/*
    PowerDNS Versatile Database Driven Nameserver
    Copyright (C) 2002 - 2014  PowerDNS.COM BV

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2
    as published by the Free Software Foundation

    Additionally, the license of this program contains a special
    exception which allows to distribute the program in binary form when
    it is linked against OpenSSL.

    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
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "utility.hh"
#include "statbag.hh"
#include "pdnsexception.hh"
#include <iostream>
#include <sstream>
#include <algorithm>
#include "arguments.hh"
#include "lock.hh"
#include "iputils.hh"


#include "namespaces.hh"

StatBag::StatBag()
{
  d_doRings=false;
}

void StatBag::exists(const string &key)
{
  if(!d_keyDescrips.count(key))
    {
      throw PDNSException("Trying to deposit into unknown StatBag key '"+key+"'");
    }
}

string StatBag::directory()
{
  string dir;
  ostringstream o;

  for(map<string, AtomicCounter *>::const_iterator i=d_stats.begin();
      i!=d_stats.end();
      i++)
    {
      o<<i->first<<"="<<*(i->second)<<",";
    }


  for(const funcstats_t::value_type& val :  d_funcstats) {
    o << val.first<<"="<<val.second(val.first)<<",";
  }
  dir=o.str();
  return dir;
}


vector<string>StatBag::getEntries()
{
  vector<string> ret;

  for(map<string, AtomicCounter *>::const_iterator i=d_stats.begin();
      i!=d_stats.end();
      i++)
      ret.push_back(i->first);

  for(const funcstats_t::value_type& val :  d_funcstats) {
    ret.push_back(val.first);
  }


  return ret;

}

string StatBag::getDescrip(const string &item)
{
  exists(item);
  return d_keyDescrips[item];
}

void StatBag::declare(const string &key, const string &descrip)
{
  AtomicCounter *i=new AtomicCounter(0);
  d_stats[key]=i;
  d_keyDescrips[key]=descrip;
}

void StatBag::declare(const string &key, const string &descrip, StatBag::func_t func)
{

  d_funcstats[key]=func;
  d_keyDescrips[key]=descrip;
}

          
void StatBag::set(const string &key, AtomicCounter::native_t value)
{
  exists(key);
  *d_stats[key]=AtomicCounter(value);
}

AtomicCounter::native_t StatBag::read(const string &key)
{
  exists(key);
  funcstats_t::const_iterator iter = d_funcstats.find(key);
  if(iter != d_funcstats.end())
    return iter->second(iter->first);
  return *d_stats[key];
}

AtomicCounter::native_t StatBag::readZero(const string &key)
{
  exists(key);
  AtomicCounter::native_t tmp=*d_stats[key];
  d_stats[key]=0;
  return tmp;
}


string StatBag::getValueStr(const string &key)
{
  ostringstream o;
  o<<read(key);
  return o.str();
}

string StatBag::getValueStrZero(const string &key)
{
  ostringstream o;
  o<<readZero(key);
  return o.str();
}

AtomicCounter *StatBag::getPointer(const string &key)
{
  exists(key);
  return d_stats[key];
}

StatBag::~StatBag()
{
  for(map<string, AtomicCounter *>::const_iterator i=d_stats.begin();
      i!=d_stats.end();
      i++)
    {
      delete i->second;
    }
  
}

template<typename T, typename Comp>
StatRing<T,Comp>::StatRing(unsigned int size)
{
  d_items.set_capacity(size);
  pthread_mutex_init(&d_lock, 0);
}

template<typename T, typename Comp>
void StatRing<T,Comp>::account(const T& t)
{
  Lock l(&d_lock);
  d_items.push_back(t);
}

template<typename T, typename Comp>
unsigned int StatRing<T,Comp>::getSize()
{
  Lock l(&d_lock);
  return d_items.capacity();
}

template<typename T, typename Comp>
void StatRing<T,Comp>::resize(unsigned int newsize)
{
  Lock l(&d_lock);
  d_items.set_capacity(newsize);
}


template<typename T, typename Comp>
void StatRing<T,Comp>::setHelp(const string &str)
{
  d_help=str;
}

template<typename T, typename Comp>
string StatRing<T,Comp>::getHelp()
{
  return d_help;
}


template<typename T, typename Comp>
vector<pair<T, unsigned int> >StatRing<T,Comp>::get() const
{
  Lock l(&d_lock);
  map<T,unsigned int, Comp> res;
  for(typename boost::circular_buffer<T>::const_iterator i=d_items.begin();i!=d_items.end();++i) {
    res[*i]++;
  }
  
  vector<pair<T ,unsigned int> > tmp;
  for(typename map<T, unsigned int>::const_iterator i=res.begin();i!=res.end();++i) 
    tmp.push_back(*i);

  sort(tmp.begin(),tmp.end(),popisort);

  return tmp;
}

void StatBag::declareRing(const string &name, const string &help, unsigned int size)
{
  d_rings[name]=StatRing<string>(size);
  d_rings[name].setHelp(help);
}

void StatBag::declareComboRing(const string &name, const string &help, unsigned int size)
{
  d_comborings[name]=StatRing<SComboAddress>(size);
  d_comborings[name].setHelp(help);
}


vector<pair<string, unsigned int> > StatBag::getRing(const string &name)
{
  if(d_rings.count(name))
    return d_rings[name].get();
  else {
    typedef pair<SComboAddress, unsigned int> stor_t;
    vector<stor_t> raw =d_comborings[name].get();
    vector<pair<string, unsigned int> > ret;
    for(const stor_t& stor :  raw) {
      ret.push_back(make_pair(stor.first.ca.toString(), stor.second));
    }
    return ret;
  }
    
}

template<typename T, typename Comp>
void StatRing<T,Comp>::reset()
{
  Lock l(&d_lock);
  d_items.clear();
}

void StatBag::resetRing(const string &name)
{
  if(d_rings.count(name))
    d_rings[name].reset();
  else
    d_comborings[name].reset();
}

void StatBag::resizeRing(const string &name, unsigned int newsize)
{
  if(d_rings.count(name))
    d_rings[name].resize(newsize);
  else
    d_comborings[name].resize(newsize);
}


unsigned int StatBag::getRingSize(const string &name)
{
  if(d_rings.count(name))
    return d_rings[name].getSize();
  else
    return d_comborings[name].getSize();
}

string StatBag::getRingTitle(const string &name)
{
  if(d_rings.count(name))
    return d_rings[name].getHelp();
  else 
    return d_comborings[name].getHelp();
}

vector<string>StatBag::listRings()
{
  vector<string> ret;
  for(map<string,StatRing<string> >::const_iterator i=d_rings.begin();i!=d_rings.end();++i)
    ret.push_back(i->first);
  for(map<string,StatRing<SComboAddress> >::const_iterator i=d_comborings.begin();i!=d_comborings.end();++i)
    ret.push_back(i->first);

  return ret;
}

bool StatBag::ringExists(const string &name)
{
  return d_rings.count(name) || d_comborings.count(name);
}

template class StatRing<std::string>;
template class StatRing<SComboAddress>;
