# -*- coding: utf-8 -*-
''' Django Notifications exemple views '''
from distutils.version import StrictVersion  # pylint: disable=no-name-in-module,import-error

from django import get_version
from django.contrib.auth.decorators import login_required
from django.forms import model_to_dict
from django.shortcuts import get_object_or_404, redirect
from django.utils.decorators import method_decorator
from django.views.generic import ListView
from notifications import settings
from notifications.models import Notification
from notifications.utils import id2slug, slug2id

if StrictVersion(get_version()) >= StrictVersion('1.7.0'):
    from django.http import JsonResponse  # noqa
else:
    # Django 1.6 doesn't have a proper JsonResponse
    import json
    from django.http import HttpResponse  # noqa

    def date_handler(obj):
        return obj.isoformat() if hasattr(obj, 'isoformat') else obj

    def JsonResponse(data):  # noqa
        return HttpResponse(
            json.dumps(data, default=date_handler),
            content_type="application/json")


class NotificationViewList(ListView):
    template_name = 'notifications/list.html'
    context_object_name = 'notifications'
    paginate_by = settings.get_config()['PAGINATE_BY']

    @method_decorator(login_required)
    def dispatch(self, request, *args, **kwargs):
        return super(NotificationViewList, self).dispatch(
            request, *args, **kwargs)


class AllNotificationsList(NotificationViewList):
    """
    Index page for authenticated user
    """

    def get_queryset(self):
        if settings.get_config()['SOFT_DELETE']:
            qset = self.request.user.notifications.active()
        else:
            qset = self.request.user.notifications.all()
        return qset


class UnreadNotificationsList(NotificationViewList):

    def get_queryset(self):
        return self.request.user.notifications.unread()


@login_required
def mark_all_as_read(request):
    request.user.notifications.mark_all_as_read()

    _next = request.GET.get('next')

    if _next:
        return redirect(_next)
    return redirect('notifications:unread')


@login_required
def mark_as_read(request, slug=None):
    notification_id = slug2id(slug)

    notification = get_object_or_404(
        Notification, recipient=request.user, id=notification_id)
    notification.mark_as_read()

    _next = request.GET.get('next')

    if _next:
        return redirect(_next)

    return redirect('notifications:unread')


@login_required
def mark_as_unread(request, slug=None):
    notification_id = slug2id(slug)

    notification = get_object_or_404(
        Notification, recipient=request.user, id=notification_id)
    notification.mark_as_unread()

    _next = request.GET.get('next')

    if _next:
        return redirect(_next)

    return redirect('notifications:unread')


@login_required
def delete(request, slug=None):
    notification_id = slug2id(slug)

    notification = get_object_or_404(
        Notification, recipient=request.user, id=notification_id)

    if settings.get_config()['SOFT_DELETE']:
        notification.deleted = True
        notification.save()
    else:
        notification.delete()

    _next = request.GET.get('next')

    if _next:
        return redirect(_next)

    return redirect('notifications:all')


def live_unread_notification_count(request):
    try:
        user_is_authenticated = request.user.is_authenticated()
    except TypeError:  # Django >= 1.11
        user_is_authenticated = request.user.is_authenticated

    if not user_is_authenticated:
        data = {
            'unread_count': 0
        }
    else:
        data = {
            'unread_count': request.user.notifications.unread().count(),
        }
    return JsonResponse(data)


def live_unread_notification_list(request):
    ''' Return a json with a unread notification list '''
    try:
        user_is_authenticated = request.user.is_authenticated()
    except TypeError:  # Django >= 1.11
        user_is_authenticated = request.user.is_authenticated

    if not user_is_authenticated:
        data = {
            'unread_count': 0,
            'unread_list': []
        }
        return JsonResponse(data)

    try:
        # If they don't specify, make it 5.
        num_to_fetch = request.GET.get('max', 5)
        num_to_fetch = int(num_to_fetch)
        # if num_to_fetch is negative, force at least one fetched notifications
        num_to_fetch = max(1, num_to_fetch)
        # put a sane ceiling on the number retrievable
        num_to_fetch = min(num_to_fetch, 100)
    except ValueError:
        num_to_fetch = 5  # If casting to an int fails, just make it 5.

    unread_list = []

    for notification in request.user.notifications.unread()[0:num_to_fetch]:
        struct = model_to_dict(notification)
        struct['slug'] = id2slug(notification.id)
        if notification.actor:
            struct['actor'] = str(notification.actor)
        if notification.target:
            struct['target'] = str(notification.target)
        if notification.action_object:
            struct['action_object'] = str(notification.action_object)
        if notification.data:
            struct['data'] = notification.data
        unread_list.append(struct)
        if request.GET.get('mark_as_read'):
            notification.mark_as_read()
    data = {
        'unread_count': request.user.notifications.unread().count(),
        'unread_list': unread_list
    }
    return JsonResponse(data)