from .forms import CourseForm, UpdateCourseForm, CategoryCourseForm, SubjectForm,TopicForm,ActivityForm
from .models import Course, Subject, CourseCategory, Topic, SubjectCategory, Activity, CategorySubject
from core.decorators import log_decorator
from core.mixins import LogMixin, NotificationMixin
from core.models import Log
from courses.models import Material
from datetime import date, datetime
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.contrib.auth.mixins import LoginRequiredMixin
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
from django.core.urlresolvers import reverse_lazy
from django.db.models import Q
from django.http import JsonResponse
from django.shortcuts import get_object_or_404
from django.urls import reverse
from django.utils.translation import ugettext_lazy as _
from django.views import generic
from exercise.models import Exercise
from files.forms import FileForm
from files.models import TopicFile
from functools import reduce
from rolepermissions.mixins import HasRoleMixin
from rolepermissions.verifications import has_object_permission
from rolepermissions.verifications import has_role
from users.models import User
import operator
import time

#API IMPORTS
from rest_framework import viewsets, permissions
from .serializers import *

class Category:
    name = None
    slug = None
    course_category = []

def course_category(list_courses):

    list_courses = list_courses.distinct().order_by('category','name')
    categorys_courses = []
    cat_slug = None
    cat = None
    for course in list_courses:
        if (course.category.slug != cat_slug):
            if (cat != None):
                categorys_courses.append(cat)
            cat_slug = course.category.slug
            cat = Category()
            cat.name = course.category.name
            cat.slug = cat_slug
            cat.course_category = []
        cat.course_category.append(course)

    if (cat):
        categorys_courses.append(cat)

    return sorted(list(categorys_courses),key = lambda x:x.name)

class IndexView(LoginRequiredMixin, NotificationMixin, generic.ListView):

    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    queryset = Course.objects.all()
    template_name = 'course/index.html'
    context_object_name = 'courses'


    def get_queryset(self):
        result = super(IndexView, self).get_queryset()

        course_search = self.request.GET.get('q', None)
        category_search = self.request.GET.get('category', None)
        if course_search:
            query_list = course_search.split()
            result = result.filter(
            reduce(operator.and_,
                (Q(name__icontains=q) for q in query_list))
            )
        if category_search:
            query_list = category_search.split()
            result = result.filter(
            reduce(operator.and_,
                (Q(category__name=category) for category in query_list))
            )
        return result

    def get_context_data(self, **kwargs):
        context = super(IndexView, self).get_context_data(**kwargs)
        list_courses = None
        if has_role(self.request.user,'system_admin'):
            list_courses = self.get_queryset().order_by('name')
            # categorys_courses = CourseCategory.objects.all()
        elif has_role(self.request.user,'professor'):
            list_courses = self.get_queryset().filter(professors__in = [self.request.user]).order_by('name')
            # categorys_courses = CourseCategory.objects.filter(course_category__professors__name = self.request.user.name).distinct()
        elif has_role(self.request.user, 'student'):
            list_courses = self.get_queryset().filter(students__in = [self.request.user]).order_by('name')

        context['categorys_courses'] = course_category(list_courses)
        return context

class AllCoursesView(LoginRequiredMixin, NotificationMixin, generic.ListView):

    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'course/index.html'
    context_object_name = 'courses'


    def get_queryset(self):
        result = Course.objects.all()

        course_search = self.request.GET.get('q', None)
        category_search = self.request.GET.get('category', None)
        if course_search:
            # self.aparece = False
            query_list = course_search.split()
            result = result.filter(
            reduce(operator.and_,
                (Q(name__icontains=q) for q in query_list))
            )
        if category_search:
            # self.aparece = False
            query_list = category_search.split()
            result = result.filter(
            reduce(operator.and_,
                (Q(category__name=category) for category in query_list))
            )
        return result

    def get_context_data(self, **kwargs):
        context = super(AllCoursesView, self).get_context_data(**kwargs)

        list_courses = self.get_queryset()

        context['categorys_courses'] = course_category(list_courses)

        return context

class CreateCourseView(LoginRequiredMixin, HasRoleMixin, LogMixin, NotificationMixin, generic.edit.CreateView):
    log_component = "course"
    log_resource = "course"
    log_action = "create"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'course/create.html'
    form_class = CourseForm
    success_url = reverse_lazy('course:manage')

    def form_valid(self, form):
        self.object = form.save()
        self.object.professors.add(self.request.user)

        self.log_context['course_id'] = self.object.id
        self.log_context['course_name'] = self.object.name
        self.log_context['course_slug'] = self.object.slug
        self.log_context['course_category_id'] = self.object.category.id
        self.log_context['course_category_name'] = self.object.category.name

        super(CreateCourseView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return super(CreateCourseView, self).form_valid(form)

    def get_context_data(self, **kwargs):
        context = super(CreateCourseView, self).get_context_data(**kwargs)
        if has_role(self.request.user,'system_admin'):
            courses = Course.objects.all()
        elif has_role(self.request.user,'professor'):
            courses = self.request.user.courses_student.all()
        context['courses'] = courses
        context['title'] = _("Create Course")
        context['now'] = date.today()
        return context

class ReplicateCourseView(LoginRequiredMixin, HasRoleMixin, LogMixin, NotificationMixin,generic.edit.CreateView):
    log_component = "courses"
    log_action = "replicate"
    log_resource = "course"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'course/replicate.html'
    form_class = CourseForm
    success_url = reverse_lazy('course:manage')

    def form_valid(self, form):
        self.object = form.save()
        self.object.professors.add(self.request.user)
        return super(ReplicateCourseView, self).form_valid(form)

    def get_context_data(self, **kwargs):
        context = super(ReplicateCourseView, self).get_context_data(**kwargs)
        course = get_object_or_404(Course, slug = self.kwargs.get('slug'))
        if has_role(self.request.user,'system_admin'):
            courses = Course.objects.all()
        elif has_role(self.request.user,'professor'):
            courses = self.request.user.courses_professors.all()
        categorys_courses = CourseCategory.objects.all()

        self.log_context['course_id'] = course.id
        self.log_context['course_name'] = course.name
        self.log_context['course_slug'] = course.slug
        self.log_context['course_category_id'] = course.category.id
        self.log_context['course_category_name'] = course.category.name

        super(ReplicateCourseView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        context['courses'] = courses
        context['course'] = course
        context['categorys_courses'] = categorys_courses
        context['title'] = _("Replicate Course")
        context['now'] = date.today()
        print (course.public)
        return context

    def get_success_url(self):
        return reverse_lazy('course:view', kwargs={'slug' : self.object.slug})

class UpdateCourseView(LoginRequiredMixin, HasRoleMixin, LogMixin, generic.UpdateView):
    log_component = "courses"
    log_action = "update"
    log_resource = "course"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'course/update.html'
    model = Course
    form_class = UpdateCourseForm

    def dispatch(self, *args, **kwargs):
        course = get_object_or_404(Course, slug = self.kwargs.get('slug'))
        if(not has_object_permission('update_course', self.request.user, course)):
            return self.handle_no_permission()
        return super(UpdateCourseView, self).dispatch(*args, **kwargs)

    def form_valid(self, form):
        self.object = form.save()

        print (form)
        self.log_context['course_id'] = self.object.id
        self.log_context['course_name'] = self.object.name
        self.log_context['course_slug'] = self.object.slug
        self.log_context['course_category_id'] = self.object.category.id
        self.log_context['course_category_name'] = self.object.category.name

        super(UpdateCourseView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return super(UpdateCourseView, self).form_valid(form)

    def get_context_data(self, **kwargs):
        context = super(UpdateCourseView, self).get_context_data(**kwargs)
        course = get_object_or_404(Course, slug = self.kwargs.get('slug'))
        print (course.public)
        if has_role(self.request.user,'system_admin'):
            courses = Course.objects.all()
        elif has_role(self.request.user,'professor'):
            courses = self.request.user.courses_professors.all()
        context['courses'] = courses
        context['title'] = course.name
        context['now'] = date.today()
        return context

    def get_success_url(self):
        return reverse_lazy('course:view', kwargs={'slug' : self.object.slug})

class DeleteCourseView(LoginRequiredMixin, HasRoleMixin, LogMixin, generic.DeleteView):
    log_component = "courses"
    log_action = "delete"
    log_resource = "course"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    model = Course
    template_name = 'course/delete.html'

    def dispatch(self, *args, **kwargs):
        course = get_object_or_404(Course, slug = self.kwargs.get('slug'))
        if(not has_object_permission('delete_course', self.request.user, course)):
            return self.handle_no_permission()

        return super(DeleteCourseView, self).dispatch(*args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super(DeleteCourseView, self).get_context_data(**kwargs)
        course = get_object_or_404(Course, slug = self.kwargs.get('slug'))

        if has_role(self.request.user,'system_admin'):
            courses = Course.objects.all()
        elif has_role(self.request.user,'professor'):
            courses = self.request.user.courses_professors.all()
        context['courses'] = courses
        context['title'] = course.name

        return context

    def get_success_url(self):
        self.log_context['course_id'] = self.object.id
        self.log_context['course_name'] = self.object.name
        self.log_context['course_slug'] = self.object.slug
        self.log_context['course_category_id'] = self.object.category.id
        self.log_context['course_category_name'] = self.object.category.name

        super(DeleteCourseView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return reverse_lazy('course:manage')


class CourseView(LogMixin, NotificationMixin, generic.DetailView):
    log_component = "courses"
    log_action = "viewed"
    log_resource = "course"
    log_context = {}

    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    model = Course
    context_object_name = 'course'
    template_name = 'course/view.html'

    def get_context_data(self, **kwargs):
        subjects = None
        courses = None
        context = super(CourseView, self).get_context_data(**kwargs)
        course = get_object_or_404(Course, slug = self.kwargs.get('slug'))

        self.log_context['course_id'] = course.id
        self.log_context['course_name'] = course.name
        self.log_context['course_slug'] = course.slug
        self.log_context['course_category_id'] = course.category.id
        self.log_context['course_category_name'] = course.category.name
        self.log_context['timestamp_start'] = str(int(time.time()))

        super(CourseView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        self.request.session['log_id'] = Log.objects.latest('id').id

        category_sub = self.kwargs.get('category', None)

        if has_role(self.request.user,'system_admin'):
            subjects = course.subjects.all()
        elif has_role(self.request.user,'professor'):
            subjects = course.subjects.filter(professors__in=[self.request.user])
        elif has_role(self.request.user, 'student') or self.request.user is None:
            subjects = course.subjects.filter(visible=True)

        if not category_sub is None:
            cat = get_object_or_404(CategorySubject, slug = category_sub)
            subjects = subjects.filter(category = cat)

        context['subjects'] = subjects

        if has_role(self.request.user,'system_admin'):
            courses = Course.objects.all()
        elif has_role(self.request.user,'professor'):
            courses = self.request.user.courses_professors.all()
        elif has_role(self.request.user, 'student'):
            courses = self.request.user.courses_student.all()
        else:
            courses = Course.objects.filter(public = True)

        categorys_subjects = None
        if has_role(self.request.user,'professor') or has_role(self.request.user,'system_admin'):
            categorys_subjects = CategorySubject.objects.filter(subject_category__professors__name = self.request.user.name).distinct()
        elif has_role(self.request.user, 'student'):
            categorys_subjects = CategorySubject.objects.filter(subject_category__students__name = self.request.user.name).distinct()
        else:
            categorys_subjects = CategorySubject.objects.all().distinct()

        subjects_category = Subject.objects.filter(category__name = self.request.GET.get('category'))

        context['category'] = category_sub
        context['categorys_subjects'] = categorys_subjects
        context['courses'] = courses
        context['course'] = course
        context['title'] = course.name

        return context

class DeleteTopic(LoginRequiredMixin, HasRoleMixin, NotificationMixin, generic.DeleteView):

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    model = Topic
    template_name = 'course/delete.html'
    success_url = reverse_lazy('course:manage')

    def render_to_response(self, context, **response_kwargs):
        messages.success(self.request, _('Course deleted successfully!'))

        return self.response_class(request=self.request, template=self.get_template_names(), context=context, using=self.template_engine)


@login_required
@log_decorator("course", "subscribe", "course")
def subscribe_course(request, slug):
    course = get_object_or_404(Course, slug = slug)

    course.students.add(request.user)

    if request.user in course.students.all():

        log_context = {}
        log_context['course_id'] = course.id
        log_context['course_name'] = course.name
        log_context['course_slug'] = course.slug
        log_context['course_category_id'] = course.category.id
        log_context['course_category_name'] = course.category.name

        request.log_context = log_context

        return JsonResponse({"status": "ok", "message": _("Successfully subscribed to the course!")})
    else:
        return JsonResponse({"status": "erro", "message": _("An error has occured. Could not subscribe to this course, try again later")})

class FilteredView(LoginRequiredMixin, generic.ListView):

    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'course/filtered.html'
    context_object_name = 'courses'
    paginate_by = 10

    def get_queryset(self):
        category = get_object_or_404(CourseCategory, slug = self.kwargs.get('slug'))
        return Course.objects.filter(category = category)

    def get_context_data(self, **kwargs):
        category = get_object_or_404(CourseCategory, slug = self.kwargs.get('slug'))
        context = super(FilteredView, self).get_context_data(**kwargs)
        context['categories'] = CourseCategory.objects.all()
        context['cat'] = category

        return context

class IndexCatView(LoginRequiredMixin, generic.ListView):

    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    queryset = CourseCategory.objects.all().order_by("name")
    template_name = 'category/index.html'
    context_object_name = 'categories'
    paginate_by = 10

class CreateCatView(LoginRequiredMixin, HasRoleMixin, generic.edit.CreateView):

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'category/create.html'
    form_class = CategoryCourseForm
    success_url = reverse_lazy('course:manage_cat')

    def get_success_url(self):
        objeto = self.object.name
        messages.success(self.request, _('Category "%s" created successfully!')%(objeto))
        return reverse_lazy('course:manage_cat')

class UpdateCatView(LoginRequiredMixin, HasRoleMixin, generic.UpdateView):

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'category/update.html'
    model = CourseCategory
    form_class = CategoryCourseForm
    success_url = reverse_lazy('course:manage_cat')

    def get_success_url(self):
        objeto = self.object.name
        messages.success(self.request, _('Category "%s" updated successfully!')%(objeto))
        #return reverse_lazy('course:update_cat', kwargs={'slug' : self.object.slug})
        return reverse_lazy('course:manage_cat')
class DeleteCatView(LoginRequiredMixin, HasRoleMixin, generic.DeleteView):

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    model = CourseCategory
    template_name = 'category/delete.html'

    def dispatch(self, *args, **kwargs):
        category = get_object_or_404(CourseCategory, slug = self.kwargs.get('slug'))
        if(not has_object_permission('delete_category', self.request.user, category)):
            return self.handle_no_permission()
        return super(DeleteCatView, self).dispatch(*args, **kwargs)


    def get_context_data(self, **kwargs):
        context = super(DeleteCatView, self).get_context_data(**kwargs)
        context['course'] = self.object.course_category
        context['category'] = self.object
        return context

    def get_success_url(self):
        messages.success(self.request, _('Category deleted successfully!'))
        return reverse_lazy('course:manage_cat')

class SubjectsView(LoginRequiredMixin, LogMixin, generic.ListView):
    log_component = "course"
    log_resource = "subject"
    log_action = "viewed"
    log_context = {}

    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'subject/index.html'
    context_object_name = 'subjects'
    model = Subject

    def dispatch(self, *args, **kwargs):
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))

        if(not has_object_permission('view_subject', self.request.user, subject)):
            return self.handle_no_permission()

        self.log_context['subject_id'] = subject.id
        self.log_context['subject_name'] = subject.name
        self.log_context['subject_slug'] = subject.slug
        self.log_context['course_id'] = subject.course.id
        self.log_context['course_name'] = subject.course.name
        self.log_context['course_slug'] = subject.course.slug
        self.log_context['course_category_id'] = subject.course.category.id
        self.log_context['course_category_name'] = subject.course.category.name
        self.log_context['timestamp_start'] = str(int(time.time()))

        super(SubjectsView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        self.request.session['log_id'] = Log.objects.latest('id').id

        return super(SubjectsView, self).dispatch(*args, **kwargs)

    def get_queryset(self):
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
        course = subject.course
        context = course.subjects.filter(visible=True)
        if (self.request.user in subject.professors.all() or has_role(self.request.user,'system_admin')):
            context = course.subjects.all()
        return context

    def get_context_data(self, **kwargs):
        context = super(SubjectsView, self).get_context_data(**kwargs)
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
        context['course'] = subject.course
        context['subject'] = subject
        context['topics'] = Topic.objects.filter(subject = subject)
        context['exercise'] = Exercise.objects.filter(topic__subject=subject)
        if has_role(self.request.user,'professor') or has_role(self.request.user,'system_admin'):
            context['files'] = TopicFile.objects.filter(professor__name = self.request.user.name)
        else:
            context['files'] = TopicFile.objects.filter(students__name = self.request.user.name)
        return context


class UploadMaterialView(LoginRequiredMixin, generic.edit.CreateView):
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'

    template_name = 'files/create_file.html'
    form_class = FileForm

    def form_invalid(self, form):
        context = super(UploadMaterialView, self).form_invalid(form)
        context.status_code = 400

        return context

    def get_success_url(self):
        self.success_url = reverse('course:view_subject', args = (self.object.slug, ))

        return self.success_url

class TopicsView(LoginRequiredMixin, LogMixin, generic.ListView):
    log_component = "course"
    log_resource = "topic"
    log_action = "viewed"
    log_context = {}

    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'topic/index.html'
    context_object_name = 'topics'
    model = Topic

    def dispatch(self, *args, **kwargs):
        topic = get_object_or_404(Topic, slug = self.kwargs.get('slug'))

        if(not has_object_permission('view_topic', self.request.user, topic)):
            return self.handle_no_permission()

        self.log_context['topic_id'] = topic.id
        self.log_context['topic_name'] = topic.name
        self.log_context['topic_slug'] = topic.slug
        self.log_context['subject_id'] = topic.subject.id
        self.log_context['subject_name'] = topic.subject.name
        self.log_context['subject_slug'] = topic.subject.slug
        self.log_context['course_id'] = topic.subject.course.id
        self.log_context['course_name'] = topic.subject.course.name
        self.log_context['course_slug'] = topic.subject.course.slug
        self.log_context['course_category_id'] = topic.subject.course.category.id
        self.log_context['course_category_name'] = topic.subject.course.category.name
        self.log_context['timestamp_start'] = str(int(time.time()))

        super(TopicsView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        self.request.session['log_id'] = Log.objects.latest('id').id

        return super(TopicsView, self).dispatch(*args, **kwargs)

    def get_queryset(self):
        topic = get_object_or_404(Topic, slug = self.kwargs.get('slug'))
        subject = topic.subject
        topics_q = Topic.objects.filter(subject = subject, visible=True)

        return topics_q

    def get_context_data(self, **kwargs):
        topic = get_object_or_404(Topic, slug = self.kwargs.get('slug'))
        context = super(TopicsView, self).get_context_data(**kwargs)
        activitys = Activity.objects.filter(topic__name = topic.name)
        students_activit = User.objects.filter(activities__in = Activity.objects.all())
        materials = Material.objects.filter(topic = topic)
        
        users = User.objects.filter(subject_student__in = Subject.objects.all())
        context['users'] = users
        exercises = Exercise.objects.filter(Q(students=self.request.user)|Q(professors=self.request.user))
        context['exercises'] = exercises

        context['topic'] = topic
        context['subject'] = topic.subject
        context['activitys'] = activitys
        context['students_activit'] = students_activit
        context['materials'] = materials
        context['form'] = ActivityForm

        return context


class CreateTopicView(LoginRequiredMixin, HasRoleMixin, LogMixin, NotificationMixin, generic.edit.CreateView):
    log_component = "course"
    log_resource = "topic"
    log_action = "create"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'topic/create.html'
    form_class = TopicForm

    def get_success_url(self):
        return reverse_lazy('course:view_subject', kwargs={'slug' : self.object.subject.slug})

    def get_context_data(self, **kwargs):
        context = super(CreateTopicView, self).get_context_data(**kwargs)
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
        context['course'] = subject.course
        context['subject'] = subject
        context['subjects'] = subject.course.subjects.all()
        return context

    def form_valid(self, form):
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))

        self.object = form.save(commit = False)
        self.object.subject = subject
        self.object.owner = self.request.user
        self.object.save()
        action = super(CreateTopicView, self).createorRetrieveAction("create Topic")
        super(CreateTopicView, self).createNotification("Topic "+ self.object.name + " was created",
            resource_name=self.object.name, resource_link= reverse('course:view_topic',args=[self.object.slug]),
             actor=self.request.user, users = self.object.subject.course.students.all() )

        self.log_context['topic_id'] = self.object.id
        self.log_context['topic_name'] = self.object.name
        self.log_context['topic_slug'] = self.object.slug
        self.log_context['subject_id'] = self.object.subject.id
        self.log_context['subject_name'] = self.object.subject.name
        self.log_context['subject_slug'] = self.object.subject.slug
        self.log_context['course_id'] = self.object.subject.course.id
        self.log_context['course_name'] = self.object.subject.course.name
        self.log_context['course_slug'] = self.object.subject.course.slug
        self.log_context['course_category_id'] = self.object.subject.course.category.id
        self.log_context['course_category_name'] = self.object.subject.course.category.name

        super(CreateTopicView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return super(CreateTopicView, self).form_valid(form)

class UpdateTopicView(LoginRequiredMixin, HasRoleMixin, LogMixin, generic.UpdateView):
    log_component = "course"
    log_resource = "topic"
    log_action = "create"
    log_context = {}

    allowed_roles = ['professor','system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'topic/update.html'
    form_class = TopicForm

    def dispatch(self, *args, **kwargs):
        topic = get_object_or_404(Topic, slug = self.kwargs.get('slug'))
        if(not has_object_permission('edit_topic', self.request.user, topic)):
            return self.handle_no_permission()
        return super(UpdateTopicView, self).dispatch(*args, **kwargs)

    def get_object(self, queryset=None):
        return get_object_or_404(Topic, slug = self.kwargs.get('slug'))

    def get_success_url(self):
        return reverse_lazy('course:view_subject', kwargs={'slug' : self.object.subject.slug})

    def get_context_data(self, **kwargs):
        context = super(UpdateTopicView, self).get_context_data(**kwargs)
        topic = get_object_or_404(Topic, slug = self.kwargs.get('slug'))
        context['course'] = topic.subject.course
        context['subject'] = topic.subject
        context['subjects'] = topic.subject.course.subjects.filter(Q(visible=True) | Q(professors__in=[self.request.user]))
        if (has_role(self.request.user,'system_admin')):
            context['subjects'] = topic.subject.course.subjects.all()
        return context

    def form_valid(self, form):
        self.object = form.save()

        self.log_context['topic_id'] = self.object.id
        self.log_context['topic_name'] = self.object.name
        self.log_context['topic_slug'] = self.object.slug
        self.log_context['subject_id'] = self.object.subject.id
        self.log_context['subject_name'] = self.object.subject.name
        self.log_context['subject_slug'] = self.object.subject.slug
        self.log_context['course_id'] = self.object.subject.course.id
        self.log_context['course_name'] = self.object.subject.course.name
        self.log_context['course_slug'] = self.object.subject.course.slug
        self.log_context['course_category_id'] = self.object.subject.course.category.id
        self.log_context['course_category_name'] = self.object.subject.course.category.name

        super(UpdateTopicView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return super(UpdateTopicView, self).form_valid(form)

class CreateSubjectView(LoginRequiredMixin, HasRoleMixin, LogMixin, NotificationMixin, generic.edit.CreateView):
    log_component = "course"
    log_resource = "subject"
    log_action = "create"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'subject/create.html'
    form_class = SubjectForm

    def get_success_url(self):
        return reverse_lazy('course:view_subject', kwargs={'slug' : self.object.slug})

    def get_context_data(self, **kwargs):
        context = super(CreateSubjectView, self).get_context_data(**kwargs)
        course = get_object_or_404(Course, slug = self.kwargs.get('slug'))
        context['course'] = course
        context['subjects'] = course.subjects.filter(Q(visible=True) | Q(professors__in=[self.request.user]))
        if (has_role(self.request.user,'system_admin')):
            context['subjects'] = course.subjects.all()
        return context

    def form_valid(self, form):
        course = get_object_or_404(Course, slug = self.kwargs.get('slug'))

        self.object = form.save(commit = False)
        self.object.course = course
        self.object.save()
        self.object.professors.add(self.request.user)
        if self.object.visible:
            super(CreateSubjectView, self).createNotification( " created subject " + self.object.name, resource_name=self.object.name,
             resource_slug = self.object.slug, actor=self.request.user, users= self.object.course.students.all(),
             resource_link = reverse('course:view_subject', args=[self.object.slug]))

        self.log_context['subject_id'] = self.object.id
        self.log_context['subject_name'] = self.object.name
        self.log_context['subject_slug'] = self.object.slug
        self.log_context['course_id'] = course.id
        self.log_context['course_name'] = course.name
        self.log_context['course_slug'] = course.slug
        self.log_context['course_category_id'] = course.category.id
        self.log_context['course_category_name'] = course.category.name

        super(CreateSubjectView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return super(CreateSubjectView, self).form_valid(form)


class UpdateSubjectView(LoginRequiredMixin, HasRoleMixin, LogMixin, generic.UpdateView):
    log_component = "course"
    log_resource = "subject"
    log_action = "update"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'subject/update.html'
    form_class = SubjectForm

    def dispatch(self, *args, **kwargs):
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
        if(not has_object_permission('edit_subject', self.request.user, subject)):
            return self.handle_no_permission()
        return super(UpdateSubjectView, self).dispatch(*args, **kwargs)

    def form_valid(self, form):
        self.object = form.save()

        self.log_context['subject_id'] = self.object.id
        self.log_context['subject_name'] = self.object.name
        self.log_context['subject_slug'] = self.object.slug
        self.log_context['course_id'] = self.object.course.id
        self.log_context['course_name'] = self.object.course.name
        self.log_context['course_slug'] = self.object.course.slug
        self.log_context['course_category_id'] = self.object.course.category.id
        self.log_context['course_category_name'] = self.object.course.category.name

        super(UpdateSubjectView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return super(UpdateSubjectView, self).form_valid(form)

    def get_object(self, queryset=None):
        context = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
        return context

    def get_success_url(self):
        return reverse_lazy('course:view_subject', kwargs={'slug' : self.object.slug})

    def get_context_data(self, **kwargs):
        context = super(UpdateSubjectView, self).get_context_data(**kwargs)
        context['course'] = self.object.course
        context['subject'] = self.object
        context['subjects'] = self.object.course.subjects.filter(Q(visible=True) | Q(professors__in=[self.request.user]))
        if (has_role(self.request.user,'system_admin')):
            context['subjects'] = self.object.course.subjects.all()
        return context

class DeleteSubjectView(LoginRequiredMixin, HasRoleMixin, LogMixin, generic.DeleteView):
    log_component = "course"
    log_resource = "subject"
    log_action = "delete"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    model = Subject
    template_name = 'subject/delete.html'

    def dispatch(self, *args, **kwargs):
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
        if(not has_object_permission('delete_subject', self.request.user, subject)):
            return self.handle_no_permission()
        return super(DeleteSubjectView, self).dispatch(*args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super(DeleteSubjectView, self).get_context_data(**kwargs)
        context['course'] = self.object.course
        context['subject'] = self.object
        context['subjects'] = self.object.course.subjects.filter(Q(visible=True) | Q(professors__in=[self.request.user]))
        if (has_role(self.request.user,'system_admin')):
            context['subjects'] = self.object.course.subjects.all()
        return context

    def get_success_url(self):
        self.log_context['subject_id'] = self.object.id
        self.log_context['subject_name'] = self.object.name
        self.log_context['subject_slug'] = self.object.slug
        self.log_context['course_id'] = self.object.course.id
        self.log_context['course_name'] = self.object.course.name
        self.log_context['course_slug'] = self.object.course.slug
        self.log_context['course_category_id'] = self.object.course.category.id
        self.log_context['course_category_name'] = self.object.course.category.name

        super(DeleteSubjectView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return reverse_lazy('course:view', kwargs={'slug' : self.object.course.slug})

@login_required
@log_decorator("course", "subscribe", "subject")
def subscribe_subject(request, slug):
    subject = get_object_or_404(Subject, slug = slug)

    if request.user in subject.course.students.all():
        subject.students.add(request.user)

        if request.user in subject.students.all():
            log_context = {}
            log_context['subject_id'] = subject.id
            log_context['subject_name'] = subject.name
            log_context['subject_slug'] = subject.slug
            log_context['course_id'] = subject.course.id
            log_context['course_name'] = subject.course.name
            log_context['course_slug'] = subject.course.slug
            log_context['course_category_id'] = subject.course.category.id
            log_context['course_category_name'] = subject.course.category.name

            request.log_context = log_context

            return JsonResponse({"status": "ok", "message": _("Successfully subscribed to the subject!")})
        else:
            return JsonResponse({"status": "erro", "message": _("An error has occured. Could not subscribe to this subject, try again later")})
    else:
        return JsonResponse({"status": "erro", "message": _("You're not subscribed in the course yet.")})

class IndexSubjectCategoryView(LoginRequiredMixin, generic.ListView):
    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    model = SubjectCategory
    template_name = 'subject_category/index.html'
    paginate_by = 10

    def get_context_data(self, **kwargs):
        context = super(IndexSubjectCategoryView, self).get_context_data(**kwargs)
        context['subject_categories'] = SubjectCategory.objects.all()
        return context

class FileMaterialView(LoginRequiredMixin, LogMixin, generic.DetailView):
    log_component = 'file'
    log_resource = 'file'
    log_action = 'viewed'
    log_context = {}

    allowed_roles = ['professor', 'system_admin', 'student']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    model = Material
    context_object_name = 'file'
    template_name = 'topic/file_material_view.html'

    def dispatch(self, *args, **kwargs):
        file = get_object_or_404(TopicFile, slug = self.kwargs.get('slug'))

        self.log_context['file_id'] = file.id
        self.log_context['file_name'] = file.name
        self.log_context['topic_id'] = file.topic.id
        self.log_context['topic_name'] = file.topic.name
        self.log_context['topic_slug'] = file.topic.slug
        self.log_context['subject_id'] = file.topic.subject.id
        self.log_context['subject_name'] = file.topic.subject.name
        self.log_context['subject_slug'] = file.topic.subject.slug
        self.log_context['course_id'] = file.topic.subject.course.id
        self.log_context['course_name'] = file.topic.subject.course.name
        self.log_context['course_slug'] = file.topic.subject.course.slug
        self.log_context['course_category_id'] = file.topic.subject.course.category.id
        self.log_context['course_category_name'] = file.topic.subject.course.category.name
        self.log_context['timestamp_start'] = str(int(time.time()))

        super(FileMaterialView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        self.request.session['log_id'] = Log.objects.latest('id').id

        return super(FileMaterialView, self).dispatch(*args, **kwargs)


#API VIEWS
class CourseViewSet(viewsets.ModelViewSet):
    queryset = Course.objects.all()
    serializer_class = CourseSerializer
    permissions_class = (permissions.IsAuthenticatedOrReadOnly)

class SubjectViewSet(viewsets.ModelViewSet):
    queryset = Subject.objects.all()
    serializer_class = SubjectSerializer
    permissions_class = (permissions.IsAuthenticatedOrReadOnly)


class TopicViewSet(viewsets.ModelViewSet):
    queryset = Topic.objects.all()
    serializer_class = TopicSerializer
    permissions_class = (permissions.IsAuthenticatedOrReadOnly)

class ReplicateTopicView (LoginRequiredMixin, HasRoleMixin, LogMixin, NotificationMixin,generic.edit.CreateView):
    log_component = "course"
    log_resource = "topic"
    log_action = "replicate"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'topic/replicate.html'
    form_class = TopicForm

    def get_success_url(self):
        return reverse_lazy('course:view_subject', kwargs={'slug' : self.object.subject.slug})

    def get_context_data(self, **kwargs):
        context = super(ReplicateTopicView, self).get_context_data(**kwargs)
        topic = get_object_or_404(Topic, slug = self.kwargs.get('slug'))
        subject = Subject.objects.get(pk = topic.subject_id)
        context['course'] = subject.course
        context['subject'] = subject
        context['subjects'] = subject.course.subjects.all()
        context['topic'] = topic
        return context

    def form_valid(self, form):
        topic = get_object_or_404(Topic, slug = self.kwargs.get('slug'))
        subject = Subject.objects.get(pk = topic.subject_id)

        self.object = form.save(commit = False)
        self.object.topic = topic
        self.object.subject = subject
        self.object.owner = self.request.user
        self.object.save()
        action = super(ReplicateTopicView, self).createorRetrieveAction("create Topic")
        super(ReplicateTopicView, self).createNotification("Topic "+ self.object.name + " was created",
            resource_name=self.object.name, resource_link= reverse('course:view_topic',args=[self.object.slug]),
             actor=self.request.user, users = self.object.subject.course.students.all() )

        self.log_context['topic_id'] = self.object.id
        self.log_context['topic_name'] = self.object.name
        self.log_context['topic_slug'] = self.object.slug
        self.log_context['subject_id'] = self.object.subject.id
        self.log_context['subject_name'] = self.object.subject.name
        self.log_context['subject_slug'] = self.object.subject.slug
        self.log_context['course_id'] = self.object.subject.course.id
        self.log_context['course_name'] = self.object.subject.course.name
        self.log_context['course_slug'] = self.object.subject.course.slug
        self.log_context['course_category_id'] = self.object.subject.course.category.id
        self.log_context['course_category_name'] = self.object.subject.course.category.name

        super(ReplicateTopicView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return super(ReplicateTopicView, self).form_valid(form)

class ReplicateSubjectView(LoginRequiredMixin, HasRoleMixin, LogMixin, NotificationMixin, generic.edit.CreateView):
    log_component = "course"
    log_resource = "subject"
    log_action = "replicate"
    log_context = {}

    allowed_roles = ['professor', 'system_admin']
    login_url = reverse_lazy("core:home")
    redirect_field_name = 'next'
    template_name = 'subject/replicate.html'
    form_class = SubjectForm

    def get_success_url(self):
        return reverse_lazy('course:view_subject', kwargs={'slug' : self.object.slug})

    def get_context_data(self, **kwargs):
        context = super(ReplicateSubjectView, self).get_context_data(**kwargs)
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
        course = Course.objects.get(pk=subject.course_id)
        context['course'] = course
        context['subjects'] = course.subjects.filter(Q(visible=True) | Q(professors__in=[self.request.user]))
        context['subject'] = subject
        if (has_role(self.request.user,'system_admin')):
            context['subjects'] = course.subjects.all()
        return context

    def form_valid(self, form):
        subject = get_object_or_404(Subject, slug = self.kwargs.get('slug'))
        course = Course.objects.get(pk=subject.course_id)

        self.object = form.save(commit = False)
        self.object.course = course
        self.object.save()
        self.object.professors.add(self.request.user)
        if self.object.visible:
            super(ReplicateSubjectView, self).createNotification( " created subject " + self.object.name, resource_name=self.object.name,
             resource_slug = self.object.slug, actor=self.request.user, users= self.object.course.students.all(),
             resource_link = reverse('course:view_subject', args=[self.object.slug]))

        self.log_context['subject_id'] = self.object.id
        self.log_context['subject_name'] = self.object.name
        self.log_context['subject_slug'] = self.object.slug
        self.log_context['course_id'] = course.id
        self.log_context['course_name'] = course.name
        self.log_context['course_slug'] = course.slug
        self.log_context['course_category_id'] = course.category.id
        self.log_context['course_category_name'] = course.category.name

        super(ReplicateSubjectView, self).createLog(self.request.user, self.log_component, self.log_action, self.log_resource, self.log_context)

        return super(ReplicateSubjectView, self).form_valid(form)