/*
 *
 * (C) 2013-23 - ntop.org
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

#include "ntop_includes.h"

/* ************************************ */

InterfaceStatsHash::InterfaceStatsHash(u_int _max_hash_size) {
  max_hash_size = _max_hash_size;
  buckets = (sFlowInterfaceStats **)calloc(sizeof(sFlowInterfaceStats *),
                                           max_hash_size);

  if (buckets == NULL) throw "Not enough memory";
}

/* ************************************ */

InterfaceStatsHash::~InterfaceStatsHash() {
  for (u_int i = 0; i < max_hash_size; i++) {
    if (buckets[i] != NULL) {
      if (buckets[i]->ifName) free(buckets[i]->ifName);

      if (buckets[i]->container_info_set) {
        if (buckets[i]->container_info.id) free(buckets[i]->container_info.id);
        if (buckets[i]->container_info.name)
          free(buckets[i]->container_info.name);

        if (buckets[i]->container_info.data_type ==
            container_info_data_type_k8s) {
          if (buckets[i]->container_info.data.k8s.pod)
            free(buckets[i]->container_info.data.k8s.pod);
          if (buckets[i]->container_info.data.k8s.ns)
            free(buckets[i]->container_info.data.k8s.ns);
        } else if (buckets[i]->container_info.data_type ==
                   container_info_data_type_docker)
          ;
      }

      free(buckets[i]);
    }
  }

  free(buckets);
}
/* ************************************ */

bool InterfaceStatsHash::set(const sFlowInterfaceStats *const stats) {
  sFlowInterfaceStats *head;
  u_int32_t ifIndex = stats->ifIndex, deviceIP = stats->deviceIP;
  const char *ifName = stats->ifName;
  u_int32_t hash = (deviceIP + ifIndex + Utils::hashString(ifName)) %
                   max_hash_size,
            num_runs = 0;
  bool ret = true;

  m.lock(__FILE__, __LINE__);

  if (!buckets[hash]) goto new_bucket;

  head = (sFlowInterfaceStats *)buckets[hash];

  while (head != NULL) {
    if (head->deviceIP == deviceIP && head->ifIndex == ifIndex &&
        ((!head->ifName && !ifName) ||
         (head->ifName && ifName && strcmp(head->ifName, ifName) == 0))) {
      break;
    } else {
      /* Inplace hash */
      hash = (hash + 1) % max_hash_size, num_runs++;

      if (num_runs >= max_hash_size) {
        ntop->getTrace()->traceEvent(
            TRACE_WARNING, "Internal error: too many loops=%u", max_hash_size);
        ret = false;
        goto unlock;
      }

      head = buckets[hash];
    }
  }

  if (head) {
    /* Update values */
    head->ifType = stats->ifType, head->ifSpeed = stats->ifSpeed,
    head->ifFullDuplex = stats->ifFullDuplex,
    head->ifAdminStatus = stats->ifAdminStatus,
    head->ifOperStatus = stats->ifOperStatus,
    head->ifPromiscuousMode = stats->ifPromiscuousMode;

    if (stats->samplesGenerated > 0 &&
        stats->samplesGenerated == head->samplesGenerated) {
      /*
        This is an update as `samplesGenerated`.
        Ubiquiti routers when generating sFlow send two counters samples in two
        different packets with the same value for `samplesGenerated`. The first
        counter sample has data for the IN direction and the second counter
        sample has data for the OUT direction. In this case, we need to check
        and update values rather than overwriting them.
       */
      head->ifInOctets += stats->ifInOctets,
          head->ifInPackets += stats->ifInPackets,
          head->ifInErrors += stats->ifInErrors,
          head->ifOutOctets += stats->ifOutOctets,
          head->ifOutPackets += stats->ifOutPackets,
          head->ifOutErrors += stats->ifOutErrors;
    } else {
      head->ifInOctets = stats->ifInOctets,
      head->ifInPackets = stats->ifInPackets,
      head->ifInErrors = stats->ifInErrors,
      head->ifOutOctets = stats->ifOutOctets,
      head->ifOutPackets = stats->ifOutPackets,
      head->ifOutErrors = stats->ifOutErrors;
    }

    head->samplesGenerated = stats->samplesGenerated;
  } else {
  new_bucket:
    buckets[hash] = (sFlowInterfaceStats *)malloc(sizeof(sFlowInterfaceStats));

    if (!buckets[hash]) {
      ret = false;
      goto unlock;
    }

    memcpy(buckets[hash], stats, sizeof(sFlowInterfaceStats));

    if (buckets[hash]->ifName)
      buckets[hash]->ifName = strdup(buckets[hash]->ifName);

    if (buckets[hash]->container_info_set) {
      if (buckets[hash]->container_info.id)
        buckets[hash]->container_info.id =
            strdup(buckets[hash]->container_info.id);
      if (buckets[hash]->container_info.name)
        buckets[hash]->container_info.name =
            strdup(buckets[hash]->container_info.name);

      if (buckets[hash]->container_info.data_type ==
          container_info_data_type_k8s) {
        if (buckets[hash]->container_info.data.k8s.pod)
          buckets[hash]->container_info.data.k8s.pod =
              strdup(buckets[hash]->container_info.data.k8s.pod);
        if (buckets[hash]->container_info.data.k8s.ns)
          buckets[hash]->container_info.data.k8s.ns =
              strdup(buckets[hash]->container_info.data.k8s.ns);
      } else if (buckets[hash]->container_info.data_type ==
                 container_info_data_type_docker) {
      }
    }
  }

unlock:
  m.unlock(__FILE__, __LINE__);

  return (ret);
}

/* ************************************ */

void InterfaceStatsHash::luaDeviceList(lua_State *vm) {
  std::set<u_int32_t>
      flowDevices; /* Set size automatically limited by max_hash_size */
  std::set<u_int32_t>::const_iterator it;

  lua_newtable(vm);

  m.lock(__FILE__, __LINE__);

  for (u_int i = 0; i < max_hash_size; i++) {
    sFlowInterfaceStats *head = (sFlowInterfaceStats *)buckets[i];

    if (head) {
      bool found = false;

      if (flowDevices.find(head->deviceIP) != flowDevices.end()) found = true;

      if (!found) {
        char a[64];

        flowDevices.insert(head->deviceIP);

        lua_push_uint64_table_entry(
            vm, Utils::intoaV4(head->deviceIP, a, sizeof(a)), head->deviceIP);
      }
    }
  }

  m.unlock(__FILE__, __LINE__);
}

/* ************************************ */

void InterfaceStatsHash::luaDeviceInfo(lua_State *vm, u_int32_t deviceIP) {
  lua_newtable(vm);

  m.lock(__FILE__, __LINE__);

  for (u_int i = 0; i < max_hash_size; i++) {
    sFlowInterfaceStats *head = (sFlowInterfaceStats *)buckets[i];

    if (head && (head->deviceIP == deviceIP)) {
      lua_newtable(vm);

      lua_push_uint64_table_entry(vm, "ifType", head->ifType);
      if (head->ifName) lua_push_str_table_entry(vm, "ifName", head->ifName);
      if (head->container_info_set) {
        Utils::containerInfoLua(vm, &head->container_info);

        lua_pushstring(vm, "container");
        lua_insert(vm, -2);
        lua_settable(vm, -3);
      }
      lua_push_uint64_table_entry(vm, "ifSpeed", head->ifSpeed);
      lua_push_bool_table_entry(vm, "ifFullDuplex", head->ifFullDuplex);
      lua_push_bool_table_entry(vm, "ifAdminStatus", head->ifAdminStatus);
      lua_push_bool_table_entry(vm, "ifOperStatus", head->ifOperStatus);
      lua_push_bool_table_entry(vm, "ifPromiscuousMode",
                                head->ifPromiscuousMode);
      lua_push_uint64_table_entry(vm, "ifInOctets", head->ifInOctets);
      lua_push_uint64_table_entry(vm, "ifInPackets", head->ifInPackets);
      lua_push_uint64_table_entry(vm, "ifInErrors", head->ifInErrors);
      lua_push_uint64_table_entry(vm, "ifOutOctets", head->ifOutOctets);
      lua_push_uint64_table_entry(vm, "ifOutPackets", head->ifOutPackets);
      lua_push_uint64_table_entry(vm, "ifOutErrors", head->ifOutErrors);

      lua_pushinteger(vm, head->ifIndex);
      lua_insert(vm, -2);
      lua_settable(vm, -3);
    }
  }

  m.unlock(__FILE__, __LINE__);
}
