/*

* Copyright (c) 2007-2007 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:  This Class provides the core functionality to thumbnail generation 

*               

*

*/

#include<e32cmn.h>

#include<f32file.h>

#include<thumbnailmanager.h>

#include"mgthumbnailgeneration.h"

#include"mgmresolution.h"

#include"mgthumbobserver.h"

_LIT(KImage,"image");

_LIT(KVideo,"video");

_LIT(KThumbFolder,"_PAlbTN_");

const TInt KHeight = 74 ;

const TInt KWidth = 104;

const TInt KThumbnailPathMaxLen = 255;

const TInt KBufLen = 20;

const TInt KZero = 0;

// -----------------------------------------------------------------------------

// CThumbnailGeneration::NewL

// Returns the instance of CThumbnailGeneration class.

// -----------------------------------------------------------------------------

 CThumbnailGeneration* CThumbnailGeneration::NewL()

    {

    CThumbnailGeneration* self = new(ELeave)CThumbnailGeneration();

    CleanupStack::PushL(self);

    self->ConstructL();

    CleanupStack::Pop(self);

     return self;

    }

 // -----------------------------------------------------------------------------

 // CThumbnailGeneration::ConstructL

 // It creates the instance of TNM and Observer

 // -----------------------------------------------------------------------------

void  CThumbnailGeneration::ConstructL()

     {

      // Creating instance of observer class

     iThumbnailObserver = CThumbnailObserver::NewL();

     //Creating instance of ThumbnailManger 

     iThumbnailManager = CThumbnailManager::NewL(*iThumbnailObserver);  

     iThumbnailObserver->SetThumbnailMangager(iThumbnailManager);

      }

// -----------------------------------------------------------------------------

// CThumbnailGeneration::~CThumbnailGeneration

// Destructor

// -----------------------------------------------------------------------------

CThumbnailGeneration::~CThumbnailGeneration()

    {

    if(iThumbnailObserver)

        {

        delete iThumbnailObserver;

        }

    if(iThumbnailManager)

        {

        delete iThumbnailManager;

        }

    }

// -----------------------------------------------------------------------------

 // CThumbnailGeneration::CThumbnailGeneration

 // C++ Constructor 

 // -----------------------------------------------------------------------------

 CThumbnailGeneration::CThumbnailGeneration():iThumbnailObserver(NULL),iThumbnailManager(NULL)

    {

    }

 // -----------------------------------------------------------------------------

  // CThumbnailGeneration::Cancel

  // Cancels the thumbnail generation request

  // -----------------------------------------------------------------------------

 TInt CThumbnailGeneration::Cancel(TInt32 aTransactionId)

     {

     return iThumbnailObserver->Cancel(aTransactionId);

     }

 // -----------------------------------------------------------------------------

 // CThumbnailGeneration::GetThumbnailL

 // This method makes request for thumbnail generation

 // -----------------------------------------------------------------------------

 void CThumbnailGeneration::GetThumbnailL(MThumbnailObserver* aObserver,TInt32 aTransactionID, TDesC& aUrl, TInt aHeight, TInt aWidth)

    {

     // Check whether uri is valid

     TBuf<KThumbnailPathMaxLen> thumbnailpath;

     TBuf<KThumbnailPathMaxLen> refDir;

     // Checking validity of media file name

     IsUrlValidL( aUrl);

     // getting thumbnail size

     TSize thumbsize = GetthumbsizeL(aUrl,aHeight,aWidth);

     //creating thumbnail path

     CreateThumbnailPathL(aUrl,thumbsize,refDir,thumbnailpath);

     // If thumbnail already exists then give a call to users callback 

     if(IsThumbnailExistL(thumbnailpath,refDir))

         {

         iThumbnailObserver->AddToObserverL(aObserver,aTransactionID,thumbnailpath,KZero);

         iThumbnailObserver->ThumbnailAlreadyExists();

         return ;

         }

        iThumbnailManager->SetFlagsL(CThumbnailManager::ECropToAspectRatio);

        // Setting thumbnail size

        iThumbnailManager->SetThumbnailSizeL( thumbsize );

        // Prefer thumbnails in the highest quality possible disregarding

        // any negative impact on performance.

        iThumbnailManager->SetQualityPreferenceL(CThumbnailManager::EOptimizeForQuality );

        //setting display mode EColor16M for both video and image it works

        iThumbnailManager->SetDisplayModeL( EColor16M  );

        // Create an object source representing a path to a file on local

        // file system.

        CThumbnailObjectSource*  source = CThumbnailObjectSource::NewLC(aUrl,KNullDesC); 

        // Issue the request using default priority

        TInt thumbnailRequestId = iThumbnailManager->GetThumbnailL( *source );

        CleanupStack::PopAndDestroy(source);

        // Adding thumbanilrequestinfo to observer

        iThumbnailObserver->AddToObserverL(aObserver,aTransactionID,thumbnailpath,thumbnailRequestId);

     }

 // -----------------------------------------------------------------------------

 // CThumbnailGeneration::getthumbsizeL

 // This method gets the size for thumbnail 

 // -----------------------------------------------------------------------------

  TSize CThumbnailGeneration::GetthumbsizeL(TDesC& aUrl,TInt aHeight, TInt aWidth)

      {

      // Creating media resolution object 

      TSize mediaRes(0,0);

      TSize thumbsize(0,0);

      MResolution* mediaResObj= GetResolutionobjL(aUrl);

      CleanupStack::PushL(mediaResObj);

      // Getting resolution for media file

      mediaResObj->GetresolutionL(mediaRes);

      // calculating size for thumbnail

      thumbsize = CalculateSize(mediaRes,aHeight,aWidth);

      CleanupStack::Pop(mediaResObj);

      delete mediaResObj;

      return thumbsize;

      }

  // -----------------------------------------------------------------------------

  // CThumbnailGeneration::CalculateSize

  // This method calculates the size for thumbnail 

  // -----------------------------------------------------------------------------

  TSize CThumbnailGeneration::CalculateSize(TSize aRes, TInt aHeight, TInt aWidth)

       {

       TSize thumbnailsize;

       if(KNegVal == aHeight && KNegVal == aWidth ) 

	       {

	       	if( (aRes.iWidth < KWidth)  || (aRes.iHeight< KHeight) ) // if the resolution of media file is less than that of plaformspecific

		       	{

		        thumbnailsize.iWidth = aRes.iWidth; 

		        thumbnailsize.iHeight =aRes.iHeight;	       		

		       	}

	       	else // if resolution of video file is greater that platform specific

		       	{

		        thumbnailsize.iWidth = KWidth; 

		        thumbnailsize.iHeight = KHeight;

		       	}

					return thumbnailsize;

	      	}

       if(TSize(0,0) == aRes )

           {

           // If both height and width are not given or either of them are having value than that of platformspecific resolution

           // then we will use platform specific size

           if( (aHeight >KZero && (aHeight>KHeight) ) || (aWidth >KZero && (aWidth >KWidth ))  )

               {

               thumbnailsize.iWidth = KWidth; 

               thumbnailsize.iHeight = KHeight;

               }

           else if(KNegVal == aWidth ) // if height is given and width not given

               {

                thumbnailsize.iWidth = (TInt)((TReal)(KWidth/KHeight)* aHeight);

                thumbnailsize.iHeight = aHeight ;

                }

           else if(KNegVal == aHeight)// if width is given and height not given

               {

               thumbnailsize.iHeight = (TInt)(((TReal)KHeight/KWidth ) * aWidth) ;

               thumbnailsize.iWidth = aWidth ;

               }

           else // when both are given 

               {

               thumbnailsize.iWidth = aWidth; 

               thumbnailsize.iHeight = aHeight;

               }

           }

       else // When we get the resolution of media file

           {

           // If both height and width are not given or either of them are having value greater than that of media file 

            // then we will use platform specific size

            if( (aHeight >KZero && (aHeight > aRes.iHeight) ) || (aWidth >KZero && (aWidth > aRes.iWidth ))  )

                {

                thumbnailsize.iWidth = aRes.iWidth ;

                thumbnailsize.iHeight = aRes.iHeight ;

                }

            else if(KNegVal == aWidth )// if height is given and width is not given

                {

                 thumbnailsize.iWidth = (TInt)((TReal)(aRes.iWidth/aRes.iHeight)* aHeight);

                 thumbnailsize.iHeight = aHeight ;

                 }

            else if(KNegVal == aHeight)// if width is given and height not given

                {

                thumbnailsize.iHeight = (TInt)(((TReal)aRes.iHeight/aRes.iWidth ) * aWidth) ;

                thumbnailsize.iWidth = aWidth ;

                }

            else // when both are given 

                {

                thumbnailsize.iWidth = aWidth; 

                 thumbnailsize.iHeight = aHeight;               

                }

           }

       return thumbnailsize;

       }

// -----------------------------------------------------------------------------

// CThumbnailGeneration::GetResolutionobj

// This method gets the MResolution object 

// -----------------------------------------------------------------------------

 MResolution* CThumbnailGeneration::GetResolutionobjL(TDesC& aUrl)

        {

        RFs fs;

        TBuf8<KThumbnailPathMaxLen> filebuf;

        TInt fileSize = KThumbnailPathMaxLen;

        User::LeaveIfError(fs.Connect());

        CleanupClosePushL(fs);

        User::LeaveIfError(fs.ReadFileSection(aUrl,KZero,filebuf,fileSize));

        // Opening RApaLsSession to get mimetype of media file

        RApaLsSession aPaSession;

        User::LeaveIfError(aPaSession.Connect());

        CleanupClosePushL(aPaSession);

        TDataRecognitionResult mimeTypeResult;

        TBuf<KBufLen> media;

        if(KErrNone == aPaSession.RecognizeData(aUrl,filebuf,*&mimeTypeResult))

            {

            // If media type is of image then creating image resolution object

            if(KZero == mimeTypeResult.iDataType.Des().Find(KImage) )

                {

                media.Append(KImage);

                }

            else if(KZero == mimeTypeResult.iDataType.Des().Find(KVideo))

                {

                 media.Append(KVideo);

                }

            else

                {

                User::Leave(KErrNotSupported);

                }

            }

        else

            {

            // Need to leave from here

            User::Leave(KErrNotSupported);

            }

        CleanupStack::PopAndDestroy(&aPaSession); // aPaSession

        CleanupStack::PopAndDestroy(&fs);  // fs

        return MediaResolutionFactory::CreateMediaResolutionobjL(media,aUrl);

        }

// -----------------------------------------------------------------------------

// CThumbnailGeneration::IsThumbnailExist

// This method checks if the requested thumbnail already exists 

// -----------------------------------------------------------------------------

TBool CThumbnailGeneration::IsThumbnailExistL(const TDesC& aThumbpath,const TDesC& aRefDir)

    {

    // Need to check whether thumbnail exists .

    RFs fs;

    User::LeaveIfError(fs.Connect());

    CleanupClosePushL(fs);

    RFile file;

    if(KErrNone == file.Open(fs,aThumbpath,EFileRead))

        {

        // thumbnail exist so return ETrue

        file.Close();

        CleanupStack::PopAndDestroy(&fs);

        return ETrue;

        }

    // Need to check whether dir panltn exist

    TInt ret = fs.MkDirAll(aRefDir);

    if( !(KErrNone == ret || KErrAlreadyExists == ret)  )

        {

        User::Leave(ret);

        }

    CleanupStack::PopAndDestroy(&fs);

    return EFalse;

    }

// -----------------------------------------------------------------------------

// CThumbnailGeneration::IsUrlValid

// This method checks the validity of Url

// -----------------------------------------------------------------------------

void   CThumbnailGeneration::IsUrlValidL(TDesC& aUrl)

    {

     RFs fs;

     User::LeaveIfError(fs.Connect());

     // If the url is not in correct filepath format

     if(!fs.IsValidName(aUrl))

         {

         fs.Close();

         User::Leave(KErrBadName);

         }

     // If file is not present

     RFile file;

     if(KErrNone != file.Open(fs,aUrl,EFileRead))

         {

         file.Close();

         fs.Close();

         User::Leave(KErrNotFound);

         }

     file.Close();

     fs.Close();

      }

// -----------------------------------------------------------------------------

// CThumbnailGeneration::createThumbnailPath

// This method creates the thumbnail path 

// -----------------------------------------------------------------------------

void CThumbnailGeneration::CreateThumbnailPathL(TDesC& aUri, TSize aThumbsize,TDes& aRefDir ,TDes& aThumbnailPath)

    {

    TInt strlength = aUri.Length();

    TChar chr('\\'); 

   TInt len = aUri.LocateReverseF(chr);

   if(KErrNotFound == len)

       {

       User::Leave(KErrBadName);

       }

   TBuf<KThumbnailPathMaxLen> refpathbuf;

   TBuf<KThumbnailPathMaxLen> buf;

   buf.Append(aUri.Left(len+1));

   buf.Append(KThumbFolder);

   refpathbuf.Append(buf);

   refpathbuf.Append(_L("\\"));

   aRefDir.Append(refpathbuf);  // setting refdir argument

   buf.Append(aUri.Right(strlength-len));

   buf.Append('_');

   buf.AppendNum(aThumbsize.iWidth);

   buf.Append('x');

   buf.AppendNum(aThumbsize.iHeight);

   aThumbnailPath.Append(buf);

   return;

    }