//
//
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//

#include <grpc/grpc.h>
#include <grpc/status.h>
#include <grpcpp/channel.h>
#include <grpcpp/create_channel.h>
#include <grpcpp/impl/grpc_library.h>
#include <grpcpp/security/credentials.h>
#include <grpcpp/support/channel_arguments.h>
#include <grpcpp/support/client_interceptor.h>
#include <grpcpp/support/config.h>
#include <grpcpp/virtual_channel.h>

#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "src/core/client_channel/virtual_channel.h"
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/cpp/client/create_channel_internal.h"
#include "absl/functional/any_invocable.h"

namespace grpc {
std::shared_ptr<grpc::Channel> CreateChannel(
    const grpc::string& target,
    const std::shared_ptr<grpc::ChannelCredentials>& creds) {
  return CreateCustomChannel(target, creds, grpc::ChannelArguments());
}

std::shared_ptr<grpc::Channel> CreateCustomChannel(
    const grpc::string& target,
    const std::shared_ptr<grpc::ChannelCredentials>& creds,
    const grpc::ChannelArguments& args) {
  grpc::internal::GrpcLibrary
      init_lib;  // We need to call init in case of bad creds.
  return creds ? creds->CreateChannelImpl(target, args)
               : grpc::CreateChannelInternal(
                     "",
                     grpc_lame_client_channel_create(
                         nullptr, GRPC_STATUS_INVALID_ARGUMENT,
                         "Invalid credentials."),
                     std::vector<std::unique_ptr<
                         grpc::experimental::
                             ClientInterceptorFactoryInterface>>());
}

namespace experimental {
std::shared_ptr<grpc::Channel> CreateVirtualChannel(grpc::internal::Call call) {
  return CreateVirtualChannel(call, grpc::ChannelArguments());
}

std::shared_ptr<grpc::Channel> CreateVirtualChannel(
    grpc::internal::Call call, const grpc::ChannelArguments& args,
    absl::AnyInvocable<void()> goaway_callback) {
  grpc_core::ExecCtx exec_ctx;
  grpc_core::ChannelArgs core_args =
      grpc_core::ChannelArgs::FromC(args.c_channel_args());

  auto core_channel = grpc_core::VirtualChannel::Create(
      call.call(), core_args, std::move(goaway_callback));
  GRPC_CHECK(core_channel.ok());

  return grpc::CreateChannelInternal(
      "", core_channel->release()->c_ptr(),
      std::vector<std::unique_ptr<
          grpc::experimental::ClientInterceptorFactoryInterface>>());
}

/// Create a new \em custom \a Channel pointing to \a target with \a
/// interceptors being invoked per call.
///
/// \warning For advanced use and testing ONLY. Override default channel
/// arguments only if necessary.
///
/// \param target The URI of the endpoint to connect to.
/// \param creds Credentials to use for the created channel. If it does not
/// hold an object or is invalid, a lame channel (one on which all operations
/// fail) is returned.
/// \param args Options for channel creation.
std::shared_ptr<grpc::Channel> CreateCustomChannelWithInterceptors(
    const std::string& target,
    const std::shared_ptr<grpc::ChannelCredentials>& creds,
    const grpc::ChannelArguments& args,
    std::vector<
        std::unique_ptr<grpc::experimental::ClientInterceptorFactoryInterface>>
        interceptor_creators) {
  grpc::internal::GrpcLibrary
      init_lib;  // We need to call init in case of bad creds.
  return creds ? creds->CreateChannelWithInterceptors(
                     target, args, std::move(interceptor_creators))
               : grpc::CreateChannelInternal(
                     "",
                     grpc_lame_client_channel_create(
                         nullptr, GRPC_STATUS_INVALID_ARGUMENT,
                         "Invalid credentials."),
                     std::move(interceptor_creators));
}
}  // namespace experimental

}  // namespace grpc
