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// Licensed to the .NET Foundation under one or more agreements.

// The .NET Foundation licenses this file to you under the MIT license.

// See the LICENSE file in the project root for more information.

using System;

using System.IO;

namespace Cake.Testing

{

internal sealed class FakeFileStream : Stream

{

private readonly FakeFile _file;

private long _position;

public override bool CanRead => true;

public override bool CanSeek => true;

public override bool CanWrite => true;

public FakeFileStream(FakeFile file)

{

_file = file;

_position = 0;

}

public override void Flush()

{

}

public override long Length

{

get

{

lock (_file.ContentLock)

{

return _file.ContentLength;

}

}

}

public override long Position

{

get { return _position; }

set { Seek(value, SeekOrigin.Begin); }

}

public override int Read(byte[] buffer, int offset, int count)

{

lock (_file.ContentLock)

{

var end = _position + count;

var fileSize = _file.ContentLength;

var maxLengthToRead = end > fileSize ? fileSize - _position : count;

Buffer.BlockCopy(_file.Content, (int)_position, buffer, offset, (int)maxLengthToRead);

_position += maxLengthToRead;

return (int)maxLengthToRead;

}

}

public override long Seek(long offset, SeekOrigin origin)

{

if (origin == SeekOrigin.Begin)

{

return MoveTo(offset);

}

if (origin == SeekOrigin.Current)

{

return MoveTo(_position + offset);

}

if (origin == SeekOrigin.End)

{

return MoveTo(_file.ContentLength - offset);

}

throw new NotSupportedException();

}

public override void SetLength(long value)

{

lock (_file.ContentLock)

{

_file.Resize(value);

}

}

public override void Write(byte[] buffer, int offset, int count)

{

lock (_file.ContentLock)

{

var fileSize = _file.ContentLength;

var endOfWrite = _position + count;

if (endOfWrite > fileSize)

{

_file.Resize(endOfWrite);

}

Buffer.BlockCopy(buffer, offset, _file.Content, (int)_position, count);

_position = _position + count;

}

}

private long MoveTo(long offset)

{

lock (_file.ContentLock)

{

if (offset < 0)

{

throw new InvalidOperationException();

}

if (offset > _file.ContentLength)

{

_file.Resize(offset);

}

_position = offset;

return offset;

}

}

}

}