feat: Add useCourse composable for course-related data and logic.

Frontend-Learner/composables/useCourse.ts

@@ -65,6 +65,38 @@ interface EnrolledCourseResponse {
     limit: number
 }
 
+// Interface สำหรับการส่งคำตอบแบบทดสอบ (Quiz Submission)
+export interface QuizAnswerSubmission {
+    question_id: number
+    choice_id: number
+}
+
+export interface QuizSubmitRequest {
+    answers: QuizAnswerSubmission[]
+}
+
+// Interface สำหรับผลลัพธ์การสอบ (Quiz Result)
+export interface QuizResult {
+    answers_review: {
+        score: number
+        is_correct: boolean
+        correct_choice_id: number
+        selected_choice_id: number
+        question_id: number
+    }[]
+    completed_at: string
+    started_at: string
+    attempt_number: number
+    passing_score: number
+    is_passed: boolean
+    correct_answers: number
+    total_questions: number
+    total_score: number
+    score: number
+    quiz_id: number
+    attempt_id: number
+}
+
 // ==========================================
 // Composable: useCourse
 // หน้าที่: จัดการ Logic ทุกอย่างเกี่ยวกับคอร์สเรียน
@@ -394,6 +426,39 @@ export const useCourse = () => {
         }
     }
 
+
+
+
+    // ฟังก์ชันส่งคำตอบ Quiz
+    // Endpoint: POST /students/courses/:cid/lessons/:lid/quiz/submit
+    const submitQuiz = async (courseId: number, lessonId: number, answers: QuizAnswerSubmission[]) => {
+        try {
+            const body: QuizSubmitRequest = { answers }
+
+            const data = await $fetch<{ code: number; message: string; data: QuizResult }>(`${API_BASE_URL}/students/courses/${courseId}/lessons/${lessonId}/quiz/submit`, {
+                method: 'POST',
+                headers: token.value ? {
+                    Authorization: `Bearer ${token.value}`
+                } : {},
+                body: body
+            })
+
+            return {
+                success: true,
+                data: data.data
+            }
+        } catch (err: any) {
+            console.error('Submit quiz failed:', err)
+             return {
+                success: false,
+                error: err.data?.message || err.message || 'Error submitting quiz',
+                code: err.data?.code,
+                status: err.status
+            }
+        }
+    }
+
+
     return {
         fetchCourses,
         fetchCourseById,
@@ -404,7 +469,8 @@ export const useCourse = () => {
         checkLessonAccess,
         saveVideoProgress,
         fetchVideoProgress,
-        markLessonComplete
+        markLessonComplete,
+        submitQuiz
     }
 }