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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;

using Cake.Core.IO;

using Path = Cake.Core.IO.Path;

namespace Cake.Testing

{

/// <summary>

/// Represents a fake file.

/// </summary>

public sealed class FakeFile : IFile

{

private readonly FakeFileSystemTree _tree;

/// <summary>

/// Gets the path to the file.

/// </summary>

/// <value>The path.</value>

public FilePath Path { get; }

/// <summary>

/// Gets the path to the file.

/// </summary>

/// <value>The path.</value>

Path IFileSystemInfo.Path => Path;

/// <summary>

/// Gets a value indicating whether this <see cref="IFileSystemInfo" /> exists.

/// </summary>

/// <value>

/// <c>true</c> if the entry exists; otherwise, <c>false</c>.

/// </value>

public bool Exists { get; internal set; }

/// <summary>

/// Gets a value indicating whether this <see cref="IFileSystemInfo" /> is hidden.

/// </summary>

/// <value>

/// <c>true</c> if the entry is hidden; otherwise, <c>false</c>.

/// </value>

public bool Hidden { get; internal set; }

/// <summary>

/// Gets the time when this <see cref="IFileSystemInfo"/> was last written to.

/// </summary>

/// <value>The last write time.</value>

public DateTime LastWriteTime { get; internal set; }

/// <summary>

/// Gets the length of the file.

/// </summary>

/// <value>

/// The length of the file.

/// </value>

public long Length { get; private set; }

/// <summary>

/// Gets or sets the file attributes.

/// </summary>

/// <value>The file attributes.</value>

public FileAttributes Attributes { get; set; }

internal object ContentLock { get; } = new object();

/// <summary>

/// Gets the length of the content.

/// </summary>

/// <value>

/// The length of the content.

/// </value>

public long ContentLength

{

get { return Length; }

internal set { Length = value; }

}

/// <summary>

/// Gets the content.

/// </summary>

/// <value>The content.</value>

public byte[] Content { get; internal set; } = new byte[4096];

internal FakeFile(FakeFileSystemTree tree, FilePath path)

{

_tree = tree;

Path = path;

Exists = false;

Hidden = false;

}

/// <summary>

/// Copies the file to the specified destination path.

/// </summary>

/// <param name="destination">The destination path.</param>

/// <param name="overwrite">Will overwrite existing destination file if set to <c>true</c>.</param>

public void Copy(FilePath destination, bool overwrite)

{

_tree.CopyFile(this, destination, overwrite);

}

/// <summary>

/// Moves the file to the specified destination path.

/// </summary>

/// <param name="destination">The destination path.</param>

public void Move(FilePath destination)

{

_tree.MoveFile(this, destination);

}

/// <summary>

/// Opens the file using the specified options.

/// </summary>

/// <param name="fileMode">The file mode.</param>

/// <param name="fileAccess">The file access.</param>

/// <param name="fileShare">The file share.</param>

/// <returns>A <see cref="Stream" /> to the file.</returns>

public Stream Open(FileMode fileMode, FileAccess fileAccess, FileShare fileShare)

{

bool fileWasCreated;

var position = GetPosition(fileMode, out fileWasCreated);

if (fileWasCreated)

{

_tree.CreateFile(this);

}

return new FakeFileStream(this) { Position = position };

}

/// <summary>

/// Deletes the file.

/// </summary>

public void Delete()

{

_tree.DeleteFile(this);

}

/// <summary>

/// Resizes the file.

/// </summary>

/// <param name="offset">The offset.</param>

public void Resize(long offset)

{

if (Length < offset)

{

Length = offset;

}

if (Content.Length >= Length)

{

return;

}

var buffer = new byte[Length * 2];

Buffer.BlockCopy(Content, 0, buffer, 0, Content.Length);

Content = buffer;

}

private long GetPosition(FileMode fileMode, out bool fileWasCreated)

{

fileWasCreated = false;

if (Exists)

{

switch (fileMode)

{

case FileMode.CreateNew:

throw new IOException();

case FileMode.Create:

case FileMode.Truncate:

Length = 0;

return 0;

case FileMode.Open:

case FileMode.OpenOrCreate:

return 0;

case FileMode.Append:

return Length;

}

}

else

{

switch (fileMode)

{

case FileMode.Create:

case FileMode.Append:

case FileMode.CreateNew:

case FileMode.OpenOrCreate:

fileWasCreated = true;

Exists = true;

LastWriteTime = DateTime.Now;

return Length;

case FileMode.Open:

case FileMode.Truncate:

throw new FileNotFoundException();

}

}

throw new NotSupportedException();

}

}

}