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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
namespace AggregateConfigBuildTask.Tests.Unit
{
internal sealed class VirtualFileSystem(bool isWindowsMode = true) : IFileSystem
{
private readonly bool isWindowsMode = isWindowsMode;
private readonly ConcurrentDictionary<string, string> fileSystem = new(
isWindowsMode ? StringComparer.OrdinalIgnoreCase : StringComparer.Ordinal);
private RegexOptions RegexOptions => isWindowsMode ? RegexOptions.IgnoreCase : RegexOptions.None;
private StringComparison StringComparison => isWindowsMode ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal;
private string EnvironmentLineBreak => isWindowsMode ? "\r\n" : "\n";
/// <inheritdoc/>
public string[] GetFiles(string path, string searchPattern)
{
path = NormalizePath(path);
var files = new List<string>();
string regexPattern = ConvertPatternToRegex(searchPattern);
foreach (var file in fileSystem.Keys)
{
// Ensure the file starts with the given path
if (file.StartsWith(path, StringComparison))
{
// Perform a regex match using the translated pattern with timeout
if (Regex.IsMatch(file, regexPattern, RegexOptions, TimeSpan.FromMilliseconds(500)))
{
files.Add(file);
}
}
}
return [.. files];
}
/// <inheritdoc/>
public string[] ReadAllLines(string path)
{
path = NormalizePath(path);
var content = ReadAllText(path);
return content.Split(EnvironmentLineBreak);
}
/// <inheritdoc/>
public string ReadAllText(string path)
{
path = NormalizePath(path);
if (fileSystem.TryGetValue(path, out var content))
{
return content;
}
throw new FileNotFoundException($"The file '{path}' was not found in the virtual file system.");
}
/// <inheritdoc/>
public void WriteAllText(string path, string text)
{
path = NormalizePath(path);
string directoryPath = Path.GetDirectoryName(path);
if (!DirectoryExists(directoryPath))
{
throw new IOException($"Directory not found '{directoryPath}'.");
}
// As a part of the testing, we want to ensure we only write once to each file.
if (FileExists(path))
{
throw new IOException($"Tried to write to existing file '{path}'!");
}
fileSystem[path] = text;
}
/// <inheritdoc/>
public bool FileExists(string path)
{
path = NormalizePath(path);
foreach (var file in fileSystem.Keys)
{
// Ensure the file starts with the given path
if (file.Equals(path, StringComparison))
{
return true;
}
}
return false;
}
/// <inheritdoc/>
public bool DirectoryExists(string directoryPath)
{
directoryPath = NormalizePath(directoryPath);
directoryPath = EnsureTrailingDirectorySeparator(directoryPath);
foreach (var file in fileSystem.Keys)
{
if (file.Equals(directoryPath, StringComparison))
{
return true;
}
}
return false;
}
/// <inheritdoc/>
public void CreateDirectory(string directoryPath)
{
directoryPath = NormalizePath(directoryPath);
directoryPath = EnsureTrailingDirectorySeparator(directoryPath);
fileSystem[directoryPath] = string.Empty;
}
/// <inheritdoc />
public TextReader OpenText(string path)
{
return new StringReader(ReadAllText(path));
}
/// <inheritdoc />
public Stream OpenRead(string inputPath)
{
var byteArray = Encoding.UTF8.GetBytes(ReadAllText(inputPath));
return new MemoryStream(byteArray);
}
/// <summary>
/// Ensures that the provided directory path ends with a directory separator character.
/// </summary>
/// <param name="directoryPath">The directory path to normalize.</param>
private string EnsureTrailingDirectorySeparator(string directoryPath)
{
if (string.IsNullOrEmpty(directoryPath))
{
return directoryPath;
}
char directorySeparator = isWindowsMode ? '\\' : '/';
// Ensure the directory path ends with the correct directory separator
if (!directoryPath.EndsWith(directorySeparator.ToString(), StringComparison.Ordinal))
{
directoryPath += directorySeparator;
}
return directoryPath;
}
/// <summary>
/// Converts a file search pattern (with * and ?) to a regex pattern.
/// </summary>
/// <param name="searchPattern">The wild card path expression to convert to a regex pattern.</param>
private static string ConvertPatternToRegex(string searchPattern)
{
// Escape special regex characters except for * and ?
string escapedPattern = Regex.Escape(searchPattern);
// Replace escaped * and ? with their regex equivalents
escapedPattern = escapedPattern.Replace("\\*", ".*", StringComparison.Ordinal).Replace("\\?", ".", StringComparison.Ordinal);
// Add start and end anchors to ensure full-string match
return "^" + escapedPattern + "$";
}
/// <summary>
/// Normalizes file paths by replacing slashes with the correct directory separator for the platform.
/// </summary>
/// <param name="path">The file or directory path to normalize.</param>
/// <returns>A normalized path string.</returns>
private string NormalizePath(string path)
{
if (string.IsNullOrEmpty(path)) return path;
char directorySeparator = isWindowsMode ? '\\' : '/';
char alternativeSeparator = isWindowsMode ? '/' : '\\';
// Normalize slashes to the correct directory separator
string normalizedPath = path.Replace(alternativeSeparator, directorySeparator);
// Trim any redundant trailing slashes except for root directory ("/" or "C:\\")
if (normalizedPath.Length > 1 && normalizedPath.EndsWith(directorySeparator.ToString(), StringComparison.Ordinal))
{
normalizedPath = normalizedPath.TrimEnd(directorySeparator);
}
return normalizedPath;
}
}
}
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