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// -----------------------------------------------------------------------
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// <copyright file="FileInfoExtensions.cs" company="GRNET">
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// Copyright 2011 GRNET S.A. All rights reserved.
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// 
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// Redistribution and use in source and binary forms, with or
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// without modification, are permitted provided that the following
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// conditions are met:
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// 
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//   1. Redistributions of source code must retain the above
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//      copyright notice, this list of conditions and the following
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//      disclaimer.
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// 
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//   2. Redistributions in binary form must reproduce the above
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//      copyright notice, this list of conditions and the following
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//      disclaimer in the documentation and/or other materials
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//      provided with the distribution.
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// 
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// THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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// USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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// 
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// The views and conclusions contained in the software and
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// documentation are those of the authors and should not be
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// interpreted as representing official policies, either expressed
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// or implied, of GRNET S.A.
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// </copyright>
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// -----------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.Contracts;
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using System.Linq;
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using System.Text;
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using System.IO;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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using Pithos.Network;
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namespace Pithos.Core.Agents
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{
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    static class FileInfoExtensions
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    {
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        public static int Read(this FileInfo fileInfo,byte[] buffer,int offset,int count)
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        {            
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            //Open the stream only long enough to read a block
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            using (var stream = fileInfo.OpenRead())
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            {
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                stream.Seek(offset, SeekOrigin.Begin);
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                return  stream.Read(buffer, 0, count);                
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            }
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        }
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       public static string CalculateHash(this FileSystemInfo info,int blockSize,string algorithm)
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        {
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            if (info==null)
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                throw new ArgumentNullException("info");
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            if (String.IsNullOrWhiteSpace(info.FullName))
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                throw new ArgumentException("info");
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            if (blockSize<=0)
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                throw new ArgumentOutOfRangeException("blockSize",blockSize,"blockSize must be greater than 0");
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            if (String.IsNullOrWhiteSpace(algorithm))
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                throw new ArgumentNullException("algorithm");
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            Contract.EndContractBlock();
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           //The hash for directories is an empty string
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           if (info is DirectoryInfo)
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                return String.Empty;
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           var fileInfo = (FileInfo)info;
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           if (fileInfo.Length <= blockSize)
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                return Signature.CalculateMD5(info.FullName);
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            else
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                return Signature.CalculateTreeHash(info.FullName, blockSize, algorithm).TopHash.ToHashString();
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        }
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    }
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}