# -*- coding: utf-8 -*-

import smtplib

from django import http
from django.conf import settings
from django.contrib import messages
from django.db import IntegrityError
from django.views.generic import View
from django.core.paginator import Paginator
from django.utils.translation import ugettext as _
from django.core.exceptions import ObjectDoesNotExist
from django.utils.decorators import method_decorator
from django.contrib.auth.decorators import login_required
from django.shortcuts import render, redirect

from . import queries
from .decorators import count_hit
from .utils.email import send_verification_email
from .models import MailingList, Thread, EmailAddress, EmailAddressValidation


@count_hit
def thread(request, mailinglist, thread_token):

    try:
        first_message = queries.get_first_message_in_thread(mailinglist,
                                                            thread_token)
    except ObjectDoesNotExist:
        raise http.Http404
    order_by = request.GET.get('order')
    if order_by == 'voted':
        msgs_query = queries.get_messages_by_voted()
    else:
        msgs_query = queries.get_messages_by_date()

    msgs_query = msgs_query.filter(thread__subject_token=thread_token)
    msgs_query = msgs_query.filter(thread__mailinglist__name=mailinglist)
    emails = msgs_query.exclude(id=first_message.id)

    total_votes = first_message.votes_count()
    for email in emails:
        total_votes += email.votes_count()

    # Update relevance score
    thread = Thread.objects.get(subject_token=thread_token,
                                mailinglist__name=mailinglist)
    thread.update_score()

    context = {
        'first_msg': first_message,
        'emails': [first_message] + list(emails),
        'pagehits': queries.get_page_hits(request.path_info),
        'total_votes': total_votes,
        'thread': thread,
    }

    return render(request, 'message-thread.html', context)


def list_messages(request):

    selected_list = request.GET.get('list')

    order_by = request.GET.get('order')
    if order_by == 'hottest':
        threads = queries.get_hottest_threads()
    else:
        threads = queries.get_latest_threads()

    mail_list = request.GET.get('list')
    if mail_list:
        threads = threads.filter(mailinglist__name=mail_list)

    paginator = Paginator(threads, 16)
    try:
        page = int(request.GET.get('p', '1'))
    except ValueError:
        page = 1
    threads = paginator.page(page)

    lists = MailingList.objects.all()

    template_data = {
        'lists': lists,
        'n_results': paginator.count,
        'threads': threads,
        'selected_list': selected_list,
        'order_data': settings.ORDERING_DATA,
    }
    return render(request, 'message-list.html', template_data)


class EmailView(View):

    http_method_names = [u'head', u'get', u'post', u'delete', u'update']

    def get(self, request, key):
        """Validate an email with the given key"""

        try:
            email_val = EmailAddressValidation.objects.get(validation_key=key,
                                                           user__pk=request.user.pk)
        except EmailAddressValidation.DoesNotExist:
            messages.error(request, _('The email address you are trying to '
                                      'verify either has already been verified '
                                      'or does not exist.'))
            return redirect('/')

        try:
            email = EmailAddress.objects.get(address=email_val.address)
        except EmailAddress.DoesNotExist:
            email = EmailAddress(address=email_val.address)

        if email.user:
            messages.error(request, _('The email address you are trying to '
                                      'verify is already an active email '
                                      'address.'))
            email_val.delete()
            return redirect('/')

        email.user = email_val.user
        email.save()
        email_val.delete()

        messages.success(request, _('Email address verified!'))
        return redirect('user_profile', username=email_val.user.username)


    @method_decorator(login_required)
    def post(self, request, key):
        """Create new email address that will wait for validation"""

        email = request.POST.get('email')
        if not email:
            return http.HttpResponseBadRequest()

        try:
            EmailAddressValidation.objects.create(address=email,
                                                  user=request.user)
        except IntegrityError:
            # 409 Conflict
            #   duplicated entries
            #   email exist and it's waiting for validation
            return http.HttpResponse(status=409)

        return http.HttpResponse(status=201)

    @method_decorator(login_required)
    def delete(self, request, key):
        """Remove an email address, validated or not."""

        request.DELETE = http.QueryDict(request.body)
        email_addr = request.DELETE.get('email')

        if not email_addr:
            return http.HttpResponseBadRequest()

        try:
            email = EmailAddressValidation.objects.get(address=email_addr,
                                                       user=request.user)
        except EmailAddressValidation.DoesNotExist:
            pass
        else:
            email.delete()
            return http.HttpResponse(status=204)

        try:
            email = EmailAddress.objects.get(address=email_addr,
                                             user=request.user)
        except EmailAddress.DoesNotExist:
            raise http.Http404

        email.user = None
        email.save()
        return http.HttpResponse(status=204)

    @method_decorator(login_required)
    def update(self, request, key):
        """Set an email address as primary address."""

        request.UPDATE = http.QueryDict(request.body)

        email_addr = request.UPDATE.get('email')
        if not email_addr:
            return http.HttpResponseBadRequest()

        try:
            email = EmailAddress.objects.get(address=email_addr,
                                             user=request.user)
        except EmailAddress.DoesNotExist:
            raise http.Http404

        request.user.email = email_addr
        request.user.save()
        return http.HttpResponse(status=204)


class EmailValidationView(View):

    http_method_names = [u'post']

    def post(self, request):
        email_addr = request.POST.get('email')
        try:
            email = EmailAddressValidation.objects.get(address=email_addr,
                                                       user=request.user)
        except http.DoesNotExist:
            raise http.Http404

        try:
            send_verification_email(email_addr, request.user,
                                    email.validation_key)
        except smtplib.SMTPException:
            return http.HttpResponseServerError()

        return http.HttpResponse(status=204)