/**
 ******************************************************************************
 *
 * @file       serialplugin.cpp
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
 * @addtogroup GCSPlugins GCS Plugins
 * @{
 * @addtogroup SerialPlugin Serial Connection Plugin
 * @{
 * @brief Impliments serial connection to the flight hardware for Telemetry
 *****************************************************************************/
/*
 * This program 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.
 *
 * This program 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
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include "serialplugin.h"

#include <extensionsystem/pluginmanager.h>
#include <coreplugin/icore.h>

#include <QtCore/QtPlugin>
#include <QMainWindow>

#include <QDebug>


SerialEnumerationThread::SerialEnumerationThread(SerialConnection *serial)
    : m_serial(serial),
    m_running(true)
{}

SerialEnumerationThread::~SerialEnumerationThread()
{
    m_running = false;
    // wait for the thread to terminate
    if (wait(2100) == false) {
        qDebug() << "Cannot terminate SerialEnumerationThread";
    }
}

void SerialEnumerationThread::run()
{
    QList <Core::IConnection::device> devices = m_serial->availableDevices();

    while (m_running) {
        if (!m_serial->deviceOpened()) {
            QList <Core::IConnection::device> newDev = m_serial->availableDevices();
            if (devices != newDev) {
                devices = newDev;
                emit enumerationChanged();
            }
        }

        msleep(2000); // update available devices every two seconds (doesn't need more)
    }
}


SerialConnection::SerialConnection()
    : enablePolling(true), m_enumerateThread(this)
{
    serialHandle  = NULL;
    m_config      = new SerialPluginConfiguration("Serial Telemetry", NULL, this);
    m_config->restoresettings();

    m_optionspage = new SerialPluginOptionsPage(m_config, this);


    // Experimental: enable polling on all OS'es since there
    // were reports that autodetect does not work on XP amongst
    // others.

    // #ifdef Q_OS_WIN
////I'm cheating a little bit here:
////Knowing if the device enumeration really changed is a bit complicated
////so I just signal it whenever we have a device event...
// QMainWindow *mw = Core::ICore::instance()->mainWindow();
// QObject::connect(mw, SIGNAL(deviceChange()),
// this, SLOT(onEnumerationChanged()));
// #else
    // Other OSes do not send such signals:
    QObject::connect(&m_enumerateThread, SIGNAL(enumerationChanged()),
                     this, SLOT(onEnumerationChanged()));
    m_enumerateThread.start();
// #endif
}

SerialConnection::~SerialConnection()
{}

void SerialConnection::onEnumerationChanged()
{
    if (enablePolling) {
        emit availableDevChanged(this);
    }
}

bool sortPorts(const QSerialPortInfo &s1, const QSerialPortInfo &s2)
{
    return s1.portName() < s2.portName();
}

QList <Core::IConnection::device> SerialConnection::availableDevices()
{
    QList <Core::IConnection::device> list;

    if (enablePolling) {
        QList<QSerialPortInfo> ports = QSerialPortInfo::availablePorts();

        // sort the list by port number (nice idea from PT_Dreamer :))
        qSort(ports.begin(), ports.end(), sortPorts);
        foreach(QSerialPortInfo port, ports) {
            device d;

            d.displayName = port.portName();
            d.name = port.portName();
            list.append(d);
        }
    }

    return list;
}

QIODevice *SerialConnection::openDevice(const QString &deviceName)
{
    if (serialHandle) {
        closeDevice(deviceName);
    }
    QList<QSerialPortInfo> ports = QSerialPortInfo::availablePorts();
    foreach(QSerialPortInfo port, ports) {
        if (port.portName() == deviceName) {
            // we need to handle port settings here...
            qDebug() << "Serial telemetry running at " << m_config->speed();
            serialHandle = new QSerialPort(port, this);
            if (serialHandle->open(QIODevice::ReadWrite)) {
                if (serialHandle->setBaudRate(m_config->speed().toInt())
                    && serialHandle->setDataBits(QSerialPort::Data8)
                    && serialHandle->setParity(QSerialPort::NoParity)
                    && serialHandle->setStopBits(QSerialPort::OneStop)
                    && serialHandle->setFlowControl(QSerialPort::NoFlowControl)) {
                    m_deviceOpened = true;
                }
            }
            return serialHandle;
        }
    }
    return NULL;
}

void SerialConnection::closeDevice(const QString &deviceName)
{
    Q_UNUSED(deviceName);
    // we have to delete the serial connection we created
    if (serialHandle) {
        serialHandle->deleteLater();
        serialHandle   = NULL;
        m_deviceOpened = false;
    }
}


QString SerialConnection::connectionName()
{
    return QString("Serial port");
}

QString SerialConnection::shortName()
{
    return QString("Serial");
}

/**
   Tells the Serial plugin to stop polling for serial devices
 */
void SerialConnection::suspendPolling()
{
    enablePolling = false;
}

/**
   Tells the Serial plugin to resume polling for serial devices
 */
void SerialConnection::resumePolling()
{
    enablePolling = true;
}

SerialPlugin::SerialPlugin()
{}

SerialPlugin::~SerialPlugin()
{
    removeObject(m_connection->Optionspage());
}

void SerialPlugin::extensionsInitialized()
{
    addAutoReleasedObject(m_connection);
}

bool SerialPlugin::initialize(const QStringList &arguments, QString *errorString)
{
    Q_UNUSED(arguments);
    Q_UNUSED(errorString);
    m_connection = new SerialConnection();
    // must manage this registration of child object ourselves
    // if we use an autorelease here it causes the GCS to crash
    // as it is deleting objects as the app closes...
    addObject(m_connection->Optionspage());
    return true;
}