/* ============================================================ 

Edd - Evidence Data Display

Qt-based graphical user interface for the Evidence contron system

EddLineDisplay changes its background colour in case it display
a DIM status service

April 2010, February 2012, Oliver Grimm

============================================================ */

#include "GUI.h"

class EddDim *Handler;

//
// History chooser function (opens plot for numeric data, TextHist for all other)
//
void OpenHistory(char *Service, int FromIndex, int ToIndex) {

  QString Format;
  DimBrowser Browser;
  struct EddDim::HistItem Hist = Handler->GetHistory(Service);
  char *Name, *Fmt;

  // Check if history service available
  if (strcmp(Service, "Edd/Rate_kBSec") == 0) Format = "F";
  else Format = Hist.Format;
  
  // If service currently available, take its format
  Browser.getServices(Service);
  if (Browser.getNextService(Name, Fmt) != 0) Format = QString(Fmt);

  // Open new window  	
  QMainWindow *M = new QMainWindow;
  M->setCentralWidget(new QWidget(M));
  M->setStatusBar(new QStatusBar(M));
  M->setAttribute(Qt::WA_DeleteOnClose);
  M->setWindowTitle("Edd History");

  QGridLayout *Layout = new QGridLayout(M->centralWidget());
  
  // If service ends with 'C' make text display, otherwise numeric plot
  if (Format.endsWith('C', Qt::CaseInsensitive)) Layout->addWidget(new EddText(Service), 0, 0);
  else {
    EddPlot *W = new EddPlot(Service, FromIndex);
	
	// If service is array and no index given, try to find out how many indices exist and add all
	if (FromIndex == -1 && Format.size() == 1) {
	  DimCurrentInfo X(Service, (char *) NULL, 0);
	  
	  FromIndex = 0;
	  ToIndex = EvidenceServer::Tokenize(EvidenceServer::ToString(Format.toAscii().data(), X.getData(), X.getSize()), " ").size() - 1;
  	}
	
	// Add all requested indices
	for (int i=FromIndex+1; i<=ToIndex; i++) W->AddService(Service,i);
 
	Layout->addWidget(W, 0, 0, 1, 5);
  }
  
  M->resize(400,450);
  M->show();
}

//
// Set status tip (returns true if service was available)
//
bool SetStatus(QWidget *W, QString Name, int Time, QString Format, int Index) {

  QString Status;

  if (Index != -1) Name = Name + ":" + QString::number(Index);

  if (Time == -1) Status = QString("%1:  unavailable").arg(Name);
  else Status = QString("%1:  Last update %2   Format '%3'").arg(Name).arg(QDateTime::fromTime_t(Time).toString()).arg(Format); 

  W->setStatusTip(Status);
  
  return(Time != -1);
}


//////////////////////////////////////////
// Text display for arbitary DIM service//
//////////////////////////////////////////

EddLineDisplay::EddLineDisplay(QString Name, int Index, QWidget *P):
	QLineEdit(P), ServiceName(Name), Index(Index) {

  LastHist = NULL;
 
  // Widget properties
  setReadOnly(true);
  setMaximumWidth(100);
  ShowAsTime = false;
  setFrame(false);
  setAttribute(Qt::WA_DeleteOnClose);
  QPalette Pal = palette();  
  Pal.setColor(QPalette::Base, Qt::lightGray);
  setPalette(Pal);
  
  // Context menu
  Menu = new QMenu(this);
  Menu->addAction("Open new history", this, SLOT(MenuOpenHistory()));
  Menu->addAction("Copy service", this, SLOT(MenuCopyService()));
  Menu->addAction("Copy data", this, SLOT(MenuCopyData()));

  // Subscribe to service
  Handler->Subscribe(Name, this, Index);
}

// Destructor
EddLineDisplay::~EddLineDisplay() {

  Handler->Unsubscribe(ServiceName, this, Index);
}

// Update widget
void EddLineDisplay::Update(const QString &, int Time, const QByteArray &, const QString &Format, const QString &Text, int) {

  // Check if service available
  QPalette Pal = palette();  
  if (!SetStatus(this, ServiceName, Time, Format, Index)) {
    setText("n/a");
    Pal.setColor(QPalette::Base, Qt::lightGray);
	setPalette(Pal);
	return;
  }
  else Pal.setColor(QPalette::Base, Qt::white);

  // Message service backgound colour determined by severity 
  if (ServiceName.endsWith("/Message")) {
    switch (Text.section(' ', 0, 0).toInt()) {
      case 0:  Pal.setColor(QPalette::Base, Qt::white); break;
      case 1:  Pal.setColor(QPalette::Base, Qt::yellow); break;
      case 2:  Pal.setColor(QPalette::Base, Qt::red); break;
      case 3:  Pal.setColor(QPalette::Base, Qt::red); break;
      default: break;
    }
	setText(Text.section(' ', 1));
  }
  else if (!ShowAsTime) {
    bool OK;
	double Num = Text.toDouble(&OK);
	
	if (OK) setText(QString::number(Num, 'g', 4));
 	else setText(Text);
  }
  else setText(QDateTime::fromTime_t(Text.toInt()).toString());

  setCursorPosition(0);  
  setPalette(Pal);
}

// Open plot if mouse release within widget
void EddLineDisplay::mouseReleaseEvent(QMouseEvent *Event) {

  if (Event->button()!=Qt::LeftButton || !contentsRect().contains(Event->pos())) return;

  // Check if last history plot still open, then raise
  foreach (QWidget *Widget, QApplication::allWidgets()) {
    if (Widget == LastHist) {
      Widget->activateWindow();
      Widget->raise();
      return;
    }
  }

  // If not, open new plot
  MenuOpenHistory();
}

// Handling of mouse press event: Register start position for drag
void EddLineDisplay::mousePressEvent(QMouseEvent *Event) {

  if (Event->button() == Qt::LeftButton) dragStart = Event->pos();
}

// Handling of dragging (Drag and MimeData will be deleted by Qt)
void EddLineDisplay::mouseMoveEvent(QMouseEvent *Event) {

  if ((Event->buttons() & Qt::LeftButton) == 0) return;
  if ((Event->pos()-dragStart).manhattanLength() < QApplication::startDragDistance()) return;

  QDrag *Drag = new QDrag(this);
  QMimeData *MimeData = new QMimeData;
  QByteArray Data;
  MimeData->setData("Edd/Service", Data.append(ServiceName + " " + QString::number(Index)));
  Drag->setMimeData(MimeData);
  Drag->exec();
}

//
// Opening context menu
//
void EddLineDisplay::contextMenuEvent(QContextMenuEvent *Event) {
 
  Menu->exec(Event->globalPos());
}

// Menu: Open history plot
void EddLineDisplay::MenuOpenHistory() {
  
  OpenHistory(ServiceName.toAscii().data(), Index);
}

// Menu: Copy service name
void EddLineDisplay::MenuCopyService() {
  
  QMimeData *MimeData = new QMimeData;
  QByteArray Data;
  MimeData->setData("Edd/Service", Data.append(ServiceName + " " + QString::number(Index)));
  QApplication::clipboard()->setMimeData(MimeData);
}

// Menu: Copy data
void EddLineDisplay::MenuCopyData() {

  QApplication::clipboard()->setText(text());
}


//////////////////////////////////////////
// Sending string command to DIM server //
//////////////////////////////////////////

EddCommand::EddCommand(QString Name, QWidget *P): QLineEdit(P), Name(Name) {

  setToolTip("Send command "+Name);  
  setStatusTip(QString("Command %1").arg(Name));

  connect(this, SIGNAL(returnPressed()), SLOT(SendCommand()));
}

// Get command format and returns NULL (not empty) QString if not available
QString EddCommand::GetFormat() {

  char *ItsName, *Format;
  DimBrowser Browser;

  Browser.getServices(Name.toAscii().data());
  
  if (Browser.getNextService(ItsName, Format) != DimCOMMAND) return QString();	  
  else return Format;
}

// Send command
void EddCommand::SendCommand() {

  QByteArray Data;

  // Ignore empty commands  
  if (text().isEmpty()) return;

  // Check if command available and retrieve format
  QString Format = GetFormat();

  if (Format.isNull()) {
	QMessageBox::warning(this, "Edd Message", "Command " + Name + " currently unavailable", QMessageBox::Ok);
	return;	  
  }

  // Command has no argument
  if (Format.isEmpty()) {
	DimClient::sendCommand(Name.toAscii().data(), NULL, 0);
	return;
  }
  
  // Command has string as argument
  if (Format == "C") {
	DimClient::sendCommand(Name.toAscii().data(), text().toAscii().data());
	return;
  }

  // Command has structure format, interpret data as hex
  if (Format.size() > 1) {
	Data = QByteArray::fromHex(text().toAscii());
  }
  else {
	QDataStream Stream(&Data, QIODevice::WriteOnly);
	std::vector<std::string> Values = EvidenceServer::Tokenize(text().toStdString());

	for (unsigned int i=0; i<Values.size(); i++) {
	  switch (Format[0].toAscii()) {
      case 'I':
      case 'L': Stream << (int) atoi(Values[i].c_str());			break;
      case 'S': Stream << (short) atoi(Values[i].c_str());			break;
      case 'F': Stream << (float) atof(Values[i].c_str());			break;
      case 'D': Stream << (double) atof(Values[i].c_str());			break;
      case 'X': Stream << (long long) (atof(Values[i].c_str()));	break;
	  }	
	}
  }
  
  DimClient::sendCommand(Name.toAscii().data(), Data.data(), Data.size());
  clear();
}

// Opening context menu
void EddCommand::contextMenuEvent(QContextMenuEvent *Event) {

  QMenu *Menu = createStandardContextMenu();
  Menu->addSeparator();
  Menu->addAction("Command help", this, SLOT(MenuCommandHelp()));
  Menu->exec(Event->globalPos());
  delete Menu;
}

// Help text
void EddCommand::MenuCommandHelp() {

  QString Format = GetFormat();
  QString Text = Name;
  
  if (Format.isNull()) {
	Text += " is currently unavailable";
  }
  else 	Text += " has format '"+Format+"'";

  Text +=	"\n\nCommand arguments will be transmitted as string for format 'C',\n"
  			"interpreted as an array of numbers for all other single character formats\n"
			"and as bytes in hexadecimal encoding for all more complex formats";

  QMessageBox::about(this, "Edd - Command help", Text);
}

//////////////////////////////////
// History plot for DIM service //
//////////////////////////////////

EddPlot::EddPlot(QString Service, int Index, QWidget *P): EddBasePlot(P) {

  // Widget properties
  setAcceptDrops(true);

  // Horizontal time scale
  setAxisScaleDraw(QwtPlot::xBottom, new EddDateScale());
  connect(axisWidget(QwtPlot::xBottom), SIGNAL(scaleDivChanged()), SLOT(ScaleUpdate()));

  // Additonal context menu items
  QAction* Action = Menu->addAction("Paste service", this, SLOT(MenuPasteService()));
  Menu->removeAction(Action);
  Menu->insertAction(Menu->actions().value(1), Action);

  Action = Menu->addAction("Show last hour", this, SLOT(MenuShowLastHour())); 
  Menu->insertAction(Menu->actions().value(8), Action);
  Action = Menu->addAction("Show last day", this, SLOT(MenuShowLastDay())); 
  Menu->insertAction(Menu->actions().value(8), Action);  

  Action = Menu->addAction("All as text", this, SLOT(MenuAllAsText())); 
  Menu->insertAction(Menu->actions().value(10), Action); 
   
  // Set timer update plot after new data added
  SingleShot = new QTimer(this);
  connect(SingleShot, SIGNAL(timeout()), this, SLOT(UpdatePlot()));
  SingleShot->setSingleShot(true);

  // DIM client
  if (!Service.isEmpty()) AddService(Service, Index);
}

// Destructor (items with parent widget are automatically deleted)
EddPlot::~EddPlot() {

  while (!List.isEmpty()) RemoveService(List.last().Curve);
}

// Add service to plot
void EddPlot::AddService(QString Name, int Index) {

  if (Index < 0) Index = 0;
  
  // Check if curve already present on plot
  for (int i=0; i<List.size(); i++) {
    if (Name == List[i].Name && Index == List[i].Index) {
      QMessageBox::warning(this, "Edd Message",Name+" ("+QString::number(Index)+") already present",QMessageBox::Ok);
      return;
    }
  }  

  // Generate new curve and subscribe to service
  struct ItemDetails N;

  N.Name = Name;
  N.Index = Index;
  N.Curve = NewCurve(Name+":"+QString::number(Index));
  List.append(N);

  // Get history
  struct EddDim::HistItem Hist = Handler->GetHistory(Name);

  for (int i=0; i<Hist.DataText.size(); i++) {
    if (Hist.DataText[i].second.size() > N.Index) {
	  AddPoint(List.size()-1, double(Hist.DataText[i].first)*1000, Hist.DataText[i].second.at(N.Index).toFloat());
	}
  }
 
  // Subscribe to service and start updating plot after 100 ms (to allow addition of other curves)
  Handler->Subscribe(Name, this, Index);
  SingleShot->start(100);
}

// Remove subscription
void EddPlot::RemoveService(QwtPlotCurve *Curve) {

  for (int i=0; i<List.size(); i++) if (List[i].Curve == Curve) {
	Handler->Unsubscribe(List[i].Name, this, List[i].Index);
	List.removeAt(i);
	DeleteCurve(Curve);
	break;
  }  
}

// Update widget (must happen in GUI thread)
void EddPlot::Update(const QString &Name, int Time, const QByteArray &, const QString &Format, const QString &Text, int Index) {

  for (int ItemNo=0; ItemNo<List.size(); ItemNo++) if (List[ItemNo].Name==Name && List[ItemNo].Index==Index) {

 	// Append data if service available
	if (SetStatus(this, Name, Time, Format)) AddPoint(ItemNo, (double) Time*1000, atof(Text.toAscii().data()));
	NewData = true;
  }
}

// Add text indicating time range to plot
void EddPlot::ScaleUpdate() {

  QwtText Text;
  QFont Font;
  
  // Set footer
  Text = QDateTime::fromMSecsSinceEpoch(axisScaleDiv(QwtPlot::xBottom).lowerBound()).toString("d-MMM-yyyy hh:mm:ss") + " to " + QDateTime::fromMSecsSinceEpoch(axisScaleDiv(QwtPlot::xBottom).upperBound()).toString("d-MMM-yyyy hh:mm:ss");

  Font.setPointSize(6);
  Text.setFont(Font);
  setFooter(Text);
}

// Drag and drop methods
void EddPlot::dragEnterEvent(QDragEnterEvent *Event) {
    
  if (Event->mimeData()->hasFormat("Edd/Service")) Event->acceptProposedAction();
}

void EddPlot::dropEvent(QDropEvent *Event) {

  QByteArray D(Event->mimeData()->data("Edd/Service"));
  AddService(D.left(D.lastIndexOf(' ')), D.right(D.size()-D.lastIndexOf(' ')).toInt());
}

// Add new service by pasting name
void EddPlot::MenuPasteService() {

  const QMimeData *D = QApplication::clipboard()->mimeData();
  if (!D->hasFormat("Edd/Service")) return;
  
  QByteArray E(D->data("Edd/Service"));
  AddService(E.left(E.lastIndexOf(' ')), E.right(E.size()-E.lastIndexOf(' ')).toInt());
}

// Show last hour/last day
void EddPlot::MenuShowLastHour() {

  setAxisScale(QwtPlot::xBottom, (time(NULL)-60*60)*1000, (time(NULL)+60)*1000);
  replot();
}

void EddPlot::MenuShowLastDay() {

  setAxisScale(QwtPlot::xBottom, (time(NULL)-24*3600)*1000, (time(NULL)+3600)*1000);
  replot();
}

void EddPlot::MenuAllAsText() {

  QMainWindow *M = new QMainWindow;
  M->setCentralWidget(new QWidget(M));
  M->setStatusBar(new QStatusBar(M));
  M->setAttribute(Qt::WA_DeleteOnClose);
  M->setWindowTitle("Edd Services");

  QGridLayout *Layout = new QGridLayout(M->centralWidget());

  for (int i=0; i<List.size(); i++) {
      Layout->addWidget(new EddLineDisplay(List[i].Name, List[i].Index), i/10, i%10);
  }

  M->resize(400,450);
  M->show();
}

//
// Reimplementation of QwtDateScaleDraw::label()
//
QwtText EddDateScale::label(double Value) const {

  QString Format;
   
  if (scaleDiv().range() > 30*24*60*60*1000.0) Format = "d-MMM\n yyyy";
  else if (scaleDiv().range() > 1*24*60*60*1000.0) Format = "  h 'h'\nd-MMM";
  else if (scaleDiv().range() > 60*60*1000.0) Format = "hh:mm";
  else Format = "hh:mm:ss";  

  return QwtDate::toString(toDateTime(Value), Format, QwtDate::FirstThursday);
}

//////////////////
// General plot //
//////////////////

// Constructor (all slots called in GUI thread, therefore no mutex necessary)
EddBasePlot::EddBasePlot(QWidget *P): QwtPlot(P) {

  // Widget properties
  setAttribute(Qt::WA_DeleteOnClose);
  setAutoReplot(false);
  setCanvasBackground(EddPlotBackgroundColor);
  NewData = false;

  // Plot navigation
  Zoomer = new QwtPlotZoomer(QwtPlot::xBottom,QwtPlot::yLeft,canvas());
  Zoomer->setTrackerMode(QwtPicker::AlwaysOff);
  connect(Zoomer, SIGNAL(zoomed(const QRectF &)), this, SLOT(HandleZoom(const QRectF &)));
  connect(Zoomer, SIGNAL(zoomed(const QRectF &)), this, SLOT(ReDoStats()));

  Magnifier = new QwtPlotMagnifier(canvas());
  Magnifier->setMouseButton(Qt::NoButton, Qt::NoModifier);
  Magnifier->setZoomInKey(Qt::Key_M, Qt::NoModifier);
  Magnifier->setZoomOutKey(Qt::Key_M, Qt::ShiftModifier);

  Panner = new QwtPlotPanner(canvas());
  Panner->setMouseButton(Qt::LeftButton, Qt::ShiftModifier);
  connect(Panner, SIGNAL(panned(int, int)), this, SLOT(ReDoStats()));

  Picker = new QwtPicker(QwtPicker::RectRubberBand, QwtPicker::AlwaysOff, this);
  Picker->setStateMachine(new QwtPickerDragRectMachine);
  connect(Picker, SIGNAL(selected(const QPolygon &)), SLOT(MouseSelection(const QPolygon &)));

  // Grid and legend
  Grid = new QwtPlotGrid;
  Grid->setMajorPen(QPen(Qt::gray, 0, Qt::DotLine));
  Grid->attach(this);
  
  Legend = new EddLegend();
  insertLegend(Legend, QwtPlot::TopLegend, 0.3);

  // Marker for statistics text
  Stats = new QwtPlotMarker();
  Stats->setLineStyle(QwtPlotMarker::NoLine);
  Stats->setLabelAlignment(Qt::AlignLeft | Qt::AlignBottom);
  Stats->hide();
  Stats->attach(this);

  // Context menu
  Menu = new QMenu(this);
  StripAction = Menu->addAction("Stripchart", this, SLOT(UpdatePlot()));
  StripAction->setCheckable(true);
  Menu->addSeparator();
  YLogAction = Menu->addAction("y scale log", this, SLOT(UpdatePlot()));
  YLogAction->setCheckable(true);
  NormAction = Menu->addAction("Normalize", this, SLOT(UpdatePlot()));
  NormAction->setCheckable(true);
  StyleAction = Menu->addAction("Draw dots", this, SLOT(UpdatePlot()));
  StyleAction->setCheckable(true);
  StatisticsAction = Menu->addAction("Statistics", this, SLOT(ReDoStats()));
  StatisticsAction->setCheckable(true);
  Menu->addAction("Zoom out", this, SLOT(MenuZoomOut()));
  Menu->addSeparator();
  Menu->addAction("Set update rate", this, SLOT(MenuSetUpdateRate()));  
  Menu->addSeparator();
  Menu->addAction("Save as ASCII", this, SLOT(MenuSaveASCII()));
  Menu->addAction("Save plot", this, SLOT(MenuSave()));
  Menu->addAction("Print plot", this, SLOT(MenuPrint()));
  Menu->addAction("Plot help", this, SLOT(MenuPlotHelp()));
  
  // Set timer to regularly update plot if new data available
  Timer = new QTimer(this);
  connect(Timer, SIGNAL(timeout()), this, SLOT(UpdatePlot()));
  Timer->start(2000);
}

// Destructor (items with parent widget are automatically deleted)
EddBasePlot::~EddBasePlot() {

  delete Grid;
}

// Print statistics to plot if requested
void EddBasePlot::ReDoStats() {

  QString Text;
  double Mean, Sigma;
  unsigned long Count = 0;

  // Set visibility of statistics box
  Stats->setVisible(StatisticsAction->isChecked());

  for (int i=0; i<Items.size(); i++) {
	Mean = 0;
	Sigma = 0;
	Count = 0;

    // Calculate mean and sigma for data points currently visible	
	for (int j=0; j<Items[i].y.size(); j++) {
	  if (!axisScaleDiv(QwtPlot::xBottom).contains(Items[i].x[j])) continue;
	  Mean += Items[i].y[j];
	  Sigma += Items[i].y[j]*Items[i].y[j];
	  Count++;
	}
	
	if (Count == 0) Mean = 0;
	else Mean /= Count;
	if (Count < 2) Sigma = 0;
	else Sigma = sqrt(Count/(Count-1)*(Sigma/Count-Mean*Mean));
  
	// Prepare string
	Text += Items[i].Signal->title().text() + ": m " + QString::number(Mean, 'f', 2) + ", s " + QString::number(Sigma, 'f', 2) + "\n";
  }

  // Replot once to get axis correct
  replot();

  // Print string to plot
  QwtText text(Text);
  text.setFont(QFont("Helvetica", 8));
  Stats->setValue(axisScaleDiv(QwtPlot::xBottom).upperBound(), axisScaleDiv(QwtPlot::yLeft).upperBound());
  Stats->setLabel(text);

  // Replot again to update text
  replot();
}

// Update all curves in plot
void EddBasePlot::UpdatePlot() {

  double Lower = axisScaleDiv(QwtPlot::xBottom).lowerBound();
  double Upper = axisScaleDiv(QwtPlot::xBottom).upperBound();
  double MaxTime = DBL_MIN;

  // Only update if called by timer if new data is available
  if (sender() == Timer && !NewData) return;
  NewData = false;

  // Select engine for linear or logarithmic scale
  if (!YLogAction->isChecked()) {
    setAxisScaleEngine(QwtPlot::yLeft, new QwtLinearScaleEngine);
  }
  else setAxisScaleEngine(QwtPlot::yLeft, new QwtLogScaleEngine);

  for (int ItemNo=0; ItemNo<Items.size(); ItemNo++) {
	// Determine current maximum value for strip chart plotting
	if (Items[ItemNo].Signal->boundingRect().right() > MaxTime) {
	  MaxTime = Items[ItemNo].Signal->boundingRect().right();
	}

	// Set symbol if requested
    if (StyleAction->isChecked()) {
	  QwtSymbol *Symbol = new QwtSymbol();
	  Symbol->setStyle(QwtSymbol::Ellipse);
	  Symbol->setSize(4);
	  Items[ItemNo].Signal->setSymbol(Symbol);
	}
    else Items[ItemNo].Signal->setSymbol(new QwtSymbol);

	// Determine number of data points
    int DataPoints = Items[ItemNo].x.size();	
	if (DataPoints == 0) continue;

    // Normalize y scale if requested
    double *y = new double [DataPoints];
    for (int i=0; i<DataPoints; i++) {
      y[i] = Items[ItemNo].y[i];

      if (NormAction->isChecked()) {
	    if (Items[ItemNo].Smallest != Items[ItemNo].Largest) {
		  y[i] = (y[i] - Items[ItemNo].Smallest)/(Items[ItemNo].Largest-Items[ItemNo].Smallest);
		}
	    else y[i] = 1;
      }  
    }

    // Plot data
    Items[ItemNo].Signal->setSamples(Items[ItemNo].x.data(), y, DataPoints);
    Items[ItemNo].Signal->show();
	delete[] y;

	// Generate bounding box of all curves for zoomer
	BBox = BBox.unite(Items[ItemNo].Signal->boundingRect());
  }

  // Reset zoom base to include all data
  Zoomer->setZoomBase(BBox);

  // If plot is strip char, only move axis but keep range
  if (StripAction->isChecked()) {
    setCanvasBackground(EddPlotBackgroundColor.lighter(90));
    setAxisScale(QwtPlot::xBottom, Lower+ BBox.right() - MaxTime, Upper + BBox.right() - MaxTime);
  }
  else setCanvasBackground(EddPlotBackgroundColor);

  ReDoStats();
}

// Append curve to plot
QwtPlotCurve *EddBasePlot::NewCurve(QwtText Title) {

  static Qt::GlobalColor LineColors[] = {Qt::black, Qt::blue, Qt::red, Qt::green, Qt::white,
   	Qt::darkRed, Qt::darkGreen, Qt::darkBlue, Qt::cyan, Qt::darkCyan, Qt::magenta, Qt::darkMagenta,
	Qt::gray, Qt::darkGray, Qt::lightGray};
  struct PlotItem N;

  N.Signal = new QwtPlotCurve(Title);
  N.Signal->attach(this);
  N.Signal->setPen(QColor(LineColors[Items.size() % (sizeof(LineColors)/sizeof(Qt::GlobalColor))]));
  N.Largest = DBL_MIN;
  N.Smallest = DBL_MAX;  
  Items.append(N);
  
  QVariant ItemInfo	= itemToInfo(N.Signal);
  ((EddLegendLabel *) Legend->legendWidget(ItemInfo))->Curve = N.Signal;
 
  // Context menu might delete curve and legend -> seg fault if using direct connection, as legend item deleted
  connect(((EddLegendLabel *) Legend->legendWidget(ItemInfo)), SIGNAL(DeleteCurve(QwtPlotCurve *)), SLOT(RemoveService(QwtPlotCurve *)), Qt::QueuedConnection);

  return N.Signal;
}

// Remove item
void EddBasePlot::DeleteCurve(QwtPlotCurve *Curve) {

  for (int i=0; i<Items.size(); i++) if (Items[i].Signal == Curve) {
	delete Curve;
	Items.takeAt(i);
	break;
  }
  UpdatePlot();
}

// Clear curve data
void EddBasePlot::ClearCurve(unsigned int Item) {

  if (Item >= (unsigned int) Items.size()) return;
  
  Items[Item].x.clear();
  Items[Item].y.clear();
}

// Append data point
void EddBasePlot::AddPoint(unsigned int Item, double x, double y) {

  if (Item >= (unsigned int) Items.size()) return;
  
  Items[Item].x.append(x);
  Items[Item].y.append(y);

  if (y > Items[Item].Largest) Items[Item].Largest = y;
  if (y < Items[Item].Smallest) Items[Item].Smallest = y;    
}

// Rescale plot in case selection has been made outside the canvas
void EddBasePlot::MouseSelection(const QPolygon &P_integer) {
 
  QwtInterval xPlot, xMouse, yPlot, yMouse; 
  QPolygonF P(P_integer);
  
  // Shift selected rectangle so that upper left corner is 0/0 on canvas
  QRectF R = P.boundingRect().translated(-plotLayout()->canvasRect().topLeft());

  // Current axis intervals
  xPlot = axisScaleDiv(QwtPlot::xBottom).interval();
  yPlot = axisScaleDiv(QwtPlot::yLeft).interval();
  
  // Selected axis intervals
  xMouse = QwtInterval(invTransform(QwtPlot::xBottom, R.left()),
  		invTransform(QwtPlot::xBottom, R.right()));
  yMouse = QwtInterval(invTransform(QwtPlot::yLeft, R.bottom()),
		invTransform(QwtPlot::yLeft, R.top()));

  // Selection region outside all axis?
  if (R.right() < 0 && R.top() > plotLayout()->canvasRect().height()) return;

  // If selected rectangle completely inside canvas taken care of by zoomer
  if (plotLayout()->canvasRect().contains(P.boundingRect())) return;
  
  // Rescale both axis if selected rectangle encompasses canvas completely
  if (P.boundingRect().contains(plotLayout()->canvasRect())) {
	yMouse.setMaxValue(yMouse.maxValue() + yPlot.width());
	yMouse.setMinValue(yMouse.minValue() - yPlot.width());
	xMouse.setMinValue(xMouse.minValue() - xPlot.width());
	xMouse.setMaxValue(xMouse.maxValue() + xPlot.width());

	setAxisScale(QwtPlot::xBottom, xMouse.minValue(), xMouse.maxValue());
	setAxisScale(QwtPlot::yLeft, yMouse.minValue(), yMouse.maxValue());
  }

  // Rescale y axis (increase range if selected rectangle larger than axis area)
  if (R.right() < 0) {
	if (yMouse.maxValue() > axisScaleDiv(QwtPlot::yLeft).upperBound()) {
	  yMouse.setMaxValue(yMouse.maxValue() + yPlot.width());
	}
	if (yMouse.minValue() < axisScaleDiv(QwtPlot::yLeft).lowerBound()) {
	  yMouse.setMinValue(yMouse.minValue() - yPlot.width());
	}
	
	setAxisScale(QwtPlot::yLeft, yMouse.minValue(), yMouse.maxValue());
  }

  // Rescale x axis (increase range if selected rectangle larger than axis area)
  if (R.top() > plotLayout()->canvasRect().height()) {
	if (xMouse.maxValue() > axisScaleDiv(QwtPlot::xBottom).upperBound()) {
	  xMouse.setMaxValue(xMouse.maxValue() + xPlot.width());
	}
	if (xMouse.minValue() < axisScaleDiv(QwtPlot::xBottom).lowerBound()) {
	  xMouse.setMinValue(xMouse.minValue() - xPlot.width());
	}

	setAxisScale(QwtPlot::xBottom, xMouse.minValue(), xMouse.maxValue());
  }

  // Draw new scales
  replot();
} 

// Reset graph axes to autoscale when fully unzoomed
void EddBasePlot::HandleZoom(const QRectF &) {

  if(Zoomer->zoomRectIndex() == 0) {
    setAxisAutoScale(QwtPlot::xBottom);
    setAxisAutoScale(QwtPlot::yLeft);
  }
  
  UpdatePlot();
}

// Double clicking hightlights curve
void EddBasePlot::mouseDoubleClickEvent (QMouseEvent *Event) {
	
  double Dist, MinDistance = std::numeric_limits<double>::infinity();
  int Index = -1;

  // Check which curve is closest
  for (int i=0; i<Items.size(); i++) {
	if (Items[i].Signal->closestPoint(Event->pos(), &Dist) != -1 && Dist < MinDistance) {
	  MinDistance = Dist;
	  Index = i;
	}
  }

  // Toggle 'thick line' action
  if (Index != -1) {
	((EddLegendLabel *) Legend->legendWidget(itemToInfo(Items[Index].Signal)))->ThickLineAction->toggle();
  }
} 
    
// Opening context menu
void EddBasePlot::contextMenuEvent(QContextMenuEvent *Event) {

  Menu->exec(Event->globalPos());
}

// Zoom completely out
void EddBasePlot::MenuZoomOut() {

  Zoomer->zoom(0);
  UpdatePlot();
}

// Set maximum update rate of plot
void EddBasePlot::MenuSetUpdateRate() {

  bool OK;
  double Rate;
  
  Rate = QInputDialog::getDouble(this, "Edd Request",
    "Minimum period between plot updates (sec)", (double) Timer->interval()/1000, 0, std::numeric_limits<double>::max(), 2, &OK);
  if (OK) Timer->setInterval(Rate*1000);
}

// Save data of plot as test 
void EddBasePlot::MenuSaveASCII() {
  QString Filename = QFileDialog::getSaveFileName(this,
     "Filename", ".", "Text files (*.txt *.ascii *.asc);;All files (*)");
  if (Filename.length() <= 0) return;
  
  QFile File(Filename);
  if (!File.open(QFile::WriteOnly | QIODevice::Text | QFile::Truncate)) {
    QMessageBox::warning(this, "Edd Message","Could not open file for writing.",QMessageBox::Ok);
    return;
  }

   // Write x and y data for all signals to file
  QTextStream Stream(&File);

  for (int ItemNo=0; ItemNo<Items.size(); ItemNo++) {
    Stream << QString("# ") + Items[ItemNo].Signal->title().text() + ".hist" << endl;
    for (unsigned int i=0; i<Items[ItemNo].Signal->dataSize(); i++) {
      //Stream << Items[ItemNo].x.at(i) << " " << Items[ItemNo].Signal->y(i) << endl;
      Stream << Items[ItemNo].x.at(i) << " " << Items[ItemNo].Signal->sample(i).y() << endl;
    }
  }
}

// Print plot
void EddBasePlot::MenuPrint() {

  QPrinter *Printer = new QPrinter;
  QPrintDialog *PrintDialog = new QPrintDialog(Printer, this);
  if (PrintDialog->exec() == QDialog::Accepted) {
    QPainter Painter(Printer);
    QPixmap Pixmap = QPixmap::grabWidget(this);
    Painter.drawPixmap(0, 0, Pixmap);
  }
  delete Printer;	delete PrintDialog;
}

// Save plot as image
void EddBasePlot::MenuSave() {

  QString Filename = QFileDialog::getSaveFileName(this,
     "Filename of image", "/home/ogrimm/ddd", "Image files (*.bmp *.jpg *.png *.ppm *.tiff *.xbm *.xpm);;All files (*)");
  if (Filename.length()>0) {
    QPixmap Pixmap = QPixmap::grabWidget(this);
    if(!Pixmap.save(Filename)) {
      QMessageBox::warning(this, "Edd Message","Could not write image file.",QMessageBox::Ok);
      remove(Filename.toAscii().data());
    }
  }
}

// Help text
void EddBasePlot::MenuPlotHelp() {

  QMessageBox::about(this, "Edd - Plot help",
    "Zoom\tMouse wheel\n"
	"\tKeys m and shift-m\n"
	"\tSelecting region with left mouse button\n"
	"\tMiddle button zooms out one level\n"
	"\tSelecting a range on an axis\n"
	"\tSelecting whole canvas\n\n"
    "Pan\tShift and left mouse button\n\n"
	"ESC cancels selection\n"
	"Double-clicking highlights nearest curve\n"
    "Cursor keys move mouse\n\n"
	"Statistics are calculated over the current x axis extend\n\n"
	"Items can be added to history plot by drag&drop from\n"
	"DIM service displays or from other plots legends");
}


////////////////////////////////
// Edd Legend and LegendLabel //
////////////////////////////////

// Reimplementation to return EddLegendLabel widget
QWidget *EddLegend::createWidget(const QwtLegendData &) const {

  return new EddLegendLabel();
}
	
// Constructor for EddLegendLabel class
EddLegendLabel::EddLegendLabel() {

  // Context menu
  Menu = new QMenu(this);
  Menu->addAction("Open in new history", this, SLOT(MenuOpenHistory()));
  Menu->addAction("Copy service", this, SLOT(MenuCopyService()));

  ThickLineAction = new QAction("Thick line", this);
  ThickLineAction->setCheckable(true);
  connect(ThickLineAction, SIGNAL(toggled(bool)), SLOT(MenuThickLine(bool)));
  Menu->addAction(ThickLineAction);

  Menu->addAction("Remove curve", this, SLOT(MenuRemove()));

  Curve = NULL;
}

// Opening context menu
void EddLegendLabel::contextMenuEvent(QContextMenuEvent *Event) {
 
  Menu->exec(Event->globalPos());
}

// Handling of mouse press event: Register start position for drag
void EddLegendLabel::mousePressEvent(QMouseEvent *Event) {

  if (Event->button() == Qt::LeftButton) dragStart = Event->pos();
}

// Handling of dragging (Drag and MimeData will be deleted by Qt)
void EddLegendLabel::mouseMoveEvent(QMouseEvent *Event) {

  if ((Event->buttons() & Qt::LeftButton) == 0) return;
  if ((Event->pos()-dragStart).manhattanLength() < QApplication::startDragDistance()) return;

  QString D(text().text());
  D.replace(':',' ');

  QDrag *Drag = new QDrag(this);
  QMimeData *MimeData = new QMimeData;
  QByteArray Data;
  MimeData->setData("Edd/Service", Data.append(D));
  Drag->setMimeData(MimeData);
  Drag->exec();
}

// Handling of mouse release event: Open history
void EddLegendLabel::mouseReleaseEvent(QMouseEvent *Event) {

  if (Event->button() != Qt::LeftButton) return;
  
  QString D(text().text());
  D.replace(':',' ');
  QStringList A = D.split(" ");
  
  OpenHistory(A[0].toAscii().data(), A[1].toInt());
}

// Menu: Open history plot
void EddLegendLabel::MenuOpenHistory() {

  QString D(text().text());
  D.replace(':',' ');
  QStringList A = D.split(" ");
  
  OpenHistory(A[0].toAscii().data(), A[1].toInt());
}

// Menu: Copy service name
void EddLegendLabel::MenuCopyService() {

  QString D(text().text());
  D.replace(':',' ');
  
  QMimeData *MimeData = new QMimeData;
  QByteArray Data;
  MimeData->setData("Edd/Service", Data.append(D));
  QApplication::clipboard()->setMimeData(MimeData);
}

// Menu: Thick line width
void EddLegendLabel::MenuThickLine(bool State) {

  if (Curve == NULL) {
	printf("Warning: No QwtPlotCurve set in EddLegendLabel::MenuThickLine(), programming error\n");
	return;
  }

  // Set pxel width of curve
  QPen Pen = Curve->pen();
  Pen.setWidth(State ? 4:1);
  Curve->setPen(Pen);
  Curve->plot()->replot();
  
  // Highlight legend entry
  QFont Font = font();
  Font.setWeight(State ? QFont::Bold:QFont::Normal);
  setFont(Font);
}

// Menu: Normal line width
void EddLegendLabel::MenuRemove() {

  emit(DeleteCurve(Curve));
}

//////////////////////////////////////
// History text box for DIM service //
//////////////////////////////////////

// Constructor
EddText::EddText(QString Name, bool Pure, QWidget *P):
	QTextEdit(P), Name(Name), Pure(Pure) {
  
  // Widget properties
  setReadOnly(true);
  setAttribute(Qt::WA_DeleteOnClose);
  setAutoFillBackground(true);
  document()->setMaximumBlockCount(1000);
  Accumulate = true;
  
  // Get history for this service
  if (!Pure) {
	struct EddDim::HistItem Hist = Handler->GetHistory(Name);
	
	for (int i=0; i<Hist.DataText.size(); i++) {
	  moveCursor (QTextCursor::Start);
	  insertPlainText(QString("(")+QDateTime::fromTime_t(Hist.DataText[i].first).toString()+") " +
		  QString(Hist.DataRaw[i].second) + "\n"); 
	}	
  }

  // DIM client
  Handler->Subscribe(Name, this);
}

// Destructor
EddText::~EddText() {

  Handler->Unsubscribe(Name, this);
}


// Update widget (must happen in GUI thread)
void EddText::Update(const QString &, int Time, const QByteArray &, const QString &Format, const QString &Text, int) {

  QPalette Pal = palette();  

  // Check if service available
  if (!SetStatus(this, Name, Time, Format)) {
    Pal.setColor(QPalette::Base, Qt::lightGray);
	setPalette(Pal);
    setText("n/a");
	return;
  }

  Pal.setColor(QPalette::Base, Qt::white);
  setPalette(Pal);
  QDateTime Timex = QDateTime::fromTime_t(Time); 

  // Clear display in case text should not accumulate
  if (Accumulate == false) clear();

  if (!Pure) {
    moveCursor(QTextCursor::Start);
    insertPlainText(QString("(")+Timex.toString()+QString(") "));	  
    insertPlainText(Text + "\n");	  
  }
  else 	if (Format == "C") insertPlainText(Text);
}


/////////////////////////////
// Interface to Dim system //
/////////////////////////////
EddDim::EddDim() {

  Volume = 0;
  Period = 10;
  Mutex = new QMutex(QMutex::Recursive);

  // Timer to calculate data rates
  QTimer *Timer = new QTimer(this);
  Timer->connect(Timer, SIGNAL(timeout()), this, SLOT(UpdateStatistics()));
  Timer->start(Period*1000);

  // Connect to DIM handler
  if (connect(this, SIGNAL(INT(QString, int, QByteArray, QString)), SLOT(Update(QString, int, QByteArray, QString))) == false) {
    printf("Failed connection in EddDim()\n");
  }
}

// Destructor
EddDim::~EddDim() {

  delete Mutex;
}

// Subscribe to DIM service
void EddDim::Subscribe(QString Name, class EddWidget *Instance, int Index) {

  // Lock before accessing list
  QMutexLocker Locker(Mutex);

  // Check if already subscribed to service
  if (ServiceList.contains(Name)) {
    ServiceList[Name].Subscribers.append(QPair<class EddWidget *, int>(Instance, Index));
	
	if (Index>=0 && Index<ServiceList[Name].Items.size()) {
	  Instance->Update(Name, ServiceList[Name].TimeStamp, ServiceList[Name].ByteArray, ServiceList[Name].Format, ServiceList[Name].Items[Index]);
	}
	else Instance->Update(Name, ServiceList[Name].TimeStamp, ServiceList[Name].ByteArray, ServiceList[Name].Format, ServiceList[Name].Text);

	return;
  }

  // Create new entry in service list
  ServiceList[Name].ByteArray = QByteArray();
  ServiceList[Name].TimeStamp = -1;
  ServiceList[Name].Subscribers.append(QPair<class EddWidget *, int>(Instance, Index));
  ServiceList[Name].DIMService = new DimStampedInfo(Name.toAscii().data(), INT_MAX, NO_LINK, this);
}


// Unsubscribe from DIM service
void EddDim::Unsubscribe(QString Name, class EddWidget *Instance, int Index) {

  // Lock before accessing list
  QMutexLocker Locker(Mutex);

  if (!ServiceList.contains(Name)) return;

  QPair<class EddWidget *, int> P(Instance, Index);
  
  if (ServiceList[Name].Subscribers.contains(P)) {
	ServiceList[Name].Subscribers.removeAt(ServiceList[Name].Subscribers.indexOf(P));
  }

  // If no more needed, drop DIM subsription
  if (ServiceList[Name].Subscribers.isEmpty()) {
	delete ServiceList[Name].DIMService;
	ServiceList.remove(Name);
  }
}

// Ignore service in update
void EddDim::Ignore(QString Name, bool Ignore) {

  QMutexLocker Locker(&IgnoreMutex);
  IgnoreMap[Name] = Ignore;
}

// Get history buffer
struct EddDim::HistItem EddDim::GetHistory(QString Name) {

  // History already available?
  if (HistoryList.contains(Name)) return HistoryList[Name];

  // Create history class to retrieve history data
  const struct EvidenceHistory::Item *R;
  class EvidenceHistory *Hist  = new EvidenceHistory(Name.toStdString());
  Hist->GetHistory();
  HistoryList[Name].Time = time(NULL);
  HistoryList[Name].Format = Hist->GetFormat();

  while ((R = Hist->Next()) != NULL) {
	HistoryList[Name].DataRaw.push_back(QPair<int, QByteArray>(R->Time, QByteArray(R->Data, R->Size)));
	HistoryList[Name].DataText.push_back(QPair<int, QStringList>(R->Time, QString::fromStdString(EvidenceServer::ToString(Hist->GetFormat(), R->Data, R->Size)).split(' ')));
  }
  
  delete Hist;

  return HistoryList[Name];
}


// Update throughput statistics and clear up history memory
void EddDim::UpdateStatistics() {

  // Lock before accessing internal variables
  QMutexLocker Locker(Mutex);

  // Remove unused histories after not less than 5 seconds
  QList<QString> L = HistoryList.keys();
  for(int i=0; i<L.size(); i++) {
	if ((time(NULL)-HistoryList[L[i]].Time) > 60) HistoryList.remove(L[i]);
  }
  
  float Rate = Volume/1024.0/Period;
  Volume = 0;

  // No unlock because Mutex is recursive  
  Update("Edd/Rate_kBSec", time(NULL), QByteArray((char *) &Rate, sizeof(Rate)), "F");
}


// Store service information for usage by Subscribe(), update statistics and emit signal to widgets
void EddDim::Update(QString Name, int Time, QByteArray Data, QString Format) {

  // Lock before accessing list
  QMutexLocker Locker(Mutex);

  Volume += Data.size();

  // Store service data and update all subscribers
  if (ServiceList.contains(Name)) {
	ServiceList[Name].TimeStamp = Time;
	ServiceList[Name].ByteArray = Data;
	ServiceList[Name].Format = Format;
	ServiceList[Name].Text = QString::fromStdString(EvidenceServer::ToString(Format.toAscii().data(), Data.data(), Data.size()));
	ServiceList[Name].Items = ServiceList[Name].Text.split(" ");

	for (int i=0; i<ServiceList[Name].Subscribers.size(); i++) {
	  QPair<class EddWidget *, int> P = ServiceList[Name].Subscribers[i];

	  if (P.second >=0 && P.second < ServiceList[Name].Items.size()) {
	    P.first->Update(Name, Time, Data, Format, ServiceList[Name].Items[P.second], P.second);
	  }
	  else P.first->Update(Name, Time, Data, Format, ServiceList[Name].Text, P.second);
	}
  }  
}

// Handling of DIM service update (Data asynchronouly send to EddDim::Update())
void EddDim::infoHandler() {

  QMutexLocker Locker(&IgnoreMutex);
  bool Ignore = IgnoreMap[getInfo()->getName()]; 
  Locker.unlock();

  if (!EvidenceServer::ServiceOK(getInfo())) INT(getInfo()->getName(), -1);
  else if (!Ignore) INT(getInfo()->getName(), getInfo()->getTimestamp(), QByteArray((char *) getInfo()->getData(), getInfo()->getSize()), getInfo()->getFormat());
}


/////////////////////
// Open new window //
/////////////////////

// Constructor
EddWindow::EddWindow(QString ButtonName, QString WindowName): QPushButton(ButtonName) {
  
  M = new QMainWindow;
  M->setCentralWidget(new QWidget);
  M->setStatusBar(new QStatusBar(M));
  M->setWindowTitle(WindowName);
  L = new QGridLayout(M->centralWidget());

  connect(this, SIGNAL(pressed()), M, SLOT(show()));
  connect(this, SIGNAL(pressed()), M, SLOT(raise()));
}

// Return layout
QGridLayout *EddWindow::Layout() {

  return L;
}

// Return window
QMainWindow *EddWindow::Window() {

  return M;
}