from django.shortcuts import render
from django.core.paginator import Paginator
from django.core.cache import cache
from .models import manga_collection
import hashlib


def manga_catalog(request):
    # Кешируем общее количество (раз в 5 минут)
    total_manga_count = cache.get('total_manga_count')
    if total_manga_count is None:
        total_manga_count = manga_collection.estimated_document_count()
        cache.set('total_manga_count', total_manga_count, 300)

    # Все теги — можно тоже кешировать, но пока оставим
    all_tags = manga_collection.distinct("tags")

    # Получаем выбранные теги
    selected_tags = request.GET.getlist('tags')






    query = {}

    query_key = hashlib.md5(str(query).encode()).hexdigest()
    cache_key = f"count_{query_key}"
    total_filtered = cache.get(cache_key)

    if total_filtered is None:
        total_filtered = manga_collection.count_documents(query)
        cache.set(cache_key, total_filtered, 60)  # на 1 минуту



    """    query = {}
    if selected_tags:
        query['tags'] = {'$all': selected_tags}

    # Считаем количество для пагинации (можно тоже кешировать по хешу, но пока так)
    total_filtered = manga_collection.count_documents(query)"""

    # Получаем номер страницы
    page_number = request.GET.get('page') or 1
    try:
        page_number = int(page_number)
    except (TypeError, ValueError):
        page_number = 1

    per_page = 20
    skip = (page_number - 1) * per_page

    # Получаем только текущую страницу
    manga_cursor = manga_collection.find(query).skip(skip).limit(per_page)
    manga_list = list(manga_cursor)

    # Создаём Paginator и page_obj ПРАВИЛЬНО
    paginator = Paginator(range(total_filtered), per_page)
    page_obj = paginator.get_page(page_number)

    # Передаём данные в шаблон
    return render(request, 'manga_catalog.html', {
        'page_obj': page_obj,
        'manga_list': manga_list,
        'total_manga_count': total_manga_count,
        'all_tags': sorted(all_tags),
        'selected_tags': selected_tags,
    })

def show_manga(request, manga_id):
    manga = manga_collection.find_one({"id": int(manga_id)})
    if not manga:
        return render(request, "not_found.html")
    return render(request, "manga_view.html", {"manga": manga})

def show_manga_page(request, manga_id, page_number):
    manga = manga_collection.find_one({"id": int(manga_id)})
    if not manga or page_number < 1 or page_number > manga['len_manga']:
        return render(request, "not_found.html")

    img_url = manga['imgs_manga'][page_number - 1]
    return render(request, "manga_page.html", {
        "manga": manga,
        "img_url": img_url,
        "page_number": page_number
    })