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#include "processutils.h"

#ifdef Q_OS_WIN
#include <qt_windows.h>
#else
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#endif

namespace Utils {

QIODevice::OpenMode ProcessStartHandler::openMode() const
{
    if (m_processMode == ProcessMode::Writer)
        return QIODevice::ReadWrite; // some writers also read data
    if (m_writeData.isEmpty())
        return QIODevice::ReadOnly; // only reading
    return QIODevice::ReadWrite; // initial write and then reading (close the write channel)
}

void ProcessStartHandler::handleProcessStart()
{
    if (m_processMode == ProcessMode::Writer)
        return;
    if (m_writeData.isEmpty())
        m_process->closeWriteChannel();
}

void ProcessStartHandler::handleProcessStarted()
{
    if (!m_writeData.isEmpty()) {
        m_process->write(m_writeData);
        m_writeData = {};
        if (m_processMode == ProcessMode::Reader)
            m_process->closeWriteChannel();
    }
}

void ProcessStartHandler::setBelowNormalPriority()
{
#ifdef Q_OS_WIN
    m_process->setCreateProcessArgumentsModifier(
        [](QProcess::CreateProcessArguments *args) {
            args->flags |= BELOW_NORMAL_PRIORITY_CLASS;
    });
#endif // Q_OS_WIN
}

void ProcessStartHandler::setNativeArguments(const QString &arguments)
{
#ifdef Q_OS_WIN
    if (!arguments.isEmpty())
        m_process->setNativeArguments(arguments);
#else
    Q_UNUSED(arguments)
#endif // Q_OS_WIN
}


void ProcessHelper::setupChildProcess_impl()
{
#if defined Q_OS_UNIX
    // nice value range is -20 to +19 where -20 is highest, 0 default and +19 is lowest
    if (m_lowPriority) {
        errno = 0;
        if (::nice(5) == -1 && errno != 0)
            perror("Failed to set nice value");
    }

    // Disable terminal by becoming a session leader.
    if (m_unixTerminalDisabled)
        setsid();
#endif
}

} // namespace Utils