body(grpc::string(request_stream_sizes[i], '\0'));
    GPR_ASSERT(stream->Write(request));
    aggregated_payload_size += request_stream_sizes[i];
  }
  stream->WritesDone();
  Status s = stream->Finish();

  GPR_ASSERT(response.aggregated_payload_size() == aggregated_payload_size);
  AssertOkOrPrintErrorStatus(s);
  gpr_log(GPR_INFO, "Request streaming done.");
}

void InteropClient::DoResponseStreaming() {
  gpr_log(GPR_INFO, "Receiving response steaming rpc ...");
  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));

  ClientContext context;
  StreamingOutputCallRequest request;
  for (unsigned int i = 0; i < response_stream_sizes.size(); ++i) {
    ResponseParameters* response_parameter = request.add_response_parameters();
    response_parameter->set_size(response_stream_sizes[i]);
  }
  StreamingOutputCallResponse response;
  std::unique_ptr<ClientReader<StreamingOutputCallResponse>> stream(
      stub->StreamingOutputCall(&context, request));

  unsigned int i = 0;
  while (stream->Read(&response)) {
    GPR_ASSERT(response.payload().body() ==
               grpc::string(response_stream_sizes[i], '\0'));
    ++i;
  }
  GPR_ASSERT(response_stream_sizes.size() == i);
  Status s = stream->Finish();

  AssertOkOrPrintErrorStatus(s);
  gpr_log(GPR_INFO, "Response streaming done.");
}

void InteropClient::DoResponseStreamingWithSlowConsumer() {
  gpr_log(GPR_INFO, "Receiving response steaming rpc with slow consumer ...");
  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));

  ClientContext context;
  StreamingOutputCallRequest request;

  for (int i = 0; i < kNumResponseMessages; ++i) {
    ResponseParameters* response_parameter = request.add_response_parameters();
    response_parameter->set_size(kResponseMessageSize);
  }
  StreamingOutputCallResponse response;
  std::unique_ptr<ClientReader<StreamingOutputCallResponse>> stream(
      stub->StreamingOutputCall(&context, request));

  int i = 0;
  while (stream->Read(&response)) {
    GPR_ASSERT(response.payload().body() ==
               grpc::string(kResponseMessageSize, '\0'));
    gpr_log(GPR_INFO, "received message %d", i);
    usleep(kReceiveDelayMilliSeconds * 1000);
    ++i;
  }
  GPR_ASSERT(kNumResponseMessages == i);
  Status s = stream->Finish();

  AssertOkOrPrintErrorStatus(s);
  gpr_log(GPR_INFO, "Response streaming done.");
}

void InteropClient::DoHalfDuplex() {
  gpr_log(GPR_INFO, "Sending half-duplex streaming rpc ...");
  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));

  ClientContext context;
  std::unique_ptr<ClientReaderWriter<StreamingOutputCallRequest,
                                     StreamingOutputCallResponse>>
      stream(stub->HalfDuplexCall(&context));

  StreamingOutputCallRequest request;
  ResponseParameters* response_parameter = request.add_response_parameters();
  for (unsigned int i = 0; i < response_stream_sizes.size(); ++i) {
    response_parameter->set_size(response_stream_sizes[i]);
    GPR_ASSERT(stream->Write(request));
  }
  stream->WritesDone();

  unsigned int i = 0;
  StreamingOutputCallResponse response;
  while (stream->Read(&response)) {
    GPR_ASSERT(response.payload().has_body());
    GPR_ASSERT(response.payload().body() ==
               grpc::string(response_stream_sizes[i], '\0'));
    ++i;
  }
  GPR_ASSERT(response_stream_sizes.size() == i);
  Status s = stream->Finish();
  AssertOkOrPrintErrorStatus(s);
  gpr_log(GPR_INFO, "Half-duplex streaming rpc done.");
}

void InteropClient::DoPingPong() {
  gpr_log(GPR_INFO, "Sending Ping Pong streaming rpc ...");
  std::unique_ptr<TestService::Stub> stub(TestService::NewStub(channel_));

  ClientContext context;
  std::unique_ptr<ClientReaderWriter<StreamingOutputCallRequest,
                                     StreamingOutputCallResponse>>
      stream(stub->FullDuplexCall(&context));

  StreamingOutputCallRequest request;
  request.set_response_type(PayloadType::COMPRESSABLE);
  ResponseParameters* response_parameter = request.add_response_parameters();
  Payload* payload = request.mutable_payload();
  StreamingOutputCallResponse response;
  for (unsigned int i = 0; i < request_stream_sizes.size(); ++i) {
    response_parameter->set_size(response_stream_sizes[i]);
    payload->set_body(grpc::string(request_stream_sizes[i], '\0'));
    GPR_ASSERT(stream->Write(request));
    GPR_ASSERT(stream->Read(&response));
    GPR_ASSERT(response.payload().has_body());
    GPR_ASSERT(response.payload().body() ==
               grpc::string(response_stream_sizes[i], '\0'));
  }

  stream->WritesDone();
  GPR_ASSERT(!stream->Read(&response));
  Status s = stream->Finish();
  AssertOkOrPrintErrorStatus(s);
  gpr_log(GPR_INFO, "Ping pong streaming done.");
}

}  // namespace testing
}  // namespace grpc