/*
 * ActionManager.cpp
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "ActionManager.h"
#include <Net/FdManager.h>

#include <fcntl.h>
#include <signal.h>

#include <sigc++/adaptors/hide.h>

namespace Mad {
namespace Common {

ActionManager ActionManager::actionManager;


void ActionManager::doInit() {
  // TODO Error handling

  pipe(notifyPipe);

  fcntl(notifyPipe[0], F_SETFL, fcntl(notifyPipe[0], F_GETFL) | O_NONBLOCK);
  fcntl(notifyPipe[1], F_SETFL, fcntl(notifyPipe[1], F_GETFL) | O_NONBLOCK);

  Net::FdManager::get()->registerFd(notifyPipe[0], sigc::hide(sigc::mem_fun(this, &ActionManager::run)), POLLIN);
}

void ActionManager::doDeinit() {
  Net::FdManager::get()->unregisterFd(notifyPipe[0]);

  close(notifyPipe[0]);
  close(notifyPipe[1]);
}


void ActionManager::run() {
  // Empty pipe
  char buf[16];
  while(read(notifyPipe[0], buf, sizeof(buf)) > 0) {}

  while(true) {
    sigset_t set, oldset;
    sigfillset(&set);
    sigprocmask(SIG_SETMASK, &set, &oldset);

    if(actions.empty()) {
      sigprocmask(SIG_SETMASK, &oldset, 0);
      return;
    }

    sigc::slot<void> action = actions.front();
    actions.pop();

    sigprocmask(SIG_SETMASK, &oldset, 0);

    action();
  }
}

void ActionManager::add(const sigc::slot<void> &action) {
  sigset_t set, oldset;
  sigfillset(&set);
  sigprocmask(SIG_SETMASK, &set, &oldset);

  actions.push(action);
  write(notifyPipe[1], "", 1);

  sigprocmask(SIG_SETMASK, &oldset, 0);
}

}
}