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import logging 

import re 

 

from django.contrib import messages 

from django.contrib.auth.mixins import LoginRequiredMixin 

from django.core.exceptions import PermissionDenied 

from django.db import transaction 

from django.db.models import Avg 

from django.shortcuts import render, get_object_or_404, redirect 

from common.models import Fanfic as fanfic_model 

 

# Create your views here. 

from common.models import Review 

from common.utils import CustomError 

from common.views import BaseView 

 

# Get an instance of a logger 

from notifier.models import Notification 

 

logger = logging.getLogger(__name__) 

 

 

class ReviewView(LoginRequiredMixin, BaseView): 

""" Manage review """ 

 

def get(self, request, review_id=None): 

""" Get edit page for review """ 

if review_id is None: 

raise PermissionDenied() 

review = get_object_or_404(Review, id=review_id) 

fanfic = review.fanfic 

 

if review.user != request.user: 

# It's not the same user 

raise PermissionDenied() 

 

return render(request, 'review.html', context={ 

'fanfic': fanfic, 'text': review.text, 'stars': int(review.score), 

'edit': 'edit'}) 

 

def put(self, request, review_id=None): 

""" Update review """ 

if "review_id" is None: 

raise PermissionDenied() 

try: 

with transaction.atomic(): 

user = self.request.user 

review = get_object_or_404(Review, id=review_id) 

text = request.POST.get("text") 

stars = int(request.POST.get("stars")) 

 

if stars < 0 or stars > 5: 

raise PermissionDenied() 

 

if not text: 

# is empty, return error message 

raise CustomError("The text cannot be empty") 

else: 

pattern = re.compile(r'<[^>]+>') 

text_without_html = pattern.sub('', text) 

text_without_html = text_without_html.replace( 

"&nbsp;", "").replace(" ", "") 

if len(text_without_html) == 0: 

raise CustomError("The text cannot be empty") 

 

if len(text) > 7000: 

# text too long, return error message 

raise CustomError("The text is too long. It should be " 

"less than 7000 characters.") 

 

# update the review 

review.text = text 

review.score = stars 

review.save() 

 

# recalculate fanfic score 

fanfic_new_score = Review.objects.filter( 

fanfic=review.fanfic).aggregate(Avg( 

'score')) 

fanfic_new_score = round(fanfic_new_score['score__avg'], 2) 

fanfic = review.fanfic 

fanfic.average_score = fanfic_new_score 

fanfic.save() 

 

# redirect to the fanfic page 

logger.info("Review updated for user {}".format(user)) 

messages.success(request, "The review has been successfully " 

"updated.") 

return redirect('reviews:reviews', review_id=review_id) 

except CustomError as e: 

messages.error(request, e) 

logger.error("Error updating review {}".format(e)) 

return render(request, 'review.html', 

context={'text': text, 'fanfic': review.fanfic, 

'stars': int(review.score), 'edit': 'edit'}) 

except Exception as e: 

messages.error(request, 

"There was an unexpected error trying to\ 

update the review.") 

logger.error("Error updating review {}".format(e)) 

return render(request, 'review.html', 

context={'text': text, 'fanfic': review.fanfic, 

'stars': int(review.score), 'edit': 'edit'}) 

 

 

class ReviewsView(LoginRequiredMixin, BaseView): 

""" Manage reviews """ 

 

def get(self, request, review_id=None): 

""" See a review """ 

if review_id is None: 

raise PermissionDenied() 

review = get_object_or_404(Review, id=review_id) 

fanfic = review.fanfic 

 

return render(request, 'review.html', context={ 

'fanfic': fanfic, 'review': review}) 

 

def post(self, request): 

""" Create new review """ 

if "fanfic_id" not in request.POST: 

raise PermissionDenied() 

 

try: 

with transaction.atomic(): 

user = self.request.user 

fanfic_id = request.POST.get("fanfic_id") 

 

fanfic = get_object_or_404(fanfic_model, id=fanfic_id) 

 

text = request.POST.get("text") 

stars = int(request.POST.get("stars")) 

 

if stars < 0 or stars > 5: 

raise PermissionDenied() 

 

if Review.objects.filter(user=user, 

fanfic=fanfic).exists() is True: 

# this user already has a review, error msg 

raise CustomError("You already have " 

"posted a review for this fanfic.") 

 

if not text: 

# is empty, return error message 

raise CustomError("The text cannot be empty") 

else: 

pattern = re.compile(r'<[^>]+>') 

text_without_html = pattern.sub('', text) 

text_without_html = text_without_html.replace( 

"&nbsp;", "").replace(" ", "") 

if len(text_without_html) == 0: 

raise CustomError("The text cannot be empty") 

 

if len(text) > 7000: 

# text too long, return error message 

raise CustomError("The text is too long. It should be " 

"less than 7000 characters.") 

 

# create the review 

review = Review.objects.create(text=text, score=stars, 

fanfic=fanfic, 

user=user) 

 

# recalculate fanfic score 

fanfic_new_score = Review.objects.filter( 

fanfic=fanfic).aggregate(Avg( 

'score')) 

fanfic_new_score = round(fanfic_new_score['score__avg'], 2) 

fanfic.average_score = fanfic_new_score 

fanfic.save() 

 

# create notification 

Notification.objects.create( 

subject=fanfic, verb="has reviewed", target=user, 

link=review.get_url(), 

reverse=True, 

in_top_bar=False, in_feed=True) 

 

# redirect to the fanfic page 

logger.info("Review created for user {}".format(user)) 

messages.success(request, "The review has been successfully " 

"created.") 

return redirect('fanfics:fanfic', fanfic_id=fanfic_id) 

 

except CustomError as e: 

messages.error(request, e) 

logger.error("Error creating review {}".format(e)) 

if not fanfic: 

raise PermissionDenied() 

return render(request, 'review.html', 

context={'text': text, 'fanfic': fanfic, 

'stars': int(stars)}) 

except Exception as e: 

messages.error(request, 

"There was an unexpected error trying to\ 

save the review.") 

logger.error("Error creating review {}".format(e)) 

if not fanfic: 

raise PermissionDenied() 

return render(request, 'review.html', 

context={'text': text, 'fanfic': fanfic, 

'stars': int(review.score)}) 

 

def delete(self, request, review_id=None): 

""" Delete a review """ 

if review_id is None: 

raise PermissionDenied() 

 

try: 

with transaction.atomic(): 

review = get_object_or_404(Review, id=review_id) 

fanfic = review.fanfic 

if review.user != request.user: 

raise PermissionDenied() 

review.delete() 

 

messages.success(request, "The review has been successfully " 

"deleted") 

return redirect(fanfic.get_url()) 

except CustomError as e: 

messages.error(request, e) 

logger.error("Error deleting review {}".format(e)) 

return redirect('reviews:reviews', review_id=review_id) 

except Exception as e: 

messages.error(request, 

"There was an unexpected error trying to\ 

delete the review.") 

logger.error("Error deleting review {}".format(e)) 

return redirect('reviews:reviews', review_id=review_id)