/*
  otp/pdu.h

  Copyright (c) 2021 Kevin Matz (kevin.matz@gmail.com)

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
#pragma once

#include "acn/pdu-stream.h"

#include <vector>

namespace OTP {
namespace PDU {

using ACN::PDU::Stream;
using ACN::PDU::pdu_stream_object;

/**
 * @brief The pdu_data struct
 */
struct pdu_data : public pdu_stream_object {};


class pdu;
using Pdu = std::shared_ptr<pdu>;


template<class T>
struct Block
    : public pdu_data
{
  Block() {
    static_assert(std::is_base_of<OTP::PDU::pdu, T>::value,
        "type parameter of ACN::PDU::Block must derive from OTP::PDU::Pdu");
  }
  std::shared_ptr<std::vector<std::shared_ptr<T>>> members
                             = std::shared_ptr<std::vector<std::shared_ptr<T>>>
                                          (new std::vector<std::shared_ptr<T>>);
  void setParent(Pdu parent) {
    for (auto &p : *members)
      p->parent = parent;
  }
  size_t streamSize() const override {
    size_t s = 0;
    for (auto &p : *members)
      s += p->streamSize();
    return s;
  }
  void iStream(Stream s) override {
    while(s->good()) {
        std::shared_ptr<T> p(new T());
        p->iStream(s);
        if (s->fail())              // stream failed during pdu read
          break;
        if (p->stream()->fail())    // pdu buffer failed
          continue;
        members->push_back(p);      // add to block
      }
  }
  void oStream(Stream s) const override {
    for ( const auto& p : *members )
      p->oStream(s);
  };
};


/**
 * @brief The OTP::PDU::Pdu class
 */
class pdu
    : public std::enable_shared_from_this<pdu>
    , public pdu_data
{
public:
  pdu();
  ~pdu();

  pdu_data* data = nullptr;
  uint16_t  vector = 0;
  Pdu       parent;

  Stream    stream() { return stream_; }
  virtual size_t streamSize() const override;
  virtual void iStream(Stream) override;
  virtual void oStream(Stream) const override;

  template<class T>
  void createData()
  {
    data = new T();
    if (stream_ && stream_->good())
      data->iStream(stream_);
  }
  template<class T>
  void createDataBlock() {
    auto block = new PDU::Block<T>();
    if (stream_)
        block->iStream(stream_);
    block->setParent(shared_from_this());
    data = block;
  }

private:
  Stream stream_;
};


} // namespace PDU
} // namespace OTP