#include "router_version.hpp"

#include <cassert>

namespace llarp
{
  RouterVersion::RouterVersion(const Version_t& router, uint64_t proto)
      : m_Version(router), m_ProtoVersion(proto)
  {}

  bool
  RouterVersion::IsCompatableWith(const RouterVersion& other) const
  {
    return m_ProtoVersion == other.m_ProtoVersion;
  }

  std::string
  RouterVersion::bt_encode() const
  {
    oxenc::bt_list_producer btlp;

    try
    {
      btlp.append(m_ProtoVersion);

      for (auto& v : m_Version)
        btlp.append(v);
    }
    catch (...)
    {
      log::critical(llarp_cat, "Error: RouterVersion failed to bt encode contents!");
    }

    return std::move(btlp).str();
  }

  void
  RouterVersion::Clear()
  {
    m_Version.fill(0);
    m_ProtoVersion = INVALID_VERSION;
    assert(IsEmpty());
  }

  bool
  RouterVersion::IsEmpty() const
  {
    return *this == emptyRouterVersion;
  }

  bool
  RouterVersion::BDecode(llarp_buffer_t* buf)
  {
    // clear before hand
    Clear();
    size_t idx = 0;
    if (not bencode_read_list(
            [this, &idx](llarp_buffer_t* buffer, bool has) {
              if (has)
              {
                uint64_t i;
                if (idx == 0)
                {
                  uint64_t val = -1;
                  if (not bencode_read_integer(buffer, &val))
                    return false;
                  m_ProtoVersion = val;
                }
                else if (bencode_read_integer(buffer, &i))
                {
                  // prevent overflow (note that idx includes version too)
                  if (idx > m_Version.max_size())
                    return false;
                  m_Version[idx - 1] = i;
                }
                else
                  return false;
                ++idx;
              }
              return true;
            },
            buf))
      return false;
    // either full list or empty list is valid
    return idx == 4 || idx == 0;
  }

  std::string
  RouterVersion::ToString() const
  {
    return std::to_string(m_Version.at(0)) + "." + std::to_string(m_Version.at(1)) + "."
        + std::to_string(m_Version.at(2)) + " protocol version " + std::to_string(m_ProtoVersion);
  }

}  // namespace llarp