// src/backend/simulation.cc - Copyright 2005, 2006, University
//               of Padova, dept. of Pure and Applied
//               Mathematics
//
// This file is part of SGPEMv2.
//
// This 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; either version 2 of the License, or
// (at your option) any later version.
//
// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

#include "simulation.hh"

using namespace std;
using namespace sgpem;
using namespace memory;
using Glib::usleep;

Simulation::Simulation(): _state(state_paused), _mode(true), _timer_interval(1000)
{
}

void 
Simulation::set_timer(const int& t)
{
	_timer_interval = t;
}

int 
Simulation::get_timer() const
{
	return _timer_interval;
}

void 	
Simulation::set_mode(const bool& b)
{
	_mode = b;
}

bool
Simulation::get_mode() const
{
	return _mode;
}

void
Simulation::pause()
{
	_state = state_paused;
}

void
Simulation::stop()
{
	_state = state_stopped;
}

void
Simulation::reset()
{
	_state = state_paused;
	History::get_instance().truncate_at(0);
}

void
Simulation::run()
{
	History& h = History::get_instance();
	
	if (_state == state_stopped)
		h.truncate_at(0);	
	
	_state = state_running;
	
	//*******  CONTINUOUS TIME
	
	if (_mode)
	{	
loop:			
		// chech for termination
		bool all_term = true;
		smart_ptr<SchedulableList> left = h.get_simulation_status_at(h.get_current_time());
		for(uint i = 0; i < left->size(); i++)
			if (left->get_item_at(i)->get_state() != SchedulableStatus::state_terminated)
			{
				all_term = false;
				break;
			}
		
		//if there are no processes left the termination message has already been notified
		//by the last execution of upadate()
		if (all_term)
		{
			_state = state_paused;
			return;
		}
		
		//step forward
		Scheduler::get_instance().step_forward();
		
		//sleep
		Glib::usleep(_timer_interval*1000);
		
		//check the state
		if (_state == state_stopped || _state == state_paused)
			return;
		
		goto loop;		
	}
	
	//******* STEP by STEP
	else
	{
		// chech for termination
		bool all_term = true;
		smart_ptr<SchedulableList> left = h.get_simulation_status_at(h.get_current_time());
		for(uint i = 0; i < left->size(); i++)
			if (left->get_item_at(i)->get_state() != SchedulableStatus::state_terminated)
		{
			all_term = false;
			break;
		}
		
		if (all_term)
			//if there are no processes left the termination message has already been notified
			//by the last execution of upadate()
			_state = state_paused;
		else
			//step forward
			Scheduler::get_instance().step_forward();		
	}
	
}


void
Simulation::jump_to(const uint& where)
{
	//jump to position 0
	reset();
	bool old = _mode;
	_mode = false;
	
	// executes "where" steps
	for (uint i=0; i < where; i++)
		run();
	
	_state = state_paused;
	_mode = old;
}

/*void
Simulation::set_policy(Policy* p)
{
	Scheduler::get_instance().set_policy(p);
	}*/


Policy*
Simulation::get_policy()
{
	return &Scheduler::get_instance().get_policy();
}

vector<Policy*>
Simulation::get_avaiable_policies()
{
	vector<Policy*> v;
	v.push_back(&Scheduler::get_instance().get_policy());
	return v;
}