/*
   Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.

   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; version 2 of the License.

   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#include "Config.hpp"

#include <mgmapi.h>
#include <NdbOut.hpp>
#include "ConfigInfo.hpp"

#include <HashMap.hpp>

Config::Config(struct ndb_mgm_configuration *config_values) :
  m_configValues(config_values)
{
}


Config::Config(ConfigValues *config_values) :
  m_configValues((struct ndb_mgm_configuration*)config_values)
{
}

Config::Config(const Config* conf)
{
  // TODO Magnus, improve copy constructor
  // to not use pack/unpack
  assert(conf);
  UtilBuffer buf;
  conf->pack(buf);
  ConfigValuesFactory cvf;
  cvf.unpack(buf);
  m_configValues= (struct ndb_mgm_configuration*)cvf.getConfigValues();
}


Config::~Config() {
  ndb_mgm_destroy_configuration(m_configValues);
}

unsigned sections[]=
{
  CFG_SECTION_SYSTEM,
  CFG_SECTION_NODE,
  CFG_SECTION_CONNECTION
};
const size_t num_sections= sizeof(sections)/sizeof(unsigned);

static const ConfigInfo g_info;

void
Config::print(const char* section_filter, NodeId nodeid_filter,
              const char* param_filter,
              NdbOut& out) const {

  for(unsigned i= 0; i < num_sections; i++) {
    unsigned section= sections[i];
    ConfigIter it(this, section);

    if (it.first())
      continue;

    for(;it.valid();it.next()) {

      Uint32 section_type;
      if(it.get(CFG_TYPE_OF_SECTION, &section_type) != 0)
        continue;

      const ConfigInfo::ParamInfo* pinfo= NULL;
      ConfigInfo::ParamInfoIter param_iter(g_info,
                                           section,
                                           section_type);

      const char* section_name= g_info.sectionName(section, section_type);

      // Section name filter
      if (section_filter &&                     // Filter is on
          strcmp(section_filter, section_name)) // Value is different
        continue;

      // NodeId filter
      Uint32 nodeid = 0;
      it.get(CFG_NODE_ID, &nodeid);
      if (nodeid_filter &&                   // Filter is on
          nodeid_filter != nodeid)           // Value is different
        continue;

      /*  Loop through the section and print those values that exist */
      Uint32 val;
      Uint64 val64;
      const char* val_str;
      while((pinfo= param_iter.next())){

        // Param name filter
        if (param_filter &&                      // Filter is on
            strcmp(param_filter, pinfo->_fname)) // Value is different
          continue;

        if (section_name) // Print section name only first time
        {
          out << "[" << section_name << "]" << endl;
          section_name= NULL;
        }

        if (!it.get(pinfo->_paramId, &val))
          out << pinfo->_fname << "=" << val << endl;
        else if (!it.get(pinfo->_paramId, &val64))
          out << pinfo->_fname << "=" << val64 << endl;
        else if (!it.get(pinfo->_paramId, &val_str))
          out << pinfo->_fname << "=" << val_str << endl;
      }
    }
  }
}



Uint32
Config::getGeneration() const
{
  Uint32 generation;
  ConfigIter iter(this, CFG_SECTION_SYSTEM);

  if (iter.get(CFG_SYS_CONFIG_GENERATION, &generation))
    return 0;

  return generation;
}


Uint32
Config::getPrimaryMgmNode() const
{
  Uint32 primaryMgmNode;
  ConfigIter iter(this, CFG_SECTION_SYSTEM);

  if (iter.get(CFG_SYS_PRIMARY_MGM_NODE, &primaryMgmNode))
    return 0;

  return primaryMgmNode;
}


const char*
Config::getName() const
{
  const char* name;
  ConfigIter iter(this, CFG_SECTION_SYSTEM);

  if (iter.get(CFG_SYS_NAME, &name))
    return 0;

  return name;
}


bool
Config::setValue(Uint32 section, Uint32 section_no,
                 Uint32 id, Uint32 new_val)
{
  ConfigValues::Iterator iter(m_configValues->m_config);
  if (!iter.openSection(section, section_no))
    return false;

  if (!iter.set(id, new_val))
    return false;

  return true;
}


bool
Config::setValue(Uint32 section, Uint32 section_no,
                 Uint32 id, const char* new_val)
{
  ConfigValues::Iterator iter(m_configValues->m_config);
  if (!iter.openSection(section, section_no))
    return false;

  if (!iter.set(id, new_val))
    return false;

  return true;
}


bool
Config::setGeneration(Uint32 new_gen)
{
  return setValue(CFG_SECTION_SYSTEM, 0,
                  CFG_SYS_CONFIG_GENERATION,
                  new_gen);
}


bool
Config::setPrimaryMgmNode(Uint32 new_primary)
{
  return setValue(CFG_SECTION_SYSTEM, 0,
                  CFG_SYS_PRIMARY_MGM_NODE,
                  new_primary);
}


bool
Config::setName(const char* new_name)
{
  return setValue(CFG_SECTION_SYSTEM, 0,
                  CFG_SYS_NAME,
                  new_name);
}


Uint32
Config::pack(UtilBuffer& buf) const
{
  return m_configValues->m_config.pack(buf);
}


#include <ndb_base64.h>

bool
Config::pack64(BaseString& encoded) const
{
  UtilBuffer buf;
  if (m_configValues->m_config.pack(buf) == 0)
    return false;

  // Expand the string to correct length by filling with Z
  encoded.assfmt("%*s",
                 base64_needed_encoded_length(buf.length()),
                 "Z");

  if (base64_encode(buf.get_data(),
                    buf.length(),
                    (char*)encoded.c_str()))
    return false;
  return true;
}


enum diff_types {
  DT_DIFF,            // Value differed
  DT_MISSING_VALUE,   // Value didn't exist
  DT_MISSING_SECTION, // Section missing
  DT_ILLEGAL_CHANGE    // Illegal change detected
};


static void
add_diff(const char* name, const char* key,
         Properties& diff,
         const char* value_name, Properties* value)
{
  Properties *section;
  // Create a new section if it did not exist
  if (!diff.getCopy(key, &section)){
    Properties new_section(true);
    new_section.put("Key", key);
    new_section.put("Name", name);

    require(diff.put(key, &new_section));

    // Get copy of section
    require(diff.getCopy(key, &section));
  }

  // Make sure type of diff has been set
  Uint32 type;
  require(value->get("Type", &type));

  require(value->put("Name", value_name));

  // Add the value to the section if not already added
  // (a changed value will be detected twice)
  if (!section->put(value_name, value))
    require(section->getPropertiesErrno() ==
            E_PROPERTIES_ELEMENT_ALREADY_EXISTS);

  // Put the updated section into the diff
  require(diff.put(key, section, true));

  delete section;
}


static void
compare_value(const char* name, const char* key,
              const ConfigInfo::ParamInfo* pinfo,
              ConfigValues::ConstIterator& it,
              ConfigValues::ConstIterator& it2,
              Properties& diff)
{
  Uint32 pid= pinfo->_paramId;
  {
    Uint32 val;
    if (it.get(pid, &val) == true) {
      Uint32 val2;
      if (it2.get(pid, &val2) == true) {
        if (val != val2){
          Properties info(true);
          info.put("Type", DT_DIFF);
          info.put("New", val2);
          info.put("Old", val);
          add_diff(name, key,
                   diff,
                   pinfo->_fname, &info);
        }
      }
      else
      {
        Properties info(true);
        info.put("Type", DT_MISSING_VALUE);
        info.put("Old", val);
        add_diff(name, key,
                 diff,
                 pinfo->_fname, &info);
      }
      return;
    }
  }

  {
    Uint64 val;
    if (it.get(pid, &val) == true) {
      Uint64 val2;
      if (it2.get(pid, &val2) == true) {
        if (val != val2) {
          Properties info(true);
          info.put("Type", DT_DIFF);
          info.put64("New", Uint64(val2));
          info.put64("Old", Uint64(val));
          add_diff(name, key,
                   diff,
                   pinfo->_fname, &info);
        }
      }
      else
      {
        Properties info(true);
        info.put("Type", DT_MISSING_VALUE);
        info.put64("Old", Uint64(val));
        add_diff(name, key,
                 diff,
                 pinfo->_fname, &info);
      }
      return;
    }
  }

  {
    const char* val;
    if (it.get(pid, &val) == true) {
      const char* val2;
      if (it2.get(pid, &val2) == true) {
        if (strcmp(val, val2)) {
          Properties info(true);
          info.put("Type", DT_DIFF);
          info.put("New", val2);
          info.put("Old", val);
          add_diff(name, key,
                   diff,
                   pinfo->_fname, &info);
        }
      }
      else
      {
        Properties info(true);
        info.put("Type", DT_MISSING_VALUE);
        info.put("Old", val);
        add_diff(name, key,
                 diff,
                 pinfo->_fname, &info);
      }
      return;
    }
  }
}


static void
diff_system(const Config* a, const Config* b, Properties& diff)
{
  ConfigIter itA(a, CFG_SECTION_SYSTEM);
  ConfigIter itB(b, CFG_SECTION_SYSTEM);

  // Check each possible configuration value
  const ConfigInfo::ParamInfo* pinfo= NULL;
  ConfigInfo::ParamInfoIter param_iter(g_info,
                                       CFG_SECTION_SYSTEM,
                                       CFG_SECTION_SYSTEM);
  while((pinfo= param_iter.next())) {
    /*  Loop through the section and compare values */
    compare_value("SYSTEM", "", pinfo, itA.m_config, itB.m_config, diff);
  }
}


static void
diff_nodes(const Config* a, const Config* b, Properties& diff)
{
  ConfigIter itA(a, CFG_SECTION_NODE);

  for(;itA.valid(); itA.next())
  {

    /* Get typ of Node */
    Uint32 nodeType;
    require(itA.get(CFG_TYPE_OF_SECTION, &nodeType) == 0);

    BaseString name(g_info.sectionName(CFG_SECTION_NODE, nodeType));

    /* Get NodeId which is "primary key" */
    Uint32 nodeId;
    require(itA.get(CFG_NODE_ID, &nodeId) == 0);

    BaseString key;
    key.assfmt("NodeId=%d", nodeId);

    /* Position itB in the section with same NodeId */
    ConfigIter itB(b, CFG_SECTION_NODE);
    if (itB.find(CFG_NODE_ID, nodeId) != 0)
    {
      // A whole node has been removed
      Properties info(true);
      info.put("Type", DT_MISSING_SECTION);
      info.put("Why", "Node removed");
      add_diff(name.c_str(), key.c_str(),
               diff,
               "Node removed", &info);

      continue;
    }

    /* Make sure it has the same node type */
    Uint32 nodeType2;
    require(itB.get(CFG_TYPE_OF_SECTION, &nodeType2) == 0);
    if ((nodeType == NODE_TYPE_DB || nodeType == NODE_TYPE_MGM) &&
        nodeType != nodeType2)
    {
      // DB or MGM node has changed type -> not allowed change
      Properties info(true);
      info.put("Type", DT_ILLEGAL_CHANGE);
      info.put("Why", "Node has changed type");
      add_diff(name.c_str(), key.c_str(),
               diff,
               "Node type changed", &info);
      continue;
    }

    // Check each possible configuration value
    const ConfigInfo::ParamInfo* pinfo= NULL;
    ConfigInfo::ParamInfoIter param_iter(g_info, CFG_SECTION_NODE, nodeType);
    while((pinfo= param_iter.next())) {
      /*  Loop through the section and compare values */
      compare_value(name.c_str(), key.c_str(), pinfo,
                    itA.m_config, itB.m_config, diff);
    }
  }
}


struct NodePair {
  Uint32 nodeId1;
  Uint32 nodeId2;
  NodePair(Uint32 n1, Uint32 n2) : nodeId1(n1), nodeId2(n2) {};
};

static void
diff_connections(const Config* a, const Config* b, Properties& diff)
{
  // Build lookup table to make it a quick operation to check
  // if a given connection(with "primary key" NodeId1+NodeId2)
  // exists in other config, in such case return the section number
  // so that the section can be retrieved quickly
  HashMap<NodePair, Uint32> lookup;
  {
    Uint32 nodeId1, nodeId2;
    ConfigIter itB(b, CFG_SECTION_CONNECTION);
    for(; itB.valid(); itB.next())
    {
      require(itB.get(CFG_CONNECTION_NODE_1, &nodeId1) == 0);
      require(itB.get(CFG_CONNECTION_NODE_2, &nodeId2) == 0);

      require(lookup.insert(NodePair(nodeId1, nodeId2), itB.m_sectionNo));
    }
  }

  ConfigIter itA(a, CFG_SECTION_CONNECTION);

  for(;itA.valid(); itA.next())
  {
    /* Get typ of connection */
    Uint32 connectionType;
    require(itA.get(CFG_TYPE_OF_SECTION, &connectionType) == 0);

    BaseString name(g_info.sectionName(CFG_SECTION_CONNECTION, connectionType));

    /* Get NodeId1 and NodeId2 which is "primary key" */
    Uint32 nodeId1_A, nodeId2_A;
    require(itA.get(CFG_CONNECTION_NODE_1, &nodeId1_A) == 0);
    require(itA.get(CFG_CONNECTION_NODE_2, &nodeId2_A) == 0);

    BaseString key;
    key.assfmt("NodeId1=%d;NodeId2=%d", nodeId1_A, nodeId2_A);

    /* Lookup connection and get section no if it exists */
    Uint32 sectionNo;
    if (!lookup.search(NodePair(nodeId1_A, nodeId2_A), sectionNo))
    {
      // A connection has been removed
      Properties info(true);
      info.put("Type", DT_MISSING_SECTION);
      info.put("Why", "Connection removed");
      add_diff(name.c_str(), key.c_str(),
               diff,
               "Connection removed", &info);

      continue;
    }

    /* Open the connection section in other config */
    ConfigValues::ConstIterator itB(b->m_configValues->m_config);
    require(itB.openSection(CFG_SECTION_CONNECTION, sectionNo) == true);

    Uint32 nodeId1_B, nodeId2_B;
    require(itB.get(CFG_CONNECTION_NODE_1, &nodeId1_B) == true);
    require(itB.get(CFG_CONNECTION_NODE_2, &nodeId2_B) == true);
    require(nodeId1_A == nodeId1_B && nodeId2_A == nodeId2_B);

    // Check each possible configuration value
    const ConfigInfo::ParamInfo* pinfo= NULL;
    ConfigInfo::ParamInfoIter param_iter(g_info,
                                         CFG_SECTION_CONNECTION,
                                         connectionType);
    while((pinfo= param_iter.next())) {
      /*  Loop through the section and compare values */
      compare_value(name.c_str(), key.c_str(), pinfo, itA.m_config, itB, diff);
    }
  }
}


static bool
include_section(const unsigned* exclude, unsigned section){
  if (exclude == NULL)
    return true;

  while(*exclude){
    if (*exclude == section)
      return false;
    exclude++;
  }
  return true;
}


/**
  Generate a diff list
*/

void Config::diff(const Config* other, Properties& diff,
                  const unsigned* exclude) const {

  if (include_section(exclude, CFG_SECTION_SYSTEM)) {
    diff_system(this, other, diff);
    diff_system(other, this, diff);
  }
  if (include_section(exclude, CFG_SECTION_NODE)) {
    diff_nodes(this, other, diff);
    diff_nodes(other, this, diff);
  }
  if (include_section(exclude, CFG_SECTION_CONNECTION)) {
    diff_connections(this, other, diff);
    diff_connections(other, this, diff);
  }
}


static const char*
p2s(const Properties* prop, const char* name, BaseString& buf){
  PropertiesType type;
  require(prop->getTypeOf(name, &type));
  switch(type){
  case PropertiesType_Uint32:
  {
    Uint32 val;
    require(prop->get(name, &val));
    buf.assfmt("%u", val);
    break;
  }
  case PropertiesType_Uint64:
  {
    Uint64 val;
    require(prop->get(name, &val));
    buf.assfmt("%llu", val);
    break;
  }
  case PropertiesType_char:
  {
    require(prop->get(name, buf));
    break;
  }
  default:
    require(false);
    break;
  }
  return buf.c_str();
}


const char*
Config::diff2str(const Properties& diff_list, BaseString& str) const
{
  const char* name;
  Properties::Iterator prop_it(&diff_list);
  while ((name= prop_it.next())){

    const Properties *node;
    require(diff_list.get(name, &node));

    require(node->get("Name", &name));
    str.appfmt("[%s]\n", name);

    BaseString key;
    require(node->get("Key", key));
    if (key.length() > 0){
      Vector<BaseString> keys;
      key.split(keys, ";");
      for (unsigned i= 0; i < keys.size(); i++)
        str.appfmt("%s\n", keys[i].c_str());
    }

    BaseString buf;
    Properties::Iterator prop_it2(node);
    while ((name= prop_it2.next())){

      const Properties *what;
      if (!node->get(name, &what))
        continue;

      Uint32 type;
      require(what->get("Type", &type));
      require(what->get("Name", &name));
      switch (type) {
      case DT_DIFF:
      {
        str.appfmt("-%s=%s\n", name, p2s(what, "Old", buf));
        str.appfmt("+%s=%s\n", name, p2s(what, "New", buf));
        break;
      }

      case DT_MISSING_VALUE:
      {
        str.appfmt("-%s=%s\n", name, p2s(what, "Old", buf));
        break;
      }

      case DT_MISSING_SECTION:
      {
        const char* why;
        if (what->get("Why", &why))
          str.appfmt("%s\n", why);
        break;
      }

      case DT_ILLEGAL_CHANGE:
      {
        const char* why;
        str.appfmt("Illegal change\n");
        if (what->get("Why", &why))
          str.appfmt("%s\n", why);
        break;
      }

      default:
        str.appfmt("Illegal 'type' found in diff_list\n");
        require(false);
        break;
      }
    }
    str.appfmt("\n");
  }
  return str.c_str();
}


void Config::print_diff(const Config* other) const {
  Properties diff_list;
  diff(other, diff_list);
  BaseString str;
  ndbout_c("%s", diff2str(diff_list, str));
}


const char*
Config::diff2str(const Config* other, BaseString& str, const unsigned * exclude) const {
  Properties diff_list;
  diff(other, diff_list, exclude);
  return diff2str(diff_list, str);
}


bool Config::equal(const Properties& diff_list) const {
  int count= 0;
  Properties::Iterator prop_it(&diff_list);
  while ((prop_it.next()))
    count++;
  return (count == 0);
}


bool Config::equal(const Config* other, const unsigned * exclude) const {
  Properties diff_list;
  diff(other, diff_list, exclude);
  return equal(diff_list);
}



bool Config::illegal_change(const Properties& diff_list) const {
  bool illegal= false;
  const char* name;
  Properties::Iterator prop_it(&diff_list);
  while ((name= prop_it.next())){

    const Properties *node;
    require(diff_list.get(name, &node));

    Properties::Iterator prop_it2(node);
    while ((name= prop_it2.next())){

      const Properties *what;
      if (!node->get(name, &what))
        continue;

      Uint32 type;
      require(what->get("Type", &type));
      if (type == DT_ILLEGAL_CHANGE)
      {
        illegal= true;
        break;
      }
    }
  }
  return illegal;
}


bool Config::illegal_change(const Config* other) const {
  Properties diff_list;
  diff(other, diff_list);
  return illegal_change(diff_list);
}


void Config::getConnectString(BaseString& connectstring,
                              const BaseString& separator) const
{
  bool first= true;
  ConfigIter it(this, CFG_SECTION_NODE);

  for(;it.valid(); it.next())
  {
    /* Get type of Node */
    Uint32 nodeType;
    require(it.get(CFG_TYPE_OF_SECTION, &nodeType) == 0);

    if (nodeType != NODE_TYPE_MGM)
      continue;

    Uint32 port;
    const char* hostname;
    require(it.get(CFG_NODE_HOST, &hostname) == 0);
    require(it.get(CFG_MGM_PORT, &port) == 0);

    if (!first)
      connectstring.append(separator);
    first= false;

    connectstring.appfmt("%s:%d", hostname, port);

  }
  ndbout << connectstring << endl;
}


void
Config::get_nodemask(NodeBitmask& mask,
                     ndb_mgm_node_type type) const
{
  mask.clear();
  ConfigIter it(this, CFG_SECTION_NODE);
  for (; it.valid(); it.next())
  {
    Uint32 node_type;
    require(it.get(CFG_TYPE_OF_SECTION, &node_type) == 0);

    if (type == NDB_MGM_NODE_TYPE_UNKNOWN || // UNKOWN -> add all nodes to mask
        type == (ndb_mgm_node_type)node_type)
    {
      Uint32 nodeid;
      require(it.get(CFG_NODE_ID, &nodeid) == 0);
      mask.set(nodeid);
    }
  }
}


Uint32
Config::checksum(void) const {
  Uint32 chk;

  UtilBuffer buf;
  pack(buf);

  // Checksum is the last 4 bytes in buffer
  const char* chk_ptr = (const char*)buf.get_data();
  chk_ptr += buf.length() - sizeof(Uint32);
  chk = *(Uint32*) chk_ptr;

  return chk;
}

