/*
 *  Baltisot
 *  Copyright (C) 1999-2007 Nicolas "Pixel" Noble
 *
 *  This program 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.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _WIN32
#include <sys/time.h>
#endif
#include <iostream>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "TaskMan.h"
#include "Task.h"
#include "BString.h"
#include "gettext.h"

Task::Task() : current(0), state(TASK_ON_HOLD), stopped(false), suspended(false), yielded(false), wbta(0), wta(0), BurstHandle(0) {
    TaskMan::AddTask(this);
}

Task::~Task() {
    TaskMan::RemoveFromWatches(this);
    TaskMan::RemoveTimeout(this);
    if (wbta)
        wbta->wta = 0;
    if (wta)
        wta->wbta = 0;
}

int Task::Do() throw (GeneralException) {
    return TASK_ON_HOLD;
}

int Task::Run() {
    if (TaskMan::Event() == Task::EVT_TASK)
        wta = 0;
    try {
	state = Do();
    }
    catch (TaskSwitch) {
	return state;
    }
    catch (GeneralException e) {
	std::cerr << _("Task ") << GetName() << _(" caused an unexpected exception: \"") << e.GetMsg() << _("\". Terminating.\n");
	state = TASK_DONE;
	return TASK_DONE;
    }
    
    return state;
}

int Task::DryRun() {
    while (state != TASK_DONE) {
	try {
	    state = Do();
	}
	catch (TaskSwitch) {
	}
	catch (GeneralException e) {
	    std::cerr << _("Task ") << GetName() << _(" caused an unexpected exception during dry-run: \"") << e.GetMsg() << _("\". Terminating.\n");
	    state = TASK_DONE;
	}
    }
    
    return state;
}

int Task::GetState() {
    return state;
}

String Task::GetName() {
    return _("Unknow Task");
}

void Task::Suspend(int newstate) throw (GeneralException) {
    if (newstate != -1) {
	state = newstate;
    }
    suspended = true;
    throw TaskSwitch();
}

void Task::WaitFor(Handle * h, int flags) {
    h->SetNonBlock();
    TaskMan::WaitFor(h, this, flags);
}

void Task::WaitFor(Task * t) {
    t->wbta = this;
    wta = t;
}

void Task::WaitFor(pid_t p) {
    TaskMan::WaitFor(p, this);
}

void Task::WaitFor(const timeval & t, int flags) {
    TaskMan::WaitFor(t, this, flags);
}

void Task::Yield() {
    yielded = true;
    Suspend(TASK_ON_HOLD);
}

bool Task::Yielded() {
    return yielded;
}

void Task::Unyield() {
    yielded = false;
    SetBurst();
}

void Task::SetBurst() {
    state = TASK_BURST;
}

void Task::Stop() {
    stopped = true;
}

void Task::Restart() {
    stopped = false;
}

bool Task::IsStopped() {
    return stopped;
}

Task * Task::WaitedBy() {
    return wbta;
}

void Task::RemoveFromWatches() {
    wbta = 0;
}

void Task::RemoveTimeout() {
    TaskMan::RemoveTimeout(this);
}