/*

* 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:

*

*/

using System;

using System.Collections.Generic;

using System.Text;

using System.IO;

using System.ComponentModel;

using SymbianUtils;

namespace SymbianUtils.FileSystem

{

    public class FSDirectoryScanner : DisposableObject

    {

        #region Delegates & events

        public delegate void OperationStarted( FSDirectoryScanner aScanner );

        public event OperationStarted Started;

        public delegate void ProgressHandler( FSDirectoryScanner aScanner, int aProgress, FileInfo aFile );

        public event ProgressHandler Progress;

        public delegate void OperationComplete( FSDirectoryScanner aScanner );

        public event OperationComplete Complete;

        #endregion

        #region Constructors

        public FSDirectoryScanner()

        {

            iWorker.ProgressChanged += new ProgressChangedEventHandler( Worker_ProgressChanged );

            iWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler( Worker_RunWorkerCompleted );

            iWorker.DoWork += new DoWorkEventHandler( Worker_DoWork );

        }

        #endregion

        #region API

        public virtual void Start( DirectoryInfo aDirectory )

        {

            iWorker.RunWorkerAsync( aDirectory );

        }

        #endregion

        #region Framework API

        protected virtual void OnFileLocated( FileInfo aFile )

        {

        }

        #endregion

        #region Worker event handlers

        private void Worker_DoWork( object aSender, DoWorkEventArgs aArgs )

        {

            if ( Started != null )

            {

                Started( this );

            }

            //

            DirectoryInfo dir = aArgs.Argument as DirectoryInfo;

            if ( dir != null && dir.Exists )

            {

                // Locate all the map files in the directory

                FileInfo[] fileInfoList = dir.GetFiles( "*.*" );

                int count = fileInfoList.Length;

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

                {

                    FileInfo file = fileInfoList[ i ];

                    //

                    ReportProgress( file, i, count );

                }

            }

        }

        private void Worker_RunWorkerCompleted( object aSender, RunWorkerCompletedEventArgs aArgs )

        {

            if ( Complete != null )

            {

                Complete( this );

            }

        }

        private void Worker_ProgressChanged( object aSender, ProgressChangedEventArgs aArgs )

        {

            if ( Progress != null )

            {

                Progress( this, aArgs.ProgressPercentage, aArgs.UserState as FileInfo );

            }

        }

        #endregion

        #region From DisposableObject

        protected override void CleanupManagedResources()

        {

            if ( iWorker != null )

            {

                iWorker.Dispose();

                iWorker = null;

            }

            base.CleanupManagedResources();

        }

        #endregion

        #region Internal methods

        protected void ReportProgress( FileInfo aFile, int aFileIndex, int aFileCount )

        {

            OnFileLocated( aFile );

            //

            int progress = (int) ( ( (float) aFileIndex / (float) aFileCount ) * 100.0f );

            iWorker.ReportProgress( progress, aFile );

        }

        #endregion

        #region Data members

        private BackgroundWorker iWorker = new BackgroundWorker();

        #endregion

    }

}