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

// === PUBLIC ===
LShortcutEvents::LShortcutEvents(){
  WIN = 0;
  clearTimer = 0;
  evaluated = false;
}

LShortcutEvents::~LShortcutEvents(){

}

void LShortcutEvents::start(){
  if(clearTimer==0){
    clearTimer = new QTimer(this);
    clearTimer->setInterval(2000); //2 seconds
    clearTimer->setSingleShot(true);
    connect(clearTimer, SIGNAL(timeout()), this, SLOT(clearKeys()) );
  }
}

void LShortcutEvents::stop(){
  clearKeys();
}

// === PRIVATE ===
void LShortcutEvents::CheckKeySequence(WId win){
  //Get the keyboard modifiers
  QString shortcut = keylistToString();
 //Now see if there is a match for this shortcut
  //  "strict" actions (operate even if a non-desktop window is active/focused)
  QString action = DesktopSettings::instance()->value(DesktopSettings::Keys, "strict/"+shortcut, "").toString();
  qDebug() << "Strict Action:" << "strict/"+shortcut << action;
  if(action.isEmpty() && win==0){
    //"loose" actions (operating on the desktop or root window itself)
    action = DesktopSettings::instance()->value(DesktopSettings::Keys, "desktop/"+shortcut, "").toString();
    qDebug() << "Desktop Action:" << "desktop/"+shortcut << action;
  }
  if(!action.isEmpty()){
    //Found a valid action - go ahead and evaluate it
    evaluateShortcutAction(action);
  }
}

void LShortcutEvents::CheckMouseSequence(WId win, NativeWindowSystem::MouseButton button, bool release){
  if(release && (button == NativeWindowSystem::WheelUp || button == NativeWindowSystem::WheelDown || button == NativeWindowSystem::WheelLeft || button == NativeWindowSystem::WheelRight)){ 
    return; //skip mouse release events for wheel actions (always come in pairs of press/release)
  }else if(keylist.isEmpty() || button == NativeWindowSystem::NoButton){ return; } //Never overwrite mouse clicks themselves - just combinations with key presses
  //Get the keyboard modifiers
  QString shortcut = keylistToString();
  //Add the mouse button to the shortcut
  switch(button){
    case NativeWindowSystem::LeftButton:
      shortcut.append("+LeftMouse");
      break;
    case NativeWindowSystem::RightButton:
      shortcut.append("+RightMouse");
      break;
    case NativeWindowSystem::MidButton:
      shortcut.append("+MiddleMouse");
      break;
    case NativeWindowSystem::BackButton:
      shortcut.append("+BackMouse");
      break;
    case NativeWindowSystem::ForwardButton:
      shortcut.append("+ForwardMouse");
      break;
    case NativeWindowSystem::TaskButton:
      shortcut.append("+TaskMouse");
      break;
    case NativeWindowSystem::WheelUp:
      shortcut.append("+WheelUp");
      break;
    case NativeWindowSystem::WheelDown:
      shortcut.append("+WheelDown");
      break;
    case NativeWindowSystem::WheelLeft:
      shortcut.append("+WheelLeft");
      break;
    case NativeWindowSystem::WheelRight:
      shortcut.append("+WheelRight");
      break;
    default:
      shortcut.clear();
  }
  if(shortcut.isEmpty()){ return; }
  //Now see if there is a match for this shortcut
  //  "strict" actions (operate even if a non-desktop window is active/focused)
  QString action = DesktopSettings::instance()->value(DesktopSettings::Keys, "strict/"+shortcut, "").toString();
  if(action.isEmpty() && win==0){
    //"loose" actions (operating on the desktop or root window itself)
    action = DesktopSettings::instance()->value(DesktopSettings::Keys, "desktop/"+shortcut, "").toString();
  }
  if(!action.isEmpty()){
    //Found a valid action - go ahead and evaluate it
    evaluateShortcutAction(action);
  }
}

QString LShortcutEvents::keylistToString(){
  if(keylist.isEmpty()){ return ""; }
  QString shortcut;
  QList<int> keys; int ckey = 0;
  for(int i=0; i<keylist.length(); i++){
    if(i == keylist.length()-1){ ckey+=keylist[i]; } //always treat the last key as a non-modifier
    else if(keylist[i] == Qt::Key_Control){ ckey+=Qt::CTRL; } //use the modifier form of the key
    else if(keylist[i] == Qt::Key_Alt){ ckey += Qt::ALT; }
    else if(keylist[i] == Qt::Key_Shift){ ckey += Qt::SHIFT; }
    else if(keylist[i] == Qt::Key_Meta){ ckey += Qt::META; }
    else{ ckey+= keylist[i]; keys << ckey; ckey = 0; } //non-modifier - need to finish current mod+key combo and start a new one
  }
  if(ckey!=0){ keys << ckey; } //add in the last one as well
  if(keys.length() < 1){ return  ""; }
  QKeySequence seq;
  switch(keys.length()){
    case 1:
      seq = QKeySequence(keys[0]); break;
    case 2:
      seq = QKeySequence(keys[0], keys[1]); break;
    case 3:
      seq = QKeySequence(keys[0], keys[1], keys[2]); break;
    default:
      seq = QKeySequence(keys[0],keys[1], keys[2], keys[3]); break;
  }
  /*qDebug() << "KeyList to String:";
  qDebug() << "  keys:" << seq;
  qDebug() << "  string:" << seq.toString();*/
  return seq.toString();
}

void LShortcutEvents::evaluateShortcutAction(QString action){
  qDebug() << "Found Shortcut Action:" << action;
  evaluated = true;
  if(action.startsWith("Exec:")){
    emit LaunchApplication(action.section(":",1,-1));
    return;
  }else if(action.startsWith("Launch:")){
    emit LaunchStandardApplication(action.section(":",1,-1));
  }
  //Specific Internal actions
  action = action.toLower();
  //Power Options
  if(action=="logout"){ emit StartLogout(); }
  else if(action=="reboot"){ emit StartReboot(); }
  else if(action=="shutdown"){ emit StartShutdown(); }
  else if(action=="show_leave_options"){ emit OpenLeaveDialog(); }
  else if(action=="lockscreen"){ emit LockSession(); }

}

// === PUBLIC SLOTS ===
void LShortcutEvents::KeyPress(WId window, Qt::Key key){
  if(window!=WIN){ keylist.clear(); WIN = window; }
  /*if(!keylist.contains(key)){
    //Put it in the list in ascending order
    bool found = false;
    for(int i=0; i<keylist.length() && !found; i++){
      if(keylist[i]>key){ keylist.insert(i,key); found = true; }
    }
    if(!found){ keylist << key;  }
    evaluated = false;
  }*/
  if(!keylist.isEmpty()){
    if( keylist.last()!=key ){ keylist << key; }
  }else{
    keylist << key;
  }
  //Evaluate the key sequence only when the first one is released
  clearTimer->start(); //will "restart" if already running
}

void LShortcutEvents::KeyRelease(WId window, Qt::Key key){
  if(window!=WIN){ keylist.clear(); return; }
  if(!evaluated){ CheckKeySequence(WIN); } //run this "before" removing the key from the list
  for(int i=keylist.length()-1; i>=0; i--){
    if(keylist[i] == key){ keylist.removeAt(i); break; }
  }
  clearTimer->start(); //will "restart" if already running
}

void LShortcutEvents::MousePress(WId window, NativeWindowSystem::MouseButton button){
  //We do not provide shortcuts for combinations of mouse buttons - just mouse+keyboard combinations
  CheckMouseSequence(window, button, false);
  clearTimer->start(); //will "restart" if already running
}

void LShortcutEvents::MouseRelease(WId window, NativeWindowSystem::MouseButton button){
  //We do not provide shortcuts for combinations of mouse buttons - just mouse+keyboard combinations
  CheckMouseSequence(window, button, true);
  clearTimer->start(); //will "restart" if already running
}

void LShortcutEvents::clearKeys(){
  keylist.clear();
  WIN = 0;
  if(clearTimer!=0){ clearTimer->stop(); }
}