/*
 *
 * (C) 2019-23 - 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"

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

FlowStats::FlowStats() { resetStats(); }

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

FlowStats::~FlowStats() {}

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

void FlowStats::incStats(Bitmap128 alert_bitmap, u_int8_t l4_protocol,
                         AlertLevel alert_level, u_int8_t dscp_cli2srv,
                         u_int8_t dscp_srv2cli, Flow *flow) {
  u_int i;

  for (i = 0; i < alert_bitmap.numBits(); i++) {
    if (alert_bitmap.isSetBit(i)) counters[i]++;
  }

  protocols[l4_protocol]++;
  alert_levels[alert_level]++;
  if (dscp_cli2srv != dscp_srv2cli) {
    dscps[dscp_cli2srv]++;
    dscps[dscp_srv2cli]++;
  } else
    dscps[dscp_cli2srv]++;

  if (flow) {
    u_int16_t cli_pool, srv_pool;
    bool cli_pool_found = false, srv_pool_found = false;

    if (flow->get_cli_host()) {
      cli_pool = flow->get_cli_host()->get_host_pool();
      cli_pool_found = true;
    } else {
      /* Host null, let's try using IpAddress */
      IpAddress *ip = (IpAddress *)flow->get_cli_ip_addr();
      ndpi_patricia_node_t *cli_target_node = NULL;

      if (flow->get_cli_ip_addr())
        cli_pool_found = flow->getInterface()->getHostPools()->findIpPool(
            ip, flow->get_vlan_id(), &cli_pool, &cli_target_node);
    }

    if (flow->get_srv_host()) {
      srv_pool = flow->get_srv_host()->get_host_pool();
      srv_pool_found = true;
    } else {
      /* Host null, let's try using IpAddress */
      ndpi_patricia_node_t *srv_target_node = NULL;
      IpAddress *ip = (IpAddress *)flow->get_srv_ip_addr();

      if (flow->get_srv_ip_addr())
        srv_pool_found = flow->getInterface()->getHostPools()->findIpPool(
            ip, flow->get_vlan_id(), &srv_pool, &srv_target_node);
    }

    if (srv_pool_found && cli_pool_found) {
      /* Both pools found */
      if (cli_pool != srv_pool) {
        /* Different pool id, inc both */
        host_pools[cli_pool]++;
        host_pools[srv_pool]++;
      } else {
        /* Same pool id, inc only one time */
        host_pools[cli_pool]++;
      }
    } else if (srv_pool_found) {
      host_pools[srv_pool]++;
    } else if (cli_pool_found) {
      host_pools[cli_pool]++;
    }
  }
}

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

void FlowStats::lua(lua_State *vm) {
  lua_newtable(vm);

  for (int i = 0; i < BITMAP_NUM_BITS; i++) {
    if (unlikely(counters[i] > 0)) {
      lua_newtable(vm);

      lua_push_uint64_table_entry(vm, "count", counters[i]);

      lua_pushinteger(vm, i);
      lua_insert(vm, -2);
      lua_rawset(vm, -3);
    }
  }

  lua_pushstring(vm, "status");
  lua_insert(vm, -2);
  lua_settable(vm, -3);

  lua_newtable(vm);

  for (int i = 0; i < 0x100; i++) {
    if (unlikely(protocols[i] > 0)) {
      lua_newtable(vm);

      lua_push_uint64_table_entry(vm, "count", protocols[i]);

      lua_pushinteger(vm, i);
      lua_insert(vm, -2);
      lua_rawset(vm, -3);
    }
  }

  lua_pushstring(vm, "l4_protocols");
  lua_insert(vm, -2);
  lua_settable(vm, -3);

  lua_newtable(vm);

  for (int i = 0; i < 64; i++) {
    if (unlikely(dscps[i] > 0)) {
      lua_newtable(vm);

      lua_push_uint64_table_entry(vm, "count", dscps[i]);

      lua_pushinteger(vm, i);
      lua_insert(vm, -2);
      lua_rawset(vm, -3);
    }
  }

  lua_pushstring(vm, "dscps");
  lua_insert(vm, -2);
  lua_settable(vm, -3);

  /* Host pool */
  lua_newtable(vm);

  for (int i = 0; i < MAX_NUM_HOST_POOLS; i++) {
    if (unlikely(host_pools[i] > 0)) {
      lua_newtable(vm);

      lua_push_uint64_table_entry(vm, "count", host_pools[i]);

      lua_pushinteger(vm, i);
      lua_insert(vm, -2);
      lua_rawset(vm, -3);
    }
  }

  lua_pushstring(vm, "host_pool_id");
  lua_insert(vm, -2);
  lua_settable(vm, -3);

  /* Alert levels */
  u_int32_t count_notice_or_lower = 0, count_warning = 0, count_error = 0,
            count_critical = 0, count_emergency = 0;

  for (int i = 0; i < ALERT_LEVEL_MAX_LEVEL; i++) {
    AlertLevel alert_level = (AlertLevel)i;

    switch (Utils::mapAlertLevelToGroup(alert_level)) {
      case alert_level_group_notice_or_lower:
        count_notice_or_lower += alert_levels[alert_level];
        break;
      case alert_level_group_warning:
        count_warning += alert_levels[alert_level];
        break;
      case alert_level_group_error:
        count_error += alert_levels[alert_level];
        break;
      case alert_level_group_critical:
        count_critical += alert_levels[alert_level];
        break;
      case alert_level_group_emergency:
        count_error += alert_levels[alert_level];
        break;
      default:
        break;
    }
  }

  lua_newtable(vm);

  if (count_notice_or_lower > 0)
    lua_push_uint64_table_entry(vm, "notice_or_lower", count_notice_or_lower);
  if (count_warning > 0)
    lua_push_uint64_table_entry(vm, "warning", count_warning);
  if (count_error > 0) lua_push_uint64_table_entry(vm, "error", count_error);
  if (count_critical > 0)
    lua_push_uint64_table_entry(vm, "critical", count_critical);
  if (count_emergency > 0)
    lua_push_uint64_table_entry(vm, "emergency", count_emergency);

  lua_pushstring(vm, "alert_levels");
  lua_insert(vm, -2);
  lua_settable(vm, -3);

  lua_newtable(vm);

  std::map<std::string, u_int16_t>::iterator it;
  for (it = talking_hosts.begin(); it != talking_hosts.end(); it++)
    lua_push_uint32_table_entry(vm, it->first.c_str(), it->second);

  lua_pushstring(vm, "talking_with");
  lua_insert(vm, -2);
  lua_settable(vm, -3);
}

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

void FlowStats::updateTalkingHosts(Flow *f) {
  char buf[64];
  std::pair<std::map<std::string, u_int16_t>::iterator, bool> ret;
  ret = talking_hosts.insert(std::pair<std::string, u_int16_t>(
      f->get_cli_ip_addr()->print(buf, sizeof(buf)), 1));

  if (!ret.second) ret.first->second++;

  ret = talking_hosts.insert(std::pair<std::string, u_int16_t>(
      f->get_srv_ip_addr()->print(buf, sizeof(buf)), 1));

  if (!ret.second) ret.first->second++;
}

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

void FlowStats::resetStats() {
  memset(counters, 0, sizeof(counters));
  memset(protocols, 0, sizeof(protocols));
  memset(alert_levels, 0, sizeof(alert_levels));
  memset(dscps, 0, sizeof(dscps));
  memset(host_pools, 0, sizeof(host_pools));
  talking_hosts.clear();
}

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