/*

* Copyright (c) 2004-2008 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: 

*

*/

using System;

using System.IO;

using System.Collections.Generic;

using System.Text;

using System.ComponentModel;

using SymbianUtils;

using SymbianUtils.Tracer;

using SymbianUtils.Threading;

using SymbianUtils.FileTypes;

using SymbianUtils.TextUtilities.Readers.Types.Array;

using SymbianStructuresLib.Debug.Symbols;

using SymbianSymbolLib.SourceManagement.Source;

using SymbianSymbolLib.SourceManagement.Provisioning;

using SLPluginSymbol.Data;

using SLPluginSymbol.Source;

namespace SLPluginSymbol.Reader

{

    internal class SymbolFileReader : MultiThreadedProcessor<SymbolFileSegment>

	{

        #region Constructors

        public SymbolFileReader( SymbolSource aSource, SymbolFileData aData )

            : base( aData, System.Threading.ThreadPriority.Lowest )

		{

            iSource = aSource;

            iData = aData;

            // Count the total number of lines - this enables us to report progress

            foreach ( SymbolFileSegment segment in iData )

            {

                iTotalNumberOfLines += segment.NumberOfLines;

            }

        }

		#endregion

        #region API

        public void Read( TSynchronicity aSynchronicity )

        {

            base.Start( aSynchronicity );

        }

        #endregion

        #region Properties

		#endregion

        #region Event handlers

        private void SymbolFileSegmentReader_Progress( SymbolFileSegmentReader aReader, long aTotalNumberOfLines, long aChunkSizeProcessed )

        {

            bool report = false;

            int progress = 0;

            //

            lock ( iSyncRoot )

            {

                iProgressSoFar += aChunkSizeProcessed;

                //

                float progressF = (float) iProgressSoFar / (float) iTotalNumberOfLines;

                progress = (int) ( progressF * 100.0f );

                //

                if ( iProgressLastReported != progress )

                {

                    iProgressLastReported = progress;

                    report = true;

                }

                //

                if ( report )

                {

                    System.Diagnostics.Debug.WriteLine( "SymbolFileReader - progress: " + progress );

                    iSource.ReportEvent( SymSource.TEvent.EReadingProgress, progress );

                }

            }

        }

        #endregion

        #region Internal methods

        #endregion

        #region From MultiThreadedProcessor

        protected override void OnEvent( MultiThreadedProcessor<SymbolFileSegment>.TEvent aEvent )

        {

            base.OnEvent( aEvent );

            //

            switch ( aEvent )

            {

            case MultiThreadedProcessor<SymbolFileSegment>.TEvent.EEventStarting:

                iSource.ReportEvent( SymSource.TEvent.EReadingStarted );

                break;

            case MultiThreadedProcessor<SymbolFileSegment>.TEvent.EEventCompleted:

                iSource.ReportEvent( SymSource.TEvent.EReadingComplete );

                this.Dispose();

                System.Diagnostics.Debug.WriteLine( string.Format( "[Symbol Memory] END   -> {0:d12}, source: {1}", System.GC.GetTotalMemory( true ), iSource.FileName ) );

                break;

            default:

                break;

            }

        }

        protected override bool Process( SymbolFileSegment aItem )

        {

            SymbolFileSegmentReader reader = new SymbolFileSegmentReader( aItem );

            reader.Progress += new SymbolFileSegmentReader.ProgressHandler( SymbolFileSegmentReader_Progress );

            reader.Read( TSynchronicity.ESynchronous );

            return true;

        }

        #endregion

        #region From DisposableObject

        protected override void CleanupManagedResources()

        {

            try

            {

                base.CleanupManagedResources();

            }

            finally

            {

                iData.Dispose();

                // Since we've just flushed a large portion of file data (symbol files are BIG)

                // ensure that disposed objects are released in order to reduce memory footprint.

                GC.Collect();

                GC.WaitForPendingFinalizers();

            }

        }

        #endregion

        #region Data members

        private readonly SymbolSource iSource;

        private readonly SymbolFileData iData;

        private readonly long iTotalNumberOfLines;

        private long iProgressSoFar = 0;

        private object iSyncRoot = new object();

        private int iProgressLastReported = -1;

        #endregion

	}

}