/*
 * Copyright (C) by Klaas Freitag <freitag@owncloud.com>
 *
 * 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.
 */

#include "mirall/mirallconfigfile.h"
#include "mirall/owncloudtheme.h"
#include "mirall/miralltheme.h"

#include <QtCore>
#include <QtGui>

#ifdef Q_WS_WIN
#include <sys/types.h>
#include <sys/stat.h>

#include <windef.h>
#include <winbase.h>
#endif

#ifdef Q_OS_MAC 
#include <mach-o/dyld.h>
#endif

#define DEFAULT_REMOTE_POLL_INTERVAL 30000 // default remote poll time in milliseconds
#define DEFAULT_LOCAL_POLL_INTERVAL  10000 // default local poll time in milliseconds
#define DEFAULT_POLL_TIMER_EXEED     10

#define OC_ORGANIZATION QLatin1String("ownCloud")
#define OC_APPLICATION  QLatin1String("ownCloudClient")

namespace Mirall {

QString MirallConfigFile::_passwd;
QString MirallConfigFile::_oCVersion;
bool    MirallConfigFile::_askedUser = false;

MirallConfigFile::MirallConfigFile( const QString& appendix )
    :_customHandle(appendix)
{
}

QString MirallConfigFile::configPath() const
{
    QString dir = QDesktopServices::storageLocation(QDesktopServices::DataLocation);
    if( !dir.endsWith('/') ) dir.append('/');
    return dir;
}

QString MirallConfigFile::excludeFile() const
{
    const QString exclFile("exclude.lst");
    QString dir = configPath();
    dir += exclFile;

    QFileInfo fi( dir );
    if( fi.isReadable() ) {
        return dir;
    }
    // Check alternative places...
#ifdef Q_OS_WIN32
    /* For win32, try to copy the conf file from the directory from where the app was started. */
    char buf[MAX_PATH+1];
    int  len = 0;

    /* Get the path from where the application was started */
    len = GetModuleFileName(NULL, buf, MAX_PATH);
    QString exePath = QString::fromLocal8Bit(buf);
    exePath.remove("owncloud.exe");
    fi.setFile(exePath, exclFile );
#endif
#ifdef Q_OS_LINUX
    fi.setFile( QString("/etc"), exclFile );
#endif
#ifdef Q_OS_MAC
    char buf[1024];
    uint32_t size = sizeof(buf);
    if (_NSGetExecutablePath(buf, &size) == 0) {
      qDebug() << "  Executable path: <" << buf;
      QString execFile = QString::fromLocal8Bit(buf);
      QFileInfo fi2(execFile);
      fi.setFile( fi2.canonicalPath(), "../Resources/exclude.lst");
    }
#endif
    if( fi.isReadable() ) {
        qDebug() << "  ==> returning exclude file path: " << fi.absoluteFilePath();
        return fi.absoluteFilePath();
    }
    qDebug() << "EMPTY exclude file path!";
    return QString();
}

QString MirallConfigFile::configFile() const
{
#ifdef OWNCLOUD_CLIENT
    ownCloudTheme theme;
#else
    mirallTheme theme;
#endif
    if( qApp->applicationName().isEmpty() ) {
        qApp->setApplicationName( theme.appName() );
    }
    QString dir = configPath() + theme.configFileName();
    if( !_customHandle.isEmpty() ) {
        dir.append( QChar('_'));
        dir.append( _customHandle );
        qDebug() << "  OO Custom config file in use: " << dir;
    }
    return dir;
}

bool MirallConfigFile::exists()
{
    QFile file( configFile() );
    return file.exists();
}

QString MirallConfigFile::defaultConnection() const
{
    return QString::fromLocal8Bit("ownCloud");
}

bool MirallConfigFile::connectionExists( const QString& conn )
{
    QString con = conn;
    if( conn.isEmpty() ) con = defaultConnection();

    QSettings settings( configFile(), QSettings::IniFormat);
    settings.setIniCodec( "UTF-8" );

    return settings.contains( QString("%1/url").arg( conn ) );
}


void MirallConfigFile::writeOwncloudConfig( const QString& connection,
                                            const QString& url,
                                            const QString& user,
                                            const QString& passwd,
                                            bool skipPwd )
{
    const QString file = configFile();
    qDebug() << "*** writing mirall config to " << file << " Skippwd: " << skipPwd;
    QString pwd( passwd );

    QSettings settings( file, QSettings::IniFormat);
    settings.setIniCodec( "UTF-8" );
    QString cloudsUrl( url );

    if( !cloudsUrl.startsWith( QLatin1String("http")) )
        cloudsUrl.prepend(QLatin1String("http://"));

    settings.beginGroup( connection );
    settings.setValue("url", cloudsUrl );
    settings.setValue("user", user );
    if( skipPwd ) {
        pwd.clear();
    }

    QByteArray pwdba = pwd.toUtf8();
    settings.setValue( "passwd", QVariant(pwdba.toBase64()) );
    settings.setValue( "nostoredpassword", QVariant(skipPwd) );
    settings.sync();

    // check the perms, only read-write for the owner.
    QFile::setPermissions( file, QFile::ReadOwner|QFile::WriteOwner );

}

void MirallConfigFile::removeConnection( const QString& connection )
{
    QString con( connection );
    if( connection.isEmpty() ) con = defaultConnection();

    qDebug() << "    removing the config file for connection " << con;

    // Currently its just removing the entire config file
    QSettings settings( configFile(), QSettings::IniFormat);
    settings.setIniCodec( "UTF-8" );
    settings.beginGroup( con );
    settings.remove("");  // removes all content from the group
    settings.sync();
}

/*
 * returns the configured owncloud url if its already configured, otherwise an empty
 * string.
 * The returned url always has a trailing hash.
 * If webdav is true, the webdav-server url is returned.
 */
QString MirallConfigFile::ownCloudUrl( const QString& connection, bool webdav ) const
{
    QString con( connection );
    if( connection.isEmpty() ) con = defaultConnection();

    QSettings settings( configFile(), QSettings::IniFormat );
    settings.setIniCodec( "UTF-8" );
    settings.beginGroup( con );

    // For the WebDAV connect it is required to know which version the server is running
    // because the url changed :-/
    if( webdav && _oCVersion.isEmpty() ) {
        qDebug() << "######## Config does not yet know the ownCloud server version #########";
        qDebug() << "###################### THIS SHOULD NOT HAPPEN! ########################";
    }

    QString url = settings.value( "url" ).toString();
    if( ! url.isEmpty() ) {
        if( ! url.endsWith('/')) url.append('/');
        if( webdav ) url.append( "files/webdav.php/" );
    }

    // qDebug() << "Returning configured owncloud url: " << url;

  return url;
}

QString MirallConfigFile::ownCloudUser( const QString& connection ) const
{
    QString con( connection );
    if( connection.isEmpty() ) con = defaultConnection();

    QSettings settings( configFile(), QSettings::IniFormat );
    settings.setIniCodec( "UTF-8" );
    settings.beginGroup( con );

    QString user = settings.value( "user" ).toString();
    // qDebug() << "Returning configured owncloud user: " << user;

    return user;
}

int MirallConfigFile::remotePollInterval( const QString& connection ) const
{
  QString con( connection );
  if( connection.isEmpty() ) con = defaultConnection();

  QSettings settings( configFile(), QSettings::IniFormat );
  settings.setIniCodec( "UTF-8" );
  settings.beginGroup( con );

  int remoteInterval = settings.value( "remotePollInterval", DEFAULT_REMOTE_POLL_INTERVAL ).toInt();
  int localInterval  = settings.value("localPollInterval", DEFAULT_LOCAL_POLL_INTERVAL ).toInt();
  if( remoteInterval < 2*localInterval ) {
    qDebug() << "WARN: remote poll Interval should at least be twice as local poll interval!";
  }
  if( remoteInterval < 5000 || remoteInterval < localInterval ) {
    qDebug() << "Remote Interval is smaller than local Interval";
    remoteInterval = DEFAULT_REMOTE_POLL_INTERVAL;
  }
  return remoteInterval;
}

int MirallConfigFile::localPollInterval( const QString& connection ) const
{
  QString con( connection );
  if( connection.isEmpty() ) con = defaultConnection();

  QSettings settings( configFile(), QSettings::IniFormat );
  settings.setIniCodec( "UTF-8" );
  settings.beginGroup( con );

  int remoteInterval = settings.value( "remotePollInterval", DEFAULT_REMOTE_POLL_INTERVAL ).toInt();
  int localInterval  = settings.value("localPollInterval", DEFAULT_LOCAL_POLL_INTERVAL ).toInt();
  if( remoteInterval < 2*localInterval ) {
    qDebug() << "WARN: remote poll Interval should at least be twice as local poll interval!";
  }
  if( localInterval < 2500 || remoteInterval < localInterval ) {
    qDebug() << "Remote Interval is smaller than local Interval";
    localInterval = DEFAULT_LOCAL_POLL_INTERVAL;
  }
  return localInterval;
}

int MirallConfigFile::pollTimerExceedFactor( const QString& connection ) const
{
  QString con( connection );
  if( connection.isEmpty() ) con = defaultConnection();

  QSettings settings( configFile(), QSettings::IniFormat );
  settings.setIniCodec( "UTF-8" );
  settings.beginGroup( con );

  int pte = settings.value( "pollTimerExeedFactor", DEFAULT_POLL_TIMER_EXEED).toInt();

  if( pte < 1 ) pte = DEFAULT_POLL_TIMER_EXEED;

  return pte;
}

QString MirallConfigFile::ownCloudPasswd( const QString& connection ) const
{
    QString con( connection );
    if( connection.isEmpty() ) con = defaultConnection();

    QSettings settings( configFile(), QSettings::IniFormat );
    settings.setIniCodec( "UTF-8" );
    settings.beginGroup( con );

    QString pwd;

    bool boolfalse( false );
    bool skipPwd = settings.value( "nostoredpassword", QVariant(boolfalse) ).toBool();
    if( skipPwd ) {
        if( ! _askedUser ) {
            bool ok;
            QString text = QInputDialog::getText(0, QObject::tr("ownCloud Password Required"),
                                                 QObject::tr("Please enter your ownCloud password:"), QLineEdit::Password,
                                                 QString(), &ok);
            if( ok && !text.isEmpty() ) { // empty password is not allowed on ownCloud
                _passwd = text;
                _askedUser = true;
            }
        }
        pwd = _passwd;
    } else {
        QByteArray pwdba = settings.value("passwd").toByteArray();
        if( pwdba.isEmpty() ) {
            // check the password entry, cleartext from before
            // read it and convert to base64, delete the cleartext entry.
            QString p = settings.value("password").toString();

            if( ! p.isEmpty() ) {
                // its there, save base64-encoded and delete.

                pwdba = p.toUtf8();
                settings.setValue( "passwd", QVariant(pwdba.toBase64()) );
                settings.remove( "password" );
                settings.sync();
            }
        }
        pwd = QString::fromUtf8( QByteArray::fromBase64(pwdba) );
    }

    return pwd;
}

QString MirallConfigFile::ownCloudVersion() const
{
    return _oCVersion;
}

void MirallConfigFile::setOwnCloudVersion( const QString& ver)
{
    qDebug() << "** Setting ownCloud Server version to " << ver;
    _oCVersion = ver;
}


bool MirallConfigFile::ownCloudSkipUpdateCheck( const QString& connection ) const
{
    QString con( connection );
    if( connection.isEmpty() ) con = defaultConnection();

    QSettings settings( configFile(), QSettings::IniFormat );
    settings.setIniCodec( "UTF-8" );
    settings.beginGroup( con );

    bool skipIt = settings.value( "skipUpdateCheck", false ).toBool();

    return skipIt;
}

int MirallConfigFile::maxLogLines() const
{
    QSettings settings( configFile(), QSettings::IniFormat );
    settings.setIniCodec( "UTF-8" );
    settings.beginGroup("Logging");
    int logLines = settings.value( "maxLogLines", 20000 ).toInt();
    return logLines;
}

QByteArray MirallConfigFile::basicAuthHeader() const
{
    QString concatenated = ownCloudUser() + QChar(':') + ownCloudPasswd();
    const QString b("Basic ");
    QByteArray data = b.toLocal8Bit() + concatenated.toLocal8Bit().toBase64();

    return data;
}

// remove a custom config file.
void MirallConfigFile::cleanupCustomConfig()
{
    if( _customHandle.isEmpty() ) {
        qDebug() << "SKipping to erase the main configuration.";
        return;
    }
    QString file = configFile();
    if( QFile::exists( file ) ) {
        QFile::remove( file );
    }
}

// accept a config identified by the customHandle as general config.
void MirallConfigFile::acceptCustomConfig()
{
    if( _customHandle.isEmpty() ) {
        qDebug() << "WRN: Custom Handle is empty. Can not accept.";
        return;
    }

    QString srcConfig = configFile(); // this considers the custom handle
    _customHandle.clear();
    QString targetConfig = configFile();
    QString targetBak = targetConfig + QLatin1String(".bak");

    bool bakOk = false;
    // remove an evtl existing old config backup.
    if( QFile::exists( targetBak ) ) {
        QFile::remove( targetBak );
    }
    // create a backup of the current config.
    bakOk = QFile::rename( targetConfig, targetBak );

    // move the custom config to the master place.
    if( ! QFile::rename( srcConfig, targetConfig ) ) {
        // if the move from custom to master failed, put old backup back.
        if( bakOk ) {
            QFile::rename( targetBak, targetConfig );
        }
    }
    QFile::remove( targetBak );
}

QVariant MirallConfigFile::customMedia( customMediaType type )
{
    QVariant re;
    QString key;

    if( type == oCSetupTop ) {
        key = QLatin1String("oCSetupTop");
    } else if( type == oCSetupSide ) {
        key = QLatin1String("oCSetupSide");
    } else if( type == oCSetupBottom) {
        key = QLatin1String("oCSetupBottom");
    } else if( type == oCSetupFixUrl ) {
        key = QLatin1String("oCSetupFixUrl");
    } else if( type == oCSetupResultTop ) {
        key = QLatin1String("oCSetupResultTop");
    } else {
        qDebug() << "Wrong media type.";
    }

    if( !key.isEmpty() ) {
        QSettings settings( QSettings::IniFormat, QSettings::SystemScope, OC_ORGANIZATION, OC_APPLICATION );
        QString cfg = settings.fileName();
        qDebug() << "Trying to read config ini file at " << cfg;

        settings.setIniCodec( "UTF-8" );
        settings.beginGroup(QLatin1String("GUICustomize"));
        QString val = settings.value( key, QString() ).toString();

        if( !val.isEmpty() ) {
            QPixmap pix( val );
            if( pix.isNull() ) {
                // pixmap loading hasn't succeeded. We take the text instead.
                re.setValue( val );
            } else {
                re.setValue( pix );
            }
        }
    }
    return re;
}

}