/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2018-     Equinor ASA
//
//  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 "RiaTextFileCompare.h"

#include "cafUtils.h"

#include <QProcess>

// Disable deprecation warning for QProcess::start()
#ifdef _MSC_VER
#pragma warning( disable : 4996 )
#endif
#ifdef __GNUC__
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiaTextFileCompare::RiaTextFileCompare( const QString& pathToDiffTool )
    : m_pathToDiffTool( pathToDiffTool )
{
    reset();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiaTextFileCompare::~RiaTextFileCompare()
{
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaTextFileCompare::reset()
{
    m_lastError = ErrorType::IC_NO_ERROR;
    m_errorMsg.clear();
    m_errorDetails.clear();
    m_diffOutput.clear();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
bool RiaTextFileCompare::runComparison( const QString& baseFolder, const QString& generatedFolder )
{
    reset();

    QString fullFilePath = "diff";
    if ( !m_pathToDiffTool.isEmpty() )
    {
        fullFilePath = m_pathToDiffTool + "/" + fullFilePath;
    }

    // Command line arguments used when invoking 'diff'
    // See https://docs.freebsd.org/info/diff/diff.info.diff_Options.html
    QString args = "-r -u --strip-trailing-cr";

    QString completeCommand = QString( "\"%1\" %2 %3 %4" ).arg( fullFilePath ).arg( baseFolder ).arg( generatedFolder ).arg( args );

    // Launch process and wait
    QProcess proc;
    proc.start( completeCommand );
    proc.waitForFinished( 30000 );

    QProcess::ProcessError procError = proc.error();
    if ( procError != QProcess::UnknownError )
    {
        m_lastError    = ErrorType::SEVERE_ERROR;
        m_errorMsg     = "Error running 'diff' tool process";
        m_errorDetails = completeCommand;
        return false;
    }

    QByteArray stdErr       = proc.readAllStandardError();
    int        procExitCode = proc.exitCode();

    if ( procExitCode == 0 )
    {
        return true;
    }
    else if ( procExitCode == 1 )
    {
        QByteArray stdOut = proc.readAllStandardOutput();
        m_diffOutput      = stdOut;

        return false;
    }
    else
    {
        stdErr = stdErr.simplified();

        // Report non-severe error
        m_lastError    = ErrorType::IC_ERROR;
        m_errorMsg     = "Error running 'diff' tool process";
        m_errorDetails = stdErr;

        return false;
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiaTextFileCompare::ErrorType RiaTextFileCompare::error() const
{
    return m_lastError;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QString RiaTextFileCompare::errorMessage() const
{
    return m_errorMsg;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QString RiaTextFileCompare::errorDetails() const
{
    return m_errorDetails;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QString RiaTextFileCompare::diffOutput() const
{
    return m_diffOutput;
}