Ajoutez des fichiers projet.

Intendant/Intendant.Shared/Services/OpenAiResponsesService.cs

@@ -0,0 +1,77 @@
+#pragma warning disable OPENAI001
+using OpenAI.Responses;
+using System.ClientModel;
+
+namespace Intendant.Shared.Services;
+
+public sealed class OpenAiResponsesService : IOpenAiResponsesService
+{
+    private readonly IOpenAiSettingsService _settingsService;
+
+    public OpenAiResponsesService(IOpenAiSettingsService settingsService)
+    {
+        _settingsService = settingsService;
+    }
+
+    public async Task<string> GenerateTextAsync(string prompt, CancellationToken cancellationToken = default)
+    {
+        if (string.IsNullOrWhiteSpace(prompt))
+        {
+            throw new ArgumentException("Le prompt ne peut pas être vide.", nameof(prompt));
+        }
+
+        OpenAiResponsesOptions settings = await _settingsService.GetAsync(cancellationToken);
+
+        string apiKey = settings.ApiKey?.Trim() ?? string.Empty;
+        if (string.IsNullOrWhiteSpace(apiKey))
+        {
+            throw new InvalidOperationException("La clé API OpenAI est requise pour appeler la Responses API.");
+        }
+
+        string model = string.IsNullOrWhiteSpace(settings.Model)
+            ? "gpt-5-mini"
+            : settings.Model;
+
+        ResponsesClient client = CreateClient(apiKey, settings.Endpoint);
+
+        CreateResponseOptions options = new()
+        {
+            Model = model,
+        };
+
+        options.InputItems.Add(ResponseItem.CreateUserMessageItem(prompt));
+
+        ResponseResult response = await client.CreateResponseAsync(options, cancellationToken);
+
+        string text = string.Join(
+            Environment.NewLine,
+            response.OutputItems
+                .OfType<MessageResponseItem>()
+                .SelectMany(message => message.Content)
+                .Select(content => content.Text)
+                .Where(value => !string.IsNullOrWhiteSpace(value)));
+
+        return text;
+    }
+
+    private static ResponsesClient CreateClient(string apiKey, string endpoint)
+    {
+        if (string.IsNullOrWhiteSpace(endpoint))
+        {
+            return new ResponsesClient(apiKey);
+        }
+
+        if (!Uri.TryCreate(endpoint, UriKind.Absolute, out Uri? endpointUri))
+        {
+            throw new InvalidOperationException("L'endpoint OpenAI configuré est invalide.");
+        }
+
+        ResponsesClientOptions clientOptions = new()
+        {
+            Endpoint = endpointUri,
+        };
+
+        return new ResponsesClient(new ApiKeyCredential(apiKey), clientOptions);
+    }
+}
+#pragma warning restore OPENAI001