feat(admin): add user vocab course management functionality

- Implemented `getUserVocabCourses` and `getVocabCourseForAdmin` methods in `AdminController` to allow admins to retrieve enrolled vocab courses for users and specific course details, respectively.
- Updated `adminRouter` to include new routes for accessing user vocab courses and course details.
- Enhanced `AdminService` with methods to list user-enrolled vocab courses and retrieve course information with lessons, ensuring proper access control.
- Improved `VocabService` to support the new functionalities, including attaching language names to course data.
- Updated UI components in `UsersView` to reflect changes, including error handling and loading states for course retrieval, along with localization updates for new features.

backend/services/adminService.js

@@ -1973,6 +1973,36 @@ class AdminService {
             throw e;
         }
     }
+
+    async adminListUserEnrolledVocabCourses(requesterHashedId, targetHashedId) {
+        if (!(await this.hasUserAccess(requesterHashedId, 'useradministration'))) {
+            throw new Error('noaccess');
+        }
+        const vocab = new VocabService();
+        try {
+            return await vocab.listEnrolledVocabCoursesForUser(targetHashedId);
+        } catch (e) {
+            if (e.status === 404) {
+                throw new Error('notfound');
+            }
+            throw e;
+        }
+    }
+
+    async adminGetVocabCourseWithLessons(requesterHashedId, courseId) {
+        if (!(await this.hasUserAccess(requesterHashedId, 'useradministration'))) {
+            throw new Error('noaccess');
+        }
+        const vocab = new VocabService();
+        try {
+            return await vocab.adminGetCourseWithLessonsForStaff(Number(courseId));
+        } catch (e) {
+            if (e.status === 404) {
+                throw new Error('coursenotfound');
+            }
+            throw e;
+        }
+    }
 }
 
 export default new AdminService();

backend/services/vocabService.js

@@ -312,6 +312,44 @@ export default class VocabService {
     return user;
   }
 
+  async _attachLanguageNamesToCourseRows(coursesData) {
+    if (!coursesData.length) {
+      return;
+    }
+    const languageIds = [...new Set(coursesData.map((c) => c.languageId))];
+    if (languageIds.length > 0) {
+      const languages = await sequelize.query(
+        `SELECT id, name FROM community.vocab_language WHERE id IN (:languageIds)`,
+        {
+          replacements: { languageIds },
+          type: sequelize.QueryTypes.SELECT
+        }
+      );
+      if (Array.isArray(languages)) {
+        const languageMap = new Map(languages.map((l) => [l.id, l.name]));
+        coursesData.forEach((c) => {
+          c.languageName = languageMap.get(c.languageId) || null;
+        });
+      }
+    }
+    const nativeLanguageIds = [...new Set(coursesData.map((c) => c.nativeLanguageId).filter((id) => id !== null))];
+    if (nativeLanguageIds.length > 0) {
+      const nativeLanguages = await sequelize.query(
+        `SELECT id, name FROM community.vocab_language WHERE id IN (:nativeLanguageIds)`,
+        {
+          replacements: { nativeLanguageIds },
+          type: sequelize.QueryTypes.SELECT
+        }
+      );
+      if (Array.isArray(nativeLanguages)) {
+        const nativeLanguageMap = new Map(nativeLanguages.map((l) => [l.id, l.name]));
+        coursesData.forEach((c) => {
+          c.nativeLanguageName = c.nativeLanguageId ? nativeLanguageMap.get(c.nativeLanguageId) || null : null;
+        });
+      }
+    }
+  }
+
   async _getUserLlmConfig(userId) {
     const [settingsType, apiKeyType] = await Promise.all([
       UserParamType.findOne({ where: { description: 'llm_settings' } }),
@@ -1743,57 +1781,8 @@ export default class VocabService {
       order: [['createdAt', 'DESC']]
     });
 
-    // Debug-Logging (kann später entfernt werden)
-    console.log(`[getCourses] Gefunden: ${courses.length} Kurse`, {
-      userId: user.id,
-      languageId,
-      nativeLanguageId,
-      search,
-      whereBefore: JSON.stringify(where, null, 2),
-      includePublic: includePublicBool,
-      includeOwn: includeOwnBool,
-      andConditionsLength: andConditions.length,
-      directWherePropsBefore: Object.keys(where).filter(key => key !== Op.and && key !== Op.or),
-      whereAfter: JSON.stringify(where, null, 2)
-    });
-
     const coursesData = courses.map(c => c.get({ plain: true }));
-    
-    // Lade Sprachnamen für alle Kurse
-    const languageIds = [...new Set(coursesData.map(c => c.languageId))];
-    if (languageIds.length > 0) {
-      const languages = await sequelize.query(
-        `SELECT id, name FROM community.vocab_language WHERE id IN (:languageIds)`,
-        {
-          replacements: { languageIds },
-          type: sequelize.QueryTypes.SELECT
-        }
-      );
-      if (Array.isArray(languages)) {
-        const languageMap = new Map(languages.map(l => [l.id, l.name]));
-        coursesData.forEach(c => {
-          c.languageName = languageMap.get(c.languageId) || null;
-        });
-      }
-    }
-    
-    // Lade Muttersprachen-Namen für alle Kurse
-    const nativeLanguageIds = [...new Set(coursesData.map(c => c.nativeLanguageId).filter(id => id !== null))];
-    if (nativeLanguageIds.length > 0) {
-      const nativeLanguages = await sequelize.query(
-        `SELECT id, name FROM community.vocab_language WHERE id IN (:nativeLanguageIds)`,
-        {
-          replacements: { nativeLanguageIds },
-          type: sequelize.QueryTypes.SELECT
-        }
-      );
-      if (Array.isArray(nativeLanguages)) {
-        const nativeLanguageMap = new Map(nativeLanguages.map(l => [l.id, l.name]));
-        coursesData.forEach(c => {
-          c.nativeLanguageName = c.nativeLanguageId ? nativeLanguageMap.get(c.nativeLanguageId) || null : null;
-        });
-      }
-    }
+    await this._attachLanguageNamesToCourseRows(coursesData);
 
     return coursesData;
   }
@@ -1875,6 +1864,45 @@ export default class VocabService {
     return courseData;
   }
 
+  /** Admin/Support: Kurs inkl. Lektionen ohne Sichtbarkeitsprüfung (nur serverseitig für Staff-Routen). */
+  async adminGetCourseWithLessonsForStaff(courseId) {
+    const course = await VocabCourse.findByPk(Number(courseId), {
+      include: [
+        {
+          model: VocabCourseLesson,
+          as: 'lessons',
+          order: [['lessonNumber', 'ASC']]
+        }
+      ]
+    });
+
+    if (!course) {
+      const err = new Error('Course not found');
+      err.status = 404;
+      throw err;
+    }
+
+    const courseData = course.get({ plain: true });
+    courseData.lessons = courseData.lessons || [];
+
+    courseData.lessons.sort((a, b) => {
+      if (a.weekNumber !== b.weekNumber) {
+        return (a.weekNumber || 999) - (b.weekNumber || 999);
+      }
+      if (a.dayNumber !== b.dayNumber) {
+        return (a.dayNumber || 999) - (b.dayNumber || 999);
+      }
+      return a.lessonNumber - b.lessonNumber;
+    });
+
+    courseData.lessons = courseData.lessons.map((lesson) => ({
+      ...lesson,
+      pedagogy: this._buildLessonPedagogy(lesson)
+    }));
+
+    return courseData;
+  }
+
   async updateCourse(hashedUserId, courseId, { title, description, languageId, nativeLanguageId, difficultyLevel, isPublic }) {
     const user = await this._getUserByHashedId(hashedUserId);
     const course = await VocabCourse.findByPk(courseId);
@@ -2357,6 +2385,40 @@ export default class VocabService {
     }));
   }
 
+  /**
+   * Kurse, in die der Nutzer (per Hash) eingeschrieben ist — jede courseId nur einmal,
+   * bei mehrfachen Einschreibungen zählt die jeweils neueste Zeile.
+   */
+  async listEnrolledVocabCoursesForUser(targetHashedUserId) {
+    const user = await this._getUserByHashedId(targetHashedUserId);
+
+    const enrollments = await VocabCourseEnrollment.findAll({
+      where: { userId: user.id },
+      include: [{ model: VocabCourse, as: 'course', required: true }],
+      order: [['enrolledAt', 'DESC']]
+    });
+
+    const byCourseId = new Map();
+    for (const e of enrollments) {
+      const row = e.course;
+      if (!row) {
+        continue;
+      }
+      const plain = row.get({ plain: true });
+      if (byCourseId.has(plain.id)) {
+        continue;
+      }
+      byCourseId.set(plain.id, {
+        ...plain,
+        enrolledAt: e.enrolledAt
+      });
+    }
+
+    const coursesData = [...byCourseId.values()];
+    await this._attachLanguageNamesToCourseRows(coursesData);
+    return coursesData;
+  }
+
   async getCourseProgress(hashedUserId, courseId) {
     const user = await this._getUserByHashedId(hashedUserId);