/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#include <hbaction.h>

#include <QApplication>

#include <QTimer>

#include "irviewmanager.h"

#include "irapplication.h"

#include "irmainview.h"

#include "ircategoryview.h"

#include "irstationsview.h"

#include "irnowplayingview.h"

#include "irsearchchannelsview.h"

#include "irfavoritesview.h"

#include "irhistoryview.h"

#include "irsettingsview.h"

#include "iropenwebaddressview.h"

#include "irsonghistoryview.h"

#include "irtermsconsview.h"

#include "irplsview.h"

#include "irstationdetailsview.h"

const int KCrossLineWidth = 30; // pixel

const double KCrossLineMinLenth = 180.0; // pixel

const int KCrossLineTimeInterval = 1500; // ms

const int KExitTimeInterval = 800; // ms, used for showing cross Line

const int KCrossLineMinAngle = 15; // degree

const int KCrossLineMaxAngle = 75; // degree

static bool crossLineReady(const QLineF &aLine);

static bool crossLineIntersected(const QLineF &aLineA, const QLineF &aLineB);

enum CrossLineAngleType

{

    EPositiveAngle = 0,  // Line within 1,3 quadrant

    ENegativeAngle       // Line within 2,4 quadrant

};

static CrossLineAngleType crossLineAngleType(const QLineF &aLine);

/*

 * Description : constructor.

 *               add a softkey action to it in order to know that back buttion is touched.

 */

IRViewManager::IRViewManager() : iApplication(NULL),

                                 iCrossLineAReady(false),

                                 iCrossLineBReady(false),

                                 iCrossLineEnable(true),

                                 iCrossLineShowing(false),

                                 iCrossLineTimer(NULL),

                                 iExitTimer(NULL),

                                 iExiting(false)

{

    iBackAction = new HbAction(Hb::BackNaviAction, this);

    connect(iBackAction, SIGNAL(triggered()), this, SLOT(backToPreviousView()));

    iExitAction = new HbAction(Hb::QuitNaviAction, this);

    connect(iExitAction, SIGNAL(triggered()), this, SLOT(lower()));

    connect(this, SIGNAL(viewReady()), this, SLOT(handleViewReady()));

    connect(this, SIGNAL(currentViewChanged(HbView*)), this, SLOT(handleCurrentViewChanged(HbView*)));

    iCrossLineTimer = new QTimer(this);

    iExitTimer = new QTimer(this);

    iCrossLineTimer->setSingleShot(true);

    iExitTimer->setSingleShot(true);

    connect(iCrossLineTimer,SIGNAL(timeout()),this,SLOT(crossLineReset()));

    connect(iExitTimer,SIGNAL(timeout()),this,SLOT(exitTimeout()));     

}

/*

 * Description : destructor

 */

IRViewManager::~IRViewManager()

{

}

void IRViewManager::setApplication(IRApplication *aApplication)

{

    iApplication = aApplication;

}

/*

 * Description : get a pointer to a specified view. If the view is not created yet,

 *               view manager can create it and then return pointer to it.

 * Parameters  : aViewId : the view's id

 *               aCreateIfNotExist : whether or not create a view if it doesn't exist

 * Return      : pointer to the specified view.

 */

IRBaseView* IRViewManager::getView(TIRViewId aViewId, bool aCreateIfNotExist)

{

    int viewNumber = views().count();

    for (int i = 0; i < viewNumber; ++i)

    {

        IRBaseView* addedView = static_cast<IRBaseView*>(views().at(i));

        if (addedView && addedView->id() == aViewId)

        {

            return addedView;

        }

    }

    if (aCreateIfNotExist)

    {

        IRBaseView* newView = createView(iApplication, aViewId);

        addView(newView);

        return newView;

    }

    return NULL;

}

TIRViewId IRViewManager::getExitingView()

{

    if(0 == views().count())

    {

        return EIRView_InvalidId;

    }

    else

    {

        IRBaseView* lastView = static_cast<IRBaseView*>(currentView());

        if(lastView->testFlag(IRBaseView::EViewFlag_StickyViewEnabled))

        {

            return lastView->id();

        }

        if(iViewStack.empty())

        {

            return EIRView_InvalidId;

        }

        for(int i = iViewStack.size()-1; i >= 0 ; i--)

        {

            IRBaseView* lastView = iViewStack.at(i);

            if(lastView->testFlag(IRBaseView::EViewFlag_StickyViewEnabled))

            {

                return lastView->id();

            }

        }    

        return EIRView_InvalidId;

    }

}

/*

 * Description : Judge if a view is in the view stack.

 * Parameters  : aViewId : the view's id

 * Return      : true  : the view is in view stack

 *               false : the view is not in view stack

 */

bool IRViewManager::isViewInStack(TIRViewId aViewId) const

{

    int numberOfViewsInStack = iViewStack.count();

    for (int i = numberOfViewsInStack-1; i >=0 ; i--)

    {

        IRBaseView* view = iViewStack[i];

        if (view)

        {

            if (view->id() == aViewId)

            {

               return true;

            }

        }

    }

    return false;

}

/*

 * Description : Activate a view specified aViewId. The new view will be current view.

 *               Old current view will be deactivated and pushed into view stack if 

 *               aStackCurrent is true.

 * Parameters  : aViewId : the view's id.

 *               aStackCurrent : whether or not push current view into view stack

 * Return      : None

 */

void IRViewManager::activateView(TIRViewId aViewId, bool aPushCurrentView)

{    

    if (isViewInStack(aViewId))

    {

        backToView(aViewId);

        return;

    }

    IRBaseView *baseView = static_cast<IRBaseView*>(currentView());

    if (baseView && baseView->id() == aViewId)

    {

        baseView->updateView();

        return;

    }

    IRBaseView *view = getView(aViewId, true);

    if (view)

    {

        if (view->testFlag(IRBaseView::EViewFlag_ClearStackWhenActivate))

        {

            clearStack();

        }

        else

        {    if (aPushCurrentView)

             {

                 if (baseView && !baseView->testFlag(IRBaseView::EViewFlag_UnStackable))

                 {

                     iViewStack.push(baseView);

                 }

             }

             //deactivate current view

             if (baseView)

             {

                 baseView->handleCommand(EIR_ViewCommand_DEACTIVATE, EIR_ViewCommandReason_Hide);

             }

        }      

        switchToNextView(view);        

    }

}

/*

 * Description : Activate a view specified by aView. The new view will be current view.

 *               Old current view will be deactivated and pushed into view stack if 

 *               aStackCurrent is true.

 * Parameters  : aView : pointer to the view to be activated.

 *               aStackCurrent : whether or not push current view into view stack

 */

void IRViewManager::activateView(IRBaseView *aView, bool aPushCurrentView)

{

    if (aView == NULL)

    {

        return;

    }

    activateView(aView->id(), aPushCurrentView);

}

/*

 * Description : back view stack until a view whose id is aViewId.

 *               The view will become current view.

 * Parameters  : aViewId : the view's id

 */

void IRViewManager::backToView(TIRViewId aViewId)

{

    if (aViewId == currentViewId())

    {

        return;

    }

    //step 1 : back current view

    IRBaseView *topView = static_cast<IRBaseView*>(currentView());

    if (topView)

    {

        topView->handleCommand(EIR_ViewCommand_DEACTIVATE, EIR_ViewCommandReason_Back);

    }

    //step 2 : back the views in view stack

    while (!iViewStack.isEmpty())

    {

        topView = iViewStack.top();

        if (topView->id() == aViewId)

        {

            break;

        }

        topView->handleCommand(EIR_ViewCommand_DEACTIVATE, EIR_ViewCommandReason_Back);

        iViewStack.pop();

    }

    //step 3 : we back to the view or the view is not in view stack. Activate it.

    if (!iViewStack.isEmpty())

    {

        topView = iViewStack.pop();

        Q_ASSERT(topView->id() == aViewId);   

        switchToNextView(topView);

    }

    else

    {

        //backToView(id) is called when view is in stack, it's impossible to get here

        Q_ASSERT(false);

    }

}

void IRViewManager::switchToNextView(IRBaseView *aView)

{

    aView->handleCommand(EIR_ViewCommand_TOBEACTIVATED, EIR_ViewCommandReason_Show);

    IRBaseView *viewToHide = static_cast<IRBaseView*>(currentView());

    if( viewToHide )

    {

        if( (EIRView_StationDetailsView == aView->id() && EIRView_PlayingView == viewToHide->id())

          ||(EIRView_StationDetailsView == viewToHide->id() && EIRView_PlayingView == aView->id())

          )

        {

            setCurrentView(aView,true,Hb::ViewSwitchUseAltEvent); 

        }

        else

        {

            setCurrentView(aView,true,Hb::ViewSwitchUseNormalAnim);

        }        

    }

    else

    {

        setCurrentView(aView,true,Hb::ViewSwitchUseNormalAnim);

    }        

}

/*

 * Description : return the current view's id.

 * Return      : current view's id. 

 */

TIRViewId IRViewManager::currentViewId() const

{

    IRBaseView *topView = static_cast<IRBaseView*>(currentView());

    if (topView)

    {

        return topView->id();

    }

    return EIRView_InvalidId;

}

/*

 * Description : push a view into the view stack by id *               

 * Parameters  : aEvent : see the definition of TIRSystemEventType

 * Return      : void :  there is no return value for the function

 *                

 */

void IRViewManager::pushViewById(TIRViewId aViewId)

{

    if (isViewInStack(aViewId))

    {     

        return;

    }

    IRBaseView *curView = getView(aViewId, true);

    Q_ASSERT(curView);

    iViewStack.push(curView);

}

//                                     slot functions

/*

 * Description : slot function for softkey action.

 *               Bring user to a previous view. If view stack is empty, quit application.

 */

void IRViewManager::backToPreviousView()

{

    if(iViewStack.isEmpty())

    {

        return;

    }

    IRBaseView *topView = static_cast<IRBaseView*>(currentView());

    IRBaseView *viewToShow = iViewStack.pop();

    if(viewToShow)

    {

        if(topView)

        {

            topView->handleCommand(EIR_ViewCommand_DEACTIVATE, EIR_ViewCommandReason_Back);

        }

        switchToNextView(viewToShow);       

    }

}

void IRViewManager::handleViewReady()

{    

    IRBaseView *topView = static_cast<IRBaseView*>(currentView());

    if (topView)

    {

        topView->handleCommand(EIR_ViewCommand_ACTIVATED, EIR_ViewCommandReason_Show); 

    }

    updateSoftkey();

}

/*

 * this function is needed because signal viewReady() has a bug. will be deleted once the bug is fixed

 */

void IRViewManager::handleCurrentViewChanged(HbView * /*aView*/)

{

    updateSoftkey();

}

/*

 * Description : create a view specified by aViewId. A view is created only when it's 

 *               first time requested

 * Parameters  : aApplication : pointer to ir application object

 *               aViewId      : the view's id

 * Return      : pointer to the created view

 */

IRBaseView* IRViewManager::createView(IRApplication* aApplication, TIRViewId aViewId)

{

    switch (aViewId)

    {

        case EIRView_MainView:

            return new IRMainView(aApplication, aViewId);

        case EIRView_CategoryView:

            return new IRCategoryView(aApplication, aViewId);

        case EIRView_StationsView: