[FA-4] Adds an event bus infrastructure, a RabbitMQ implementation and rewires existing mutations on NovelService to utilize it.

FictionArchive.Service.TranslationService/Services/TranslationEngineService.cs

@@ -0,0 +1,47 @@
+using System.Text;
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Services.EventBus;
+using FictionArchive.Service.Shared.Services.EventBus.Implementations;
+using FictionArchive.Service.TranslationService.Models;
+using FictionArchive.Service.TranslationService.Models.Database;
+using FictionArchive.Service.TranslationService.Models.Enums;
+using FictionArchive.Service.TranslationService.Models.IntegrationEvents;
+using FictionArchive.Service.TranslationService.Services.Database;
+using FictionArchive.Service.TranslationService.Services.TranslationEngines;
+using RabbitMQ.Client;
+
+namespace FictionArchive.Service.TranslationService.Services;
+
+public class TranslationEngineService
+{
+    private readonly IEnumerable<ITranslationEngine> _translationEngines;
+    private readonly IEventBus _eventBus;
+    private readonly TranslationServiceDbContext _dbContext;
+
+    public TranslationEngineService(IEnumerable<ITranslationEngine> translationEngines, TranslationServiceDbContext dbContext, IEventBus eventBus)
+    {
+        _translationEngines = translationEngines;
+        _dbContext = dbContext;
+        _eventBus = eventBus;
+    }
+
+    public async Task<TranslationResult> Translate(Language from, Language to, string text, string translationEngineKey)
+    {
+        var engine = _translationEngines.FirstOrDefault(engine => engine.Descriptor.Key == translationEngineKey);
+        var translation = await engine.GetTranslation(text, from, to);
+
+        _dbContext.TranslationRequests.Add(new TranslationRequest()
+        {
+            OriginalText = text,
+            BilledCharacterCount = translation.BilledCharacterCount, // FILL ME
+            From = from,
+            To = to,
+            Status = translation != null ? TranslationRequestStatus.Success : TranslationRequestStatus.Failed,
+            TranslatedText = translation.TranslatedText,
+            TranslationEngineKey = translationEngineKey
+        });
+        await _dbContext.SaveChangesAsync();
+        
+        return translation;
+    }
+}