/*
 * 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 <QMessageBox>
#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 <iostream>
#include <stdio.h>
#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

class UsageDisplay: public QObject {
  Q_OBJECT

public:
  static void displayUsage(char* prg_name) {
    std::cout << tr("Usage:").toLocal8Bit().data() << std::endl;
    std::cout << '\t' << prg_name << "--version: " << tr("displays program version").toLocal8Bit().data() << std::endl;
#ifndef DISABLE_GUI
    std::cout << '\t' << prg_name << "--no-splash: " << tr("disable splash screen").toLocal8Bit().data() << std::endl;
#endif
    std::cout << '\t' << prg_name << "--help: " << tr("displays this help message").toLocal8Bit().data() << std::endl;
    std::cout << '\t' << prg_name << "--webui-port=x: " << tr("changes the webui port (current: %1)").arg(QString::number(Preferences::getWebUiPort())).toLocal8Bit().data() << std::endl;
    std::cout << '\t' << prg_name << tr("[files or urls]: downloads the torrents passed by the user (optional)").toLocal8Bit().data() << std::endl;
  }
};

class LegalNotice: public QObject {
  Q_OBJECT

public:
  static bool userAgreesWithNotice() {
    QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
    if(settings.value(QString::fromUtf8("LegalNotice/Accepted"), false).toBool()) // Already accepted once
      return true;
#ifdef DISABLE_GUI
    std::cout << std::endl << "*** " << tr("Legal Notice").toLocal8Bit().data() << " ***" << std::endl;
    std::cout << tr("qBittorrent is a file sharing program. When you run a torrent, its data will be made available to others by mean of upload. And of course, any content you share if your sole responsatibility.\n\nYou probably knew this, so we won't tell you again.").toLocal8Bit().data() << std::endl << std::endl;
    std::cout << tr("Press any key to accept and continue...").toLocal8Bit().data() << std::endl;
    getchar(); // Read pressed key
    // Save the answer
    settings.setValue(QString::fromUtf8("LegalNotice/Accepted"), true);
    return true;
#else
    QMessageBox msgBox;
    msgBox.setText(tr("qBittorrent is a file sharing program. When you run a torrent, its data will be made available to others by mean of upload. And of course, any content you share if your sole responsatibility.\n\nYou probably knew this, so we won't tell you again."));
    msgBox.setWindowTitle(tr("Legal notice"));
    msgBox.addButton(tr("Cancel"), QMessageBox::RejectRole);
    QAbstractButton *agree_button =(QAbstractButton*)msgBox.addButton(tr("I Agree"), QMessageBox::AcceptRole);
    msgBox.exec();
    if(msgBox.clickedButton() == agree_button) {
      // Save the answer
      settings.setValue(QString::fromUtf8("LegalNotice/Accepted"), true);
      return true;
    }
    return false;
#endif
  }
};

#include "main.moc"

#ifndef Q_WS_WIN
void sigintHandler(int) {
  signal(SIGINT, 0);
  qDebug("Catching SIGINT, exiting cleanly");
  app->exit();
}

void sigtermHandler(int) {
  signal(SIGTERM, 0);
  qDebug("Catching SIGTERM, exiting cleanly");
  app->exit();
}
void sigsegvHandler(int) {
  signal(SIGABRT, 0);
  signal(SIGSEGV, 0);
  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) {
  signal(SIGABRT, 0);
  signal(SIGSEGV, 0);
  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")){
      UsageDisplay::displayUsage(argv[0]);
      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"));
  if(!LegalNotice::userAgreesWithNotice()) {
#ifndef DISABLE_GUI
    delete splash;
#endif
    delete app;
    return 0;
  }
#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;
}