feat(lms): replace is_closed with timer limit and auto-submit logic

lmsege/lms/views.py

@@ -62,31 +62,64 @@ def assignment_detail(request, pk):
     submission = Submission.objects.filter(assignment=assignment, student=request.user).first()
     
     from django.utils import timezone
+    import datetime
+    
+    now = timezone.now()
     can_submit = True
-    if assignment.is_closed:
-        can_submit = False
-    if assignment.deadline and timezone.now() > assignment.deadline:
+    time_left_seconds = None
+    needs_start = False
+
+    if assignment.deadline and now > assignment.deadline:
         can_submit = False
 
-    if submission:
-        if request.method == 'POST':
-            # Do not allow updating
+    if assignment.time_limit:
+        if not submission:
+            needs_start = True
+            can_submit = False # Can't submit until started
+        elif submission.status == 'IN_PROGRESS':
+            if submission.started_at:
+                elapsed = (now - submission.started_at).total_seconds()
+                allowed = assignment.time_limit * 60
+                if elapsed > allowed + 60: # 1 minute grace period for network latency
+                    can_submit = False
+                    submission.is_time_expired = True
+                    submission.status = 'PENDING' # Or graded with 0
+                    submission.save()
+                else:
+                    time_left_seconds = int(allowed - elapsed)
+                    if time_left_seconds < 0:
+                        time_left_seconds = 0
+        else:
+            can_submit = False # Already submitted
+
+    if request.method == 'POST':
+        if needs_start and 'action' in request.POST and request.POST['action'] == 'start':
+            Submission.objects.create(
+                assignment=assignment, 
+                student=request.user, 
+                status='IN_PROGRESS', 
+                started_at=now
+            )
+            return redirect('lms:assignment_detail', pk=pk)
+
+        if submission and submission.status != 'IN_PROGRESS':
             return redirect('lms:dashboard')
-        form = None
-    else:
-        if not can_submit:
-            form = None
-        elif request.method == 'POST':
+            
+        if can_submit and not needs_start:
             form = AnswersForm(request.POST, request.FILES, questions=questions)
             if form.is_valid():
-                submission = Submission.objects.create(assignment=assignment, student=request.user)
+                if not submission:
+                    submission = Submission.objects.create(assignment=assignment, student=request.user)
                 
                 all_auto = True
                 total_points = 0
                 max_points = 0
                 
                 for q in questions:
-                    answer_obj = Answer(submission=submission, question=q)
+                    answer_obj = Answer.objects.filter(submission=submission, question=q).first()
+                    if not answer_obj:
+                        answer_obj = Answer(submission=submission, question=q)
+                        
                     if q.question_type == 'TEXT_AUTO':
                         val = form.cleaned_data.get(f'answer_{q.id}', '')
                         answer_obj.text_answer = val
@@ -142,7 +175,12 @@ def assignment_detail(request, pk):
                 submission.save()
                 return redirect('lms:dashboard')
         else:
+            form = None
+    else:
+        if can_submit and not needs_start:
             form = AnswersForm(questions=questions)
+        else:
+            form = None
         
     question_fields = []
     if form:
@@ -165,4 +203,6 @@ def assignment_detail(request, pk):
         'questions': questions,
         'question_fields': question_fields,
         'can_submit': can_submit,
+        'needs_start': needs_start,
+        'time_left_seconds': time_left_seconds,
     })