#include <getopt.h>
#include <llarp.h>
#include <signal.h>
#include "logger.hpp"

#include <llarp/router_contact.hpp>
#include <llarp/time.h>

#include <fstream>
#include "buffer.hpp"
#include "crypto.hpp"
#include "fs.hpp"
#include "llarp/net.hpp"
#include "router.hpp"

struct llarp_main *ctx = 0;

llarp_main *sllarp = nullptr;

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

#ifndef TESTNET
#define TESTNET 0
#endif

void
displayRC(const llarp::RouterContact &rc)
{
  std::cout << rc.pubkey << std::endl;
  for(const auto &addr : rc.addrs)
  {
    std::cout << "AddressInfo: " << addr << std::endl;
  }
}

// fwd declr
struct check_online_request;

/*
void
HandleDHTLocate(llarp_router_lookup_job *job)
{
  llarp::LogInfo("DHT result: ", job->found ? "found" : "not found");
  if(job->found)
  {
    // save to nodedb?
    displayRC(&job->result);
  }
  // shutdown router

  // well because we're in the gotroutermessage, we can't sigint because we'll
  // deadlock because we're session locked
  // llarp_main_signal(ctx, SIGINT);

  // llarp_timer_run(logic->timer, logic->thread);
  // we'll we don't want logic thread
  // but we want to switch back to the main thread
  // llarp_logic_stop();
  // still need to exit this logic thread...
  llarp_main_abort(ctx);
}
*/

int
main(int argc, char *argv[])
{
  // take -c to set location of daemon.ini
  // take -o to set log level
  // --generate-blank /path/to/file.signed
  // --update-ifs /path/to/file.signed
  // --key /path/to/long_term_identity.key
  // --import
  // --export

  // --generate /path/to/file.signed
  // --update /path/to/file.signed
  // --verify /path/to/file.signed
  // printf("has [%d]options\n", argc);
  if(argc < 2)
  {
    printf(
        "please specify: \n"
        "--generate  with a path to a router contact file\n"
        "--update    with a path to a router contact file\n"
        "--list      path to nodedb skiplist\n"
        "--import    with a path to a router contact file\n"
        "--export    a hex formatted public key\n"
        "--locate    a hex formatted public key"
        "--localInfo \n"
        "--read      with a path to a router contact file\n"
        "--verify    with a path to a router contact file\n"
        "\n");
    return 0;
  }
  bool genMode    = false;
  bool updMode    = false;
  bool listMode   = false;
  bool importMode = false;
  bool exportMode = false;
  bool locateMode = false;
  bool localMode  = false;
  bool verifyMode = false;
  bool readMode   = false;
  int c;
  char *conffname;
  char defaultConfName[] = "daemon.ini";
  conffname              = defaultConfName;
  char *rcfname          = nullptr;
  char *nodesdir         = nullptr;

  llarp::RouterContact rc;
  while(1)
  {
    static struct option long_options[] = {
        {"file", required_argument, 0, 'f'},
        {"config", required_argument, 0, 'c'},
        {"logLevel", required_argument, 0, 'o'},
        {"generate", required_argument, 0, 'g'},
        {"update", required_argument, 0, 'u'},
        {"list", required_argument, 0, 'l'},
        {"import", required_argument, 0, 'i'},
        {"export", required_argument, 0, 'e'},
        {"locate", required_argument, 0, 'q'},
        {"localInfo", no_argument, 0, 'n'},
        {"read", required_argument, 0, 'r'},
        {"verify", required_argument, 0, 'V'},
        {0, 0, 0, 0}};
    int option_index = 0;
    c = getopt_long(argc, argv, "f:c:o:g:lu:i:e:q:nr:V:", long_options,
                    &option_index);
#define MIN(X, Y) (((X) < (Y)) ? (X) : (Y))
    if(c == -1)
      break;
    switch(c)
    {
      case 0:
        break;
      case 'c':
        conffname = optarg;
        break;
      case 'o':
        if(strncmp(optarg, "debug",
                   MIN(strlen(optarg), static_cast< unsigned long >(5)))
           == 0)
        {
          llarp::SetLogLevel(llarp::eLogDebug);
        }
        else if(strncmp(optarg, "info",
                        MIN(strlen(optarg), static_cast< unsigned long >(4)))
                == 0)
        {
          llarp::SetLogLevel(llarp::eLogInfo);
        }
        else if(strncmp(optarg, "warn",
                        MIN(strlen(optarg), static_cast< unsigned long >(4)))
                == 0)
        {
          llarp::SetLogLevel(llarp::eLogWarn);
        }
        else if(strncmp(optarg, "error",
                        MIN(strlen(optarg), static_cast< unsigned long >(5)))
                == 0)
        {
          llarp::SetLogLevel(llarp::eLogError);
        }
        break;
      case 'V':
        rcfname    = optarg;
        verifyMode = true;
        break;
      case 'f':
        rcfname = optarg;
        break;
      case 'l':
        nodesdir = optarg;
        listMode = true;
        break;
      case 'i':
        // printf ("option -g with value `%s'\n", optarg);
        nodesdir   = optarg;
        importMode = true;
        break;
      case 'e':
        // printf ("option -g with value `%s'\n", optarg);
        rcfname    = optarg;
        exportMode = true;
        break;
      case 'q':
        // printf ("option -g with value `%s'\n", optarg);
        rcfname    = optarg;
        locateMode = true;
        break;
      case 'g':
        // printf ("option -g with value `%s'\n", optarg);
        rcfname = optarg;
        genMode = true;
        break;
      case 'u':
        // printf ("option -u with value `%s'\n", optarg);
        rcfname = optarg;
        updMode = true;
        break;
      case 'n':
        localMode = true;
        break;
      case 'r':
        rcfname  = optarg;
        readMode = true;
        break;
      default:
        printf("Bad option: %c\n", c);
        return -1;
    }
  }
#undef MIN
  if(verifyMode)
  {
    llarp_crypto crypto;
    llarp_crypto_libsodium_init(&crypto);
    if(!rc.Read(rcfname))
    {
      std::cout << "failed to read " << rcfname << std::endl;
      return 1;
    }
    if(!rc.VerifySignature(&crypto))
    {
      std::cout << rcfname << " has invalid signature" << std::endl;
      return 1;
    }
    if(!rc.IsPublicRouter())
    {
      std::cout << rcfname << " is not a public router";
      if(rc.addrs.size() == 0)
      {
        std::cout << " because it has no public addresses";
      }
      std::cout << std::endl;
      return 1;
    }

    std::cout << "router identity and dht routing key: " << rc.pubkey
              << std::endl;

    std::cout << "router encryption key: " << rc.enckey << std::endl;

    if(rc.HasNick())
      std::cout << "router nickname: " << rc.Nick() << std::endl;

    std::cout << "advertised addresses: " << std::endl;
    for(const auto &addr : rc.addrs)
    {
      std::cout << addr << std::endl;
    }
    std::cout << std::endl;

    std::cout << "advertised exits: ";
    if(rc.exits.size())
    {
      for(const auto &exit : rc.exits)
      {
        std::cout << exit << std::endl;
      }
    }
    else
    {
      std::cout << "none";
    }
    std::cout << std::endl;
    return 0;
  }

  if(listMode)
  {
    llarp_crypto crypto;
    llarp_crypto_libsodium_init(&crypto);
    auto nodedb = llarp_nodedb_new(&crypto);
    llarp_nodedb_iter itr;
    itr.visit = [](llarp_nodedb_iter *i) -> bool {
      std::cout << i->rc->pubkey << std::endl;
      return true;
    };
    if(llarp_nodedb_load_dir(nodedb, nodesdir) > 0)
      llarp_nodedb_iterate_all(nodedb, itr);
    llarp_nodedb_free(&nodedb);
    return 0;
  }

  if(importMode)
  {
    if(rcfname == nullptr)
    {
      std::cout << "no file to import" << std::endl;
      return 1;
    }
    llarp_crypto crypto;
    llarp_crypto_libsodium_init(&crypto);
    auto nodedb = llarp_nodedb_new(&crypto);
    if(!llarp_nodedb_ensure_dir(nodesdir))
    {
      std::cout << "failed to ensure " << nodesdir << strerror(errno)
                << std::endl;
      return 1;
    }
    llarp_nodedb_set_dir(nodedb, nodesdir);
    if(!rc.Read(rcfname))
    {
      std::cout << "failed to read " << rcfname << " " << strerror(errno)
                << std::endl;
      return 1;
    }

    if(!rc.VerifySignature(&crypto))
    {
      std::cout << rcfname << " has invalid signature" << std::endl;
      return 1;
    }

    if(!llarp_nodedb_put_rc(nodedb, rc))
    {
      std::cout << "failed to store " << strerror(errno) << std::endl;
      return 1;
    }

    std::cout << "imported " << rc.pubkey << std::endl;

    return 0;
  }

  if(!genMode && !updMode && !listMode && !importMode && !exportMode
     && !locateMode && !localMode && !readMode)
  {
    llarp::LogError(
        "I don't know what to do, no generate or update parameter\n");
    return 0;
  }

  ctx = llarp_main_init(conffname, !TESTNET);
  if(!ctx)
  {
    llarp::LogError("Cant set up context");
    return 0;
  }
  signal(SIGINT, handle_signal);
  if(genMode)
  {
    printf("Creating [%s]\n", rcfname);
    // if we zero it out then
    // set updated timestamp
    rc.last_updated = llarp_time_now_ms();
    // load longterm identity
    llarp_crypto crypt;
    llarp_crypto_libsodium_init(&crypt);

    // which is in daemon.ini config: router.encryption-privkey (defaults
    // "encryption.key")
    fs::path encryption_keyfile = "encryption.key";
    llarp::SecretKey encryption;

    llarp_findOrCreateEncryption(&crypt, encryption_keyfile.string().c_str(),
                                 encryption);

    rc.enckey = llarp::seckey_topublic(encryption);

    // get identity public sig key
    fs::path ident_keyfile = "identity.key";
    llarp::SecretKey identity;
    llarp_findOrCreateIdentity(&crypt, ident_keyfile.string().c_str(),
                               identity);

    rc.pubkey = llarp::seckey_topublic(identity);

    // this causes a segfault
    if(!rc.Sign(&crypt, identity))
    {
      std::cout << "failed to sign" << std::endl;
      return 1;
    }
    // set filename
    fs::path our_rc_file = rcfname;
    // write file
    rc.Write(our_rc_file.string().c_str());
  }
  {
    if(rc.Read(rcfname))
      displayRC(rc);
  }
  return 0;  // success
}