/**
 ******************************************************************************
 *
 * @file       filenamevalidatinglineedit.cpp
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
 *             Parts by Nokia Corporation (qt-info@nokia.com) Copyright (C) 2009.
 * @brief      
 * @see        The GNU Public License (GPL) Version 3
 * @defgroup   
 * @{
 * 
 *****************************************************************************/
/* 
 * 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, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "filenamevalidatinglineedit.h"
#include "qtcassert.h"

#include <QtCore/QRegExp>
#include <QtCore/QDebug>

namespace Utils {

#define WINDOWS_DEVICES "CON|AUX|PRN|COM1|COM2|LPT1|LPT2|NUL"

// Naming a file like a device name will break on Windows, even if it is
// "com1.txt". Since we are cross-platform, we generally disallow such file
//  names.
static const QRegExp &windowsDeviceNoSubDirPattern()
{
    static const QRegExp rc(QLatin1String(WINDOWS_DEVICES),
                      Qt::CaseInsensitive);
    QTC_ASSERT(rc.isValid(), return rc);
    return rc;
}

static const QRegExp &windowsDeviceSubDirPattern()
{
    static const QRegExp rc(QLatin1String(".*[/\\\\](" WINDOWS_DEVICES ")"), Qt::CaseInsensitive);
    QTC_ASSERT(rc.isValid(), return rc);
    return rc;
}

// ----------- FileNameValidatingLineEdit
FileNameValidatingLineEdit::FileNameValidatingLineEdit(QWidget *parent) :
    BaseValidatingLineEdit(parent),
    m_allowDirectories(false),
    m_unused(0)
{
}

bool FileNameValidatingLineEdit::allowDirectories() const
{
    return m_allowDirectories;
}

void FileNameValidatingLineEdit::setAllowDirectories(bool v)
{
    m_allowDirectories = v;
}

/* Validate a file base name, check for forbidden characters/strings. */

#ifdef Q_OS_WIN
#  define SLASHES "/\\"
#else
#  define SLASHES "/"
#endif

static const char *notAllowedCharsSubDir   = "?:&*\"|#%<> ";
static const char *notAllowedCharsNoSubDir = "?:&*\"|#%<> "SLASHES;

static const char *notAllowedSubStrings[] = {".."};

bool FileNameValidatingLineEdit::validateFileName(const QString &name,
                                                  bool allowDirectories,
                                                  QString *errorMessage /* = 0*/)
{
    if (name.isEmpty()) {
        if (errorMessage)
            *errorMessage = tr("The name must not be empty");
        return false;
    }
    // Characters
    const char *notAllowedChars = allowDirectories ? notAllowedCharsSubDir : notAllowedCharsNoSubDir;
    for (const char *c = notAllowedChars; *c; c++)
        if (name.contains(QLatin1Char(*c))) {
            if (errorMessage)
                *errorMessage = tr("The name must not contain any of the characters '%1'.").arg(QLatin1String(notAllowedChars));
            return false;
        }
    // Substrings
    const int notAllowedSubStringCount = sizeof(notAllowedSubStrings)/sizeof(const char *);
    for (int s = 0; s < notAllowedSubStringCount; s++) {
        const QLatin1String notAllowedSubString(notAllowedSubStrings[s]);
        if (name.contains(notAllowedSubString)) {
            if (errorMessage)
                *errorMessage = tr("The name must not contain '%1'.").arg(QString(notAllowedSubString));
            return false;
        }
    }
    // Windows devices
    bool matchesWinDevice = windowsDeviceNoSubDirPattern().exactMatch(name);
    if (!matchesWinDevice && allowDirectories)
        matchesWinDevice = windowsDeviceSubDirPattern().exactMatch(name);
    if (matchesWinDevice) {
        if (errorMessage)
            *errorMessage = tr("The name must not match that of a MS Windows device. (%1).").
                            arg(windowsDeviceNoSubDirPattern().pattern().replace(QLatin1Char('|'), QLatin1Char(',')));
        return false;
    }
    return true;
}

bool  FileNameValidatingLineEdit::validate(const QString &value, QString *errorMessage) const
{
    return validateFileName(value, m_allowDirectories, errorMessage);
}

} // namespace Utils