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/***************************************************************************
 *   Copyright (C) 2003,2012 by Martin Koller                              *
 *   kollix@aon.at                                                         *
 *   This file is part of the KDE Control Center Module for Joysticks      *
 *                                                                         *
 *   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 2 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.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
 ***************************************************************************/
#include "joywidget.h"
#include "joydevice.h"
#include "poswidget.h"
#include "caldialog.h"

#include <QTableWidget>
#include <QLabel>
#include <QCheckBox>
#include <QTimer>
#include <QFontMetrics>
#include <QPushButton>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QHeaderView>

#include <KLocalizedString>
#include <kdialog.h>
#include <kmessagebox.h>
#include <kiconloader.h>
#include <kcombobox.h>
#include <kurlcompletion.h>
#include <kmessagewidget.h>

#include <stdio.h>
#include <kvbox.h>
#include <kdebug.h>

//--------------------------------------------------------------
static QString PRESSED = I18N_NOOP("PRESSED");
//--------------------------------------------------------------

class TableWidget : public QTableWidget
{
  public:
    TableWidget(int row, int col) : QTableWidget(row, col) {}

    QSize sizeHint() const override
    {
      return QSize(150, 100);  // return a smaller size than the Qt default(256, 192)
    }
};

//--------------------------------------------------------------

JoyWidget::JoyWidget(QWidget *parent)
 : QWidget(parent), idle(nullptr), joydev(nullptr)
{
  QVBoxLayout *mainVbox = new QVBoxLayout(this);
  mainVbox->setSpacing(KDialog::spacingHint());
  mainVbox->setContentsMargins(0, 0, 0, 0);

  // create area to show an icon + message if no joystick was detected
  {
    messageBox = new KMessageWidget(this);
    messageBox->setMessageType(KMessageWidget::Error);
    messageBox->setCloseButtonVisible(false);
    messageBox->hide();

    mainVbox->addWidget(messageBox);
  }

  QHBoxLayout *devHbox = new QHBoxLayout;
  devHbox->setSpacing(KDialog::spacingHint());
  devHbox->addWidget(new QLabel(i18n("Device:")));
  devHbox->addWidget(device = new KComboBox(true));

  device->setInsertPolicy(QComboBox::NoInsert);
  KUrlCompletion *kc = new KUrlCompletion(KUrlCompletion::FileCompletion);
  device->setCompletionObject(kc);
  device->setAutoDeleteCompletionObject(true);
  connect(device, SIGNAL(activated(QString)), this, SLOT(deviceChanged(QString)));
  connect(device, SIGNAL(returnPressed(QString)), this, SLOT(deviceChanged(QString)));
  devHbox->setStretchFactor(device, 3);

  QHBoxLayout *hbox = new QHBoxLayout;
  hbox->setSpacing(KDialog::spacingHint());

  mainVbox->addLayout(devHbox);
  mainVbox->addLayout(hbox);

  QVBoxLayout *vboxLeft = new QVBoxLayout;
  vboxLeft->setSpacing(KDialog::spacingHint());
  vboxLeft->addWidget(new QLabel(i18nc("Cue for deflection of the stick", "Position:")));
  vboxLeft->addWidget(xyPos = new PosWidget);

  vboxLeft->addWidget(trace = new QCheckBox(i18n("Show trace")));
  connect(trace, &QAbstractButton::toggled, this, &JoyWidget::traceChanged);

  QVBoxLayout *vboxMid = new QVBoxLayout;
  vboxMid->setSpacing(KDialog::spacingHint());

  QVBoxLayout *vboxRight = new QVBoxLayout;
  vboxRight->setSpacing(KDialog::spacingHint());

  // calculate the column width we need
  QFontMetrics fm(font());
  int colWidth = qMax(fm.width(PRESSED), fm.width(QStringLiteral("-32767"))) + 10;  // -32767 largest string

  vboxMid->addWidget(new QLabel(i18n("Buttons:")));
  buttonTbl = new TableWidget(0, 1);
  buttonTbl->setSelectionMode(QAbstractItemView::NoSelection);
  buttonTbl->setEditTriggers(QAbstractItemView::NoEditTriggers);
  buttonTbl->setHorizontalHeaderLabels(QStringList(i18n("State")));
  buttonTbl->setSortingEnabled(false);
  buttonTbl->horizontalHeader()->setSectionsClickable(false);
  buttonTbl->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
  buttonTbl->horizontalHeader()->resizeSection(0, colWidth);
  buttonTbl->verticalHeader()->setSectionsClickable(false);
  vboxMid->addWidget(buttonTbl);

  vboxRight->addWidget(new QLabel(i18n("Axes:")));
  axesTbl = new TableWidget(0, 1);
  axesTbl->setSelectionMode(QAbstractItemView::NoSelection);
  axesTbl->setEditTriggers(QAbstractItemView::NoEditTriggers);
  axesTbl->setHorizontalHeaderLabels(QStringList(i18n("Value")));
  axesTbl->setSortingEnabled(false);
  axesTbl->horizontalHeader()->setSectionsClickable(false);
  axesTbl->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
  axesTbl->horizontalHeader()->resizeSection(0, colWidth);
  axesTbl->verticalHeader()->setSectionsClickable(false);
  vboxRight->addWidget(axesTbl);

  hbox->addLayout(vboxLeft);
  hbox->addLayout(vboxMid);
  hbox->addLayout(vboxRight);

  // calibrate button
  calibrate = new QPushButton(i18n("Calibrate"));
  connect(calibrate, &QAbstractButton::clicked, this, &JoyWidget::calibrateDevice);
  calibrate->setEnabled(false);

  vboxLeft->addStretch();
  vboxLeft->addWidget(calibrate);

  // set up a timer for idle processing of joystick events
  idle = new QTimer(this);
  connect(idle, &QTimer::timeout, this, &JoyWidget::checkDevice);

  // check which devicefiles we have
  init();
}

//--------------------------------------------------------------

JoyWidget::~JoyWidget()
{
  delete joydev;
}

//--------------------------------------------------------------

void JoyWidget::init()
{
  // check which devicefiles we have
  int i;
  bool first = true;
  char dev[30];

  device->clear();
  buttonTbl->setRowCount(0);
  axesTbl->setRowCount(0);

  for (i = 0; i < 5; i++)  // check the first 5 devices
  {
    sprintf(dev, "/dev/js%d", i);  // first look in /dev
    JoyDevice *joy = new JoyDevice(dev);

    if ( joy->open() != JoyDevice::SUCCESS )
    {
      delete joy;
      sprintf(dev, "/dev/input/js%d", i);  // then look in /dev/input
      joy = new JoyDevice(dev);

      if ( joy->open() != JoyDevice::SUCCESS )
      {
        delete joy;
        continue;    // try next number
      }
    }

    // we found one

    device->addItem(QStringLiteral("%1 (%2)").arg(joy->text()).arg(joy->device()));

    // display values for first device
    if ( first )
    {
      showDeviceProps(joy);  // this sets the joy object into this->joydev
      first = false;
    }
    else
      delete joy;
  }

  /* KDE 4: Remove this check(and i18n) when all KCM wrappers properly test modules */
  if ( device->count() == 0 )
  {
    messageBox->show();
    messageBox->setText(QStringLiteral("<qt>%1</qt>").arg(
      i18n("No joystick device automatically found on this computer.<br />"
           "Checks were done in /dev/js[0-4] and /dev/input/js[0-4]<br />"
           "If you know that there is one attached, please enter the correct device file.")));
  }
}

//--------------------------------------------------------------

void JoyWidget::traceChanged(bool state)
{
  xyPos->showTrace(state);
}

//--------------------------------------------------------------

void JoyWidget::restoreCurrDev()
{
  if ( !joydev )  // no device open
  {
    device->setEditText(QLatin1String(""));
    calibrate->setEnabled(false);
  }
  else
  {
    // try to find the current open device in the combobox list
    int index = device->findText(joydev->device(), Qt::MatchContains);

    if ( index == -1 )  // the current open device is one the user entered (not in the list)
      device->setEditText(joydev->device());
    else
      device->setEditText(device->itemText(index));
  }
}

//--------------------------------------------------------------

void JoyWidget::deviceChanged(const QString &dev)
{
  // find "/dev" in given string
  int start, stop;
  QString devName;

  if ( (start = dev.indexOf(QLatin1String("/dev"))) == -1 )
  {
    KMessageBox::sorry(this,
      i18n("The given device name is invalid (does not contain /dev).\n"
           "Please select a device from the list or\n"
           "enter a device file, like /dev/js0."), i18n("Unknown Device"));

    restoreCurrDev();
    return;
  }

  if ( (stop = dev.indexOf(QLatin1Char(')'), start)) != -1 )  // seems to be text selected from our list
    devName = dev.mid(start, stop - start);
  else
    devName = dev.mid(start);

  if ( joydev && (devName == joydev->device()) ) return;  // user selected the current device; ignore it

  JoyDevice *joy = new JoyDevice(devName);
  JoyDevice::ErrorCode ret = joy->open();

  if ( ret != JoyDevice::SUCCESS )
  {
    KMessageBox::error(this, joy->errText(ret), i18n("Device Error"));

    delete joy;
    restoreCurrDev();
    return;
  }

  showDeviceProps(joy);
}

//--------------------------------------------------------------

void JoyWidget::showDeviceProps(JoyDevice *joy)
{
  joydev = joy;

  buttonTbl->setRowCount(joydev->numButtons());

  axesTbl->setRowCount(joydev->numAxes());
  if ( joydev->numAxes() >= 2 )
  {
    axesTbl->setVerticalHeaderItem(0, new QTableWidgetItem(i18n("1(x)")));
    axesTbl->setVerticalHeaderItem(1, new QTableWidgetItem(i18n("2(y)")));
  }

  calibrate->setEnabled(true);
  idle->start(0);

  // make both tables use the same space for header; this looks nicer
  // TODO: Don't know how to do this in Qt4; the following does no longer work
  // Probably by setting a sizeHint for every single header item ?
  /*
  buttonTbl->verticalHeader()->setFixedWidth(qMax(buttonTbl->verticalHeader()->width(),
                                                    axesTbl->verticalHeader()->width()));
  axesTbl->verticalHeader()->setFixedWidth(buttonTbl->verticalHeader()->width());
  */
}

//--------------------------------------------------------------

void JoyWidget::checkDevice()
{
  if ( !joydev ) return;  // no open device yet

  JoyDevice::EventType type;
  int number, value;

  if ( !joydev->getEvent(type, number, value) )
    return;

  if ( type == JoyDevice::BUTTON )
  {
    if ( ! buttonTbl->item(number, 0) )
      buttonTbl->setItem(number, 0, new QTableWidgetItem());

    if ( value == 0 )  // button release
      buttonTbl->item(number, 0)->setText(QStringLiteral("-"));
    else
      buttonTbl->item(number, 0)->setText(PRESSED);
  }

  if ( type == JoyDevice::AXIS )
  {
    if ( number == 0 ) // x-axis
      xyPos->changeX(value);

    if ( number == 1 ) // y-axis
      xyPos->changeY(value);

    if ( ! axesTbl->item(number, 0) )
      axesTbl->setItem(number, 0, new QTableWidgetItem());

    axesTbl->item(number, 0)->setText(QStringLiteral("%1").arg(int(value)));
  }
}

//--------------------------------------------------------------

void JoyWidget::calibrateDevice()
{
  if ( !joydev ) return;  // just to be save

  JoyDevice::ErrorCode ret = joydev->initCalibration();

  if ( ret != JoyDevice::SUCCESS )
  {
    KMessageBox::error(this, joydev->errText(ret), i18n("Communication Error"));
    return;
  }

  if ( KMessageBox::messageBox(this, KMessageBox::Information,
        i18n("<qt>Calibration is about to check the precision.<br /><br />"
             "<b>Please move all axes to their center position and then "
             "do not touch the joystick anymore.</b><br /><br />"
             "Click OK to start the calibration.</qt>"),
        i18n("Calibration"),
        KStandardGuiItem::ok(), KStandardGuiItem::cancel()) != KMessageBox::Ok )
    return;

  idle->stop();  // stop the joystick event getting; this must be done inside the calibrate dialog

  CalDialog dlg(this, joydev);
  dlg.calibrate();

  // user canceled somewhere during calibration, therefore the device is in a bad state
  if ( dlg.result() == QDialog::Rejected )
    joydev->restoreCorr();

  idle->start(0);  // continue with event getting
}

//--------------------------------------------------------------

void JoyWidget::resetCalibration()
{
  if ( !joydev ) return;  // just to be save

  JoyDevice::ErrorCode ret = joydev->restoreCorr();

  if ( ret != JoyDevice::SUCCESS )
  {
    KMessageBox::error(this, joydev->errText(ret), i18n("Communication Error"));
  }
  else
  {
    KMessageBox::information(this,
      i18n("Restored all calibration values for joystick device %1.", joydev->device()),
      i18n("Calibration Success"));
  }
}

//--------------------------------------------------------------