feat: Introduce admin pages for pending course review and course details, and instructor pages for course management and lesson quizzes.

frontend_management/components/course/LessonPreviewDialog.vue

@@ -0,0 +1,228 @@
+<template>
+  <q-dialog v-model="isOpen" maximizable>
+    <q-card class="column" style="width: 900px; max-width: 95vw; height: 90vh">
+      <q-card-section class="row items-center q-pb-none bg-gray-50 border-b">
+        <div class="text-h6 font-bold text-gray-900 flex items-center gap-2">
+          <q-icon :name="getIcon(lesson.type)" color="primary" />
+          {{ lesson.title.th }}
+        </div>
+        <q-space />
+        <q-btn icon="close" flat round dense v-close-popup />
+      </q-card-section>
+
+      <q-card-section class="col q-pa-none scroll relative-position">
+        <div v-if="loading" class="absolute-center">
+          <q-spinner-dots size="40px" color="primary" />
+        </div>
+
+        <div v-else-if="lessonDetail" class="p-6 space-y-6">
+          <!-- Video Player -->
+          <div v-if="lesson.type === 'VIDEO' && lessonDetail.video_url" class="aspect-video bg-black rounded-lg overflow-hidden">
+            <video
+              :src="lessonDetail.video_url"
+              controls
+              class="w-full h-full object-contain"
+            ></video>
+          </div>
+
+          <!-- Content (Document/Text) -->
+          <div v-if="lessonDetail.content" class="prose max-w-none">
+            <div v-html="lessonDetail.content.th"></div>
+          </div>
+
+          <!-- Attachments -->
+          <div v-if="lessonDetail.attachments && lessonDetail.attachments.length > 0">
+            <h3 class="text-lg font-semibold mb-3 flex items-center gap-2">
+              <q-icon name="attach_file" />
+              เอกสารแนบ
+            </h3>
+            <div class="grid grid-cols-1 md:grid-cols-2 gap-3">
+              <a
+                v-for="file in lessonDetail.attachments"
+                :key="file.id"
+                :href="file.file_path"
+                target="_blank"
+                class="flex items-center gap-3 p-3 border rounded-lg hover:bg-gray-50 transition-colors"
+              >
+                <q-icon name="description" color="primary" size="24px" />
+                <div class="overflow-hidden">
+                  <div class="font-medium truncate">{{ file.file_name }}</div>
+                  <div class="text-xs text-gray-500">{{ formatFileSize(file.file_size) }}</div>
+                </div>
+              </a>
+            </div>
+          </div>
+
+          <!-- Quiz Info -->
+          <div v-if="lesson.type === 'QUIZ'">
+            <div v-if="lessonDetail.quiz" class="bg-blue-50 p-6 rounded-lg border border-blue-100">
+              <h3 class="text-lg font-bold text-blue-900 mb-2">{{ lessonDetail.quiz.title?.th || 'แบบทดสอบ' }}</h3>
+              <p class="text-blue-800 mb-4">{{ lessonDetail.quiz.description?.th || '-' }}</p>
+              
+              <div class="grid grid-cols-2 md:grid-cols-4 gap-4 text-sm">
+                <div class="bg-white p-3 rounded border border-blue-100">
+                  <div class="text-gray-500 mb-1">เกณฑ์ผ่าน</div>
+                  <div class="font-semibold">{{ lessonDetail.quiz.passing_score }}%</div>
+                </div>
+                <div class="bg-white p-3 rounded border border-blue-100">
+                  <div class="text-gray-500 mb-1">เวลาทำข้อสอบ</div>
+                  <div class="font-semibold">{{ lessonDetail.quiz.time_limit ? lessonDetail.quiz.time_limit + ' นาที' : '-' }}</div>
+                </div>
+                <div class="bg-white p-3 rounded border border-blue-100">
+                  <div class="text-gray-500 mb-1">จำนวนข้อ</div>
+                  <div class="font-semibold">{{ lessonDetail.quiz.questions?.length || 0 }} ข้อ</div>
+                </div>
+              </div>
+
+              <!-- Questions List -->
+              <div v-if="lessonDetail.quiz.questions && lessonDetail.quiz.questions.length > 0" class="mt-6 space-y-6">
+                <!-- ... (questions rendering code unchanged) ... -->
+                <div v-for="(question, index) in lessonDetail.quiz.questions" :key="question.id" class="bg-white p-4 rounded-lg border border-blue-100">
+                  <div class="flex gap-3">
+                    <span class="font-bold text-blue-600 text-lg">{{ index + 1 }}.</span>
+                    <div class="flex-1">
+                      <p class="font-medium text-gray-900 text-lg mb-2">{{ question.question?.th || 'คำถาม' }}</p>
+                      
+                      <!-- Choices -->
+                      <div class="space-y-2 mt-3">
+                        <div 
+                          v-for="choice in question.choices" 
+                          :key="choice.id"
+                          class="p-3 rounded border flex items-center gap-3"
+                          :class="choice.is_correct ? 'bg-green-50 border-green-200' : 'bg-gray-50 border-gray-200'"
+                        >
+                          <div 
+                            class="w-5 h-5 rounded-full border-2 flex items-center justify-center flex-shrink-0"
+                            :class="choice.is_correct ? 'border-green-500' : 'border-gray-400'"
+                          >
+                            <div v-if="choice.is_correct" class="w-2.5 h-2.5 rounded-full bg-green-500"></div>
+                          </div>
+                          <div :class="choice.is_correct ? 'text-green-700 font-medium' : 'text-gray-700'">
+                            <div>{{ choice.text?.th || '-' }}</div>
+                            <div v-if="choice.text?.en" class="text-xs opacity-75">{{ choice.text.en }}</div>
+                          </div>
+                          <q-icon v-if="choice.is_correct" name="check_circle" color="green" class="ml-auto" />
+                        </div>
+                      </div>
+
+                      <!-- Explanation -->
+                      <div v-if="question.explanation?.th" class="mt-4 bg-yellow-50 p-3 rounded text-sm text-yellow-800 border border-yellow-100">
+                        <div class="font-semibold mb-1 flex items-center gap-1">
+                          <q-icon name="lightbulb" />
+                          คำอธิบาย:
+                        </div>
+                        {{ question.explanation.th }}
+                      </div>
+                    </div>
+                  </div>
+                </div>
+              </div>
+            </div>
+            
+            <!-- Fallback for missing Quiz Data -->
+            <div v-else class="flex flex-col items-center justify-center p-10 text-gray-500 bg-gray-50 rounded-lg border border-dashed">
+              <q-icon name="assignment_late" size="48px" class="mb-2" />
+              <p>ไม่พบข้อมูลแบบทดสอบ หรือแบบทดสอบยังไม่สมบูรณ์</p>
+            </div>
+          </div>
+        </div>
+
+        <div v-else class="flex flex-col items-center justify-center h-full text-gray-500">
+          <q-icon name="error_outline" size="48px" class="mb-2" />
+          <p>ไม่พบข้อมูลบทเรียน</p>
+        </div>
+      </q-card-section>
+    </q-card>
+  </q-dialog>
+</template>
+
+<script setup lang="ts">
+import { ref, watch, computed } from 'vue';
+import { useQuasar } from 'quasar';
+import { instructorService, type LessonResponse, type LessonDetailResponse } from '~/services/instructor.service';
+
+const props = defineProps<{
+  modelValue: boolean;
+  lesson: LessonResponse;
+  courseId: number;
+}>();
+
+const emit = defineEmits(['update:modelValue']);
+const $q = useQuasar();
+
+const loading = ref(false);
+const lessonDetail = ref<LessonDetailResponse | null>(null);
+
+const isOpen = computed({
+  get: () => props.modelValue,
+  set: (val) => emit('update:modelValue', val)
+});
+
+const getIcon = (type: string) => {
+  const icons: Record<string, string> = {
+    VIDEO: 'play_circle',
+    DOCUMENT: 'description',
+    QUIZ: 'quiz'
+  };
+  return icons[type] || 'article';
+};
+
+const formatFileSize = (bytes: number) => {
+  if (bytes === 0) return '0 Bytes';
+  const k = 1024;
+  const sizes = ['Bytes', 'KB', 'MB', 'GB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
+};
+
+const fetchLessonDetail = async () => {
+  // Always verify lesson and courseId exist
+  if (!props.lesson || !props.courseId) return;
+  
+  loading.value = true;
+  try {
+    const data = await instructorService.getLesson(
+      props.courseId, 
+      props.lesson.chapter_id, 
+      props.lesson.id
+    );
+    console.log('Fetched Lesson Details:', data);
+
+    // FIX: Handle case where API returns Quiz object directly instead of LessonDetailResponse
+    if (props.lesson.type === 'QUIZ' && !data.quiz && (data as any).questions) {
+      console.warn('API returned Quiz object directly, wrapping it.');
+      lessonDetail.value = {
+        ...props.lesson,
+        attachments: [], // Assume no attachments if structure is unexpected
+        quiz: data as any
+      };
+    } else {
+      lessonDetail.value = data;
+    }
+  } catch (error) {
+    console.error('Failed to fetch lesson detail:', error);
+    $q.notify({
+      type: 'negative',
+      message: 'ไม่สามารถโหลดข้อมูลบทเรียนได้'
+    });
+  } finally {
+    loading.value = false;
+  }
+};
+
+watch(() => props.modelValue, (val) => {
+  if (val) {
+    fetchLessonDetail();
+  } else {
+    // Optional: clear detail to avoid flashing old content next time
+    // lessonDetail.value = null; 
+  }
+}, { immediate: true });
+
+// Also watch lesson ID in case dialog stays open but lesson changes
+watch(() => props.lesson.id, () => {
+  if (props.modelValue) {
+    fetchLessonDetail();
+  }
+});
+</script>

frontend_management/components/course/StructureTab.vue

@@ -3,14 +3,15 @@
     <div class="flex justify-between items-center mb-6">
       <h2 class="text-xl font-semibold text-gray-900">โครงสร้างบทเรียน</h2>
       <q-btn
+        v-if="course.status === 'DRAFT'"
         color="primary"
         label="จัดการโครงสร้าง"
-        @click="navigateTo(`/instructor/courses/${courseId}/structure`)"
+        @click="navigateTo(`/instructor/courses/${course.id}/structure`)"
       />
     </div>
 
     <!-- Chapters -->
-    <div v-if="chapters.length === 0" class="text-center py-10 text-gray-500">
+    <div v-if="course.chapters.length === 0" class="text-center py-10 text-gray-500">
       ยังไม่มีบทเรียน
     </div>
 
@@ -41,6 +42,10 @@
             v-for="lesson in getSortedLessons(chapter)"
             :key="lesson.id"
             class="py-3"
+            :class="{ 'cursor-pointer hover:bg-gray-50': course.status === 'APPROVED' }"
+            :clickable="course.status === 'APPROVED'"
+            :v-ripple="course.status === 'APPROVED'"
+            @click="handleLessonClick(lesson)"
           >
             <q-item-section avatar>
               <q-icon
@@ -53,26 +58,38 @@
                 Lesson {{ chapter.sort_order }}.{{ lesson.sort_order }}: {{ lesson.title.th }}
               </q-item-label>
             </q-item-section>
+            
+            <q-item-section side v-if="course.status === 'APPROVED'">
+              <q-icon name="visibility" size="xs" color="grey-5" />
+            </q-item-section>
           </q-item>
         </q-list>
       </q-card>
     </div>
+
+    <!-- Lesson Preview Dialog -->
+    <LessonPreviewDialog
+      v-if="previewLesson"
+      v-model="showPreview"
+      :lesson="previewLesson"
+      :course-id="course.id"
+    />
   </div>
 </template>
 
 <script setup lang="ts">
-import type { ChapterResponse } from '~/services/instructor.service';
+import type { CourseDetailResponse, ChapterResponse, LessonResponse } from '~/services/instructor.service';
+import LessonPreviewDialog from './LessonPreviewDialog.vue';
 
 interface Props {
-  courseId: number;
-  chapters: ChapterResponse[];
+  course: CourseDetailResponse;
 }
 
 const props = defineProps<Props>();
 
 // Computed
 const sortedChapters = computed(() => {
-  return props.chapters.slice().sort((a, b) => a.sort_order - b.sort_order);
+  return props.course.chapters.slice().sort((a, b) => a.sort_order - b.sort_order);
 });
 
 // Methods
@@ -101,4 +118,15 @@ const getLessonIconColor = (type: string) => {
   };
   return colors[type] || 'grey';
 };
+
+// Preview
+const showPreview = ref(false);
+const previewLesson = ref<LessonResponse | null>(null);
+
+const handleLessonClick = (lesson: LessonResponse) => {
+  if (props.course.status === 'APPROVED') {
+    previewLesson.value = lesson;
+    showPreview.value = true;
+  }
+};
 </script>

frontend_management/pages/admin/courses/[id].vue

@@ -323,7 +323,7 @@ const getLessonIcon = (type: string) => {
 const getLessonTypeColor = (type: string) => {
   const colors: Record<string, string> = {
     VIDEO: 'blue',
-    QUIZ: 'purple',
+    QUIZ: 'orange',
     DOCUMENT: 'teal'
   };
   return colors[type] || 'grey';

frontend_management/pages/admin/courses/pending.vue

@@ -3,6 +3,7 @@
     <!-- Header -->
     <div class="flex justify-between items-center mb-6">
       <h1 class="text-2xl font-bold text-primary-600">คอร์สรออนุมัติ</h1>
+      <div class="flex gap-4">
         <q-btn
           outline
           color="primary"
@@ -12,6 +13,7 @@
           @click="fetchPendingCourses"
         />
       </div>
+    </div>
 
     <!-- Stats Cards -->
     <div class="grid grid-cols-1 md:grid-cols-3 gap-4 mb-6">
@@ -47,6 +49,17 @@
       </q-input>
     </div>
 
+    <div class="flex justify-end mb-6">
+      <q-btn-toggle
+          v-model="viewMode"
+          toggle-color="primary"
+          :options="[
+            { label: 'การ์ด', value: 'card' },
+            { label: 'ตาราง', value: 'table' }
+          ]"
+        />
+    </div>
+
     <!-- Pending Courses List -->
     <div v-if="loading" class="flex justify-center py-12">
       <q-spinner color="primary" size="48px" />
@@ -57,7 +70,8 @@
       <p class="text-gray-500 mt-4">ไม่มีคอร์สที่รอการอนุมัติ</p>
     </div>
 
-    <div v-else class="space-y-4">
+    <!-- Card View -->
+    <div v-else-if="viewMode === 'card'" class="space-y-4">
       <div
         v-for="course in filteredCourses"
         :key="course.id"
@@ -125,6 +139,78 @@
         </div>
       </div>
     </div>
+
+    <!-- Table View -->
+    <div v-else class="bg-white rounded-xl shadow-sm overflow-hidden">
+      <q-table
+        :rows="filteredCourses"
+        :columns="columns"
+        row-key="id"
+        flat
+        bordered
+        :pagination="{ rowsPerPage: 10 }"
+      >
+        <!-- Thumbnail Slot -->
+        <template v-slot:body-cell-thumbnail="props">
+          <q-td :props="props">
+            <div class="w-16 h-10 rounded overflow-hidden bg-gray-100">
+              <img 
+                v-if="props.row.thumbnail_url" 
+                :src="props.row.thumbnail_url" 
+                class="w-full h-full object-cover"
+              />
+               <div v-else class="w-full h-full flex items-center justify-center">
+                <q-icon name="school" color="grey" />
+              </div>
+            </div>
+          </q-td>
+        </template>
+
+        <!-- Title Slot -->
+        <template v-slot:body-cell-title="props">
+          <q-td :props="props">
+            <div class="font-semibold">{{ props.row.title.th }}</div>
+            <div class="text-xs text-gray-500">{{ props.row.title.en }}</div>
+          </q-td>
+        </template>
+
+        <!-- Stats Slot -->
+        <template v-slot:body-cell-stats="props">
+          <q-td :props="props">
+             <div class="text-xs">
+                <div>{{ props.row.chapters_count }} บท</div>
+                <div>{{ props.row.lessons_count }} บทเรียน</div>
+             </div>
+          </q-td>
+        </template>
+
+        <!-- Submission Slot -->
+        <template v-slot:body-cell-submitted_at="props">
+          <q-td :props="props">
+            <div v-if="props.row.latest_submission">
+               <div class="text-xs">{{ formatDate(props.row.latest_submission.created_at) }}</div>
+               <div class="text-xs text-gray-500">โดย {{ props.row.latest_submission.submitter.username }}</div>
+            </div>
+            <span v-else>-</span>
+          </q-td>
+        </template>
+
+        <!-- Actions Slot -->
+        <template v-slot:body-cell-actions="props">
+          <q-td :props="props">
+            <q-btn
+              flat
+              round
+              color="primary"
+              icon="visibility"
+              @click="viewCourse(props.row)"
+            >
+              <q-tooltip>ดูรายละเอียด</q-tooltip>
+            </q-btn>
+          </q-td>
+        </template>
+      </q-table>
+    </div>
   </div>
 </template>
 
@@ -144,6 +230,16 @@ const router = useRouter();
 const courses = ref<PendingCourse[]>([]);
 const loading = ref(true);
 const searchQuery = ref('');
+const viewMode = ref('table');
+
+const columns = [
+  { name: 'thumbnail', label: 'รูปปก', field: 'thumbnail', align: 'left' },
+  { name: 'title', label: 'ชื่อคอร์ส', field: (row: PendingCourse) => row.title.th, align: 'left', sortable: true },
+  { name: 'instructor', label: 'ผู้สอน', field: (row: PendingCourse) => getPrimaryInstructor(row), align: 'left', sortable: true },
+  { name: 'stats', label: 'จำนวนบท', field: 'stats', align: 'center' },
+  { name: 'submitted_at', label: 'วันที่ส่ง', field: (row: PendingCourse) => row.latest_submission?.created_at, align: 'left', sortable: true },
+  { name: 'actions', label: '', field: 'actions', align: 'center' }
+];
 
 // Computed
 const totalChapters = computed(() => 

frontend_management/pages/instructor/courses/[id]/chapters/[chapterId]/lessons/[lessonId]/quiz.vue

@@ -230,9 +230,10 @@
                         :color="choice.is_correct ? 'positive' : 'grey'"
                         size="18px"
                       />
-                      <span :class="{ 'text-green-600 font-medium': choice.is_correct }">
-                        {{ choice.text.th || `ตัวเลือก ${Number(cIndex) + 1}` }}
-                      </span>
+                      <div :class="{ 'text-green-600 font-medium': choice.is_correct }">
+                        <div>{{ choice.text.th || `ตัวเลือก ${Number(cIndex) + 1}` }}</div>
+                        <div v-if="choice.text.en" class="text-xs opacity-75">{{ choice.text.en }}</div>
+                      </div>
                     </div>
                   </div>
                 </q-card-section>
@@ -296,13 +297,21 @@
                   :val="cIndex"
                   @update:model-value="setCorrectChoice(cIndex)"
                 />
+                <div class="flex-1">
                   <q-input
                     v-model="choice.text.th"
-                  :label="`ตัวเลือก ${cIndex + 1}`"
+                    :label="`ตัวเลือก ${cIndex + 1} (TH)`"
                     outlined
                     dense
-                  class="flex-1"
+                    class="mb-2"
                   />
+                  <q-input
+                    v-model="choice.text.en"
+                    :label="`ตัวเลือก ${cIndex + 1} (EN)`"
+                    outlined
+                    dense
+                  />
+                </div>
                 <q-btn
                   v-if="questionForm.choices.length > 2"
                   flat

frontend_management/pages/instructor/courses/[id]/index.vue

@@ -117,7 +117,7 @@
       <q-tab-panels v-model="activeTab" class="bg-white rounded-b-xl shadow-sm">
         <!-- Structure Tab -->
         <q-tab-panel name="structure" class="p-6">
-          <CourseStructureTab :course-id="course.id" :chapters="course.chapters" />
+          <CourseStructureTab :course="course" />
         </q-tab-panel>
 
         <!-- Students Tab -->