First successfull build

EnvelopeGenerator.ReceiverUI/EnvelopeGenerator.ReceiverUI.Client/Services/Base/ApiServiceBase.cs

@@ -1,6 +1,110 @@
-namespace EnvelopeGenerator.ReceiverUI.Client.Services.Base
+using System.Net.Http.Json;
+using Microsoft.Extensions.Logging;
+
+namespace EnvelopeGenerator.ReceiverUI.Client.Services.Base;
+
+/// <summary>
+/// Basisklasse für ALLE API-Services.
+/// 
+/// WARUM eine Basisklasse?
+/// - Einheitliches Error-Handling: Jeder API-Aufruf wird gleich behandelt
+/// - DRY (Don't Repeat Yourself): Logging, Fehlerbehandlung, Serialisierung nur einmal
+/// - Einfache Erweiterung: Retry-Logik, Token-Refresh etc. nur hier ändern
+/// </summary>
+public abstract class ApiServiceBase
 {
-    public class ApiServiceBase
+    protected readonly HttpClient Http;
+    protected readonly ILogger Logger;
+
+    protected ApiServiceBase(HttpClient http, ILogger logger)
     {
+        Http = http;
+        Logger = logger;
     }
-}
+
+    /// <summary>
+    /// GET-Request mit Deserialisierung.
+    /// Alle API GET-Aufrufe gehen durch diese Methode.
+    /// </summary>
+    protected async Task<ApiResponse<T>> GetAsync<T>(string endpoint, CancellationToken ct = default)
+    {
+        try
+        {
+            var response = await Http.GetAsync(endpoint, ct);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                var errorBody = await response.Content.ReadAsStringAsync(ct);
+                Logger.LogWarning("GET {Endpoint} failed: {Status} - {Body}",
+                    endpoint, (int)response.StatusCode, errorBody);
+                return ApiResponse<T>.Failure((int)response.StatusCode, errorBody);
+            }
+
+            var data = await response.Content.ReadFromJsonAsync<T>(cancellationToken: ct);
+            return ApiResponse<T>.Success(data!, (int)response.StatusCode);
+        }
+        catch (HttpRequestException ex)
+        {
+            Logger.LogError(ex, "HTTP error calling GET {Endpoint}", endpoint);
+            return ApiResponse<T>.Failure(0, "Verbindung zum Server fehlgeschlagen.");
+        }
+        catch (TaskCanceledException)
+        {
+            Logger.LogWarning("GET {Endpoint} was cancelled", endpoint);
+            return ApiResponse<T>.Failure(0, "Anfrage abgebrochen.");
+        }
+    }
+
+    /// <summary>
+    /// POST-Request mit Body und Response-Deserialisierung.
+    /// </summary>
+    protected async Task<ApiResponse<TResponse>> PostAsync<TRequest, TResponse>(
+        string endpoint, TRequest body, CancellationToken ct = default)
+    {
+        try
+        {
+            var response = await Http.PostAsJsonAsync(endpoint, body, ct);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                var errorBody = await response.Content.ReadAsStringAsync(ct);
+                Logger.LogWarning("POST {Endpoint} failed: {Status} - {Body}",
+                    endpoint, (int)response.StatusCode, errorBody);
+                return ApiResponse<TResponse>.Failure((int)response.StatusCode, errorBody);
+            }
+
+            var data = await response.Content.ReadFromJsonAsync<TResponse>(cancellationToken: ct);
+            return ApiResponse<TResponse>.Success(data!, (int)response.StatusCode);
+        }
+        catch (HttpRequestException ex)
+        {
+            Logger.LogError(ex, "HTTP error calling POST {Endpoint}", endpoint);
+            return ApiResponse<TResponse>.Failure(0, "Verbindung zum Server fehlgeschlagen.");
+        }
+    }
+
+    /// <summary>
+    /// POST-Request ohne Response-Body (z.B. Logout).
+    /// </summary>
+    protected async Task<ApiResponse> PostAsync<TRequest>(
+        string endpoint, TRequest body, CancellationToken ct = default)
+    {
+        try
+        {
+            var response = await Http.PostAsJsonAsync(endpoint, body, ct);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                var errorBody = await response.Content.ReadAsStringAsync(ct);
+                return ApiResponse.Failure((int)response.StatusCode, errorBody);
+            }
+
+            return ApiResponse.Success((int)response.StatusCode);
+        }
+        catch (HttpRequestException ex)
+        {
+            Logger.LogError(ex, "HTTP error calling POST {Endpoint}", endpoint);
+            return ApiResponse.Failure(0, "Verbindung zum Server fehlgeschlagen.");
+        }
+    }
+}