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#include "consumeoutputoperation.h"
#include "packagemanagercore.h"
#include "utils.h"

#include <QFile>
#include <QDir>
#include <QProcess>
#include <QDebug>

using namespace QInstaller;

ConsumeOutputOperation::ConsumeOutputOperation()
{
    setName(QLatin1String("ConsumeOutput"));
}

void ConsumeOutputOperation::backup()
{
}

bool ConsumeOutputOperation::performOperation()
{
    // Arguments:
    // 1. key where the output will be saved
    // 2. executable path
    // 3. argument for the executable
    // 4. more arguments possible ...
    if (arguments().count() < 3) {
        setError(InvalidArguments);
        setErrorString(tr("Invalid arguments in %0: %1 arguments given, %2 expected%3.").arg(name()).arg(
            arguments().count()).arg(tr("at least 2"), QLatin1String("(<to be saved installer key name>, "
            "<executable>, [argument1], [argument2], ...)")));
        return false;
    }

    PackageManagerCore *const core = value(QLatin1String("installer")).value<PackageManagerCore*>();
    if (!core) {
        setError(UserDefinedError);
        setErrorString(tr("Needed installer object in %1 operation is empty.").arg(name()));
        return false;
    }

    const QString installerKeyName = arguments().at(0);
    if (installerKeyName.isEmpty()) {
        setError(UserDefinedError);
        setErrorString(tr("Can not save the output of %1 to an empty installer key value.").arg(
            arguments().at(1)));
        return false;
    }

    QString executablePath = arguments().at(1);
#ifdef Q_OS_WIN
    if (!QFile::exists(executablePath))
        executablePath = executablePath + QLatin1String(".exe");
#endif

    const QFileInfo executable(executablePath);
    if (!executable.exists() || !executable.isExecutable()) {
        setError(UserDefinedError);
        setErrorString(tr("File '%1' does not exist or is not an executable binary.").arg(
            QDir::toNativeSeparators(executable.absoluteFilePath())));
        return false;
    }

    QByteArray executableOutput;


    const QStringList processArguments = arguments().mid(2);
    // in some cases it is not runable, because another process is blocking it(filewatcher ...)
    int waitCount = 0;
    while (executableOutput.isEmpty() && waitCount < 3) {
        QProcess process;
        process.start(executable.absoluteFilePath(), processArguments, QIODevice::ReadOnly);
        if (process.waitForFinished(10000)) {
            if (process.exitStatus() == QProcess::CrashExit) {
                qWarning() << executable.absoluteFilePath() << processArguments
                           << "crashed with exit code" << process.exitCode()
                           << "standard output: " << process.readAllStandardOutput()
                           << "error output: " << process.readAllStandardError();
                setError(UserDefinedError);
                setErrorString(tr("Running '%1' resulted in a crash.").arg(
                    QDir::toNativeSeparators(executable.absoluteFilePath())));
                return false;
            }
            executableOutput.append(process.readAllStandardOutput());
        }
        if (executableOutput.isEmpty()) {
            ++waitCount;
            static const int waitTimeInMilliSeconds = 500;
            uiDetachedWait(waitTimeInMilliSeconds);
        }
        if (process.state() > QProcess::NotRunning ) {
            qWarning() << executable.absoluteFilePath() << "process is still running, need to kill it.";
            process.kill();
        }

    }
    if (executableOutput.isEmpty()) {
        qWarning() << QString::fromLatin1("Cannot get any query output from executable: '%1'").arg(
            executable.absoluteFilePath());
    }
    core->setValue(installerKeyName, QString::fromLatin1(executableOutput));
    return true;
}

bool ConsumeOutputOperation::undoOperation()
{
    return true;
}

bool ConsumeOutputOperation::testOperation()
{
    return true;
}

Operation *ConsumeOutputOperation::clone() const
{
    return new ConsumeOutputOperation();
}

