//===========================================
//  Lumina-desktop source code
//  Copyright (c) 2017, Ken Moore
//  Available under the 3-clause BSD license
//  See the LICENSE file for full details
//===========================================
#include "RootDesktopObject.h"
#include <QQmlEngine>
#include <QApplication>
#include <QScreen>
#include <global-objects.h>
#include <QDebug>

// === PUBLIC ===
RootDesktopObject::RootDesktopObject(QObject *parent) : QObject(parent){
  last_window_up = 0;
  //updateScreens(); //make sure the internal list is updated right away
  connect(this, SIGNAL(changePanels(QStringList)), this, SLOT(setPanels(QStringList)) );
  currentTimeTimer = new QTimer(this);
  connect(currentTimeTimer, SIGNAL(timeout()), this, SLOT(updateCurrentTime()) );
  availgeomTimer = new QTimer(this);
    availgeomTimer->setInterval(100);
    availgeomTimer->setSingleShot(true);
    connect(availgeomTimer, SIGNAL(timeout()), this, SLOT(submitSessionGeom()) );
}

RootDesktopObject::~RootDesktopObject(){

}

void RootDesktopObject::RegisterType(){
  static bool done = false;
  if(done){ return; }
  done=true;
  qmlRegisterType<RootDesktopObject>("Lumina.Backend.RootDesktopObject", 2, 0, "RootDesktopObject");
  //Also register any types that are needed by this class
  ScreenObject::RegisterType();
  NativeWindowObject::RegisterType();
  OSInterface::RegisterType();
}

RootDesktopObject* RootDesktopObject::instance(){
  static RootDesktopObject* r_obj = new RootDesktopObject();
  return r_obj;
}

//QML Read Functions
QStringList RootDesktopObject::screens(){
  if(s_objects.length()<1){ updateScreens(); }
  //qDebug() << "Request Screens:" << s_objects.length();
  QStringList names;
  for(int i=0; i<s_objects.length(); i++){ names << s_objects[i]->name(); }
  return names;
}

ScreenObject* RootDesktopObject::screen(QString id){
  if(s_objects.length()<1){ updateScreens(); }
  //qDebug() << "Got Screen Request:" << id;
  for(int i=0; i<s_objects.length(); i++){
    if(s_objects[i]->name()==id){ return s_objects[i]; }
  }
  return 0;
}

QStringList RootDesktopObject::panels(){
  //qDebug() << "Request Panels:" << panel_objects.length();
  QStringList names;
  for(int i=0; i<panel_objects.length(); i++){ names << panel_objects[i]->name(); }
  return names;
}

PanelObject* RootDesktopObject::panel(QString id){
  //qDebug() << "Got Panel Request:" << id;
  for(int i=0; i<panel_objects.length(); i++){
    if(panel_objects[i]->name()==id){ return panel_objects[i]; }
  }
  return 0;
}

QStringList RootDesktopObject::windows(){
  //qDebug() << "Request Panels:" << panel_objects.length();
  QStringList names;
  for(int i=0; i<window_objects.length(); i++){ names << QString::number(window_objects[i]->id()); }
  return names;
}

NativeWindowObject* RootDesktopObject::window(QString id){
  //qDebug() << "Got Panel Request:" << id;
  WId chk = id.toInt(); //numerical ID's in this case
  for(int i=0; i<window_objects.length(); i++){
    if(window_objects[i]->id()==chk){ return window_objects[i]; }
  }
  return 0;
}

QStringList RootDesktopObject::trayWindows(){
  //qDebug() << "Request Panels:" << panel_objects.length();
  QStringList names;
  for(int i=0; i<tray_window_objects.length(); i++){ names << QString::number(tray_window_objects[i]->id()); }
  return names;
}

NativeWindowObject* RootDesktopObject::trayWindow(QString id){
  //qDebug() << "Got Panel Request:" << id;
  WId chk = id.toInt(); //numerical ID's in this case
  for(int i=0; i<tray_window_objects.length(); i++){
    if(tray_window_objects[i]->id()==chk){ return tray_window_objects[i]; }
  }
  return 0;
}

bool RootDesktopObject::hasTrayWindows(){
  return !tray_window_objects.isEmpty();
}

QString RootDesktopObject::currentTime(){
  return currentTimeString;
}

QDateTime RootDesktopObject::currentDateTime(){
  return currentDateTimeStruct;
}

OSInterface* RootDesktopObject::os_interface(){
  return OSInterface::instance();
}

void RootDesktopObject::setPanels(QList<PanelObject*> list){
  panel_objects = list;
  emit panelsChanged();
}

void RootDesktopObject::setPanels(QStringList ids){
  //Make this thread-safe for object creation
  if(this->thread() != QThread::currentThread()){
    //use internal signal/slot combo to change threads
    this->emit changePanels(ids);
    return;
  }
  //qDebug() << "GOT PANEL CHANGE:" << ids;
  //Get the current bounding rectangle for the session
  QRect total;
  bool change = false;
  for(int i=0; i<=s_objects.length(); i++){
    QRect geom;
    QString prefix;
    if(i==s_objects.length()){
      geom = total; //session geometry
      prefix="session/";
    }else{
      geom = s_objects[i]->geometry();
      total = total.united(geom);
      prefix=s_objects[i]->name()+"/";
    }
    QStringList newids = ids.filter(prefix);
    //qDebug() << " Check Panel IDs:" << prefix << newids << ids;
    //First update/remove any current panel objects
    for(int i=0; i<panel_objects.length(); i++){
      if(newids.contains(panel_objects[i]->name()) ){
        //qDebug() << " - Update Existing Panel:" << panel_objects[i]->name();
        newids.removeAll(panel_objects[i]->name()); //already handled
        panel_objects[i]->syncWithSettings(geom);
      }else if(panel_objects[i]->name().startsWith(prefix) ){
        //qDebug() << " - Remove Existing Panel:" << panel_objects[i]->name();
        panel_objects.takeAt(i)->deleteLater();
        i--;
        change = true; //list changed
      }
    }
    //Now create any new panel objects as needed
    for(int i=0; i<newids.length(); i++){
      //qDebug() << " - Create Panel:" << newids[i];
      PanelObject *tmp = new PanelObject(newids[i], this);
      tmp->syncWithSettings(geom);
      panel_objects << tmp;
      change = true; //list changed
    }
  } //end loop over screens+session
  //Now calculate the available session geometry
  QRegion sess(total);
  for(int i=0; i<panel_objects.length(); i++){
    sess = sess.subtracted( QRegion(panel_objects[i]->geometry()) );
  }
  if(sess != session_avail_geom){
    session_avail_geom = sess;
    emit sessionGeomAvailableChanged();
  }

  if(change){ emit panelsChanged(); }
}

void RootDesktopObject::setWindows(QList<NativeWindowObject*> list){
  window_objects = list;
  emit windowsChanged();
  mousePositionChanged(true);
}

void RootDesktopObject::setTrayWindows(QList<NativeWindowObject*> list){
  tray_window_objects = list;
  emit trayWindowsChanged();
  mousePositionChanged(true);
}

void RootDesktopObject::updateCurrentTimeFormat(QString fmt){
  //sanitize the time format as needed
  if(fmt.contains("z")){ fmt.replace("z",""); } //do not allow millisecond updates - too fast for the desktop
  fmt = fmt.simplified();
  //Verify that anything has changed first
  if(currentTimeFormat == fmt && currentTimeTimer->isActive()){ return; } //nothing changed
  if(currentTimeTimer->isActive()){ currentTimeTimer->stop(); } //make sure this does not trigger during the changeover
  currentTimeFormat = fmt;
  int interval = 1000; //default to 1 second intervals
  //Adjust the refresh time for the clock based on the smallest unit requested
  if(fmt.contains("s")){ interval=500; } //1/2 second pings for 1-second displays
  else if(fmt.contains("m") || currentTimeFormat.isEmpty()){ interval = 5000; } //5 second pings for 1-minute displays
  else if(fmt.contains("h")){ interval = 30000; } //30 second pings for 1-hour displays
  currentTimeTimer->setInterval(interval);
  updateCurrentTime(); //refresh the currently-available time
  QTimer::singleShot(0,currentTimeTimer, SLOT(start()) );//start the update timer
}

void RootDesktopObject::logout(){
  //Emit the logout signal in a few ms (let the display close/sync first)
  QTimer::singleShot(50, this, SIGNAL(startLogout()));
}

void RootDesktopObject::lockscreen(){
  emit lockScreen();
}

void RootDesktopObject::mousePositionChanged(bool lowerall){
  emit mouseMoved();
  // Go through the transparent windows (in order of high->low in stack)
  // and raise/lower the transparent overlays as needed
  QPoint pos = QCursor::pos();
  for(int i=window_objects.length()-1; i>=0; i--){
    if(window_objects[i]->geometry().contains(pos) ){
      if(last_window_up!= window_objects[i]){
        if(last_window_up!=0){ Lumina::NWS->lowerWindow(last_window_up); }
	Lumina::NWS->raiseWindow(window_objects[i]);
        last_window_up = window_objects[i];
      }
      if(!lowerall){ return; } //found the currently-hovered window
    }else if(lowerall){
      Lumina::NWS->lowerWindow(window_objects[i]);
    }
  }
  //failover for when no window has the mouse over it (lower all of them)
  if(last_window_up!=0 && !lowerall){ Lumina::NWS->lowerWindow(last_window_up); }
}

void RootDesktopObject::launchApp(QString appOrPath){
  emit launchApplication(appOrPath);
}

//C++ Access Functions (simplifications for the QML ones)
QList<NativeWindowObject*> RootDesktopObject::windowObjects(){
  return window_objects;

}
QList<NativeWindowObject*> RootDesktopObject::trayWindowObjects(){
  return tray_window_objects;
}

QList<ScreenObject*> RootDesktopObject::screenObjects(){
  return s_objects;
}

QRegion* RootDesktopObject::availableGeometry(){
  return &session_avail_geom;
}

// === PUBLIC SLOTS ===
void RootDesktopObject::updateScreens(){
  QList<QScreen*> scrns = QApplication::screens();
  QList<ScreenObject*> tmp; //copy of the internal array initially
  for(int i=0; i<scrns.length(); i++){
    bool found = false;
    for(int j=0; j<s_objects.length() && !found; j++){
      if(s_objects[j]->name()==scrns[i]->name()){ found = true; tmp << s_objects.takeAt(j); }
    }
    if(!found){
      //Create new screen object
      tmp << new ScreenObject(scrns[i], this);
      connect(tmp.last(), SIGNAL(availableGeomChanged()), this, SLOT(availableScreenGeomChanged()) );
    }
  }
  //Delete any leftover objects
  for(int i=0; i<s_objects.length(); i++){ s_objects[i]->deleteLater(); }
  s_objects = tmp;
  emit screensChanged();
  for(int i=0; i<s_objects.length(); i++){
    s_objects[i]->emit geomChanged();
  }
}

void RootDesktopObject::ChangeWallpaper(QString screen, QString value){
  for(int i=0; i<s_objects.length(); i++){
    if(s_objects[i]->name()==screen){ s_objects[i]->setBackground(value); break; }
  }
}

QString RootDesktopObject::CurrentWallpaper(QString screen){
  for(int i=0; i<s_objects.length(); i++){
    if(s_objects[i]->name()==screen){ return s_objects[i]->background();}
  }
  return ""; //unknown
}



// === PRIVATE ===

// === PRIVATE SLOTS ===
void RootDesktopObject::updateCurrentTime(){
  QDateTime DT = QDateTime::currentDateTime();
  QString tmp;
  if(currentTimeFormat.isEmpty()){ tmp = DT.toString(Qt::DefaultLocaleShortDate); }
  else{ tmp = DT.toString(currentTimeFormat); }
  if(tmp!=currentTimeString){ //prevent sending signals to update the interface if nothing changed
    currentDateTimeStruct = DT;
    currentTimeString = tmp;
    emit currentTimeChanged();
    //qDebug() << "Current Time Changed:" << currentTimeString;
  }
}

void RootDesktopObject::availableScreenGeomChanged(){
  if(availgeomTimer->isActive()){ availgeomTimer->stop(); }
  availgeomTimer->start();
}

void RootDesktopObject::submitSessionGeom(){
 //TODO - read off the available geom from each ScreenObject and register that with NativeWindowSystem
}