from django.shortcuts import render
from django.urls import reverse

from boards.abstracts.constants import PARAM_PAGE
from boards.abstracts.paginator import get_paginator
from boards.abstracts.settingsmanager import get_settings_manager, \
    SETTING_LAST_NOTIFICATION_ID
from boards.models.user import Notification
from boards.views.base import BaseBoardView
from boards.views.mixins import PaginatedMixin

DEFAULT_PAGE = '1'

TEMPLATE = 'boards/notifications.html'
PARAM_USERNAMES = 'notification_usernames'
RESULTS_PER_PAGE = 10


class NotificationView(BaseBoardView, PaginatedMixin):

    def get(self, request, username=None):
        params = self.get_context_data()

        settings_manager = get_settings_manager(request)

        # If we open our notifications, reset the "new" count
        if username is None:
            notification_usernames = settings_manager.get_notification_usernames()
        else:
            notification_usernames = [username]

        posts = Notification.objects.get_notification_posts(
                usernames=notification_usernames, user_settings=settings_manager.get_user_settings())

        if username is None:
            last = posts.first()
            if last is not None:
                last_id = last.id
                settings_manager.set_setting(SETTING_LAST_NOTIFICATION_ID,
                                             last_id)

        page = int(request.GET.get(PARAM_PAGE, DEFAULT_PAGE))
        paginator = get_paginator(posts, RESULTS_PER_PAGE,
                                  link=reverse('notifications'),
                                  params=request.GET.dict())

        params[PARAM_PAGE] = paginator.page(page)
        params[PARAM_USERNAMES] = notification_usernames
        params.update(self.get_page_context(paginator, page))

        return render(request, TEMPLATE, params)