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**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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#include "clangtoolrunner.h"

#include "clangtoolsconstants.h"

#include <utils/environment.h>
#include <utils/qtcassert.h>
#include <utils/qtcprocess.h>
#include <utils/synchronousprocess.h>
#include <utils/temporaryfile.h>

#include <QDebug>
#include <QDir>
#include <QFileInfo>
#include <QLoggingCategory>

static Q_LOGGING_CATEGORY(LOG, "qtc.clangtools.runner", QtWarningMsg)

namespace ClangTools {
namespace Internal {

static QString generalProcessError(const QString &name)
{
    return ClangToolRunner::tr("An error occurred with the %1 process.").arg(name);
}

static QString finishedDueToCrash(const QString &name)
{
    return ClangToolRunner::tr("%1 crashed.").arg(name);
}

QString finishedWithBadExitCode(const QString &name, int exitCode)
{
    return ClangToolRunner::tr("%1 finished with exit code: %2.").arg(name).arg(exitCode);
}

ClangToolRunner::ClangToolRunner(const QString &clangExecutable,
                                 const QString &clangLogFileDir,
                                 const Utils::Environment &environment,
                                 const QString &name,
                                 QObject *parent)
    : QObject(parent)
    , m_clangExecutable(QDir::toNativeSeparators(clangExecutable))
    , m_clangLogFileDir(clangLogFileDir)
    , m_name(name)
{
    QTC_CHECK(!m_clangExecutable.isEmpty());
    QTC_CHECK(!m_clangLogFileDir.isEmpty());

    m_process.setProcessChannelMode(QProcess::MergedChannels);
    m_process.setProcessEnvironment(environment.toProcessEnvironment());
    m_process.setWorkingDirectory(m_clangLogFileDir); // Current clang-cl puts log file into working dir.
    connect(&m_process, &QProcess::started, this, &ClangToolRunner::onProcessStarted);
    connect(&m_process, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished),
            this, &ClangToolRunner::onProcessFinished);
    connect(&m_process, &QProcess::errorOccurred, this, &ClangToolRunner::onProcessError);
    connect(&m_process, &QProcess::readyRead, this, &ClangToolRunner::onProcessOutput);
}

ClangToolRunner::~ClangToolRunner()
{
    Utils::SynchronousProcess::stopProcess(m_process);
}

bool ClangToolRunner::run(const QString &filePath, const QStringList &compilerOptions)
{
    QTC_ASSERT(!m_clangExecutable.isEmpty(), return false);
    QTC_CHECK(!compilerOptions.contains(QLatin1String("-o")));
    QTC_CHECK(!compilerOptions.contains(filePath));

    m_filePath = filePath;
    m_processOutput.clear();

    m_logFile = createLogFile(filePath);
    QTC_ASSERT(!m_logFile.isEmpty(), return false);
    const QStringList arguments = constructCommandLineArguments(compilerOptions);
    m_commandLine = Utils::QtcProcess::joinArgs(QStringList(m_clangExecutable) + arguments);

    qCDebug(LOG).noquote() << "Starting" << m_commandLine;
    m_process.start(m_clangExecutable, arguments);
    return true;
}

void ClangToolRunner::onProcessStarted()
{
    emit started();
}

void ClangToolRunner::onProcessFinished(int exitCode, QProcess::ExitStatus exitStatus)
{
    if (exitStatus == QProcess::NormalExit) {
        if (exitCode == 0) {
            qCDebug(LOG).noquote() << "Output:\n" << Utils::SynchronousProcess::normalizeNewlines(
                                                        QString::fromLocal8Bit(m_processOutput));
            emit finishedWithSuccess(m_filePath);
        } else {
            emit finishedWithFailure(finishedWithBadExitCode(m_name, exitCode),
                                     processCommandlineAndOutput());
        }
    } else { // == QProcess::CrashExit
        emit finishedWithFailure(finishedDueToCrash(m_name), processCommandlineAndOutput());
    }
}

void ClangToolRunner::onProcessError(QProcess::ProcessError error)
{
    if (error == QProcess::Crashed)
        return; // handled by slot of finished()

    emit finishedWithFailure(generalProcessError(m_name), processCommandlineAndOutput());
}

void ClangToolRunner::onProcessOutput()
{
    m_processOutput.append(m_process.readAll());
}

QString ClangToolRunner::createLogFile(const QString &filePath) const
{
    const QString fileName = QFileInfo(filePath).fileName();
    const QString fileTemplate = m_clangLogFileDir
            + QLatin1String("/report-") + fileName + QLatin1String("-XXXXXX");

    Utils::TemporaryFile temporaryFile("clangtools");
    temporaryFile.setAutoRemove(false);
    temporaryFile.setFileTemplate(fileTemplate);
    if (temporaryFile.open()) {
        temporaryFile.close();
        return temporaryFile.fileName();
    }
    return QString();
}

QString ClangToolRunner::processCommandlineAndOutput() const
{
    return tr("Command line: %1\n"
                       "Process Error: %2\n"
                       "Output:\n%3")
                            .arg(m_commandLine,
                                 QString::number(m_process.error()),
                                 Utils::SynchronousProcess::normalizeNewlines(
                                     QString::fromLocal8Bit(m_processOutput)));
}

} // namespace Internal
} // namespace ClangTools