/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */



using System;
using System.Collections.Generic;
using System.Collections;
using System.IO;
using HH.WMS.Utils.NPOI.POIFS.Common;
using HH.WMS.Utils.NPOI.POIFS.FileSystem;
using HH.WMS.Utils.NPOI.POIFS.Storage;
using HH.WMS.Utils.NPOI.POIFS.NIO;
using HH.WMS.Utils.NPOI.Util;

namespace HH.WMS.Utils.NPOI.POIFS.Properties
{
    public class NPropertyTable : PropertyTableBase
    {
        private POIFSBigBlockSize _bigBigBlockSize;

        public NPropertyTable(HeaderBlock headerBlock) : base(headerBlock)
        {
            _bigBigBlockSize = headerBlock.BigBlockSize;
        }

        public NPropertyTable(HeaderBlock headerBlock, NPOIFSFileSystem fileSystem)
            :base(headerBlock, 
                    BuildProperties( (new NPOIFSStream(fileSystem, headerBlock.PropertyStart)).GetEnumerator(),headerBlock.BigBlockSize)
            )
        {
            _bigBigBlockSize = headerBlock.BigBlockSize;
        }

//        private static List<Property> BuildProperties(IEnumerator<byte[]> dataSource, POIFSBigBlockSize bigBlockSize)
        private static List<Property> BuildProperties(IEnumerator<ByteBuffer> dataSource, POIFSBigBlockSize bigBlockSize)
        {
            try
            {
                List<Property> properties = new List<Property>();

                while(dataSource.MoveNext())
                {
                    ByteBuffer bb = dataSource.Current;
                    //byte[] bb = (byte[])dataSource.Current;

                    // Turn it into an array
                    byte[] data;
                    if (bb.HasBuffer && bb.Offset == 0 &&
                        bb.Buffer.Length == bigBlockSize.GetBigBlockSize())
                    {
                        data = bb.Buffer;
                    }
                    else
                    {
                        data = new byte[bigBlockSize.GetBigBlockSize()];
                        //bb.get(data, 0, data.length);
                        bb.Read(data, 0, data.Length);
                    }
                    //}

                    //data = new byte[bigBlockSize.GetBigBlockSize()];
                    //System.Array.Copy(bb, data, bb.Length);

                    PropertyFactory.ConvertToProperties(data, properties);
                }
                return properties;

            }
            catch(System.IO.IOException ex)
            {
                throw ex;
            }

         
        }

        public override int CountBlocks
        {
            get
            {
                int size = _properties.Count * POIFSConstants.PROPERTY_SIZE;
                
                return (int)Math.Ceiling(1.0*size/_bigBigBlockSize.GetBigBlockSize());
            }
        }

        public void Write(NPOIFSStream stream)
        {
            try
            {
                //Leon ByteArrayOutputStream  -->MemoryStream
                MemoryStream ms = new MemoryStream();
                foreach(Property property in _properties)
                {
                    if(property != null)
                        property.WriteData(ms);
                }

                stream.UpdateContents(ms.ToArray());

                 // Update the start position if needed
              if(StartBlock != stream.GetStartBlock()) 
              {
                      StartBlock = stream.GetStartBlock();
              }
            }
            catch(System.IO.IOException ex)
            {
                throw ex;
            }
        }
    }
}