namespace SongTidy.Tests.TestUtilities;

/// <summary>
/// Creates a unique temporary directory per test instance and removes it on disposal.
/// </summary>
public sealed class TempDirectory : IDisposable {
    /// <summary>
    /// Gets the unique directory path managed by this instance.
    /// </summary>
    public string FullPath { get; }

    /// <summary>
    /// Creates a unique temporary directory.
    /// </summary>
    public TempDirectory() {
        FullPath = Path.Combine(Path.GetTempPath(), "songtidy-tests-" + Guid.NewGuid().ToString("N"));
        Directory.CreateDirectory(FullPath);
    }

    /// <summary>
    /// Deletes the directory tree, retrying once after a short delay.
    /// </summary>
    public void Dispose() {
        try {
            // SAFETY: Recursive deletion is confined to the GUID-named directory
            // created by this instance under the OS temp folder.
            Directory.Delete(FullPath, recursive: true);
        } catch (IOException) {
            // A file handle may still be closing; retry once before giving up.
            Thread.Sleep(100);

            try {
                // SAFETY: The retry targets the same instance-owned temp directory.
                Directory.Delete(FullPath, recursive: true);
            } catch (IOException) {
                // Leftovers in the OS temp folder are harmless; never fail a test over cleanup.
            }
        }
    }
}