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Intendant/Intendant.Web/Services/OpenAiSettingsService.cs

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+using System.Text.Json;
+using Intendant.Shared.Services;
+
+namespace Intendant.Web.Services;
+
+public sealed class OpenAiSettingsService : IOpenAiSettingsService
+{
+    private readonly SemaphoreSlim _lock = new(1, 1);
+    private readonly OpenAiResponsesOptions _defaults;
+    private readonly string _filePath;
+    private OpenAiResponsesOptions? _cache;
+
+    public OpenAiSettingsService(IConfiguration configuration, IWebHostEnvironment environment)
+    {
+        _defaults = configuration.GetSection(OpenAiResponsesOptions.SectionName).Get<OpenAiResponsesOptions>() ?? new OpenAiResponsesOptions();
+
+        string directoryPath = Path.Combine(environment.ContentRootPath, "App_Data");
+        _filePath = Path.Combine(directoryPath, "openai-settings.json");
+    }
+
+    public async Task<OpenAiResponsesOptions> GetAsync(CancellationToken cancellationToken = default)
+    {
+        await _lock.WaitAsync(cancellationToken);
+        try
+        {
+            if (_cache is not null)
+            {
+                return Clone(_cache);
+            }
+
+            if (!File.Exists(_filePath))
+            {
+                _cache = Clone(_defaults);
+                return Clone(_cache);
+            }
+
+            await using FileStream stream = File.OpenRead(_filePath);
+            OpenAiResponsesOptions? stored = await JsonSerializer.DeserializeAsync<OpenAiResponsesOptions>(stream, cancellationToken: cancellationToken);
+            _cache = Normalize(stored ?? new OpenAiResponsesOptions());
+
+            return Clone(_cache);
+        }
+        finally
+        {
+            _lock.Release();
+        }
+    }
+
+    public async Task SaveAsync(OpenAiResponsesOptions options, CancellationToken cancellationToken = default)
+    {
+        OpenAiResponsesOptions normalized = Normalize(options);
+
+        await _lock.WaitAsync(cancellationToken);
+        try
+        {
+            string? directory = Path.GetDirectoryName(_filePath);
+            if (!string.IsNullOrWhiteSpace(directory))
+            {
+                Directory.CreateDirectory(directory);
+            }
+
+            await using FileStream stream = File.Create(_filePath);
+            await JsonSerializer.SerializeAsync(stream, normalized, cancellationToken: cancellationToken);
+            _cache = Clone(normalized);
+        }
+        finally
+        {
+            _lock.Release();
+        }
+    }
+
+    private OpenAiResponsesOptions Normalize(OpenAiResponsesOptions options)
+    {
+        return new OpenAiResponsesOptions
+        {
+            ApiKey = options.ApiKey?.Trim() ?? string.Empty,
+            Endpoint = options.Endpoint?.Trim() ?? string.Empty,
+            Model = string.IsNullOrWhiteSpace(options.Model) ? _defaults.Model : options.Model.Trim(),
+        };
+    }
+
+    private static OpenAiResponsesOptions Clone(OpenAiResponsesOptions source)
+    {
+        return new OpenAiResponsesOptions
+        {
+            ApiKey = source.ApiKey,
+            Endpoint = source.Endpoint,
+            Model = source.Model,
+        };
+    }
+}