#ifdef _MSC_VER
#define NOMINMAX
#endif

#include <llarp/service.hpp>
#include "buffer.hpp"
#include "fs.hpp"
#include "ini.hpp"
#include "router.hpp"

namespace llarp
{
  namespace service
  {
    IntroSet::~IntroSet()
    {
      if(W)
        delete W;
    }

    bool
    IntroSet::DecodeKey(llarp_buffer_t key, llarp_buffer_t* buf)
    {
      bool read = false;
      if(!BEncodeMaybeReadDictEntry("a", A, read, key, buf))
        return false;

      if(llarp_buffer_eq(key, "i"))
      {
        return BEncodeReadList(I, buf);
      }

      if(!BEncodeMaybeReadDictEntry("n", topic, read, key, buf))
        return false;

      if(llarp_buffer_eq(key, "w"))
      {
        if(W)
          delete W;
        W = new PoW();
        return W->BDecode(buf);
      }

      if(!BEncodeMaybeReadDictInt("v", version, read, key, buf))
        return false;

      if(!BEncodeMaybeReadDictEntry("z", Z, read, key, buf))
        return false;

      return read;
    }

    bool
    IntroSet::BEncode(llarp_buffer_t* buf) const
    {
      if(!bencode_start_dict(buf))
        return false;
      if(!BEncodeWriteDictEntry("a", A, buf))
        return false;
      // start introduction list
      if(!bencode_write_bytestring(buf, "i", 1))
        return false;
      if(!BEncodeWriteList(I.begin(), I.end(), buf))
        return false;
      // end introduction list

      // topic tag
      if(topic.ToString().size())
      {
        if(!BEncodeWriteDictEntry("n", topic, buf))
          return false;
      }
      // write version
      if(!BEncodeWriteDictInt("v", version, buf))
        return false;
      if(W)
      {
        if(!BEncodeWriteDictEntry("w", *W, buf))
          return false;
      }
      if(!BEncodeWriteDictEntry("z", Z, buf))
        return false;

      return bencode_end(buf);
    }

    bool
    IntroSet::HasExpiredIntros(llarp_time_t now) const
    {
      for(const auto& i : I)
        if(now >= i.expiresAt)
          return true;
      return false;
    }

    bool
    IntroSet::IsExpired(llarp_time_t now) const
    {
      auto highest = now;
      for(const auto& i : I)
        highest = std::max(i.expiresAt, highest);
      return highest == now;
    }

    Introduction::~Introduction()
    {
    }

    bool
    Introduction::DecodeKey(llarp_buffer_t key, llarp_buffer_t* buf)
    {
      bool read = false;
      if(!BEncodeMaybeReadDictEntry("k", router, read, key, buf))
        return false;
      if(!BEncodeMaybeReadDictInt("l", latency, read, key, buf))
        return false;
      if(!BEncodeMaybeReadDictEntry("p", pathID, read, key, buf))
        return false;
      if(!BEncodeMaybeReadDictInt("v", version, read, key, buf))
        return false;
      if(!BEncodeMaybeReadDictInt("x", expiresAt, read, key, buf))
        return false;
      return read;
    }

    bool
    Introduction::BEncode(llarp_buffer_t* buf) const
    {
      if(!bencode_start_dict(buf))
        return false;

      if(!BEncodeWriteDictEntry("k", router, buf))
        return false;
      if(latency)
      {
        if(!BEncodeWriteDictInt("l", latency, buf))
          return false;
      }
      if(!BEncodeWriteDictEntry("p", pathID, buf))
        return false;
      if(!BEncodeWriteDictInt("v", version, buf))
        return false;
      if(!BEncodeWriteDictInt("x", expiresAt, buf))
        return false;
      return bencode_end(buf);
    }

    void
    Introduction::Clear()
    {
      router.Zero();
      pathID.Zero();
      latency   = 0;
      expiresAt = 0;
    }

    Identity::~Identity()
    {
    }

    bool
    Identity::BEncode(llarp_buffer_t* buf) const
    {
      /// TODO: implement me
      if(!bencode_start_dict(buf))
        return false;
      if(!BEncodeWriteDictEntry("e", enckey, buf))
        return false;
      if(!BEncodeWriteDictEntry("s", signkey, buf))
        return false;
      if(!BEncodeWriteDictInt("v", version, buf))
        return false;
      if(!BEncodeWriteDictEntry("x", vanity, buf))
        return false;
      return bencode_end(buf);
    }

    bool
    Identity::DecodeKey(llarp_buffer_t key, llarp_buffer_t* buf)
    {
      bool read = false;
      if(!BEncodeMaybeReadDictEntry("e", enckey, read, key, buf))
        return false;
      if(!BEncodeMaybeReadDictEntry("s", signkey, read, key, buf))
        return false;
      if(!BEncodeMaybeReadDictInt("v", version, read, key, buf))
        return false;
      if(!BEncodeMaybeReadDictEntry("x", vanity, read, key, buf))
        return false;
      return read;
    }

    void
    Identity::RegenerateKeys(llarp_crypto* crypto)
    {
      crypto->encryption_keygen(enckey);
      crypto->identity_keygen(signkey);
      pub.enckey  = llarp::seckey_topublic(enckey);
      pub.signkey = llarp::seckey_topublic(signkey);
      pub.vanity.Zero();
      pub.UpdateAddr();
    }

    bool
    Identity::EnsureKeys(const std::string& fname, llarp_crypto* c)
    {
      byte_t tmp[256];
      auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
      std::error_code ec;
      // check for file
      if(!fs::exists(fname, ec))
      {
        if(ec)
        {
          llarp::LogError(ec);
          return false;
        }
        // regen and encode
        RegenerateKeys(c);
        if(!BEncode(&buf))
          return false;
        // rewind
        buf.sz  = buf.cur - buf.base;
        buf.cur = buf.base;
        // write
        std::ofstream f;
        f.open(fname, std::ios::binary);
        if(!f.is_open())
          return false;
        f.write((char*)buf.cur, buf.sz);
      }
      // read file
      std::ifstream inf(fname, std::ios::binary);
      inf.seekg(0, std::ios::end);
      size_t sz = inf.tellg();
      inf.seekg(0, std::ios::beg);

      if(sz > sizeof(tmp))
        return false;
      // decode
      inf.read((char*)buf.base, sz);
      return BDecode(&buf);
    }

    bool
    Identity::SignIntroSet(IntroSet& i, llarp_crypto* crypto) const
    {
      if(i.I.size() == 0)
        return false;
      i.A = pub;
      // zero out signature for signing process
      i.Z.Zero();
      byte_t tmp[MAX_INTROSET_SIZE];
      auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
      if(!i.BEncode(&buf))
        return false;
      // rewind and resize buffer
      buf.sz  = buf.cur - buf.base;
      buf.cur = buf.base;
      return crypto->sign(i.Z, signkey, buf);
    }

    bool
    IntroSet::VerifySignature(llarp_crypto* crypto) const
    {
      byte_t tmp[MAX_INTROSET_SIZE];
      auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
      IntroSet copy;
      copy = *this;
      copy.Z.Zero();
      if(!copy.BEncode(&buf))
        return false;
      // rewind and resize buffer
      buf.sz  = buf.cur - buf.base;
      buf.cur = buf.base;
      return crypto->verify(A.signkey, buf, Z);
    }

    bool
    Config::Load(const std::string& fname)
    {
      ini::Parser parser(fname);
      for(const auto& sec : parser.top().ordered_sections)
      {
        services.push_back({sec->first, sec->second.values});
      }
      return services.size() > 0;
    }

  }  // namespace service
}  // namespace llarp