/*
   +----------------------------------------------------------------------+
   | HipHop for PHP                                                       |
   +----------------------------------------------------------------------+
   | Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com)     |
   | Copyright (c) 1997-2010 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
*/

#include "hphp/runtime/ext/mysql_stats.h"
#include "hphp/util/util.h"

namespace HPHP {
///////////////////////////////////////////////////////////////////////////////

bool MySqlStats::s_inited = false;
hphp_string_map<MySqlStats::Verb> MySqlStats::s_verbs;
const char *MySqlStats::s_verb_names[VERB_COUNT];
Mutex MySqlStats::s_mutex;
MySqlStats::StatsMap MySqlStats::s_stats;

void MySqlStats::Init() {
  assert(!s_inited);

  s_verbs["t_begin"   ] = T_BEGIN;
  s_verbs["t_commit"  ] = T_COMMIT;
  s_verbs["t_rollback"] = T_ROLLBACK;

  s_verbs["x_insert"  ] = X_INSERT;
  s_verbs["x_update"  ] = X_UPDATE;
  s_verbs["x_incdec"  ] = X_INCDEC;
  s_verbs["x_delete"  ] = X_DELETE;
  s_verbs["x_replace" ] = X_REPLACE;
  s_verbs["x_select"  ] = X_SELECT;

  s_verbs["t_insert"  ] = T_INSERT;
  s_verbs["t_update"  ] = T_UPDATE;
  s_verbs["t_incdec"  ] = T_INCDEC;
  s_verbs["t_delete"  ] = T_DELETE;
  s_verbs["t_replace" ] = T_REPLACE;
  s_verbs["t_select"  ] = T_SELECT;

  s_verbs["n_insert"  ] = N_INSERT;
  s_verbs["n_update"  ] = N_UPDATE;
  s_verbs["n_incdec"  ] = N_INCDEC;
  s_verbs["n_delete"  ] = N_DELETE;
  s_verbs["n_replace" ] = N_REPLACE;
  s_verbs["n_select"  ] = N_SELECT;

  s_verb_names[UNKNOWN   ] = "unknown";

  s_verb_names[T_BEGIN   ] = "begin";
  s_verb_names[T_COMMIT  ] = "commit";
  s_verb_names[T_ROLLBACK] = "rollback";

  s_verb_names[X_INSERT  ] = "x_insert";
  s_verb_names[X_UPDATE  ] = "x_update";
  s_verb_names[X_INCDEC  ] = "x_incdec";
  s_verb_names[X_DELETE  ] = "x_delete";
  s_verb_names[X_REPLACE ] = "x_replace";
  s_verb_names[X_SELECT  ] = "x_select";

  s_verb_names[T_INSERT  ] = "t_insert";
  s_verb_names[T_UPDATE  ] = "t_update";
  s_verb_names[T_INCDEC  ] = "t_incdec";
  s_verb_names[T_DELETE  ] = "t_delete";
  s_verb_names[T_REPLACE ] = "t_replace";
  s_verb_names[T_SELECT  ] = "t_select";

  s_verb_names[N_INSERT  ] = "n_insert";
  s_verb_names[N_UPDATE  ] = "n_update";
  s_verb_names[N_INCDEC  ] = "n_incdec";
  s_verb_names[N_DELETE  ] = "n_delete";
  s_verb_names[N_REPLACE ] = "n_replace";
  s_verb_names[N_SELECT  ] = "n_select";
}

MySqlStats::Verb MySqlStats::Translate(const std::string &verb,
                                       int xactionCount) {
  if (!s_inited) Init();
  string composed = xactionCount ? (xactionCount > 1 ? "x_" : "t_") : "n_";
  composed += Util::toLower(verb);
  hphp_string_map<Verb>::const_iterator iter = s_verbs.find(composed);
  if (iter != s_verbs.end()) {
    return iter->second;
  }
  return UNKNOWN;
}

const char * MySqlStats::Translate(Verb verb) {
  if (!s_inited) Init();
  if (verb >= 0 && verb < VERB_COUNT) {
    return s_verb_names[verb];
  }
  return NULL;
}

void MySqlStats::Record(const std::string &verb,
                        int xactionCount /* = 0 */,
                        const std::string &table /* = "" */) {
  Verb v = Translate(verb, xactionCount);
  if (v == UNKNOWN) return;

  string ltable = Util::toLower(table);

  Lock lock(s_mutex);
  StatsMap::iterator iter = s_stats.find(ltable);
  if (iter == s_stats.end()) {
    StatsPtr stats(new Stats());
    memset(stats.get(), 0, sizeof(Stats));
    stats->actions[v] = 1;
    s_stats[ltable] = stats;
  } else {
    Stats &stats = *iter->second;
    ++stats.actions[v];
  }
}

std::string MySqlStats::ReportStats() {
  std::ostringstream out;

  Lock lock(s_mutex);
  for (StatsMap::const_iterator iter = s_stats.begin(); iter != s_stats.end();
       ++iter) {
    string table = iter->first;
    if (table.empty()) {
      table = "x";
    } else {
      char ch = table[0];
      if (ch >= '0' && ch <= '9') {
        table = "TABLE_" + table; // so XML will like it
      }
    }
    out << "<" << table << ">\n";
    Stats &stats = *iter->second;
    for (int i = 0; i < VERB_COUNT; i++) {
      const char *name = Translate((Verb)i);
      assert(name);
      out << "  <" << name << ">";
      out << stats.actions[i];
      out << "</" << name << ">\n";
    }
    out << "</" << table << ">\n";
  }

  return out.str();
}

///////////////////////////////////////////////////////////////////////////////
}