Enhance logging and improve vocabulary trainer functionality in VocabLessonView

- Added detailed console logging to track the flow of the vocabulary trainer, including checks for available vocabulary and question generation.
- Implemented a safeguard against infinite loops when generating choice options by limiting attempts.
- Enhanced the buildChoiceOptions method to ensure a minimum number of options, adding generic choices if necessary.
- Improved the nextVocabQuestion method with additional logging for better debugging and user feedback.

frontend/src/views/social/VocabLessonView.vue

@@ -721,7 +721,12 @@ export default {
     },
     // Vokabeltrainer-Methoden
     startVocabTrainer() {
-      if (!this.importantVocab || this.importantVocab.length === 0) return;
+      console.log('[VocabLessonView] startVocabTrainer aufgerufen');
+      if (!this.importantVocab || this.importantVocab.length === 0) {
+        console.log('[VocabLessonView] Keine Vokabeln vorhanden');
+        return;
+      }
+      console.log('[VocabLessonView] Vokabeln gefunden:', this.importantVocab.length);
       this.vocabTrainerActive = true;
       this.vocabTrainerPool = [...this.importantVocab];
       this.vocabTrainerMode = 'multiple_choice';
@@ -729,7 +734,10 @@ export default {
       this.vocabTrainerWrong = 0;
       this.vocabTrainerTotalAttempts = 0;
       this.vocabTrainerStats = {};
-      this.nextVocabQuestion();
+      console.log('[VocabLessonView] Rufe nextVocabQuestion auf');
+      this.$nextTick(() => {
+        this.nextVocabQuestion();
+      });
     },
     stopVocabTrainer() {
       this.vocabTrainerActive = false;
@@ -764,13 +772,30 @@ export default {
     buildChoiceOptions(correctAnswer, allVocabs) {
       const options = new Set([correctAnswer]);
       // Füge 3 Distraktoren hinzu
-      while (options.size < 4 && allVocabs.length > 1) {
+      let attempts = 0;
+      const maxAttempts = 50; // Verhindere Endlosschleife
+      
+      while (options.size < 4 && allVocabs.length > 1 && attempts < maxAttempts) {
+        attempts++;
         const randomVocab = allVocabs[Math.floor(Math.random() * allVocabs.length)];
         const distractor = this.vocabTrainerDirection === 'L2R' ? randomVocab.reference : randomVocab.learning;
         if (distractor !== correctAnswer) {
           options.add(distractor);
         }
       }
+      
+      // Falls nicht genug Optionen gefunden wurden, füge generische Optionen hinzu
+      if (options.size < 4) {
+        const genericOptions = ['Option A', 'Option B', 'Option C', 'Option D'];
+        let index = 0;
+        while (options.size < 4 && index < genericOptions.length) {
+          if (!options.has(genericOptions[index])) {
+            options.add(genericOptions[index]);
+          }
+          index++;
+        }
+      }
+      
       // Shuffle
       const arr = Array.from(options);
       for (let i = arr.length - 1; i > 0; i--) {
@@ -780,7 +805,9 @@ export default {
       return arr;
     },
     nextVocabQuestion() {
+      console.log('[VocabLessonView] nextVocabQuestion aufgerufen');
       if (!this.vocabTrainerPool || this.vocabTrainerPool.length === 0) {
+        console.log('[VocabLessonView] Keine Vokabeln im Pool');
         this.currentVocabQuestion = null;
         return;
       }
@@ -799,6 +826,8 @@ export default {
         key: this.getVocabKey(vocab)
       };
       
+      console.log('[VocabLessonView] Neue Frage erstellt:', this.currentVocabQuestion.prompt);
+      
       // Reset UI
       this.vocabTrainerAnswer = '';
       this.vocabTrainerSelectedChoice = null;
@@ -806,7 +835,9 @@ export default {
       
       // Erstelle Choice-Optionen für Multiple Choice
       if (this.vocabTrainerMode === 'multiple_choice') {
+        console.log('[VocabLessonView] Erstelle Choice-Optionen...');
         this.vocabTrainerChoiceOptions = this.buildChoiceOptions(this.currentVocabQuestion.answer, this.vocabTrainerPool);
+        console.log('[VocabLessonView] Choice-Optionen erstellt:', this.vocabTrainerChoiceOptions.length);
       }
       
       // Fokussiere Eingabefeld im Typing-Modus