journal/Journal.WebGateway/Infrastructure/States.cs

using System.Text.Json;
using System.Text.Json.Serialization;

namespace Journal.WebGateway.Infrastructure;

public sealed class WebUiState(string distPath)
{
    public string DistPath { get; } = distPath;
    public bool Exists => Directory.Exists(DistPath) && File.Exists(Path.Combine(DistPath, "index.html"));
}

public sealed class SidecarRootState(string autoRoot)
{
    private readonly object _sync = new();
    private string _fallbackRoot = autoRoot;
    private string _currentRoot = autoRoot;
    private bool _isCustom;

    public (string Root, bool IsCustom) Get()
    {
        lock (_sync) return (_currentRoot, _isCustom);
    }

    public void SetResolved(string path, bool isCustom)
    {
        lock (_sync)
        {
            _currentRoot = Path.GetFullPath(path.Trim());
            _isCustom = isCustom;
            if (!isCustom)
                _fallbackRoot = _currentRoot;
        }
    }

    public void ResetToFallback()
    {
        lock (_sync)
        {
            _currentRoot = _fallbackRoot;
            _isCustom = false;
        }
    }
}

public sealed class SetSidecarRootRequest { public string? Path { get; set; } }

public sealed class CommandEnvelope
{
    public string Action { get; set; } = "";
    public string? CorrelationId { get; set; }
    public string? Id { get; set; }
    public string? Type { get; set; }
    public string? Tag { get; set; }
    public JsonElement? Payload { get; set; }
}