#include "KonvergoWindow.h"
#include <QTimer>
#include <QJsonObject>
#include <QScreen>
#include <QQuickItem>
#include <QGuiApplication>

#include "input/InputKeyboard.h"
#include "settings/SettingsComponent.h"
#include "settings/SettingsSection.h"
#include "system/SystemComponent.h"
#include "player/PlayerComponent.h"
#include "player/PlayerQuickItem.h"
#include "display/DisplayComponent.h"
#include "QsLog.h"
#include "power/PowerComponent.h"
#include "utils/Utils.h"
#include "Globals.h"
#include "EventFilter.h"

///////////////////////////////////////////////////////////////////////////////////////////////////
KonvergoWindow::KonvergoWindow(QWindow* parent) : QQuickWindow(parent), m_debugLayer(false), m_lastScale(1.0)
{
  // NSWindowCollectionBehaviorFullScreenPrimary is only set on OSX if Qt::WindowFullscreenButtonHint is set on the window.
  setFlags(flags() | Qt::WindowFullscreenButtonHint);

  m_infoTimer = new QTimer(this);
  m_infoTimer->setInterval(1000);

  installEventFilter(new EventFilter(this));

  connect(m_infoTimer, &QTimer::timeout, this, &KonvergoWindow::updateDebugInfo);

  InputComponent::Get().registerHostCommand("close", this, "close");
  InputComponent::Get().registerHostCommand("toggleDebug", this, "toggleDebug");
  InputComponent::Get().registerHostCommand("reload", this, "reloadWeb");
  InputComponent::Get().registerHostCommand("fullscreen", this, "toggleFullscreen");

#ifdef TARGET_RPI
  // On RPI, we use dispmanx layering - the video is on a layer below Konvergo,
  // and during playback the Konvergo window is partially transparent. The OSD
  // will be visible on top of the video as part of the Konvergo window.
  setColor(QColor("transparent"));
#else
  setColor(QColor("#111111"));
#endif

  QRect loadedGeo = loadGeometry();
  notifyScale(loadedGeo.size());

  connect(SettingsComponent::Get().getSection(SETTINGS_SECTION_MAIN), &SettingsSection::valuesUpdated,
          this, &KonvergoWindow::updateMainSectionSettings);

  connect(this, &KonvergoWindow::visibilityChanged,
          this, &KonvergoWindow::onVisibilityChanged);

  connect(this, &KonvergoWindow::enableVideoWindowSignal,
          this, &KonvergoWindow::enableVideoWindow, Qt::QueuedConnection);

  connect(&PlayerComponent::Get(), &PlayerComponent::windowVisible,
          this, &KonvergoWindow::playerWindowVisible);

  // this is using old syntax because ... reasons. QQuickCloseEvent is not public class
  connect(this, SIGNAL(closing(QQuickCloseEvent*)), this, SLOT(closingWindow()));

  connect(qApp, &QCoreApplication::aboutToQuit, this, &KonvergoWindow::closingWindow);

#ifdef KONVERGO_OPENELEC
  setVisibility(QWindow::FullScreen);
#else
  updateFullscreenState(false);
#endif

  // Check the always on top setting and activate it if necessary.
  updateAlwaysOnTopState();

  emit enableVideoWindowSignal();
}

/////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::closingWindow()
{
  if (!SettingsComponent::Get().value(SETTINGS_SECTION_MAIN, "fullscreen").toBool())
    saveGeometry();

  qApp->quit();
}

///////////////////////////////////////////////////////////////////////////////////////////////////
KonvergoWindow::~KonvergoWindow()
{
  DisplayComponent::Get().setApplicationWindow(nullptr);
}

///////////////////////////////////////////////////////////////////////////////////////////////////
bool KonvergoWindow::fitsInScreens(const QRect& rc)
{
  for(QScreen *screen : QGuiApplication::screens())
  {
    if (screen->virtualGeometry().contains(rc))
      return true;
  }
  return false;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::saveGeometry()
{
  QRect rc = geometry();

  // lets make sure we are not saving something craycray
  if (rc.size().width() < windowMinSize().width() || rc.size().height() < windowMinSize().height())
    return;

  if (!fitsInScreens(rc))
    return;

  QVariantMap map = {{"x", rc.x()}, {"y", rc.y()},
                     {"width", rc.width()}, {"height", rc.height()}};
  SettingsComponent::Get().setValue(SETTINGS_SECTION_STATE, "geometry", map);
  SettingsComponent::Get().setValue(SETTINGS_SECTION_STATE, "lastUsedScreen", screen()->name());
}

///////////////////////////////////////////////////////////////////////////////////////////////////
QRect KonvergoWindow::loadGeometry()
{
  QRect rc = loadGeometryRect();
  QScreen* myScreen = loadLastScreen();
  if (!myScreen)
    myScreen = screen();

  QRect nsize = rc;

  if (SettingsComponent::Get().value(SETTINGS_SECTION_MAIN, "fullscreen").toBool())
  {
    QLOG_DEBUG() << "Load FullScreen geo...";

    // On OSX we need to set the geometry to the size we want when we
    // return from fullscreen otherwise when we exit fullscreen it
    // will stay small or big. On Windows we need to set it to max
    // resolution for the screen (i.e. fullscreen) otherwise it will
    // just scale the webcontent to the minimum size we have defined
    //
#ifndef Q_OS_MAC
    nsize = myScreen->geometry();
#endif
    setGeometry(nsize);
    
    setScreen(myScreen);
  }
  else
  {
    setGeometry(nsize);
    saveGeometry();
  }

  return nsize;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
QRect KonvergoWindow::loadGeometryRect()
{
  // if we dont have anything, default to 720p in the middle of the screen
  QRect defaultRect = QRect((screen()->geometry().width() - webUISize().width()) / 2,
                            (screen()->geometry().height() - webUISize().height()) / 2,
                            webUISize().width(), webUISize().height());

  QVariantMap map = SettingsComponent::Get().value(SETTINGS_SECTION_STATE, "geometry").toMap();
  if (map.isEmpty())
    return defaultRect;

  QRect rc(map["x"].toInt(), map["y"].toInt(), map["width"].toInt(), map["height"].toInt());

  QLOG_DEBUG() << "Restoring geo:" << rc;

  if (!rc.isValid() || rc.isEmpty())
  {
    QLOG_DEBUG() << "Geo bad, going for defaults";
    return defaultRect;
  }

  QSize minsz = windowMinSize();

  // Clamp to min size if we have really small values in there
  if (rc.size().width() < minsz.width())
    rc.setWidth(minsz.width());
  if (rc.size().height() < minsz.height())
    rc.setHeight(minsz.height());

  // also make sure we are not putting windows outside the screen somewhere
  if (!fitsInScreens(rc))
  {
    QLOG_DEBUG() << "Could not fit stored geo into current screens";
    return defaultRect;
  }

  return rc;
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::enableVideoWindow()
{
  PlayerComponent::Get().setWindow(this);
  DisplayComponent::Get().setApplicationWindow(this);
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::setFullScreen(bool enable)
{
  QLOG_DEBUG() << "setting fullscreen = " << enable;

  SettingsComponent::Get().setValue(SETTINGS_SECTION_MAIN, "fullscreen", enable);
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::setAlwaysOnTop(bool enable)
{
  QLOG_DEBUG() << "setting always on top = " << enable;

  // Update the settings value.
  SettingsComponent::Get().setValue(SETTINGS_SECTION_MAIN, "alwaysOnTop", enable);
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::playerWindowVisible(bool visible)
{
  // adjust webengineview transparecy depending on player visibility
  QQuickItem *web = findChild<QQuickItem *>("web");
  if (web)
    web->setProperty("backgroundColor", visible ? "transparent" : "#111111");
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::updateMainSectionSettings(const QVariantMap& values)
{
  // update mouse visibility if needed
  if (values.find("disablemouse") != values.end())
  {
    SystemComponent::Get().setCursorVisibility(!SettingsComponent::Get().value(SETTINGS_SECTION_MAIN, "disablemouse").toBool());
  }

  if (values.find("alwaysOnTop") != values.end())
  {
    updateAlwaysOnTopState();
  }

  if (values.find("fullscreen") == values.end())
    return;

  updateFullscreenState();
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::updateFullscreenState(bool saveGeo)
{
  if (SettingsComponent::Get().value(SETTINGS_SECTION_MAIN, "fullscreen").toBool() || SystemComponent::Get().isOpenELEC())
  {
    // if we were go from windowed to fullscreen
    // we want to store our current windowed position
    if (!isFullScreen() && saveGeo)
      saveGeometry();

    setVisibility(QWindow::FullScreen);
  }
  else
  {
    setVisibility(QWindow::Windowed);
    loadGeometry();
  }
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::updateAlwaysOnTopState()
{
  QLOG_DEBUG() << "Changing always-on-top state";
  Qt::WindowFlags forceOnTopFlags = Qt::WindowStaysOnTopHint;
#ifdef Q_OS_LINUX
  forceOnTopFlags = forceOnTopFlags | Qt::X11BypassWindowManagerHint;
#endif

  if(SettingsComponent::Get().value(SETTINGS_SECTION_MAIN, "alwaysOnTop").toBool())
  {
    setFlags(flags() | forceOnTopFlags);
  }
  else
  {
    setFlags(flags() & ~forceOnTopFlags);
  }

  show();
}

///////////////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::onVisibilityChanged(QWindow::Visibility visibility)
{
  QLOG_DEBUG() << (visibility == QWindow::FullScreen ? "FullScreen" : "Windowed") << "visbility set to " << visibility;

  if (visibility == QWindow::Windowed)
    loadGeometry();

  if (visibility == QWindow::FullScreen)
    PowerComponent::Get().setFullscreenState(true);
  else if (visibility == QWindow::Windowed)
    PowerComponent::Get().setFullscreenState(false);

  notifyScale(size());
}

/////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::focusOutEvent(QFocusEvent * ev)
{
#ifdef Q_OS_WIN32
  // Do this to workaround DWM compositor bugs with fullscreened OpenGL applications.
  // The compositor will not properly redraw anything when focusing other windows.
  if (visibility() == QWindow::FullScreen && SettingsComponent::Get().value(SETTINGS_SECTION_MAIN, "minimizeOnDefocus").toBool())
  {
    QLOG_DEBUG() << "minimizing window";
    showMinimized();
  }
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::RegisterClass()
{
  qmlRegisterType<KonvergoWindow>("Konvergo", 1, 0, "KonvergoWindow");
}

/////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::onScreenCountChanged(int newCount)
{
  updateFullscreenState(false);
}

/////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::updateDebugInfo()
{
  if (m_systemDebugInfo.size() == 0)
    m_systemDebugInfo = SystemComponent::Get().debugInformation();
  m_debugInfo = m_systemDebugInfo;
  m_debugInfo += DisplayComponent::Get().debugInformation();
  PlayerQuickItem* video = findChild<PlayerQuickItem*>("video");
  if (video)
    m_debugInfo += video->debugInfo();
  m_videoInfo = PlayerComponent::Get().videoInformation();
  emit debugInfoChanged();
}

/////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::toggleDebug()
{
  if (property("showDebugLayer").toBool())
  {
    m_infoTimer->stop();
    setProperty("showDebugLayer", false);
  }
  else
  {
    m_infoTimer->start();
    updateDebugInfo();
    setProperty("showDebugLayer", true);
  }
}

/////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::notifyScale(const QSize& size)
{
  qreal scale = CalculateScale(size);
  if (scale != m_lastScale)
  {
    QLOG_DEBUG() << "windowScale updated to:" << scale << "webscale:" << CalculateWebScale(size, devicePixelRatio());
    m_lastScale = scale;

    emit SystemComponent::Get().scaleChanged(CalculateWebScale(size, devicePixelRatio()));
  }
  emit webScaleChanged();
}

/////////////////////////////////////////////////////////////////////////////////////////
void KonvergoWindow::resizeEvent(QResizeEvent* event)
{
  QLOG_DEBUG() << "resize event:" << event->size();

  // This next block should never really be needed in a prefect world...
  // Unfortunatly this is an imperfect world and on windows sometimes what
  // would happen on startup is that we got a resize event that would make
  // the window much smaller than fullscreen.
  //
  if (isFullScreen())
  {
    QSize fsSize = screen()->size();
    if (event->size().width() < fsSize.width() || event->size().height() < fsSize.height())
    {
      QLOG_DEBUG() << "Ignoring resize event when in fullscreen...";
      return;
    }
  }

  notifyScale(event->size());
  QQuickWindow::resizeEvent(event);
}

/////////////////////////////////////////////////////////////////////////////////////////
#define ROUND(x) (qRound(x * 1000) / 1000.0)

/////////////////////////////////////////////////////////////////////////////////////////
qreal KonvergoWindow::CalculateScale(const QSize& size)
{
  qreal horizontalScale = (qreal)size.width() / (qreal)WEBUI_SIZE.width();
  qreal verticalScale = (qreal)size.height() / (qreal)WEBUI_SIZE.height();
  return ROUND(qMin(horizontalScale, verticalScale));
}

/////////////////////////////////////////////////////////////////////////////////////////
qreal KonvergoWindow::CalculateWebScale(const QSize& size, qreal devicePixelRatio)
{
  qreal horizontalScale = (qreal)size.width() / (qreal)WEBUI_SIZE.width();
  qreal verticalScale = (qreal)size.height() / (qreal)WEBUI_SIZE.height();

  qreal minScale = qMin(horizontalScale, qMin(verticalScale, (qreal)(WEBUI_MAX_HEIGHT / devicePixelRatio) / (qreal)WEBUI_SIZE.height()));
  qreal minWinScale = 240.0 / (qreal)WEBUI_SIZE.height();
  return ROUND(qMax(minWinScale, minScale));
}

/////////////////////////////////////////////////////////////////////////////////////////
QScreen* KonvergoWindow::loadLastScreen()
{
  QString screenName = SettingsComponent::Get().value(SETTINGS_SECTION_STATE, "lastUsedScreen").toString();
  if (screenName.isEmpty())
    return nullptr;

  for (QScreen* scr : QGuiApplication::screens())
  {
    if (scr->name() == screenName)
      return scr;
  }

  QLOG_DEBUG() << "Tried to find screen:" << screenName << "but it was not present";

  return nullptr;
}