/****************************************************************************
**
** Copyright (C) 2012 Denis Shienkov <denis.shienkov@gmail.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtSerialPort module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
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** accordance with the commercial license agreement provided with the
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**
** BSD License Usage
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** as follows:
**
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** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
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****************************************************************************/

#include "masterthread.h"

#include <QSerialPort>
#include <QTime>

MasterThread::MasterThread(QObject *parent) :
    QThread(parent)
{
}

//! [0]
MasterThread::~MasterThread()
{
    m_mutex.lock();
    m_quit = true;
    m_cond.wakeOne();
    m_mutex.unlock();
    wait();
}
//! [0]

//! [1] //! [2]
void MasterThread::transaction(const QString &portName, int waitTimeout, const QString &request)
{
//! [1]
    const QMutexLocker locker(&m_mutex);
    m_portName = portName;
    m_waitTimeout = waitTimeout;
    m_request = request;
//! [3]
    if (!isRunning())
        start();
    else
        m_cond.wakeOne();
}
//! [2] //! [3]

//! [4]
void MasterThread::run()
{
    bool currentPortNameChanged = false;

    m_mutex.lock();
//! [4] //! [5]
    QString currentPortName;
    if (currentPortName != m_portName) {
        currentPortName = m_portName;
        currentPortNameChanged = true;
    }

    int currentWaitTimeout = m_waitTimeout;
    QString currentRequest = m_request;
    m_mutex.unlock();
//! [5] //! [6]
    QSerialPort serial;

    if (currentPortName.isEmpty()) {
        emit error(tr("No port name specified"));
        return;
    }

    while (!m_quit) {
//![6] //! [7]
        if (currentPortNameChanged) {
            serial.close();
            serial.setPortName(currentPortName);

            if (!serial.open(QIODevice::ReadWrite)) {
                emit error(tr("Can't open %1, error code %2")
                           .arg(m_portName).arg(serial.error()));
                return;
            }
        }
//! [7] //! [8]
        // write request
        const QByteArray requestData = currentRequest.toUtf8();
        serial.write(requestData);
        if (serial.waitForBytesWritten(m_waitTimeout)) {
//! [8] //! [10]
            // read response
            if (serial.waitForReadyRead(currentWaitTimeout)) {
                QByteArray responseData = serial.readAll();
                while (serial.waitForReadyRead(10))
                    responseData += serial.readAll();

                const QString response = QString::fromUtf8(responseData);
//! [12]
                emit this->response(response);
//! [10] //! [11] //! [12]
            } else {
                emit timeout(tr("Wait read response timeout %1")
                             .arg(QTime::currentTime().toString()));
            }
//! [9] //! [11]
        } else {
            emit timeout(tr("Wait write request timeout %1")
                         .arg(QTime::currentTime().toString()));
        }
//! [9]  //! [13]
        m_mutex.lock();
        m_cond.wait(&m_mutex);
        if (currentPortName != m_portName) {
            currentPortName = m_portName;
            currentPortNameChanged = true;
        } else {
            currentPortNameChanged = false;
        }
        currentWaitTimeout = m_waitTimeout;
        currentRequest = m_request;
        m_mutex.unlock();
    }
//! [13]
}
