#include "TaskManager.h"

#include "common.h"

#include <time.h>

TaskManager::TaskManager()
 : _lastExecuted(0)
{
}
	
TaskManager::~TaskManager()
{	
	//delete any temporary tasks still in the list
	std::list<Task*>::iterator it;
	for (it = _temp_tasks.begin(); it != _temp_tasks.end(); ++it)
	{
		delete (*it);
	}
}


void TaskManager::LoadTasks()
{

	//print the loaded tasks
	std::map<std::string, Task*>::iterator it;	
	for(it = _tasks.begin(); it != _tasks.end(); ++it)
	{
		Task* tsk = (*it).second;
		if (tsk != 0)
			Common::instance()->logMessage( std::string("Loaded task \"") + tsk->GetName() + "\"" );
	}
}


void TaskManager::AddTask(Task* task)
{
	Common* cmn = Common::instance();

	if (task != 0)
	{
		std::string name = task->GetName();

		if ( _tasks[ name ] == 0)
			_tasks[ name ] = task;
		else
			cmn->logMessage( std::string("AddTask() -- already have a task called ") + name);
	}
	else
	{
		cmn->logMessage("AddTask() -- cannot register a null pointer");
	}
}

void TaskManager::AddTemporaryTask(Task* task)
{
	_temp_tasks.push_back(task);
}


void TaskManager::ExecuteTasks(IGsmModem& modem)
{
	const int SLEEP_TIME = 10; //wait at least 10 seconds between executions
	int now = time(0);

	if (now < (_lastExecuted + SLEEP_TIME) ) 
		return;

	_lastExecuted = now;

	//execute real tasks

	std::map<std::string, Task*>::iterator m_it;

	for (m_it = _tasks.begin(); m_it != _tasks.end(); ++m_it)
	{
		Task* tsk = (*m_it).second;
		tsk->ExecuteTask(modem);
	}

	//execute temporary tasks

	std::list<Task*>::iterator l_it;
	for (l_it = _temp_tasks.begin(); l_it != _temp_tasks.end(); ++l_it)
	{
		Task* tsk = (*l_it);
		tsk->ExecuteTask(modem);

		if ( tsk->IsFinished() )
		{
			delete tsk;
			l_it = _temp_tasks.erase(l_it); 
			
			//now l_it points to the next element in the list,
			//but since the for() loop will increment it before next iteration we will decrease it here
			--l_it; 
		}
	}


}


Task* TaskManager::GetTask(const std::string& taskname)
{
	return _tasks[ taskname ];
}