#include <llarp/nodedb.h>
#include <llarp/router_contact.h>
#include <map>
#include "crypto.hpp"
#include "fs.hpp"

static const char skiplist_subdirs[] = "0123456789ABCDEF";

struct llarp_nodedb {
  std::map<llarp::pubkey, llarp_rc *> entries;

  ssize_t Load(const fs::path &path) {
    std::error_code ec;
    if (!fs::exists(path, ec)) {
      return -1;
    }
    ssize_t loaded = 0;

    for (const char &ch : skiplist_subdirs) {
      fs::path sub = path / std::string(ch, 1);
      for (auto &f : fs::directory_iterator(sub)) {
        ssize_t l = loadSubdir(f);
        if (l > 0) loaded += l;
      }
    }
    return loaded;
  }

  bool loadfile(const fs::path &fpath) {
    llarp_rc *rc = new llarp_rc;
    llarp_buffer_t buff;
    FILE *f = fopen(fpath.c_str(), "rb");
    if (!f) return false;
    if (!llarp_buffer_readfile(&buff, f, &llarp_g_mem)) {
      fclose(f);
      return false;
    }
    fclose(f);
    if (llarp_rc_bdecode(rc, &buff)) {
      if (llarp_rc_verify_sig(rc)) {
        llarp::pubkey pk;
        memcpy(pk.data(), rc->pubkey, pk.size());
        entries[pk] = rc;
        return true;
      }
    }
    llarp_rc_free(rc);
    delete rc;
    return false;
  }

  ssize_t loadSubdir(const fs::path &dir) {
    ssize_t sz = 0;
    for (auto &path : fs::directory_iterator(dir)) {
      if (loadfile(path)) sz++;
    }
    return sz;
  }
};

extern "C" {

struct llarp_nodedb *llarp_nodedb_new() {
  return new llarp_nodedb;
}

void llarp_nodedb_free(struct llarp_nodedb **n) {
  if (*n) delete *n;
  *n = nullptr;
}

bool llarp_nodedb_ensure_dir(const char *dir) {
  fs::path path(dir);
  std::error_code ec;
  if (!fs::exists(dir, ec)) fs::create_directories(path, ec);

  if (ec) return false;

  if (!fs::is_directory(path)) return false;

  for (const char &ch : skiplist_subdirs) {
    fs::path sub = path / std::string(ch, 1);
    fs::create_directory(sub, ec);
    if (ec) return false;
  }
  return true;
}

ssize_t llarp_nodedb_load_dir(struct llarp_nodedb *n, const char *dir) {
  return n->Load(dir);
}
}