/*
 *
 * Copyright 2014, Google Inc.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#include "src/cpp/client/channel.h"

#include <chrono>
#include <memory>

#include <grpc/grpc.h>
#include <grpc/grpc_security.h>
#include <grpc/support/log.h>
#include <grpc/support/slice.h>

#include "src/cpp/proto/proto_utils.h"
#include <grpc++/channel_arguments.h>
#include <grpc++/client_context.h>
#include <grpc++/completion_queue.h>
#include <grpc++/config.h>
#include <grpc++/credentials.h>
#include <grpc++/impl/call.h>
#include <grpc++/impl/rpc_method.h>
#include <grpc++/status.h>
#include <google/protobuf/message.h>

namespace grpc {

Channel::Channel(const grpc::string &target, const ChannelArguments &args)
    : target_(target) {
  grpc_channel_args channel_args;
  args.SetChannelArgs(&channel_args);
  c_channel_ = grpc_channel_create(
      target_.c_str(), channel_args.num_args > 0 ? &channel_args : nullptr);
}

Channel::Channel(const grpc::string &target,
                 const std::unique_ptr<Credentials> &creds,
                 const ChannelArguments &args)
    : target_(args.GetSslTargetNameOverride().empty()
                  ? target
                  : args.GetSslTargetNameOverride()) {
  grpc_channel_args channel_args;
  args.SetChannelArgs(&channel_args);
  grpc_credentials *c_creds = creds ? creds->GetRawCreds() : nullptr;
  c_channel_ = grpc_secure_channel_create(
      c_creds, target.c_str(),
      channel_args.num_args > 0 ? &channel_args : nullptr);
}

Channel::~Channel() { grpc_channel_destroy(c_channel_); }

Call Channel::CreateCall(const RpcMethod &method, ClientContext *context,
                         CompletionQueue *cq) {
  auto c_call =
      grpc_channel_create_call(
          c_channel_, cq->cq(), method.name(),
          context->authority().empty() ? target_.c_str()
                                       : context->authority().c_str(),
          context->RawDeadline());
  context->set_call(c_call);
  return Call(c_call, this, cq);
}

void Channel::PerformOpsOnCall(CallOpBuffer *buf, Call *call) {
  static const size_t MAX_OPS = 8;
  size_t nops = MAX_OPS;
  grpc_op ops[MAX_OPS];
  buf->FillOps(ops, &nops);
  GPR_ASSERT(GRPC_CALL_OK ==
             grpc_call_start_batch(call->call(), ops, nops, buf));
}

}  // namespace grpc