/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2008-2010, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#include "sessioncontainer.h"
#include "log.h"
#include "misc.h"



SessionContainer::SessionContainer()
{
	request = 0;
	table_size = 0;
}




void SessionContainer::SetRequest(Request * prequest)
{
	request = prequest;
}



void SessionContainer::Clear()
{
Table::iterator inext, i = table.begin();

	// don't use table.clear();
	// because plugins session data would not be erased
	while( i != table.end() )
	{
		inext = i;
		++inext;

		request->session = &(*i);
		table.erase(i);

		i = inext;
	}

	// erasing all indexes
	index_id.clear();
	index_time.clear();	
	table_size = 0;
	request->session = 0;
}


void SessionContainer::SetLastContainer(LastContainer * plast_container)
{
	last_container = plast_container;
}


SessionContainer::TableSize SessionContainer::Size()
{
	// don't use table.size() as it has O(n) complexity on FreeBSD
	return table_size;
}


SessionContainer::Iterator SessionContainer::Begin()
{
	return table.begin();
}


SessionContainer::Iterator SessionContainer::End()
{
	return table.end();
}


Session & SessionContainer::Back()
{
	return table.back();	
}



bool SessionContainer::PushBack(const Session & session)
{
	if( index_id.find(session.id) != index_id.end() )
		// that element already exists
		return false;
	
	Iterator last = table.insert(table.end(), session);
	index_id.insert( std::make_pair(session.id, last) );	
	index_time.insert( std::make_pair(session.last_time, last) );
	table_size += 1;

	log << log3 << "SC: added session, id: " << session.id << logend;

return true;
}




SessionContainer::Iterator SessionContainer::FindById(long id)
{
IndexId::iterator i;

	i = index_id.find(id);
	
	if( i == index_id.end() )
		return table.end();
		
return i->second;
}



void SessionContainer::DelFirstByTimeInterval(time_t interval, bool skip_remember_flag)
{
IndexTime::iterator i = index_time.begin();
IndexTime::iterator iold;
time_t limit = std::time(0) - interval;
Session * old_session = request->session;

	while( i != index_time.end() && i->second->last_time < limit )
	{
		long id = i->second->id;
		iold = i;
		++i; // incrementing before deleting old one
		
		if( skip_remember_flag && iold->second->puser && iold->second->remember_me )
			// don't delete sessions which have 'remember_me' flag (and a user is logged)
			continue;

		if( iold->second->puser )
			last_container->UserLogout(iold->second->puser->id, iold->second->id);
		
		// we're logging session.id (call this before table.erase())
		DelFromIdIndex(iold->second);

		request->session = &(*iold->second);
		table.erase(iold->second);
		index_time.erase(iold);
		table_size -= 1;
		request->session = 0;

		log << log3 << "SC: deleted index_time for session id: " << id << logend;
		log << log3 << "SC: deleted session, id: " << id << logend;
	}

	request->session = old_session;
}


void SessionContainer::DelFromIdIndex(SessionContainer::Iterator iter)
{
IndexId::iterator i;
	
	for(i = index_id.begin() ; i!=index_id.end() ; ++i)
	{
		if( i->second == iter )
		{
			index_id.erase(i);
			log << log3 << "SC: deleted index_id for session id: " << iter->id << logend;

			break;	
		}
	}
}




void SessionContainer::UpdateLastTime(SessionContainer::Iterator iter, time_t new_time)
{
	IndexTime::iterator i = index_time.lower_bound(iter->last_time);
	bool found = false;

	for( ; i != index_time.end() ; ++i)
	{
		if( i->second == iter )
		{
			index_time.erase(i);
			index_time.insert( std::make_pair(new_time, iter) );
			
			iter->last_time = new_time;
			iter->tm_last_time = Time(new_time);
			
			log << log3 << "SC: last time and the time index for session id: " << iter->id << " updated" << logend;
			found = true;
			break;
		}
	}

	
	if( !found )
		log << log1 << "SC: cannot update the time, time index not found for session id: " << iter->id << logend;
}