#include <config/config.hpp>  // for ensure_config
#include <constants/version.hpp>
#include <llarp.hpp>
#include <util/lokinet_init.h>
#include <util/fs.hpp>
#include <util/logging/logger.hpp>
#include <util/logging/ostream_logger.hpp>

#include <csignal>

#include <cxxopts.hpp>
#include <string>
#include <iostream>
#include <future>

#ifdef _WIN32
#define wmin(x, y) (((x) < (y)) ? (x) : (y))
#define MIN wmin
extern "C" LONG FAR PASCAL
win32_signal_handler(EXCEPTION_POINTERS*);
#endif

struct llarp_main* ctx = 0;
std::promise<int> exit_code;

void
handle_signal(int sig)
{
  if (ctx)
  {
    llarp_main_signal(ctx, sig);
  }
}

#ifdef _WIN32
int
startWinsock()
{
  WSADATA wsockd;
  int err;
  err = ::WSAStartup(MAKEWORD(2, 2), &wsockd);
  if (err)
  {
    perror("Failed to start Windows Sockets");
    return err;
  }
  ::CreateMutex(nullptr, FALSE, "lokinet_win32_daemon");
  return 0;
}

extern "C" BOOL FAR PASCAL
handle_signal_win32(DWORD fdwCtrlType)
{
  UNREFERENCED_PARAMETER(fdwCtrlType);
  handle_signal(SIGINT);
  return TRUE;  // probably unreachable
}
#endif

/// this sets up, configures and runs the main context
static void
run_main_context(std::string conffname, llarp_main_runtime_opts opts)
{
  // this is important, can downgrade from Info though
  llarp::LogDebug("Running from: ", fs::current_path().string());
  llarp::LogInfo("Using config file: ", conffname);
  ctx = llarp_main_init(conffname.c_str());
  int code = 1;
  if (ctx)
  {
    signal(SIGINT, handle_signal);
    signal(SIGTERM, handle_signal);
#ifndef _WIN32
    signal(SIGHUP, handle_signal);
#endif
    code = llarp_main_setup(ctx);
    llarp::util::SetThreadName("llarp-mainloop");
    if (code == 0)
      code = llarp_main_run(ctx, opts);
  }
  exit_code.set_value(code);
}

int
main(int argc, char* argv[])
{
  auto result = Lokinet_INIT();
  if (result)
  {
    return result;
  }
  llarp_main_runtime_opts opts;
  const char* singleThreadVar = getenv("LLARP_SHADOW");
  if (singleThreadVar && std::string(singleThreadVar) == "1")
  {
    opts.singleThreaded = true;
  }

#ifdef _WIN32
  if (startWinsock())
    return -1;
  SetConsoleCtrlHandler(handle_signal_win32, TRUE);
  // SetUnhandledExceptionFilter(win32_signal_handler);
#endif

  cxxopts::Options options(
      "lokinet",
      "LokiNET is a free, open source, private, "
      "decentralized, \"market based sybil resistant\" "
      "and IP based onion routing network");
  options.add_options()("v,verbose", "Verbose", cxxopts::value<bool>())(
      "h,help", "help", cxxopts::value<bool>())("version", "version", cxxopts::value<bool>())(
      "g,generate", "generate client config", cxxopts::value<bool>())(
      "r,router", "generate router config", cxxopts::value<bool>())(
      "f,force", "overwrite", cxxopts::value<bool>())(
      "c,colour", "colour output", cxxopts::value<bool>()->default_value("true"))(
      "b,background",
      "background mode (start, but do not connect to the network)",
      cxxopts::value<bool>())(
      "config", "path to configuration file", cxxopts::value<std::string>());

  options.parse_positional("config");

  bool genconfigOnly = false;
  bool asRouter = false;
  bool overWrite = false;
  std::string conffname;
  try
  {
    auto result = options.parse(argc, argv);

    if (result.count("verbose") > 0)
    {
      SetLogLevel(llarp::eLogDebug);
      llarp::LogDebug("debug logging activated");
    }

    if (!result["colour"].as<bool>())
    {
      llarp::LogContext::Instance().logStream =
          std::make_unique<llarp::OStreamLogStream>(false, std::cerr);
    }

    if (result.count("help"))
    {
      std::cout << options.help() << std::endl;
      return 0;
    }

    if (result.count("version"))
    {
      std::cout << llarp_version() << std::endl;
      return 0;
    }

    if (result.count("generate") > 0)
    {
      genconfigOnly = true;
    }

    if (result.count("background") > 0)
    {
      opts.background = true;
    }

    if (result.count("force") > 0)
    {
      overWrite = true;
    }

    if (result.count("router") > 0)
    {
      asRouter = true;
      // we should generate and exit (docker needs this, so we don't write a
      // config each time on startup)
      genconfigOnly = true;
    }

    if (result.count("config") > 0)
    {
      auto arg = result["config"].as<std::string>();
      if (!arg.empty())
      {
        conffname = arg;
      }
    }
  }
  catch (const cxxopts::option_not_exists_exception& ex)
  {
    std::cerr << ex.what();
    std::cout << options.help() << std::endl;
    return 1;
  }

  if (!conffname.empty())
  {
    // when we have an explicit filepath
    fs::path fname = fs::path(conffname);
    fs::path basedir = fname.parent_path();

    if (!basedir.empty())
    {
      std::error_code ec;
      if (!fs::create_directories(basedir, ec))
      {
        if (ec)
        {
          llarp::LogError("failed to create '", basedir.string(), "': ", ec.message());
          return 1;
        }
      }
    }

    if (genconfigOnly)
    {
      if (!llarp_ensure_config(conffname.c_str(), basedir.string().c_str(), overWrite, asRouter))
        return 1;
    }
    else
    {
      std::error_code ec;
      if (!fs::exists(fname, ec))
      {
        llarp::LogError("Config file not found ", conffname);
        return 1;
      }
    }
  }
  else
  {
    auto basepath = llarp::GetDefaultConfigDir();

    llarp::LogDebug("Find or create ", basepath.string());
    std::error_code ec;
    // These paths are guaranteed to exist - $APPDATA or $HOME
    // so only create .lokinet/*
    if (!fs::create_directory(basepath, ec))
    {
      if (ec)
      {
        llarp::LogError("failed to create '", basepath.string(), "': ", ec.message());
        return 1;
      }
    }

    auto fpath = llarp::GetDefaultConfigPath();

    // if using default INI file, we're create it even if you don't ask us too
    if (!llarp_ensure_config(
            fpath.string().c_str(), basepath.string().c_str(), overWrite, asRouter))
      return 1;
    conffname = fpath.string();
  }

  if (genconfigOnly)
  {
    return 0;
  }

  std::thread main_thread{std::bind(&run_main_context, conffname, opts)};
  auto ftr = exit_code.get_future();
  do
  {
    // do periodic non lokinet related tasks here
    if (ctx != nullptr)
    {
      auto ctx_pp = llarp::Context::Get(ctx);
      if (ctx_pp != nullptr)
      {
        if (ctx_pp->IsUp() and not ctx_pp->LooksAlive())
        {
          for (const auto& wtf : {"you have been visited by the mascott of the "
                                  "deadlocked router.",
                                  "⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣀⣴⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣄⠄⠄⠄⠄",
                                  "⠄⠄⠄⠄⠄⢀⣀⣀⡀⠄⠄⠄⡠⢲⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⡀⠄⠄",
                                  "⠄⠄⠄⠔⣈⣀⠄⢔⡒⠳⡴⠊⠄⠸⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠿⣿⣿⣧⠄⠄",
                                  "⠄⢜⡴⢑⠖⠊⢐⣤⠞⣩⡇⠄⠄⠄⠙⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣆⠄⠝⠛⠋⠐",
                                  "⢸⠏⣷⠈⠄⣱⠃⠄⢠⠃⠐⡀⠄⠄⠄⠄⠙⠻⢿⣿⣿⣿⣿⣿⣿⣿⡿⠛⠸⠄⠄⠄⠄",
                                  "⠈⣅⠞⢁⣿⢸⠘⡄⡆⠄⠄⠈⠢⡀⠄⠄⠄⠄⠄⠄⠉⠙⠛⠛⠛⠉⠉⡀⠄⠡⢀⠄⣀",
                                  "⠄⠙⡎⣹⢸⠄⠆⢘⠁⠄⠄⠄⢸⠈⠢⢄⡀⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠃⠄⠄⠄⠄⠄",
                                  "⠄⠄⠑⢿⠈⢆⠘⢼⠄⠄⠄⠄⠸⢐⢾⠄⡘⡏⠲⠆⠠⣤⢤⢤⡤⠄⣖⡇⠄⠄⠄⠄⠄",
                                  "⣴⣶⣿⣿⣣⣈⣢⣸⠄⠄⠄⠄⡾⣷⣾⣮⣤⡏⠁⠘⠊⢠⣷⣾⡛⡟⠈⠄⠄⠄⠄⠄⠄",
                                  "⣿⣿⣿⣿⣿⠉⠒⢽⠄⠄⠄⠄⡇⣿⣟⣿⡇⠄⠄⠄⠄⢸⣻⡿⡇⡇⠄⠄⠄⠄⠄⠄⠄",
                                  "⠻⣿⣿⣿⣿⣄⠰⢼⠄⠄⠄⡄⠁⢻⣍⣯⠃⠄⠄⠄⠄⠈⢿⣻⠃⠈⡆⡄⠄⠄⠄⠄⠄",
                                  "⠄⠙⠿⠿⠛⣿⣶⣤⡇⠄⠄⢣⠄⠄⠈⠄⢠⠂⠄⠁⠄⡀⠄⠄⣀⠔⢁⠃⠄⠄⠄⠄⠄",
                                  "⠄⠄⠄⠄⠄⣿⣿⣿⣿⣾⠢⣖⣶⣦⣤⣤⣬⣤⣤⣤⣴⣶⣶⡏⠠⢃⠌⠄⠄⠄⠄⠄⠄",
                                  "⠄⠄⠄⠄⠄⠿⠿⠟⠛⡹⠉⠛⠛⠿⠿⣿⣿⣿⣿⣿⡿⠂⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄",
                                  "⠠⠤⠤⠄⠄⣀⠄⠄⠄⠑⠠⣤⣀⣀⣀⡘⣿⠿⠙⠻⡍⢀⡈⠂⠄⠄⠄⠄⠄⠄⠄⠄⠄",
                                  "⠄⠄⠄⠄⠄⠄⠑⠠⣠⣴⣾⣿⣿⣿⣿⣿⣿⣇⠉⠄⠻⣿⣷⣄⡀⠄⠄⠄⠄⠄⠄⠄⠄",
                                  "file a bug report now or be cursed with this "
                                  "annoying image in your syslog for all time."})
          {
            LogError(wtf);
          }
          std::abort();
        }
      }
    }
  } while (ftr.wait_for(std::chrono::seconds(1)) != std::future_status::ready);

  main_thread.join();
  const auto code = ftr.get();
#ifdef _WIN32
  ::WSACleanup();
#endif
  if (ctx)
  {
    llarp_main_free(ctx);
  }
  return code;
}