# -*- coding: utf-8 -*-
import logging

from django.views.decorators.csrf import csrf_protect
from django.core.paginator import Paginator, InvalidPage
from django.shortcuts import render, redirect, get_object_or_404
from django.conf import settings

from project.teasers.models import get_teasers_for_path

from .models import Category, Entry
from .forms import EntryForm
from .emails import mail_entry


PAGINATE_BY = getattr(settings, 'GUESTBOOK_PAGINATE_BY', 25)

log = logging.getLogger('guestbook')


@csrf_protect
def index(request):
    form = None

    if request.method == 'POST':
        form = EntryForm(data=request.POST)

        if form.is_valid():
            entry = form.save()

            try:
                mail_entry(entry)  # уведомить по почте
            except Exception as e:
                log.exception(e)
            
            return redirect('guestbook-thanks')

    # если у записи не указана дата публикации, то учитывается дата создания
    list_qry = (Entry.objects.filter(published=True)
        .extra(select={'ordering_date': 'CASE WHEN pub_date IS NOT NULL THEN pub_date ELSE created_at END'})
        .order_by('-ordering_date')
    )

    paginator = Paginator(list_qry, PAGINATE_BY)

    try:
        page_num = int(request.GET.get('page', 1))
        page = paginator.page(page_num)
    except (ValueError, InvalidPage) as e:
        page_num = 1
        page = paginator.page(1)

    teasers = get_teasers_for_path(request.path + u'?page=%s' % page_num)
    
    return render(request, 'guestbook/object_list.html', {
        'paginator': paginator,
        'page': page,
        'form': form or EntryForm(),
        'teasers': teasers,
    })


def category_list(request, slug):
    """Вопросы-ответы внутри категории."""
    category = get_object_or_404(Category, slug__iexact=slug)

    # если у записи не указана дата публикации, то учитывается дата создания
    list_qry = (Entry.objects.filter(category=category, published=True)
        .extra(select={'ordering_date': 'CASE WHEN pub_date IS NOT NULL THEN pub_date ELSE created_at END'})
        .order_by('-ordering_date')
    )

    paginator = Paginator(list_qry, PAGINATE_BY)

    try:
        page_num = int(request.GET.get('page', 1))
        page = paginator.page(page_num)
    except (ValueError, InvalidPage) as e:
        page_num = 1
        page = paginator.page(1)

    teasers = get_teasers_for_path(request.path + u'?page=%s' % page_num)

    return render(request, 'guestbook/category_list.html', {
        'paginator': paginator,
        'page': page,
        'category': category,
        'teasers': teasers,
    })


def thanks(request):
    teasers = get_teasers_for_path(request.path)
    return render(request, 'guestbook/thanks.html', {'teasers': teasers})