/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, version 2.1 of the License.

*

* 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 Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with this program.  If not,

* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".

*

* Description:

* This class extends ToolbarChromeItem. It paints the toolbar background

* and controls toolbar visibility in the content view.

*

*/

#include "ContentToolbarChromeItem.h"

#include "ChromeItem.h"

#include "WebChromeContainerSnippet.h"

#include "ContentToolbarSnippet.h"

#include "GWebContentView.h"

#include "mostvisitedsnippet.h"

#include "webpagecontroller.h"

#include "ViewController.h"

#include "ChromeEffect.h"

#include <QTimeLine>

#include <QDebug>

#define TOOLBAR_MARGIN 4

#define TOOLBAR_ANIMATION_DURATION 200

#define TOOLBAR_INACTIVITY_DURATION 5000

namespace GVA {

  ToolbarFadeAnimator::ToolbarFadeAnimator(): m_timeLine(NULL)

  {

  }

  ToolbarFadeAnimator::~ToolbarFadeAnimator() {

    if (m_timeLine)

      delete m_timeLine;

  }

  void ToolbarFadeAnimator::start(bool visible) {

    //qDebug() << __PRETTY_FUNCTION__ << visible;

    if (!m_timeLine) {

      m_timeLine = new QTimeLine(TOOLBAR_ANIMATION_DURATION);

      connect(m_timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(valueChange(qreal)));

      connect(m_timeLine, SIGNAL(finished()), this, SIGNAL(finished()));

    }

    else {

      m_timeLine->stop();

    }

    if (!visible) {

      m_timeLine->setDirection(QTimeLine::Forward);

    }

    else {

      m_timeLine->setDirection(QTimeLine::Backward);

    }

    m_timeLine->start();

  }

  void ToolbarFadeAnimator::stop() {

    //qDebug() << __PRETTY_FUNCTION__ ;

    m_timeLine->stop();

  }

  void ToolbarFadeAnimator::valueChange(qreal step) {

    emit  updateVisibility(step);

  }

  ContentToolbarChromeItem::ContentToolbarChromeItem(ChromeSnippet* snippet, QGraphicsItem* parent)

      : ToolbarChromeItem(snippet, parent),

      m_background(NULL),

      m_state(CONTENT_TOOLBAR_STATE_FULL),

      m_autoHideToolbar(true),

      m_timerState(CONTENT_TOOLBAR_TIMER_STATE_ALLOW)

  {

    m_inactivityTimer = new QTimer(this);

    connect(m_inactivityTimer, SIGNAL(timeout()), this, SLOT(onInactivityTimer()));

    m_animator = new ToolbarFadeAnimator();

    connect(m_animator, SIGNAL(updateVisibility(qreal)), this, SLOT(onUpdateVisibility(qreal)));

    connect(m_animator, SIGNAL(finished()), this, SLOT(onAnimFinished()));

    m_maxOpacity = m_bgopacity = opacity();   

    if (m_autoHideToolbar ) {

       connect(m_snippet->chrome(), SIGNAL(chromeComplete()), this, SLOT(onChromeComplete()));

    }

    setFlags(QGraphicsItem::ItemDoesntPropagateOpacityToChildren);

  }

  ContentToolbarChromeItem::~ContentToolbarChromeItem()

  {

    if (m_background )

        delete m_background;

    delete m_inactivityTimer;

    delete m_animator;

  }

  void ContentToolbarChromeItem::resizeEvent(QGraphicsSceneResizeEvent * ev)

  {

    //qDebug() << __PRETTY_FUNCTION__ << boundingRect();

    ToolbarChromeItem::resizeEvent(ev);

    addFullBackground();

  }

  void ContentToolbarChromeItem::mousePressEvent(QGraphicsSceneMouseEvent * ev)

  {

      // If we are not in full state, ignore the event. Once igonre, none of the

      // other mouse events are received until the next mouse press

      if (m_state == CONTENT_TOOLBAR_STATE_PARTIAL ) {

          ev->ignore();

      }

      else {

          ChromeSnippet * mv = m_snippet->chrome()->getSnippet("MostVisitedViewId");

          // Let mostvisited snippet handle the key press if it is visible

          if (mv && mv->isVisible() ){

              ev->ignore();

          }

      }

  }

  void ContentToolbarChromeItem::mouseReleaseEvent(QGraphicsSceneMouseEvent * ev)

  {

      Q_UNUSED(ev);

      // Do nothing - prevent the event from trickling down

  }

  void ContentToolbarChromeItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* opt, QWidget* widget)

  {

    Q_UNUSED(opt)

    Q_UNUSED(widget)

//    qDebug() << __PRETTY_FUNCTION__ << m_state;

    painter->save();

    painter->setRenderHint(QPainter::Antialiasing);

    painter->setPen(pen());

    painter->setOpacity(m_bgopacity);

    switch (m_state) {

        case CONTENT_TOOLBAR_STATE_PARTIAL:

          ToolbarChromeItem::paint(painter, opt, widget);

          break;

        case CONTENT_TOOLBAR_STATE_ANIM_TO_FULL:

        case CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL:

          ToolbarChromeItem::paint(painter, opt, widget);

        case CONTENT_TOOLBAR_STATE_FULL:

          // fill path with color

          painter->fillPath(*m_background,QBrush(grad()));

          painter->drawPath(*m_background);

          if(m_state == CONTENT_TOOLBAR_STATE_FULL && !isEnabled()) {

              // Disabled, apply whitewash.

              ChromeEffect::paintDisabledRect(painter, opt->exposedRect);

          }

          break;

        default:

          qDebug() << "ContentToolbarChromeItem::paint invalid state" ;

          break;

    }

    // restore painter

    painter->restore();

  }

  void ContentToolbarChromeItem::setSnippet(ChromeSnippet* snippet) {

    ToolbarChromeItem::setSnippet(snippet);

    m_maxOpacity = m_bgopacity = opacity();

    if (m_autoHideToolbar ) {

        connect(snippet->chrome(), SIGNAL(chromeComplete()), this, SLOT(onChromeComplete()));

    }

  }

  void ContentToolbarChromeItem::onChromeComplete() {

    GWebContentView* webView  = static_cast<GWebContentView*> (m_snippet->chrome()->getView("WebView"));

    //qDebug() << __PRETTY_FUNCTION__ << webView;

    if (webView ) {

        connect(webView, SIGNAL(loadFinished(bool)), this, SLOT(onLoadFinished(bool)));

        connect(webView, SIGNAL(loadStarted()), this, SLOT(onLoadStarted()));

#ifdef BEDROCK_TILED_BACKING_STORE

        connect(webView, SIGNAL(contextEvent(::WebViewEventContext *)), this, SLOT(resetTimer()));

#else

        connect(webView->widget(), SIGNAL(contextEvent(::WebViewEventContext *)), this, SLOT(resetTimer()));

#endif

    }

  }

  void ContentToolbarChromeItem::onLoadStarted() {

      m_timerState = CONTENT_TOOLBAR_TIMER_STATE_ALLOW;

      stopInactivityTimer();

  }

  void ContentToolbarChromeItem::onLoadFinished(bool ok) {

    Q_UNUSED(ok);

    //qDebug() << __PRETTY_FUNCTION__ << m_state << "Timer Allowed" << m_timerState;

    if (m_autoHideToolbar  && m_timerState == CONTENT_TOOLBAR_TIMER_STATE_ALLOW) {

        ControllableViewBase* curView = m_snippet->chrome()->viewController()->currentView();

        if (curView && curView->type() == "webView") {

            GWebContentView * gView = qobject_cast<GWebContentView*> (curView);

            bool isSuperPage = gView ? gView->currentPageIsSuperPage() : false;

        // Start inactivity timer if full toolbar is visible 

        if (!isSuperPage && m_state ==  CONTENT_TOOLBAR_STATE_FULL ) 

            m_inactivityTimer->start(TOOLBAR_INACTIVITY_DURATION);

        }

    }

  }

  void ContentToolbarChromeItem::resetTimer() {

      m_timerState = CONTENT_TOOLBAR_TIMER_STATE_NONE;

      stopInactivityTimer();

  }

  void ContentToolbarChromeItem::stopInactivityTimer() {

    //qDebug() << __PRETTY_FUNCTION__<< m_state << " Timer Active: " << m_inactivityTimer->isActive(); 

    // Stop inactivity timer 

    if (m_inactivityTimer->isActive() )

        m_inactivityTimer->stop();

  }

  void ContentToolbarChromeItem::onInactivityTimer() {

    //qDebug() << __PRETTY_FUNCTION__ << m_state;

    //We are here because inactivity timer timed out. So we have to be in full toolbar state with no

    // popups. So change fade to Partial state after stopping inactivity timer

    m_inactivityTimer->stop();

    changeState(CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL, true);

  }

  void ContentToolbarChromeItem::onSnippetMouseEvent( QEvent::Type type) {

    //qDebug() << __PRETTY_FUNCTION__ << type ;

    if (type == QEvent::MouseButtonPress || type ==  QEvent::GraphicsSceneMousePress) {

        resetTimer();

    } 

  }

  void ContentToolbarChromeItem::addLinkedChild(ChromeSnippet * s) {

      m_linkedChildren.append(s);

  }

  void ContentToolbarChromeItem::toggleMiddleSnippet() {

      //qDebug() << "TOGGLE MIDDLE : " << m_state;

      switch (m_state) {

         case CONTENT_TOOLBAR_STATE_PARTIAL:

            changeState(CONTENT_TOOLBAR_STATE_ANIM_TO_FULL);

            break;

          case CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL:

            // Stop animation and change to full immediately

            m_animator->stop();

            changeState(CONTENT_TOOLBAR_STATE_FULL, false);

            break;

          case CONTENT_TOOLBAR_STATE_ANIM_TO_FULL:

            // Do nothing here - will reset inactivity timer when

            // animation completes

            break;

          case CONTENT_TOOLBAR_STATE_FULL:

            // if MV is active then wait for it to hide before changing the toolbar state

            if (mvSnippetVisible()) {

                changeState(CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL, false);

            }

            else {

                changeState(CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL, true);

            }

            break;

          default:

            break;

        }

  }

  void ContentToolbarChromeItem::onMVCloseComplete() {

//    qDebug() << __PRETTY_FUNCTION__;

    ChromeSnippet * mv = m_snippet->chrome()->getSnippet("MostVisitedViewId");

    disconnect(mv, SIGNAL(mostVisitedSnippetCloseComplete()) , this, SLOT(onMVCloseComplete()));

    // MostVisitedSnippet animation complete, so let's do toolbar animation

    if (m_state == CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL)

      changeState(CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL, true);

  }

  void ContentToolbarChromeItem::onUpdateVisibility(qreal step) {

    //qDebug() << __PRETTY_FUNCTION__ << step << m_bgopacity << opacity();

    // Value we get is 1.0 based, adjust it based on our max opacity

    qreal value = step - (1.0 - m_maxOpacity);

    value =  (value > 0)? value: 0.0;

    if (m_bgopacity != value ) {

      m_bgopacity = value;

      setOpacity(m_maxOpacity - value);

      ContentToolbarSnippet * s = static_cast<ContentToolbarSnippet*>(m_snippet);

      s->middleSnippet()->widget()->setOpacity(value);

      update();

    }

  }

  void ContentToolbarChromeItem::onAnimFinished() {

    ContentToolbarState state = CONTENT_TOOLBAR_STATE_INVALID;

    bool animate = false;

    //qDebug() << __PRETTY_FUNCTION__ << m_state;

    switch (m_state) {

        case CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL:

          state = CONTENT_TOOLBAR_STATE_PARTIAL; 

          break;

        case CONTENT_TOOLBAR_STATE_ANIM_TO_FULL:

          state = CONTENT_TOOLBAR_STATE_FULL; 

          animate = true;

          break;

        default:

          break;

    }

    ContentToolbarSnippet * s = static_cast<ContentToolbarSnippet*>(m_snippet);

    s->handleToolbarStateChange(state);

    changeState(state, animate);

    //qDebug() << __PRETTY_FUNCTION__ << m_state;

  }

  void ContentToolbarChromeItem::addFullBackground() {

    //qDebug() << __PRETTY_FUNCTION__ ;

    qreal roundness((boundingRect().height() -TOOLBAR_MARGIN)/2);

    QRectF r(1, 1, boundingRect().width()-TOOLBAR_MARGIN, boundingRect().height()-TOOLBAR_MARGIN);

    if (m_background ) {

        delete m_background;

        m_background = NULL;

    }

    m_background = new QPainterPath();

    m_background->addRoundedRect(r, roundness, roundness);

  }

  void ContentToolbarChromeItem::stateEnterFull(bool animate) {

    //qDebug() <<__PRETTY_FUNCTION__ ;

    ContentToolbarSnippet * s = static_cast<ContentToolbarSnippet*>(m_snippet);

    // Show the middle snippet and reset the opacity if we are here directly with no aniamtion

    if (!animate) {

      m_bgopacity = 0.75;

      s->middleSnippet()->show();

    }

    m_state = CONTENT_TOOLBAR_STATE_FULL;

    s->middleSnippet()->widget()->setOpacity(1.0);

    // TODO: specify the rect to be updated to avoid full repaint

    update();

  }

  void ContentToolbarChromeItem::stateEnterPartial(bool animate) {

    //qDebug() <<__PRETTY_FUNCTION__ ;

    Q_UNUSED(animate);

    ContentToolbarSnippet * s = static_cast<ContentToolbarSnippet*>(m_snippet);

    // Explicity hide the linked snippets so that toggle button javascript gets the right

    // signals that it is expecting

    hideLinkedChildren();

    s->middleSnippet()->hide();

    m_state = CONTENT_TOOLBAR_STATE_PARTIAL;

  }

  void ContentToolbarChromeItem::stateEnterAnimToFull(bool animate) {

    //qDebug() <<__PRETTY_FUNCTION__ ;

    Q_UNUSED(animate);

    ContentToolbarSnippet * s = static_cast<ContentToolbarSnippet*>(m_snippet);

    m_state = CONTENT_TOOLBAR_STATE_ANIM_TO_FULL;

    s->middleSnippet()->show();

    m_animator->start(false);

  }

  void ContentToolbarChromeItem::stateEnterAnimToPartial(bool animate) {

    m_state = CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL;

    if (animate ) {

      m_animator->start(true);

    }

    else {

      MostVisitedSnippet * mv = static_cast<MostVisitedSnippet *>(m_snippet->chrome()->getSnippet("MostVisitedViewId"));

      connect(mv, SIGNAL(mostVisitedSnippetCloseComplete()) , this, SLOT(onMVCloseComplete()));

      mv->close();

    }

  }

  void ContentToolbarChromeItem::changeState( ContentToolbarState state, bool animate){

    onStateEntry(state, animate);

  }

  void ContentToolbarChromeItem::onStateEntry(ContentToolbarState state, bool animate){

   //qDebug() << __PRETTY_FUNCTION__ ;

   switch (state) {

        case CONTENT_TOOLBAR_STATE_PARTIAL:

          stateEnterPartial(animate);

          break;

        case CONTENT_TOOLBAR_STATE_ANIM_TO_FULL:

          stateEnterAnimToFull(animate);

          break;

        case CONTENT_TOOLBAR_STATE_ANIM_TO_PARTIAL:

          stateEnterAnimToPartial(animate);

          break;

        case CONTENT_TOOLBAR_STATE_FULL:

          stateEnterFull(animate);

          break;

        default:

          qDebug() << "ContentToolbarChromeItem::onStateEntry -  invalid state" ;

          break;

    }

  }

  bool ContentToolbarChromeItem::mvSnippetVisible() {

    ChromeSnippet * mv = m_snippet->chrome()->getSnippet("MostVisitedViewId");

    bool result = false;

    if (mv && mv->isVisible() ) {

      result = true;

    }

    return result;

  }

  void ContentToolbarChromeItem::hideLinkedChildren() {

    for (int i=0; i < m_linkedChildren.count() ; i++) {

      m_linkedChildren.at(i)->hide();

    }

  }

} // end of namespace GVA