namespace Zcbot.WindowsNode.Tests;

public sealed class PersistenceSafetyTests : IDisposable
{
    private readonly string root = Path.Combine(
        Path.GetTempPath(), "zcbot-persistence-tests", Guid.NewGuid().ToString("N"));

    [Fact]
    public void PathGuardAcceptsAChildAndRejectsTraversalOrRootedSegments()
    {
        var child = PathGuard.CombineUnderRoot(root, "jobs", "job-id", "state.json");

        Assert.StartsWith(Path.GetFullPath(root), child, StringComparison.OrdinalIgnoreCase);
        Assert.Throws<InvalidDataException>(
            () => PathGuard.CombineUnderRoot(root, "..", "outside.json"));
        Assert.Throws<InvalidDataException>(
            () => PathGuard.CombineUnderRoot(root, Path.GetPathRoot(root)!));
    }

    [Fact]
    public void AtomicFileReplacesTheTargetAndLeavesNoTemporaryFile()
    {
        var path = Path.Combine(root, "jobs", "state.json");

        AtomicFile.Write(path, [1, 2, 3], overwrite: false);
        AtomicFile.Write(path, [4, 5], overwrite: true);

        Assert.Equal([4, 5], File.ReadAllBytes(path));
        Assert.Empty(Directory.EnumerateFiles(
            Path.GetDirectoryName(path)!, "state.json.tmp-*"));
    }

    public void Dispose()
    {
        if (Directory.Exists(root))
        {
            Directory.Delete(root, recursive: true);
        }
    }
}