/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2011-     Statoil ASA
//  Copyright (C) 2013-     Ceetron Solutions AS
//  Copyright (C) 2011-2012 Ceetron AS
// 
//  ResInsight 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.
// 
//  ResInsight 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 at <http://www.gnu.org/licenses/gpl.html> 
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#include "RiaFilePathTools.h"
#include <QDir>


//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
const QChar RiaFilePathTools::SEPARATOR = '/';

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
QString RiaFilePathTools::toInternalSeparator(const QString& path)
{
    QString currNativeSep = QDir::separator();

    if (currNativeSep == "/")
    {
        // On Linux like system -> Do not convert separators
        return path;
    }

    // On other systems (i.e. Windows) -> Convert to internal separator (/)
    QString output = path;
    return output.replace(QString("\\"), SEPARATOR);
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
QString& RiaFilePathTools::appendSeparatorIfNo(QString& path)
{
    if (!path.endsWith(SEPARATOR))
    {
        path.append(SEPARATOR);
    }
    return path;
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
QString RiaFilePathTools::relativePath(const QString& rootDir, const QString& dir)
{
    if (dir.startsWith(rootDir))
    {
        QString relPath = dir;
        relPath.remove(0, rootDir.size());

        if (relPath.startsWith(SEPARATOR)) relPath.remove(0, 1);
        return appendSeparatorIfNo(relPath);
    }
    else
    {
        return dir;
    }
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
bool RiaFilePathTools::equalPaths(const QString& path1, const QString& path2)
{
    QString p1 = path1;
    QString p2 = path2;
    appendSeparatorIfNo(p1);
    appendSeparatorIfNo(p2);
    return p1 == p2;
}

//--------------------------------------------------------------------------------------------------
/// Own canonicalPath method since the QDir::canonicalPath seems to not work
//--------------------------------------------------------------------------------------------------
QString RiaFilePathTools::canonicalPath(const QString& path)
{
    return QDir(path).absolutePath();
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
QString RiaFilePathTools::commonRootPath(const QStringList& paths)
{
    if (paths.size() < 2) return "";

    int i = 0;
    int iDir = 0;
    for(i = 0; ; i++)
    {
        bool isCommon = true;
        QChar ch = i < paths.front().size() ? paths.front()[i] : 0;

        // Remember last directory separator
        if (i > 0 && (ch == '/' || ch == '\\')) iDir = i;

        // Compare characters at position i
        for (const QString& path : paths)
        {
            if (ch == 0 || path[i] != ch)
            {
                isCommon = false;
                break;
            }
        }

        if (!isCommon) break;
    }

    return paths.front().left(iDir + 1);
}