/*

* 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.Text.RegularExpressions;

using SymbianStructuresLib.Debug.Symbols;

using SymbianSymbolLib.SourceManagement.Source;

using SymbianSymbolLib.SourceManagement.Provisioning;

using SymbianUtils;

using SymbianUtils.Tracer;

using SymbianUtils.FileTypes;

using SLPluginSymbol.Source;

namespace SLPluginSymbol.Data

{

    internal class SymbolFileSegment : DisposableObject, IEnumerable<SymbolCollectionSegment>

    {

        #region Delegates & events

        public delegate void CompletionHandler( SymbolFileSegment aSegment );

        public event CompletionHandler Completed = null;

        #endregion

        #region Constructors

        public SymbolFileSegment( SymbolFileData aData, int aOffset, int aLength )

		{

            iData = aData;

            iOffset = aOffset;

            iLength = aLength;

		}

        #endregion

        #region API

        public void PerformInitialCollectionIdentification()

        {

            SymbolCollectionSegment current = null;

            //

            long lineCount = 0;

            //

            using ( StreamReader reader = NewStream() )

            {

                string line = reader.ReadLine();

                while ( line != null )

                {

                    ++lineCount;

                    if ( line.StartsWith( "From    " ) )

                    {

                        string hostFileName = line.Substring( 4 ).Trim();

                        UpdateLineCount( current );

                        current = NewCollectionSegment( hostFileName );

                    }

                    else if ( current != null && line != string.Empty )

                    {

                        current.AddLine( line );

                    }

                    line = reader.ReadLine();

                }

            }

            UpdateLineCount( current );

            iIsReady = true;

            if ( Completed != null )

            {

                Completed( this );

            }

        }

        #endregion

        #region Properties

        public bool IsReady

        {

            get { return iIsReady; }

        }

        public long NumberOfLines

        {

            get { return iNumberOfLines; }

        }

        public int Count

        {

            get { return iCollectionSegments.Count; }

        }

        public SymbolCollectionSegment this[ int aIndex ]

        {

            get { return iCollectionSegments[ aIndex ]; }

        }

        public SymbolSource Source

        {

            get { return iData.Source; }

        }

        #endregion

        #region Internal constants

        #endregion

        #region Internal methods

        private void UpdateLineCount( SymbolCollectionSegment aFinalisedSegment )

        {

            if ( aFinalisedSegment != null )

            {

                iNumberOfLines += aFinalisedSegment.Count;

            }

        }

        private SymbolCollectionSegment NewCollectionSegment( string aFileNameInHost )

        {

            SymbolCollectionSegment ret = new SymbolCollectionSegment( iData.Source.Provider.IdAllocator, aFileNameInHost );

            iCollectionSegments.Add( ret );

            return ret;

        }

        private StreamReader NewStream()

        {

            return new StreamReader( new MemoryStream( iData, iOffset, iLength ) );

        }

        #endregion

        #region From IEnumerable<SymbolCollectionSegment>

        public IEnumerator<SymbolCollectionSegment> GetEnumerator()

        {

            foreach ( SymbolCollectionSegment segment in iCollectionSegments )

            {

                yield return segment;

            }

        }

        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()

        {

            foreach ( SymbolCollectionSegment segment in iCollectionSegments )

            {

                yield return segment;

            }

        }

        #endregion

        #region From DisposableObject

        protected override void CleanupManagedResources()

        {

            try

            {

                base.CleanupManagedResources();

            }

            finally

            {

                foreach ( SymbolCollectionSegment segment in iCollectionSegments )

                {

                    segment.Dispose();

                }

                iCollectionSegments.Clear();

                iCollectionSegments = null;

            }

        }

        #endregion

        #region Data members

        private readonly SymbolFileData iData;

        private readonly int iOffset;

        private readonly int iLength;

        private bool iIsReady = false;

        private long iNumberOfLines = 0;

        private List<SymbolCollectionSegment> iCollectionSegments = new List<SymbolCollectionSegment>();

        #endregion

    }

}