/*

* Copyright (c) 2006 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:   Provides Solar Term dates for Lunar Calendar. Reads and caches

*                binary data file that lists solar term dates. 

*

*/

//debug

#include "calendarui_debug.h"

#include "CalenSolarTerms.h"

#include "CalenLunarPaths.h"

#include <f32file.h>

#include <s32file.h>

// CONSTANTS

_LIT(KSolarTermsFile, "SolarItems");

// search path for solar item file

//Uncomment for emulator

_LIT( KSolarTermsPath, "\\private\\10005901\\" );

//_LIT( KSolarTermsPath, "\\data\\" );

const TInt KFirstSolarTermYear(1900);

const TInt KLastSolarTermYear(2100);

// ======== MEMBER FUNCTIONS ========

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

// 

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

//

    {

    TRACE_ENTRY_POINT;

    CCalenSolarTerms* self = new (ELeave) CCalenSolarTerms(aFs);

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    TRACE_EXIT_POINT;

    return self;

    }

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

//

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

//

    {

    TRACE_ENTRY_POINT;

    TRACE_EXIT_POINT;

    }

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

// 

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

//

    {

    TRACE_ENTRY_POINT;

    ReadSolarTermsL( aDate );

    if ( HasSolarTermDataAvailable( aDate ) )

        {

        // Solar festival data is available for this date 

        for (TInt i(0); i < KSolarTermCount; i++)

            {

            TDateTime date = iSolarTermDates[i];

            if (aDate.Month() == date.Month() && aDate.Day() == date.Day())

                {

                // First item in iSolarTermNames is LiChun ("Spring begins")

                // occuring around 4.2 in western year. 

                // It is first solar term in Chinese Lunar year, but it's 

                // third term in western year.

                // 

                // iSolarTermDates list terms from beginning of western year,

                // that's why we subtract 2 and take modulo 24 here, to convert

                // order from 

                // Xiao Han (~ 6.1.), Da Han (~22.1), Li Chun (~4.2)...

                // to 

                // Li Chun (~4.2.), ..., ..., Da Han (~22.1)

                i += KSolarTermCount - 2;

                TInt foundIndex = i % KSolarTermCount;

                TRACE_EXIT_POINT;

                return foundIndex;

                }

            }

        TRACE_EXIT_POINT;

        return KErrNotFound;

        }

    else

        {

        // Solar festival data is NOT available for this date 

        TRACE_EXIT_POINT;

        return KErrNotSupported;

        }

    }

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

// ?description_if_needed

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

//

CCalenSolarTerms::CCalenSolarTerms(RFs& aFs) : iFs( aFs )

    {

    TRACE_ENTRY_POINT;

    TRACE_EXIT_POINT;

    }

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

// ?description_if_needed

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

//

void CCalenSolarTerms::ConstructL()

    {

    TRACE_ENTRY_POINT;

    TRACE_EXIT_POINT;

    }

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

// ?description_if_needed

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

//

TBool CCalenSolarTerms::HasSolarTermDataAvailable(const TDateTime& aDate) const

    {

    TRACE_ENTRY_POINT;

    // Note: day parameter for TDateTime starts from 0, not from 1

    const TDateTime KMinAvailable( KFirstSolarTermYear, EJanuary, 0, 0, 0, 0, 0 );

    const TDateTime KMaxAvailable( KLastSolarTermYear, EDecember, 31 - 1, 23, 59, 59, 0 );

    TRACE_EXIT_POINT;

    return TTime(KMinAvailable) <= TTime(aDate) &&

           TTime(aDate) <= TTime(KMaxAvailable);

    }

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

// Reads and caches 24 solar term dates for one year

// from "SolarItems" file

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

//

void CCalenSolarTerms::ReadSolarTermsL(TDateTime aDate)

    {

    TRACE_ENTRY_POINT;

    // Caches one year of solar items

    if ( ! HasSolarTermDataAvailable( aDate ) )

        {

        return;

        }

    TInt year = aDate.Year();

    if (iCachedYear != year)

        {

        RFile file;

        User::LeaveIfError(ffile.FindByDir(KSolarTermsFile, KSolarTermsPath));

       // User::LeaveIfError(ffile.FindByPath(KSolarTermsFile, KSolarTermsPath));

                                     ffile.File(), EFileRead));

        CleanupClosePushL(file);

        TInt seekPos = 

            (year - KFirstSolarTermYear) * sizeof(TUint8) * KSolarTermCount;

        RFileReadStream readStream( file, seekPos );

        readStream.PushL();

         for (TInt i(0); i < KSolarTermCount; i++)

             {

             TMonth month = static_cast<TMonth>( EJanuary + (i / 2) );

             TInt day = readStream.ReadUint8L();

             TDateTime dt(year, month, day-1, 0, 0, 0, 0);

             iSolarTermDates[i] = dt;

             }

        CleanupStack::PopAndDestroy(2); // readStream, file

        iCachedYear = year;

        }

    TRACE_EXIT_POINT;

    }