HanaToolbox/Services/FileMonitorStateService.cs

using HanaToolbox.Logging;
using HanaToolbox.Services.Interfaces;

namespace HanaToolbox.Services;

/// <summary>
/// File-based alert state persistence.
/// Each key maps to /etc/hanatoolbox/state/&lt;key&gt;.state containing a plain-text value.
/// </summary>
public sealed class FileMonitorStateService(AppLogger logger) : IMonitorStateService
{
    private static readonly string StateDir = Config.ConfigService.StateDirectory;

    public string? GetState(string key)
    {
        var path = StatePath(key);
        if (!File.Exists(path)) return null;

        try { return File.ReadAllText(path).Trim(); }
        catch { return null; }
    }

    public void SetState(string key, string value)
    {
        try
        {
            Directory.CreateDirectory(StateDir);
            File.WriteAllText(StatePath(key), value);
        }
        catch (Exception ex)
        {
            logger.Warning($"Could not write state for '{key}': {ex.Message}");
        }
    }

    private static string StatePath(string key) =>
        Path.Combine(StateDir, $"{key}.state");
}