/*
 * Bittorrent Client using Qt4 and libtorrent.
 * Copyright (C) 2006  Christophe Dumez
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 *
 * Contact : chris@qbittorrent.org
 */

#include <QLocale>
#include <QTranslator>
#include <QFile>

#ifndef DISABLE_GUI
#include <QApplication>
#include <QSplashScreen>
#include <QPlastiqueStyle>
#include "qgnomelook.h"
#include <QMotifStyle>
#include <QCDEStyle>
#ifdef Q_WS_WIN
#include <QWindowsXPStyle>
#endif
#ifdef Q_WS_MAC
#include <QMacStyle>
#endif
#include "GUI.h"
#include "ico.h"
#else
#include <QCoreApplication>
#include "headlessloader.h"
#endif

#include <QSettings>
#include <QLocalSocket>
#include <unistd.h>
#include <sys/types.h>
#ifndef Q_WS_WIN
#include <signal.h>
#include <execinfo.h>
#include "stacktrace.h"
#endif

#include <stdlib.h>
#include "misc.h"
#include "preferences.h"

#ifdef DISABLE_GUI
QCoreApplication *app;
#else
QApplication *app;
#endif

#ifndef Q_WS_WIN
void sigintHandler(int) {
  qDebug("Catching SIGINT, exiting cleanly");
  app->exit();
}

void sigtermHandler(int) {
  qDebug("Catching SIGTERM, exiting cleanly");
  app->exit();
}
void sigsegvHandler(int) {
  std::cerr << "\n\n*************************************************************\n";
  std::cerr << "Catching SIGSEGV, please report a bug at http://bug.qbittorrent.org\nand provide the following backtrace:\n";
  print_stacktrace();
  std::raise(SIGINT);
  std::abort();
}
void sigabrtHandler(int) {
  std::cerr << "\n\n*************************************************************\n";
  std::cerr << "Catching SIGABRT, please report a bug at http://bug.qbittorrent.org\nand provide the following backtrace:\n";
  print_stacktrace();
  std::raise(SIGINT);
  std::abort();
}
#endif

#ifndef DISABLE_GUI
void useStyle(QApplication *app, int style){
  switch(style) {
  case 1:
    app->setStyle(new QPlastiqueStyle());
    break;
  case 2:
    app->setStyle(new QGnomeLookStyle());
    break;
  case 3:
    app->setStyle(new QMotifStyle());
    break;
  case 4:
    app->setStyle(new QCDEStyle());
    break;
#ifdef Q_WS_MAC
  case 5:
    app->setStyle(new QMacStyle());
    break;
#endif
#ifdef Q_WS_WIN
  case 6:
    app->setStyle(new QWindowsXPStyle());
    break;
#endif
  default:
    if(app->style()->objectName() == "cleanlooks") {
      // Force our own cleanlooks style
      qDebug("Forcing our own cleanlooks style");
      app->setStyle(new QGnomeLookStyle());
    }
  }
}
#endif

// Main
int main(int argc, char *argv[]){
  QFile file;
  QString locale;
  QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
#ifndef DISABLE_GUI
  bool no_splash = false;
#endif
  if(argc > 1){
    if(QString::fromUtf8(argv[1]) == QString::fromUtf8("--version")){
      std::cout << "qBittorrent " << VERSION << '\n';
      return 0;
    }
    if(QString::fromUtf8(argv[1]) == QString::fromUtf8("--help")){
      std::cout << "Usage: \n";
      std::cout << '\t' << argv[0] << " --version : displays program version\n";
#ifndef DISABLE_GUI
      std::cout << '\t' << argv[0] << " --no-splash : disable splash screen\n";
#endif
      std::cout << '\t' << argv[0] << " --help : displays this help message\n";
      std::cout << '\t' << argv[0] << " --webui-port=x : changes the webui port (default: 8080)\n";
      std::cout << '\t' << argv[0] << " [files or urls] : starts program and download given parameters (optional)\n";
      return 0;
    }

    for(int i=1; i<argc; ++i) {
#ifndef DISABLE_GUI
      if(QString::fromUtf8(argv[i]) == QString::fromUtf8("--no-splash")) {
        no_splash = true;
      } else {
#endif
        if(QString::fromUtf8(argv[i]).startsWith("--webui-port=")) {
          QStringList parts = QString::fromUtf8(argv[i]).split("=");
          if(parts.size() == 2) {
            bool ok = false;
            int new_port = parts.last().toInt(&ok);
            if(ok && new_port > 1024 && new_port <= 65535) {
              Preferences::setWebUiPort(new_port);
            }
          }
        }
#ifndef DISABLE_GUI
      }
#endif
    }
  }

#ifndef DISABLE_GUI
  if(settings.value(QString::fromUtf8("Preferences/General/NoSplashScreen"), false).toBool()) {
    no_splash = true;
  }
#endif
  // Set environment variable
  if(putenv((char*)"QBITTORRENT="VERSION)) {
    std::cerr << "Couldn't set environment variable...\n";
  }
  //Check if there is another instance running
  QLocalSocket localSocket;
  QString uid = QString::number(getuid());
  localSocket.connectToServer("qBittorrent-"+uid, QIODevice::WriteOnly);
  if (localSocket.waitForConnected(1000)){
    std::cout << "Another qBittorrent instance is already running...\n";
    // Send parameters
    if(argc > 1){
      QStringList params;
      for(int i=1;i<argc;++i){
        params << QString::fromLocal8Bit(argv[i]);
        std::cout << argv[i] << '\n';
      }
      QByteArray block = params.join("\n").toLocal8Bit();
      std::cout << "writting: " << block.data() << '\n';
      std::cout << "size: " << block.size() << '\n';
      uint val = localSocket.write(block);
      if(localSocket.waitForBytesWritten(5000)){
        std::cout << "written(" <<val<<"): " << block.data() << '\n';
      }else{
        std::cerr << "Writing to the socket timed out\n";
      }
      localSocket.disconnectFromServer();
      std::cout << "disconnected\n";
    }
    localSocket.close();
    return 0;
  }
#ifdef DISABLE_GUI
  app = new QCoreApplication(argc, argv);
#else
  app = new QApplication(argc, argv);
#endif
#ifndef DISABLE_GUI
  useStyle(app, settings.value("Preferences/General/Style", 0).toInt());
  app->setStyleSheet("QStatusBar::item { border-width: 0; }");
  QSplashScreen *splash = 0;
  if(!no_splash) {
    splash = new QSplashScreen(QPixmap(QString::fromUtf8(":/Icons/skin/splash.png")));
    splash->show();
  }
#endif
  // Open options file to read locale
  locale = settings.value(QString::fromUtf8("Preferences/General/Locale"), QString()).toString();
  QTranslator translator;
  if(locale.isEmpty()){
    locale = QLocale::system().name();
    settings.setValue(QString::fromUtf8("Preferences/General/Locale"), locale);
  }
  if(translator.load(QString::fromUtf8(":/lang/qbittorrent_") + locale)){
    qDebug("%s locale recognized, using translation.", (const char*)locale.toLocal8Bit());
  }else{
    qDebug("%s locale unrecognized, using default (en_GB).", (const char*)locale.toLocal8Bit());
  }
  app->installTranslator(&translator);
  app->setApplicationName(QString::fromUtf8("qBittorrent"));
#ifndef DISABLE_GUI
  app->setQuitOnLastWindowClosed(false);
#endif
#ifndef Q_WS_WIN
  signal(SIGABRT, sigabrtHandler);
  signal(SIGTERM, sigtermHandler);
  signal(SIGINT, sigintHandler);
  signal(SIGSEGV, sigsegvHandler);
#endif
  // Read torrents given on command line
  QStringList torrentCmdLine = app->arguments();
  // Remove first argument (program name)
  torrentCmdLine.removeFirst();
#ifndef DISABLE_GUI
  GUI *window = new GUI(0, torrentCmdLine);
  if(!no_splash) {
    splash->finish(window);
    delete splash;
  }
#else
  // Load Headless class
  HeadlessLoader *loader = new HeadlessLoader(torrentCmdLine);
#endif
  int ret =  app->exec();

#ifndef Q_WS_WIN
  // Application has exited, stop catching SIGINT and SIGTERM
  signal(SIGINT, 0);
  signal(SIGTERM, 0);
#endif

#ifndef DISABLE_GUI
  delete window;
  qDebug("GUI was deleted!");
#else
  delete loader;
#endif
  qDebug("Deleting app...");
  delete app;
  qDebug("App was deleted! All good.");
  return ret;
}