Merge branch 'tomergewithmaster'

7 files changed, 113 insertions, 64 deletions

diff --git a/testapp/exam/forms.py b/testapp/exam/forms.py
index f04fdb3..169632d 100644
--- a/testapp/exam/forms.py
+++ b/testapp/exam/forms.py
@@ -32,6 +32,12 @@ question_types = (
 UNAME_CHARS = letters + "._" + digits
 PWD_CHARS = letters + punctuation + digits
 
+attempts = [(i, i) for i in range(1, 6)]
+attempts.append((-1, 'Infinite'))
+
+days_between_attempts = ((j, j) for j in range(401))
+
+
 class UserRegisterForm(forms.Form):
     """A Class to create new form for User's Registration.
     It has the various fields and functions required to register
@@ -143,6 +149,10 @@ class QuizForm(forms.Form):
     pass_criteria = forms.FloatField(initial=40,
                                      help_text='Will be taken as percentage')
     language = forms.CharField(widget=forms.Select(choices=languages))
+    attempts_allowed = forms.IntegerField(widget=forms.Select(choices=attempts))
+    time_between_attempts = forms.IntegerField\
+            (widget=forms.Select(choices=days_between_attempts),
+                    help_text='Will be in days')
 
     def save(self):
         start_date = self.cleaned_data["start_date"]
@@ -152,6 +162,8 @@ class QuizForm(forms.Form):
         pass_criteria = self.cleaned_data["pass_criteria"]
         language = self.cleaned_data["language"]
         prerequisite = self.cleaned_data["prerequisite"]
+        attempts_allowed = self.cleaned_data["attempts_allowed"]
+        time_between_attempts = self.cleaned_data["time_between_attempts"]
         new_quiz = Quiz()
         new_quiz.start_date = start_date
         new_quiz.duration = duration
@@ -160,6 +172,8 @@ class QuizForm(forms.Form):
         new_quiz.pass_criteria = pass_criteria
         new_quiz.language = language
         new_quiz.prerequisite_id = prerequisite
+        new_quiz.attempts_allowed = attempts_allowed
+        new_quiz.time_between_attempts = time_between_attempts
         new_quiz.save()
 
 
diff --git a/testapp/exam/models.py b/testapp/exam/models.py
index 196ee73..259f875 100644
--- a/testapp/exam/models.py
+++ b/testapp/exam/models.py
@@ -31,7 +31,15 @@ question_types = (
         ("mcc", "Multiple Correct Choices"),
         ("code", "Code"),
                         )
+attempts = [(i, i) for i in range(1, 6)]
+attempts.append((-1, 'Infinite'))
 
+days_between_attempts = ((j, j) for j in range(401))
+
+test_status = (
+                ('inprogress', 'Inprogress'),
+                ('completed', 'Completed'),
+              )
 
 ###############################################################################
 class Question(models.Model):
@@ -125,6 +133,12 @@ class Quiz(models.Model):
     # Programming language for a quiz
     language = models.CharField(max_length=20, choices=languages)
 
+    # Number of attempts for the quiz
+    attempts_allowed = models.IntegerField(default=1, choices=attempts)
+
+    time_between_attempts = models.IntegerField("Number of Days",\
+            choices=days_between_attempts)
+
     class Meta:
         verbose_name_plural = "Quizzes"
 
@@ -171,9 +185,9 @@ class QuestionPaper(models.Model):
             questions += question_set.get_random_questions()
         return questions
 
-    def make_answerpaper(self, user, ip):
+    def make_answerpaper(self, user, ip, attempt_no):
         """Creates an  answer paper for the user to attempt the quiz"""
-        ans_paper = AnswerPaper(user=user, profile=user.profile, user_ip=ip)
+        ans_paper = AnswerPaper(user=user, user_ip=ip, attempt_number=attempt_no)
         ans_paper.start_time = datetime.datetime.now()
         ans_paper.end_time = ans_paper.start_time \
                              + datetime.timedelta(minutes=self.quiz.duration)
@@ -214,10 +228,6 @@ class AnswerPaper(models.Model):
     # The user taking this question paper.
     user = models.ForeignKey(User)
 
-    # The user's profile, we store a reference to make it easier to access the
-    # data.
-    profile = models.ForeignKey(Profile)
-
     # All questions that remain to be attempted for a particular Student
     # (a list of ids separated by '|')
     questions = models.CharField(max_length=128)
@@ -225,6 +235,9 @@ class AnswerPaper(models.Model):
     # The Quiz to which this question paper is attached to.
     question_paper = models.ForeignKey(QuestionPaper)
 
+    # The attempt number for the question paper.
+    attempt_number = models.IntegerField()
+
     # The time when this paper was started by the user.
     start_time = models.DateTimeField()
 
@@ -252,6 +265,10 @@ class AnswerPaper(models.Model):
     # Result of the quiz, True if student passes the exam.
     passed = models.NullBooleanField()
 
+    # Status of the quiz attempt
+    status = models.CharField(max_length=20, choices=test_status,\
+            default='inprogress')
+
     def current_question(self):
         """Returns the current active question to display."""
         qs = self.questions.split('|')
@@ -343,6 +360,10 @@ class AnswerPaper(models.Model):
             else:
                 self.passed = False
 
+    def update_status(self):
+        """ Sets status to completed """
+        self.status = 'completed'
+
     def get_question_answers(self):
         """
             Return a dictionary with keys as questions and a list of the
diff --git a/testapp/exam/templates/exam/intro.html b/testapp/exam/templates/exam/intro.html
index ec1888a..58068ed 100644
--- a/testapp/exam/templates/exam/intro.html
+++ b/testapp/exam/templates/exam/intro.html
@@ -27,7 +27,7 @@
          </ul>
           <p> We hope you enjoy taking this exam !!!</p>
 
-          <form action="{{URL_ROOT}}/exam/start/{{ paper_id }}/" method="post" align="center">
+          <form action="{{URL_ROOT}}/exam/start/{{ attempt_no }}/{{ paper_id }}/" method="post" align="center">
            {% csrf_token %}
            <center><button class="btn" type="submit" name="start">Start Exam!</button></center>
           </form>
diff --git a/testapp/exam/templates/exam/question.html b/testapp/exam/templates/exam/question.html
index a3e8629..855a29e 100644
--- a/testapp/exam/templates/exam/question.html
+++ b/testapp/exam/templates/exam/question.html
@@ -74,7 +74,7 @@ function setSnippetHeight()
         <ul>
         <li> <h5><a> Hi {{user.first_name.title}} {{user.last_name.title}}  </a></h5>
         </ul>
-        <form id="logout" action="{{URL_ROOT}}/exam/quit/{{ paper.question_paper.id }}/" method="post" class="pull-right">
+        <form id="logout" action="{{URL_ROOT}}/exam/quit/{{ paper.attempt_number }}/{{ paper.question_paper.id }}/" method="post" class="pull-right">
         {% csrf_token %}
          <button class="btn" type="submit" name="quit">Quit Exam</button> </li>
 
@@ -94,13 +94,8 @@ function setSnippetHeight()
 	 {% endfor%}
 	 </div>{% endif %}
 
-         {% if success_msg %}
-         <script type="text/javascript">
-            alert("Congratulations, that's correct. Let's go to next question");
-         </script>
-         {% endif %}
          <p id="status"></p>
-         <form id="code" action="{{URL_ROOT}}/exam/{{ question.id }}/check/{{ paper.question_paper.id }}/" method="post">
+         <form id="code" action="{{URL_ROOT}}/exam/{{ question.id }}/check/{{ paper.attempt_number }}/{{ paper.question_paper.id }}/" method="post">
          {% csrf_token %}
          {% if question.type == "mcq" %}
          {% for option in question.options.strip.splitlines %}
diff --git a/testapp/exam/templates/exam/quit.html b/testapp/exam/templates/exam/quit.html
index fee11ed..2c347cb 100644
--- a/testapp/exam/templates/exam/quit.html
+++ b/testapp/exam/templates/exam/quit.html
@@ -7,8 +7,8 @@
         <center><h4>Your current answers are saved.</h4></center>
 	<center><h4> Are you sure you wish to quit the exam?</h4></center>
    	<center><h4> Be sure, as you won't be able to restart this exam.</h4></center>
-	<form action="{{URL_ROOT}}/exam/complete/{{ id }}/" method="post">
+    <form action="{{URL_ROOT}}/exam/complete/{{ attempt_no }}/{{ id }}/" method="post">
 	{% csrf_token %}
-	<center><button class="btn" type="submit" name="yes">Yes!</button>&nbsp;<button class="btn" type="button" name="no" onClick="window.location='{{ URL_ROOT }}/exam/start/{{ id }}/'">No!</button></center>
+    <center><button class="btn" type="submit" name="yes">Yes!</button>&nbsp;<button class="btn" type="button" name="no" onClick="window.location='{{ URL_ROOT }}/exam/start/{{ attempt_no }}/{{ id }}/'">No!</button></center>
 	</form>
 {% endblock content %}
diff --git a/testapp/exam/urls.py b/testapp/exam/urls.py
index f8a6cb8..d71329c 100644
--- a/testapp/exam/urls.py
+++ b/testapp/exam/urls.py
@@ -6,15 +6,15 @@ urlpatterns = patterns('testapp.exam.views',
     url(r'^quizzes/$','quizlist_user'),
     url(r'^results/$','results_user'),
     url(r'^start/$', 'start'),
-    url(r'^start/(?P<questionpaper_id>\d+)/$','start'),
-    url(r'^quit/(?P<questionpaper_id>\d+)/$', 'quit'),
+    url(r'^start/(?P<attempt_no>\d+)/(?P<questionpaper_id>\d+)/$','start'),
+    url(r'^quit/(?P<attempt_no>\d+)/(?P<questionpaper_id>\d+)/$', 'quit'),
     url(r'^intro/(?P<questionpaper_id>\d+)/$','intro'),
     url(r'^complete/$', 'complete'),
-    url(r'^complete/(?P<questionpaper_id>\d+)/$', 'complete'),
+    url(r'^complete/(?P<attempt_no>\d+)/(?P<questionpaper_id>\d+)/$', 'complete'),
     url(r'^register/$', 'user_register'),
     url(r'^(?P<q_id>\d+)/$', 'question'),
     url(r'^(?P<q_id>\d+)/check/$', 'check'),
-    url(r'^(?P<q_id>\d+)/check/(?P<questionpaper_id>\d+)/$', 'check'),
+    url(r'^(?P<q_id>\d+)/check/(?P<attempt_no>\d+)/(?P<questionpaper_id>\d+)/$', 'check'),
     url(r'^intro/$', 'start'),
 
     url(r'^manage/$', 'prof_manage'),
diff --git a/testapp/exam/views.py b/testapp/exam/views.py
index c6e3024..8fde7a7 100644
--- a/testapp/exam/views.py
+++ b/testapp/exam/views.py
@@ -139,7 +139,7 @@ def quizlist_user(request):
     user = request.user
     avail_quizzes = list(QuestionPaper.objects.filter(quiz__active=True))
     user_answerpapers = AnswerPaper.objects.filter(user=user)
-    quizzes_taken = []
+    quizzes_taken = user_answerpapers
     pre_requisites = []
     context = {}
 
@@ -152,13 +152,6 @@ def quizlist_user(request):
         context['quizzes_taken'] = None
         return my_render_to_response("exam/quizzes_user.html", context)
 
-    for answer_paper in user_answerpapers:
-        for quiz in avail_quizzes:
-            if answer_paper.question_paper.id == quiz.id and \
-            answer_paper.end_time != answer_paper.start_time:
-                avail_quizzes.remove(quiz)
-                quizzes_taken.append(answer_paper)
-
     context['quizzes'] = avail_quizzes
     context['user'] = user
     context['quizzes_taken'] = quizzes_taken
@@ -170,27 +163,45 @@ def intro(request, questionpaper_id):
     user = request.user
     ci = RequestContext(request)
     quest_paper = QuestionPaper.objects.get(id=questionpaper_id)
+    attempt_number = quest_paper.quiz.attempts_allowed
+    time_lag = quest_paper.quiz.time_between_attempts
+
     if quest_paper.quiz.prerequisite:
         try:
-            pre_quest = QuestionPaper.objects.get(quiz=quest_paper.quiz.prerequisite)
-            answer_paper = AnswerPaper.objects.get(
-                           question_paper=pre_quest,
-                           user=user)
-            if answer_paper.passed:
-                context = {'user': user, 'paper_id': questionpaper_id}
-                return my_render_to_response('exam/intro.html', context,
-                                             context_instance=ci)
-            else:
+            pre_quest = QuestionPaper.objects.get(
+                    quiz=quest_paper.quiz.prerequisite)
+            answer_papers = AnswerPaper.objects.filter(
+                    question_paper=pre_quest, user=user)
+            answer_papers_failed = AnswerPaper.objects.filter(
+                    question_paper=pre_quest, user=user, passed=False)
+            if answer_papers.count() == answer_papers_failed.count():
                 context = {'user': user, 'cannot_attempt': True}
                 return my_redirect("/exam/quizzes/?cannot_attempt=True")
-
         except:
             context = {'user': user, 'cannot_attempt': True}
             return my_redirect("/exam/quizzes/?cannot_attempt=True")
-    context = {'user': user, 'paper_id': questionpaper_id}
-    ci = RequestContext(request)
-    return my_render_to_response('exam/intro.html', context,
-                                 context_instance=ci)
+
+    attempted_papers = AnswerPaper.objects.filter(question_paper=quest_paper,
+            user=user)
+    already_attempted = attempted_papers.count()
+    if already_attempted == 0:
+        context = {'user': user, 'paper_id': questionpaper_id,\
+                'attempt_no': already_attempted + 1}
+        return my_render_to_response('exam/intro.html', context,
+                                     context_instance=ci)
+    if already_attempted < attempt_number:
+        previous_attempt_day = attempted_papers[already_attempted-1].start_time
+        today = datetime.datetime.today()
+        days_after_attempt = (today - previous_attempt_day).days
+        if days_after_attempt >= time_lag:
+            context = {'user': user, 'paper_id': questionpaper_id,\
+                    'attempt_no': already_attempted + 1}
+            return my_render_to_response('exam/intro.html', context,
+                                         context_instance=ci)
+        else:
+            return my_redirect("/exam/quizzes/")
+    else:
+        return my_redirect("/exam/quizzes/")
 
 
 def results_user(request):
@@ -367,6 +378,8 @@ def add_quiz(request, quiz_id=None):
                 d.pass_criteria = form['pass_criteria'].data
                 d.language = form['language'].data
                 d.prerequisite_id = form['prerequisite'].data
+                d.attempts_allowed = form['attempts_allowed'].data
+                d.time_between_attempts = form['time_between_attempts'].data
                 d.save()
                 quiz = Quiz.objects.get(id=quiz_id)
                 return my_redirect("/exam/manage/showquiz")
@@ -390,6 +403,8 @@ def add_quiz(request, quiz_id=None):
             form.initial['pass_criteria'] = d.pass_criteria
             form.initial['language'] = d.language
             form.initial['prerequisite'] = d.prerequisite_id
+            form.initial['attempts_allowed'] = d.attempts_allowed
+            form.initial['time_between_attempts'] = d.time_between_attempts
             return my_render_to_response('exam/add_quiz.html',
                                          {'form': form},
                                          context_instance=ci)
@@ -641,7 +656,7 @@ def user_login(request):
                                      context_instance=ci)
 
 
-def start(request, questionpaper_id=None):
+def start(request, attempt_no=None, questionpaper_id=None):
     """Check the user cedentials and if any quiz is available,
     start the exam."""
     user = request.user
@@ -654,13 +669,13 @@ def start(request, questionpaper_id=None):
     except QuestionPaper.DoesNotExist:
         msg = 'Quiz not found, please contact your '\
             'instructor/administrator. Please login again thereafter.'
-        return complete(request, msg, questionpaper_id)
+        return complete(request, msg, attempt_no, questionpaper_id)
 
     try:
         old_paper = AnswerPaper.objects.get(
-            question_paper=questionpaper, user=user)
+            question_paper=questionpaper, user=user, attempt_number=attempt_no)
         q = old_paper.current_question()
-        return show_question(request, q, questionpaper_id)
+        return show_question(request, q, attempt_no, questionpaper_id)
     except AnswerPaper.DoesNotExist:
         ip = request.META['REMOTE_ADDR']
         key = gen_key(10)
@@ -670,13 +685,13 @@ def start(request, questionpaper_id=None):
             msg = 'You do not have a profile and cannot take the quiz!'
             raise Http404(msg)
 
-        new_paper = questionpaper.make_answerpaper(user, ip,)
+        new_paper = questionpaper.make_answerpaper(user, ip, attempt_no)
         # Make user directory.
         user_dir = get_user_dir(user)
-        return start(request, questionpaper_id)
+        return start(request, attempt_no, questionpaper_id)
 
 
-def question(request, q_id, questionpaper_id, success_msg=None):
+def question(request, q_id, attempt_no, questionpaper_id, success_msg=None):
     """Check the credentials of the user and start the exam."""
 
     user = request.user
@@ -686,7 +701,7 @@ def question(request, q_id, questionpaper_id, success_msg=None):
     try:
         q_paper = QuestionPaper.objects.get(id=questionpaper_id)
         paper = AnswerPaper.objects.get(
-            user=request.user, question_paper=q_paper)
+            user=request.user, attempt_number=attempt_no, question_paper=q_paper)
     except AnswerPaper.DoesNotExist:
         return my_redirect('/exam/start/')
     if not paper.question_paper.quiz.active:
@@ -713,21 +728,22 @@ def question(request, q_id, questionpaper_id, success_msg=None):
                                  context_instance=ci)
 
 
-def show_question(request, q_id, questionpaper_id, success_msg=None):
+def show_question(request, q_id, attempt_no, questionpaper_id, success_msg=None):
     """Show a question if possible."""
     if len(q_id) == 0:
         msg = 'Congratulations!  You have successfully completed the quiz.'
-        return complete(request, msg, questionpaper_id)
+        return complete(request, msg, attempt_no, questionpaper_id)
     else:
-        return question(request, q_id, questionpaper_id, success_msg)
+        return question(request, q_id, attempt_no, questionpaper_id, success_msg)
 
 
-def check(request, q_id, questionpaper_id=None):
+def check(request, q_id, attempt_no=None, questionpaper_id=None):
     """Checks the answers of the user for particular question"""
 
     user = request.user
     q_paper = QuestionPaper.objects.get(id=questionpaper_id)
-    paper = AnswerPaper.objects.get(user=request.user, question_paper=q_paper)
+    paper = AnswerPaper.objects.get(user=request.user, attempt_number=attempt_no,
+            question_paper=q_paper)
     if not user.is_authenticated() or paper.end_time < datetime.datetime.now():
         return my_redirect('/exam/login/')
     question = get_object_or_404(Question, pk=q_id)
@@ -737,7 +753,7 @@ def check(request, q_id, questionpaper_id=None):
     success = True
     if skip is not None:
         next_q = paper.skip()
-        return show_question(request, next_q, questionpaper_id)
+        return show_question(request, next_q, attempt_no, questionpaper_id)
 
     # Add the answer submitted, regardless of it being correct or not.
     if question.type == 'mcq':
@@ -770,10 +786,10 @@ def check(request, q_id, questionpaper_id=None):
     if not success:  # Should only happen for non-mcq questions.
         if time_left == 0:
             reason = 'Your time is up!'
-            return complete(request, reason, questionpaper_id)
+            return complete(request, reason, attempt_no, questionpaper_id)
         if not paper.question_paper.quiz.active:
             reason = 'The quiz has been deactivated!'
-            return complete(request, reason, questionpaper_id)
+            return complete(request, reason, attempt_no, questionpaper_id)
         context = {'question': question, 'error_message': err_msg,
                    'paper': paper, 'last_attempt': user_code,
                    'quiz_name': paper.question_paper.quiz.description,
@@ -785,10 +801,10 @@ def check(request, q_id, questionpaper_id=None):
     else:
         if time_left <= 0:
             reason = 'Your time is up!'
-            return complete(request, reason, questionpaper_id)
+            return complete(request, reason, attempt_no, questionpaper_id)
         else:
             next_q = paper.completed_question(question.id)
-            return show_question(request, next_q,
+            return show_question(request, next_q, attempt_no,
                                  questionpaper_id, success_msg)
 
 
@@ -824,14 +840,15 @@ def validate_answer(user, user_answer, question):
     return correct, success, message
 
 
-def quit(request, questionpaper_id=None):
+def quit(request, attempt_no=None, questionpaper_id=None):
     """Show the quit page when the user logs out."""
-    context = {'id': questionpaper_id}
+    context = {'id': questionpaper_id,
+               'attempt_no': attempt_no}
     return my_render_to_response('exam/quit.html', context,
                                  context_instance=RequestContext(request))
 
 
-def complete(request, reason=None, questionpaper_id=None):
+def complete(request, reason=None, attempt_no=None, questionpaper_id=None):
     """Show a page to inform user that the quiz has been compeleted."""
 
     user = request.user
@@ -842,11 +859,13 @@ def complete(request, reason=None, questionpaper_id=None):
         return my_render_to_response('exam/complete.html', context)
     else:
         q_paper = QuestionPaper.objects.get(id=questionpaper_id)
-        paper = AnswerPaper.objects.get(user=user, question_paper=q_paper)
+        paper = AnswerPaper.objects.get(user=user, question_paper=q_paper,
+                attempt_number=attempt_no)
         paper.update_marks_obtained()
         paper.update_percent()
         paper.update_passed()
         paper.end_time = datetime.datetime.now()
+        paper.update_status()
         paper.save()
         obt_marks = paper.marks_obtained
         tot_marks = paper.question_paper.total_marks