// Copyright (c) Facebook, Inc. and its affiliates.
//
// 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 "rsocket/statemachine/StreamFragmentAccumulator.h"

namespace rsocket {

StreamFragmentAccumulator::StreamFragmentAccumulator()
    : flagsComplete(false), flagsNext(false) {}

void StreamFragmentAccumulator::addPayloadIgnoreFlags(Payload p) {
  if (p.metadata) {
    if (!fragments.metadata) {
      fragments.metadata = std::move(p.metadata);
    } else {
      fragments.metadata->prev()->appendChain(std::move(p.metadata));
    }
  }

  if (p.data) {
    if (!fragments.data) {
      fragments.data = std::move(p.data);
    } else {
      fragments.data->prev()->appendChain(std::move(p.data));
    }
  }
}

void StreamFragmentAccumulator::addPayload(
    Payload p,
    bool next,
    bool complete) {
  flagsNext |= next;
  flagsComplete |= complete;
  addPayloadIgnoreFlags(std::move(p));
}

Payload StreamFragmentAccumulator::consumePayloadIgnoreFlags() {
  flagsComplete = false;
  flagsNext = false;
  return std::move(fragments);
}

std::tuple<Payload, bool, bool>
StreamFragmentAccumulator::consumePayloadAndFlags() {
  auto ret = std::make_tuple(
      std::move(fragments), bool(flagsNext), bool(flagsComplete));
  flagsComplete = false;
  flagsNext = false;
  return ret;
}

} /* namespace rsocket */