/*
 * This file is a part of CMSLU -- Content Management System like Unix
 * and is not publicly distributed
 * 
 * Copyright (c) 2008, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#include "sessionmanager.h"


bool SessionManager::IsSession(long s)
{
	SessionTable::iterator i;
	
	Session temp;
	
	temp.id = s;
	
	i = session_table.find(temp);
	
	if( i == session_table.end() )
		return false;
	
	

return true;
}


long SessionManager::CreateSessionId()
{
long id;
	
	// make sure to call std::srand() somewhere at the beginning
	// id must be != 0 (0 is reserved)
	do
	{
		if( sizeof(long) == 8 )
		{
			id = ((unsigned long)std::rand()) << 32 + std::rand();
		}
		else
		{
			id = std::rand();
		}
		
		id += std::time(0);
		
		if( id < 0 )
			id = -id;
		
	}
	while( id == 0 ); // 0 reserved for a temporary session

	
return id;
}


void SessionManager::CreateTemporarySession()
{
Session s;
	
	s.id = 0;
	SessionTable::iterator i = session_table.find( s ); // looking for id=0
	
	if( i == session_table.end() )
	{
		std::pair<SessionTable::iterator,bool> res = session_table.insert(s);
		request.session = const_cast<Session*>( &(*res.first) );
	}
	else
	{
		request.session = const_cast<Session*>( &(*i) );
	}
}


void SessionManager::CreateSession()
{
Session s;
int attempts = 100;

	for( ; attempts > 0 ; --attempts )
	{
		s.id = CreateSessionId();
	
		std::pair<SessionTable::iterator,bool> res = session_table.insert(s);	

		if( res.second == true )
		{
			// the insertion took place
				
			request.session = const_cast<Session*>( &(*res.first) );
			request.SetCookie(data.http_session_id_name.c_str(), request.session->id);
			log << log2 << "SM: created a new session: " << s.id << logend;
				
		return;
		}
	}
	
	// there is a problem with generating a new session id
	// we do not set a session cookie
	CreateTemporarySession();
	log << log1 << "SM: cannot create a session id (temporary used: with id 0)" << logend;
}



void SessionManager::SetSession()
{
	CookieTable::iterator i = request.cookie_table.find(data.http_session_id_name);
	
	if( i == request.cookie_table.end() )
	{
		CreateSession();
	}
	else
	{
		Session temp;
		temp.id = atol(i->second.c_str());
		SessionTable::iterator s = session_table.find(temp);
	
		if( s != session_table.end() )
		{
			// that session is in the table
			request.session = const_cast<Session*>( &(*s) );
			
			log << log2 << "SM: session: " << s->id;
			
			if( request.session->puser )
				log << log2 << ", user: " << request.session->puser->name << ", id: " << request.session->puser->id;
				
			log << log2 << logend;
		}
		else
		{
			// there is no such a session
			// deleting the old cookie
			request.cookie_table.erase(i);

			// and creating a new one
			CreateSession();
		}
	}
	
	
	
	// request.session is set now
}