admin: implement MCQ edition in interface

admin/api/exercice.go

@@ -38,6 +38,7 @@ func init() {
 
 	router.GET("/api/exercices/:eid/quiz", apiHandler(exerciceHandler(listExerciceQuiz)))
 	router.GET("/api/exercices/:eid/quiz/:qid", apiHandler(quizHandler(showExerciceQuiz)))
+	router.PUT("/api/exercices/:eid/quiz/:qid", apiHandler(quizHandler(updateExerciceQuiz)))
 	router.DELETE("/api/exercices/:eid/quiz/:qid", apiHandler(quizHandler(deleteExerciceQuiz)))
 
 	// Synchronize
@@ -239,7 +240,71 @@ func showExerciceQuiz(quiz fic.MCQ, _ fic.Exercice, body []byte) (interface{}, e
 	return quiz, nil
 }
 
+func updateExerciceQuiz(quiz fic.MCQ, exercice fic.Exercice, body []byte) (interface{}, error) {
+	var uq fic.MCQ
+	if err := json.Unmarshal(body, &uq); err != nil {
+		return nil, err
+	}
+
+	quiz.Title = uq.Title
+
+	if _, err := quiz.Update(); err != nil {
+		return nil, err
+	}
+
+	// Update and remove old entries
+	var delete []int
+	for i, cur := range quiz.Entries {
+		seen := false
+		for _, next := range uq.Entries {
+			if cur.Id == next.Id {
+				seen = true
+
+				if cur.Label != next.Label || cur.Response != next.Response {
+					cur.Label = next.Label
+					cur.Response = next.Response
+					if _, err := cur.Update(); err != nil {
+						return nil, err
+					}
+				}
+
+				break
+			}
+		}
+
+		if seen == false {
+			if _, err := cur.Delete(); err != nil {
+				return nil, err
+			} else {
+				delete = append(delete, i)
+			}
+		}
+	}
+	for n, i := range delete {
+		quiz.Entries = append(quiz.Entries[:i-n-1], quiz.Entries[:i-n+1]...)
+	}
+
+	// Add new choices
+	for _, choice := range uq.Entries {
+		if choice.Id == 0 {
+			if c, err := quiz.AddEntry(choice.Label, choice.Response); err != nil {
+				return nil, err
+			} else {
+				quiz.Entries = append(quiz.Entries, c)
+			}
+		}
+	}
+
+	return quiz, nil
+}
+
 func deleteExerciceQuiz(quiz fic.MCQ, _ fic.Exercice, _ []byte) (interface{}, error) {
+	for _, choice := range quiz.Entries {
+		if _, err := choice.Delete(); err != nil {
+			return nil, err
+		}
+	}
+
 	return quiz.Delete()
 }