/* This file is (c) 2008-2012 Konstantin Isakov <ikm@goldendict.org>
 * Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */

#include <stdio.h>
#include <QIcon>
#include "gdappstyle.hh"
#include "mainwindow.hh"
#include "config.hh"
#include "article_netmgr.hh"
#include <QWebEngineProfile>
#include "processwrapper.hh"
#include "hotkeywrapper.hh"
#ifdef HAVE_X11
#include <fixx11h.h>
#endif

//#define __DO_DEBUG

#define LOG_TO_FILE_KEY "--log-to-file"

#ifdef Q_OS_WIN32
#include <QtCore/qt_windows.h>
#endif

#ifdef __DO_DEBUG
#include <sys/resource.h>
#endif

#include "termination.hh"
#include "atomic_rename.hh"


#include <QtWebEngineCore/QWebEngineUrlScheme>

#include <QMessageBox>
#include <QDebug>
#include <QFile>
#include <QByteArray>
#include <QString>

#include "gddebug.hh"

#if defined( Q_OS_MAC ) && QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
#include "lionsupport.h"
#endif

#if ( QT_VERSION >= QT_VERSION_CHECK( 5, 0, 0 ) )

void gdMessageHandler( QtMsgType type, const QMessageLogContext &context, const QString &mess )
{
  Q_UNUSED( context );
  QString message( mess );
  QByteArray msg = message.toUtf8().constData();

#else

void gdMessageHandler( QtMsgType type, const char *msg_ )
{
  QString message = QString::fromUtf8( msg_ );
  QByteArray msg = QByteArray::fromRawData( msg_, strlen( msg_ ) );

#endif

  switch (type) {

    case QtDebugMsg:
      if( logFilePtr && logFilePtr->isOpen() )
        message.insert( 0, "Debug: " );
      else
        fprintf(stderr, "Debug: %s\n", msg.constData());
      break;

    case QtWarningMsg:
      if( logFilePtr && logFilePtr->isOpen() )
        message.insert( 0, "Warning: " );
      else
        fprintf(stderr, "Warning: %s\n", msg.constData());
      break;

    case QtCriticalMsg:
      if( logFilePtr && logFilePtr->isOpen() )
        message.insert( 0, "Critical: " );
      else
        fprintf(stderr, "Critical: %s\n", msg.constData());
      break;

    case QtFatalMsg:
      if( logFilePtr && logFilePtr->isOpen() )
      {
        logFilePtr->write( "Fatal: " );
        logFilePtr->write( msg );
        logFilePtr->flush();
      }
      else
        fprintf(stderr, "Fatal: %s\n", msg.constData());
      abort();

#if QT_VERSION >= QT_VERSION_CHECK( 5, 5, 0 )
    case QtInfoMsg:
      if( logFilePtr && logFilePtr->isOpen() )
        message.insert( 0, "Info: " );
      else
        fprintf(stderr, "Info: %s\n", msg.constData());
      break;
#endif
  }

  if( logFilePtr && logFilePtr->isOpen() )
  {
    message.append( "\n" );
    logFilePtr->write( message.toUtf8() );
    logFilePtr->flush();
  }
}

class GDCommandLine
{
  bool crashReport, logFile;
  QString word, groupName, popupGroupName, errFileName;
  QVector< QString > arguments;
public:
  GDCommandLine( int argc, char **argv );

  inline bool needCrashReport()
  { return crashReport; }

  inline QString errorFileName()
  { return errFileName; }

  inline bool needSetGroup()
  { return !groupName.isEmpty(); }

  inline QString getGroupName()
  { return groupName; }

  inline bool needSetPopupGroup()
  { return !popupGroupName.isEmpty(); }

  inline QString getPopupGroupName()
  { return popupGroupName; }

  inline bool needLogFile()
  { return logFile; }

  inline bool needTranslateWord()
  { return !word.isEmpty(); }

  inline QString wordToTranslate()
  { return word; }
};

GDCommandLine::GDCommandLine( int argc, char **argv ):
crashReport( false ),
logFile( false )
{
  if( argc > 1 )
  {
#ifdef Q_OS_WIN32
    (void) argv;
    int num;
    LPWSTR *pstr = CommandLineToArgvW( GetCommandLineW(), &num );
    if( pstr && num > 1 )
    {
      for( int i = 1; i < num; i++ )
        arguments.push_back( QString::fromWCharArray( pstr[ i ] ) );
    }
#else
    for( int i = 1; i < argc; i++ )
      arguments.push_back( QString::fromLocal8Bit( argv[ i ] ) );
#endif
    // Parse command line
    for( int i = 0; i < arguments.size(); i++ )
    {
      if( arguments[ i ].compare( "--show-error-file" ) == 0 )
      {
        if( i < arguments.size() - 1 )
        {
          errFileName = arguments[ ++i ];
          crashReport = true;
        }
        continue;
      }
      else
      if( arguments[ i ].compare( "--log-to-file" ) == 0 )
      {
        logFile = true;
        continue;
      }
      else
      if( arguments[ i ].startsWith( "--group-name=" ) )
      {
        groupName = arguments[ i ].mid( arguments[ i ].indexOf( '=' ) + 1 );
        continue;
      }
      else
      if( arguments[ i ].startsWith( "--popup-group-name=" ) )
      {
        popupGroupName = arguments[ i ].mid( arguments[ i ].indexOf( '=' ) + 1 );
        continue;
      }
      else
        word = arguments[ i ];
    }
  }
}

class LogFilePtrGuard
{
  QFile logFile;
  Q_DISABLE_COPY( LogFilePtrGuard )  
public:
  LogFilePtrGuard() { logFilePtr = &logFile; }
  ~LogFilePtrGuard() { logFilePtr = 0; }
};

int main( int argc, char ** argv )
{
#ifdef Q_OS_UNIX
    // GoldenDict use lots of X11 functions and it currently cannot work
    // natively on Wayland. This workaround will force GoldenDict to use
    // XWayland.
    char * xdg_envc = getenv("XDG_SESSION_TYPE");
    QString xdg_session = xdg_envc ? QString::fromLatin1(xdg_envc) : QString();
    if (!QString::compare(xdg_session, QString("wayland"), Qt::CaseInsensitive))
    {
        setenv("QT_QPA_PLATFORM", "xcb", 1);
    }
#endif
  #ifdef Q_OS_MAC
    setenv("LANG", "en_US.UTF-8", 1);

  #endif

//  // The following clause fixes a race in the MinGW runtime where throwing
//  // exceptions for the first time in several threads simultaneously can cause
//  // an abort(). This code throws first exception in a safe, single-threaded
//  // manner, thus avoiding that race.
//  {
//    class Dummy {};

//    try
//    { throw Dummy(); }
//    catch( Dummy )
//    {}
//  }

#if defined( Q_OS_UNIX )
  setlocale( LC_ALL, "" ); // use correct char set mapping
#endif

  GDCommandLine gdcl( argc, argv );

  if ( gdcl.needCrashReport() )
  {
    // The program has crashed -- show a message about it

    QApplication app( argc, argv );

    QFile errFile( gdcl.errorFileName() );

    QString errorText;

    if ( errFile.open( QFile::ReadOnly ) )
      errorText = QString::fromUtf8( errFile.readAll() );

    errorText += "\n" + QString( "This information is located in file %1, "
                                 "which will be removed once you close this dialog.").arg( errFile.fileName() );

    QMessageBox::critical( 0, "GoldenDict has crashed", errorText );

    errFile.remove();

    return 0;
  }

  installTerminationHandler();

  #ifdef __DO_DEBUG
  {
    rlimit limit;

    memset( &limit, 0, sizeof( limit ) );
    limit.rlim_cur = RLIM_INFINITY;
    limit.rlim_max = RLIM_INFINITY;
    setrlimit( RLIMIT_CORE, &limit );
  }
  #endif

#ifdef __WIN32

  // Under Windows, increase the amount of fopen()-able file descriptors from
  // the default 512 up to 2048.
  _setmaxstdio( 2048 );

#endif



  QWebEngineUrlScheme webUiScheme("gdlookup");
  webUiScheme.setFlags(QWebEngineUrlScheme::SecureScheme |
                       QWebEngineUrlScheme::LocalScheme |
                       QWebEngineUrlScheme::LocalAccessAllowed);
  QWebEngineUrlScheme::registerScheme(webUiScheme);


  QWebEngineUrlScheme gico("gico");
  webUiScheme.setFlags(QWebEngineUrlScheme::SecureScheme |
                       QWebEngineUrlScheme::LocalScheme |
                       QWebEngineUrlScheme::LocalAccessAllowed);
  QWebEngineUrlScheme::registerScheme(gico);


  QHotkeyApplication app( "GoldenDict", argc, argv );
  LogFilePtrGuard logFilePtrGuard;

  if ( app.isRunning() )
  {
    bool wasMessage = false;

    if( gdcl.needSetGroup() )
    {
      app.sendMessage( QString( "setGroup: " ) + gdcl.getGroupName() );
      wasMessage = true;
    }

    if( gdcl.needSetPopupGroup() )
    {
      app.sendMessage( QString( "setPopupGroup: " ) + gdcl.getPopupGroupName() );
      wasMessage = true;
    }

    if( gdcl.needTranslateWord() )
    {
      app.sendMessage( QString( "translateWord: " ) + gdcl.wordToTranslate() );
      wasMessage = true;
    }

    if( !wasMessage )
      app.sendMessage("bringToFront");

    return 0; // Another instance is running
  }

  app.setApplicationName( "GoldenDict" );
  app.setOrganizationDomain( "http://goldendict.org/" );
#if QT_VERSION >= 0x040600
  app.setStyle(new GdAppStyle);
#endif

  #ifndef Q_OS_MAC
    app.setWindowIcon( QIcon( ":/icons/programicon.png" ) );
  #endif

#ifdef MAKE_CHINESE_CONVERSION_SUPPORT
  // OpenCC needs to load it's data files by relative path on Windows and OS X
  QDir::setCurrent( Config::getProgramDataDir() );
#endif

  // Load translations for system locale

  QTranslator qtTranslator;

  QString localeName = QLocale::system().name();

  if ( !qtTranslator.load( "qt_" + localeName, Config::getLocDir() ) )
    qtTranslator.load( "qt_" + localeName,
                       QLibraryInfo::location( QLibraryInfo::TranslationsPath ) );

  app.installTranslator( &qtTranslator );

  QTranslator translator;

  translator.load( Config::getLocDir() + "/" + localeName );

  app.installTranslator( &translator );

  Config::Class cfg;
  for( ; ; )
  {
    try
    {
      cfg = Config::load();
    }
    catch( Config::exError & )
    {
      QMessageBox mb( QMessageBox::Warning, app.applicationName(),
                      app.translate( "Main", "Error in configuration file. Continue with default settings?" ),
                      QMessageBox::Yes | QMessageBox::No );
      mb.exec();
      if( mb.result() != QMessageBox::Yes )
        return -1;

      QString configFile = Config::getConfigFileName();
      renameAtomically( configFile, configFile + ".bad" );
      continue;
    }
    break;
  }

  if( gdcl.needLogFile() )
  {
    // Open log file
    logFilePtr->setFileName( Config::getConfigDir() + "gd_log.txt" );
    logFilePtr->remove();
    logFilePtr->open( QFile::ReadWrite );

    // Write UTF-8 BOM
    QByteArray line;
    line.append( 0xEF ).append( 0xBB ).append( 0xBF );
    logFilePtr->write( line );

    // Install message handler
#if ( QT_VERSION >= QT_VERSION_CHECK( 5, 0, 0 ) )
    qInstallMessageHandler( gdMessageHandler );
#else
    qInstallMsgHandler( gdMessageHandler );
#endif
  }

  if ( Config::isPortableVersion() )
  {
    // For portable version, hardcode some settings

    cfg.paths.clear();
    cfg.paths.push_back( Config::Path( Config::getPortableVersionDictionaryDir(), true ) );
    cfg.soundDirs.clear();
    cfg.hunspell.dictionariesPath = Config::getPortableVersionMorphoDir();
  }

  // Reload translations for user selected locale is nesessary

  if( !cfg.preferences.interfaceLanguage.isEmpty() && localeName != cfg.preferences.interfaceLanguage )
  {
    localeName = cfg.preferences.interfaceLanguage;

    if ( !qtTranslator.load( "qt_" + localeName, Config::getLocDir() ) )
      qtTranslator.load( "qt_" + localeName,
                                 QLibraryInfo::location( QLibraryInfo::TranslationsPath ) );

    translator.load( Config::getLocDir() + "/" + localeName );
  }

  // Prevent app from quitting spontaneously when it works with scan popup
  // and with the main window closed.
  app.setQuitOnLastWindowClosed( false );



  MainWindow m( cfg );

  app.addDataCommiter( m );

  QObject::connect( &app, SIGNAL(messageReceived(const QString&)),
    &m, SLOT(messageFromAnotherInstanceReceived(const QString&)));

  if( gdcl.needSetGroup() )
    m.setGroupByName( gdcl.getGroupName(), true );

  if( gdcl.needSetPopupGroup() )
    m.setGroupByName( gdcl.getPopupGroupName(), false );

  if( gdcl.needTranslateWord() )
    m.wordReceived( gdcl.wordToTranslate() );

  int r = app.exec();

  app.removeDataCommiter( m );

  if( logFilePtr->isOpen() )
    logFilePtr->close();

  return r;
}